Document Detail

Changes of Cu, Zn, and Ni chemical speciation in sewage sludge co-composted with sodium sulfide and lime.
MedLine Citation:
PMID:  18574954     Owner:  NLM     Status:  MEDLINE    
A batch composting study was performed to evaluate the feasibility of co-composting sewage sludge with sodium sulfide and lime (SSL) mixture (Na2S/CaO = l:1), aiming at reducing the availability of heavy metals in the sludge compost. Sewage sludge with sawdust as a bulking agent was amended with SSL at 3% (w/w, dw), and composted for 15 d in laboratory batch reactors. The four stages of the Tessier sequential extraction method was employed to investigate changes in heavy metal fractions of Cu, Zn, and Ni in sewage sludge composted with SSL. For all the three metals, the mobile fractions, such as, exchangeable and carbonate bound were mainly transformed into low availability fractions (organic matter and sulfide, Fe-Mn oxides bound and residual forms), and the addition of SSL enhanced this transformation. Therefore, SSL is a suitable material to co-compost with sewage sludge to reduce the availability of heavy metals. According to the cabbage seed germination test, a SSL amendment of < or = 3% (w/w, dw) is recommended to co-compost with sewage sludge.
Xuejiang Wang; Ling Chen; Siqing Xia; Jianfu Zhao
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of environmental sciences (China)     Volume:  20     ISSN:  1001-0742     ISO Abbreviation:  J Environ Sci (China)     Publication Date:  2008  
Date Detail:
Created Date:  2008-06-25     Completed Date:  2009-01-06     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100967627     Medline TA:  J Environ Sci (China)     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  156-60     Citation Subset:  IM    
State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China.
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MeSH Terms
Brassica / drug effects,  growth & development
Calcium Compounds*
Copper / analysis*,  toxicity
Germination / drug effects
Nickel / analysis*,  toxicity
Waste Disposal, Fluid / methods*
Water Pollutants, Chemical / analysis*,  toxicity
Zinc / analysis*,  toxicity
Reg. No./Substance:
0/Calcium Compounds; 0/Oxides; 0/Sewage; 0/Sulfides; 0/Water Pollutants, Chemical; 1305-78-8/lime; 1313-82-2/sodium sulfide; 7440-02-0/Nickel; 7440-50-8/Copper; 7440-66-6/Zinc

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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