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biogas HANDBOOK Agricultural biogas plants operate with four different process stages (Figure 7.3): 1. Transport, delivery, storage and pre-treatment of feedstock 2. Biogas production (AD) 3. Storage of digestate, eventual conditioning and utilisation 4. Storage of biogas, conditioning and utilisation The process stages shown in Figure 7.3 are further illustrated in Figure 7.4, showing a simplified representation of a typical agricultural co-digestion plant. 1. The first process stage (storage, conditioning, transport and insertion of feedstock) includes the storage tank for manure (2), the collection bins (3), the sanitation tank (4), the drive-in storage tanks (5) and the solid feedstock feeding system (6). 2. The second process stage includes the biogas production in the biogas reactor (7), also referred to as the digester. 3. The third process stage is represented by the storage tank for digestate (10) and the utilisation of digestate as fertiliser on the fields (11). 4. The fourth process stage (biogas storage, conditioning and utilisation) consists of the gas storage tank (8) and the CHP- unit (9). These four process stages are closely linked to each other (e.g. stage 4 provides the necessary process heating for stage 2). 1 Stalls 2 Liquid manure tanks 3 Collection bins for biowaste (co-substrate) 4 Sanitation tank 5 Drive-in storage tanks 6 Solid feedstock feed-in system 7 Digester (Biogas reactor) 8 Biogas storage tank 9 CHP plant 10 Digestate storage 11 Agricultural fields 12 Transformer/ Power to greed 13 Heat utilisation Figure 7.4 Agricultural co-digestion biogas plant using manure and maize silage (LORENZ 2008) 62PDF Image | biogas HANDBOOK
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