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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.
St Albans (/sənt ˈɔːlbənz/) is a cathedral city in Hertfordshire,[1] England and the main urban area in the City and District of St Albans. It lies east of Hemel Hempstead and west of Hatfield, about 20 miles (32 km) north-north-west of central London, 8 miles (13 km) south-west of Welwyn Garden City and 11 miles (18 km) south-south-east of Luton. St Albans was the first major town on the old Roman road of Watling Street for travellers heading north and it became the Roman city of Verulamium. It is within the London commuter belt and the Greater London Built-up Area. With a population of 82,146, it is the fourth-most-populous settlement in Hertfordshire.
