高浓度含铜污染土壤的电动修复研究

为了探究电动修复法对高浓度含铜污染土壤修复的可行性，对铜含量为1500 mg/kg的污染土壤进行了电动修复。实验研究了不同修复时间下电流变化、土壤pH值变化和土壤中铜的迁移规律，并采用BCR法对土壤中铜的不同形态进行了分离提取测定。实验结果表明，电动修复技术对于高浓度含铜污染土壤中的铜具有良好的去除效果，在修复电压为30 V，修复时间为7 d时，土壤中的铜含量可以降至400 mg/kg以下。修复后铜的弱酸提取态占比增加，可还原态占比降低，可氧化态和残渣态占比无明显变化。

Research on High Concentrations of Copper Contamination Soil by Electrokinetic Remediation

In order to investigate the feasibility of electrokinetic remediation for high concentration of copper contaminated soil, electrokinetic remediation was carried out on contaminated soil with a copper content of 1500 mg/kg. The changes of electric currents, pH value of soil and migration regularities of copper in soil were investigated under different repair times. On the basis, the BCR extraction procedure was applied to examine the speciation and concentration of copper in soil. The experimental results showed that the electrokinetic remediation technology had a good removal effect on copper in high concentration copper contaminated soil. The soil can be reduced to below 400 mg/kg with repair voltage of 30 V and repair time of 7 d. After the repair, the ratio of weak acid soluble copper increased, the reducible ratio decreased and the ratio of oxidizable and residual was not obvious.