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Last edited 20 May 2021
Biogas is mainly composed of methane and carbon dioxide, but may also contain small amounts of nitrogen, hydrogen and carbon monoxide, as well water vapour and contaminants such as hydrogen sulphide and siloxanes.
After a relatively striaght-forward clean-up process, biogas (sometimes called biomethane or renewable natural gas (RNG)) can be used as a fuel. Biogas has been used as a fuel for many centuries, and in the UK, the city of Exeter used biogas for street lighting as early as 1895.
Typically, anaerobic digestion requires a heat source, and so biogas is often used to fuel combined heat and power (CHP) plant that produces both electricity and heat. The heat can be used for the anaerobic digestion process and can also be used to pasteurise animal-derived waste so that it can be used as fertilisers.
Combined heat and power plant can feed electricity into the national grid, and so biogas installations may qualify for payments under the renewable heat incentive (RHI) scheme (other than biogas from landfill).
Net Zero by 2050, A Roadmap for the Global Energy Sector, published by the International Energy Agency in May 2021, defines biogas as: ‘A mixture of methane, carbon dioxide and small quantities of other gases produced by anaerobic digestion of organic matter in an oxygen-free environment.’
Is suggests that biogases: ‘Include biogas and biomethane.’
 Related articles on Designing Buildings Wiki
- Anaerobic digestion (repeats some of the text in this article).
- Conventional liquid biofuel.
- Environmental impact of biomaterials and biomass (FB 67).
- Feed in tariff.
- Gas Goes Green.
- Liquefied petroleum gas (LPG).
- Mains gas.
- Natural gas.
- Oil - a global perspective.
- Peak oil.
- Renewable energy.
- Renewable heat incentive.
- Shale gas.
- Types of fuel.
- Water vapour.
- Zero carbon homes.
- Zero carbon non-domestic buildings.
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