What is the typical shaft speed on a rotating biological contactor (RBC)?

The typical shaft speed on a rotating biological contactor (RBC) is generally around 1-2 rpm. This low rotational speed is crucial for the effective operation of the RBC, as it allows microorganisms to develop on the media while also ensuring adequate contact with the wastewater. At this speed, the rotating elements of the RBC can stay submerged part of the time, allowing for both biological treatment and oxygen transfer as a result of the exposed surface area.

Higher speeds may lead to excessive shear forces, which could damage the biofilm or interfere with the treatment process. Therefore, maintaining a shaft speed in the range of 1-2 rpm ensures that the RBC operates efficiently and effectively within the design parameters.