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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.
Salisbury (locally /ˈsɔːzb(ə)ri/ SAWZ-b(ə-)ree)[a] is a cathedral city in Wiltshire, England with a population of 41,820,[1] at the confluence of the rivers Avon, Nadder and Bourne. The city is approximately 20 miles (30 kilometres) from Southampton and 30 miles (50 kilometres) from Bath.
Salisbury is in the southeast of Wiltshire, near the edge of Salisbury Plain. An ancient cathedral was north of the present city at Old Sarum. A new cathedral was built near the meeting of the rivers and a settlement grew up around it, which received a city charter in 1227 as New Sarum. This continued to be its official name until 2009, when Salisbury City Council was established. Salisbury railway station is an interchange between the West of England Main Line and the Wessex Main Line.
Stonehenge, a UNESCO World Heritage Site, is 8 miles (13 kilometres) northwest of Salisbury.
