Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing, 400714, China.
University of Chinese Academy of Sciences, Beijing, 100049, China.
Environ Sci Pollut Res Int. 2018 Apr;25(12):12159-12168. doi: 10.1007/s11356-018-1479-3. Epub 2018 Feb 17.
Soil contamination by persistent organic pollutants (POPs) poses a great threat to historically polluted soil worldwide. In this study, soils were characterized, and organochlorine pesticides contained in the soils were identified and quantified. Individual electrokinetic (IE), EK-Fenton-coupled technologies (EF), and enhanced EK-Fenton treatment (E-1, E-2, and E-3) were applied to remediate soils contaminated with hexachloro-cyclohexane soprocide (HCH) and dichloro-diphenyl-trichloroethane (DDT). Variation of pH, electrical conductivity, and electroosmotic flow was evaluated during the EK-Fenton process. The IE treatment showed low removal efficiency for HCHs (30.5%) and DDTs (25.9%). In the EF treatment, the highest removal level (60.9%) was obtained for α-HCH, whereas P,P-DDT was the lowest (40.0%). Low solubility of pollutants impeded the HCH and DDT removal. After enhanced EK-Fenton treatment, final removal of pollutants decreased as follows: β-HCH (82.6%) > γ-HCH (81.6%) > α-HCH (81.2%) > δ-HCH (80.0%) > P,P-DDD (73.8%) > P,P-DDE (73.1%) > P,P-DDT (72.6%) > O,P-DDT (71.5%). The results demonstrate that EK-Fenton is a promising technology for POP removal in historically polluted soil.
土壤中持久性有机污染物（POPs）的污染对全球历史污染土壤构成了巨大威胁。本研究对土壤进行了特征描述，并对土壤中含有的有机氯农药进行了鉴定和定量分析。单独的电动（IE）、EK-Fenton 耦合技术（EF）和强化 EK-Fenton 处理（E-1、E-2 和 E-3）被应用于修复受六氯环己烷 soprocide（HCH）和滴滴涕（DDT）污染的土壤。在 EK-Fenton 过程中评估了 pH 值、电导率和电动渗流的变化。IE 处理对 HCHs（30.5%）和 DDTs（25.9%）的去除效率较低。在 EF 处理中，α-HCH 的去除率最高（60.9%），而 P,P-DDT 的去除率最低（40.0%）。污染物的低溶解度阻碍了 HCH 和 DDT 的去除。在强化 EK-Fenton 处理后，污染物的最终去除率如下：β-HCH（82.6%）>γ-HCH（81.6%）>α-HCH（81.2%）>δ-HCH（80.0%）>P,P-DDD（73.8%）>P,P-DDE（73.1%）>P,P-DDT（72.6%）>O,P-DDT（71.5%）。结果表明，EK-Fenton 是一种有前途的去除历史污染土壤中 POPs 的技术。
