The screenings cause considerable problems during disposal. In its untreated state, it is very moist and still contains a considerable proportion of easily degradable organic matter, which can lead to unpleasant odours due to spontaneous decomposition processes.
In a sewage treatment plant, pieces of wood, plastic foils and other heavy materials are fed in via the waste water inlet. These are collected with the screenings in front of the screens and are then removed from the waste water stream during the screen clearing process.
In order to dehydrate the screenings as much as possible before their disposal, it is necessary to shred the material. This increases the surface area of the material and improves subsequent drying. For this shredding process, twin-shaft shredders are generally used.
The disposal of screenings is usually also a cost issue. Wet screenings are heavy and therefore associated with increased costs.
With our special machine technology of the bulkhead wall seal, a trouble-free shredding of wet and contaminated screenings is guaranteed. Your shredded material can be fed directly to a coupled screenings screw press. Thus, the material is compressed and dehydrated and you can reduce your disposal costs many times over. In order to achieve an even higher dry matter content, however, it is necessary to wash the screenings prior to the screw press. This washes out and removes faeces, fats and sludge.