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The Region of Peel has embarked on a major investment in its drinking water infrastructure to meet thedemands of a growing service area just west of Toronto, Ontario. Water quality challenges of the sourcewater include enhanced pathogen risk, periodic taste and odor events, rapid temperature changes.Treatment objectives were identified that exceed local regulatory requirements (Cryptosporidiuminactivation, disinfection byproducts, and water stability) and respond to concerns of the public (preservegreen space, reduce taste and odor, and manage endocrine disrupting compounds). Pilot testing withthree membrane suppliers was completed in 2003. The impacts of pre-treating Lake Ontario with ozoneand biological carbon contactors (BACC) on membrane performance (flux, cleaning frequency, etc.) wereexamined during a 6-month pilot study, supplemented by bench-scale testing. Prior to this study, therewas minimal industry experience with the ozone + BACC + membrane process, particularly when treatingGreat Lakes water. The study demonstrated improvements in membrane performance as a result of thepretreatment (ozone + BACC). After a detailed pre-purchase evaluation process, Zenon Environmental ofOakville, Ontario was selected to supply the immersed membrane system. A new generation ZeeWeed-1000 module and cassette will be showcased in the new facility.In early 2004, the Region began the detailed design of the capacity expansion of the Lakeview WTP withozone, BAC and membranes. The project is to commence construction on early 2005. The paperdiscusses the unique design issues associated with integrating these processes into such a large facility,one of the world's largest at a year-round base-load capacity of 363 ML/d (95.4 MGD) at 2C. The plantis being designed entirely in 3D. Includes table, figures.

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Edition: Vol. - No. Published: 03/01/2005 Number of Pages: 10File Size: 1 file , 900 KB