What are the two types of drive mechanisms used in Rotating Biological Contactors (RBCs)?

The drive mechanisms used in Rotating Biological Contactors (RBCs) are primarily categorized into two types: air (sloughing) and mechanical.

In RBCs, the mechanical drive system is essential for rotating the disks that are partially submerged in wastewater, allowing biological treatment to occur over the surface of these disks. This mechanical drive can consist of motors and gears that facilitate continuous movement and consistent exposure of the biofilm to the wastewater.

The term "air (sloughing)" refers to a process that can occur in the RBC system where air is introduced to the system to assist in the sloughing off of excess biological growth from the surface of the disks. This helps to maintain an optimal biofilm thickness and ensure that the treatment process remains efficient. The incorporation of air can improve the aeration process, ensuring microorganisms receive adequate oxygen for metabolism, further enhancing the biological treatment capabilities of the RBCs.

This combination of mechanical drive for rotation and air assistance for sloughing constitutes the effective operational framework for RBCs, making these mechanisms vital for their functionality in wastewater treatment.