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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.
Somerset (/ˈsʌmərsɪt, -sɛt/ ⓘ SUM-ər-sit, -set;[2] archaically Somersetshire /ˈsʌmərsɪt.ʃɪər, -sɛt-, -ʃər/ SUM-ər-sit-sheer, -set-, -shər) is a ceremonial county in South West England. It is bordered by the Bristol Channel, Gloucestershire, and Bristol to the north, Wiltshire to the east and the north-east, Dorset to the south-east, and Devon to the south-west. The largest settlement is the city of Bath, and the county town is Taunton.
Somerset is a predominantly rural county, especially to the south and west, with an area of 4,171 km2 (1,610 sq mi) and a population of 965,424. After Bath (101,557), the largest settlements are Weston-super-Mare (82,418), Taunton (60,479), and Yeovil (49,698). Wells (12,000) is a city, the second-smallest by population in England. For local government purposes the county comprises three unitary authority areas: Bath and North East Somerset, North Somerset, and Somerset. Bath and North East Somerset Council is a member of the West of England Combined Authority.
The centre of Somerset is dominated by the Levels, a coastal plain and wetland. The north-east contains part of the Cotswolds uplands and all of the Mendip Hills, which are both national landscapes; the west contains the Quantock Hills and part of the Blackdown Hills, which are also national landscapes, and most of Exmoor, a national park. The major rivers of the county are the Avon, which flows through Bath and then Bristol, and the Axe, Brue, and Parrett, which drain the Levels.
There is evidence of Paleolithic human occupation in Somerset, and the area was subsequently settled by the Celts, Romans and Anglo-Saxons. The county played a significant part in Alfred the Great's rise to power, and later the English Civil War and the Monmouth Rebellion. In the later medieval period its wealth allowed its monasteries and parish churches to be rebuilt in grand style; Glastonbury Abbey was particularly important, and claimed to house the tomb of King Arthur and Guinevere. The city of Bath is famous for its Georgian architecture, and is a UNESCO World Heritage Site. The county is also the location of Glastonbury Festival, one of the UK's major music festivals.
