TY  - JOUR
AU  - Pavlović, Jelena
AU  - Hrenović, Jasna
AU  - Povrenović, Dragan
AU  - Rajić, Nevenka
PY  - 2024
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/7414
AB  - Adsorptive, catalytic, and antibacterial properties of clinoptilolite-rich tuffs (ZT) are presented here. ZT transformed into Fe-containing ZT (Fe-ZT) removes various organic and inorganic anions from water. Fe-ZT, which contains selenium, is beneficial for growing Pleurotus ostreatus mushrooms. The fungi convert inorganic Se from Fe-ZT into a more useful organically bonded form. ZT and Fe-ZT as supplements retain nitrogen and potassium in sandy, silty loam and silty clay soils. ZT shows an affinity toward toxic metal cations, which are essential for cleaning contaminated water. The adsorption of atenolol, acetylsalicylic, and salicylic acid onto M-ZT (M–Cu2+, Mn2+, Ni2+, or Zn2+) from water solutions suggests that both the natures of M and pharmaceuticals have a significant impact on the adsorption mechanism and determine the adsorption capability of the ZT. ZT is an excellent carrier for ultrafine (2–5 nm) nano oxide particles, which have been shown to have catalytic activity in different chemical processes and photodegradation reactions of organic pollutants. ZT can also be transformed into SO4-SnO2-ZT, which is catalytically active as a solid acid. M-ZT is an effective carrier of valuable bacteria. Ag-ZT possesses beneficial bactericidal activity in disinfecting water and soil remediation.
PB  - MDPI
T2  - Materials
T1  - Advances in the Applications of Clinoptilolite-Rich Tuffs
IS  - 6
SP  - 1306
VL  - 17
DO  - 10.3390/ma17061306
ER  - 

@article{
author = "Pavlović, Jelena and Hrenović, Jasna and Povrenović, Dragan and Rajić, Nevenka",
year = "2024",
abstract = "Adsorptive, catalytic, and antibacterial properties of clinoptilolite-rich tuffs (ZT) are presented here. ZT transformed into Fe-containing ZT (Fe-ZT) removes various organic and inorganic anions from water. Fe-ZT, which contains selenium, is beneficial for growing Pleurotus ostreatus mushrooms. The fungi convert inorganic Se from Fe-ZT into a more useful organically bonded form. ZT and Fe-ZT as supplements retain nitrogen and potassium in sandy, silty loam and silty clay soils. ZT shows an affinity toward toxic metal cations, which are essential for cleaning contaminated water. The adsorption of atenolol, acetylsalicylic, and salicylic acid onto M-ZT (M–Cu2+, Mn2+, Ni2+, or Zn2+) from water solutions suggests that both the natures of M and pharmaceuticals have a significant impact on the adsorption mechanism and determine the adsorption capability of the ZT. ZT is an excellent carrier for ultrafine (2–5 nm) nano oxide particles, which have been shown to have catalytic activity in different chemical processes and photodegradation reactions of organic pollutants. ZT can also be transformed into SO4-SnO2-ZT, which is catalytically active as a solid acid. M-ZT is an effective carrier of valuable bacteria. Ag-ZT possesses beneficial bactericidal activity in disinfecting water and soil remediation.",
publisher = "MDPI",
journal = "Materials",
title = "Advances in the Applications of Clinoptilolite-Rich Tuffs",
number = "6",
pages = "1306",
volume = "17",
doi = "10.3390/ma17061306"
}

Pavlović, J., Hrenović, J., Povrenović, D.,& Rajić, N.. (2024). Advances in the Applications of Clinoptilolite-Rich Tuffs. in Materials
MDPI., 17(6), 1306.
https://doi.org/10.3390/ma17061306

Pavlović J, Hrenović J, Povrenović D, Rajić N. Advances in the Applications of Clinoptilolite-Rich Tuffs. in Materials. 2024;17(6):1306.
doi:10.3390/ma17061306 .

Pavlović, Jelena, Hrenović, Jasna, Povrenović, Dragan, Rajić, Nevenka, "Advances in the Applications of Clinoptilolite-Rich Tuffs" in Materials, 17, no. 6 (2024):1306,
https://doi.org/10.3390/ma17061306 . .

TY  - JOUR
AU  - Kumar, Amit
AU  - Škoro, Nikola
AU  - Gernjak, Wolfgang
AU  - Povrenović, Dragan
AU  - Puač, Nevena
PY  - 2022
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5081
AB  - In this work, the direct and indirect removal of Acid Blue 25 (AB25) from water by using cold atmospheric pressure plasma jet (APPJ) has been demonstrated. APPJ with a pin electrode type configuration operating with argon as a working gas was used as a plasma source for treatments. In this configuration, argon plasma was formed in the contact with surrounding air over the liquid surface. The plasma was driven by using a high voltage radio frequency (RF) power supply. The system was characterized by the measurement of electrical characteristics and by employing optical emission spectroscopy (OES). The electrical characterization gave information about the voltages and currents, i.e., working points of the discharge, as well as power deposition to the sample. OES recorded the emission spectra and confirmed several existing reactive species in the gas phase of the plasma system. During the direct treatment, AB25-containing solution was directly exposed to APPJ. The direct treatment was performed by modifying various experimental parameters, such as initial AB25 concentrations, treatment times, and input powers. In the indirect treatment, AB25 was treated by using plasma activated water (PAW). The characterization of PAW was performed and various plasma-induced long-lived species, such as nitrate (NO3−), nitrite (NO2−) and hydrogen peroxide (H2O2) have been quantified using colorimetric techniques. Besides, blank experiments have been conducted with main constituents in PAW, where AB25 was treated individually by NO3−, NO2−, and H2O2 and with a mixture of these three species. As expected, with the direct treatment almost complete removal of AB25 was achieved. The measurements also provided an insight into the kinetics of the degradation of AB25. In the indirect treatment, PAW removed a significant amount of AB25 within 17 days. In the blank experiments, H2O2 containing solutions created a favourable influence on removal of AB25 from liquid.
PB  - Frontiers Media S.A.
T2  - Frontiers in Physics
T1  - Direct and Indirect Treatment of Organic Dye (Acid Blue 25) Solutions by Using Cold Atmospheric Plasma Jet
SP  - 835635
VL  - 10
DO  - 10.3389/fphy.2022.835635
ER  - 

@article{
author = "Kumar, Amit and Škoro, Nikola and Gernjak, Wolfgang and Povrenović, Dragan and Puač, Nevena",
year = "2022",
abstract = "In this work, the direct and indirect removal of Acid Blue 25 (AB25) from water by using cold atmospheric pressure plasma jet (APPJ) has been demonstrated. APPJ with a pin electrode type configuration operating with argon as a working gas was used as a plasma source for treatments. In this configuration, argon plasma was formed in the contact with surrounding air over the liquid surface. The plasma was driven by using a high voltage radio frequency (RF) power supply. The system was characterized by the measurement of electrical characteristics and by employing optical emission spectroscopy (OES). The electrical characterization gave information about the voltages and currents, i.e., working points of the discharge, as well as power deposition to the sample. OES recorded the emission spectra and confirmed several existing reactive species in the gas phase of the plasma system. During the direct treatment, AB25-containing solution was directly exposed to APPJ. The direct treatment was performed by modifying various experimental parameters, such as initial AB25 concentrations, treatment times, and input powers. In the indirect treatment, AB25 was treated by using plasma activated water (PAW). The characterization of PAW was performed and various plasma-induced long-lived species, such as nitrate (NO3−), nitrite (NO2−) and hydrogen peroxide (H2O2) have been quantified using colorimetric techniques. Besides, blank experiments have been conducted with main constituents in PAW, where AB25 was treated individually by NO3−, NO2−, and H2O2 and with a mixture of these three species. As expected, with the direct treatment almost complete removal of AB25 was achieved. The measurements also provided an insight into the kinetics of the degradation of AB25. In the indirect treatment, PAW removed a significant amount of AB25 within 17 days. In the blank experiments, H2O2 containing solutions created a favourable influence on removal of AB25 from liquid.",
publisher = "Frontiers Media S.A.",
journal = "Frontiers in Physics",
title = "Direct and Indirect Treatment of Organic Dye (Acid Blue 25) Solutions by Using Cold Atmospheric Plasma Jet",
pages = "835635",
volume = "10",
doi = "10.3389/fphy.2022.835635"
}

Kumar, A., Škoro, N., Gernjak, W., Povrenović, D.,& Puač, N.. (2022). Direct and Indirect Treatment of Organic Dye (Acid Blue 25) Solutions by Using Cold Atmospheric Plasma Jet. in Frontiers in Physics
Frontiers Media S.A.., 10, 835635.
https://doi.org/10.3389/fphy.2022.835635

Kumar A, Škoro N, Gernjak W, Povrenović D, Puač N. Direct and Indirect Treatment of Organic Dye (Acid Blue 25) Solutions by Using Cold Atmospheric Plasma Jet. in Frontiers in Physics. 2022;10:835635.
doi:10.3389/fphy.2022.835635 .

Kumar, Amit, Škoro, Nikola, Gernjak, Wolfgang, Povrenović, Dragan, Puač, Nevena, "Direct and Indirect Treatment of Organic Dye (Acid Blue 25) Solutions by Using Cold Atmospheric Plasma Jet" in Frontiers in Physics, 10 (2022):835635,
https://doi.org/10.3389/fphy.2022.835635 . .

Jovanović, A., Kovačina, J. N., Marinković, A., Onjia, A., Povrenović, D.,& Trišović, T.. (2019). Optimizacija procesa prečišćavanja otpadnih voda iz Fabrike streljačke municije Uzići. 
University of Belgrade, Faculty of Technology and Metallurgy..
https://hdl.handle.net/21.15107/rcub_technorep_4176

Jovanović A, Kovačina JN, Marinković A, Onjia A, Povrenović D, Trišović T. Optimizacija procesa prečišćavanja otpadnih voda iz Fabrike streljačke municije Uzići. 2019;.
https://hdl.handle.net/21.15107/rcub_technorep_4176 .

Jovanović, Aleksandar, Kovačina, Jovanka N., Marinković, Aleksandar, Onjia, Antonije, Povrenović, Dragan, Trišović, Tomislav, "Optimizacija procesa prečišćavanja otpadnih voda iz Fabrike streljačke municije Uzići" (2019),
https://hdl.handle.net/21.15107/rcub_technorep_4176 .

TY  - CONF
AU  - Kovačina, Jovanka N.
AU  - Milošević, Milena D.
AU  - Božić, Aleksandra R.
AU  - Jovanović, Aleksandar
AU  - Marinković, Aleksandar
AU  - Onjia, Antonije
AU  - Povrenović, Dragan
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4171
AB  - Due to the development of industry and population growth during the in recent years, there are problems with wastewater from production that needs to be addressed in an environmentally and economical way. All wastewaters from industry, no matter how they are created, contain harmful substances that may have some degree of toxicity, must be treated if their quality does not meet the legal requirements. The purpose of wastewater treatment is to remove harmful substances, thereby reducing its pollution level, and at the same time, it also has a certain economic and environmental effect. Therefore, wastewater treatment was carried out in this work by precipitation using calcium oxide to remove colloidal substances and heavy metals. Most pollutants are of organic origin and their removal will be carried in this work out using advanced oxidation processes using ozone, and ozone in combination with ultrasound to achieve water quality that complies with the law. The purification process will be optimized with respect to, method, time and amount of oxidizing agent applied. The degree of pollution of water by organic compounds will be determined on the basis of measurements of HPK, BOD and the concentration of heavy metals (lead, ferrum, chromium, copper, zinc, aluminum).
AB  - Usled razvoja industrije i rastom populacije tokom poslednjih godina javljaju se problemi u vezi sa otpadnim vodama iz proizvodnje koje je neophodno rešavati na ekološki i ekonomičan način. Sve otpadne vode iz postrojenja bez obzira kako su nastale sadrže štetne materije koje mogu da imaju i određen stepen toksičnih primesa, moraju se prečistiti ako njihov kvalitet ne odgovara zakonskim okvirima. Svrha tretmana otpadnih voda je uklanjanje štetnih materija čime se postiže smanjnje stepena njene zagađenosti, a istovremeno se ostvaruje i određen ekonomski i ekološki efekat, stoga je u ovom radu izvršeno prečišćavanje otpadne vode postupkom taloženja upotrebom kalcijum-oksida u cilju uklanjanja koloidnih materija i teških metala. Većina zagađujućih materija su organskog porekla i njihovo ukljanjanje vršiće se primenom naprednih oksidacionih procesa korišćenjem ozona i ozona u kombinaciji sa ultrazvukom u cilju postizanja kvaliteta vode koji odgovara zakonskoj regulativi. Proces prečišćavanja će se optimizovati u odnosu na tehnološki postupak, koncentraciju, vreme tretmana i količinu primenjenog oksidacionog sredstva. Stepen zagađenosti vode organskim jedinjenjima će se određivati na osnovu merenja HPK, BPK i koncentracije teških metala (olovo, gvožđe, hrom, bakar, cink, aluminijum).
PB  - Beograd : Beogradska politehnika
C3  - Zbornik radova - Peti naučno-stručni skup politehnika
T1  - Purification of waste water using ozonization
T1  - Prečišćavanje otpadnih voda primenom ozonizacije
EP  - 147
SP  - 142
UR  - https://hdl.handle.net/21.15107/rcub_technorep_4171
ER  - 

