Discussion
Which methanogen does not utilize hydrogen to reduce the organic compound or CO2 to methane during anaerobic digestion process ?
Answer: C
The methanogens that do not use hydrogen are the acetotrophic methanogens.
Acetotrophic (acetoclastic) methanogens such as Methanosaeta split acetate directly into methane and carbon dioxide, with no hydrogen needed. This route produces about two-thirds of the methane in a typical digester.
Hydrogenotrophic methanogens reduce CO2 with hydrogen, and methylotrophic methanogens convert methylated compounds such as methanol and methylamines, some of them using hydrogen to do so. 'Methanotrophic methanogens' is a contradiction: methanotrophs are bacteria that consume methane rather than produce it.
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