The RBC Unit consists of polypropylene media attached to a central shaft and is supported by two bearings, which are mounted on the main steel frames at each end of the units. One of these frames include the fixing assembly for the motor-reduction gear box The RBC is rotated slowly through a direct drive reduction gearbox and is arranged so that around 40% proportion of its surface area is submerged in the effluent at any time. As the RBC rotates, the surface of the media is subjected alternately to sewage and air, encouraging an aerobic, biologically active film of micro-organisms (biomass) to become established on each side of the media sheets. This biologically active film grows in size, is self- regulating and oxides the pollutants in the sewage. The micro-organisms use the polluting material (measured as BOD) as a substrate (food) and as they do so, multiply in number, maintaining a specific biomass thickness to ensure optimum process efficiency.
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