Patent ID: 7157001

Claim:
A process for treating influent wastewater from a sewer system comprising the steps of: (A) removing solids contained in the influent to create a solids-depleted preliminary effluent (PrE) and to protect downstream systems from premature failure due to wear from solid particles; (B) removing suspended solids from the PrE to produce a suspended solids-depleted primary effluent (PE); (C) treating the PE biologically by exposing it to bacteria-supporting media in a trickling filter that remove soluble organic material, thereby creating a trickling filter effluent (TFE); (D) allowing suspended bacteria in the TFE to settle to create a secondary effluent (SE); and (E) subjecting the SE to tertiary treatment including granular activated carbon pressure filters to remove PCB's and other compounds to create a carbon filter effluent (CFE), so that sand filtration prior to step (E) can be avoided and solids plus soluble organic materials can be removed in one step.