腐植酸强化电动法修复铜污染土壤的模拟研究

Simulation Study on Remedying Copper-contaminated Soil through the Electrokinetic Method Enhanced by Humic Acid

对腐植酸强化电动法修复铜污染土壤进行了实验室模拟研究。实验结果表明,加入螯合剂(EDTA、腐植酸)会大大提高电动修复铜污染土壤的效果,螯合剂与铜离子生成水溶性络合物,提高了铜离子在土壤中的迁移能力。EDTA作为比较试验,在强化电动修复铜离子污染土壤的迁移效果上没有腐植酸的强化效果好。当施加的腐植酸浓度大于临界胶束浓度(10 mg/L)时,可以起到表面活性剂的作用,有效地提高铜离子在土壤中的迁移效果,并使得铜离子在阴极附近富集。

The simulation study on remedying copper-contaminated soil through using the method of electrokinetic remediation enhanced by hnmic acid（HA） was conducted in this paper. The results showed that the remediation effect can be enhanced obviously by adding chelator, such as EDTA and HA. The mechanism was that the formation of watersoluble Cu-EDTA/Cu-HA complex could improve the transport ability of copper ions in soil. Comparedwith EDTA as chelator, the transport ability of copper ions affected by HA is better. HA has an action as a surfactant if its mass con- centration is above CMC（10 mg/L）, it can increase the transport effect of copper ions in soil, and make the ions accumu- lated nearby the cathode.