文献类型：期刊文献

英文题名：Enhancement of heavy metals desorption from the soil by eddy deep leaching in hydrocyclone

作者：Wang, Ning[1];Lu, Hao[1];Liu, Bo[1];Xiong, Tai[1];Li, Jianping[2];Wang, Hualin[2];Yang, Qiang[1]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Natl Engn Lab High Concentrat Refractory Organ Was, Shanghai 200237, Peoples R China

年份：2024

卷号：135

起止页码：242

外文期刊名：JOURNAL OF ENVIRONMENTAL SCIENCES

收录：;EI(收录号：20230713582301);WOS:【SCI-EXPANDED(收录号:WOS:001146210900001)】；

基金：This work is financially supported by the National Natural Sci- ence Foundation of China (No. 52025103) .

语种：英文

外文关键词：Heavy metals; Soil remediation; Oxalic acid; Eddy leaching; Hydrocyclone

摘要：An eddy deep leaching technology was developed in this paper to address the challenge of treating heavy metal contaminants in industrial mining areas. The desorption effect of As, Cd, Sb and Pb was investigated utilizing chemical leaching and physical eddy techniques. It was found that the heavy metals concentration increased with decreasing particle size. The highest proportion of Cd in the form distribution of soil was in the bound to iron and man-ganese oxides, while the maximum proportion of As, Sb and Pb were in the residual. The optimal solid-liquid ratio of the hydrocyclone was 1:20, and the corresponding separation efficiency and flow rate were 84.7% and 1.76 m3/hr, respectively. The grade efficiency of soil particle separation increases with particle size and exceeds 99% for particles above 1,000 pm. Leaching experiments have revealed that oxalic acid (OA) and a combination of oxalic acid and EDTA (OAPE) were more efficient than citric acid (CA) and a combination of citric acid and EDTA (CAPE) for the desorption of heavy metals, respectively. The comparison of OAPE and eddy leaching found that the latter improved the desorption efficiency by 9.4%, 7.5%, 7.2% and 7.8% for As, Cd, Sb and Pb compared to the former, respectively. The results demonstrated that the eddy leaching technique could further enhance the desorption effi-ciency of heavy metals. It is expected to provide technical support for soil remediation with reduced usage of leaching agents.(c) 2023 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.