The City of Calgary's Bearspaw Water Treatment Plant is presently being upgraded to
increase capacity from 420 million liters per day (ML/d) to 550 ML/d, and to enable it to
meet increasingly stringent treated water quality and environmental standards. One of
the major components of this upgrade is a new Residuals Treatment Facility (RTF) that
will protect the environment by recycling all the major process waste streams, rather than
discharging them to the Bow River. A major benefit of this initiative is that it will allow
the City to optimize use of their existing surface water allocation from the Bow River
Basin.
The new 54 ML/d Bearspaw Residuals Treatment Facility (RTF) manages pretreatment
clarifier waste, filter backwash waste, filter-to-waste, and process overflows. The
residuals treatment process includes flow equalization, thickening, and dewatering. Filter
backwash waste and clarifier waste sludge are flow equalized in the equalization tanks,
and gravity fed to clarifier thickeners. Clarified effluent from the thickeners will be
recycled to the head of a new ballasted-flocculation pretreatment process, while
underflow sludge will be dewatered using centrifuges. The Residuals Treatment Facility
also includes a pump station to recycle filter-to-waste flow to the head of the main plant
process for re-processing.
Due to the magnitude of the project, and a tight regulatory deadline, the City chose to
employ a Construction Manager for project implementation. This allowed the design to
be phased, and construction to start six months sooner than if a conventional design-bid-
build project delivery method had been used. There were a total of seven
equipment procurement packages and three major construction tenders produced for
the project.
This leading edge project will be the first of its type in Alberta, Canada. The RTF will be
commissioned in 2006, and full recycling will commence in 2007 once construction of
the new Pretreatment Facility is completed. Includes tables, figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 890 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 10 |
| Published : | 06/01/2006 |
