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Input materials like bio-waste, food waste, expired nutrients etc. are delivered in a waste reception hall. The substrates are then fed to the hopper of a sizing plant by means of walking floor, screws or front loader.
The materials are then crushed in the sizing plant with the help of shredders, rotor shears or hammer mills and then routed to the big pulper. The slurrying of the substrates is processed in the pulper using process water. In the pulper the substrates are intensively mixed and packaging like plastic, glass or metal are separated. The heavy material is extracted batch wise from the pulper as heavy material while the substrate mixture is further routed to a swim- and sink tank with an agitator. The light fraction like plastic and paper swims up and are extracted as light fraction. Heavy materials like glass, metals, sand and stones sink and are extracted from the bottom.
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The light material has to be incinerated at a garbage incinerator whereas the heavy material is deposited on landfill after magnetic separation. After the swim- and sink-tank, the substrate mixture is transported to a hygienisation unit where it goes through hygienisation for 1 h at 70°C or for 20 minutes for 133°C. This process destroys the pathogens’ germs. After hygienisation the substrate mixture is transported to the main fermenter. Very critical substrates like slaughterhouse residues (category 1) can be sterilized with the help of thermo-pressure-hydrolyses.
Liquid substrates are also subjected to hygienisation or if necessary routed directly to the main fermenter.
The fermentation residues are separated in a centrifuge into a solid and a liquid fraction. The solid fraction can be composted by using an aerated intensive rotting pile followed by a non-aerated after rotting pile. After a residence time of approximately 60 days the finished compost can be screened off and can be sold. Alternatively, the solid fermentation residue can be dried with hot air and afterwards briquetted. The briquettes can be used to produce energy.
The liquid fermentation residues can be brought out to the fields after ammonia stripping. They can also be transported to a waste water cleaning plant. |
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