Rotating biological contactors is a remediation technology used in the secondary treatment of wastewater. This technology involves allowing wastewater to come in contact with a biological medium in order to facilitate the removal of contaminants. There are several different designs now available, but in its simplest form a rotary biological contactor (rbc) consists of a series of discs mounted on a shaft, which is driven so that the discs rotate at right angles to the flow of settled sewage. These rotating biological contractor units are usually installed in a concrete tank so that the surface of the wastewater passing through the tank almost reaches the shaft. This means that about 40% of the total surface area of the disks is always submerged. The shaft continually rotates at 1 to 2 rpm, and a layer of biological growth 2 to 4 mm thick is soon established on the wetted surface of each disk. These rotating biological contactors offer many advantages like the capability of handling a wide range of flows, low power requirements, low sludge requirements and excellent process control. The manufacturing and supplying of the rotating biological contactors is the prior function of the manufacturers in the industry due to its varied applications in different industries.
