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| Electrokinetically Enhanced Persulfate Remediation of PCBs Polluted Soil |
| Received:February 06, 2015 |
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| KeyWord:persulfate;electrokinetics;polychlorinated biphenyls(PCBs);soil remediation |
| Author Name | Affiliation | E-mail | | FAN Guang-ping | China Construction Power and Environment Engneering Co., Ltd. Nanjing 210008, China
Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | CANG Long | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | LIU De-hong | GCL-Poly Energy Holdings Limited(Power), Suzhou 215028, China | | | ZHOU Dong-mei | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | dmzhou@issas.ac.cn |
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| Abstract: |
| Persulfate-based in situ chemical oxidation(ISCO) is a promising technique for remediation of organic compounds contaminated soil and groundwater. However, its application in low permeability soils is limited due to the ineffective delivery of oxidant in such soils. In this study, remediation of PCBs polluted soil by persulfate combined with electrokinetics(EK) was investigated in laboratory-scale experiments. The effects of persulfate additions to both electrodes, electric field reversal and persulfate activation by alkaline on PCBs degradation were also evaluated. Results showed that adding 10% of persulfate to both electrodes increased the current and electroosmotic flow, which thus favored the delivery of persulfate and enhanced the degradation of PCBs in soil. From the distribution of PCBs residues in soil, it showed that electroosmosis was more effective than electromigration for the transportation of persulfate. The electric field reversal did not significantly facilitate the removal of PCBs in soil due to the depolarization occurred in cathode. The activation of persulfate by alkaline yielded the highest PCBs removal efficiency, with 28.7% of PCBs being removed from soils. The soil heterogeneity and persulfate consumption might be responsible for the low removal of PCBs in soils. |
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