• Town of Collierville, Tennessee
• City of Winchester, Kentucky
• City of Alcoa, Tennessee
• Harpeth Valley Utility District
• Morehead Utility Plant Board
• City of Elizabethton, Tennessee

Northwest Wastewater Treatment Plant

Owner

Town of Collierville, Tennessee
500 Keough Rd.
Collierville, Tennessee 38017
Bill Kelp
(901) 853-3215

Engineer

Allen and Hoshell
1661 International Drive
Memphis, Tennessee 38120
Ben Pearson, PE
(901) 261-4650

Contract Amount

$20 million

Year Completed

2008

W. Rogers Company expanded the Northwest Wastewater Treatment Plant from 3 MGD to 6 MGD. This project consisted of the installation of a new screw pump in the existing influent pumping station and the construction of a new second stage influent pumping station. The main process stream included the construction of a new bar screen structure with two new mechanically cleaned bar screens, one manually cleaned bar screen, and a screenings conveyor; a new grit chamber with one new vortex-type grit removal unit and a grit classifier; two new oxidation basins with three 150 hp aerators in each basin and two (2) new 100 foot diameter final clarifiers.

The sludge process included the construction of a new RAS/WAS pumping station; a new 50 foot diameter gravity thickener with aluminum dome cover; a new solids handling building with one new two meter belt filter press, belt conveyor and polymer feed system.

The expansion also included construction of a drain pumping station, chemical feed and storage facilities for sodium hydroxide, sodium bisulfate, sodium hypochlorite and ferrous chloride; modification to the existing chlorine feed system; installation of odor control for the headwork facilities and the solid handling facilities.