Concentration and speciation of heavy metals in six different sewage sludge-composts

被引:205
作者
Cai, Quan-Ying
Mo, Ce-Hui [1 ]
Wu, Qi-Tang
Zeng, Qiao-Yun
Katsoyiannis, Athanasios
机构
[1] Jinan Univ, Dept Environm Engn, Guangzhou 510632, Peoples R China
[2] S CHina Agr Univ, Coll Resources & Environm, Guangzhou 510642, Peoples R China
[3] EU Joint Res Ctr, Inst Hlth & Consumer Protect, Phys & Chem Exposure Unit, I-21020 Ispra, Italy
基金
中国国家自然科学基金;
关键词
heavy metals; speciation; compost; sewage sludge; rice straw;
D O I
10.1016/j.jhazmat.2007.01.142
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
This study presents the concentrations and speciation of heavy metals (HMs) in six different composts of sewage sludges deriving from two wastewater treatment plants in China. After 56 days of sludge composting with rice straw at a low ON ratio (13:1), cadmium (Cd), copper (Cu), lead (Pb) and zinc (Zn) were enriched in sludge composts, exhibiting concentrations that varied from 0.75 to 2.0, 416 to 458, 66 to 168 and 1356 to 1750 mg kg(-1) dry weight (d.w.), respectively. The concentrations increased by 12-60% for Cd, 8-17% for Cu, 15-43% for Pb and 14-44% for Zn compared to those in sewage sludges. The total concentrations of individual or total elements in the final composts exceeded the maximum permissible limits proposed for compost or fertilizer. In all the final composts, more than 70% of total Cu was associated with organic matter-bound fraction, while Zn was mainly concentrated in exchangeable and Fe-Mn oxide-bound fractions which implied the high mobility and bioavailability. Continuously aerated composting treatment exhibited better compost quality and lower potential toxicity of HMs, whereas inoculant with microorganism and enzyme spiked during composting had no obvious advantage on humification of organic matter and on reducing HM mobility and bioavailability. (C) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码:1063 / 1072
页数:10
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