Fate of metals before and after chemical extraction of incinerated sewage sludge ash
文献类型：会议论文
| 作者 | Li, Jiang-Shan1,2; Tsang, Daniel C. W.1; Wang, Qi-ming1; Fang, Le1; Xue, Qiang2 ; Poon, Chi Sun1
|
| 出版日期 | 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 |
| 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. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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