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The rotating biological contactors (RBC) are the heart of the System S&P® system. By continuously rotating on their own axis, they ensure an excellent biological purification of the wastewater.
The biofilm which forms on the biodiscs efficiently purifies the wastewater. The plane-parallel disks are slowy rotated, exposing them alternately to the substrate and the ambient air. In an aerobic process, the dissolved organic pollution load is converted into excess sludge (C-reduction). It is then nitrified without oxygen limitation, whereby ammonia is converted into nitrate, which is no longer poisonous to fish. In the RBC method, the biomass adheres to polypropelene discs, which rotate so that it is periodically exposed to atmospheric oxygen. This process saves a considerable amount energy by eliminating ventilation systems and is characterized by very low operating costs.
Further advantages of the S&P system:
RIB systems are characterized by very low energy consumption and excellent effluent results. The size, surface area and number of discs can be adapted to meet the system requirements
Wastewater purification predominantly takes place during the biological stage. In redox processes, microorganisms feed on and metabolise the pollution load in the water.
Through targeted process management, taking into account the necessary environmental conditions, the microorganisms already present in the wastewater settle on the discs. Depending on the nutrients available, it is possible to observe how different biocenoces settle on different discs along the course of the cascade, each biocenosis specialising on whichever nutrients are still available in the water. This naturally cultivates a comparatively high and therefore robust biodiversity.
In the aerobic environment, organic pollution is first oxidized before ammonium is converted into nitrate, which is far less damaging to the environment. This process is called nitrification.
Subsequently, in an anaerobic process, nitrate is converted into atmospheric nitrogen, which is then returned to the atmosphere as part of the natural nitrogen cycle. This process is called denitrification. In this way, highly polluted wastewater can be effectively treated using multiple biological stages, e.g. using upstream denitrification.
The resulting excess sludge is pumped to the sludge tank for further treatment. As the biomass remains fixed on the discs (sessile biomass), no activated return sludge is necessary, meaning fewer measurements and potential controlling errors.
Further advantages of this core system are:
The biofilm which forms on the biodiscs efficiently purifies the wastewater.