As bacteria (biological sludge) form on the rotating disks and emerge from the water, they naturally draw the oxygen they need to sustain their activities from the air. This process leads to a rapid increase in the number of bacteria. Wastewater pollutants cause microorganisms to multiply on the surface of the rotating biological contactor(RBCs) as they biologically break down. Rotating biological contactor (RBCs) can resist fluctuations in organic load. During this process, microorganisms require oxygen and essential nutrients for growth to sustain their lives. Oxygen is obtained from the atmosphere as the disks rotate. As microorganisms grow, the accumulated microorganisms on the surface of the rotating disks can continue to grow until they are separated from the environment by the rotational force. The thickness of the biological sludge on the disks can vary between 1-2.5 mm, and the sludge, becoming heavier, detaches from the disk due to its own weight as it decomposes. Therefore, there is no need to clean the disks. Subsequently, the wastewater discharged from the RBC is sent to the sedimentation unit, where suspended solids/microorganisms detached from the RBC settle.