Patent ID: 7077952

Claim:
An aerobic wastewater treatment system comprising, in combination: a first tank adapted to receive, mix and partially treat wastewater; a second tank adapted to hold wastewater; wherein the first tank discharges partially-treated wastewater to the second tank; a third tank containing an aerator and engineered filter media that facilitate and maintain microbial colonies that oxidize organic matter, retain solids, reduce nutrients, and inactivate pathogens to treat wastewater and discharge effluent which is relatively clean of pollutants and pathogens; and wherein the second tank includes a pump and control system operatively connected to the pump to control the frequency, interval, volume and rate of transfer of wastewater from the second tank to the third tank; wherein the first second and third tanks are configured so that wastewater makes a single pass through the third tank; wherein the third tank is adapted to maintain a constant volume of wastewater in the third tank; and wherein the pump and control system dose the third tank with pretreated wastewater from the second tank no faster than the microbial colonies in the third tank can transform pollutants in the wastewater while in the third tank.