Direct Interspecies Electron Transfer in Anaerobic Digestion: A Review

Advances in Biochemical Engineering/biotechnology
Charles-David Dubé, Serge R Guiot

Abstract

Direct interspecies electrons transfer (DIET) is a syntrophic metabolism in which free electrons flow from one cell to another without being shuttled by reduced molecules such as molecular hydrogen or formate. As more and more microorganisms show a capacity for electron exchange, either to export or import them, it becomes obvious that DIET is a syntrophic metabolism that is much more present in nature than previously thought. This article reviews literature related to DIET, specifically in reference to anaerobic digestion. Anaerobic granular sludge, a biofilm, is a specialized microenvironment where syntrophic bacterial and archaeal organisms grow together in close proximity. Exoelectrogenic bacteria degrading organic substrates or intermediates need an electron sink and electrotrophic methanogens represent perfect partners to assimilate those electrons and produce methane. The granule extracellular polymeric substances by making the biofilm matrix more conductive, play a role as electrons carrier in DIET.

Citations

Aug 31, 2020·Microbial Biotechnology·Federico AulentaAmelia-Elena Rotaru
Jul 1, 2018·Environmental Science and Pollution Research International·Xiomar GómezCollin E Snape
Aug 20, 2017·Biointerphases·Wenchao WeiXiao-Ying Yu
Jan 17, 2020·Scientific Reports·Mon Oo Yee, Amelia-Elena Rotaru

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