Screw pumps elevate screened influent for retention in the grit chambers . Once elevated, fluids flow toward two oxidation ditches. Vertically mounted mechanical aerators are used to impart oxygen and at the same time provide horizontal velocity to the liquids to prevent solid from settling in two oxidation ditches. In a park like setting, two clarifiers separate the bacterial floc from the treated water. Clarifiers are 90' in diameter and 13' deep and each clarifier holds 620,000 gallons.
Covers prevent freezing during Wyoming's cold winters.
An operating range of 12 to 20 percent Return Activated Sludge Rate is a striking contrast to a suggested 50 to 200 percent for extended aeration systems. This allows less hydraulic load on the aeration ditch and clarifier. One might think that rising sludge in the clarifier would be a problem, however it never has. Class A Excess activated sludge from the secondary process is separated at the sludge wet well and pumped to two aerobic digesters.