Patent ID: 6998048

Claim:
A waste treatment system, comprising: an anoxic pretreatment tank adapted to receive raw untreated sewage having a mixture of solids and liquids, wherein said sewage within said anoxic tank separates into a sludge layer, a scum layer, and a liquid effluent layer between said sludge layer and said scum layer, wherein said anoxic tank is adapted to provide some effluent denitrification; a granular fixed film denitrification reactor connected to said anoxic tank, said denitrification reactor being adapted to denitrify a liquid effluent and provide some biochemical oxygen demand (BOD) removal from said effluent; and a membrane bioreactor connected to said denitrification reactor, said membrane bioreactor adapted to provide ultra and micro filtration of a denitrified effluent, retain biomass for BOD removal and nitrification; wherein said anoxic tank effluent is passed from the anoxic tank to the denitrification reactor for denitrification, wherein a denitrified effluent is passed from the denitrification reactor to the membrane bioreactor for filtration.