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    Syntrophic interactions improve power production in formic acid fed MFCs operated with set anode potentials or fixed resistances

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    Type
    Article
    Authors
    Sun, Dan
    Call, Douglas F.
    Kiely, Patrick D.
    Wang, Aijie
    Logan, Bruce E.
    KAUST Grant Number
    KUS-I1-003-13
    Date
    2011-10-24
    Online Publication Date
    2011-10-24
    Print Publication Date
    2012-02
    Permanent link to this record
    http://hdl.handle.net/10754/599611
    
    Metadata
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    Abstract
    Formic acid is a highly energetic electron donor but it has previously resulted in low power densities in microbial fuel cells (MFCs). Three different set anode potentials (-0.30, -0.15, and +0.15V; vs. a standard hydrogen electrode, SHE) were used to evaluate syntrophic interactions in bacterial communities for formic acid degradation relative to a non-controlled, high resistance system (1,000Ω external resistance). No current was generated at -0.30V, suggesting a lack of direct formic acid oxidation (standard reduction potential: -0.40V). More positive potentials that allowed for acetic acid utilization all produced current, with the best performance at -0.15V. The anode community in the -0.15V reactor, based on 16S rDNA clone libraries, was 58% Geobacter sulfurreducens and 17% Acetobacterium, with lower proportions of these genera found in the other two MFCs. Acetic acid was detected in all MFCs suggesting that current generation by G. sulfurreducens was dependent on acetic acid production by Acetobacterium. When all MFCs were subsequently operated at an external resistance for maximum power production (100Ω for MFCs originally set at -0.15 and +0.15V; 150Ω for the control), they produced similar power densities and exhibited the same midpoint potential of -0.15V in first derivative cyclic voltammetry scans. All of the mixed communities converged to similar proportions of the two predominant genera (ca. 52% G. sulfurreducens and 22% Acetobacterium). These results show that syntrophic interactions can be enhanced through setting certain anode potentials, and that long-term performance produces stable and convergent communities. © 2011 Wiley Periodicals, Inc.
    Citation
    Sun D, Call DF, Kiely PD, Wang A, Logan BE (2011) Syntrophic interactions improve power production in formic acid fed MFCs operated with set anode potentials or fixed resistances. Biotechnology and Bioengineering 109: 405–414. Available: http://dx.doi.org/10.1002/bit.23348.
    Sponsors
    Contract grant sponsor: King Abdullah University of Science and Technology (KAUST)Contract grant number: KUS-I1-003-13Contract grant sponsor: National Science Foundation Graduate Research FellowshipContract grant sponsor: China Scholarship Council (CSC)
    Publisher
    Wiley
    Journal
    Biotechnology and Bioengineering
    DOI
    10.1002/bit.23348
    PubMed ID
    22006545
    ae974a485f413a2113503eed53cd6c53
    10.1002/bit.23348
    Scopus Count
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