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    The effect of flow modes and electrode combinations on the performance of a multiple module microbial fuel cell installed at wastewater treatment plant

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    Type
    Article
    Authors
    He, Weihua cc
    Wallack, Maxwell J.
    Kim, Kyoung-Yeol
    Zhang, Xiaoyuan cc
    Yang, Wulin
    Zhu, Xiuping
    Feng, Yujie
    Logan, Bruce cc
    KAUST Grant Number
    KUS-I1-003-13
    Date
    2016-09-13
    Online Publication Date
    2016-09-13
    Print Publication Date
    2016-11
    Permanent link to this record
    http://hdl.handle.net/10754/623604
    
    Metadata
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    Abstract
    A larger (6.1 L) MFC stack made in a scalable configuration was constructed with four anode modules and three (two-sided) cathode modules, and tested at a wastewater treatment plant for performance in terms of chemical oxygen demand (COD) removal and power generation. Domestic wastewater was fed either in parallel (raw wastewater to each individual anode module) or series (sequentially through the chambers), with the flow direction either alternated every one or two days or kept fixed in a single direction over time. The largest impact on performance was the wastewater COD concentration, which greatly impacted power production, but did not affect the percentage of COD removal. With higher COD concentrations (∼500 mg L−1) and alternating flow conditions, power generation was primarily limited by the cathode specific area. In alternating flow operation, anode modules connected to two cathodes produced an average maximum power density of 6.0 ± 0.4 W m−3, which was 1.9 ± 0.2 times that obtained for anodes connected to a single cathode. In fixed flow operation, a large subsequent decrease in COD influent concentration greatly reduced power production independent of reactor operation in parallel or serial flow modes. Anode modules connected to two cathodes did not consistently produce more power than the anodes connected to a single cathode, indicating power production became limited by restricted anode performance at low CODs. Cyclic voltammetry and electrochemical impedance spectroscopy data supported restricted anode performance with low COD. These results demonstrate that maintaining power production of MFC stack requires higher influent and effluent COD concentrations. However, overall performance of the MFC in terms of COD removal was not affected by operational modes.
    Citation
    He W, Wallack MJ, Kim K-Y, Zhang X, Yang W, et al. (2016) The effect of flow modes and electrode combinations on the performance of a multiple module microbial fuel cell installed at wastewater treatment plant. Water Research 105: 351–360. Available: http://dx.doi.org/10.1016/j.watres.2016.09.008.
    Sponsors
    The authors thank David Jones for help with the manufacture of the reactor and analytical measurements. This research was supported by the Strategic Environmental Research and Development Program (SERDP), Award KUS-I1-003-13 from the King Abdullah University of Science and Technology (KAUST), the National Natural Science Fund for Distinguished Young Scholars (Grant No. 51125033), the International Cooperating Project between China and European Union (Grant No. 2014DFE90110), National Natural Science Foundation of China (Grant No. 51408336, to X.Z.), and a scholarship (No. 201206120191) to W.H. from the China Scholarship Council (CSC).
    Publisher
    Elsevier BV
    Journal
    Water Research
    DOI
    10.1016/j.watres.2016.09.008
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.watres.2016.09.008
    Scopus Count
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