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Anaerobic Digestion
Anaerobic digestion is a sequence of processes by which microorganisms break down biodegradable material in the absence of oxygen.[1] The process is used for industrial or domestic purposes to manage waste or to produce fuels. Much of the fermentation used industrially to produce food and drink products, as well as home fermentation, uses anaerobic digestion.
Anaerobic digestion occurs naturally in some soils and in lake and oceanic basin sediments, where it is usually referred to as "anaerobic activity".[2][3] This is the source of marsh gas methane as discovered by Alessandro Volta in 1776.[4][5]
The digestion process begins with bacterial hydrolysis of the input materials. Insoluble organic polymers, such as carbohydrates, are broken down to soluble derivatives that become available for other bacteria. Acidogenic bacteria then convert the sugars and amino acids into carbon dioxide, hydrogen, ammonia, and organic acids. In acetogenesis, bacteria convert these resulting organic acids into acetic acid, along with additional ammonia, hydrogen, and carbon dioxide amongst other compounds. Finally, methanogens convert these products to methane and carbon dioxide.[6] The methanogenic archaea populations play an indispensable role in anaerobic wastewater treatments.[7]
Anaerobic digestion is used as part of the process to treat biodegradable waste and sewage sludge. As part of an integrated waste management system, anaerobic digestion reduces the emission of landfill gas into the atmosphere. Anaerobic digesters can also be fed with purpose-grown energy crops, such as maize.[8]
Anaerobic digestion is widely used as a source of renewable energy. The process produces a biogas, consisting of methane, carbon dioxide, and traces of other 'contaminant' gases.[1] This biogas can be used directly as fuel, in combined heat and power gas engines[9] or upgraded to natural gas-quality biomethane. The nutrient-rich digestate also produced can be used as fertilizer.
With the re-use of waste as a resource and new technological approaches that have lowered capital costs, anaerobic digestion has in recent years received increased attention among governments in a number of countries, among these the United Kingdom (2011),[10] Germany,[citation needed] Denmark (2011),[11] and the United States.[12]
Hucknall (/ˈhʌknɔːl/), formerly Hucknall Torkard (/ˈtɔːrkərd/), is a market town in the Ashfield district of Nottinghamshire, England. It lies 7 miles (11 km) north of Nottingham, 7 miles (11 km) southeast of Kirkby-in-Ashfield, 9 miles (14 km) from Mansfield and 10 miles (16 km)south of Sutton-in-Ashfield. It is the second-largest town in the Ashfield district after Sutton-in-Ashfield.
Hucknall is on the west bank of the Leen Valley, on land which rises from the Trent Valley in the south and extends northwards to Kirkby-in-Ashfield. The Whyburn or Town Brook flows through the town centre. Farleys Brook marks its southern boundary. Due to the mass amount of housing and industrial estates along the southside of the town. Hucknall is contiguous with the wider City of Nottingham with the suburbs of Bulwell and Bestwood Village both to the south and southeast.
Hucknall town centre
The town's highest point is Long Hill, at 460 ft (140 m) above sea level, with views over the city and Trent Valley, which descends to 22–24 metres (72–79 ft) AOD, flowing just beyond most of the city centre.[2]
The town is surrounded by farmland or parkland. To the north-west lie Misk Hills and Annesley. To the north-east of the town are the villages of Linby and Papplewick, and beyond these two, Newstead Abbey and its grounds, once the residence of Lord Byron. To the west lies Eastwood, birthplace of D. H. Lawrence and an inspiration for many of his novels and short stories. To the east of the town is Bestwood Country Park.
The contiguous settlements of Butler's Hill and Westville often appear as distinct entities on maps, but are generally seen as parts of Hucknall. They belong to its historic and present-day Church of England parish, although the town itself has no civil parish council. The identity is reinforced by being part of the post town and by being shared wards of Hucknall.
