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酸化-电动强化修复铬渣场地污染土壤

薛 浩 孟凡生 王业耀 郭金辉 纪冬丽 杨 琦

薛 浩, 孟凡生, 王业耀, 郭金辉, 纪冬丽, 杨 琦. 酸化-电动强化修复铬渣场地污染土壤[J]. 环境科学研究, 2015, 28(8): 1317-1323.
引用本文: 薛 浩, 孟凡生, 王业耀, 郭金辉, 纪冬丽, 杨 琦. 酸化-电动强化修复铬渣场地污染土壤[J]. 环境科学研究, 2015, 28(8): 1317-1323.
XUE Hao, MENG Fansheng, WANG Yeyao, GUO Jinhui, JI Dongli, YANG Qi. Remediation of Chromium Residue-Contaminated Soil by Preacidification Electrokinetic Remediation[J]. Research of Environmental Sciences, 2015, 28(8): 1317-1323.
Citation: XUE Hao, MENG Fansheng, WANG Yeyao, GUO Jinhui, JI Dongli, YANG Qi. Remediation of Chromium Residue-Contaminated Soil by Preacidification Electrokinetic Remediation[J]. Research of Environmental Sciences, 2015, 28(8): 1317-1323.

酸化-电动强化修复铬渣场地污染土壤

基金项目: 国家自然科学基金项目(51308520)

Remediation of Chromium Residue-Contaminated Soil by Preacidification Electrokinetic Remediation

  • 摘要: 为解决常规电动修复方法对Cr污染土壤Cr(T)(总Cr)去除效率低的问题,提出了酸化预处理-电动强化修复技术. 以国内某化工厂铬渣堆放场地Cr污染土壤为研究对象,通过改变土壤酸化条件,分析乙酸和柠檬酸的酸化时间、酸浓度(以c计)对电动修复Cr污染土壤中Cr去除率的影响,并对土壤中Cr的形态进行分析. 结果表明:①酸化预处理-电动强化修复技术可以显著提高Cr污染土壤中Cr的去除率,其中0.9 mol/L柠檬酸酸化5 d组Cr(T)和Cr(Ⅵ)的去除率由对照组的6.23%、19.01%分别升至26.97%、77.66%. ②土壤酸化可以将部分Cr由碳酸盐结合态向水溶态转化,进而提高Cr去除率;在适宜的酸浓度范围内,酸浓度越高,土壤释放的Cr越多,Cr去除效果就越好. ③与乙酸组相比,柠檬酸组Cr的去除率较高,因为柠檬酸本身也是一种络合剂,在酸化作用释放碳酸盐结合态Cr的基础上,柠檬酸能与Cr发生络合作用,进一步提升了Cr的去除率. 电动修复过程中迁移出土壤的Cr主要以醋酸可提取态、可还原提取态和可氧化提取态为主,残留Cr的生物可利用性降低.

     

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