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Anaerobic Digestion of farm and food processing residues GoodPractice Guidelines Page31 • Equipment fail safe devices throughout • Environmental controls. Although the main process stage is the anaerobic digestion tank, there are a range of preliminary and post-digester units necessary for an integrated plant. For a farm-scale digester, feedstock conditioning may be limited to minimising the water content of the material and preventing large lumps reaching the digestion tank, whereas a CAD plant will require special feedstock handling and storage units. Overall, there will be a range of structures, depending on scale including: • Appropriate waste reception and loading facilities • Digester; the size depends on projected volume and nature of waste to be dealt with, and on the temperature and retention time in the digester • Mixing devices • Gas holder • Gas handling equipment including pipework, valves, flare stack/heat dump • Electricity generating equipment, powered by ignition engines converted to run on methane, gas turbines and electricity generators • Boilers to provide heat for the digester • Pipework to remove the water which condenses out from the saturated gas which is produced by AD • Appropriate storage for liquor and fibre • Control and monitoring equipment • Odour control equipment. CAD operations are also likely to require equipment for volume recording and analysis facilities for quality assurance and contractual requirements, as well as monitoring equipment for safety and operational purposes. The crucial factor is to identify the appropriate plant design to meet the user’s requirements for the whole project. The plant, to be successful, should have both a quality guarantee from the feedstock suppliers and a performance guarantee from the plant installers and designer. The performance guarantee should include factors such as: • Heating performance, eg keep digester contents at 350C with an ambient temperature of -100C provided adequate feedstock is being added • Digester contents mixing, which can be defined as the total contents being mixed within 30 minutes • Temperature differential does not exceed 20C across the digester vessel • The digester loading system will handle the feedstock • The unloading system will handle the digestate at the designed rate, including separation (when appropriate) • The generator should, when supplied with the electrical and heat loads, for a minimum of the stated number of hours per year • The developer should choose the best available technology to minimise environmental impact; the performance guarantee should cover operation to required environmental standards. correct amount of biogas, produce the specifiedPDF Image | Anaerobic Digestion Of farm and food Processing residues The development of a sustainable industry
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