电场强度对Fe(Ⅲ)强化电动修复Zn污染土壤效果的影响  

Effect of Electric Field Intensity on Fe(Ⅲ) Enhanced Electrokinetic Remediation of Zn-contaminated Soil

作　　者：祝方[1] 任文涛[1] ZHU Fang;REN Wentao(College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China)

机构地区：[1]太原理工大学环境科学与工程学院,山西太原030000

出　　处：《生态环境学报》2017年第7期1250-1254,共5页Ecology and Environmental Sciences

基　　金：山西省基础研究计划项目(2013011040-1)

摘　　要：在土壤修复技术中,电动力学修复技术具有处理效果好,没有二次污染,适用性广等特点。利用铁盐作为阴极电解液,柠檬酸-柠檬酸钠作为阳极电解液,结合阳离子膜研究不同电场强度(1.0 V·cm^(-1)、0.6 V·cm^(-1)、0.2 V·cm^(-1))对电动修复Zn污染土壤的影响,以期为电动修复技术的推广和应用提供理论基础。结果表明:在利用铁盐溶液作为阴极电解液时,Fe(Ш)可以消耗OH-,加快电解,有效维持土壤p H值,修复后土壤各截面的p H范围在3.1~9.8之间;随着电场强度的增大,电流逐渐增大,促进了土壤中Zn的解析,去除效率逐渐提高。随着电场强度的递减,相对应土壤截面Zn的最大去除率分别为86.47%、58.36%、41.72%;当电场强度为1 V·cm^(-1),修复400 h后土壤中Zn的总去除率达到54.1%。Among all of the remediation technology,electrokinetics remediation technology has unique treatment effect and moreapplication without secondary pollution.In this paper,we used ferric sulfate as the catholyte,citric acid-sodium citrate as theanolyte,combined with cation membrane technology to study the different electric field intensity(1.0V·cm-1,0.6V·cm-1,0.2V·cm-1)for the effect of electrokinetic remediation on the Zn-contaminated soil,further to provide the theoretical basis for thepopularization and application of electrokinetic remediation technology.In this paper,we used ferric sulfate as a cathodicelectrolyte to improve the electrokinetic remediation,designed to study the different electric field strength on the efficiency ofelectrokinetic remediation.The results showed that pH value of the soil could be maintained effectively when the iron salt solutionwas used as the catholyte and the range of pH value in the soil was3.1~9.8.The removal efficiency of Zn in the soil was enhancedwith the increase of electric field.When the electric field intensity was1V·cm-1,and the total removal rate of Zn was54.1%,themaximum removal rates of Zn in the soil sections were86.47%,58.36%and41.72%with the electric field decreased,respectively.

关 键 词：电动力学修复 ZN 土壤污染 FE(III) 电场强度 

分 类 号：X53[环境科学与工程—环境工程]