Banner Default Image

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]

Worksop (/ˈwɜːrksɒp/ WURK-sop) is the largest town in the Bassetlaw district of the ceremonial county of Nottinghamshire in the East Midlands of England. Worksop lies on the River Ryton, and is located at the northern edge of Sherwood Forest. Worksop is located 19 miles (31 km) east-south-east of Sheffield, with a population of 41,820.[2] It lies close to Nottinghamshire’s borders with South Yorkshire, and Derbyshire.

Worksop, a market town, has become a commuter town as a result of its geographic location and ease of access to major motorways and rail links.

Worksop is known as the "Gateway to The Dukeries", because of the now four obsolete ducal principal sites of which were closely located next to each other, south of the town. These four ducal locations were; Clumber House, Thoresby Hall, Welbeck Abbey and Worksop Manor. Other houses such as Rufford Abbey and Hodsock Priory are also just a few miles away.

Worksop is twinned with the German town Garbsen.

Latest jobs