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Biogas is a mixture of gases produced by AD. Its major constituents are methane (CH4) at about 60% and carbon dioxide (CO2) at around 40% with other gases in trace amounts (mostly hydrogen sulphide and ammonia). The composition of the biogas depends on the type of feedstock and the type of AD. Biogas can be 'upgraded' to pure methane, often called biomethane, by removing the other gases.
Biogas can be used for renewable heat and power. The energy in biogas can be used in several ways:
- Heat production
- Electricity production
- Combined heat and power
- Transport fuel
- Injection in to the main gas grid
An overview of the energy balance of AD can be found on the Renewable Energy Association website.
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