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Anaerobic/aerobic conditions and biostimulation for enhanced chlorophenols degradation in biocathode microbial fuel cells

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Abstract

Anaerobic/aerobic conditions affected bacterial community composition and the subsequent chlorophenols (CPs) degradation in biocathode microbial fuel cells (MFCs). Bacterial communities acclimated with either 4-chlorophenol (4-CP) or 2,4-dichlorophenol (2,4-DCP) under anaerobiosis can degrade the respective substrates more efficiently than the facultative aerobic bacterial communities. The anaerobic bacterial communities well developed with 2,4-DCP were then adapted to 2,4,6-trichlorophenol (2,4,6-TCP) and successfully stimulated for enhanced 2,4,6-TCP degradation and power generation. A 2,4,6-TCP degradation rate of 0.10 mol/m3/d and a maximum power density of 2.6 W/m3 (11.7 A/m3) were achieved, 138 and 13 % improvements, respectively compared to the controls with no stimulation. Bacterial communities developed with the specific CPs under anaerobic/aerobic conditions as well as the stimulated biofilm shared some dominant genera and also exhibited great differences. These results provide the most convincing evidence to date that anaerobic/aerobic conditions affected CPs degradation with power generation from the biocathode systems, and using deliberate substrates can stimulate the microbial consortia and be potentially feasible for the selection of an appropriate microbial community for the target substrate (e.g. 2,4,6-TCP) degradation in the biocathode MFCs.

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Acknowledgments

The authors gratefully acknowledge financial support from the Natural Science Foundation of China (Nos. 21077017 and 51178077) and Specialized Research Fund for the Doctoral Program of Higher Education “SRFDP” (No. 20120041110026).

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Authors and Affiliations

  1. Key Laboratory of Industrial Ecology and Environmental Engineering, Ministry of Education (MOE), School of Environmental Science and Technology, Dalian University of Technology, Dalian, 116024, China

    Liping Huang & Ning Wang

  2. Weihai Supervision and Inspection Institute of Product Quality, Weihai, 264200, China

    Yinghong Shi

  3. School of Life Science and Biotechnology, Dalian University of Technology, Dalian, 116024, China

    Yuesheng Dong

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  1. Liping Huang
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Huang, L., Shi, Y., Wang, N. et al. Anaerobic/aerobic conditions and biostimulation for enhanced chlorophenols degradation in biocathode microbial fuel cells. Biodegradation 25, 615–632 (2014). https://doi.org/10.1007/s10532-014-9686-1

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