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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.
Northampton /nɔːrˈθæmptən/ (About this soundlisten) is a large market town and the county town of Northamptonshire in the East Midlands of England. It lies on the River Nene, 60 miles (97 km) north-west of London and 50 miles (80 km) south-east of Birmingham.[2][3] One of the largest towns (as opposed to cities) in England,[4] it had a population of 212,100 at the 2011 census (223,000 est. 2019).
Archaeological evidence of settlement in the area dates to the Bronze Age, Romans and Anglo-Saxons. In the Middle Ages, the town rose to national significance with the establishment of Northampton Castle, an occasional royal residence which regularly hosted the Parliament of England. Medieval Northampton had many churches, monasteries and the University of Northampton, all enclosed by the town walls. It was granted a town charter by Richard I in 1189 and a mayor was appointed by King John in 1215. The town was also the site of two medieval battles, in 1264 and 1460.
Northampton supported the Parliamentary Roundheads in the English Civil War, and Charles II ordered the destruction of the town walls and most of the castle. The Great Fire of Northampton in 1675 destroyed much of the town. It was soon rebuilt and grew rapidly with the industrial development of the 18th century. Northampton continued to grow with the arrival of the Grand Union Canal and the railways in the 19th century, becoming a centre for footwear and leather manufacture.
Northampton's growth was limited until it was designated as a New Town in 1968, accelerating development in the town. It unsuccessfully applied for city status in 2000.[5]
