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biogas HANDBOOK

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biogas HANDBOOK ( biogas-handbook )

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biogas HANDBOOK Figure 4.6 Vertical digester in Germany, processing pig and poultry manure and crop silage (KRIEG AND FISHER 2008) A recent development of the farm scale biogas plant is the concept of energy-crop based plants. Their advantage is that the energy content of energy crops is much higher than of most of the organic waste materials. The major limitations of these kinds of biogas plants are related to operation costs, land use and availability. Figure 4.7 Vertical digester in Germany, built in 2005 for digestion of energy crops (KRIEG and FISHER 2008) 4.1.3 Centralised(joint)co-digestionplants Centralised co-digestion is a concept based on digesting animal manure and slurries, collected from several farms, in a biogas plant centrally located in the manure collection area. The central location of the biogas plant aims to reduce costs, time and manpower for the transport of biomass to and from the biogas plant. Centralised AD plants co-digest animal manure with a variety of other suitable co-substrates (e.g. digestible residues from agriculture, food- and fish industries, separately collected organic household wastes, sewage sludge). The centralised co-digestion plants (also named joint co-digestion plants) were developed and are largely applied in Denmark (Figure 4.8), but also in other regions of the world, with intensive animal farming. 34

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