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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.
Potters Bar is a town in Hertfordshire, England,[1] 13 miles (21 km) north of central London. In 2011, it had a population of 21,882.[2][n 1] In the 2021 census, the four wards that make up Potters Bar - Bentley Heath & The Royds, Furzefield, Oakmere and Parkfield - had a combined population of 22,536. This includes several smaller outlying hamlets contained in the Bentley Heath & The Royds ward, such as Bentley Heath and Ganwick Corner. In 2022 the population was around 23,325.[3]
Within the historic county of Middlesex until 1965, the town dates to the early 13th century but remained a small, mainly agricultural, settlement until the arrival of the Great Northern Railway in 1850.[4] It is now part of the London commuter belt.[5]
