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Figure 6.4 Distribution of dry matter and nutrients in separated fractions from decanter centrifuge (AL SEADI and MOELLER 2003) The fibre separation is done by separators or spiral sieves, decanters and occasionally by ribbon-sieve presses (Figure 6.5). 15-20% of the solids are separated by spiral sieves and more than 60% by decanter centrifuges. Most of nitrogen (up to 90%) is separated with the liquid fraction, while phosphorus is only partially removed, as bonded to the fibre fraction/particles of solid matter. The total conditioning processes (including water extraction) uses two main technologies: membrane separation technology or evaporation technique. Both are technologically complex and require significant energy consumption. For this reason, they are economically feasible for biogas plants with capacities higher than 700 kW. Figure 6.5 Fibers collection wagon, with distribution screw (ANGELIDAKI 2004) biogas HANDBOOK 57PDF Image | biogas HANDBOOK
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