The Multi Channel Reactor of US Filter design in ORBAL process is a unique concept for conventional activated sludge process covering nutrient removal also. These units can be provided with simultaneous nitrification - de-nitrification process to reduce the overall oxygen requirement. These units typically involve three concentric channels each of which operate at different dissolved oxygen levels. The key to the ORBALsystem's efficiency is unique non-metallic ORBAL disc which are mounted in numbers on a horizontal shaft supported on the tank walls in such way that part of these Discs remain submerged in water as they rotate during the operation. The rotating disc provides about one foot per second velocity for the wastewater inside each of these channels to ensure that solids remain under suspension by creating optimum mixing conditions at an incredibly low 1 HP power consumption per 100,000 - 200,000 gallons.

ORBAL is an excellent concept to prevent Clarifier solids wash out during high flows by redirecting the inflow to inner channel instead of the outer channel.

These units can be provided with single or double channels also to meet the process requirement.