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    Effects of constant or dynamic low anode potentials on microbial community development in bioelectrochemical systems

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    Type
    Article
    Authors
    Yan, Hengjing
    Yates, Matthew D.
    Regan, John M.
    KAUST Grant Number
    KUS-I1-003-13
    Date
    2015
    Permanent link to this record
    http://hdl.handle.net/10754/673087
    
    Metadata
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    Abstract
    In bioelectrochemical systems, exoelectrogenic bacteria respire with anode electrodes as their extracellular electron acceptor; therefore, lower anode potentials can reduce the energy gain to each microbe and select against ones that are not able to respire at a lower potential range. Often fully developed anode communities are compared across bioelectrochemical systems with set anode potentials or fixed external resistances as different operational conditions. However, the comparative effect of the resulting constantly low versus dynamically low anode potentials on the development of anode microbial communities as well as the final cathode microbial communities has not been directly demonstrated. In this study, we used a low fixed anode potential of −250 mV and a higher-current control potential of −119 mV vs. Standard Hydrogen Electrode to approximately correspond with the negative peak anode potential values obtained from microbial fuel cells operated with fixed external resistances of 1 kΩ and 47 Ω, respectively. Pyrosequencing data from a 2-month time series show that a lower set anode potential resulted in a more diverse community than the higher- and variable-potential systems, likely due to the hindered enrichment of a Geobacter-dominated community with limited energy gain at this set potential. In this case, it appears that the selective pressure caused by the low set potential was counteracted by the low energy gain over a 2-month time scale. The air cathode microbial community with constant low anode potentials showed delayed enrichment of denitrifiers or perchlorate-reducing bacteria compared to the fixed external resistance condition.
    Citation
    Yan, H., Yates, M. D., & Regan, J. M. (2015). Effects of constant or dynamic low anode potentials on microbial community development in bioelectrochemical systems. Applied Microbiology and Biotechnology, 99(21), 9319–9329. doi:10.1007/s00253-015-6907-4
    Sponsors
    We acknowledge Dr. Justin Tokash's advice on potentiostatic operation. Financial support under King Abdullah University of Science and Technology (KAUST) KUS-I1-003-13 and Army Research Office Equipment Grant W911NF-11-1-0410 are gratefully acknowledged.
    Publisher
    SPRINGER
    Journal
    APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
    DOI
    10.1007/s00253-015-6907-4
    Additional Links
    http://link.springer.com/10.1007/s00253-015-6907-4
    ae974a485f413a2113503eed53cd6c53
    10.1007/s00253-015-6907-4
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