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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.
Oxfordshire[a] is a landlocked county in the far west of the government statistical region of South East England. The ceremonial county borders Warwickshire to the north-west, Northamptonshire to the north-east, Buckinghamshire to the east, Berkshire to the south, Wiltshire to the south-west and Gloucestershire to the west.
The county has major education and tourist industries, and is noted for concentrations of performance motorsport, car manufacturing and technology companies. The University of Oxford is widely considered one of the leading universities in the world, and is linked to a concentration of local technology and science activities at locations such as the Harwell Science and Innovation Campus, while Oxford University Press is the largest firm among a concentration of print and publishing firms.
As well as the city of Oxford, other centres of population are Banbury, Bicester, Kidlington and Chipping Norton to the north of Oxford; Carterton and Witney to the west; Thame and Chinnor to the east; and Abingdon-on-Thames, Wantage, Didcot, Wallingford and Henley-on-Thames to the south. All its zones south of the Thames: the Vale of White Horse and parts of South Oxfordshire were within the historic county of Berkshire, including the highest point, the 261-metre (856 ft) White Horse Hill.[5]
Oxfordshire's county flower is the snake's-head fritillary.[6]
