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Anoxic biodegradation of triclosan and the removal of its antimicrobial effect in microbial fuel cells.
Journal of Hazardous Materials 2018 Februrary 16
Triclosan (TCS) is an emerging organic contaminant in the environment. Here, the anoxic bio-degradation of TCS in microbial fuel cells (MFCs) was explored. It was found that anoxic biodegradation of TCS could be achieved in MFC, and the removal rate of TCS was accelerated after reactor acclimation. After 7 months of operation, 10mg/L TCS could be removed within 8days in MFCs. Fluorescence microscopy results revealed that the microbe cells in the reactors were intact, and the microbes were in active state. Flow cytometry test showed that the proliferation of inoculated microbe was higher in MFC effluent than that in TCS solution. These data indicate that the biotoxicity of TCS has been largely eliminated after the treatment. The microbial community shift during the TCS degradation process was investigated as well. Species such as Geothrix, Corynebacterium, Sulfobacillus, GOUTA19, Geobacter, Acidithiobacillus and Acinetobacter, which were capable for the degradation of benzene-related and dechlorination of chlorine-containing chemicals, were flourished in the electrode biofilm. They may participate in the biodegradation of TCS. This work provides a new perspective for the anoxic biodegradation of recalcitrant organics, and can be useful for the in-situ bioremediation of environmental pollutants with the removal of their biotoxicity.
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