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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.
Worcester (/ˈwʊstər/ (About this soundlisten) WUUS-tər) is a cathedral city in Worcestershire, England, 30 miles (48 km) south-west of Birmingham, 101 miles (163 km) west-north-west of London, 27 miles (43 km) north of Gloucester and 23 miles (37 km) north-east of Hereford. The population is about 100,000. The River Severn flanks the western side of the city centre, which is overlooked by Worcester Cathedral. The Battle of Worcester in 1651 was the final one in the English Civil War, where Oliver Cromwell's New Model Army defeated King Charles I's Royalists. Worcester is the home of Royal Worcester Porcelain, composer Edward Elgar,[1] Lea & Perrins, makers of traditional Worcestershire sauce, University of Worcester, and Berrow's Worcester Journal, claimed as the world's oldest newspaper.
