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    Multiple paths of electron flow to current in microbial electrolysis cells fed with low and high concentrations of propionate

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    Type
    Article
    Authors
    Rao, Hari Ananda cc
    Katuri, Krishna
    Gorron, Eduardo
    Logan, Bruce E.
    Saikaly, Pascal cc
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Chemical and Biological Engineering Program
    Environmental Science and Engineering Program
    Water Desalination and Reuse Research Center (WDRC)
    KAUST Grant Number
    FCC/1/1971-05-01
    GRP-CF-2011-15-S
    Date
    2016-03-03
    Online Publication Date
    2016-03-03
    Print Publication Date
    2016-07
    Permanent link to this record
    http://hdl.handle.net/10754/621478
    
    Metadata
    Show full item record
    Abstract
    Microbial electrolysis cells (MECs) provide a viable approach for bioenergy generation from fermentable substrates such as propionate. However, the paths of electron flow during propionate oxidation in the anode of MECs are unknown. Here, the paths of electron flow involved in propionate oxidation in the anode of two-chambered MECs were examined at low (4.5 mM) and high (36 mM) propionate concentrations. Electron mass balances and microbial community analysis revealed that multiple paths of electron flow (via acetate/H2 or acetate/formate) to current could occur simultaneously during propionate oxidation regardless of the concentration tested. Current (57–96 %) was the largest electron sink and methane (0–2.3 %) production was relatively unimportant at both concentrations based on electron balances. At a low propionate concentration, reactors supplemented with 2-bromoethanesulfonate had slightly higher coulombic efficiencies than reactors lacking this methanogenesis inhibitor. However, an opposite trend was observed at high propionate concentration, where reactors supplemented with 2-bromoethanesulfonate had a lower coulombic efficiency and there was a greater percentage of electron loss (23.5 %) to undefined sinks compared to reactors without 2-bromoethanesulfonate (11.2 %). Propionate removal efficiencies were 98 % (low propionate concentration) and 78 % (high propionate concentration). Analysis of 16S rRNA gene pyrosequencing revealed the dominance of sequences most similar to Geobacter sulfurreducens PCA and G. sulfurreducens subsp. ethanolicus. Collectively, these results provide new insights on the paths of electron flow during propionate oxidation in the anode of MECs fed with low and high propionate concentrations.
    Citation
    Hari AR, Katuri KP, Gorron E, Logan BE, Saikaly PE (2016) Multiple paths of electron flow to current in microbial electrolysis cells fed with low and high concentrations of propionate. Applied Microbiology and Biotechnology 100: 5999–6011. Available: http://dx.doi.org/10.1007/s00253-016-7402-2.
    Sponsors
    This work was sponsored by a Ph.D. fellowship, a Global Research Partnership-Collaborative Fellows Award (GRP-CF-2011-15-S), and Center Competitive Funding (FCC/1/1971-05-01) to P.E.S. from King Abdullah University of Science and Technology (KAUST). Special thanks are extended to Bioscience Core Laboratory at KAUST for 454 pyrosequencing.
    Publisher
    Springer Nature
    Journal
    Applied Microbiology and Biotechnology
    DOI
    10.1007/s00253-016-7402-2
    PubMed ID
    26936773
    ae974a485f413a2113503eed53cd6c53
    10.1007/s00253-016-7402-2
    Scopus Count
    Collections
    Articles; Biological and Environmental Sciences and Engineering (BESE) Division; Environmental Science and Engineering Program; Chemical Engineering Program; Water Desalination and Reuse Research Center (WDRC)

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