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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.
North Yorkshire is a ceremonial county in the Yorkshire and the Humber and North East regions of England. It borders County Durham to the north, the North Sea to the east, the East Riding of Yorkshire to the south-east, South Yorkshire to the south, West Yorkshire to the south-west, and Cumbria and Lancashire to the west. Northallerton is the county town.
The county is the largest in England by land area, at 8,654 km2 (3,480 sq mi), and had a population of 1,158,816 in 2021. The largest settlements are Middlesbrough (148,215) in the north-east and the city of York (141,685) in the south. Middlesbrough is part of the Teesside built-up area, which extends into County Durham and has a total population of 376,663 in 2011. The remainder of the county is rural, and the largest towns are Harrogate (75,515) and Scarborough (59,505). For local government purposes the county comprises four unitary authority areas — Middlesbrough, North Yorkshire, Redcar and Cleveland, and York — and part of a fifth, Stockton-on-Tees. The local authorities of York and North Yorkshire are part of a combined authority of the same name, and the local authorities of the other three areas are part of the Tees Valley combined authority. The county was historically part of Yorkshire.
The centre of the county contains a wide plain, called the Vale of Mowbray in the north and Vale of York in the south. The North York Moors uplands lie to the east, and south of them the Vale of Pickering is separated from the main plain by the Howardian Hills. The west of the county contains the Yorkshire Dales, an extensive upland area which contains the source of the River Ouse/Ure and many of its tributaries, which together drain most of the county before reaching the Humber estuary in the south. The Dales also contain the county's highest point, Whernside, at 2,415 feet (736 m).
