This is also an attached growth process. Rotating contactors consist of closely spaced discs on a central drive shaft. These disc are rotated very slowly ( 0.5 to 15 rpm) through the effluent so that about 40-50 percent of disc surfaces are submerged. The discs may be flat or corrugated to increase the area. Generally synthetic materials such as PVC and polystyrene are used for manufacture of
these discs. The discs are stacked and provided with baffles to minimize the short circuiting. As the discs rotate through effluent, a microbial film forms. These films will be alternately exposed to air and submerged in wastewater during rotation.During the submergence the nutrients are absorbed from wastewater. Oxygen needed for metabolism is absorbed during aeration.
these discs. The discs are stacked and provided with baffles to minimize the short circuiting. As the discs rotate through effluent, a microbial film forms. These films will be alternately exposed to air and submerged in wastewater during rotation.During the submergence the nutrients are absorbed from wastewater. Oxygen needed for metabolism is absorbed during aeration.
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