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Community Structure Analyses of Anodic Biofilms in a Bioelectrochemical System Combined with an Aerobic Reactor

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  • Qiaochu Liang

    (Graduate School of Nature Science and Technology, Kanazawa University, Kakuma-machi Kanazawa, Ishikawa 920-1192, Japan)

  • Takahiro Yamashita

    (Division of Animal Environment and Waste Management Research, Institute of Livestock and Grassland Science, National Agriculture and Food Research Organization (NARO), 2 Ikenodai, Tsukuba 305-0901, Japan)

  • Norihisa Matsuura

    (Faculty of Geoscience and Civil Engineering, Institute of Science and Engineering, Kanazawa University, Kakumamachi Kanazawa, Ishikawa 920-1192, Japan)

  • Ryoko Yamamoto-Ikemoto

    (Faculty of Geoscience and Civil Engineering, Institute of Science and Engineering, Kanazawa University, Kakumamachi Kanazawa, Ishikawa 920-1192, Japan)

  • Hiroshi Yokoyama

    (Division of Animal Environment and Waste Management Research, Institute of Livestock and Grassland Science, National Agriculture and Food Research Organization (NARO), 2 Ikenodai, Tsukuba 305-0901, Japan)

Abstract

Bioelectrochemical system (BES)-based reactors have a limited range of use, especially in aerobic conditions, because these systems usually produce current from exoelectrogenic bacteria that are strictly anaerobic. However, some mixed cultures of bacteria in aerobic reactors can form surface biofilms that may produce anaerobic conditions suitable for exoelectrogenic bacteria to thrive. In this study, we combined a BES with an aerobic trickling filter (TF) reactor for wastewater treatment and found that the BES-TF setup could produce electricity with a coulombic efficiency of up to 15% from artificial wastewater, even under aerobic conditions. The microbial communities within biofilms formed at the anodes of BES-TF reactors were investigated using high throughput 16S rRNA gene sequencing. Efficiency of reduction in chemical oxygen demand and total nitrogen content of wastewater using this system was >97%. Bacterial community analysis showed that exoelectrogenic bacteria belonging to the genera Geobacter and Desulfuromonas were dominant within the biofilm coating the anode, whereas aerobic bacteria from the family Rhodocyclaceae were abundant on the surface of the biofilm. Based on our observations, we suggest that BES-TF reactors with biofilms containing aerobic bacteria and anaerobic exoelectrogenic bacteria on the anodes can function in aerobic environments.

Suggested Citation

  • Qiaochu Liang & Takahiro Yamashita & Norihisa Matsuura & Ryoko Yamamoto-Ikemoto & Hiroshi Yokoyama, 2019. "Community Structure Analyses of Anodic Biofilms in a Bioelectrochemical System Combined with an Aerobic Reactor," Energies, MDPI, vol. 12(19), pages 1-13, September.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:19:p:3643-:d:270200
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    References listed on IDEAS

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