@conference{
author = "Kovačina, Jovanka N. and Milošević, Milena D. and Božić, Aleksandra R. and Jovanović, Aleksandar and Marinković, Aleksandar and Onjia, Antonije and Povrenović, Dragan",
year = "2019",
abstract = "Due to the development of industry and population growth during the in recent years, there are problems with wastewater from production that needs to be addressed in an environmentally and economical way. All wastewaters from industry, no matter how they are created, contain harmful substances that may have some degree of toxicity, must be treated if their quality does not meet the legal requirements. The purpose of wastewater treatment is to remove harmful substances, thereby reducing its pollution level, and at the same time, it also has a certain economic and environmental effect. Therefore, wastewater treatment was carried out in this work by precipitation using calcium oxide to remove colloidal substances and heavy metals. Most pollutants are of organic origin and their removal will be carried in this work out using advanced oxidation processes using ozone, and ozone in combination with ultrasound to achieve water quality that complies with the law. The purification process will be optimized with respect to, method, time and amount of oxidizing agent applied. The degree of pollution of water by organic compounds will be determined on the basis of measurements of HPK, BOD and the concentration of heavy metals (lead, ferrum, chromium, copper, zinc, aluminum)., Usled razvoja industrije i rastom populacije tokom poslednjih godina javljaju se problemi u vezi sa otpadnim vodama iz proizvodnje koje je neophodno rešavati na ekološki i ekonomičan način. Sve otpadne vode iz postrojenja bez obzira kako su nastale sadrže štetne materije koje mogu da imaju i određen stepen toksičnih primesa, moraju se prečistiti ako njihov kvalitet ne odgovara zakonskim okvirima. Svrha tretmana otpadnih voda je uklanjanje štetnih materija čime se postiže smanjnje stepena njene zagađenosti, a istovremeno se ostvaruje i određen ekonomski i ekološki efekat, stoga je u ovom radu izvršeno prečišćavanje otpadne vode postupkom taloženja upotrebom kalcijum-oksida u cilju uklanjanja koloidnih materija i teških metala. Većina zagađujućih materija su organskog porekla i njihovo ukljanjanje vršiće se primenom naprednih oksidacionih procesa korišćenjem ozona i ozona u kombinaciji sa ultrazvukom u cilju postizanja kvaliteta vode koji odgovara zakonskoj regulativi. Proces prečišćavanja će se optimizovati u odnosu na tehnološki postupak, koncentraciju, vreme tretmana i količinu primenjenog oksidacionog sredstva. Stepen zagađenosti vode organskim jedinjenjima će se određivati na osnovu merenja HPK, BPK i koncentracije teških metala (olovo, gvožđe, hrom, bakar, cink, aluminijum).",
publisher = "Beograd : Beogradska politehnika",
journal = "Zbornik radova - Peti naučno-stručni skup politehnika",
title = "Purification of waste water using ozonization, Prečišćavanje otpadnih voda primenom ozonizacije",
pages = "147-142",
url = "https://hdl.handle.net/21.15107/rcub_technorep_4171"
}

Kovačina, J. N., Milošević, M. D., Božić, A. R., Jovanović, A., Marinković, A., Onjia, A.,& Povrenović, D.. (2019). Purification of waste water using ozonization. in Zbornik radova - Peti naučno-stručni skup politehnika
Beograd : Beogradska politehnika., 142-147.
https://hdl.handle.net/21.15107/rcub_technorep_4171

Kovačina JN, Milošević MD, Božić AR, Jovanović A, Marinković A, Onjia A, Povrenović D. Purification of waste water using ozonization. in Zbornik radova - Peti naučno-stručni skup politehnika. 2019;:142-147.
https://hdl.handle.net/21.15107/rcub_technorep_4171 .

Kovačina, Jovanka N., Milošević, Milena D., Božić, Aleksandra R., Jovanović, Aleksandar, Marinković, Aleksandar, Onjia, Antonije, Povrenović, Dragan, "Purification of waste water using ozonization" in Zbornik radova - Peti naučno-stručni skup politehnika (2019):142-147,
https://hdl.handle.net/21.15107/rcub_technorep_4171 .

TY  - JOUR
AU  - Popović, Ana
AU  - Milicević, Sonja
AU  - Milosević, Vladan
AU  - Ivošević, Branislav
AU  - Carapić, Jelena
AU  - Jovanović, Vladimir
AU  - Povrenović, Dragan
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4154
AB  - Industrial wastewater contains recalcitrant organic compounds with a very complex chemical structure, built of molecules with long chains of carbon atoms and attached different functional groups. Chemical or biological treatments used for removal of these compounds are being replaced with more efficient non-commercial wastewater treatments. Advanced oxidation processes overcome limitations of conventional methods regarding formation of by-products during degradation of recalcitrant organic compounds. The Fenton process, or use of the Fenton's reagent, has became one of the most utilized processes due to simplicity, economy and accessible amounts of ferrous iron and hydrogen-peroxide, which are used in the process. In specific, the Fenton's reagent is a catalytic-oxidative mixture of these two components. The ferrous iron Fe2+ initiates and catalyzes decomposition of H2O2, resulting in generation of hydroxyl radicals, which are the main radical species in the process able to detoxify several organic pollutants by oxidation. In addition, other mechanisms besides formation of hydroxyl radicals may occur during the Fenton process and participate in degradation of target pollutants. Generally, the treatment efficiency relies upon the physical and chemical properties of target pollutants and the process operating conditions. The main disadvantage of the Fenton process is production of sludge formed by iron hydroxide at certain pH values. An alternative solution for this problem is application of this process in fluidized bed reactors. This paper presents an overview of Fenton and photo-Fenton processes in dispersed systems for removal of different industrial wastewater pollutants. The most important process parameters, required for efficient degradation of recalcitrant organic compounds are also described, such as the catalyst type, pH value, temperature, H2O2 concentration and retention time. Strict control of Fenton process parameters in fluidized bed reactors at desired values can bring these systems to the commercial use.
PB  - Savez hemijskih inženjera, Beograd
T2  - Hemijska industrija
T1  - Fenton process in dispersed systems for industrial wastewater treatment
EP  - 62
IS  - 1
SP  - 47
VL  - 73
DO  - 10.2298/HEMIND181019005P
ER  - 

@article{
author = "Popović, Ana and Milicević, Sonja and Milosević, Vladan and Ivošević, Branislav and Carapić, Jelena and Jovanović, Vladimir and Povrenović, Dragan",
year = "2019",
abstract = "Industrial wastewater contains recalcitrant organic compounds with a very complex chemical structure, built of molecules with long chains of carbon atoms and attached different functional groups. Chemical or biological treatments used for removal of these compounds are being replaced with more efficient non-commercial wastewater treatments. Advanced oxidation processes overcome limitations of conventional methods regarding formation of by-products during degradation of recalcitrant organic compounds. The Fenton process, or use of the Fenton's reagent, has became one of the most utilized processes due to simplicity, economy and accessible amounts of ferrous iron and hydrogen-peroxide, which are used in the process. In specific, the Fenton's reagent is a catalytic-oxidative mixture of these two components. The ferrous iron Fe2+ initiates and catalyzes decomposition of H2O2, resulting in generation of hydroxyl radicals, which are the main radical species in the process able to detoxify several organic pollutants by oxidation. In addition, other mechanisms besides formation of hydroxyl radicals may occur during the Fenton process and participate in degradation of target pollutants. Generally, the treatment efficiency relies upon the physical and chemical properties of target pollutants and the process operating conditions. The main disadvantage of the Fenton process is production of sludge formed by iron hydroxide at certain pH values. An alternative solution for this problem is application of this process in fluidized bed reactors. This paper presents an overview of Fenton and photo-Fenton processes in dispersed systems for removal of different industrial wastewater pollutants. The most important process parameters, required for efficient degradation of recalcitrant organic compounds are also described, such as the catalyst type, pH value, temperature, H2O2 concentration and retention time. Strict control of Fenton process parameters in fluidized bed reactors at desired values can bring these systems to the commercial use.",
publisher = "Savez hemijskih inženjera, Beograd",
journal = "Hemijska industrija",
title = "Fenton process in dispersed systems for industrial wastewater treatment",
pages = "62-47",
number = "1",
volume = "73",
doi = "10.2298/HEMIND181019005P"
}

Popović, A., Milicević, S., Milosević, V., Ivošević, B., Carapić, J., Jovanović, V.,& Povrenović, D.. (2019). Fenton process in dispersed systems for industrial wastewater treatment. in Hemijska industrija
Savez hemijskih inženjera, Beograd., 73(1), 47-62.
https://doi.org/10.2298/HEMIND181019005P

Popović A, Milicević S, Milosević V, Ivošević B, Carapić J, Jovanović V, Povrenović D. Fenton process in dispersed systems for industrial wastewater treatment. in Hemijska industrija. 2019;73(1):47-62.
doi:10.2298/HEMIND181019005P .

Popović, Ana, Milicević, Sonja, Milosević, Vladan, Ivošević, Branislav, Carapić, Jelena, Jovanović, Vladimir, Povrenović, Dragan, "Fenton process in dispersed systems for industrial wastewater treatment" in Hemijska industrija, 73, no. 1 (2019):47-62,
https://doi.org/10.2298/HEMIND181019005P . .

TY  - JOUR
AU  - Urosević, Tijana
AU  - Povrenović, Dragan
AU  - Vukosavljević, Predrag
AU  - Urosević, Ivan
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3897
AB  - In this paper, the influence of operating parameters (transmembrane pressure, temperature, the flow rate of retentate) on the cross - flow microfiltration of synthetic fruit juice and periodic backwashing with air was examined. In the experiments, the Kerasep W5 ceramic membrane with a separation limit of 0.2 mu m was used. The results of experiments in which different transmembrane pressures were used showed that stationary fluxes, at stationary conditions, after 60 minutes, have similar values. So, it can be concluded that the value of the driving force is irrelevant at steady state conditions. However, until the steady state conditions are established, a positive effect of the increase in the driving force is opposed to the negative effect of the increased polarization resistance, as a result of the driving force increase. Thus, the optimal transmembrane pressure was determined amounting to 2 bars. The optimum temperature of the process of clearing the fruit juices by microfiltration is reported as 55 degrees C. Higher temperatures are not used due to a degrading effect on the chemical composition of the juice and a long microfiltration process. With an increase in the temperature of retentate from 22 degrees C to 55 degrees C, the permeate flux increased up to 60 %. Increasing the flow rate of retentate reduces the thickness of the formed layer on the surface of the membrane. Due to limitations of the experimental setup and the large surface area of the membrane, the specific velocity of the retentate was low, so that the effects of cross-flow filtration were absent. The use of cross-flow filtration is one of the main requirements for increasing permeate flux, but in the present case it was in overall insufficient, so we have applied periodic air backwashing for improving fruit juice flux during membrane clarification. With this technique, the deposited layer on the membrane is lifted and the permeate flux is maintained at high levels preventing establishment of the steady state in the low flux zone. The time spent for the periodic backwashing was low as compared to the benefits of the increase in the collected permeate quantity. In all experiments with periodic backwashing with air, the collected permeate quantity is higher for up to 72.5 % as compared to experiments without backwashing. By increasing the backwashing duration, the flux increase is up to 5 %, which can be significant for microfiltration at industrial scale. Therefore, this technique is certainly recommended for microfiltration in the production of fruit juices.
PB  - Savez hemijskih inženjera, Beograd
T2  - Hemijska industrija
T1  - Microfiltration with periodic gas backwashing as an alternative technique for increasing permeate flux
EP  - 68
IS  - 2
SP  - 59
VL  - 72
DO  - 10.2298/HEMIND170814021U
ER  - 

@article{
author = "Urosević, Tijana and Povrenović, Dragan and Vukosavljević, Predrag and Urosević, Ivan",
year = "2018",
abstract = "In this paper, the influence of operating parameters (transmembrane pressure, temperature, the flow rate of retentate) on the cross - flow microfiltration of synthetic fruit juice and periodic backwashing with air was examined. In the experiments, the Kerasep W5 ceramic membrane with a separation limit of 0.2 mu m was used. The results of experiments in which different transmembrane pressures were used showed that stationary fluxes, at stationary conditions, after 60 minutes, have similar values. So, it can be concluded that the value of the driving force is irrelevant at steady state conditions. However, until the steady state conditions are established, a positive effect of the increase in the driving force is opposed to the negative effect of the increased polarization resistance, as a result of the driving force increase. Thus, the optimal transmembrane pressure was determined amounting to 2 bars. The optimum temperature of the process of clearing the fruit juices by microfiltration is reported as 55 degrees C. Higher temperatures are not used due to a degrading effect on the chemical composition of the juice and a long microfiltration process. With an increase in the temperature of retentate from 22 degrees C to 55 degrees C, the permeate flux increased up to 60 %. Increasing the flow rate of retentate reduces the thickness of the formed layer on the surface of the membrane. Due to limitations of the experimental setup and the large surface area of the membrane, the specific velocity of the retentate was low, so that the effects of cross-flow filtration were absent. The use of cross-flow filtration is one of the main requirements for increasing permeate flux, but in the present case it was in overall insufficient, so we have applied periodic air backwashing for improving fruit juice flux during membrane clarification. With this technique, the deposited layer on the membrane is lifted and the permeate flux is maintained at high levels preventing establishment of the steady state in the low flux zone. The time spent for the periodic backwashing was low as compared to the benefits of the increase in the collected permeate quantity. In all experiments with periodic backwashing with air, the collected permeate quantity is higher for up to 72.5 % as compared to experiments without backwashing. By increasing the backwashing duration, the flux increase is up to 5 %, which can be significant for microfiltration at industrial scale. Therefore, this technique is certainly recommended for microfiltration in the production of fruit juices.",
publisher = "Savez hemijskih inženjera, Beograd",
journal = "Hemijska industrija",
title = "Microfiltration with periodic gas backwashing as an alternative technique for increasing permeate flux",
pages = "68-59",
number = "2",
volume = "72",
doi = "10.2298/HEMIND170814021U"
}

Urosević, T., Povrenović, D., Vukosavljević, P.,& Urosević, I.. (2018). Microfiltration with periodic gas backwashing as an alternative technique for increasing permeate flux. in Hemijska industrija
Savez hemijskih inženjera, Beograd., 72(2), 59-68.
https://doi.org/10.2298/HEMIND170814021U

Urosević T, Povrenović D, Vukosavljević P, Urosević I. Microfiltration with periodic gas backwashing as an alternative technique for increasing permeate flux. in Hemijska industrija. 2018;72(2):59-68.
doi:10.2298/HEMIND170814021U .

Urosević, Tijana, Povrenović, Dragan, Vukosavljević, Predrag, Urosević, Ivan, "Microfiltration with periodic gas backwashing as an alternative technique for increasing permeate flux" in Hemijska industrija, 72, no. 2 (2018):59-68,
https://doi.org/10.2298/HEMIND170814021U . .

