Surplus electricity may be supplied to anaerobic digesters as H gas to upgrade the CH content of biogas. Acetate accumulation has been observed following H injections, but the parameters determining the degree of acetate accumulation are not well understood. The pathways involved during H consumption and acetate kinetics were evaluated in continuous lab reactors and parallel batch C experiments. Acetate accumulation increased during initial H injections as organic loading rate increased and CO levels decreased below 7%. The share of CH in H and C mass balances increased after repeated H injections, which corresponded with the increase of Methanomicrobiales observed via qPCR. The organic loading rate, the inorganic carbon level and level of methanogen adaption hence determine acetate kinetics during biomethanation of H. The three identified parameters may form the base of a decision tool to assess acetate accumulation during H injections to an anaerobic digester.
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| http://dx.doi.org/10.1016/j.biortech.2018.02.102 | DOI Listing |
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