Patent ID: 7699980

Claim:
A wastewater treatment system comprising: an uncovered activated sludge basin adapted to receive activated sludge and a stream of wastewater to yield a mixed liquor; an oxygenation system adapted to introduce high purity oxygen to the mixed liquor in the uncovered activated sludge basin; a clarifier fluidically coupled to the uncovered activated sludge basin and adapted to receive mixed liquor therefrom, the clarifier adapted for separating the sludge from the mixed liquor to produce an effluent; and an activated sludge line coupled to the clarifier and adapted to remove separated sludge from the clarifier; wherein the mixed liquor in the uncovered activated sludge basin has a solids loading of between about 3000 mg and about 10000 mg of suspended solids per liter of mixed liquor, and the mixed liquor in the uncovered activated sludge basin has a dissolved oxygen level in the range of between about 5 mg to 15 mg of oxygen per liter of mixed liquor.