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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.
Leicester (About this soundlisten) LEH-ster) is a city and unitary authority area in the East Midlands of England, and the county town of Leicestershire. The city lies on the River Soar and close to the eastern end of the National Forest. It is to the north-east of Birmingham and Coventry, south of Nottingham, and west of Peterborough.
The 2016 mid year estimate of the population of the City of Leicester unitary authority was 348,300, an increase of approximately 18,500 (Increase 5.6%) from the 2011 census figure of 329,839, making it the most populous municipality in the East Midlands region. The associated urban area is also the 11th most populous in England and the 13th most populous in the United Kingdom.
Leicester is at the intersection of two major railway lines—the north–south Midland Main Line and the east/west Birmingham to London Stansted CrossCountry line; as well as the confluence of the M1/M69 motorways and the A6/A46 trunk routes. Leicester is the home to football club Leicester City and rugby club Leicester Tigers.
