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Effect of chemical additives on electrokinetic remediation of Cr-contaminated soil coupled with a permeable reactive barrier

机译：化学添加剂对含铬污染土壤和渗透性反应性阻挡层电动修复的影响

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Chromium (Cr) contamination in soil, especially Cr(VI), is a serious threat to the environment and human health. The electrokinetic remediation (EKR) is a promising technology to remediate the Cr(VI). Therefore, in this study, EKR coupled with a permeable reactive barrier (PRB) was used to treat the Cr(VI)-contaminated soil. The CTMAB-Z, a modified zeolite (prepared with cetyltrimethyl ammonium bromide) alone and a mixture of CTMAB-Z and Fe(0) were used as PRB-1 and PRB-2 reactive media, respectively. The effect of chemical enhancers/additives, i.e. DL-tartaric acid and Tween 80 on EKR of Cr(VI) was also analysed in the contrasting experiments. While the effects of repair time, voltage gradient and DL-tartaric acid concentration on Cr(VI) remediation were investigated by using the multifactor orthogonal experiment which was based on contrasting experiments. The contrasting experiment results showed that the highest Cr(VI) removal rate (66.27%) and leaching efficiency (71.29%) were observed in the experimental group which had DL-tartaric acid and PRB-2. Furthermore, the multifactor orthogonal experiment results had depicted that the highest Cr(VI) removal rate (80.92%) and leaching efficiency (85.25%) were achieved after treating the samples at a voltage gradient of 2.5 V cm−1 for 8 days in the presence of 0.15 M concentration of DL-tartaric acid. This study demonstrated that Cr(VI) remediation through EKR process could be significantly enhanced by the use of PRB and additives.
机译：土壤中的铬（Cr）污染，尤其是Cr（VI），对环境和人类健康构成严重威胁。电动修复（EKR）是一种有前途的技术来修复Cr（VI）。因此，在这项研究中，EKR与可渗透反应性屏障（PRB）结合用于处理受Cr（VI）污染的土壤。单独使用CTMAB-Z，改性沸石（用十六烷基三甲基溴化铵制备）和CTMAB-Z和Fe（0）的混合物分别作为PRB-1和PRB-2反应性介质。在对比实验中还分析了化学增强剂/添加剂，即DL-酒石酸和吐温80对Cr（VI）的EKR的影响。同时采用基于对比实验的多因素正交试验研究了修复时间，电压梯度和DL-酒石酸浓度对Cr（VI）修复的影响。对比实验结果表明，在含有DL-酒石酸和PRB-2的实验组中，最高的Cr（VI）去除率（66.27％）和浸出效率（71.29％）。此外，多因素正交试验结果表明，在2.5 V cm -1的电压梯度下处理样品，可获得最高的Cr（VI）去除率（80.92％）和浸出效率（85.25％）。在存在0.15M浓度的DL-酒石酸的情况下持续8天。这项研究表明，通过使用PRB和添加剂，可以显着增强通过EKR工艺对Cr（VI）的修复。

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