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[2] [6] [7] Naturally occurring methane is mainly produced by the process of methanogenesis, a form of anaerobic respiration used by microorganisms as an energy source. [8] Methanogenesis usually only occurs under anoxic conditions. By contrast, aerobic methane production is thought to occur in oxygenated environments under near-ambient conditions.
Biological methanation takes place in a separate methanation plant. The gas is completely converted into methane before the infeed into the gas grid. The carbon dioxide, produced in a gas processing system, is converted into methane in a separate methanation plant, by adding hydrogen and can then be fed into the gas grid.
The production of methane is an important and widespread form of microbial metabolism. In anoxic environments, it is the final step in the decomposition of biomass . Methanogenesis is responsible for significant amounts of natural gas accumulations, the remainder being thermogenic.
These protons are then used in the major pathway that drives methane production in electromethanogenesis—CO 2 reduction. CO 2 is brought in on the biocathode side of the system where it is reduced by the protons produced by the microorganisms to yield H 2 O and methane (CH 4 +). Methane is produced and can then be released from the biocathode ...
Methanation reaction over different carried metal catalysts including Ni, [4] Ru [5] and Rh [6] has been widely investigated for the production of CH 4 from syngas and other power to gas initiatives. [3] Nickel is the most widely used catalyst due to its high selectivity and low cost. [1]
Methane production, or methanogenesis, is the only biochemical pathway for ATP generation in methanogens. All known methanogens belong exclusively to the domain Archaea , although some bacteria, plants, and animal cells are also known to produce methane. [ 1 ]
In this way, the production of renewable gas can be phased in at the same rate as the production capacity is increased. The gas market and infrastructure the natural gas has contributed with is a condition for large scale introduction of renewable biomethane produced through anaerobic digestion ( biogas ) or gasification and methanation bio-SNG.
A biomass to RNG efficiency of 70% can be achieved during the production process. [9] [10] Costs are minimized by maximizing production scale and by locating an anaerobic digestion plant next to transport links (e.g. a port or river) for the chosen source of biomass. The existing gas storage infrastructure would allow the plant to continue to ...