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
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  - Šiljić, Aleksandra
AU  - Ružić, Jovana
AU  - Knežević, Milena
AU  - Maksimović, Ana
AU  - Pocajt, Viktor
AU  - Ristić, Mirjana
PY  - 2009
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1376
AB  - Rapid population growth, urbanization and industrial growth have led to severe waste management problems in the cities of developing countries. The improper management of municipal solid waste is a major source of air, land and water pollution, and poses risks to human health and the environment. This article examines the current situation in the management of municipal solid waste in Belgrade, the impact of globalization on the waste generation, discusses lessons learned, and proposes a system for the proper management of municipal solid wastes. Considering the high proportion of organic matter in the waste generated in Belgrade (typically over 45%), composting can be an option to reduce the amount of waste that is land filled, thus extending the lifespan of municipal landfills. Also composting recycles nutrients by returning them back to the soil. Source separation of organic matter at households should be implemented in order to obtain high quality of the resulting compost. .
AB  - Porast broja stanovnika, urbanizacija i industrijalizacija doveli su do intenziviranja problema u oblasti upravljanja komunalnim čvrstim otpadom u zemljama u razvoju. Usled nepravilnog rukovanja otpadom dolazi do emisije zagađujućih materija u vazduh, vodu i zemljište, što za posledicu ima negativan uticaj na zdravlje ljudi i na životnu sredinu. U ovom radu izvršena je analiza trenutne situacije u Beogradu u oblasti upravljanja otpadom. U skladu sa dobijenim podacima i na osnovu ispitivanja sastava otpad preporučena su odgovarajuća savremena rešenja. Zbog visokog udela bio-otpada (više od 45 %), kompostiranje je pogodna metoda kojom bi se obezbedilo smanjenje količine otpada koji se deponuje, čime bi se produžio radni vek deponije. Takođe se kompostiranjem obezbeđuje kruženje materije u prirodi i nutrijenti se vraćaju u zemljište. Odvojeno sakupljanje, na izvoru razdvojenog biootpada, je preduslov za dobijanje kvalitetnog komposta. .
PB  - Naučno-stručno društvo za zaštitu životne sredine Srbije - Ecologica, Beograd
T2  - Ecologica
T1  - Natural resources protection by municipal solid waste recycling
T1  - Očuvanje prirodnih resursa reciklažom materijala iz komunalnog otpada
EP  - 172
IS  - 54
SP  - 169
VL  - 16
UR  - https://hdl.handle.net/21.15107/rcub_technorep_1376
ER  - 

@article{
author = "Šiljić, Aleksandra and Ružić, Jovana and Knežević, Milena and Maksimović, Ana and Pocajt, Viktor and Ristić, Mirjana",
year = "2009",
abstract = "Rapid population growth, urbanization and industrial growth have led to severe waste management problems in the cities of developing countries. The improper management of municipal solid waste is a major source of air, land and water pollution, and poses risks to human health and the environment. This article examines the current situation in the management of municipal solid waste in Belgrade, the impact of globalization on the waste generation, discusses lessons learned, and proposes a system for the proper management of municipal solid wastes. Considering the high proportion of organic matter in the waste generated in Belgrade (typically over 45%), composting can be an option to reduce the amount of waste that is land filled, thus extending the lifespan of municipal landfills. Also composting recycles nutrients by returning them back to the soil. Source separation of organic matter at households should be implemented in order to obtain high quality of the resulting compost. ., Porast broja stanovnika, urbanizacija i industrijalizacija doveli su do intenziviranja problema u oblasti upravljanja komunalnim čvrstim otpadom u zemljama u razvoju. Usled nepravilnog rukovanja otpadom dolazi do emisije zagađujućih materija u vazduh, vodu i zemljište, što za posledicu ima negativan uticaj na zdravlje ljudi i na životnu sredinu. U ovom radu izvršena je analiza trenutne situacije u Beogradu u oblasti upravljanja otpadom. U skladu sa dobijenim podacima i na osnovu ispitivanja sastava otpad preporučena su odgovarajuća savremena rešenja. Zbog visokog udela bio-otpada (više od 45 %), kompostiranje je pogodna metoda kojom bi se obezbedilo smanjenje količine otpada koji se deponuje, čime bi se produžio radni vek deponije. Takođe se kompostiranjem obezbeđuje kruženje materije u prirodi i nutrijenti se vraćaju u zemljište. Odvojeno sakupljanje, na izvoru razdvojenog biootpada, je preduslov za dobijanje kvalitetnog komposta. .",
publisher = "Naučno-stručno društvo za zaštitu životne sredine Srbije - Ecologica, Beograd",
journal = "Ecologica",
title = "Natural resources protection by municipal solid waste recycling, Očuvanje prirodnih resursa reciklažom materijala iz komunalnog otpada",
pages = "172-169",
number = "54",
volume = "16",
url = "https://hdl.handle.net/21.15107/rcub_technorep_1376"
}

Šiljić, A., Ružić, J., Knežević, M., Maksimović, A., Pocajt, V.,& Ristić, M.. (2009). Natural resources protection by municipal solid waste recycling. in Ecologica
Naučno-stručno društvo za zaštitu životne sredine Srbije - Ecologica, Beograd., 16(54), 169-172.
https://hdl.handle.net/21.15107/rcub_technorep_1376

Šiljić A, Ružić J, Knežević M, Maksimović A, Pocajt V, Ristić M. Natural resources protection by municipal solid waste recycling. in Ecologica. 2009;16(54):169-172.
https://hdl.handle.net/21.15107/rcub_technorep_1376 .

Šiljić, Aleksandra, Ružić, Jovana, Knežević, Milena, Maksimović, Ana, Pocajt, Viktor, Ristić, Mirjana, "Natural resources protection by municipal solid waste recycling" in Ecologica, 16, no. 54 (2009):169-172,
https://hdl.handle.net/21.15107/rcub_technorep_1376 .