Solidified structure and leaching properties of metallurgical wastewater treatment sludge after solidification/stabilization process
Apstrakt
The presented study investigates solidification/stabilization process of hazardous heavy metals/arsenic sludge, generated after the treatment of the wastewater from a primary copper smelter. Fly ash and fly ash with addition of hydrated lime and Portland composite cement were studied as potential binders. The effectiveness of the process was evaluated by unconfined compressive strength (UCS) testing, leaching tests (EN 12457-4 and TCLP) and acid neutralization capacity (ANC) test. It was found that introduction of cement into the systems increased the UCS, led to reduced leaching of Cu, Ni and Zn, but had a negative effect on the ANC. Gradual addition of lime resulted in decreased UCS, significant reduction of metals leaching and high ANC, due to the excess of lime that remained unreacted in pozzolanic reaction. Stabilization of more than 99% of heavy metals and 90% of arsenic has been achieved. All the samples had UCS above required value for safe disposal. In addition to standard lea...ching tests, solidificates were exposed to atmospheric conditions during one year in order to determine the actual leaching level of metals in real environment. It can be concluded that the EN 12457-4 test is more similar to the real environmental conditions, while the TCLP test highly exaggerates the leaching of metals. The paper also presents results of differential acid neutralization (d-AN) analysis compared with mineralogical study done by scanning electron microscopy and X-ray diffraction analysis. The d-AN coupled with Eh-pH (Pourbaix) diagrams were proven to be a new effective method for analysis of amorphous solidified structure.
Ključne reči:
Solidification/stabilization / leaching tests / heavy metals / arsenic / acid neutralization capacity / differential acid neutralization analysis / Eh-pH diagramsIzvor:
Journal of Environmental Science and Health Part A-Toxic/Hazardous Substances & Environmental Engine, 2016, 51, 1, 34-43Izdavač:
- Taylor & Francis Inc, Philadelphia
Finansiranje / projekti:
- Inovativna sinergija nus-produkata, minimizacije otpada i čistije proizvodnje u metalurgiji (RS-MESTD-Technological Development (TD or TR)-34033)
DOI: 10.1080/10934529.2015.1079104
ISSN: 1093-4529
PubMed: 26457922
WoS: 000365284700004
Scopus: 2-s2.0-84947613158
Kolekcije
Institucija/grupa
Tehnološko-metalurški fakultetTY - JOUR AU - Radovanović, Dragana AU - Kamberović, Željko AU - Korać, Marija AU - Rogan, Jelena PY - 2016 UR - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3402 AB - The presented study investigates solidification/stabilization process of hazardous heavy metals/arsenic sludge, generated after the treatment of the wastewater from a primary copper smelter. Fly ash and fly ash with addition of hydrated lime and Portland composite cement were studied as potential binders. The effectiveness of the process was evaluated by unconfined compressive strength (UCS) testing, leaching tests (EN 12457-4 and TCLP) and acid neutralization capacity (ANC) test. It was found that introduction of cement into the systems increased the UCS, led to reduced leaching of Cu, Ni and Zn, but had a negative effect on the ANC. Gradual addition of lime resulted in decreased UCS, significant reduction of metals leaching and high ANC, due to the excess of lime that remained unreacted in pozzolanic reaction. Stabilization of more than 99% of heavy metals and 90% of arsenic has been achieved. All the samples had UCS above required value for safe disposal. In addition to standard leaching tests, solidificates were exposed to atmospheric conditions during one year in order to determine the actual leaching level of metals in real environment. It can be concluded that the EN 12457-4 test is more similar to the real environmental conditions, while the TCLP test highly exaggerates the leaching of metals. The paper also presents results of differential acid neutralization (d-AN) analysis compared with mineralogical study done by scanning electron microscopy and X-ray diffraction analysis. The d-AN coupled with Eh-pH (Pourbaix) diagrams were proven to be a new effective method for analysis of amorphous solidified structure. PB - Taylor & Francis Inc, Philadelphia T2 - Journal of Environmental Science and Health Part A-Toxic/Hazardous Substances & Environmental Engine T1 - Solidified structure and leaching properties of metallurgical wastewater treatment sludge after solidification/stabilization process EP - 43 IS - 1 SP - 34 VL - 51 DO - 10.1080/10934529.2015.1079104 ER -
@article{ author = "Radovanović, Dragana and Kamberović, Željko and Korać, Marija and Rogan, Jelena", year = "2016", abstract = "The presented study investigates solidification/stabilization process of hazardous heavy metals/arsenic sludge, generated after the treatment of the wastewater from a primary copper smelter. Fly ash and fly ash with addition of hydrated lime and Portland composite cement were studied as potential binders. The effectiveness of the process was evaluated by unconfined compressive strength (UCS) testing, leaching tests (EN 12457-4 and TCLP) and acid neutralization capacity (ANC) test. It was found that introduction of cement into the systems increased the UCS, led to reduced leaching of Cu, Ni and Zn, but had a negative effect on the ANC. Gradual addition of lime resulted in decreased UCS, significant reduction of metals leaching and high ANC, due to the excess of lime that remained unreacted in pozzolanic reaction. Stabilization of more than 99% of heavy metals and 90% of arsenic has been achieved. All the samples had UCS above required value for safe disposal. In addition to standard leaching tests, solidificates were exposed to atmospheric conditions during one year in order to determine the actual leaching level of metals in real environment. It can be concluded that the EN 12457-4 test is more similar to the real environmental conditions, while the TCLP test highly exaggerates the leaching of metals. The paper also presents results of differential acid neutralization (d-AN) analysis compared with mineralogical study done by scanning electron microscopy and X-ray diffraction analysis. The d-AN coupled with Eh-pH (Pourbaix) diagrams were proven to be a new effective method for analysis of amorphous solidified structure.", publisher = "Taylor & Francis Inc, Philadelphia", journal = "Journal of Environmental Science and Health Part A-Toxic/Hazardous Substances & Environmental Engine", title = "Solidified structure and leaching properties of metallurgical wastewater treatment sludge after solidification/stabilization process", pages = "43-34", number = "1", volume = "51", doi = "10.1080/10934529.2015.1079104" }
Radovanović, D., Kamberović, Ž., Korać, M.,& Rogan, J.. (2016). Solidified structure and leaching properties of metallurgical wastewater treatment sludge after solidification/stabilization process. in Journal of Environmental Science and Health Part A-Toxic/Hazardous Substances & Environmental Engine Taylor & Francis Inc, Philadelphia., 51(1), 34-43. https://doi.org/10.1080/10934529.2015.1079104
Radovanović D, Kamberović Ž, Korać M, Rogan J. Solidified structure and leaching properties of metallurgical wastewater treatment sludge after solidification/stabilization process. in Journal of Environmental Science and Health Part A-Toxic/Hazardous Substances & Environmental Engine. 2016;51(1):34-43. doi:10.1080/10934529.2015.1079104 .
Radovanović, Dragana, Kamberović, Željko, Korać, Marija, Rogan, Jelena, "Solidified structure and leaching properties of metallurgical wastewater treatment sludge after solidification/stabilization process" in Journal of Environmental Science and Health Part A-Toxic/Hazardous Substances & Environmental Engine, 51, no. 1 (2016):34-43, https://doi.org/10.1080/10934529.2015.1079104 . .