The author reviews the current state of recent microbial community studies conducted on lab-pilot-full scale agricultural biogas digesters fed with energy crops operated in mono- and codigestion modes with or without use of manure as cosubstrate. It is commonly concluded by researchers that methane (CH4) formation mostly resulted from conversion of hydrogen (H2) and carbon dioxide (CO2), rather than aceticlastic methanogenesis. Hydrogenotrophic methanogenesis seems to be the major pathway for formation of methane from energy crops in agricultural biogas digesters.
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Burak Demirel (2013) studied this question.
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