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Open AccessFeature PaperArticle

Electric Field-Driven Direct Interspecies Electron Transfer for Bioelectrochemical Methane Production from Fermentable and Non-Fermentable Substrates

1
Department of Environmental Engineering, Korea Maritime and Ocean University, 727 Taejong-ro, Yeongdo-Gu, Busan 49112, Korea
2
Department of Environmental Engineering, Daejeon University, 62 Daehak-ro, Dong-Gu, Daejeon 34520, Korea
3
Department of Civil and Environmental Engineering, The University of Suwon, 17 Wauan-gil, Bongdam-eup, Hwaseong-si 18323, Korea
*
Author to whom correspondence should be addressed.
Processes 2020, 8(10), 1293; https://doi.org/10.3390/pr8101293
Received: 24 August 2020 / Revised: 5 October 2020 / Accepted: 13 October 2020 / Published: 15 October 2020
(This article belongs to the Special Issue Development and Applications of Bioelectrochemical Systems)
The bioelectrochemical methane production from acetate as a non-fermentable substrate, glucose as a fermentable substrate, and their mixture were investigated in an anaerobic sequential batch reactor exposed to an electric field. The electric field enriched the bulk solution with exoelectrogenic bacteria (EEB) and electrotrophic methanogenic archaea, and promoted direct interspecies electron transfer (DIET) for methane production. However, bioelectrochemical methane production was dependent on the substrate characteristics. For acetate as the substrate, the main electron transfer pathway for methane production was DIET, which significantly improved methane yield up to 305.1 mL/g chemical oxygen demand removed (CODr), 77.3% higher than that in control without the electric field. For glucose, substrate competition between EEB and fermenting bacteria reduced the contribution of DIET to methane production, resulting in the methane yield of 288.0 mL/g CODr, slightly lower than that of acetate. In the mixture of acetate and glucose, the contribution of DIET to methane production was less than that of the single substrate, acetate or glucose, due to the increase in the electron equivalent for microbial growth. The findings provide a better understanding of electron transfer pathways, biomass growth, and electron transfer losses depending on the properties of substrates in bioelectrochemical methane production. View Full-Text
Keywords: direct interspecies electron transfer; fermentable substrate; non-fermentable substrate; bioelectrochemical methane production direct interspecies electron transfer; fermentable substrate; non-fermentable substrate; bioelectrochemical methane production
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MDPI and ACS Style

Oh, G.-G.; Song, Y.-C.; Bae, B.-U.; Lee, C.-Y. Electric Field-Driven Direct Interspecies Electron Transfer for Bioelectrochemical Methane Production from Fermentable and Non-Fermentable Substrates. Processes 2020, 8, 1293.

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