TY  - JOUR
AU  - Milicević, Sonja
AU  - Martinović, Sanja
AU  - Milosević, Vladan
AU  - Stojanović, Jovica
AU  - Povrenović, Dragan
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3944
AB  - Systematic modification of three structurally different minerals (zeolite, mica, and vermiculite) was carried out with the aim of determining the modification mechanism and exposing the hydrophobic surface that can be used as a sorbent for many organic compounds. Mechanism of modification with cationic surfactant depends strongly on the mineral type. In order to identify the influence of aluminosilicates structural differences on the modification process, adsorption experiments with organic matter and water vapor, supplemented with the DTA/TG analysis, were performed. The cation exchange capacity (CEC) value was 1454 gt 560 gt 28meqkg(-1) for zeolite (clinoptilolite), vermiculite, and mica (muscovite), respectively. Despite its CEC value, vermiculite adsorbed three times the amount of organic matter than did clinoptilolite due to the porous structure of zeolite, which acted to limit the adsorption only on the external exchangeable cations. If the loading amount is equal to the CEC or the external cation exchange capacity for clinoptilolite (ECEC approximate to 10% CEC), the monolayer will form while mineral surface will have hydrophobic character. Only one active center exists at the surface of the clinoptilolite that was identified by DTA curves with a sharp and defined peak around 300 degrees C and by the mass loss at the TG diagrams. Two significant and equal active centers were observed in vermiculite, one for the exchange of the surface cations and the other for the interlayer cations and H2O molecules. Muscovite CEC is negligible, and due to the absence of any other functional groups, the modification of this mineral was impossible.
PB  - Springer, Dordrecht
T2  - Journal of Thermal Analysis and Calorimetry
T1  - Differences in coating mechanism of structurally different aluminosilicates observed through the thermal analysis
EP  - 1019
IS  - 2
SP  - 1011
VL  - 134
DO  - 10.1007/s10973-018-7351-3
ER  - 

@article{
author = "Milicević, Sonja and Martinović, Sanja and Milosević, Vladan and Stojanović, Jovica and Povrenović, Dragan",
year = "2018",
abstract = "Systematic modification of three structurally different minerals (zeolite, mica, and vermiculite) was carried out with the aim of determining the modification mechanism and exposing the hydrophobic surface that can be used as a sorbent for many organic compounds. Mechanism of modification with cationic surfactant depends strongly on the mineral type. In order to identify the influence of aluminosilicates structural differences on the modification process, adsorption experiments with organic matter and water vapor, supplemented with the DTA/TG analysis, were performed. The cation exchange capacity (CEC) value was 1454 gt 560 gt 28meqkg(-1) for zeolite (clinoptilolite), vermiculite, and mica (muscovite), respectively. Despite its CEC value, vermiculite adsorbed three times the amount of organic matter than did clinoptilolite due to the porous structure of zeolite, which acted to limit the adsorption only on the external exchangeable cations. If the loading amount is equal to the CEC or the external cation exchange capacity for clinoptilolite (ECEC approximate to 10% CEC), the monolayer will form while mineral surface will have hydrophobic character. Only one active center exists at the surface of the clinoptilolite that was identified by DTA curves with a sharp and defined peak around 300 degrees C and by the mass loss at the TG diagrams. Two significant and equal active centers were observed in vermiculite, one for the exchange of the surface cations and the other for the interlayer cations and H2O molecules. Muscovite CEC is negligible, and due to the absence of any other functional groups, the modification of this mineral was impossible.",
publisher = "Springer, Dordrecht",
journal = "Journal of Thermal Analysis and Calorimetry",
title = "Differences in coating mechanism of structurally different aluminosilicates observed through the thermal analysis",
pages = "1019-1011",
number = "2",
volume = "134",
doi = "10.1007/s10973-018-7351-3"
}

Milicević, S., Martinović, S., Milosević, V., Stojanović, J.,& Povrenović, D.. (2018). Differences in coating mechanism of structurally different aluminosilicates observed through the thermal analysis. in Journal of Thermal Analysis and Calorimetry
Springer, Dordrecht., 134(2), 1011-1019.
https://doi.org/10.1007/s10973-018-7351-3

Milicević S, Martinović S, Milosević V, Stojanović J, Povrenović D. Differences in coating mechanism of structurally different aluminosilicates observed through the thermal analysis. in Journal of Thermal Analysis and Calorimetry. 2018;134(2):1011-1019.
doi:10.1007/s10973-018-7351-3 .

Milicević, Sonja, Martinović, Sanja, Milosević, Vladan, Stojanović, Jovica, Povrenović, Dragan, "Differences in coating mechanism of structurally different aluminosilicates observed through the thermal analysis" in Journal of Thermal Analysis and Calorimetry, 134, no. 2 (2018):1011-1019,
https://doi.org/10.1007/s10973-018-7351-3 . .

TY  - JOUR
AU  - Povrenović, Dragan
AU  - Popović, Ana
AU  - Milićević, Sonja
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3819
AB  - U ovom radu je analiziran rad istostrujnog fontanskog sloja sa centralnom cevi u sistemu čvrste čestice-voda. Eksperimenti su realizovani na polukoloni prečnika 196 mm, ukupne visine 860 mm, sa koničnim dnom ugla 110o . Mlaznica prečnika 20 mm je bila centralno postavljena, sa mogućnošću pomeranja vrha mlaznice ka početku centralne cevi, prečnika 25 mm. Kao ispuna kolone korišćene su staklene kuglice i granule PET-a, odnosno polietilena. Osnovni cilj rada je bio utvrđivanje fluido-mehaničkih parametara pri kojima je moguće formirati fontanski sloj kod koga bi jedan udeo čestica u anulusu bio potpuno potopljen u vodi, a gornji sloj čestica bi mogao biti u kontaktu sa vazduhom. Potencijalna primena ovakvih sistema bi mogla biti u procesima aeracije, odnosno degazacije vode.
PB  - Udruženje za tehnologiju vode i sanitarno inžinjerstvo, Beograd
T2  - Voda i sanitarna tehnika
T1  - Fluido-mehaničke karakteristike istostrujnog fontanskog sloja
EP  - 44
IS  - 2
SP  - 37
VL  - 48
UR  - https://hdl.handle.net/21.15107/rcub_technorep_3819
ER  - 

@article{
author = "Povrenović, Dragan and Popović, Ana and Milićević, Sonja",
year = "2018",
abstract = "U ovom radu je analiziran rad istostrujnog fontanskog sloja sa centralnom cevi u sistemu čvrste čestice-voda. Eksperimenti su realizovani na polukoloni prečnika 196 mm, ukupne visine 860 mm, sa koničnim dnom ugla 110o . Mlaznica prečnika 20 mm je bila centralno postavljena, sa mogućnošću pomeranja vrha mlaznice ka početku centralne cevi, prečnika 25 mm. Kao ispuna kolone korišćene su staklene kuglice i granule PET-a, odnosno polietilena. Osnovni cilj rada je bio utvrđivanje fluido-mehaničkih parametara pri kojima je moguće formirati fontanski sloj kod koga bi jedan udeo čestica u anulusu bio potpuno potopljen u vodi, a gornji sloj čestica bi mogao biti u kontaktu sa vazduhom. Potencijalna primena ovakvih sistema bi mogla biti u procesima aeracije, odnosno degazacije vode.",
publisher = "Udruženje za tehnologiju vode i sanitarno inžinjerstvo, Beograd",
journal = "Voda i sanitarna tehnika",
title = "Fluido-mehaničke karakteristike istostrujnog fontanskog sloja",
pages = "44-37",
number = "2",
volume = "48",
url = "https://hdl.handle.net/21.15107/rcub_technorep_3819"
}

Povrenović, D., Popović, A.,& Milićević, S.. (2018). Fluido-mehaničke karakteristike istostrujnog fontanskog sloja. in Voda i sanitarna tehnika
Udruženje za tehnologiju vode i sanitarno inžinjerstvo, Beograd., 48(2), 37-44.
https://hdl.handle.net/21.15107/rcub_technorep_3819

Povrenović D, Popović A, Milićević S. Fluido-mehaničke karakteristike istostrujnog fontanskog sloja. in Voda i sanitarna tehnika. 2018;48(2):37-44.
https://hdl.handle.net/21.15107/rcub_technorep_3819 .

Povrenović, Dragan, Popović, Ana, Milićević, Sonja, "Fluido-mehaničke karakteristike istostrujnog fontanskog sloja" in Voda i sanitarna tehnika, 48, no. 2 (2018):37-44,
https://hdl.handle.net/21.15107/rcub_technorep_3819 .

TY  - JOUR
AU  - Tešan-Tomić, Neda
AU  - Smiljanić, Slavko N.
AU  - Jović, Mihajlo D.
AU  - Gligorić, Miladin J.
AU  - Povrenović, Dragan
AU  - Došić, Aleksandar D.
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3857
AB  - This paper presents the results of determining the pseudo-total concentration of five heavy metals in the soil on which the destruction of ammunition, mines, and explosive devices is carried out by the method of open detonation. In the analyzed area, the concentrations of cadmium, lead, nickel, copper, and zinc were determined, while from the physical properties of the soil were determined the granulometric composition and the pH. The aim of the study is to determine the origin and total load on heavy metals and, based on that, to assess the dangers and impact of the site in terms of the soil pollution by heavy metals. In accordance with the regulations of Bosnia and Herzegovina, the results of the soil testing showed a significant load of copper (up to seven times) and cadmium (up to six times), and exceeding the allowed values for nickel and zinc in some places. Lead was the only metal whose concentration was within the maximum allowed and according to that the soil was classified as unpolluted. A sample of soil from the edge of the pit is the only sample in which all heavy metals, except Ni, were within the maximum allowable concentration. In regard to the concentration of the examined metals, the soil of the pit is classified as medium polluted from the aspect of copper, cadmium, and nickel and highly contaminated with zinc. The concentrations of copper and zinc in the examination area correspond to contaminated soil that represents ecological risk, which requires soil remediation.
PB  - Springer International Publishing Ag, Cham
T2  - Water Air and Soil Pollution
T1  - Examining the Effects of the Destroying Ammunition, Mines, and Explosive Devices on the Presence of Heavy Metals in Soil of Open Detonation Pit: Part 1-Pseudo-total Concentration
IS  - 9
VL  - 229
DO  - 10.1007/s11270-018-3957-0
ER  - 

@article{
author = "Tešan-Tomić, Neda and Smiljanić, Slavko N. and Jović, Mihajlo D. and Gligorić, Miladin J. and Povrenović, Dragan and Došić, Aleksandar D.",
year = "2018",
abstract = "This paper presents the results of determining the pseudo-total concentration of five heavy metals in the soil on which the destruction of ammunition, mines, and explosive devices is carried out by the method of open detonation. In the analyzed area, the concentrations of cadmium, lead, nickel, copper, and zinc were determined, while from the physical properties of the soil were determined the granulometric composition and the pH. The aim of the study is to determine the origin and total load on heavy metals and, based on that, to assess the dangers and impact of the site in terms of the soil pollution by heavy metals. In accordance with the regulations of Bosnia and Herzegovina, the results of the soil testing showed a significant load of copper (up to seven times) and cadmium (up to six times), and exceeding the allowed values for nickel and zinc in some places. Lead was the only metal whose concentration was within the maximum allowed and according to that the soil was classified as unpolluted. A sample of soil from the edge of the pit is the only sample in which all heavy metals, except Ni, were within the maximum allowable concentration. In regard to the concentration of the examined metals, the soil of the pit is classified as medium polluted from the aspect of copper, cadmium, and nickel and highly contaminated with zinc. The concentrations of copper and zinc in the examination area correspond to contaminated soil that represents ecological risk, which requires soil remediation.",
publisher = "Springer International Publishing Ag, Cham",
journal = "Water Air and Soil Pollution",
title = "Examining the Effects of the Destroying Ammunition, Mines, and Explosive Devices on the Presence of Heavy Metals in Soil of Open Detonation Pit: Part 1-Pseudo-total Concentration",
number = "9",
volume = "229",
doi = "10.1007/s11270-018-3957-0"
}

Tešan-Tomić, N., Smiljanić, S. N., Jović, M. D., Gligorić, M. J., Povrenović, D.,& Došić, A. D.. (2018). Examining the Effects of the Destroying Ammunition, Mines, and Explosive Devices on the Presence of Heavy Metals in Soil of Open Detonation Pit: Part 1-Pseudo-total Concentration. in Water Air and Soil Pollution
Springer International Publishing Ag, Cham., 229(9).
https://doi.org/10.1007/s11270-018-3957-0

Tešan-Tomić N, Smiljanić SN, Jović MD, Gligorić MJ, Povrenović D, Došić AD. Examining the Effects of the Destroying Ammunition, Mines, and Explosive Devices on the Presence of Heavy Metals in Soil of Open Detonation Pit: Part 1-Pseudo-total Concentration. in Water Air and Soil Pollution. 2018;229(9).
doi:10.1007/s11270-018-3957-0 .

Tešan-Tomić, Neda, Smiljanić, Slavko N., Jović, Mihajlo D., Gligorić, Miladin J., Povrenović, Dragan, Došić, Aleksandar D., "Examining the Effects of the Destroying Ammunition, Mines, and Explosive Devices on the Presence of Heavy Metals in Soil of Open Detonation Pit: Part 1-Pseudo-total Concentration" in Water Air and Soil Pollution, 229, no. 9 (2018),
https://doi.org/10.1007/s11270-018-3957-0 . .

TY  - JOUR
AU  - Tešan-Tomić, Neda
AU  - Smiljanić, Slavko N.
AU  - Jović, Mihajlo D.
AU  - Gligorić, Miladin J.
AU  - Povrenović, Dragan
AU  - Došić, Aleksandar D.
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3854
AB  - As a result of the destruction of ammunition, mines, and explosive devices by the method of open detonation, the increased concentration of heavy metals is often recorded in the soil of military polygons, which is a serious ecological problem. However, in order to determine the potential risk of such locations to the environment, it is necessary to determine, in addition to the total content, the forms in which the metals are present. In this paper, a sequential extraction method was used to analyze the six fractions of five heavy metals (cadmium, lead, nickel, copper, and zinc) in the soil of the polygon for destruction of ammunition, mines, and explosive devices. Samples were collected from the place of direct detonation (so-called pits) and from the edge of the pit. The aim of this research is determination of metal speciation in order to obtain a better insight in their mobility and risk arising from this. The results showed that heavy metals are predominantly present in the residual, oxide, and organic fractions. Cd and Cu were also significantly present in the mobile fractions due to conducted activities on the polygon. To assess the potential environmental risk of soil, the risk assessment code (RAC) and individual (ICF) and global (GCF) contamination factors were used. According to the RAC, the mobility and bioavailability of the analyzed heavy metals decreases in the following order: Cd  gt  Cu  gt  Zn  gt  Pb  gt  Ni. ICF results show low to moderate risk, while GCF results show low risk in terms of heavy metal contamination in the examined area.
PB  - Springer International Publishing Ag, Cham
T2  - Water Air and Soil Pollution
T1  - Examining the Effects of the Destroying Ammunition, Mines and Explosive Devices on the Presence of Heavy Metals in Soil of Open Detonation Pit; Part 2: Determination of Heavy Metal Fractions
IS  - 9
VL  - 229
DO  - 10.1007/s11270-018-3950-7
ER  - 

