What Is Anaerobic Digestion?
Anaerobic digestion (AD) is a series of biological processes by which micro organisms break down biodegradable material in the absence of oxygen, the end product is biogas. The 4 stage AD process of hydrolysis, acidifiation, acetogenesis & methanogenesis replicates in the 4 digestive compartments in cows’ stomachs.
History of Anaerobic Digestion
AD has been applied for nearly a century in the water industry as the favoured method for the stabilisation of sewage sludge, with biogas production viewed as a bonus. There are thousands of digesters in rural China, India and Nepal where village-scale plants are important for the recycling of nutrients in farm manure and producing biogas for cooking and lighting.