原位电动修复氯离子污染土壤及地下水现场中试研究

Pilot Study on In-situ Electrokinetic Remediation of Chloride Ion Contaminated Soil and Groundwater

针对高浓度氯离子污染地块,开展原位电动修复技术中试研究。在电压梯度为1 V/cm,阴、阳极电解液pH值分别为10,3的条件下通电修复49 d,总耗电量为19385 kW·h,折合单位能耗为48.5 kW·h/m^(3)。中试区域内地下水中氯化物平均去除率达42.5%;土壤中氯离子平均去除率达37.5%,1.5,2.5 m深度土壤中氯离子平均去除率分别为45.4%,23.4%,上层去除率高于下层。原位电动修复技术实现了污染土壤及地下水的同步修复,且并未带入新的化学物质,避免造成二次污染,是一种高效低耗、环境友好的修复技术,具有广阔的应用前景。

A pilot study of in-situ electrokinetic remediation technology was conducted for a site contaminated with high concentrations of chloride ions.The pilot study lasted for 49 days,with a voltage gradient 1 V/cm,and the pH values for cathode and anode electrolytes of 10 and 3 respectively.The total power consumption was 9385 kw·h,which equivalent to a unit energy consumption of 48.5 kW·h/m^(2).The average removal rate of chloride in groundwater was 42.5%,whereas the removal rates of chloride ions in soil of 1.5 m and 2.5 m depth were 45.4%and 23.4%,respectively.The results showed the removal rate in the upper layer soil was higher than that in the lower layer.The pilot study illustrated that in-situ electrokinetic remediation technology can achieve simultaneous remediation of soil and groundwater without introducing new chemicals to cause secondary pollution.It is an efficient,low-consumption,environmentally friendly technology with a potential of broad application prospects.