Increasing energy costs require to exploit the energy contained in waste water or sewage sludge. Up to now sludge digestion has been primarily applied in bigger sewage plants. In the meantime sewage sludge which has been considered as problematic recently, has an excellent chance to become a useful energy resource also in smaller sewage plants.
Sludge digestion in general is considered as too expensive due to the complex construction of conventional digesters. Various surveys and operating experiences have shown that digestion of sludge can be achieved with less constructional, technical and financial costs without disregarding the operational safety.
The German group of consulting engineers has worked on the optimisation of the digestion process by developing a new planning concept for a compact digester, whereas the usual elementary construction of the rectangular digesters result in a compact building which is optimised by an annexe including the peripheral equipment.
Due to the piping, the system can be operated either in two stages or in two directions.
In case of maintenance or repairing, one of the hoppers can temporarily be put out of operation so that the remaining one can be used separately for a short time.
The biological rearrangement will be carried out by simple and centrally arranged stirring devices with external driving motors. Due to the low height of the construction the costs can be minimised.
They want to offer their planning service to interested partners, and are looking for a services agreement.