污染土壤电动修复过程中铜的形态转化研究  

Study on Speciation Transformation of Copper During the Electrokinetic Remediation of Contaminated Soil

作　　者：李亚林[1] 刘蕾[1] 王冰冰[1] 乔晓丹[1] 厉萌萌 运晓静 LI Yalin;LIU Lei;WANG Bingbing;QIAO Xiaodan;LI Mengmeng;YUN Xiaojing(Department of Resources and Environment,Henan Institute of Engineering Zhengzhou 451191)

机构地区：[1]河南工程学院资源与环境学院,郑州451191

出　　处：《工业安全与环保》2018年第9期95-99,104,共6页Industrial Safety and Environmental Protection

基　　金：河南省科技攻关项目(162102310402);郑州市科技攻关项目(20150237);河南工程学院博士基金(D2015008)

摘　　要：采用电动修复法对铜质量浓度为1 500 mg/kg的污染土壤进行处理,在不同修复时间条件下对铜的去除效果、电流变化和土壤p H值进行研究,在此基础上采用Tessier法对土壤中铜的不同形态进行了分离提取测定。结果表明,在修复电压为30 V,修复时间为7 d时,土壤中的铜质量浓度可以降至400 mg/kg以下,可交换态、碳酸盐结合态、铁锰氧化物结合态等不稳定态铜的总占比升高,有机物结合态、残渣态等稳定态铜的总占比降低,铜形态的变化有利于提升电动修复的效果。The contaminated soil with copper content of 1 500 mg/kg was treated by electrokinetic remediation.The removal efficiency of copper,current change and soil pH value were studied under different repair time,on the basis of which,the Tessier extraction procedure was applied to examine the speciation and concentration of copper in soil.The result shows the copper content in the soil can be reduced to below 400 mg/kg with repair voltage of 30 V and repair time of 7 d.The total proportion of unstable copper including exchangeable,carbonate-bound,and iron-manganese oxide bound is increased.Meanwhile,the total proportion of stable copper including organic matter bound and residualstate is decreased inversely.This change of copper morphology is beneficial to enhance the effect of electrokinetic remediation.

关 键 词：电动修复 铜 污染土壤 形态转化 

分 类 号：X53[环境科学与工程—环境工程]