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Changes of Bacterial Communities in an Anaerobic Digestion and a Bio-Electrochemical Anaerobic Digestion Reactors According to Organic Load

Author

Listed:
  • Jun-Gyu Park

    (Department of Environmental Engineering, Chungbuk National University, Cheongju 361-763, Korea)

  • Won-Beom Shin

    (Department of Environmental Engineering, Chungbuk National University, Cheongju 361-763, Korea)

  • Wei-Qi Shi

    (Department of Environmental Engineering, Chungbuk National University, Cheongju 361-763, Korea)

  • Hang-Bae Jun

    (Department of Environmental Engineering, Chungbuk National University, Cheongju 361-763, Korea)

Abstract

Bacterial communities change in bulk solution of anaerobic digestion (AD) and bio-electrochemical anaerobic digestion reactors (BEAD) were monitored at each organic loading rate (OLR) to investigate the effect of voltage supply on bacterial species change in bulk solution. Chemical oxygen demand (COD) degradation and methane production from AD and BEAD reactors were also analyzed by gradually increasing food waste OLR. The BEAD reactor maintained stable COD removal and methane production at 6.0 kg/m 3 ·d. The maximum OLR of AD reactor for optimal operation was 4.0 kg/m 3 ·d. pH and alkalinity decline and volatile fatty acid (VFA) accumulation, which are the problem in high load anaerobic digestion of readily decomposable food wastes, were again the major factors destroying the optimal operation condition of the AD reactor at 6.0 kg/m 3 ·d. Contrarily, the electrochemically activated dense communities of exoelectrogenic bacteria and VFA-oxidizing bacteria prevented VFAs from accumulating inside the BEAD reactor. This maintained stable pH and alkalinity conditions, ultimately contributing to stable methane production.

Suggested Citation

  • Jun-Gyu Park & Won-Beom Shin & Wei-Qi Shi & Hang-Bae Jun, 2019. "Changes of Bacterial Communities in an Anaerobic Digestion and a Bio-Electrochemical Anaerobic Digestion Reactors According to Organic Load," Energies, MDPI, vol. 12(15), pages 1-11, August.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:15:p:2958-:d:253608
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    References listed on IDEAS

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    Cited by:

    1. Eui-Hwan Hong & Jun-Gyu Park & Beom Lee & Wei-Qi Shi & Hang-Bae Jun, 2019. "Improvement of Waste Dehydrated Sludge for Anaerobic Digestion through High-Temperature and High-Pressure Solubilization," Energies, MDPI, vol. 13(1), pages 1-16, December.
    2. Miriam Cerrillo & Laura Burgos & August Bonmatí, 2021. "Biogas Upgrading and Ammonia Recovery from Livestock Manure Digestates in a Combined Electromethanogenic Biocathode—Hydrophobic Membrane System," Energies, MDPI, vol. 14(2), pages 1-12, January.
    3. Ding, Lingkan & Wang, Yuchuan & Lin, Hongjian & van Lierop, Leif & Hu, Bo, 2022. "Facilitating solid-state anaerobic digestion of food waste via bio-electrochemical treatment," Renewable and Sustainable Energy Reviews, Elsevier, vol. 166(C).

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