Boosting biomethane yield and production rate with graphene: The potential of direct interspecies electron transfer in anaerobic digestion

Bioresource Technology
Richen LinJerry D Murphy

Abstract

Interspecies electron transfer between bacteria and archaea plays a vital role in enhancing energy efficiency of anaerobic digestion (AD). Conductive carbon materials (i.e. graphene nanomaterial and activated charcoal) were assessed to enhance AD of ethanol (a key intermediate product after acidogenesis of algae). The addition of graphene (1.0g/L) resulted in the highest biomethane yield (695.0±9.1mL/g) and production rate (95.7±7.6mL/g/d), corresponding to an enhancement of 25.0% in biomethane yield and 19.5% in production rate. The ethanol degradation constant was accordingly improved by 29.1% in the presence of graphene. Microbial analyses revealed that electrogenic bacteria of Geobacter and Pseudomonas along with archaea Methanobacterium and Methanospirillum might participate in direct interspecies electron transfer (DIET). Theoretical calculations provided evidence that graphene-based DIET can sustained a much higher electron transfer flux than conventional hydrogen transfer.

Citations

Feb 6, 2020·Frontiers in Microbiology·Kensuke IgarashiSouichiro Kato
Jun 8, 2018·MicrobiologyOpen·Souichiro Kato, Kensuke Igarashi
Dec 10, 2020·IScience·Tian Zhang, Pier-Luc Tremblay
Jan 17, 2021·Trends in Biotechnology·Richen LinJerry D Murphy
Sep 18, 2017·Bioresource Technology·Yamrot M AmhaAdam L Smith
Feb 14, 2018·Bioresource Technology·Qing DongChen Lu
Mar 21, 2021·Bioresource Technology·Wei Wang, Duu-Jong Lee
Jul 18, 2020·Environmental Research·Qian ChenDawn E Holmes
Mar 26, 2021·Bioresource Technology·Qiuxian QiYen Wah Tong
Mar 29, 2021·The Science of the Total Environment·Najiaowa YuYang Liu
Aug 9, 2021·Biotechnology Advances·Dong FengJerry D Murphy
Aug 18, 2018·Environmental Science & Technology·Gilberto MartinsM Madalena Alves
Aug 11, 2020·Journal of Colloid and Interface Science·Na ZhouZhanhu Guo
Jan 20, 2020·The Science of the Total Environment·Wende MaYuanpeng Wang

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