Grand Glaize Wastewater Treatment Plant Expansion

The existing MSD Grand Glaize WWTP had become undersized due to local developments and required an increase in capacity from 16 million gallons per day (MGD) to 21 MGD. KCI was awarded this publicly bid project, which consisted of replacement of coarse and fine screens, addition of a screening washer and compactor, construction of four primary and two final clarifiers, a primary sludge pump station, two concrete aeration basins, a blower building and return sludge pump station. Additionally the project included modifications to three existing aeration basins and four final clarifiers, and the addition of an odor control system. This work was accomplished through close coordination with the existing plant to achieve nine intermediate project completion milestone dates, so that the new and existing plants could be integrated. This integration also included the challenge of numerous tie-ins to live piping systems, while working with aging diversion gates that didn’t necessarily divert all of the flow they were supposed to.

Size: 21 Million Gallons per Day

Owner: Metropolitan St. Louis Sewer District

KCI Role: General Contractor

Value: $28,900,000

Delivery Method: Bid Build

Completion: December 2008

Designer: HDR Engineering

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