Metabolic pathway analysis of methane from methanol as substrate in microbial consortium.

ABSTRACT

Simplified anaerobic digestion (SAD) of substrates facilitates microbial methanogenic pathways. In this study, a methane-producing microbial consortium from cow dung was enriched to determine the metabolism and metabolic pathway in the SAD of methanol. The results showed that methanol as a sole substrate produced 167 mL of methane at 10 days significantly higher than 58 mL, 17.6 mL, and 4 mL generated when methanol was combined with sodium formate, sodium formate alone, or sodium acetate. The relative abundance of Methanobacterium, Candidatus_Methanomethylophilus, Methanomassiliicoccus, and Methanosarcina was increased by 5.96 %, 3.77 %, 2.85 %, and 0.14 % in the methanol substrate of AD, respectively. Macrogenome sequencing indicates that methanol wasconverted into Methyl-CoM in the presence of Methanosarcina, which combines with Coenzyme B to produce methane. This study revealed that methanol is converted into methane by a simple pathway.