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ENHANCED REMEDIATION OF ARSENIC AND CHROMIUM CO-CONTAMINATED SOIL BY ELETROKINETIC-PERMEABLE REACTIVE BARRIERS WITH DIFFERENT REAGENTS
Xu, Y., J. Li, W. Xia, Y. Sun, G. Qian, and J. Zhang.
Environmental Science and Pollution Research 26(4):3392-3403(2019)

The effects of different reagents on an electrokinetic-permeable reactive barrier (EK-PRB) system were investigated for remediation of As and Cr co-contaminated soil. Reductants (ascorbic acid, sodium citrate) and a chelating agent (EDTA-2Na) were used to pretreat contaminated soil. The PRB contained CaAl-layered double hydroxide (CaAl-LDH) as reactive material, which captured As and Cr efficiently after EK-PRB after system startup, resulting in maximal fixed amounts of 126.5 mg/kg (As) and 1507.6 mg/kg (Cr). XRD and FTIR analyses of LDH indicated that As was mainly adsorbed on the surface of LDH, whereas Cr was intercalated into the LDH interlayer.



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