Treating Water in a Remote Location Westech Package Treatment Plant

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Treating Water in a Remote Location WesTech Package Treatment Plant CASE STUDY Location: Cross Lake, Manitoba, Canada Raw water from Cross Lake has turbidities The WesTech-provided PLC controls allow Owner: Cross Lake First Nation ranging from 9-12 NTU and raw water color for automatic operation of the treatment unit Engineer: SEG Engineering as high as 126 Pt-Co units. and chemical feed system, as well as auto- Contractor: Wescan Mechanical Services mated backwashing of the filters. Backwash of the roughing filter is done using untreated Package Treatment Plant raw water, whereas the polishing filter is Substantial Problem In the fall of 2004, WesTech Engineering periodically backwashed with treated water. was contracted to supply a 350 gpm Pack- In 2003, SEG Engineering was contracted age Treatment Plant. The Package Treatment In May of 2005, during a seven-day to design a new water treatment plant for Plant is a skid-mounted treatment unit that performance test, WesTech successfully the Cross Lake First Nation. Located utilizes a buoyant, up-flow, coarse media demonstrated that the Package Treatment approximately 370 miles north of Winnipeg, roughing filter followed by a downflow, fine- Plant could meet or exceed all of the this remote community of 5,000 people is media polishing filter. performance criteria required and the plant only accessible by air or, during the cold was turned over to the Cross Lake First Nation. winter months, by ice roads. Inaccessibility, Water enters the Package Treatment Plant cold weather, and high raw-water color and flows up through 48” of 3-5 mm were only a few of the design challenges polyethylene media where approximately that SEG Engineering faced for this new 85% of the raw water turbidity and color is water treatment plant. After much evaluation, removed. The buoyant media is retained in SEG Engineering concluded that a packaged the roughing filter by a stainless steel screen. water treatment plant utilizing two-stage The flow is then fed onto the polishing filtration was the best available technology filter which has 18” of 1.1 mm anthracite, for the project. 9” of 0.55mm silica sand, and 3” of 0.40 mm garnet. The polishing filter media is Simple Solution supported by an all stainless-steel, direct- retention underdrain. The Package Treatment Based on this evaluation, SEG Engineering Plant is fabricated from marine-grade developed a detailed equipment specification aluminum, eliminating the need for coating that included minimum outlet performance maintenance associated with epoxy-coated requirements. These performance specifica- carbon steel. tions required outlet turbidities of less than 0.1 NTU, color less than 5 Pt-Co units, and Trihalomethanes less than 60 μg/L. © WesTech Engineering, Inc. 2015 Tel: 801.265.1000 | westech-inc.com .

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