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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.
Surrey (/ˈsʌri/)[2] is a county in South East England which borders Kent to the east, East Sussex to the southeast, West Sussex to the south, Hampshire to the west, Berkshire to the northwest, and Greater London to the northeast. With about 1.2 million people, Surrey is the 12th-most populous English county, the third-most populous home county, after Kent and Essex, and the third-most populous in the Southeast, after Hampshire and Kent.
Surrey is a relatively affluent county. It has the highest proportion of woodland of counties in England. It has four horse racing courses, and golf courses including the international competition venue at Wentworth.
Guildford is popularly regarded as the county town, although since 2020 Surrey County Council has been based at Woodhatch Place in Reigate, having previously been based at County Hall, Kingston-upon-Thames since 1893.[3] Surrey is divided into eleven districts.
