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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.
Warwick (/ˈwɒrɪk/ WOR-ik) is a market town and county town of Warwickshire, England. It lies near the River Avon, 11 miles (18 km) south of Coventry and west of Leamington Spa and Whitnash. Its population was 31,345 in 2011. Signs of Neolithic activity precede unbroken habitation to the 6th century AD. It was a Saxon burh in the 9th century; Warwick Castle was built during the Norman conquest of England. Warwick School claims to be the country's oldest boys' school. The earldom of Warwick, created in 1088, controlled the town and built its walls, of which Eastgate and Westgate survive. The castle became a fortress, then a mansion. The Great Fire of Warwick in 1694 destroyed much of the town. Warwick missed industrialisation, but the population has grown almost sixfold since 1801.
