Abstract
This chapter introduces the working principles of rotating biological contactors. In operation, biomass grows on the surface of the disks and eventually covers the entire wetted surface. The rotation of the disks alternately contacts the biomass with organic matter in the wastewater and then with the atmosphere for the adsorption of oxygen. Key design and loading criteria are outlined. The design approach is based on soluble biochemical oxygen demand (BOD) per unit of surface area per day (soluble BOD/m2/day). The principal elements of a rotating biological contactor are explained. Common operational problems are discussed. Shaft failures have been the most serious equipment problem because of the loss of a process unit from service and the damage to a portion of the media. At the end of this chapter, readers should be able to describe the design and operation of standard rotating biological contactors.
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