Seymour-Capilano Water Filtration Plant, Canada
With a daily capacity of 1.8 billion litres, the Seymour-Capilano water filtration plant in Metro, Vancouver, Canada, became operational in May 2010. It supplies safe and clean drinking water to the city's residents.
The Seymour-Capilano plant is Canada's largest water filtration plant and one of the biggest of its kind in North America. It is uses the world's largest ultraviolet disinfection facility and showcases a series of innovative features to maximise its energy efficiency. Extensive use has also been made of sustainable and environmental technologies in its design and construction.
In addition to the filtration and UV plants themselves, the project also includes a 16,000HP pumping station, an energy recovery facility and break head tank, an electrical substation, two 3.7m-diameter tunnels extending just more than 7km and new water storage clear-wells. An allied programme of work provided a new water main and undertook a major upgrade to the Seymour Falls Dam to meet current seismic standards.
The project budget was $820m, which attracted partial external funding. The Canadian Government and the Province of British Columbia jointly invested $100m in the plant.
British Columbia's local government grant programme provided $18m for a pumping station near Capilano Reservoir and Cleveland Dam. The Metro Vancouver budget sanctioned funding of $328m.
Greater Vancouver's increased water demand
Greater Vancouver's drinking water comes from reservoirs located in three watersheds, namely Seymour, Capilano and Coquitlam, with the Seymour and Capilano watersheds supplying some 75% of the region's drinking water.
The project was driven by tighter federal and provincial quality requirements and the regional medical health officers' demands for lower levels of turbidity, coupled with a predicted population increase of 800,000 during the next 20 years.
To meet these challenges and the increased demand, the Greater Vancouver Regional District (GVRD) decided to build a filtration plant in 2001 under the design-build-operate, public-private partnership mode (locally termed P3).
However, after a large public campaign, this contract was set aside to enable the new plant to remain in public hands.
Seymour-Capilano plant details
The facility, which has been built on an 8ha site in the Lower Seymour Conservation Reserve, treats water drawn from both Seymour and Capilano reservoirs. Water arrives from Seymour, approximately 11km to the north, along the existing 2.3m-diameter main, while the new twin tunnels convey Capilano water to and from the plant, the return arm being gravity-fed.
The plant design itself is largely conventional. Water from the two reservoirs enters a rapid-mix head works, where coagulant is added, before entering flocculation basins and subjected to a slow-mix process. The subsequent direct filtration phase uses a 2m-deep filter dual-media bed, consisting of anthracite and sand, and from here, the filtered water enters the UV disinfection unit.
Flowing into treated water storage clear-wells, the pH is then adjusted before the water enters the Capilano and Seymour distribution networks. UV disinfection was selected for the plant using mercury vapour lamps installed inside quartz protective sleeves, principally because of its proven effectiveness against both giardia and cryptosporidium. However, although the plant uses UV as its primary disinfection regime, secondary chlorination remains a feature, to guarantee the safety of the potable water travelling through the municipal distribution systems.
Design of the Seymour-Capilano filtration plant
The 37,000m³ plant consists of inlet blending, 12 flocculation cells, 48 filter cells, equipment galleries, an operation and maintenance complex, backwash equalisation and treatment facilities and a residue handling facility.
The plant is installed with $35m worth of equipment, including 24 flocculators, 48 filter underdrain systems, 24 UV reactors, switchgear, MCCs, transformers, generators, belt filter presses, blowers and sludge collection equipment. The transfer pipes have a 132in-diameter and layered with carbon steel. The Seymour-Capilano plant also includes a post-treatment facility.
Seymour-Capilano twin tunnels
The plant connects Seymour and Capilano water resources through underground twin tunnels. The twin tunnel is located at North Vancouver, British Columbia. Each tunnel is 3.8m in diameter and 7.1km in length.
It took six years to excavate, one year to install, and two years to fully operate the tunnels. The excavation and installation work was completed in 2012. The twin tunnels became fully operational in May 2015, marking the completion of the Seymour-Capilano filtration project.
Sustainable technologies at the Canadian filtration plant
With the plant itself being in a conservation reserve, unsurprisingly the project was planned in strict accord with the GVRD's Sustainable Region Initiative. As a result, it has drawn heavily on sustainable building, environmental technologies and best practices.
These includes the use of EcoSmart concrete, which reduces the greenhouse gas emissions of cement production and uses industrial by-products, such as fly ash, to reduce the demand for landfill.
Green roof technologies have been incorporated into the roofs of the clear-wells and filtration plant and measures have been put in place to reduce storm water run-off. An energy recovery facility and the associated break head tank recovers energy from the water in the gravity-fed tunnel between Seymour and Capilano, reducing the pressure of the water prior to its reaching the distribution system.
This recovered energy is used to generate electricity, which is either used by the GVRD or sold to the local power company.
The plant also uses ground source energy to heat and cool the entire facility, maximises its use of daylight and natural ventilation, and conserves energy and water. The site is re-planted with appropriate native species.
Contractors for Vancouver's Seymour-Capilano project
The project was sponsored by GVRD. Emerson Process Management provided the plant's digital automation, with instrumentation and controls from RTS and control hardware supplied by Norpac. AMEC delivered the facility training programme.
Greater Vancouver Water District (GVWD) is the owner of the project. Pacific Liaicon & Associates act as a consultant for the Seymour-Capilano water facility. Seymour-Cap Partnership, a joint venture of Frontier-Kemper, J F Shea, and Aecon, received a contract from Metro Vancouver to complete the twin water tunnels for GVWD in 2010.
Betty Lake Water Treatment Plant at CFB Wainwright was upgraded with a filtration system and an immersed membrane system in 2009.
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