@article{
author = "Tešan-Tomić, Neda and Smiljanić, Slavko N. and Jović, Mihajlo D. and Gligorić, Miladin J. and Povrenović, Dragan and Došić, Aleksandar D.",
year = "2018",
abstract = "As a result of the destruction of ammunition, mines, and explosive devices by the method of open detonation, the increased concentration of heavy metals is often recorded in the soil of military polygons, which is a serious ecological problem. However, in order to determine the potential risk of such locations to the environment, it is necessary to determine, in addition to the total content, the forms in which the metals are present. In this paper, a sequential extraction method was used to analyze the six fractions of five heavy metals (cadmium, lead, nickel, copper, and zinc) in the soil of the polygon for destruction of ammunition, mines, and explosive devices. Samples were collected from the place of direct detonation (so-called pits) and from the edge of the pit. The aim of this research is determination of metal speciation in order to obtain a better insight in their mobility and risk arising from this. The results showed that heavy metals are predominantly present in the residual, oxide, and organic fractions. Cd and Cu were also significantly present in the mobile fractions due to conducted activities on the polygon. To assess the potential environmental risk of soil, the risk assessment code (RAC) and individual (ICF) and global (GCF) contamination factors were used. According to the RAC, the mobility and bioavailability of the analyzed heavy metals decreases in the following order: Cd  gt  Cu  gt  Zn  gt  Pb  gt  Ni. ICF results show low to moderate risk, while GCF results show low risk in terms of heavy metal contamination in the examined area.",
publisher = "Springer International Publishing Ag, Cham",
journal = "Water Air and Soil Pollution",
title = "Examining the Effects of the Destroying Ammunition, Mines and Explosive Devices on the Presence of Heavy Metals in Soil of Open Detonation Pit; Part 2: Determination of Heavy Metal Fractions",
number = "9",
volume = "229",
doi = "10.1007/s11270-018-3950-7"
}

Tešan-Tomić, N., Smiljanić, S. N., Jović, M. D., Gligorić, M. J., Povrenović, D.,& Došić, A. D.. (2018). Examining the Effects of the Destroying Ammunition, Mines and Explosive Devices on the Presence of Heavy Metals in Soil of Open Detonation Pit; Part 2: Determination of Heavy Metal Fractions. in Water Air and Soil Pollution
Springer International Publishing Ag, Cham., 229(9).
https://doi.org/10.1007/s11270-018-3950-7

Tešan-Tomić N, Smiljanić SN, Jović MD, Gligorić MJ, Povrenović D, Došić AD. Examining the Effects of the Destroying Ammunition, Mines and Explosive Devices on the Presence of Heavy Metals in Soil of Open Detonation Pit; Part 2: Determination of Heavy Metal Fractions. in Water Air and Soil Pollution. 2018;229(9).
doi:10.1007/s11270-018-3950-7 .

Tešan-Tomić, Neda, Smiljanić, Slavko N., Jović, Mihajlo D., Gligorić, Miladin J., Povrenović, Dragan, Došić, Aleksandar D., "Examining the Effects of the Destroying Ammunition, Mines and Explosive Devices on the Presence of Heavy Metals in Soil of Open Detonation Pit; Part 2: Determination of Heavy Metal Fractions" in Water Air and Soil Pollution, 229, no. 9 (2018),
https://doi.org/10.1007/s11270-018-3950-7 . .

TY  - JOUR
AU  - Pavićević, Vladimir
AU  - Radović, Marko N.
AU  - Milojević, Svetomir
AU  - Marković, Miljana S.
AU  - Ristić, Mihailo S.
AU  - Povrenović, Dragan
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3739
AB  - Essential oils are aromatic, volatile, complex mixtures of various compounds, mainly hydrocarbons (monoterpene and sesquiterpene) and some oxygenated hydrocarbons. Juniper berry essential oil has wide application and high commercial value due to its considerable antimicrobial activities. It is used in medicine, food, cosmetic and pharmaceutical industry and veterinary medicine. Generally, it is obtained by hydrodistillation, technique for the extraction of substances which do not mix or mix very poorly with water and are unstable at their boiling temperatures. It provides high quality of essential oil and also represents a relatively simple, safe and environmentally friendly process. The variations in the chemical composition of the essential oil obtained from juniper berries at various distillation rates (3, 6 and 8 ml/min) and various mass ratio juniper berries-water (hydromodules -1:3, 1: 4 and 1: 5) are presented in this paper. It is important to emphasize that the variations made influence only in quantitative (mass%), but not in qualitative chemical composition (no differences, same 58 components were detected in all experiments). To reflect those effects, only 23 identified components with the content higher than 0.5 mass% were selected, constituted 95-96 mass% of the essential oils. The major constituents of the essential oils were monoterpenes (67.39-71.00 mass%), followed by sesquiterpenes (21.64-24.54 mass%), while the oxygenated monoterpene (1.54-2.42 mas.%) and oxygenated sesquiterpenes (0.89-1.46 mass%) were much less present. According to volatility, the high volatile (boiling point 153-167 degrees C) components are the main constituents of the essential oils (61.69-63.81 mass%), followed by the low volatile (boiling point 252-288 degrees C) components (22.57-26.04 mass%), and the least present medium volatile (boiling point 173-212 degrees C) components (7.24-9.61 mass%). The variations in the mass content of the essential oil at various distillation rates showed clear general trends for all hydromodules (with exceptions at some components). With the increasing of distillation rate, mass% of high and medium volatile components decreased, while mass% of low volatile components increased. This is caused by higher extraction of low volatile components at high distillation rate, which resulted the increasing of their mass%. The variations in the mass composition of the essential oil at various hydromodules showed less expressive trends for all distillation rates. That means it has much less influence on the mass composition than the variation of distillation rate. Therefore, experiments at various distillation rates should be continued in combination with the fractionation of the essential oil by simultaneous hydrodistillation and rectification, including the effects of preparation procedures of juniper berries and defining of optimal energy consumption, i.e., optimal time period of hydrodistillation.
PB  - Savez hemijskih inženjera, Beograd
T2  - Hemijska industrija
T1  - Influence of hydrodistillation rate and hydromodule on chemical composition of juniperus communis l. Essential oil
EP  - 10
IS  - 1
SP  - 1
VL  - 71
DO  - 10.2298/HEMIND151119011P
ER  - 

@article{
author = "Pavićević, Vladimir and Radović, Marko N. and Milojević, Svetomir and Marković, Miljana S. and Ristić, Mihailo S. and Povrenović, Dragan",
year = "2017",
abstract = "Essential oils are aromatic, volatile, complex mixtures of various compounds, mainly hydrocarbons (monoterpene and sesquiterpene) and some oxygenated hydrocarbons. Juniper berry essential oil has wide application and high commercial value due to its considerable antimicrobial activities. It is used in medicine, food, cosmetic and pharmaceutical industry and veterinary medicine. Generally, it is obtained by hydrodistillation, technique for the extraction of substances which do not mix or mix very poorly with water and are unstable at their boiling temperatures. It provides high quality of essential oil and also represents a relatively simple, safe and environmentally friendly process. The variations in the chemical composition of the essential oil obtained from juniper berries at various distillation rates (3, 6 and 8 ml/min) and various mass ratio juniper berries-water (hydromodules -1:3, 1: 4 and 1: 5) are presented in this paper. It is important to emphasize that the variations made influence only in quantitative (mass%), but not in qualitative chemical composition (no differences, same 58 components were detected in all experiments). To reflect those effects, only 23 identified components with the content higher than 0.5 mass% were selected, constituted 95-96 mass% of the essential oils. The major constituents of the essential oils were monoterpenes (67.39-71.00 mass%), followed by sesquiterpenes (21.64-24.54 mass%), while the oxygenated monoterpene (1.54-2.42 mas.%) and oxygenated sesquiterpenes (0.89-1.46 mass%) were much less present. According to volatility, the high volatile (boiling point 153-167 degrees C) components are the main constituents of the essential oils (61.69-63.81 mass%), followed by the low volatile (boiling point 252-288 degrees C) components (22.57-26.04 mass%), and the least present medium volatile (boiling point 173-212 degrees C) components (7.24-9.61 mass%). The variations in the mass content of the essential oil at various distillation rates showed clear general trends for all hydromodules (with exceptions at some components). With the increasing of distillation rate, mass% of high and medium volatile components decreased, while mass% of low volatile components increased. This is caused by higher extraction of low volatile components at high distillation rate, which resulted the increasing of their mass%. The variations in the mass composition of the essential oil at various hydromodules showed less expressive trends for all distillation rates. That means it has much less influence on the mass composition than the variation of distillation rate. Therefore, experiments at various distillation rates should be continued in combination with the fractionation of the essential oil by simultaneous hydrodistillation and rectification, including the effects of preparation procedures of juniper berries and defining of optimal energy consumption, i.e., optimal time period of hydrodistillation.",
publisher = "Savez hemijskih inženjera, Beograd",
journal = "Hemijska industrija",
title = "Influence of hydrodistillation rate and hydromodule on chemical composition of juniperus communis l. Essential oil",
pages = "10-1",
number = "1",
volume = "71",
doi = "10.2298/HEMIND151119011P"
}

Pavićević, V., Radović, M. N., Milojević, S., Marković, M. S., Ristić, M. S.,& Povrenović, D.. (2017). Influence of hydrodistillation rate and hydromodule on chemical composition of juniperus communis l. Essential oil. in Hemijska industrija
Savez hemijskih inženjera, Beograd., 71(1), 1-10.
https://doi.org/10.2298/HEMIND151119011P

Pavićević V, Radović MN, Milojević S, Marković MS, Ristić MS, Povrenović D. Influence of hydrodistillation rate and hydromodule on chemical composition of juniperus communis l. Essential oil. in Hemijska industrija. 2017;71(1):1-10.
doi:10.2298/HEMIND151119011P .

Pavićević, Vladimir, Radović, Marko N., Milojević, Svetomir, Marković, Miljana S., Ristić, Mihailo S., Povrenović, Dragan, "Influence of hydrodistillation rate and hydromodule on chemical composition of juniperus communis l. Essential oil" in Hemijska industrija, 71, no. 1 (2017):1-10,
https://doi.org/10.2298/HEMIND151119011P . .

TY  - JOUR
AU  - Milićević, Sonja
AU  - Povrenović, Dragan
AU  - Milošević, Vladan
AU  - Martinović, Sanja
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3536
AB  - In this paper the ability of three natural zeolites from different localities (Vranjska banja-VB, Igroš-I and Baia Mare-BM deposits) to remove copper has been investigated. These three zeolites were subjected to the elementary analysis as well as XRDP and DTA/TG analysis due to complete characterization. Cation exchange capacity of VB, I and BM zeolites were 150.1, 169.2, and 176.5 meq/100g. The maximum adsorption capacity for the copper adsorption on VB, I and BM-zeolites were 7.75, 8.51, and 11.18 mg/g. Based on the obtained results the mathematical expression that describes correlation between the CEC and copper adsorption capacity has been developed. This linear dependance has been tested with the vast variety of experimental results. According to this expression it is possible to predict the copper adsorption capacity for different zeolites based only on their CEC value.
AB  - U radu su prikazani rezultati ispitivanja uklanjanja jona bakra primenom tri prirodna zeolita sa različitih lokaliteta (Vranjska banja-VB, Igroš-I i Baia Mare-BM). U cilju karakterizacije zeolita, izvršena su ispitivanja elementarnog sastava, kao i rentgenska (XRDP) i termijska analiza (DTA/TG). Kapaciteti katjonske izmene (CEC) ispitivanih zeolita VB, I i BM iznose 150,1, 169,2 i 176,5 meq/100g. Maksimalni adsorpcioni kapaciteti bakra na VB, I i BM zeolitima iznose 7,75, 8,51, i 11,18 mg/g. Na osnovu ostvarenih rezultata, dobijena je matematička zavisnost koja dobro opisuje vezu između vrednosti CEC i adsorpcionog kapaciteta za bakar. Ova lineralna zavisnost je testirana primenom različitih eksperimentalnih rezultata. Primenom ove zavisnosti moguće je da se predvidi vrednost adsorpcionog kapaciteta bakra na različitim zeolitima poznavanjem njegove CEC vrednosti. .
PB  - University of Belgrade, Technical Faculty, Bor
T2  - Journal of Mining and Metallurgy A: Mining
T1  - Predicting the copper adsorption capacity on different zeolites
T1  - Predviđanje adsorpcionog kapaciteta bakra na različitim zeolitima
EP  - 63
IS  - 1
SP  - 57
VL  - 53
DO  - 10.5937/JMMA1701057M
ER  - 

@article{
author = "Milićević, Sonja and Povrenović, Dragan and Milošević, Vladan and Martinović, Sanja",
year = "2017",
abstract = "In this paper the ability of three natural zeolites from different localities (Vranjska banja-VB, Igroš-I and Baia Mare-BM deposits) to remove copper has been investigated. These three zeolites were subjected to the elementary analysis as well as XRDP and DTA/TG analysis due to complete characterization. Cation exchange capacity of VB, I and BM zeolites were 150.1, 169.2, and 176.5 meq/100g. The maximum adsorption capacity for the copper adsorption on VB, I and BM-zeolites were 7.75, 8.51, and 11.18 mg/g. Based on the obtained results the mathematical expression that describes correlation between the CEC and copper adsorption capacity has been developed. This linear dependance has been tested with the vast variety of experimental results. According to this expression it is possible to predict the copper adsorption capacity for different zeolites based only on their CEC value., U radu su prikazani rezultati ispitivanja uklanjanja jona bakra primenom tri prirodna zeolita sa različitih lokaliteta (Vranjska banja-VB, Igroš-I i Baia Mare-BM). U cilju karakterizacije zeolita, izvršena su ispitivanja elementarnog sastava, kao i rentgenska (XRDP) i termijska analiza (DTA/TG). Kapaciteti katjonske izmene (CEC) ispitivanih zeolita VB, I i BM iznose 150,1, 169,2 i 176,5 meq/100g. Maksimalni adsorpcioni kapaciteti bakra na VB, I i BM zeolitima iznose 7,75, 8,51, i 11,18 mg/g. Na osnovu ostvarenih rezultata, dobijena je matematička zavisnost koja dobro opisuje vezu između vrednosti CEC i adsorpcionog kapaciteta za bakar. Ova lineralna zavisnost je testirana primenom različitih eksperimentalnih rezultata. Primenom ove zavisnosti moguće je da se predvidi vrednost adsorpcionog kapaciteta bakra na različitim zeolitima poznavanjem njegove CEC vrednosti. .",
publisher = "University of Belgrade, Technical Faculty, Bor",
journal = "Journal of Mining and Metallurgy A: Mining",
title = "Predicting the copper adsorption capacity on different zeolites, Predviđanje adsorpcionog kapaciteta bakra na različitim zeolitima",
pages = "63-57",
number = "1",
volume = "53",
doi = "10.5937/JMMA1701057M"
}

Milićević, S., Povrenović, D., Milošević, V.,& Martinović, S.. (2017). Predicting the copper adsorption capacity on different zeolites. in Journal of Mining and Metallurgy A: Mining
University of Belgrade, Technical Faculty, Bor., 53(1), 57-63.
https://doi.org/10.5937/JMMA1701057M

Milićević S, Povrenović D, Milošević V, Martinović S. Predicting the copper adsorption capacity on different zeolites. in Journal of Mining and Metallurgy A: Mining. 2017;53(1):57-63.
doi:10.5937/JMMA1701057M .

