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Bonnybrook Wastewater Treatment Plant Expansion Program

Expanding the world’s largest cold-weather BNR plant

  • 135M


  • $500M

    Construction Value

  • Calgary, Alberta

    Calgary, Alberta

Increasing Calgary's wastewater treatment capabilities

The Bonnybrook Wastewater Treatment Plant is one of the largest biological nutrient removal (BNR) plants in Canada and the largest cold-weather BNR plant in the world. Influent temperatures reach a minimum of 10 C with air temperatures as low as -40 C in the winter.

Population growth and increasingly stringent treatment standards have been the primary drivers for numerous plant expansions since it was constructed in 1932. Currently, the plant provides treatment up to an average capacity of 396 ML/d and peak capacity of 1,069 ML/d to serve 946,000 Equivalent Population (EP), but it is nearing its installed capacity.

Upgrade projects for Secondary Plants B and C are under development as interim measures to provide additional capacity. Parallel to these upgrades, the design of a full treatment plant expansion (Plant D) is currently underway to increase the installed capacity by 325,000 EP (135 ML/d). Peak flow capacity will be increased to 1,390 ML/d.

The project includes upgrades to primary influent conveyance, primary treatment, primary effluent conveyance, BNR process, secondary clarification, effluent filtration, UV disinfection, plant outfall, chemical and process utility systems, secondary sludge thickening, secondary sludge dewatering, thermal hydrolysis of dewatered waste activated sludge, sludge digestion, and biogas management.

At a Glance

Meet Our Team

Patrick Doyle, Senior Associate

I strive to support and elevate the people around me to build trust, forge strong relations, and create high performing teams.

Jonathan Fitzpatrick, Principal, Operational Technologies Practice Lead

Digital solutions have the power to address many of the most intractable problems facing the Water sector while also lowering operational costs.
Jonathan Fitzpatrick Principal, Operational Technologies Practice Lead Read More

Theresa Luby, Engineer

Water is essential to all life, and my work helps to protect and utilize it responsibly through new and innovative designs.

Ryan Roberts, Executive Vice President, Water

I believe project success is achieved through open, honest communication and a clear understanding of client expectations and deliverables.
Ryan Roberts Executive Vice President, Water Read More

Francis Rozsa, Principal, Water

Water is our most valuable resource, and we must strive to find better ways to protect it.

Joe Uglevich, Senior Vice President, Director of Water Project Delivery

My experience has proven that successful teams include technical staff, clients, and stakeholders working together towards a common goal.
Joe Uglevich Senior Vice President, Director of Water Project Delivery Read More

Matt Wood, Senior Associate

I help build flood resilient communities by restoring rivers and riparian areas, designing riverine infrastructure, and flood mitigations.

Daniel McLellan, Associate, Geotechnical Engineer

Flipping your perspective to consider clients’ problems is key to building effective solutions.
Daniel McLellan Associate, Geotechnical Engineer Read More

Patrick Doyle

Senior Associate

Jonathan Fitzpatrick

Principal, Operational Technologies Practice Lead

Theresa Luby


Ryan Roberts

Executive Vice President, Water

Francis Rozsa

Principal, Water

Joe Uglevich

Senior Vice President, Director of Water Project Delivery

Matt Wood

Senior Associate

Daniel McLellan

Associate, Geotechnical Engineer

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Build Date: 2022-44-28 08:44:26