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    COD removal characteristics in air-cathode microbial fuel cells

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    Type
    Article
    Authors
    Zhang, Xiaoyuan cc
    He, Weihua cc
    Ren, Lijiao
    Stager, Jennifer
    Evans, Patrick J.
    Logan, Bruce E.
    KAUST Grant Number
    KUS-I1-003-13
    Date
    2015-01
    Permanent link to this record
    http://hdl.handle.net/10754/597792
    
    Metadata
    Show full item record
    Abstract
    © 2014 Elsevier Ltd. Exoelectrogenic microorganisms in microbial fuel cells (MFCs) compete with other microorganisms for substrate. In order to understand how this affects removal rates, current generation, and coulombic efficiencies (CEs), substrate removal rates were compared in MFCs fed a single, readily biodegradable compound (acetate) or domestic wastewater (WW). Removal rates based on initial test conditions fit first-order kinetics, but rate constants varied with circuit resistance. With filtered WW (100Ω), the rate constant was 0.18h- 1, which was higher than acetate or filtered WW with an open circuit (0.10h- 1), but CEs were much lower (15-24%) than acetate. With raw WW (100Ω), COD removal proceeded in two stages: a fast removal stage with high current production, followed by a slower removal with little current. While using MFCs increased COD removal rate due to current generation, secondary processes will be needed to reduce COD to levels suitable for discharge.
    Citation
    Zhang X, He W, Ren L, Stager J, Evans PJ, et al. (2015) COD removal characteristics in air-cathode microbial fuel cells. Bioresource Technology 176: 23–31. Available: http://dx.doi.org/10.1016/j.biortech.2014.11.001.
    Sponsors
    The authors thank David Jones for laboratory support and Mark Ullery for discussions on domestic wastewater COD removal rates. This research was supported by Strategic Environmental Research and Development Program (SERDP), Award KUS-I1-003-13 from the King Abdullah University of Science and Technology (KAUST) and National Natural Science Foundation of China (Grant No. 51408336).
    Publisher
    Elsevier BV
    Journal
    Bioresource Technology
    DOI
    10.1016/j.biortech.2014.11.001
    PubMed ID
    25460980
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.biortech.2014.11.001
    Scopus Count
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