Biogasification of coal is important for clean
utilization of coal. Experiments on the fermentation of single lignite, single
straw and their mixture were performed to explore the variation characteristics
of gas production potential, microbial community and methanogenic metabolic
pathways of mixture. Research has shown that mixed fermentation of lignite and
straw significantly promoted biomethane production. The abundance of hydrolytic
acidifying functional bacteria genera (Sphaerochaeta, Lentimicrobium) in mixed fermentation was higher than that in the fermentation
of single lignite and single straw. The abundance of some key CAZy
metabolic enzyme gene sequences in mixed
fermentation group was increased, which was favorable to improve methane
production. Aceticlastic methanogenesis was the most critical methanogenic
pathway and acetic acid pathway was more competitive in methanogenic mode
during peak fermentation. Macrogenomics provided theoretical support for the
claim that mixed fermentation of coal and straw promoted biomethane metabolism,
which was potentially valuable in expanding methanogenesis from mixed
fermentation of lignite with different biomasses.
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