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摘要
A sediment-based bio-electrochemical reactor was established for remediation of polychlorinated biphenyl (PCB)-contaminated sediment, which was collected from a river at an e-waste recycling center in Longtang town, Qingyuan, Guangdong province. The effects of different applied potential (e. g., -0.1, -0. 3, -0.5 and -0. 7 V vs. saturated calomel electrode, SCE) on the rate and extent of reductive dechlorination of PCB 61 were investigated and the relevant bacterial communities enriched in the systems were analyzed. An open-circuit reactor was also constructed for comparison. The results showed that the stimulation of a potential of -0.7 V enabled the highest removal efficiency, with 59.05% achieved after 24 weeks, larger than 32.22% associated with the open-circuit reactor. The smaller the potential value, the higher the reduced dechlorination rate of the PCB 61 within the investigated potential range. Analysis of the bacterial composition showed significant community shifts in response to variations in treatment conditions. The electric stimulation significantly increased the abundance of electrochemical active bacteria like Geobacter and Ignavibacterium and enhanced the amount of methanogen like Methanosarcina and Methanosaeta. The species interaction between them might play an important role in PCB 61 dechlorination.
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