文献类型：期刊文献

中文题名：EDTA强化电动修复土壤铅污染

英文题名：EDTA Enhanced Electroremediation of Lead-Contaminated Soil

作者：方一丰[1];郑余阳[1];唐娜[1];蔡兰坤[1]

机构：[1]华东理工大学资源与环境工程学院,上海200237

年份：2008

卷号：27

期号：2

起止页码：612

中文期刊名：农业环境科学学报

外文期刊名：Journal of Agro-Environment Science

收录：CSTPCD;;Scopus;北大核心:【北大核心2004】；CSCD:【CSCD2011_2012】；

基金：科技部世博科技攻关项目(2005BA908B16);上海市科委科研项目(05dz05816);校优秀青年教师科研项目(YB0157101)

语种：中文

中文关键词：EDTA;电动修复;碳酸铅;土壤污染

外文关键词：EDTA; electroremediation; PbC03; soil contamination

摘要：重金属离子在土壤中会产生沉淀和吸附现象,降低其移动能力,同时限制电动修复土壤污染的效率。化学络合剂EDTA能够与重金属盐反应,生成可溶性的金属络合物,提高重金属离子在土壤中迁移速率。利用沙箱、电极槽、循环电极淋洗系统和输送控制系统等人工实验装置研究了添加EDTA络合剂强化电动修复土壤碳酸铅污染的效果。结果表明,在阴极槽添加EDTA溶液,EDTA与电解产生的氢氧根离子反应,形成EDTA阴离子,在电场力作用下,EDTA阴离子进入土壤,与碳酸铅反应形成溶解态的络合物,提高铅离子的移动性,在电场力作用下Pb的最大去除率可达82.1%,同时EDTA和电导液浓度影响修复效果。在实验中EDTA利用率在5%-10%之间,可通过增加EDTA在土壤中的停留时间提高其利用率。
Precipitation and sorption of heavy metal ions in soil reduce their mobility and limit the effectiveness of electroremediation technologies. In electroremediation, the mobility of metal ion can be improved with the addition of complexing agent. This paper investigated the effect of electroremediating PbCO3 polluted soil with addition of EDTA. It was found that the EDTA added to the catholyte formed the anion in reaction with HO-, then anion was delivered into the soil to react with PbCO3 and produce soluble Pb-EDTA complex, so the mobility of Pb ion was greatly improved. The result showed the best removal efficiency of Pb reached 82.1%, and the concentration of EDTA and conductive solution affected the remediation effect. In the experiment, the utilization efficiency of EDTA was between 5% to 10%. The increase of residence time of EDTA in soil could enhance the utilization efficiency of EDTA.