The digestion of biomass by bacteria in a low oxygen environment, such as at the bottom of a lake, produces biogas, a mixture of carbon dioxide and methane.
Since biogas can be used as a fuel, this process can be harnessed at an industrial scale in an anaerobic digester to convert biogenically derived material, such as food waste, farmyard slurry, or energy crops, into a valuable product. The biogas can be burned to generate electricity, however upgrading the biogas, by removing the carbon dioxide and other impurities, produces an even more valuable resource, biomethane. Biomethane is identical to the methane found in natural gas in all respects bar one; the combustion of biomethane is overall net zero in emissions since the carbon content originated in the biosphere and as such was already part of the carbon cycle.
C-Capture’s technology for biogas upgrading
The suitability of C-Capture’s unique technology for biogas upgrading has been demonstrated at a UK farm, including with more challenging biogas such as that derived from poultry manure which is typified by extremely high levels of hydrogen sulfide.
The potential importance of renewable fuels means that innovative processes to produce biomethane, such as that developed by C-Capture, will be vital in making the transition to a net zero economy.