School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200072, PR China.
J Hazard Mater. 2012 Nov 15;239-240:128-34. doi: 10.1016/j.jhazmat.2012.08.039. Epub 2012 Aug 25.
This paper describes the enhanced Cr(VI)-contaminated soil remediation via a combination of electrokinetics (EK) with a calcined-hydrotalcite-based permeable reactive barrier (PRB). First, this combination proved to be feasible, and remarkably facilitated Cr(VI) remediation in a column test. Then, lightly-to-severely (0.16-1.65 mg/g) Cr(VI)-contaminated soil was remediated in a simulated test with the calcined hydrotalcite as the PRB under an voltage of 10-30 V (i.e. an electric field intensity of 0.7-2.0 V/cm). The observations demonstrated that both PRB and EK are critical to efficient remediation and the high de-contamination efficiency is supposedly attributed to the synergistic effect, for which EK concentrates anionic chromate to the anode region and PRB media (calcined hydrotalcite) absorbs and immobilizes it. Thus we have shown that the combined PRB-EK system is highly adaptive and effective in remediation of a larger area contaminated with chromate and various anionic pollutants.
本文描述了电动力学（EK）与煅烧水滑石基渗透反应屏障（PRB）相结合增强修复六价铬污染土壤的方法。首先，该组合被证明是可行的，并在柱试验中显著促进了六价铬的修复。然后，在模拟试验中，使用煅烧水滑石作为 PRB，在 10-30 V 的电压下（即电场强度为 0.7-2.0 V/cm）修复了轻度至重度（0.16-1.65mg/g）的六价铬污染土壤。实验结果表明，PRB 和 EK 对于有效修复都至关重要，高去除效率应归因于协同效应，EK 将阴离子铬酸盐集中到阳极区域，PRB 介质（煅烧水滑石）吸收并固定它。因此，我们已经表明，组合的 PRB-EK 系统在修复受铬酸盐和各种阴离子污染物污染的大面积区域方面具有高度适应性和有效性。
