Rotating Biological Contactor

A rotating biological contactor is a type of secondary treatment process using fixed film systems. It consists of a series of closely spaced, parallel discs mounted on a rotating shaft which is supported just above the surface of the waste water. Microorganisms grow on the surface of the discs where biological degradation of the wastewater pollutants takes place.

RBC is rotated slowly by a small electric motor through a reduction gearbox and is arranged so that a proportion of its surface area is submerged in the effluent at any one time. As the RBC rotates, the surface of the media is subjected alternately to waste water (sewage) and air, encouraging an aerobic, biologically active film of micro-organisms (biomass) to become established on each side of the media sheets.

Typical applications are municipal wastewater treatment, food and beverage waste water treatment, including meat packing, bakery, dairy, brewery, landfill leachate, refinery and petrochemical wastewater treatment, pulp and paper waste water treatment, septage treatment and many general industrial wastewaters.

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PROTEC is a privately owned company established in Doha, Qatar engaged in the fields of Engineering, Supply, Construction, Installation, Commissioning, Operation and Maintenance of various types of equipment for the Water, Waste Water, Energy, and Industrial markets.


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