Fate of metals before and after chemical extraction of incinerated sewage sludge ash

doi:10.1016/j.chemosphere.2017.08.012

CORC > 武汉岩土力学研究所 > 中科院武汉岩土力学所 > 岩土力学所知识全产出 > 会议论文

	Fate of metals before and after chemical extraction of incinerated sewage sludge ash
	Li, Jiang-Shan 1,2; Tsang, Daniel C. W.1; Wang, Qi-ming 1; Fang, Le 1; Xue, Qiang2 ; Poon, Chi Sun 1
	2017
会议日期	MAY 25-28, 2017
会议地点	Hong Kong Polytechn Univ, Hung Hom, PEOPLES R CHINA
关键词	Heavy metals Incinerator ash Sewage sludge Mobility Bioaccessibility Chemical extraction
卷号	186
DOI	10.1016/j.chemosphere.2017.08.012
页码	350-359
英文摘要	Chemical extraction of incinerated sewage sludge ash (ISSA) can effectively recycle P, but it may change the speciation and mobility of the remaining metals. This study investigated the changes of the leaching potential and distribution of metals in the chemically extracted ISSA. Batch extraction experiments with different extractants, including inorganic acids, organic acids, and chelating agents, were conducted on the ISSA collected from a local sewage sludge incinerator. The extraction of Zn, Cu, Pb, Ni, Cd, Ba, Cr and As from the ISSA and the corresponding changes of the mobility and speciation were examined. The results showed that the metals in ISSA were naturally stable because large portions of metals were associated with the residual fraction. The inorganic (HNO3 and H2SO4) and organic acids (citric acid and oxalic acid) significantly co-dissolved the metals through acid dissolution, but the reduction in the total concentrations did not tally the leaching potential of the residual metals. The increase in the exchangeable fraction due to destabilization by the extractants significantly enhanced the mobility and leachability of the metals in the residual ISSA. Chelating agents (EDTA and EDTMP) only extracted a small quantity of metals and had a marginal effect on the fate of the residual metals, but they significantly reduced the Fe/Mn oxide-bound fraction. In comparison, the bioaccessibility of residual metals were reduced to varying extent. Therefore, the disposal or reuse of chemically extracted ISSA should be carefully evaluated in view of possible increase in mobility of residual metals in the environment. (C) 2017 Elsevier Ltd. All rights reserved.
会议录	CHEMOSPHERE
会议录出版者	PERGAMON-ELSEVIER SCIENCE LTD
会议录出版地	OXFORD
语种	英语
WOS研究方向	Environmental Sciences & Ecology
WOS记录号	WOS:000411846900041
内容类型	会议论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/4942]
专题	岩土力学所知识全产出_会议论文国家重点实验室知识产出_会议论文
作者单位	1.Hong Kong Polytech Univ, Dept Civil & Environm Engn; 2.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn
推荐引用方式 GB/T 7714	Li, Jiang-Shan,Tsang, Daniel C. W.,Wang, Qi-ming,et al. Fate of metals before and after chemical extraction of incinerated sewage sludge ash[C]. 见:. Hong Kong Polytechn Univ, Hung Hom, PEOPLES R CHINA. MAY 25-28, 2017.