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交换电极法强化电动修复铬污染土壤

Keywords: 电动修复,交换电极法,铬污染土壤,聚焦效应,电流密度

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Abstract:

pH值是影响污染土壤电动修复的主要因素。为此提出了交换电极法强化电动修复,并对该技术进行了实验研究。实验土壤Cr污染浓度为506.36mg/kg,工作电压为1V/cm,结果显示,固定电极方向运行模式下,运行2d,产生聚焦效应,运行8d,碱性区Cr(III)残留量和酸性区Cr(VI)残留量较大,分别是97.88mg/kg和328mg/kg,总铬去除率为59.04%。采用交换电极法,交换频率为4d,运行8d,总铬去除率为70.18%;交换频率为2d,运行8d,总铬去除率高达86.10%,土壤中总铬平均含量从506.36mg/kg降至73.56mg/kg,达到酸性土壤环境质量一级标准。该技术可控制土壤pH值在中性范围,电流密度高,不添加化学试剂,操作简单。

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