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阴极pH控制对重金属污染河涌底泥电动修复的影响

Keywords: 河涌底泥,重金属,电动修复,清洗液

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Abstract:

采用电动修复装置,选用电镀厂附近被Zn、Cu、Cr、Ni严重污染的河涌底泥作为试验材料。试验设计了3个不同pH值的阴极清洗液,施加直流电压25V,运行5d,研究了阴极清洗液的pH值对河涌底泥电动修复过程的影响。结果表明,阴极清洗液pH值的变化,对电动过程中电渗流的影响不大,但对电流大小的改变明显,pH值越低,电流越大;电动修复后,各处理的电动修复效果存在差异,其中,阴极清洗液的pH=5.0时,修复效果最好,Zn、Cu、Cr及Ni的去除率分别达到40.26%、34.08%、51.56%及32.93%。另外,各处理截面的重金属浓度较试验前都有不同程度的降低,其中Cr在底泥截面中的分布比较均匀;电动修复对各种形态的重金属都有不同程度的去除,对碳酸盐结合态的去除率最明显。

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