Biogas is the gas that is the product of the digestion of organic materials under anaerobic conditions. Substrates such as manure, sewage sludge, municipal solid waste, biodegradable wastes or feedstock are transformed into methane and carbon dioxide.
Typical composition of biogas
*often 5 % of air is introduced for microbiological desulphurisation
The process of anaerobic digestion is done by methane bacteria. Necessary milieu conditions are: