Wastewater New York State Practice Exam

Are Rotating Biological Contactor (RBC) Units usually installed in a concrete tank so that wastewater almost reaches the shaft?

1. True

2. False

3. Depends on the manufacturer

4. Only in certain climates

The correct answer is: True

Rotating Biological Contactors (RBC) are indeed typically installed in concrete tanks, which allows them to function effectively. The design of these tanks is such that wastewater reaches the shaft of the RBC units. This is essential for the operation of RBCs, as the wastewater needs to come into contact with the biofilm that develops on the rotating disks of the unit. This contact facilitates the biological treatment process, where microorganisms break down organic matter as the disks rotate in and out of the wastewater. By maintaining the appropriate wastewater level within the tank, the RBC can optimize its treatment capability, promoting adequate oxygen transfer and nutrient removal. If the design did not allow for sufficient wastewater to contact the RBC surfaces, the treatment efficiency would be significantly reduced. This understanding is fundamental for anyone studying wastewater treatment processes and highlights the importance of proper tank design in achieving effective treatment results.