What are rotating biological contactors (RBCs)?

Rotating biological contactors (RBCs) are indeed classified as another type of attached growth biological process. In this system, microorganisms grow on the surface of rotating discs that are partially submerged in wastewater. As these discs rotate, they alternate between the wastewater and the air, allowing for the transfer of oxygen to the microorganisms. This process facilitates the breakdown of organic materials present in the wastewater through biological activity.

RBCs are particularly effective in treating wastewater because they utilize the natural processes of microorganisms to treat effluents, making them energy-efficient. The design allows for a small footprint compared to other treatment systems, thus enhancing their application in various settings.

The other options do not accurately describe RBCs. They are not an anaerobic treatment method, they do not focus on chemical treatment, and they are not considered an advanced filtration technology. Instead, RBCs rely solely on the biological processes involving attached growth organisms to achieve treatment goals.