• 关键词：多氯联苯  电动修复  铁/碳复合材料  过硫酸盐  土壤污染

• 基金项目：国家重点研发计划（No.2017YFA0207003）；国家自然科学基金（No.21621005）；浙江省科技计划项目（No.2020C03011）；浙江省自然科学基金（No.LD21B070001）

• 宋艳
• 浙江大学环境科学系，杭州 310058

• 林道辉
• 浙江大学环境科学系，杭州 310058

• 摘要：研究了3种浓度过硫酸盐溶液（2、20和200 g·L^-1，以下分别表示为0.2%、2%、20%）作为电解液对电动-铁/碳复合材料（EK-Fe/C）联合修复多氯联苯（PCBs）污染土壤的强化作用，并探究了EK-Fe/C-PS修复技术对土壤理化性质的影响.结果表明，EK-Fe/C-PS修复7 d后，土壤温度和可溶性有机质含量增加，pH显著降低，电导率下降.PS对EK-Fe/C联合修复PCB28污染土壤具有显著的强化作用，修复效果整体随PS浓度增加而增加.在PS浓度为20%时，PCB28的7 d平均去除效率最高（60.9%），是EK-Fe/C处理组（20.5%）的3倍，EK-20%PS处理组（32.0%）的 近2倍.阳极侧土壤PCB28去除效率显著高于阴极侧，达到92.7%±7.7%.在两个电极中间区域，PS浓度增加对修复效果的影响不显著.为降低修复成本和对土壤的影响，污染土壤修复实践中可先使用高浓度PS快速修复阳极和阴极侧土壤，再使用低浓度PS强化修复中间区域土壤.

• Abstract：In this study， three concentrations of persulfate （PS： 0.2%， 2%， and 20%） were used as electrolytes to investigate their enhancement effects on the electrokinetic-iron/carbon composite （EK-Fe/C） co-remediation of polychlorinated biphenyls- （PCBs-） contaminated soil； the effects of EK-Fe/C-PS remediation on selected soil physicochemical properties were also investigated. The results showed that after 7 days of EK-Fe/C-PS remediation soil temperature and dissolved organic matter content increased， whereas soil pH and electrical conductivity decreased. PS treatment markedly enhanced the remediation efficiency of PCB28-contaminated soil by EK-Fe/C， and the enhancement overall increased with increasing concentration of PS. When the PS concentration was 20%， the 7 day PCB28 removal efficiency was the highest （60.9%）， which was about three and two times of that of EK-Fe/C （20.5%） and EK-20%PS （32.0%） treatments， respectively. The removal rate of soil PCB28 at the anode side in the EK-Fe/C-PS treatment was significantly and markedly higher than that at the cathode side， reaching 92.7%±7.7%. In the middle zone between the two electrode sides， the increase in PS concentration had insignificant effect on the removal of soil PCBs. In order to reduce the cost and soil impact of remediation practice， high concentration PS can be used at the first to quickly remediate soil at the electrode sides， and then low concentration PS can be used to intensify the middle zone remediation.

• Key words：polychlorinated biphenyls  electrokinetic remediation  iron-carbon material  persulfate  soil pollution

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