Rotating biocontactor (RBC)

The principle of this process is the fixing of the biomass on supports (disks, rollers, trapezoidal elements) made from synthetic material (polystyrene, PVC, etc.) presenting a maximum exchange surface.

These biological supports are mounted on a horizontal axis and are partially submerged in the waste water.

The axis is rotated and the bacteria forming the biomass pass successively from a nutrition phase to an aeration phase.

The excess biomass is naturally detached from the support and is carried by the flow of waste water.

The separation of these elements takes place in a clarifier (or settler) where the biomass will settle, thanks to its greater density.

This process is particularly suited to configurations where the load variation is considerable as the fixed biomass allows more rapid reactivation of the biology than in standard activated sludge. In addition, it is more economical in terms of energy.

This process is especially suitable for small treatment plants where advanced nitrogen treatment is not required.