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Anaerobic Digestion of farm and food processing residues GoodPractice Guidelines Page3 poultry litter) and the food processing industries (including vegetable preparation and dairy food processing). At present, any waste from premises used for agriculture is not controlled waste, including food processing waste. However, food processing waste from other premises is controlled waste and is subject to waste management licensing controls. How does AD work? The digestion process takes place in a warmed, sealed airless container (the digester) which creates the ideal conditions for the bacteria to ferment the organic material in oxygen-free conditions. The digestion tank needs to be warmed and mixed thoroughly to create the ideal Figure 1. Overview of the AD process conditions for the bacteria to convert organic matter into biogas (a mixture of carbon dioxide, methane and small amounts of other gases). There are two types of AD process. • Mesophilic digestion. The digester is heated to 30 - 35oC and the feedstock remains in the digester typically for 15 - 30 days. Mesophilic digestion tends to be more robust and tolerant than the thermophilic process, but gas production is less, larger digestion tanks are required and sanitisation, if required, is a separate process stage. • Thermophilic digestion. The digester is heated to 55oC and the residence time is typically 12 - 14 days. Thermophilic digestion systems offer higher methane production, faster throughput, better pathogen and virus ‘kill’, but require more expensive technology, greater energy input and a higher degree of operation and monitoring.PDF Image | Anaerobic Digestion Of farm and food Processing residues The development of a sustainable industry
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