Milićević, Sonja, Povrenović, Dragan, Milošević, Vladan, Martinović, Sanja, "Predicting the copper adsorption capacity on different zeolites" in Journal of Mining and Metallurgy A: Mining, 53, no. 1 (2017):57-63,
https://doi.org/10.5937/JMMA1701057M . .

TY  - JOUR
AU  - Urosević, Tijana
AU  - Povrenović, Dragan
AU  - Vukosavljević, Predrag
AU  - Urosević, Ivan
AU  - Stevanović, Snežana
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3598
AB  - This article provides an overview of recent developments and the published literature in microfiltration (MF) and ultrafiltration (UF) of fruit juices. In this review, we summarize studies by relating basic concepts of membrane filtration with reported results and outlining the important factors to consider in the practical use of MF and UF. The important factors influencing the filtration rate and product quality are type of feed solution (type of fruit juice), membrane selection and operating parameters (temperature, transmembrane pressure, cross-flow velocity and volume concentration ratio). According to physicochemical and sensory tests confirmed by many types of research, juices produced by membrane filtration are of an excellent quality. Membrane fouling is a critical issue and inhibits the wider application of membranes in the fruit juice industry. The use of cross-flow filtration is one of the main requirements for increasing permeate flux, but overall insufficient, so we considered various techniques (enzymatic pretreatment, mechanical and electrical techniques) for improving fruit juice flux during membrane clarification.
PB  - Elsevier, Amsterdam
T2  - Food and Bioproducts Processing
T1  - Recent developments in microfiltration and ultrafiltration of fruit juices
EP  - 161
SP  - 147
VL  - 106
DO  - 10.1016/j.fbp.2017.09.009
ER  - 

@article{
author = "Urosević, Tijana and Povrenović, Dragan and Vukosavljević, Predrag and Urosević, Ivan and Stevanović, Snežana",
year = "2017",
abstract = "This article provides an overview of recent developments and the published literature in microfiltration (MF) and ultrafiltration (UF) of fruit juices. In this review, we summarize studies by relating basic concepts of membrane filtration with reported results and outlining the important factors to consider in the practical use of MF and UF. The important factors influencing the filtration rate and product quality are type of feed solution (type of fruit juice), membrane selection and operating parameters (temperature, transmembrane pressure, cross-flow velocity and volume concentration ratio). According to physicochemical and sensory tests confirmed by many types of research, juices produced by membrane filtration are of an excellent quality. Membrane fouling is a critical issue and inhibits the wider application of membranes in the fruit juice industry. The use of cross-flow filtration is one of the main requirements for increasing permeate flux, but overall insufficient, so we considered various techniques (enzymatic pretreatment, mechanical and electrical techniques) for improving fruit juice flux during membrane clarification.",
publisher = "Elsevier, Amsterdam",
journal = "Food and Bioproducts Processing",
title = "Recent developments in microfiltration and ultrafiltration of fruit juices",
pages = "161-147",
volume = "106",
doi = "10.1016/j.fbp.2017.09.009"
}

Urosević, T., Povrenović, D., Vukosavljević, P., Urosević, I.,& Stevanović, S.. (2017). Recent developments in microfiltration and ultrafiltration of fruit juices. in Food and Bioproducts Processing
Elsevier, Amsterdam., 106, 147-161.
https://doi.org/10.1016/j.fbp.2017.09.009

Urosević T, Povrenović D, Vukosavljević P, Urosević I, Stevanović S. Recent developments in microfiltration and ultrafiltration of fruit juices. in Food and Bioproducts Processing. 2017;106:147-161.
doi:10.1016/j.fbp.2017.09.009 .

Urosević, Tijana, Povrenović, Dragan, Vukosavljević, Predrag, Urosević, Ivan, Stevanović, Snežana, "Recent developments in microfiltration and ultrafiltration of fruit juices" in Food and Bioproducts Processing, 106 (2017):147-161,
https://doi.org/10.1016/j.fbp.2017.09.009 . .

TY  - JOUR
AU  - Stojković, Ivan
AU  - Miladinović, Marija R.
AU  - Stamenković, Olivera S.
AU  - Banković-Ilić, Ivana B.
AU  - Povrenović, Dragan
AU  - Veljković, Vlada B.
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3289
AB  - Waste lard from piglet roasting and quicklime (basically CaO) as a priceless fatty feedstock and a cheap solid catalyst, respectively were tested for the biodiesel production by methanolysis in a batch stirred reactor at moderate reaction temperatures (40-60 degrees C) for the kinetic study. For comparison, unheated and heated pork lards, as well as pure CaO, were also included in this study. The mass transfer limitation was observed in the initial period of all methanolysis reactions. The kinetic model combining the changing-and first-order reaction rate laws with respect to triacylglycerols and fatty acid methyl esters (FAMEs), respectively was verified for all three lardy feedstocks and both catalysts. The catalytic activity of quicklime was the same as that of pure CaO. The activation energy was demonstrated to be independent of the feedstock and the catalyst (59.1 +/- 0.6 kJ/mol) but the waste lard reacted faster than the unheated and heated pork lards. At the methanol-to-lard molar ratio of 6:1, the catalyst amount of 5% (based on the lard weight) and the reaction temperature of 60 degrees C, a high FAME concentration in the final ester products (97.5%) within 60 min were achieved with the waste lard and quicklime in two consecutive batches. The same kinetic model was applicable in a continuous packed-bed tubular reactor filled with quicklime bits (2.0-3.15 mm) at the methanol-to-waste lard molar ratio of 6:1, the reaction temperature of 60 degrees C and the residence time of 1 h. Under these conditions, the biodiesel yield was 97.6%, while the FAME concentration in the biodiesel product was 96.5%.
PB  - Elsevier Sci Ltd, Oxford
T2  - Fuel
T1  - Biodiesel production by methanolysis of waste lard from piglet roasting over quicklime
EP  - 466
SP  - 454
VL  - 182
DO  - 10.1016/j.fuel.2016.06.014
ER  - 

@article{
author = "Stojković, Ivan and Miladinović, Marija R. and Stamenković, Olivera S. and Banković-Ilić, Ivana B. and Povrenović, Dragan and Veljković, Vlada B.",
year = "2016",
abstract = "Waste lard from piglet roasting and quicklime (basically CaO) as a priceless fatty feedstock and a cheap solid catalyst, respectively were tested for the biodiesel production by methanolysis in a batch stirred reactor at moderate reaction temperatures (40-60 degrees C) for the kinetic study. For comparison, unheated and heated pork lards, as well as pure CaO, were also included in this study. The mass transfer limitation was observed in the initial period of all methanolysis reactions. The kinetic model combining the changing-and first-order reaction rate laws with respect to triacylglycerols and fatty acid methyl esters (FAMEs), respectively was verified for all three lardy feedstocks and both catalysts. The catalytic activity of quicklime was the same as that of pure CaO. The activation energy was demonstrated to be independent of the feedstock and the catalyst (59.1 +/- 0.6 kJ/mol) but the waste lard reacted faster than the unheated and heated pork lards. At the methanol-to-lard molar ratio of 6:1, the catalyst amount of 5% (based on the lard weight) and the reaction temperature of 60 degrees C, a high FAME concentration in the final ester products (97.5%) within 60 min were achieved with the waste lard and quicklime in two consecutive batches. The same kinetic model was applicable in a continuous packed-bed tubular reactor filled with quicklime bits (2.0-3.15 mm) at the methanol-to-waste lard molar ratio of 6:1, the reaction temperature of 60 degrees C and the residence time of 1 h. Under these conditions, the biodiesel yield was 97.6%, while the FAME concentration in the biodiesel product was 96.5%.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Fuel",
title = "Biodiesel production by methanolysis of waste lard from piglet roasting over quicklime",
pages = "466-454",
volume = "182",
doi = "10.1016/j.fuel.2016.06.014"
}

Stojković, I., Miladinović, M. R., Stamenković, O. S., Banković-Ilić, I. B., Povrenović, D.,& Veljković, V. B.. (2016). Biodiesel production by methanolysis of waste lard from piglet roasting over quicklime. in Fuel
Elsevier Sci Ltd, Oxford., 182, 454-466.
https://doi.org/10.1016/j.fuel.2016.06.014

Stojković I, Miladinović MR, Stamenković OS, Banković-Ilić IB, Povrenović D, Veljković VB. Biodiesel production by methanolysis of waste lard from piglet roasting over quicklime. in Fuel. 2016;182:454-466.
doi:10.1016/j.fuel.2016.06.014 .

Stojković, Ivan, Miladinović, Marija R., Stamenković, Olivera S., Banković-Ilić, Ivana B., Povrenović, Dragan, Veljković, Vlada B., "Biodiesel production by methanolysis of waste lard from piglet roasting over quicklime" in Fuel, 182 (2016):454-466,
https://doi.org/10.1016/j.fuel.2016.06.014 . .

TY  - JOUR
AU  - Stojković, Ivan
AU  - Banković-Ilić, Ivana B.
AU  - Velicković, Ana V.
AU  - Avramović, Jelena M.
AU  - Stamenković, Olivera S.
AU  - Povrenović, Dragan
AU  - Veljković, Vlada B.
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3424
AB  - The KOH-catalyzed methanolysis of waste lard from piglet roasting in a moderate temperature range was investigated in order to establish the reaction kinetics. For comparison, lard and thermally treated lard were also included in the study. All three reactions occurred via a pseudo-homogeneous regime where the chemical reaction controlled the overall process kinetics. A simple kinetic model comprising the irreversible pseudo-first-order reaction was demonstrated for all three fatty feedstocks. The reaction rate constant increases with raising the fatty acid unsaturation degree. The final products satisfied the EN 14214 biodiesel standard specifications.
PB  - Wiley-VCH Verlag Gmbh, Weinheim
T2  - Chemical Engineering & Technology
T1  - Waste Lard Methanolysis Catalyzed by KOH at Moderate Temperatures
EP  - 750
IS  - 4
SP  - 741
VL  - 39
DO  - 10.1002/ceat.201400705
ER  - 

@article{
author = "Stojković, Ivan and Banković-Ilić, Ivana B. and Velicković, Ana V. and Avramović, Jelena M. and Stamenković, Olivera S. and Povrenović, Dragan and Veljković, Vlada B.",
year = "2016",
abstract = "The KOH-catalyzed methanolysis of waste lard from piglet roasting in a moderate temperature range was investigated in order to establish the reaction kinetics. For comparison, lard and thermally treated lard were also included in the study. All three reactions occurred via a pseudo-homogeneous regime where the chemical reaction controlled the overall process kinetics. A simple kinetic model comprising the irreversible pseudo-first-order reaction was demonstrated for all three fatty feedstocks. The reaction rate constant increases with raising the fatty acid unsaturation degree. The final products satisfied the EN 14214 biodiesel standard specifications.",
publisher = "Wiley-VCH Verlag Gmbh, Weinheim",
journal = "Chemical Engineering & Technology",
title = "Waste Lard Methanolysis Catalyzed by KOH at Moderate Temperatures",
pages = "750-741",
number = "4",
volume = "39",
doi = "10.1002/ceat.201400705"
}

Stojković, I., Banković-Ilić, I. B., Velicković, A. V., Avramović, J. M., Stamenković, O. S., Povrenović, D.,& Veljković, V. B.. (2016). Waste Lard Methanolysis Catalyzed by KOH at Moderate Temperatures. in Chemical Engineering & Technology
Wiley-VCH Verlag Gmbh, Weinheim., 39(4), 741-750.
https://doi.org/10.1002/ceat.201400705

Stojković I, Banković-Ilić IB, Velicković AV, Avramović JM, Stamenković OS, Povrenović D, Veljković VB. Waste Lard Methanolysis Catalyzed by KOH at Moderate Temperatures. in Chemical Engineering & Technology. 2016;39(4):741-750.
doi:10.1002/ceat.201400705 .

Stojković, Ivan, Banković-Ilić, Ivana B., Velicković, Ana V., Avramović, Jelena M., Stamenković, Olivera S., Povrenović, Dragan, Veljković, Vlada B., "Waste Lard Methanolysis Catalyzed by KOH at Moderate Temperatures" in Chemical Engineering & Technology, 39, no. 4 (2016):741-750,
https://doi.org/10.1002/ceat.201400705 . .

TY  - JOUR
AU  - Pavićević, Vladimir
AU  - Marković, Miljana S.
AU  - Milojević, Svetomir
AU  - Ristić, Mihailo S.
AU  - Povrenović, Dragan
AU  - Veljković, Vlada B.
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3460
AB  - BACKGROUNDMicrowave-assisted hydrodistillation (MAHD) has widely been used to isolate essential oil from various plant materials, but it has not been applied yet to extract essential oil from juniper berries. The main goals of the present work were to establish a model describing the extraction kinetics and the chemical composition of the essential oil obtained. RESULTSA lower final essential oil yield from juniper berries was obtained by MAHD than by conventional hydrodistillation (HD). No significant differences in chemical compositions of the essential oils extracted by the two techniques were observed. The mechanism of both processes was the same and included fast (washing) and slow (diffusion) distillation of essential oil that occurred simultaneously. CONCLUSIONThe kinetic model involving simultaneous washing and diffusion of essential oil was verified for various plant materials (areal parts of savory and thyme, fennel seeds and juniper berries) for both MAHD and HD that indicated its general importance. For the first time, the kinetic models of MAHD and HD were compared. Knowledge of the juniper berry essential oil yield and the extraction kinetics is of importance from the technological and economics points of view, while the chemical composition determines its use.
PB  - Wiley, Hoboken
T2  - Journal of Chemical Technology and Biotechnology
T1  - Microwave-assisted hydrodistillation of juniper berry essential oil: kinetic modeling and chemical composition
EP  - 891
IS  - 4
SP  - 883
VL  - 91
DO  - 10.1002/jctb.4653
ER  - 

@article{
author = "Pavićević, Vladimir and Marković, Miljana S. and Milojević, Svetomir and Ristić, Mihailo S. and Povrenović, Dragan and Veljković, Vlada B.",
year = "2016",
abstract = "BACKGROUNDMicrowave-assisted hydrodistillation (MAHD) has widely been used to isolate essential oil from various plant materials, but it has not been applied yet to extract essential oil from juniper berries. The main goals of the present work were to establish a model describing the extraction kinetics and the chemical composition of the essential oil obtained. RESULTSA lower final essential oil yield from juniper berries was obtained by MAHD than by conventional hydrodistillation (HD). No significant differences in chemical compositions of the essential oils extracted by the two techniques were observed. The mechanism of both processes was the same and included fast (washing) and slow (diffusion) distillation of essential oil that occurred simultaneously. CONCLUSIONThe kinetic model involving simultaneous washing and diffusion of essential oil was verified for various plant materials (areal parts of savory and thyme, fennel seeds and juniper berries) for both MAHD and HD that indicated its general importance. For the first time, the kinetic models of MAHD and HD were compared. Knowledge of the juniper berry essential oil yield and the extraction kinetics is of importance from the technological and economics points of view, while the chemical composition determines its use.",
publisher = "Wiley, Hoboken",
journal = "Journal of Chemical Technology and Biotechnology",
title = "Microwave-assisted hydrodistillation of juniper berry essential oil: kinetic modeling and chemical composition",
pages = "891-883",
number = "4",
volume = "91",
doi = "10.1002/jctb.4653"
}

Pavićević, V., Marković, M. S., Milojević, S., Ristić, M. S., Povrenović, D.,& Veljković, V. B.. (2016). Microwave-assisted hydrodistillation of juniper berry essential oil: kinetic modeling and chemical composition. in Journal of Chemical Technology and Biotechnology
Wiley, Hoboken., 91(4), 883-891.
https://doi.org/10.1002/jctb.4653

Pavićević V, Marković MS, Milojević S, Ristić MS, Povrenović D, Veljković VB. Microwave-assisted hydrodistillation of juniper berry essential oil: kinetic modeling and chemical composition. in Journal of Chemical Technology and Biotechnology. 2016;91(4):883-891.
doi:10.1002/jctb.4653 .

