Enhanced washing for Cr(VI) removal from contaminated soil using EDTA and microwave radiation
2015
Li, Jiang-Shan | Xue, Qiang | Wang, Ping | Zhang, Ting-Ting
Soils contaminated with Cr are commonly found. This study investigated Cr(VI) removal from contaminated soil using ethylenediaminetetraacetic acid (EDTA) and microwave-enhanced washing. The effects of microwave radiation time and power on Cr(VI) removal were also investigated. Results showed that the removal percentages of Cr(VI) with 0.01 and 0.05 mol/L EDTA were 61 and 85 %, respectively. These values increased by 21 and 30 % under microwave radiation (900 W, 5 min) compared with those without microwave treatment. The final Cr content in contaminated soil was 453.25 mg/kg, which was below the Class B limit (610 mg/kg) for soil quality in China for an exhibition area. In addition, the processing time to achieve the same removal efficiency was greatly reduced from 8 h to 5 min. Microwave-assisted EDTA washing can be a promising remediation method for Cr(VI)-contaminated sites.
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