Bonnybrook Wastewater Treatment Plant D Expansion

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Image Credit: City of Calgary

Ranking for 2017: 77

Industry Sector: Other

Specific Sector: Water-Wastewater

Range: $500,000,000 - $1 billion

Project Value: $600,000,000

Government Funds Involved:

Funding Source: Public

Location: Calgary, Alberta

Estimated End Date of Substantial Completion: 2022


One of Calgary’s three wastewater treatment plants, Bonnybrook is undergoing an expansion with the plant estimated to be able to service an additional equivalent population of 325,000 people. When construction is completed in 2022, the facility will service a population of 1.366 million people. The Plant D expansion is the largest project of the overall upgrade and includes new primary and secondary clarifiers, new bioreactors with biological nutrient removal system, new treated effluent filtration facility, new Thermal Hydrolysis Process facility, and a new flood berm. The city is also upgrading the existing ultraviolet disinfection system, digesters, and primary sludge thickening systems. A cofferdam has been installed south of the CN Rail river crossing near the project site, which is allowing for the installation of new effluent diffusers. The cofferdam is expected to stay in place until April 2019.


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