Sewage pre:clarification system - with trickling filter re-cycling side-stream to sealing basin inflow

摘要

A sewage pre-clarification system consists of a settling tank and a trickling filter which extracts a side stream from the tank outflow and feeds its run-off to the tank inlet. The trickling filter has a packing which exerts a biological action on the side stream; its sludge flocks add as collectors for the contents of the crude sewage. The advantages of the parallel connection of trickling filter and sedimentation tank instead of the conventional tandem connection results in an overall efficiency of 55-60% instead of the conventional 25-30%.