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Anaerobic Digestion of farm and food processing residues GoodPractice Guidelines Page26 Feasibility The development of an AD project, either on-farm or as a CAD scheme, is not a simple process, and the starting point depends on the motivation of the developer. For example, it may be a farmer or a food processing company needing a solution to the problem of waste disposal, or to take up an opportunity to supply a CAD scheme, or a local authority energy team wanting to develop a community CAD scheme as a local source of renewable energy. The first stage is therefore likely to be a mixture of decisions about scale, products and markets, feedstock availability and technology (see Figure 2). A technical feasibility study will be needed, although the complexity and cost of this will depend on the scale of the scheme. Even a small on-farm AD project, with all feedstock being supplied by the farm itself and all the products used on the farm, will need some calculations as to the continuous availability of feedstock, the quantities of the products and the opportunity to use them. A large scale scheme is likely to need a detailed formal plan covering all key issues which can be used to raise finance. There are six factors which will typically determine the economic feasibility of any scheme: • Type and quantity of feedstock available, and security of supply. • A sustainable outlet for the liquor: the potential for the land application of the liquor is likely to be the main constraint on the size of the plant, in order to meet local standards (especially in a Nitrate Vulnerable Zone or similarly controlled area). • There are outlets, or uses, for the fibre; all products must be used if the scheme is to be viable. • There are outlets, or uses, for the biogas as heat and/or electricity. • The size and location of the plant, if using the biogas for electricity production, will need to be considered as this will affect planning and grid connection restrictions and costs. • Transport costs and logistics. All schemes should seek expert advice, on costs and potential income, from local energy teams, agricultural business advisers, suppliers of equipment, electricity supply companies who might buy the electricity generated, British Biogen and others with experience of establishing and running AD projects. A case study of Walford College’s AD project is in Appendix 8, including detailed costings.PDF Image | Anaerobic Digestion Of farm and food Processing residues The development of a sustainable industry
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