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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.
The Metropolitan Borough of Bolton /ˈboʊltən/ (About this soundlisten) is a metropolitan borough of Greater Manchester, England, named after its largest town, Bolton, but covering a far larger area which includes Blackrod, Farnworth, Horwich, Kearsley, Westhoughton, and part of the West Pennine Moors. It has a population of 276,800.
The boundaries were set by the Local Government Act 1972, and cover eight former local government districts; seven Urban Districts from the administrative county of Lancashire, and the County Borough of Bolton. The metropolitan districts of Bury, Salford and Wigan lie to the east, south and west respectively; and the unitary authority of Blackburn with Darwen and the non-metropolitan district of Chorley in Lancashire to the north and north-west.
