The roles of acetotrophic and hydrogenotrophic methanogens during anaerobic conversion of biomass to methane: a review

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Methane fermentation process as anaerobic digestion of biomass: Transformations, stages and microorganisms (2012, methodology): “The reaction of butyrate oxidation, carried out by these microorganisms, may occur only when low pressure of H2 is maintained (Demirel and Scherer, 2008; McMahon et al., 2004).”
Biogas production through syntrophic acetate oxidation and deliberate operating strategies for improved digester performance (2016, positive): “The doubling time of acetoclastic methanogens, experimentally determined to be about 8–36 h and 1– 9 days for Methanosarcina and Methanosaeta, respectively [125], can be compared with the 28 days obtained in cultivation of defined syntrophic acetate oxidising co-culture at 37 C (initial acetate conc”
Direct Interspecies Electron Transfer between Geobacter metallireducens and Methanosarcina barkeri (2014, background): “The abundance of H2/formate-consuming methanogens in anaerobic soils (7, 8) and sediments (9, 10) as well as some anaerobic digesters (11) suggests that HIT plays an important role in methane production in those environments.”
Biogas upgrading and utilization: Current status and perspectives. (2018, background): “In contrast, exogenous addition of H 2 is responsible for inhibiting syntrophic acetogens (involved in propionate and butyrate degradation) and syn-trophic acetate oxidizers (SAO) (Demirel and Scherer, 2008).”