中文摘要：

电动修复作为一种绿色的土壤污染修复技术,因具有成本低、操作简单、不易造成二次污染等特点而有巨大的应用前景。以高岭土作为实验材料,研究了不同电场施加方式条件下铜、锌重金属的去除规律。为了进一步提高效率,实验配制pH为3.5的乙酸溶液并加入高岭土中,加入后可以加快土壤酸化并降低重金属沉淀区域的影响。相比于电解液为蒸馏水的情况,pH突变点向阴极靠近,从S3、S4片层移动到了S4、S5片层。加入乙酸后,实验最大电流和反应384 h后的电流相比未加乙酸升高较为明显。在相同条件下,电场强度为0.5 V·cm^-1时反应最高电流为60-139 mA,电场强度为1.0V·cm^-1时为108-170 mA,电场强度为1.5 V·cm^-1时为152-290 mA。在相同条件下反应384 h后的实验最低电流,电场强度为0.5 V·cm^-1时为33-70 mA,电场强度为1.0 V·cm^-1时为41-83 mA,电场强度为1.5 V·cm^-1时为71-123mA。高电场强度有利于去除土壤中的低浓度重金属污染物。相比电极室未添加乙酸的实验组,污染物去除率提高15%以上。

英文摘要：

Electrokinetic remediation is one of the environmental friendly soil remediation technology which has a promising prospect as a result of its low cost,easy operation and low secondary pollution. By using kaoline,removal performance of Cu and Zn is studied under the different condition of electric field. In order to improve the removal efficiencies of heavy metals,the electrolyte pH of acetic acid was set as 3. 5. And adding the acetic acid to kaoline where the acetic acid can contribute to soil acidification and less effects on heavy metal precipitation,which is hard to move in the electric field. Compared to distilled water,adding acetic acid can improve soil acidification and change pH catastrophe point moving to cathode,from S4,S5 to S3,S4,and the maximum electric current as well as maximum electric current after 384 hours rises obviously. Under the same conditions,the maximum electric current are from 60 to 139 mA,108 to 170 mA,152 to 290 mA when electric field intensity are0. 5,1. 0,1. 5 V·cm^-1,respectively. The minimum electric current after 384 h are from 33 to 70 mA,41 to83 mA,71 to 123 mA when electric field intensity are 0. 5,1. 0,1. 5 V·cm^-1,respectively. In conclusion,higher electric field intensity is more benefit for removal of heavy metals. The removal efficiency is 15% higherthan those who do not add acetic acid based on experimental data.