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The molecular machinery of the complex microbiological cell factory of biomethane production is not fully understood. One of the process control elements is the regulatory role of hydrogen (H₂). Reduction of carbon dioxide (CO₂) by H₂ is rate limiting factor in methanogenesis, but the community intends to keep H₂ concentration low in order to maintain the redox balance of the overall system. H₂ metabolism in methanogens becomes increasingly important in the Power-to-Gas renewable energy conversion and storage technologies.

The early response of the mixed mesophilic microbial community to H₂ gas injection was investigated with the goal of uncovering the first responses of the microbial community in the CH₄ formation and CO₂ mitigation Power-to-Gas process. The overall microbial composition changes, following a 10 min excessive bubbling of H₂ through the reactor, was investigated …