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Hydrovac Facility, Calgary, Alberta, Canada

A hydrovac facility collecting sediment from catchbasins and other stormwater infrastructure in Calgary, Alberta was upgraded in 2011. This facility upgrade included a pond system was designed to collect sediment in stages, allowing progressively smaller particles to settle from the water before being released back into the stormwater system. In order to allow this release, the City required that the total suspended solids (TSS) concentrations be reduced to a specifi ed maximum of 300 mg/L.

With the objective of obtaining the set criteria for TSS concentration, the settling pond alone was only able to achieve an estimated 2300 mg/L TSS target, leaving a signifi cant reduction margin remaining. With operating costs and maintenance as key considerations, the facility required that the remaining TSS concentration reduction be achieved with passive rather than mechanical processes, if possible.

Through its relationship with Imbrium Systems, an engineered stormwater treatment company that designs and develops stormwater treatment solutions, Lafarge was able to offer the Jellyfi sh® system as an alternative to this project.

For the hydrovac facility, the Jellyfi sh unit was installed downstream of the settling pond as a means of "polishing" the stormwater to reduce the sediment concentration to the levels desired.



The Jellyfish Filter (patent pending) is an engineered stormwater quality treatment technology featuring unique membrane fi ltration in a compact stand-alone treatment system that removes a high level and wide variety of stormwater pollutants. Exceptional pollutant removal is achieved at high treatment fl ow rates with minimal head loss and low maintenance costs. This unit consists of a fiberglass disc that holds a series of “tentacle” shaped fi lters and is housed by concrete manhole components.

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