biogas HANDBOOK

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biogas HANDBOOK ( biogas-handbook )

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biogas HANDBOOK Figure 7.12 Screw pipe transporting system (left) and conveyor screws, ready for installation (right) (RUTZ 2007) The insertion of the feedstock into the digester has to be air-tight and should not allow leak of biogas. For this reason, the feed-in system inserts the feedstock below the surface layer of digestate (Figure 7.13). Three systems are commonly used: wash-in shaft, feed pistons and feed conveyor screws. Wash-in shaft Feeding solids to the digester through wash-in shafts or sluices, using front or wheel loaders, allows large quantities of solids to be delivered any time, directly to the digester (Figure 7.13). Figure 7.13 Wash-in shaft, feed pistons and feed conveyors system for feedstock insertion into the digester (FAL 2006) Feed pistons When using feed pistons (Figure 7.13), the feedstock is inserted directly into the digester by hydraulic cylinders, which push the feedstock through an opening in the wall of the digester. This ground level insertion means that the feedstock is soaked in the liquid content of the digester, reducing the risk of floating layer formation. This system is equipped with counter- rotating mixing rollers, which transport co-substrates to the lower horizontal cylinders and, at the same time, crush long fibre materials. 71

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