Pavićević, Vladimir, Marković, Miljana S., Milojević, Svetomir, Ristić, Mihailo S., Povrenović, Dragan, Veljković, Vlada B., "Microwave-assisted hydrodistillation of juniper berry essential oil: kinetic modeling and chemical composition" in Journal of Chemical Technology and Biotechnology, 91, no. 4 (2016):883-891,
https://doi.org/10.1002/jctb.4653 . .

TY  - JOUR
AU  - Knezević, Milena
AU  - Povrenović, Dragan
PY  - 2015
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3113
AB  - In order to apply a spout-fluid bed reactor with a draft tube for the nitrification process of wastewater treatment, the influence of fluid-mechanical parameters on volumetric mass transfer coefficient was analyzed. Experiments were carried out in a 1000 mm high 2D semi-column with a draft tube. The draft tube had a cross section of 50 x 50 mm(2) and the annular region of the reactor had a cross section of 50 x 140 mm(2). The work described in this paper reports the influence of several fluid-mechanical parameters including liquid and gas flow rates, particle diameters and particle circulation on volumetric mass transfer coefficient, k(L)a. The liquid flow ranged from 3.5-4.5 m(3)/h and gas flow ranged from 300 to 800 L/h. The particles used were glass spheres with diameters of 3, 4, 5 and 6 mm. Tap water and air were used as the liquid and gas phase, respectively. The experimental results have shown that particle circulation through the draft tube contributes to k(L)a increase as well as the increase in the particle diameter, the gas and liquid flow rates.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Chemical Engineering Science
T1  - Influence of fluid-mechanical parameters on volumetric mass transfer coefficient in a spout-fluid bed with a draft tube
EP  - 137
SP  - 129
VL  - 134
DO  - 10.1016/j.ces.2015.04.030
ER  - 

@article{
author = "Knezević, Milena and Povrenović, Dragan",
year = "2015",
abstract = "In order to apply a spout-fluid bed reactor with a draft tube for the nitrification process of wastewater treatment, the influence of fluid-mechanical parameters on volumetric mass transfer coefficient was analyzed. Experiments were carried out in a 1000 mm high 2D semi-column with a draft tube. The draft tube had a cross section of 50 x 50 mm(2) and the annular region of the reactor had a cross section of 50 x 140 mm(2). The work described in this paper reports the influence of several fluid-mechanical parameters including liquid and gas flow rates, particle diameters and particle circulation on volumetric mass transfer coefficient, k(L)a. The liquid flow ranged from 3.5-4.5 m(3)/h and gas flow ranged from 300 to 800 L/h. The particles used were glass spheres with diameters of 3, 4, 5 and 6 mm. Tap water and air were used as the liquid and gas phase, respectively. The experimental results have shown that particle circulation through the draft tube contributes to k(L)a increase as well as the increase in the particle diameter, the gas and liquid flow rates.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Chemical Engineering Science",
title = "Influence of fluid-mechanical parameters on volumetric mass transfer coefficient in a spout-fluid bed with a draft tube",
pages = "137-129",
volume = "134",
doi = "10.1016/j.ces.2015.04.030"
}

Knezević, M.,& Povrenović, D.. (2015). Influence of fluid-mechanical parameters on volumetric mass transfer coefficient in a spout-fluid bed with a draft tube. in Chemical Engineering Science
Pergamon-Elsevier Science Ltd, Oxford., 134, 129-137.
https://doi.org/10.1016/j.ces.2015.04.030

Knezević M, Povrenović D. Influence of fluid-mechanical parameters on volumetric mass transfer coefficient in a spout-fluid bed with a draft tube. in Chemical Engineering Science. 2015;134:129-137.
doi:10.1016/j.ces.2015.04.030 .

Knezević, Milena, Povrenović, Dragan, "Influence of fluid-mechanical parameters on volumetric mass transfer coefficient in a spout-fluid bed with a draft tube" in Chemical Engineering Science, 134 (2015):129-137,
https://doi.org/10.1016/j.ces.2015.04.030 . .

TY  - JOUR
AU  - Stojković, Ivan
AU  - Stamenković, Olivera S.
AU  - Povrenović, Dragan
AU  - Veljković, Vlada B.
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2838
AB  - For commercial application, the ester product of alkali-catalyzed transesterification of vegetable oil or animal fats should be refined after glycerol separation by settling to fulfill the biodiesel standard specifications. This crude biodiesel, after neutralization and methanol removal, should be further cleaned by either one of the following methods: wet washing, dry washing, membrane extraction or using ion liquids. This paper presents a review on the traditional (wet and dry washing) and novel (membrane separation technology and usage of ion liquids) methods of crude biodiesel purification. It also provides a comparison of crude biodiesel purification methods. Each method has its advantages and disadvantages, which should be carefully analyzed when choosing the proper one for refining crude biodiesel.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Renewable & Sustainable Energy Reviews
T1  - Purification technologies for crude biodiesel obtained by alkali-catalyzed transesterification
EP  - 15
SP  - 1
VL  - 32
DO  - 10.1016/j.rser.2014.01.005
ER  - 

@article{
author = "Stojković, Ivan and Stamenković, Olivera S. and Povrenović, Dragan and Veljković, Vlada B.",
year = "2014",
abstract = "For commercial application, the ester product of alkali-catalyzed transesterification of vegetable oil or animal fats should be refined after glycerol separation by settling to fulfill the biodiesel standard specifications. This crude biodiesel, after neutralization and methanol removal, should be further cleaned by either one of the following methods: wet washing, dry washing, membrane extraction or using ion liquids. This paper presents a review on the traditional (wet and dry washing) and novel (membrane separation technology and usage of ion liquids) methods of crude biodiesel purification. It also provides a comparison of crude biodiesel purification methods. Each method has its advantages and disadvantages, which should be carefully analyzed when choosing the proper one for refining crude biodiesel.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Renewable & Sustainable Energy Reviews",
title = "Purification technologies for crude biodiesel obtained by alkali-catalyzed transesterification",
pages = "15-1",
volume = "32",
doi = "10.1016/j.rser.2014.01.005"
}

Stojković, I., Stamenković, O. S., Povrenović, D.,& Veljković, V. B.. (2014). Purification technologies for crude biodiesel obtained by alkali-catalyzed transesterification. in Renewable & Sustainable Energy Reviews
Pergamon-Elsevier Science Ltd, Oxford., 32, 1-15.
https://doi.org/10.1016/j.rser.2014.01.005

Stojković I, Stamenković OS, Povrenović D, Veljković VB. Purification technologies for crude biodiesel obtained by alkali-catalyzed transesterification. in Renewable & Sustainable Energy Reviews. 2014;32:1-15.
doi:10.1016/j.rser.2014.01.005 .

Stojković, Ivan, Stamenković, Olivera S., Povrenović, Dragan, Veljković, Vlada B., "Purification technologies for crude biodiesel obtained by alkali-catalyzed transesterification" in Renewable & Sustainable Energy Reviews, 32 (2014):1-15,
https://doi.org/10.1016/j.rser.2014.01.005 . .

TY  - JOUR
AU  - Tomić, Slavica
AU  - Knežević, Milena
AU  - Rajić, Nevenka
AU  - Povrenović, Dragan
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2626
AB  - The aim of this work is an investigation of the possible application of Serbian natural zeolitic tuff ('Igroš Vidojević' deposit, Brus, Serbia) for improvement of the spring water quality. The concentration of magnesium in spring waters in Raška area (in Southeast Serbia) is grater than 100 mg/dm3 and is unsuitable for everyday consumption. The experiments included investigation of fluid-mechanics tests of the zeolite particles with diameters of 1.5, 4 and 6 mm in a column with diameter of 65 mm and magnesium adsorption/desorption experiments in the column with a diameter of 110 mm. The results showed that the concentration of magnesium in the spring water can be decreased below the maximum allowed concentration of 50 mg/dm3 byusing the sodium enriched zeolite bed and optimal fluid-mechanics parameters.
AB  - Cilj ovog rada je ispitivanje mogućnosti primene srpskog prirodnog zeolita (ležište 'Igroš Vidojević' kod Brusa) za poboljšanje kvaliteta izvorske vode. Koncentracija magnezijuma u izvorskoj vodi u regionu Raška (jugozapad Srbije) je veća od 100 mg/dm3 i nepogodna za svakodnevnu upotrebu. U eksperimentima su izvršena fluidomehanička ispitivanja čestica zeolitskog tufa prečnika 1,5, 4 i 6 mm u koloni prečnika 65 mm, dok su ispitivanja adsorpcije/desorpcije magnezijuma izvedena u koloni prečnika 110 mm. Dobijeni rezultati su pokazali da se upotrebom zeolita koji je obogaćen natrijumom i uz odgovarajuće fluido mehaničke parametre sistema, koncentracija magnezijuma u sirovoj vodi može smanjiti ispod maksimalno dozvoljene koncentracije (MDK) u vodi za piće od 50 mg/dm3.
PB  - Association of Chemical Engineers of Serbia
T2  - Hemijska industrija
T1  - Removal of magnesium in spring water using the natural zeolite in a continuous flow system
T1  - Uklanjanje magnezijuma iz izvorske vode pomoću prirodnog zeolita u protočnom sistemu
EP  - 482
IS  - 4
SP  - 475
VL  - 68
DO  - 10.2298/HEMIND130709073T
ER  - 

@article{
author = "Tomić, Slavica and Knežević, Milena and Rajić, Nevenka and Povrenović, Dragan",
year = "2014",
abstract = "The aim of this work is an investigation of the possible application of Serbian natural zeolitic tuff ('Igroš Vidojević' deposit, Brus, Serbia) for improvement of the spring water quality. The concentration of magnesium in spring waters in Raška area (in Southeast Serbia) is grater than 100 mg/dm3 and is unsuitable for everyday consumption. The experiments included investigation of fluid-mechanics tests of the zeolite particles with diameters of 1.5, 4 and 6 mm in a column with diameter of 65 mm and magnesium adsorption/desorption experiments in the column with a diameter of 110 mm. The results showed that the concentration of magnesium in the spring water can be decreased below the maximum allowed concentration of 50 mg/dm3 byusing the sodium enriched zeolite bed and optimal fluid-mechanics parameters., Cilj ovog rada je ispitivanje mogućnosti primene srpskog prirodnog zeolita (ležište 'Igroš Vidojević' kod Brusa) za poboljšanje kvaliteta izvorske vode. Koncentracija magnezijuma u izvorskoj vodi u regionu Raška (jugozapad Srbije) je veća od 100 mg/dm3 i nepogodna za svakodnevnu upotrebu. U eksperimentima su izvršena fluidomehanička ispitivanja čestica zeolitskog tufa prečnika 1,5, 4 i 6 mm u koloni prečnika 65 mm, dok su ispitivanja adsorpcije/desorpcije magnezijuma izvedena u koloni prečnika 110 mm. Dobijeni rezultati su pokazali da se upotrebom zeolita koji je obogaćen natrijumom i uz odgovarajuće fluido mehaničke parametre sistema, koncentracija magnezijuma u sirovoj vodi može smanjiti ispod maksimalno dozvoljene koncentracije (MDK) u vodi za piće od 50 mg/dm3.",
publisher = "Association of Chemical Engineers of Serbia",
journal = "Hemijska industrija",
title = "Removal of magnesium in spring water using the natural zeolite in a continuous flow system, Uklanjanje magnezijuma iz izvorske vode pomoću prirodnog zeolita u protočnom sistemu",
pages = "482-475",
number = "4",
volume = "68",
doi = "10.2298/HEMIND130709073T"
}

Tomić, S., Knežević, M., Rajić, N.,& Povrenović, D.. (2014). Removal of magnesium in spring water using the natural zeolite in a continuous flow system. in Hemijska industrija
Association of Chemical Engineers of Serbia., 68(4), 475-482.
https://doi.org/10.2298/HEMIND130709073T

Tomić S, Knežević M, Rajić N, Povrenović D. Removal of magnesium in spring water using the natural zeolite in a continuous flow system. in Hemijska industrija. 2014;68(4):475-482.
doi:10.2298/HEMIND130709073T .

Tomić, Slavica, Knežević, Milena, Rajić, Nevenka, Povrenović, Dragan, "Removal of magnesium in spring water using the natural zeolite in a continuous flow system" in Hemijska industrija, 68, no. 4 (2014):475-482,
https://doi.org/10.2298/HEMIND130709073T . .

