Vancouver to upgrade trickle filter solids wastewater treatment facility

Metro Vancouver is undertaking major upgrades to the world’s largest solids contact trickle filter facility.

The facility, known as the Annacis Island Wastewater Treatment Plant, will be upgraded to increase capacity, meet the needs of a growing population and protect essential utility operations from seismic events. Brown and Caldwell engineering firm will provide detailed design and construction engineering services for the project.

Located in Delta, British Columbia, the Annacis Island Wastewater Treatment Plant treats approximately 196 billion liters of wastewater per year (141 million gallons per day) serving approximately 1.25 million people in 14 Lower Mainland municipalities. It uses primary and secondary treatment technologies to remove organic matter from wastewater before it is safely discharged into the Fraser River, the world’s largest salmon river.

Part of a multi-year program of more than 20 projects to increase plant capacity, the newly launched project includes the design and construction of two new bacterial filters and an associated pumping station. The plant’s four existing centrifuges will be replaced with new, larger capacity units to improve dewatering efficiency and avoid costly and invasive expansion of the dewatering building. In addition, a modern maintenance workshop will be constructed so that staff can maintain the expanded facility.

When completed, the suite of upgrades will increase capacity to serve approximately 1.6 million people. The new facilities will be designed with consideration for future expansions and seismic resilience.

As principal consultants, Brown and Caldwell will lead program, project and quality management; detailed design; and site management. Lead sub-consultants EIC Solutions, Klohn Crippen Berger and JL Richards and Associates will provide electrical/instrumentation and controls; geotechnical and hydrogeological; and architectural design services, respectively.

A first essential component of the construction of new assets involves significant ground improvements to improve seismic performance. Complex groundwork includes hazard mitigation, geotechnical and resiliency considerations to protect existing structures and utilities during installation. The success of the project depends above all on the careful scheduling of construction activities in order to maintain the integrity of the plant and to minimize operational disruptions during work on site.

“We salute Metro Vancouver’s unwavering commitment to environmental stewardship while continuing to serve its communities through innovative and sustainable practices,” said Mike Thorstenson, Brown and Caldwell Program Director. “Our team relishes the opportunity to help write the next chapter of this monumental expansion and to maintain the Annacis plant as a premier processing facility in North America. »

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