Effluent from the Bardenpho process is transported by pipe to a splitter box and directed into the final clarifiers for separation of the biosolids. Clear water results from the separation and is collected by radial weirs and transported for further treatment.
As the biosolids settle under calm conditions in the tanks, a collector mechanism directs the solids to the return activated sludge (RAS) pump area, where a portion of the flow is returned to the Bardenpho basins for repeated treatment.
The recycled biomass also serves as a seed material for incoming raw waste. A portion of the settled biomass is also wasted to the biosolids treatment process.