Final published version
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
}
TY - JOUR
T1 - Moisture content-affected electrokinetic remediation of Cr(VI)-contaminated clay by a hydrocalumite barrier
AU - Xu, Yunfeng
AU - Xu, Xianjiang
AU - Hou, Hetian
AU - Zhang, JIa
AU - Zhang, Dayi
AU - Qian, Guangren
PY - 2016/4
Y1 - 2016/4
N2 - 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 theinitial 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 importantroles 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.
AB - 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 theinitial 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 importantroles 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.
KW - Cr(VI)-contaminated clay
KW - Electrokinetic
KW - Permeable reaction barrier (PRB)
KW - Hydrocalumite
KW - Moisture content
U2 - 10.1007/s11356-015-5685-y
DO - 10.1007/s11356-015-5685-y
M3 - Journal article
VL - 23
SP - 6517
EP - 6523
JO - Environmental Science and Pollution Research
JF - Environmental Science and Pollution Research
SN - 0944-1344
ER -