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

Xu, Yunfeng and Xu, Xianjiang and Hou, Hetian and Zhang, JIa and Zhang, Dayi and Qian, Guangren (2016) Moisture content-affected electrokinetic remediation of Cr(VI)-contaminated clay by a hydrocalumite barrier. Environmental Science and Pollution Research, 23. pp. 6517-6523. ISSN 0944-1344

Full text not available from this repository.

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 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.

Item Type:
Journal Article
Journal or Publication Title:
Environmental Science and Pollution Research
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/2300/2307
Subjects:
ID Code:
80986
Deposited By:
Deposited On:
17 Aug 2016 10:02
Refereed?:
Yes
Published?:
Published
Last Modified:
29 Jul 2020 02:31