School of Civil Engineering, University of South China, Hengyang, 421001, China.
Environ Sci Pollut Res Int. 2020 Feb;27(4):4478-4488. doi: 10.1007/s11356-019-06990-2. Epub 2019 Dec 12.
In the process of electrokinetic (EK) remediation of uranium-contaminated soil, the existence form of uranium in soil pore fluid will affect on its migration behavior. In this paper, a novel type of electrolyte (citric acid + ferric chloride, CA+ FeCl) has been investigated for the EK remediation of uranium-contaminated red soil. The effects of different electrolyte and the concentrations of FeCl on migration behavior of U(VI) and environmental risks were investigated after EK remediation. The result showed that the optimum concentration was 0.1 mol/L CA mixed with 0.03 mol/L FeCl in this study. At this time, the removal efficiency of uranium was about 61.55 ± 0.41%, and the cumulative energy consumption was 0.2559 kWh. Compared with deionized water and single CA, combined CA with FeCl has the advantages of high removal efficiency, low leaching toxicity, and less damage to the soil after the electrokinetic remediation treatment.
在电动修复铀污染土壤的过程中，土壤孔隙流体中铀的存在形态会影响其迁移行为。本研究采用柠檬酸+三氯化铁（CA+FeCl）新型电解质对铀污染红壤进行电动修复，考察了不同电解质及 FeCl 浓度对 U(VI)迁移行为及环境风险的影响。结果表明，在本研究中，最佳浓度为 0.1mol/LCA 与 0.03mol/LFeCl 混合。此时，铀的去除率约为 61.55±0.41%，累积能耗为 0.2559kWh。与去离子水和单一 CA 相比，CA 与 FeCl 联合使用具有去除效率高、浸出毒性低、电动修复处理后对土壤破坏小等优点。
