Total concentrations and chemical speciation of heavy metals in liquefaction residues of sewage sludge |
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Authors: | Yuan Xingzhong Huang Huajun Zeng Guangming Li Hui Wang Jingyu Zhou Chunfei Zhu Huina Pei Xiaokai Liu Zhifeng Liu Zhantao |
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Institution: | a College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China b Key Laboratory of Environment Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, PR China c School of Material Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, PR China |
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Abstract: | The risk (including bioavailability and eco-toxicity) of heavy metals (Pb, Zn, Cu, Cd, Cr and Ni) in liquefaction residues (LR) of sewage sludge (SS) was estimated, according to both the speciation of heavy metals and the local environmental characteristics. The amount of organic matters in LR was lower than that in SS, resulting in a smaller calorific value, while the total content of heavy metals in LR nearly doubled. High residual rates of heavy metals (about 80%) indicated that the heavy metals in SS were concentrated into LR after liquefaction. The comparisons of sequential extraction results between SS and LR showed that after liquefaction, the mobile and easily available heavy metal fractions (acid soluble/exchangeable and reducible fractions) were mainly transformed into the relatively stable heavy metal fractions (oxidizable and residual fractions). The bioavailability and eco-toxicity of heavy metals in LR were relieved, though the total concentrations of heavy metals increased. |
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Keywords: | Sewage sludge Liquefaction residues Heavy metals Metal speciation Bioavailability |
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