Town of Manhattan, MT 400,000 GPD Bio-wheel plant case study


Courtesy of H2O Innovation

The Manhattan treatment plant is a 400,000 GPD plant in two trains, containing six 24 x 5.0 Bio-WheelTM. It is able to nitrify and denitrify, with two anoxic basins ahead of the aeration basins. Two conventional flight and scraper clarifiers are used. Three Penn Valley RA S/MLSS pumps are located in a separate pump room. The plant is designed for a future expansion to 0.8 MGD. At this time the effluent limits are 20 mg/L for BOD5 and TSS, however the plant is designed for ultimate limits of 10 mg/L for BOD5, TSS, total Nitrogen and less than 1 mg/L for Phosphorus which may be imposed soon because of its discharge into the Gallatin River.

The plant is of reinforced cast-in-place concrete construction. Each train is 20’ wide by 14’ deep. The general contractor was Johnson-Wilson Construction of Great Falls, Montana. Construction was begun in Spring 2007, with placement of the concrete walls being the first priority.

Following completion of the concrete work, the Bio-WheelTM were installed in the aeration tanks. Note the patented “A-Frames” which suspend the wheels from the top of the concrete walls, so that the wheels may be removed without dewatering the tank or taking the train out of service.

A side-on view of the “A-Frames.” Six 1½” stainless steel bolts hold the frames down to the top of the tank. The trunnion blocks with their UH MW bushings are preassembled in the “A-Frames.”

Each frame is leveled in both directions before the installation of the wheel axle. Notice the lifting eyes on the top angles of the frames.

Each wheel is assembled in the tank. The wheel in the center is awaiting installation of the last six rows of plates.

Three rows of plastic plates are preassembled on the galvanized end plates, ready for installation. Each row is is 8’-4” (2.5 m) in length.

The completed 24 x 5.0 Bio-Wheel™ are 20’-0” (6 m) wide by 14’-9” (4.5 m) in diameter and contain 31,500 sq. ft. (2930 sq. m.) of fixed film surface area.

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