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    A novel anaerobic electrochemical membrane bioreactor (AnEMBR) with conductive hollow-fiber membrane for treatment of low-organic strength solutions

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    Type
    Article
    Authors
    Katuri, Krishna
    Werner, Craig M.
    Jimenez Sandoval, Rodrigo J.
    Chen, Wei
    Jeon, Sungil
    Logan, Bruce E.
    Lai, Zhiping cc
    Amy, Gary L.
    Saikaly, Pascal cc
    KAUST Department
    Advanced Membranes and Porous Materials Research Center
    Biological and Environmental Sciences and Engineering (BESE) Division
    Chemical Engineering Program
    Environmental Biotechnology Research Group
    Environmental Science and Engineering Program
    Office of the VP
    Physical Science and Engineering (PSE) Division
    Water Desalination and Reuse Research Center (WDRC)
    Date
    2014-10-22
    Online Publication Date
    2014-10-22
    Print Publication Date
    2014-11-04
    Permanent link to this record
    http://hdl.handle.net/10754/563843
    
    Metadata
    Show full item record
    Abstract
    A new anaerobic treatment system that combined a microbial electrolysis cell (MEC) with membrane filtration using electrically conductive, porous, nickel-based hollow-fiber membranes (Ni-HFMs) was developed to treat low organic strength solution and recover energy in the form of biogas. This new system is called an anaerobic electrochemical membrane bioreactor (AnEMBR). The Ni-HFM served the dual function as the cathode for hydrogen evolution reaction (HER) and the membrane for filtration of the effluent. The AnEMBR system was operated for 70 days with synthetic acetate solution having a chemical oxygen demand (COD) of 320 mg/L. Removal of COD was >95% at all applied voltages tested. Up to 71% of the substrate energy was recovered at an applied voltage of 0.7 V as methane rich biogas (83% CH4; < 1% H2) due to biological conversion of the hydrogen evolved at the cathode to methane. A combination of factors (hydrogen bubble formation, low cathode potential and localized high pH at the cathode surface) contributed to reduced membrane fouling in the AnEMBR compared to the control reactor (open circuit voltage). The net energy required to operate the AnEMBR system at an applied voltage of 0.7 V was significantly less (0.27 kWh/m3) than that typically needed for wastewater treatment using aerobic membrane bioreactors (1-2 kWh/m3).
    Citation
    Katuri, K. P., Werner, C. M., Jimenez-Sandoval, R. J., Chen, W., Jeon, S., Logan, B. E., … Saikaly, P. E. (2014). A Novel Anaerobic Electrochemical Membrane Bioreactor (AnEMBR) with Conductive Hollow-fiber Membrane for Treatment of Low-Organic Strength Solutions. Environmental Science & Technology, 48(21), 12833–12841. doi:10.1021/es504392n
    Publisher
    American Chemical Society (ACS)
    Journal
    Environmental Science & Technology
    DOI
    10.1021/es504392n
    PubMed ID
    25310368
    ae974a485f413a2113503eed53cd6c53
    10.1021/es504392n
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Advanced Membranes and Porous Materials Research Center; Environmental Science and Engineering Program; Physical Science and Engineering (PSE) Division; Chemical Engineering Program; Water Desalination and Reuse Research Center (WDRC)

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