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biogas HANDBOOK Figure 7.16 Heating system of a biogas plant (left) and insulation of a concrete digester, under construction (right) (RUTZ 2008) Figure 7.17 Heating pipes, installed inside the digester (AGRINZ 2008) 7.6 Digesters The core of a biogas plant is the digester - an air proof reactor tank, where the decomposition of feedstock takes place, in absence of oxygen, and where biogas is produced. Common characteristics of all digesters, apart from being air proof, are that they have a system of feedstock feed-in as well as systems of biogas and digestate output. In European climates anaerobic digesters have to be insulated and heated. There are a various types of biogas digesters, operating in Europe and around the world. Digesters can be made of concrete, steel, brick or plastic, shaped like silos, troughs, basins or ponds, and they may be placed underground or on the surface. The size of digesters determine the scale of biogas plants and varies from few cubic meters in the case of small household installations to several thousands of cubic meters, like in the case of large commercial plants, often with several digesters. The design of a biogas plant and the type of digestion are determined by the dry matter content of the digested substrate. As mentioned before, AD operates with two basic digestion systems: wet digestion, when the average dry matter content (DM) of the substrate is lower 74PDF Image | biogas HANDBOOK
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