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Biogas
Biogas is a gaseous renewable energy source[1] produced from raw materials such as agricultural waste, manure, municipal waste, plant material, sewage, green waste, wastewater, and food waste. Biogas is produced by anaerobic digestion with anaerobic organisms or methanogens inside an anaerobic digester, biodigester or a bioreactor.[2] The gas composition is primarily methane (CH
4) and carbon dioxide (CO
2) and may have small amounts of hydrogen sulfide (H
2S), moisture and siloxanes. The methane can be combusted or oxidized with oxygen. This energy release allows biogas to be used as a fuel; it can be used in fuel cells and for heating purpose, such as in cooking. It can also be used in a gas engine to convert the energy in the gas into electricity and heat.[3]
After removal of carbon dioxide and hydrogen sulfide it can be compressed in the same way as natural gas and used to power motor vehicles. In the United Kingdom, for example, biogas is estimated to have the potential to replace around 17% of vehicle fuel.[4] It qualifies for renewable energy subsidies in some parts of the world. Biogas can be cleaned and upgraded to natural gas standards, when it becomes bio-methane. Biogas is considered to be a renewable resource because its production-and-use cycle is continuous, and it generates no net carbon dioxide. From a carbon perspective, as much carbon dioxide is absorbed from the atmosphere in the growth of the primary bio-resource as is released, when the material is ultimately converted to energy.
Brentwood is a town in the Borough of Brentwood, in the county of Essex in the East of England.[1] It is in the London commuter belt, situated 20 miles (30 km) east-north-east of Charing Cross and close by the M25 motorway. In 2017, the population of the town was estimated to be 54,885.[2]
Brentwood is a suburban town with a small shopping area and high street. Beyond this are residential developments surrounded by open countryside and woodland; some of this countryside lies within only a few hundred yards of the town centre.
Since 1978, Brentwood has been twinned with Roth in Germany and with Montbazon in France since 1994.[3] It also has a relationship with Brentwood, Tennessee in the United States.
