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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.
Arnold (/ˈɑːr.nəld/) is a market town[3][4] and unparished area[2] in the ceremonial county of Nottinghamshire in the East Midlands of England. It is situated to the north-east of Nottingham's city boundary. Arnold's town centre is the largest in the Borough of Gedling[5] and the most important in the northeastern part of the Greater Nottingham conurbation.[5] Gedling Borough Council is headquartered in Arnold.[6] Since 1968 Arnold has had a market, and the town used to have numerous factories associated with the hosiery industry. Nottinghamshire Police have been headquartered in Arnold[7] since 1979.[8] At the time of the 2011 census, Arnold had a population of 37,768.[1]
Areas within Arnold include Daybrook, Woodthorpe, Redhill, Warren Hill, Killisick and Dorket Head.
