In this respect, acetogenic bacteria
normally present in the rumen are of interest because they have the potential to provide an alternative sink for H2, an essential intermediate in the formation of CH4.
Kamagata, "Isolation of acetogenic bacteria
that induce biocorrosion by utilizing metallic iron as the sole electron donor," Applied and Environmental Microbiology, vol.
However, propionate, butyrate, valerate, and isobutyrate are introduced for further degradation by syntrophic acetogenic bacteria
to form acetate and hydrogen [42-44].
Acetogenesis, when the acetic acid is produced from the already formed acids under the influence of acetogenic bacteria
The organic acids are further converted into acetate carbon dioxide and hydrogen by acetogenic bacteria
. These products are considered as the direct substrates for methanogens in order to produce methane (Gerardi 2003).The superior activities greater development and better growth rate of homoacetogenic bacteria under psychrophilic conditions are key benefits of this process.
Thirdly, the acetogenic bacteria
convert the products of acidiogens into acetic acid, hydrogen and carbon dioxide.
Acidogenic bugs take over next, converting the soluble compounds into volatile fatty acids and alcohol, which acetogenic bacteria
then turn into acetic acid, C[O.sub.2] and hydrogen.