考虑温度效应的铬污染软土电动修复研究

针对铬污染软黏土自行设计了电动修复试验装置, 开展铬污染软土室内试验, 研究污染土中重金属铬的去除特性, 分析电动修复过程中, 电流、温度、电解质溶液pH的变化以及电压、温度和铬初始浓度对电动修复试验效果的影响. 结果表明, 电动修复可以有效去除土壤中的Cr(VI), 增大电压有利于铬从污染土中释放; 当外加电压为36V时, 各组Cr(VI)去除率都达到了96%以上, 土壤中Cr(总)的最高去除率可达76%; 提高温度可以促进Cr(VI)的还原反应, 降低铬污染土的毒性, 可为重金属污染土的修复提供参考.

Study on electrokinetic remediation of chromium contaminated soft soil considering temperature effect

In this paper, a series of laboratory tests were carried out with electrokinetic remediation method for chromium-contaminated soft soil. The removal characteristics of heavy metal chromium from contaminated soil were studied considering factors such as voltage, temperature and initial concentration of chromium. The changes of current, temperature and pH of electrolyte solution during the process of electrokinetic remediation and the influence of voltage, temperature and initial concentration of chromium on the effect of electrokinetic remediation test were analyzed. The results show that Cr(VI) can be removed effectively from the soil during the electrokinetic remediation, and increasing the voltage is beneficial to the release of chromium from contaminated soil. When the applied voltage is 36V, the removal ratio of Cr(VI) in each group can reach over 96%, and the highest removal ratio of Cr (total) in the soil is 76%. Increasing the temperature can promote the removal of Cr(VI), and reduce the toxicity of chromium contaminated soil. The results can provide a theoretical basis for the electrokinetic remediation technology for heavy metal contaminated soil.