基于硫酸亚铁的机械化学还原法处理六价铬污染土壤  

Treatment of Cr(Ⅵ)-contaminated soil through mechanochemical reduction with ferrous sulfate

作　　者：许维通 张紫薇 苑文仪 李培中 王临才 王晓岩[1] 张承龙 白建峰 王景伟 XU Weitong;ZHANG Ziwei;YUAN Wenyi;LI Peizhong;WANG Lincai;WANG Xiaoyan;ZHANG Chenglong;BAI Jianfeng;WANG Jingwei(School of Environmental and Materials Engineering, Shanghai Polytechnic University, Shanghai 201209, China;WEEE Research Centre of Shanghai Polytechnic University, Shanghai Collaborative Innovation Centre for Waste Electrical and Electronic Equipment Recycling, Shanghai 201209, China;Beijing Key Laboratory of Industrial Land Contamination and Remediation, Environmental Protection Research Institute of Light Industry, Beijing 100089, China)

机构地区：[1]上海第二工业大学环境与材料工程学院,上海201209 [2]上海电子废弃物资源化创新协调中心上海第二工业大学电子废弃物研究中心,上海201209 [3]北京轻工业环境保护研究所工业场地污染与修复北京市重点实验室,北京100089

出　　处：《环境工程学报》2018年第6期1759-1765,共7页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(21407105);上海第二工业大学研究生项目基金资助项目(A01GY17F022);上海第二工业大学校级特色-飞跃计划项目资助(EGD18XQD27);上海第二工业大学学科建设基金资助项目(A20NH1609B10-2)

摘　　要：通过机械化学还原法对六价铬污染土壤进行固化稳定化处理,采用《固体废物浸出毒性浸出方法硫酸硝酸法》(HJ/T 299-2007)对处理效果进行评价,以及使用激光粒度仪、SEM和XPS对处理前后土壤样品的粒径、形貌以及铬的价态变化等性质进行表征。分析结果显示,机械化学还原法处理可以有效降低土壤中六价铬的浸出浓度。当未添加七水合硫酸亚铁时,土壤中六价铬的浸出浓度由115 mg·L^(-1)降低至2.0 mg·L^(-1);而添加七水合硫酸亚铁作为还原剂时,六价铬浸出浓度由115 mg·L^(-1)降至0.16 mg·L^(-1)。另外,经过机械化学还原处理后的土壤样品颗粒变细并形成致密的团聚体以及发生六价铬向三价铬的转化。In this research, the solidification and stabilization treatment of Cr（Ⅵ）-contaminated soil through mechanochemical reduction with ferrous sulfate was investigated. The properties of soil after remediation by ball milled with or without ferrous sulfate were characterized by XRD, SEM and XPS analysis. And the leachable fraction of Cr（Ⅵ） from the treated samples is also analyzed through the method HJ/T 299-2007. The results indicate that mechanochemical remediation is very effective for the solidification and stabilization of Cr（Ⅵ）-contaminated soil.Cr（Ⅵ） leaching concentration decreased from 115 to 2.0 and 0.16 mg·L^-1, respectively, when without and with ferrous sulfate. In addition, during mechanochemical treatment, decrease in particle size, agglomeration and the conversion between Cr（Ⅵ） and Cr（Ⅲ） in contaminated soil are observed.

关 键 词：铬污染土壤修复 机械化学 还原 固化稳定化 硫酸亚铁 

分 类 号：X53[环境科学与工程—环境工程]