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Engineering enhanced anaerobic digestion: Benefits of ethanol fermentation pretreatment for boosting direct interspecies electron transfer

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  • Zhao, Zhiqiang
  • Li, Yang
  • Zhang, Yaobin

Abstract

Conversion of organic wastes to methane via anaerobic digestion has been practiced for more than 160 years. However, the technical bottlenecks derived from the thermodynamic limitations of interspecies hydrogen/formate transfer (IHT/IFT) between syntrophs and methanogens resulting in the slow fermentation rate, low methane conversion efficiency and poor stability of system still limit its large-scale application. No engineering strategy to speed up IHT/IFT for dramatically changing the performances of anaerobic digestion has been developed. However, recent studies documented that simply pretreating organic wastes to produce ethanol could effectively accelerate and stabilize anaerobic digestion. This may be linked to the promotion of direct interspecies electron transfer (DIET), an alternative working mode that no longer requires hydrogen or formate as an electron carrier. Further information on how this strategy affects the function of methanogenic communities to clarify its advantages is required. In this study, we summarized the evidence that pretreating organic wastes to produce ethanol enhanced anaerobic digestion, discussed the link between ethanol and DIET, and emphasized how this strategy would be better applied in the future.

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  • Zhao, Zhiqiang & Li, Yang & Zhang, Yaobin, 2021. "Engineering enhanced anaerobic digestion: Benefits of ethanol fermentation pretreatment for boosting direct interspecies electron transfer," Energy, Elsevier, vol. 228(C).
    • Handle: RePEc:eee:energy:v:228:y:2021:i:c:s0360544221008926
    DOI: 10.1016/j.energy.2021.120643
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    References listed on IDEAS

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    1. Zhao, Zhiqiang & Zhang, Yaobin, 2019. "Application of ethanol-type fermentation in establishment of direct interspecies electron transfer: A practical engineering case study," Renewable Energy, Elsevier, vol. 136(C), pages 846-855.
    2. Appels, Lise & Lauwers, Joost & Degrève, Jan & Helsen, Lieve & Lievens, Bart & Willems, Kris & Van Impe, Jan & Dewil, Raf, 2011. "Anaerobic digestion in global bio-energy production: Potential and research challenges," Renewable and Sustainable Energy Reviews, Elsevier, vol. 15(9), pages 4295-4301.
    3. Zhao, Zhiqiang & Sun, Cheng & Li, Yang & Peng, Hong & Zhang, Yaobin, 2020. "Upgrading current method of anaerobic co-digestion of waste activated sludge for high-efficiency methanogenesis: Establishing direct interspecies electron transfer via ethanol-type fermentation," Renewable Energy, Elsevier, vol. 148(C), pages 523-533.
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    1. Li, Lei & Xu, Ying & Dai, Xiaohu & Dai, Lingling, 2021. "Principles and advancements in improving anaerobic digestion of organic waste via direct interspecies electron transfer," Renewable and Sustainable Energy Reviews, Elsevier, vol. 148(C).

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