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    Addition of a carbon fiber brush improves anaerobic digestion compared to external voltage application

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    Type
    Article
    Authors
    Baek, Gahyun cc
    Saikaly, Pascal cc
    Logan, Bruce cc
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Environmental Biotechnology Research Group
    Environmental Science and Engineering Program
    Water Desalination and Reuse Research Center (WDRC)
    Date
    2020-10-26
    Online Publication Date
    2020-10-26
    Print Publication Date
    2021-01
    Embargo End Date
    2022-10-26
    Submitted Date
    2020-09-03
    Permanent link to this record
    http://hdl.handle.net/10754/665681
    
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    Abstract
    Two methods were examined to improve methane production efficiency in anaerobic digestion (AD) based on adding a large amount of surface area using a single electrically conductive carbon brush, or by adding electrodes as done in microbial electrolysis cells (MECs) to form a hybrid AD-MEC. To examine the impact of surface area relative to electrodes, AD reactors were fitted with a single large brush without electrodes (FB), half a large brush with two electrodes with an applied voltage (0.8 V) and operated in closed circuit (HB-CC) or open circuit (HB-OC) mode, or only two electrodes with a closed circuit and no large brush (NB-CC) (equivalent to an MEC). The three configurations with a half or full brush all had improved performance as shown by 57-82% higher methane generation rate parameters in the Gompertz model compared to NB-CC. The retained biomass was much higher in the reactors with large brush, which likely contributed to the rapid consumption of volatile fatty acids (VFAs) and therefore improved AD performance. A different microbial community structure was formed in the large-size brushes compared to the electrodes. Methanothrix was predominant in the biofilm of large-size carbon brush, while Geobacter (anode) and Methanobacterium (cathode) were highly abundant in the electrode biofilms. These results demonstrate that adding a high surface area carbon fiber brush will be a more effective method of improving AD performance than using MEC electrodes with an applied potential.
    Citation
    Baek, G., Saikaly, P. E., & Logan, B. E. (2020). Addition of a carbon fiber brush improves anaerobic digestion compared to external voltage application. Water Research, 116575. doi:10.1016/j.watres.2020.116575
    Sponsors
    This research was funded by the Stan and Flora Kappe endowment and other funds through The Pennsylvania State University.
    Publisher
    Elsevier BV
    Journal
    Water Research
    DOI
    10.1016/j.watres.2020.116575
    Additional Links
    https://linkinghub.elsevier.com/retrieve/pii/S0043135420311106
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.watres.2020.116575
    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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