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化工学报  2014 

柠檬酸工业废水强化镉污染土壤的电化学法修复

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Keywords: 电化学,修复,解吸附,柠檬酸工业废水,缓冲容量,

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Abstract:

通过批量解吸附实验和电化学修复实验,研究利用柠檬酸工业废水作为电化学修复的增效剂从高缓冲容量的天然土壤中去除镉的可行性。批量实验结果表明,当加入柠檬酸工业废水时,85%以上的镉能在土壤pH≤5.0的条件下从土壤中溶解到溶液中;在pH5.0-8.0范围内镉的解吸附率比用去离子水增加20%-45%。电化学修复实验结果表明,与相同pH值的HNO3相比,该废水作为电极溶液可使镉在土壤中发生明显迁移;在距离阳极0-4cm及8-10cm处土壤镉含量由282mg/kg降低至约167-200mg/kg,而在阳极距4-8cm处土壤镉含量升高至约400mg/kg。经过514小时的电化学修复,约84.7%的镉可以从土壤中去除,其中约94.6%从土壤中去除的镉富集在阴极溶液中。可见柠檬酸工业废水是一种非常有前景的重金属污染土壤电化学修复增效剂。

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