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Speciation of heavy metals during co-composting of sewage sludge with lime.
Chemosphere. 2006 May; 63(6):980-6.C

Abstract

During composting the humification of organic matter will have a significant effect on the physicochemical form of existence of heavy metals. Therefore the present study was conducted to investigate the effect of co-composting sewage sludge with lime on heavy metal speciation and the changes in DTPA extractable metals. Metal speciation was conducted to evaluate the redistribution of Cu, Mn, Ni, Pb and Zn in sewage sludge composted with lime. Sewage sludge was mixed with sawdust in 2:1 (w/w fresh weight) and then composted with lime at 0%, 0.63%, 1% or 1.63% (dry weight) for 100 days. The lime addition did not cause any changes in the different forms of Cu and Mn, but the composting process caused transformations of residual form of Cu and Mn into oxidizable and reducible form, respectively. For Ni, the reducible form was mainly transformed into residual form and lime addition decreased this transformation. Major transformation of different forms of Pb was not found, however the residual form of Pb increased with lime addition. The predominant residual form of Zn was mainly transformed into oxidizable form and the lime addition reduced this transformation. Addition of lime to sewage sludge during composting resulted in lower DTPA extractable metal contents. Therefore, lime is a suitable material to co-compost with sewage sludge to reduce the availability of heavy metals.

Authors+Show Affiliations

Department of Biology, Hong Kong Baptist University, Kowloon Tong, Hong Kong, China. jwcwong@hkbu.edu.hkNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

16288801

Citation

Wong, J W C., and A Selvam. "Speciation of Heavy Metals During Co-composting of Sewage Sludge With Lime." Chemosphere, vol. 63, no. 6, 2006, pp. 980-6.
Wong JW, Selvam A. Speciation of heavy metals during co-composting of sewage sludge with lime. Chemosphere. 2006;63(6):980-6.
Wong, J. W., & Selvam, A. (2006). Speciation of heavy metals during co-composting of sewage sludge with lime. Chemosphere, 63(6), 980-6.
Wong JW, Selvam A. Speciation of Heavy Metals During Co-composting of Sewage Sludge With Lime. Chemosphere. 2006;63(6):980-6. PubMed PMID: 16288801.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Speciation of heavy metals during co-composting of sewage sludge with lime. AU - Wong,J W C, AU - Selvam,A, Y1 - 2005/11/08/ PY - 2005/02/28/received PY - 2005/08/24/revised PY - 2005/08/29/accepted PY - 2005/11/18/pubmed PY - 2006/6/20/medline PY - 2005/11/18/entrez SP - 980 EP - 6 JF - Chemosphere JO - Chemosphere VL - 63 IS - 6 N2 - During composting the humification of organic matter will have a significant effect on the physicochemical form of existence of heavy metals. Therefore the present study was conducted to investigate the effect of co-composting sewage sludge with lime on heavy metal speciation and the changes in DTPA extractable metals. Metal speciation was conducted to evaluate the redistribution of Cu, Mn, Ni, Pb and Zn in sewage sludge composted with lime. Sewage sludge was mixed with sawdust in 2:1 (w/w fresh weight) and then composted with lime at 0%, 0.63%, 1% or 1.63% (dry weight) for 100 days. The lime addition did not cause any changes in the different forms of Cu and Mn, but the composting process caused transformations of residual form of Cu and Mn into oxidizable and reducible form, respectively. For Ni, the reducible form was mainly transformed into residual form and lime addition decreased this transformation. Major transformation of different forms of Pb was not found, however the residual form of Pb increased with lime addition. The predominant residual form of Zn was mainly transformed into oxidizable form and the lime addition reduced this transformation. Addition of lime to sewage sludge during composting resulted in lower DTPA extractable metal contents. Therefore, lime is a suitable material to co-compost with sewage sludge to reduce the availability of heavy metals. SN - 0045-6535 UR - https://www.unboundmedicine.com/medline/citation/16288801/Speciation_of_heavy_metals_during_co_composting_of_sewage_sludge_with_lime_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0045-6535(05)01093-3 DB - PRIME DP - Unbound Medicine ER -