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电动修复Cd污染土壤的DBLM模型

Keywords: Cd污染土壤,电动修复,DBLM模型,土壤pH值

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Abstract:

以模拟Cd污染土壤为供试土壤,使用阳离子交换膜,在电场强度为1V·cm-1的条件下研究了电动修复过程中土壤中不同位置pH值和Cd浓度的关系,建立了一套与阳极距离相关的线性模型。该模型表明,阳离子交换膜阻止阴极产生的OH-进入土壤,阳极产生的H+在土壤颗粒表面不断发生吸附-脱附过程并达到平衡,土壤各剖面pH值与该剖面和阳极的距离成反比。此外,在电动修复初期,土壤中Cd分布较为均匀,不同位置Cd去除速率与该位置和阳极的距离成反比。由修复实验的相关数据进行拟合得到的结果也很好地证实了这一点(r2>0.94)。有助于预测不同位置的电动修复效果,了解土壤中Cd的迁移过程及制约因素,为增强修复效果及改进电动修复技术提供理论依据。

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