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Anaerobic Digestion of farm and food processing residues GoodPractice Guidelines Page2 Introduction AD is a process which manages farm and food processing residues (Photo: ETSU) What is Anaerobic Digestion? Anaerobic digesters produce conditions that encourage the natural breakdown of organic matter by bacteria in the absence of air. Anaerobic digestion (AD) provides an effective method for turning residues from livestock farming and food processing industries into: • Biogas (rich in methane) which can be used to generate heat and/or electricity • Fibre which can be used as a nutrient-rich soil conditioner, and • Liquor which can be used as liquid fertiliser. The process is already used for treating agricultural, household and industrial residues and sewage sludge. It has been used in the UK agricultural sector in the form of small on-farm digesters producing biogas to heat farmhouses, dairies and other farm buildings. Experience has shown that an AD project is most likely to be financially viable if it is treated as part of an integrated farm waste management system in which the feedstocks and the products from AD all play a part. Larger scale centralised anaerobic digesters (CADs) are also now being developed, using feedstock imported from a number of sources. This document avoids the term ‘waste’ in the context of the residues from livestock farming and food processing industries because ‘waste’ implies that the material is a problem rather than a resource. These guidelines therefore use the term ‘residues’ wherever possible to reinforce the importance of seeing these materials as a renewable resource. These residues offer positive opportunities to contribute to AD as a new and sustainable industry. Feedstock is the term used to describe the material introduced into the digester; in these guidelines it refers specifically to residues from livestock farming (such as dairy, beef and pig slurry, orPDF Image | Anaerobic Digestion Of farm and food Processing residues The development of a sustainable industry
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