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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.
Northallerton (/nɔːrˈθælərtən/ nor-THAL-ər-tən) is a market town and civil parish in North Yorkshire, England. It is near the River Wiske in the Vale of Mowbray and had a population of 16,832 in 2011.[1] Northallerton is an administrative centre for York and North Yorkshire Combined Authority and North Yorkshire Council.[2]
There has been a settlement at Northallerton since Roman times. That grew in importance from the 11th century when King William II gifted land there to the Bishop of Durham, and it became an important religious centre. The Battle of the Standard fought nearby in 1138 involved the death of up to 12,000 Scots.[3]
Northallerton was an important stopping point for coaches on the road between Edinburgh and London until the arrival of the railway.[4]
