Concentration and speciation of heavy metals during water hyacinth composting

被引：105
作者：
Singh, Jiwan [1 ]
Kalamdhad, Ajay S. [1 ]
机构：
[1] Indian Inst Technol Guwahati IITG, Dept Civil Engn, Gauhati 781039, Assam, India
来源：
BIORESOURCE TECHNOLOGY | 2012年 / 124卷
关键词：
Composting; Water hyacinth; Heavy metal; Speciation; Bioavailability; SEWAGE-SLUDGE; ORGANIC-MATTER; STABILIZATION; PHYTOTOXICITY; BIOMASS; COPPER; ZINC; LEAD; ZN; CU;
D O I：
10.1016/j.biortech.2012.08.043
中图分类号：
S2 [农业工程];
学科分类号：
0828 ;
摘要：
The Tessier sequential extraction method was employed to investigate the changes in heavy metals speciation (Zn, Cu, Mn, Fe, Pb, Ni, Cd and Cr) during water hyacinth (Eichhornia crassipes) composting. Results showed that, the contents of total metals concentration were increased during the composting process. The largest proportion of metals was found in the residual fraction which was in more stable form and is consequently considered unavailable for plant uptake. Reducible and oxidizable fractions of Ni, Pb and Cd were not found in all trials during water hyacinth composting. The concentrations of Cu and Cd were very low comparative to the other metals, but the percentage of exchangeable and carbonate fractions were similar as other metals. From this study it can be concluded that the appropriate proportion of cattle manure addition (Trial 4) significantly reduced the mobile and easily available fractions (exchangeable and carbonate fractions) during the composting process. (C) 2012 Elsevier Ltd. All rights reserved.
引用
收藏
页码：169 / 179
页数：11
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