TY  - JOUR
AU  - Knežević, Milena M.
AU  - Povrenović, Dragan
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2637
AB  - Distribution of gas bubbles and volumetric mass transfer coefficient, kLɑ in a three phase system with different types of solid particles at different operation conditions were studied in this paper. The ranges of superficial gas and liquid velocities used in this study were 0.03-0.09 m/s and 0-0.1 m/s, respectively. The three different types of solid particles were used as a bed in the column (glass, dp of 3 and 6 mm and ceramic, dp of 6 mm). The experiments were carried out in 2D plexiglas column, 278 mmx20.4 mmx500 mm, and in cylindrical plexiglas column with the diameter of 64 mm and hight of 2000 mm. The kLɑ coefficient increases with gas and liquid velocities. The results show that the volumetric mass transfer coefficient has higher values in three phase system with solid particles in comparison to two phase system. The particles' properties (diameter and density) have major impact on oxygen mass transfer in three phase systems.
AB  - U ovom radu je proučavana distribucija mehurova i zapreminski koeficijent prenosa mase, kLɑ, u trofaznom sistemu, sa sferičnim česticama od stakla i keramike različitog prečnika pod različitim operativnim uslovima. Brzine gasa su se kretale u intervalu 0,03-0,09 m/s, a brzine tečnosti 0-0,1 m/s. Ispitivanja su se izvodila u kolonama od pleksiglasa različitih geometrija. 2D kolona dimenzija 278 mmx20,4 mmx500 mm i cilindrična kolona, prečnika 64 mm i visine 2000 mm. Rezultati su pokazali da prisustvo čestica u sistemu doprinosi povećanju zapreminskog koeficijenta prenosa mase, a da sa povećanjem brzine gasa i tečnosti njegova vrednost nastavlja da raste. Vrednost povećanja zapreminskog koeficijenta prenosa mase, u konkretnim fluido-mehaničkim uslovima, zavisi od karakteristika samih čestica.
PB  - Association of Chemical Engineers of Serbia
T2  - Hemijska industrija
T1  - The influence of fluid-mechanical characteristics of the system on the volumetric mass transfer coefficient and gas dispersion in three-phase system
T1  - Uticaj fluido-mehaničkih karakteristika sistema na zapreminski koeficijent prenosa mase i disperziju vazduha u trofaznom sistemu
EP  - 490
IS  - 4
SP  - 483
VL  - 68
DO  - 10.2298/HEMIND130629072K
ER  - 

@article{
author = "Knežević, Milena M. and Povrenović, Dragan",
year = "2014",
abstract = "Distribution of gas bubbles and volumetric mass transfer coefficient, kLɑ in a three phase system with different types of solid particles at different operation conditions were studied in this paper. The ranges of superficial gas and liquid velocities used in this study were 0.03-0.09 m/s and 0-0.1 m/s, respectively. The three different types of solid particles were used as a bed in the column (glass, dp of 3 and 6 mm and ceramic, dp of 6 mm). The experiments were carried out in 2D plexiglas column, 278 mmx20.4 mmx500 mm, and in cylindrical plexiglas column with the diameter of 64 mm and hight of 2000 mm. The kLɑ coefficient increases with gas and liquid velocities. The results show that the volumetric mass transfer coefficient has higher values in three phase system with solid particles in comparison to two phase system. The particles' properties (diameter and density) have major impact on oxygen mass transfer in three phase systems., U ovom radu je proučavana distribucija mehurova i zapreminski koeficijent prenosa mase, kLɑ, u trofaznom sistemu, sa sferičnim česticama od stakla i keramike različitog prečnika pod različitim operativnim uslovima. Brzine gasa su se kretale u intervalu 0,03-0,09 m/s, a brzine tečnosti 0-0,1 m/s. Ispitivanja su se izvodila u kolonama od pleksiglasa različitih geometrija. 2D kolona dimenzija 278 mmx20,4 mmx500 mm i cilindrična kolona, prečnika 64 mm i visine 2000 mm. Rezultati su pokazali da prisustvo čestica u sistemu doprinosi povećanju zapreminskog koeficijenta prenosa mase, a da sa povećanjem brzine gasa i tečnosti njegova vrednost nastavlja da raste. Vrednost povećanja zapreminskog koeficijenta prenosa mase, u konkretnim fluido-mehaničkim uslovima, zavisi od karakteristika samih čestica.",
publisher = "Association of Chemical Engineers of Serbia",
journal = "Hemijska industrija",
title = "The influence of fluid-mechanical characteristics of the system on the volumetric mass transfer coefficient and gas dispersion in three-phase system, Uticaj fluido-mehaničkih karakteristika sistema na zapreminski koeficijent prenosa mase i disperziju vazduha u trofaznom sistemu",
pages = "490-483",
number = "4",
volume = "68",
doi = "10.2298/HEMIND130629072K"
}

Knežević, M. M.,& Povrenović, D.. (2014). The influence of fluid-mechanical characteristics of the system on the volumetric mass transfer coefficient and gas dispersion in three-phase system. in Hemijska industrija
Association of Chemical Engineers of Serbia., 68(4), 483-490.
https://doi.org/10.2298/HEMIND130629072K

Knežević MM, Povrenović D. The influence of fluid-mechanical characteristics of the system on the volumetric mass transfer coefficient and gas dispersion in three-phase system. in Hemijska industrija. 2014;68(4):483-490.
doi:10.2298/HEMIND130629072K .

Knežević, Milena M., Povrenović, Dragan, "The influence of fluid-mechanical characteristics of the system on the volumetric mass transfer coefficient and gas dispersion in three-phase system" in Hemijska industrija, 68, no. 4 (2014):483-490,
https://doi.org/10.2298/HEMIND130629072K . .

TY  - JOUR
AU  - Antanasijević, Davor
AU  - Pocajt, Viktor
AU  - Povrenović, Dragan
AU  - Perić-Grujić, Aleksandra
AU  - Ristić, Mirjana
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2434
AB  - The aims of this study are to create an artificial neural network (ANN) model using non-specific water quality parameters and to examine the accuracy of three different ANN architectures: General Regression Neural Network (GRNN), Backpropagation Neural Network (BPNN) and Recurrent Neural Network (RNN), for prediction of dissolved oxygen (DO) concentration in the Danube River. The neural network model has been developed using measured data collected from the Bezdan monitoring station on the Danube River. The input variables used for the ANN model are water flow, temperature, pH and electrical conductivity. The model was trained and validated using available data from 2004 to 2008 and tested using the data from 2009. The order of performance for the created architectures based on their comparison with the test data is RNN  gt  GRNN  gt  BPNN. The ANN results are compared with multiple linear regression (MLR) model using multiple statistical indicators. The comparison of the RNN model with the MLR model indicates that the RNN model performs much better, since all predictions of the RNN model for the test data were within the error of less than +/- 10 %. In case of the MLR, only 55 % of predictions were within the error of less than +/- 10 %. The developed RNN model can be used as a tool for the prediction of DO in river waters.
PB  - Springer Heidelberg, Heidelberg
T2  - Environmental Science and Pollution Research
T1  - Modelling of dissolved oxygen content using artificial neural networks: Danube River, North Serbia, case study
EP  - 9013
IS  - 12
SP  - 9006
VL  - 20
DO  - 10.1007/s11356-013-1876-6
ER  - 

@article{
author = "Antanasijević, Davor and Pocajt, Viktor and Povrenović, Dragan and Perić-Grujić, Aleksandra and Ristić, Mirjana",
year = "2013",
abstract = "The aims of this study are to create an artificial neural network (ANN) model using non-specific water quality parameters and to examine the accuracy of three different ANN architectures: General Regression Neural Network (GRNN), Backpropagation Neural Network (BPNN) and Recurrent Neural Network (RNN), for prediction of dissolved oxygen (DO) concentration in the Danube River. The neural network model has been developed using measured data collected from the Bezdan monitoring station on the Danube River. The input variables used for the ANN model are water flow, temperature, pH and electrical conductivity. The model was trained and validated using available data from 2004 to 2008 and tested using the data from 2009. The order of performance for the created architectures based on their comparison with the test data is RNN  gt  GRNN  gt  BPNN. The ANN results are compared with multiple linear regression (MLR) model using multiple statistical indicators. The comparison of the RNN model with the MLR model indicates that the RNN model performs much better, since all predictions of the RNN model for the test data were within the error of less than +/- 10 %. In case of the MLR, only 55 % of predictions were within the error of less than +/- 10 %. The developed RNN model can be used as a tool for the prediction of DO in river waters.",
publisher = "Springer Heidelberg, Heidelberg",
journal = "Environmental Science and Pollution Research",
title = "Modelling of dissolved oxygen content using artificial neural networks: Danube River, North Serbia, case study",
pages = "9013-9006",
number = "12",
volume = "20",
doi = "10.1007/s11356-013-1876-6"
}

Antanasijević, D., Pocajt, V., Povrenović, D., Perić-Grujić, A.,& Ristić, M.. (2013). Modelling of dissolved oxygen content using artificial neural networks: Danube River, North Serbia, case study. in Environmental Science and Pollution Research
Springer Heidelberg, Heidelberg., 20(12), 9006-9013.
https://doi.org/10.1007/s11356-013-1876-6

Antanasijević D, Pocajt V, Povrenović D, Perić-Grujić A, Ristić M. Modelling of dissolved oxygen content using artificial neural networks: Danube River, North Serbia, case study. in Environmental Science and Pollution Research. 2013;20(12):9006-9013.
doi:10.1007/s11356-013-1876-6 .

Antanasijević, Davor, Pocajt, Viktor, Povrenović, Dragan, Perić-Grujić, Aleksandra, Ristić, Mirjana, "Modelling of dissolved oxygen content using artificial neural networks: Danube River, North Serbia, case study" in Environmental Science and Pollution Research, 20, no. 12 (2013):9006-9013,
https://doi.org/10.1007/s11356-013-1876-6 . .

TY  - JOUR
AU  - Antanasijević, Davor
AU  - Pocajt, Viktor
AU  - Povrenović, Dragan
AU  - Ristić, Mirjana
AU  - Perić-Grujić, Aleksandra
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2539
AB  - This paper describes the development of an artificial neural network (ANN) model for the forecasting of annual PM10 emissions at the national level, using widely available sustainability and economical/industrial parameters as inputs. The inputs for the model were selected and optimized using a genetic algorithm and the ANN was trained using the following variables: gross domestic product, gross inland energy consumption, incineration of wood, motorization rate, production of paper and paperboard, sawn wood production, production of refined copper, production of aluminum, production of pig iron and production of crude steel. The wide availability of the input parameters used in this model can overcome a lack of data and basic environmental indicators in many countries, which can prevent or seriously impede PM emission forecasting. The model was trained and validated with the data for 26 EU countries for the period from 1999 to 2006. PM10 emission data, collected through the Convention on Long-range Transboundary Air Pollution - CLRTAP and the EMEP Programme or as emission estimations by the Regional Air Pollution Information and Simulation (RAINS) model, were obtained from Eurostat. The ANN model has shown very good performance and demonstrated that the forecast of PM10 emission up to two years can be made successfully and accurately. The mean absolute error for two-year PM10 emission prediction was only 10%, which is more than three times better than the predictions obtained from the conventional multi-linear regression and principal component regression models that were trained and tested using the same datasets and input variables.
PB  - Elsevier Science Bv, Amsterdam
T2  - Science of the Total Environment
T1  - PM10 emission forecasting using artificial neural networks and genetic algorithm input variable optimization
EP  - 519
SP  - 511
VL  - 443
DO  - 10.1016/j.scitotenv.2012.10.110
ER  - 

@article{
author = "Antanasijević, Davor and Pocajt, Viktor and Povrenović, Dragan and Ristić, Mirjana and Perić-Grujić, Aleksandra",
year = "2013",
abstract = "This paper describes the development of an artificial neural network (ANN) model for the forecasting of annual PM10 emissions at the national level, using widely available sustainability and economical/industrial parameters as inputs. The inputs for the model were selected and optimized using a genetic algorithm and the ANN was trained using the following variables: gross domestic product, gross inland energy consumption, incineration of wood, motorization rate, production of paper and paperboard, sawn wood production, production of refined copper, production of aluminum, production of pig iron and production of crude steel. The wide availability of the input parameters used in this model can overcome a lack of data and basic environmental indicators in many countries, which can prevent or seriously impede PM emission forecasting. The model was trained and validated with the data for 26 EU countries for the period from 1999 to 2006. PM10 emission data, collected through the Convention on Long-range Transboundary Air Pollution - CLRTAP and the EMEP Programme or as emission estimations by the Regional Air Pollution Information and Simulation (RAINS) model, were obtained from Eurostat. The ANN model has shown very good performance and demonstrated that the forecast of PM10 emission up to two years can be made successfully and accurately. The mean absolute error for two-year PM10 emission prediction was only 10%, which is more than three times better than the predictions obtained from the conventional multi-linear regression and principal component regression models that were trained and tested using the same datasets and input variables.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Science of the Total Environment",
title = "PM10 emission forecasting using artificial neural networks and genetic algorithm input variable optimization",
pages = "519-511",
volume = "443",
doi = "10.1016/j.scitotenv.2012.10.110"
}

Antanasijević, D., Pocajt, V., Povrenović, D., Ristić, M.,& Perić-Grujić, A.. (2013). PM10 emission forecasting using artificial neural networks and genetic algorithm input variable optimization. in Science of the Total Environment
Elsevier Science Bv, Amsterdam., 443, 511-519.
https://doi.org/10.1016/j.scitotenv.2012.10.110

Antanasijević D, Pocajt V, Povrenović D, Ristić M, Perić-Grujić A. PM10 emission forecasting using artificial neural networks and genetic algorithm input variable optimization. in Science of the Total Environment. 2013;443:511-519.
doi:10.1016/j.scitotenv.2012.10.110 .

Antanasijević, Davor, Pocajt, Viktor, Povrenović, Dragan, Ristić, Mirjana, Perić-Grujić, Aleksandra, "PM10 emission forecasting using artificial neural networks and genetic algorithm input variable optimization" in Science of the Total Environment, 443 (2013):511-519,
https://doi.org/10.1016/j.scitotenv.2012.10.110 . .

