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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.

Lincoln (/ˈlɪŋkən/) is a cathedral city and county town of Lincolnshire in the East Midlands of England. The non-metropolitan district of Lincoln had a 2012 population of 94,600. The 2011 census gave the urban area of Lincoln, which includes North Hykeham and Waddington, a population of 130,200.

Roman Lindum Colonia developed from an Iron Age settlement on the River Witham. The city's landmarks include Lincoln Cathedral, an example of English Gothic architecture and the tallest building in the world for over 200 years, and the 11th-century Norman Lincoln Castle. The city is home to the University of Lincoln and Bishop Grosseteste University, and to Lincoln City FC and Lincoln United FC.