For the maintenance of living microorganisms (methanogens)
in a complex ecological system (anaerobic digestion process),
the microorganisms use the chemical energy released by
their own catabolism. In this paper, the thermodynamic equilibrium
model shows that the overall catabolic reactions of
methanogens can, under batch isothermal, and isobaric conditions
(25 ◦C+ 1 atm), decompose acetic acid (HAc) completely
into end-products (methane and carbon dioxide). The endproducts
then expand into the vapour phase due to their high
volatility.