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Moisture content-affected electrokinetic remediation of Cr(VI)-contaminated clay by a hydrocalumite barrier

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  • Yunfeng Xu
  • Xianjiang Xu
  • Hetian Hou
  • JIa Zhang
  • Dayi Zhang
  • Guangren Qian
<mark>Journal publication date</mark>04/2016
<mark>Journal</mark>Environmental Science and Pollution Research
Number of pages7
Pages (from-to)6517-6523
Publication StatusPublished
Early online date4/12/15
<mark>Original language</mark>English


An electrokinetic–permeable reaction barrier (EKPRB) system was introduced in this study with hydrocalumite as the barrier material. The combined system effectively remediated the Cr(VI)-contaminated clay after a 72-h treatment, and the Cr(VI) 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 Cr(VI) removal process. Additionally, the total Cr removal efficiency was much lower than that of Cr(VI) owing to the partial conversion of Cr(VI) to Cr(III) in the electrokinetic remediation process. Under high soil moisture conditions (40 %), the removal efficiency of Cr(VI) and total Cr was 96.6 and 67.3 %, 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 EK-PRB system with a hydrocalumite barrier is highly promising with great potential for the effective remediation of Cr(VI)-contaminated clay and engineering implementation.