Document Detail

Quantitative evaluation of heavy metals' pollution hazards in liquefaction residues of sewage sludge.
MedLine Citation:
PMID:  21940164     Owner:  NLM     Status:  Publisher    
Liquefaction residues (LR) are the main by-products of sewage sludge (SS) liquefaction. This study quantitatively evaluates the potential ecological risk and pollution degrees of heavy metals (Pb, Zn, Cu, Cd, Cr and Ni) in LR versus SS. The leaching rates (R(1)) of heavy metals in LR were much lower than those in SS, revealing that the mobility/leachability of heavy metals was well suppressed after liquefaction. Geo-accumulation index (I(geo)) indicated that the liquefaction process significantly weakened the contamination degrees of heavy metals. Potential ecological risk index (RI) demonstrated that overall risks caused by heavy metals were obviously lowered from 1093.56 (very high risk) in SS to 4.72 and 1.51 (low risk) in LR1 and LR2, respectively. According to the risk assessment code (RAC), each tested heavy metal had no or low risk to the environments after liquefaction. In a word, the pollution hazards of heavy metals in LR were markedly mitigated.
Huajun Huang; Xingzhong Yuan; Guangming Zeng; Huina Zhu; Hui Li; Zhifeng Liu; Hongwei Jiang; Lijian Leng; Wenkai Bi
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-9-5
Journal Detail:
Title:  Bioresource technology     Volume:  -     ISSN:  1873-2976     ISO Abbreviation:  -     Publication Date:  2011 Sep 
Date Detail:
Created Date:  2011-9-23     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9889523     Medline TA:  Bioresour Technol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2011 Elsevier Ltd. All rights reserved.
College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environment Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, PR China.
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