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Kitchener Wastewater Treatment Plant Phase 3 – Headworks and Secondary Treatment Upgrade

Kitchener, ON

Contract Value:

$105.9 million

Prime Consultant:


Project Owner:

Regional Municipality of Waterloo

Contract Format:


Contract Duration:


The Kitchener Wastewater Treatment Plant is a secondary treatment facility that was originally built in the early 1960s and expanded in the mid-1970s. Effluent from the facility is disinfected prior to being discharged in the Grand River.

Graham’s scope of work includes upgrades to and construction of a new headworks building, which includes influent channels, new grit vortex units, chemical storage tanks, blowers, diffusers and upgrades to the existing ultraviolet building. The secondary treatment scope includes construction of a new primary effluent chamber and two new trains. Each train included two aeration tanks, three secondary clarifiers and return activated sludge (“RAS”) / waste activated sludge (“WAS”) stations. New blowers are being installed in the existing blower building to service the additional secondary treatment and an expansion to accommodate new electrical distribution for the expansion. Extensive underground works is required to provide influent and effluent to the new treatment system that include various piping materials up to 3.0 meters in diameter. Work also includes installation of all associated electrical, heating, ventilating and air conditioning, plumbing, effluent water, potable water, hot water, gas detection and supervisory control and data acquisition (“SCADA”) systems.

Construction challenges included extensive dewatering, working within an operating facility, and maintaining the existing process during multiple shut-downs and isolations. The project is also staged due to the requirement of C4 (tertiary building under construction) to allow the demolition and reconstruction of RAS Station 2.