TY  - JOUR
AU  - Milicević, Sonja
AU  - Milosević, Vladan
AU  - Povrenović, Dragan
AU  - Stojanović, Jovica
AU  - Martinović, Sanja
AU  - Babić, Biljana M.
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2398
AB  - The increasing levels of industrial wastewater released to the environment present a serious threat to human health, living resources, and ecological systems. Fe-modified zeolites were developed and tested for removal of Cu2+ and Zn2+ from contaminated water. The surfaces of the naturally occurring zeolite, clinoptilolite, were modified with Fe(III) oxyhydroxides using three different methods, denoted I, II, and III (FeCli(1), FeCli(2), and FeNaCli(1), respectively). The oxyhydroxides were prepared in Method I using 0.1 M FeCl3 center dot 6H(2)O in an acetate buffer (pH = 3.6); in Method II, using 10% FeCl3 center dot 6H(2)O solution in 0.1 M KOH (pH = 10); and Method III was the same as Method I except the clinoptilolite was pretreated with NaCl. Newly synthesized materials from these three methods were then tested for their ability to enhance the sorption capacity for Cu and Zn compared to the natural sample (Cli). Powder X-ray diffraction measurements and the chemical composition of these modified samples confirmed that clinoptilolite maintained its structure while amorphous Fe3+ species were synthesized. The specific surface area (BET method) of both the natural and modified clinoptilolite increased by 2 and 7.5 times for Methods I and II, respectively. Scanning electron microscopy and energy dispersive X-ray spectroscopy revealed that CaO was formed during Method I (FeCli(1)). Throughout the adsorption process, the hydrolysis of CaO and the release of OH- caused the precipitation of Cu and Zn hydroxide, which made the determination of the sorption capacity of FeCli(1) impossible. This phenomenon was avoided in Method III (FeNaCli(1)) because of the absence of exchangeable Ca2+. The adsorption experiments with Method II resulted in double-enchanced adsoprtion capacity. Laboratory batch experiments revealed that the sorption capacities increased in the following order: Cli  lt  FeCli(2)  lt  FeNaCli(1), for Cu: 0.121 mmol/g  lt  0.251 mmol/g  lt  0.403 mmol/g and for Zn: 0.128 mmol/g  lt  0.234 mmol/g  lt  0.381 mmol/g.
PB  - Clay Minerals Soc, Chantilly
T2  - Clays and Clay Minerals
T1  - Removal of heavy metals from aqueous solution using natural and fe(iii) oxyhydroxide clinoptilolite
EP  - 516
IS  - 6
SP  - 508
VL  - 61
DO  - 10.1346/CCMN.2013.0610603
ER  - 

@article{
author = "Milicević, Sonja and Milosević, Vladan and Povrenović, Dragan and Stojanović, Jovica and Martinović, Sanja and Babić, Biljana M.",
year = "2013",
abstract = "The increasing levels of industrial wastewater released to the environment present a serious threat to human health, living resources, and ecological systems. Fe-modified zeolites were developed and tested for removal of Cu2+ and Zn2+ from contaminated water. The surfaces of the naturally occurring zeolite, clinoptilolite, were modified with Fe(III) oxyhydroxides using three different methods, denoted I, II, and III (FeCli(1), FeCli(2), and FeNaCli(1), respectively). The oxyhydroxides were prepared in Method I using 0.1 M FeCl3 center dot 6H(2)O in an acetate buffer (pH = 3.6); in Method II, using 10% FeCl3 center dot 6H(2)O solution in 0.1 M KOH (pH = 10); and Method III was the same as Method I except the clinoptilolite was pretreated with NaCl. Newly synthesized materials from these three methods were then tested for their ability to enhance the sorption capacity for Cu and Zn compared to the natural sample (Cli). Powder X-ray diffraction measurements and the chemical composition of these modified samples confirmed that clinoptilolite maintained its structure while amorphous Fe3+ species were synthesized. The specific surface area (BET method) of both the natural and modified clinoptilolite increased by 2 and 7.5 times for Methods I and II, respectively. Scanning electron microscopy and energy dispersive X-ray spectroscopy revealed that CaO was formed during Method I (FeCli(1)). Throughout the adsorption process, the hydrolysis of CaO and the release of OH- caused the precipitation of Cu and Zn hydroxide, which made the determination of the sorption capacity of FeCli(1) impossible. This phenomenon was avoided in Method III (FeNaCli(1)) because of the absence of exchangeable Ca2+. The adsorption experiments with Method II resulted in double-enchanced adsoprtion capacity. Laboratory batch experiments revealed that the sorption capacities increased in the following order: Cli  lt  FeCli(2)  lt  FeNaCli(1), for Cu: 0.121 mmol/g  lt  0.251 mmol/g  lt  0.403 mmol/g and for Zn: 0.128 mmol/g  lt  0.234 mmol/g  lt  0.381 mmol/g.",
publisher = "Clay Minerals Soc, Chantilly",
journal = "Clays and Clay Minerals",
title = "Removal of heavy metals from aqueous solution using natural and fe(iii) oxyhydroxide clinoptilolite",
pages = "516-508",
number = "6",
volume = "61",
doi = "10.1346/CCMN.2013.0610603"
}

Milicević, S., Milosević, V., Povrenović, D., Stojanović, J., Martinović, S.,& Babić, B. M.. (2013). Removal of heavy metals from aqueous solution using natural and fe(iii) oxyhydroxide clinoptilolite. in Clays and Clay Minerals
Clay Minerals Soc, Chantilly., 61(6), 508-516.
https://doi.org/10.1346/CCMN.2013.0610603

Milicević S, Milosević V, Povrenović D, Stojanović J, Martinović S, Babić BM. Removal of heavy metals from aqueous solution using natural and fe(iii) oxyhydroxide clinoptilolite. in Clays and Clay Minerals. 2013;61(6):508-516.
doi:10.1346/CCMN.2013.0610603 .

Milicević, Sonja, Milosević, Vladan, Povrenović, Dragan, Stojanović, Jovica, Martinović, Sanja, Babić, Biljana M., "Removal of heavy metals from aqueous solution using natural and fe(iii) oxyhydroxide clinoptilolite" in Clays and Clay Minerals, 61, no. 6 (2013):508-516,
https://doi.org/10.1346/CCMN.2013.0610603 . .

TY  - JOUR
AU  - Knežević, Milena
AU  - Kicošević, Marija
AU  - Stojičić, Milena
AU  - Vidaković, Jana
AU  - Povrenović, Dragan
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2336
AB  - This paper presents the study of bubble distribution and volumetric mass transfer coefficient, kLa, in a three-phase system with spherical particles of glass and ceramic and non-spherical particles of ceramic and zeolite. Experiments were carried out in a cylindrical column with 64 mm diameter and height of 2000 mm and 2D column (278x20.4x500 mm). Gas velocity varied in the range of 0.03 to 0.09 m/s and liquid velocity was 0-0.1 m/s. Tap water and ammonium chloride solution of different concentrations were used as the liquid phase. Results showed that the presence of particles in the system increases volumetric coefficient of mass transfer, but it depends on the characteristics of the particles. It was shown that the presence of dissolved ammonium chloride in water contributes significantly to the reduction of the k,a value, compared to values obtained in pure water system.
AB  - U ovom radu je proučavana distribucija mehurova i zapreminski koeficijent prenosa mase, kLa, u trofaznom sistemu, sa sferičnim česticama od stakla i keramike i nesferičnim česticama od keramike i zeolita. Eksperimenti su vršeni u cilindričnoj koloni prečnika 64 mm i visine 2000 mm i 2D koloni dimenzija 278 x 20,4 x 500 mm. Brzine gasa su se kretale u intervalu 0,03-0,09 m/s, a brzine tečnosti 0-0,1 m/s. Kao tečna faza korišćena je česmenska voda i rastvor amonijum hlorida različitih koncentracija. Rezultati su pokazali da prisustvo čestica u sistemu utiče na povećanje zapreminskog koeficijenta prenosa mase, ali koliko će biti to povećanje zavisi od karakteristika samih čestica. Takođe je pokazano da prisustvo rastvorenog amonijum hlorida u vodi znatno doprinosi smanjenju vrednosti k,a u odnosu na vrednosti koje su dobijene u sistemu sa čistom vodom.
PB  - Udruženje za tehnologiju vode i sanitarno inžinjerstvo, Beograd
T2  - Voda i sanitarna tehnika
T1  - Influence of characteristics of particles and fluid on gas-liquid oxygen mass transfer and bubble distribution in three-phase system
T1  - Uticaj karakteristika čestica i fluida na prenos mase kiseonika iz gasne u tečnu fazu i distribuciju mehurova u trofaznom sistemu
EP  - 56
IS  - 4-5
SP  - 45
VL  - 43
UR  - https://hdl.handle.net/21.15107/rcub_technorep_2336
ER  - 

@article{
author = "Knežević, Milena and Kicošević, Marija and Stojičić, Milena and Vidaković, Jana and Povrenović, Dragan",
year = "2013",
abstract = "This paper presents the study of bubble distribution and volumetric mass transfer coefficient, kLa, in a three-phase system with spherical particles of glass and ceramic and non-spherical particles of ceramic and zeolite. Experiments were carried out in a cylindrical column with 64 mm diameter and height of 2000 mm and 2D column (278x20.4x500 mm). Gas velocity varied in the range of 0.03 to 0.09 m/s and liquid velocity was 0-0.1 m/s. Tap water and ammonium chloride solution of different concentrations were used as the liquid phase. Results showed that the presence of particles in the system increases volumetric coefficient of mass transfer, but it depends on the characteristics of the particles. It was shown that the presence of dissolved ammonium chloride in water contributes significantly to the reduction of the k,a value, compared to values obtained in pure water system., U ovom radu je proučavana distribucija mehurova i zapreminski koeficijent prenosa mase, kLa, u trofaznom sistemu, sa sferičnim česticama od stakla i keramike i nesferičnim česticama od keramike i zeolita. Eksperimenti su vršeni u cilindričnoj koloni prečnika 64 mm i visine 2000 mm i 2D koloni dimenzija 278 x 20,4 x 500 mm. Brzine gasa su se kretale u intervalu 0,03-0,09 m/s, a brzine tečnosti 0-0,1 m/s. Kao tečna faza korišćena je česmenska voda i rastvor amonijum hlorida različitih koncentracija. Rezultati su pokazali da prisustvo čestica u sistemu utiče na povećanje zapreminskog koeficijenta prenosa mase, ali koliko će biti to povećanje zavisi od karakteristika samih čestica. Takođe je pokazano da prisustvo rastvorenog amonijum hlorida u vodi znatno doprinosi smanjenju vrednosti k,a u odnosu na vrednosti koje su dobijene u sistemu sa čistom vodom.",
publisher = "Udruženje za tehnologiju vode i sanitarno inžinjerstvo, Beograd",
journal = "Voda i sanitarna tehnika",
title = "Influence of characteristics of particles and fluid on gas-liquid oxygen mass transfer and bubble distribution in three-phase system, Uticaj karakteristika čestica i fluida na prenos mase kiseonika iz gasne u tečnu fazu i distribuciju mehurova u trofaznom sistemu",
pages = "56-45",
number = "4-5",
volume = "43",
url = "https://hdl.handle.net/21.15107/rcub_technorep_2336"
}

Knežević, M., Kicošević, M., Stojičić, M., Vidaković, J.,& Povrenović, D.. (2013). Influence of characteristics of particles and fluid on gas-liquid oxygen mass transfer and bubble distribution in three-phase system. in Voda i sanitarna tehnika
Udruženje za tehnologiju vode i sanitarno inžinjerstvo, Beograd., 43(4-5), 45-56.
https://hdl.handle.net/21.15107/rcub_technorep_2336

Knežević M, Kicošević M, Stojičić M, Vidaković J, Povrenović D. Influence of characteristics of particles and fluid on gas-liquid oxygen mass transfer and bubble distribution in three-phase system. in Voda i sanitarna tehnika. 2013;43(4-5):45-56.
https://hdl.handle.net/21.15107/rcub_technorep_2336 .

Knežević, Milena, Kicošević, Marija, Stojičić, Milena, Vidaković, Jana, Povrenović, Dragan, "Influence of characteristics of particles and fluid on gas-liquid oxygen mass transfer and bubble distribution in three-phase system" in Voda i sanitarna tehnika, 43, no. 4-5 (2013):45-56,
https://hdl.handle.net/21.15107/rcub_technorep_2336 .

TY  - JOUR
AU  - Tomić, Simonida
AU  - Rajić, Nevenka
AU  - Hrenović, Jasna
AU  - Povrenović, Dragan
PY  - 2012
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2204
AB  - Natural zeolitic tuff from Brus (Serbia) consisting mostly of clinoptilolite (about 90%) has been investigated for the reduction of the Mg concentration in spring water. The sorption capacity of the zeolite is relatively low (about 2.5 mg Mg CI for the initial concentration of 100 mg Mg dm(-3)). The zeolitic tuff removes Mg from water solutions by ion exchange, which has been demonstrated by energy dispersive X-ray analysis (EDS). The extent of ion exchange was influenced by the pH and the initial Mg concentration. Kinetic studies revealed that Lagergen's pseudo-second order model was followed. Intra-particle diffusion of Mg2+ influenced the ion exchange, but it is not the rate-limiting step. Rather than having to dispose of the Mg-loaded (waste) zeolite, a possible application was tested. Addition to a wastewater with a low concentration of Mg showed that it could successfully make up for the lack of Mg micronutrient and, accordingly, enabled the growth of phosphate-accumulating bacteria A. Junii, increasing the amount of phosphate removed from the wastewater.
PB  - Mineralogical Soc, Twickenham
T2  - Clay Minerals
T1  - Removal of Mg from spring water using natural clinoptilolite
EP  - 92
IS  - 1
SP  - 81
VL  - 47
DO  - 10.1180/claymin.2012.047.1.81
ER  - 

@article{
author = "Tomić, Simonida and Rajić, Nevenka and Hrenović, Jasna and Povrenović, Dragan",
year = "2012",
abstract = "Natural zeolitic tuff from Brus (Serbia) consisting mostly of clinoptilolite (about 90%) has been investigated for the reduction of the Mg concentration in spring water. The sorption capacity of the zeolite is relatively low (about 2.5 mg Mg CI for the initial concentration of 100 mg Mg dm(-3)). The zeolitic tuff removes Mg from water solutions by ion exchange, which has been demonstrated by energy dispersive X-ray analysis (EDS). The extent of ion exchange was influenced by the pH and the initial Mg concentration. Kinetic studies revealed that Lagergen's pseudo-second order model was followed. Intra-particle diffusion of Mg2+ influenced the ion exchange, but it is not the rate-limiting step. Rather than having to dispose of the Mg-loaded (waste) zeolite, a possible application was tested. Addition to a wastewater with a low concentration of Mg showed that it could successfully make up for the lack of Mg micronutrient and, accordingly, enabled the growth of phosphate-accumulating bacteria A. Junii, increasing the amount of phosphate removed from the wastewater.",
publisher = "Mineralogical Soc, Twickenham",
journal = "Clay Minerals",
title = "Removal of Mg from spring water using natural clinoptilolite",
pages = "92-81",
number = "1",
volume = "47",
doi = "10.1180/claymin.2012.047.1.81"
}

Tomić, S., Rajić, N., Hrenović, J.,& Povrenović, D.. (2012). Removal of Mg from spring water using natural clinoptilolite. in Clay Minerals
Mineralogical Soc, Twickenham., 47(1), 81-92.
https://doi.org/10.1180/claymin.2012.047.1.81

Tomić S, Rajić N, Hrenović J, Povrenović D. Removal of Mg from spring water using natural clinoptilolite. in Clay Minerals. 2012;47(1):81-92.
doi:10.1180/claymin.2012.047.1.81 .

Tomić, Simonida, Rajić, Nevenka, Hrenović, Jasna, Povrenović, Dragan, "Removal of Mg from spring water using natural clinoptilolite" in Clay Minerals, 47, no. 1 (2012):81-92,
https://doi.org/10.1180/claymin.2012.047.1.81 . .