SCFA including acetate are key intermediates in an anaerobic
digestion of organic matters to methane [2–6]. In particular to
acetate,fermentative,acetogenic and homo-acetogenic bacteria are
the main contributors to its production.Fermentative and acetogenic
bacteria are involved in theproduction of H2, CO2, acetate and other
products [3]. On the other hand,homo-acetogenic bacteria utilize H2
and CO2 for the production of acetate via homo-acetogenesis pathway according to Eq.(1). The feasibility of the
homo-acetogenesis pathway is highly sensitive to the amount of hydrogen.Inthe