Inventors:
Ricky C. Clifft - Paragould AR
Melrose T. Garrett - Houston TX
International Classification:
C02F 326
Abstract:
An aerobic wastewater treatment system including an aeration tank, the interior of the aeration tank being divided into at least a first chamber and a last chamber, each of the chambers having a lower portion and an upper portion; structure for allowing influent wastewater to be treated and return sludge to enter the lower portion of the first chamber of the aeration tank; structure for allowing mixed liquor to flow sequentially through the lower portions of each of the chambers; an effluent outlet associated with the last chamber of the aeration tank for allowing mixed liquor to exit the aeration tank; agitator structure associated with each chamber of the aeration tank for enhancing oxygen transfer from the upper to the lower portions of each chamber; structure for introducing high-purity oxygen into the first chamber of the aeration tank and for maintaining the pressure in the upper portion of the first chamber of the aeration tank to at or below existing atmospheric pressure; structure for controlling gas passage sequentially through the upper portions of each of the chambers; and structure associated with the last chamber of the aeration tank for removing gas by vacuum from the last chamber of the aeration tank and for maintaining a near constant dissolved oxygen content in the effluent from the last chamber.