Authors: Yunfeng Xu Xiangjian Xu Hetian Hou Jia Zhang Dayi Zhang Guangren Qian
Publish Date: 2015/12/04
Volume: 23, Issue: 7, Pages: 6517-6523
Abstract
An electrokinetic–permeable reaction barrier EKPRB system was introduced in this study with hydrocalumite as the barrier material The combined system effectively remediated the CrVIcontaminated clay after a 72h treatment and the CrVI removal efficiency increased with the initial soil moisture content Further evidence was found that the changing soil pH value and current density were highly associated with the initial moisture content showing its important roles in the CrVI removal process Additionally the total Cr removal efficiency was much lower than that of CrVI owing to the partial conversion of CrVI to CrIII in the electrokinetic remediation process Under high soil moisture conditions 40 the removal efficiency of CrVI and total Cr was 966 and 673 respectively Further analysis also revealed the new mineral phase chromate hydrocalumite for Cr fixation in the hydrocalumite barrier which was significantly affected by the initial soil moisture content Our results showed that the EKPRB system with a hydrocalumite barrier is highly promising with great potential for the effective remediation of CrVIcontaminated clay and engineering implementation
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