Biogas is a renewable source of energy that belongs to the category of biofuels. It typically refers to a gas produced by the biological breakdown of organic matter in the absence of oxygen. The anaerobic digestion or fermentation of biodegradable materials such as biomass, manure, sewage, municipal waste, green waste, plant material and crops produces biogas.


Biogas comprises primarily methane (CH4) and carbon dioxide (CO2) and may have small amounts of hydrogen sulphide (H2S), moisture and siloxanes. The gases methane, hydrogen and carbon monoxide (CO) can be combusted or oxidised with oxygen. This energy release allows biogas to be used as a fuel for any heating purpose, such as cooking. It can also be used in anaerobic digesters in a gas engine to convert the energy in the gas into electricity and heat. Biogas can be compressed, much like natural gas, and used to power motor vehicles. It can also be cleaned and upgraded to natural gas standards when it becomes bio methane. The biogas or anaerobic digestion process leaves a nutrient-rich digestate that can be used as fertiliser.

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