文献类型：期刊文献

英文题名：A critical review on advances in remediation of toxic heavy metals contaminated solids by chemical processes

作者：Alam, Ohidul[1];Zheng, Xiaojun[1];Du, Daolin[2];Qiao, Xiuchen[3];Dai, Longyun[4];Li, Jian[1];Xia, Jiaojiao[1];Ye, Jinhui[1];Zhong, Shan[4]

机构：[1]Jiangsu Univ, Inst Environm & Ecol, Sch Environm & Safety Engn, Zhenjiang 212013, Peoples R China;[2]Jiangsu Univ, Inst Environm & Ecol, Jingjiang Coll, Sch Environm & Safety Engn, Zhenjiang 212013, Peoples R China;[3]East China Univ Sci & Technol, Sch Resources & Environm Engn, Shanghai 200237, Peoples R China;[4]Jiangsu Univ, Sch Energy & Power Engn, Zhenjiang 212013, Peoples R China

年份：2024

卷号：12

期号：4

外文期刊名：JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING

收录：;EI(收录号：20242316210138);WOS:【SCI-EXPANDED(收录号:WOS:001257000200001)】；

基金：This review article financially supported by the Carbon Peak and Carbon Neutrality Technology Innovation Foundation of Jiangsu Province (BK20220030) , the Scientific Research Foundation for Senior Talent of Jiangsu University, China (20JDG41) , and Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment, Suzhou University of Science and Technology.

语种：英文

外文关键词：Chemical extraction; Toxic elements; Precipitation; Solids; Solvent extraction

摘要：This review was designed to present the state-of-the-art advances in chemical processes to remove Potentially Toxic Elements (PTEs) from contaminated solids including sludge, soil, municipal waste incineration fly ash, sediment and industrial waste. Chelation and acid extraction/chemical leaching are the major chemical processes and the PTEs removal efficiency mainly depends on several factors, such as PTEs speciation and their concentration, presence of chemical compounds, initial pH, and acid solution concentration. As chelants, Ethylenediaminetetraacetic acid (EDTA) and N,N-bis(carboxymethyl) glutamic acid (GLDA) demonstrated the promising performances although EDTA is slightly toxic, persistent and slow degradable. EDTA can be completely recycled by acid leaching/electrodialysis treatment, and thus reclaimed-EDTA showed almost similar PTEs removal efficiency as original-EDTA. The order of PTEs selectivity is Cd >= Pb >= Cu >= Zn >= Ni for soil, Pb>Zn approximate to Ni>Cd>Cu for sewage sludge by EDTA extraction. Ammonium citrate and citric acid showed effective PTEs removal, and the former is preferred for remediation of solids. Application of solvents including ionic liquid, biosurfactant, organic solvent and supercritical fluid on the remediation of solids are continuously growing. However, the employment of biosurfactant and organic solvent are recommended because they cannot only eliminate PTEs but also improve soil bio-physico-chemical properties. Chemical precipitation of PTEs (such as hydroxide compounds) is often applied to remove PTEs from contaminated solids by adding counter-ions. It has been an industrially established PTEs removal technology for hazardous solid waste; however, single utilization of it is not effective in remediation of solids. Finally, chemical extraction followed by precipitation is recommended for PTEs removal and recovery from contaminated solids.