SCFAincludingacetatearekeyintermediatesinananaerobic
digestionoforganicmatterstomethane [2–6]. Inparticularto
acetate,fermentative,acetogenicandhomo-acetogenicbacteriaare
themaincontributorstoitsproduction.Fermentativeandacetogenic
bacteriaareinvolvedintheproductionofH2, CO2, acetateandother
products [3]. Ontheotherhand,homo-acetogenicbacteriautilizeH2
andCO2 for theproductionofacetateviahomo-acetogenesispath-
wayaccordingto Eq.(1). Thefeasibilityofthehomo-acetogenesis
pathwayishighlysensitivetotheamountofhydrogen.Inthe