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The Town of Slave Lake is located in the north-central area of the Province of Alberta, Canada.The Town receives its water supply from Lesser Slave Lake. The existing conventionaltreatment plant was constructed in 1982 and has a hydraulic capacity of 7 ML/d (1.85 MGD). Aspart of the improvement program, chemical feed systems are upgraded based on jar testoptimization findings. A new powdered activated carbon feed system was installed by utilizingthe unused space of an old clearwell. New feed systems for polymer, acid and caustic were alsoinstalled. This enabled the Town to practice enhanced coagulation to achieve required organicremovals, taste and odor control, and to stabilize plant performance. Other upgrades includedincorporation of tube settlers into two of the three clarifier basins (to achieve future capacity),installation of automated sludge collection systems in the clarifiers, and the conversion of a thirdclarifier to a disinfectant contact tank to achieve required Giardia and viral inactivation. Filterunderdrains and media were also replaced.With such improvements and the practice of optimized enhanced coagulation, the watertreatment plant achieved all of its treatment goals (0.05 NTU turbidity, 20 particles [2 um]counts/mL). The upgrades also allowed the Town to extend the service life of the treatmentfacility beyond its original prediction, which could postpone a membrane upgrade by many moreyears. The success of this plant upgrade and process optimization enabled the conventionalfacility to produce water that is comparable to microfiltration-produced water. This paperdescribes the above upgrades and implementation of upgrades while maintaining production. Includes 6 references, table, figure.

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Edition: Vol. - No. Published: 06/01/2007 Number of Pages: 19File Size: 1 file , 7 MB