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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.
Wakefield is a cathedral city[a] in West Yorkshire, England located on the River Calder. The city had a population of 109,766 in the 2021 census, up from 99,251 in the 2011 census.[1] The city is the administrative centre of the wider Metropolitan Borough of Wakefield, which had a 2022 population of 357,729, the 26th most populous district in England. It is part of the West Yorkshire Built-up Area and the Yorkshire and The Humber region.
In 1888, it gained city status due to its cathedral. The city has a town hall and is home to the county hall, which was the former administrative centre of the city's county borough and metropolitan borough as well as county town for the West Riding of Yorkshire.
The Battle of Wakefield took place in the Wars of the Roses, and the city was a Royalist stronghold in the Civil War. Wakefield became an important market town and centre for wool, exploiting its position on the navigable River Calder to become an inland port. In the 18th century, Wakefield traded in corn, coal and textiles.
