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    Effect of pre-acclimation of granular activated carbon on microbial electrolysis cell startup and performance

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    Type
    Article
    Authors
    LaBarge, Nicole
    Yilmazel, Yasemin Dilsad
    Hong, Pei-Ying cc
    Logan, Bruce E.
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Environmental Science and Engineering Program
    Water Desalination and Reuse Research Center (WDRC)
    Date
    2016-09-09
    Online Publication Date
    2016-09-09
    Print Publication Date
    2017-02
    Permanent link to this record
    http://hdl.handle.net/10754/622190
    
    Metadata
    Show full item record
    Abstract
    Microbial electrolysis cells (MECs) can generate methane by fixing carbon dioxide without using expensive catalysts, but the impact of acclimation procedures on subsequent performance has not been investigated. Granular activated carbon (GAC) was used to pre-enrich electrotrophic methanogenic communities, as GAC has been shown to stimulate direct transfer of electrons between different microbial species. MEC startup times using pre-acclimated GAC were improved compared to controls (without pre-acclimation or without GAC), and after three fed batch cycles methane generation rates were similar (P > 0.4) for GAC acclimated to hydrogen (22 ± 9.3 nmol cm− 3 d− 1), methanol (25 ± 9.7 nmol cm− 3 d− 1), and a volatile fatty acid (VFA) mix (22 ± 11 nmol cm− 3 d− 1). However, MECs started with GAC but no pre-acclimation had lower methane generation rates (13 ± 4.1 nmol cm− 3 d− 1), and MECs without GAC had the lowest rates (0.7 ± 0.8 nmol cm− 3 d− 1 after cycle 2). Microbes previously found in methanogenic MECs, or previously shown to be capable of exocellular electron transfer, were enriched on the GAC. Pre-acclimation using GAC is therefore a simple approach to enrich electroactive communities, improve methane generation rates, and decrease startup times in MECs. © 2016 Elsevier B.V.
    Citation
    LaBarge N, Yilmazel YD, Hong P-Y, Logan BE (2017) Effect of pre-acclimation of granular activated carbon on microbial electrolysis cell startup and performance. Bioelectrochemistry 113: 20–25. Available: http://dx.doi.org/10.1016/j.bioelechem.2016.08.003.
    Publisher
    Elsevier BV
    Journal
    Bioelectrochemistry
    DOI
    10.1016/j.bioelechem.2016.08.003
    PubMed ID
    27622557
    Additional Links
    http://www.sciencedirect.com/science/article/pii/S1567539416301062
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.bioelechem.2016.08.003
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Environmental Science and Engineering Program; Water Desalination and Reuse Research Center (WDRC)

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