Plant improvements
To accommodate population growth, the Annacis Island Wastewater Treatment Plant is undergoing a major expansion to increase treatment capacity to serve 1.5 million people.
There are approximately 20 projects as part of the on-site improvements in various stages of design and construction. This phased expansion includes seismic upgrades, new odour control facilities, a three-story control systems and laboratory building, and a co-generation facility to make better use of green energy captured on site.
The development of a new digester and regional biosolids dryer is underway to enhance solids treatment and help turn the byproducts of wastewater treatment into a renewable alternative fuel for the region’s industries. Both are anticipated to be complete by 2033. The new outfall pipe construction continues and is expected to be in service by 2025.
Outfall
Treated wastewater from the Annacis Island Wastewater Treatment Plant is released into the Fraser River through an existing outfall pipe. A new outfall pipe and diffuser system is being installed, which will involve constructing an approximately 1-kilometre-long tunnel from the plant to the river.
The new outfall location and design will ensure that treated wastewater disperses over a broad area underwater to maximize dilution and minimize environmental impact. The new pipe is expected to meet regional growth needs for the next 100 years while ensuring greater seismic resilience and continuous, reliable, and safe management of the region’s wastewater. Construction began in 2019 and will be completed in 2025.