• AWWA ACE65272
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AWWA ACE65272

  • Combining UV Technology with an Existing Unfiltered Water Ozone System
  • Conference Proceeding by American Water Works Association, 06/01/2007
  • Publisher: AWWA

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During the predesign of the Coquitlam Ultraviolet (UV) Disinfection Project, bench- and full-scale studies wereconducted at the Coquitlam Facility evaluating the impact of ozone dose on water quality, namelyUV transmittance (UVT) and disinfection byproducts (DBP) formation potential. An ozone dose of2 mg/L was deemed necessary to limit haloacetic acid (HAA5) formation to 60 µg/L.Trihalomethanes (THM) were easily kept under 80 µg/L using an ozone dose of approximately 1mg/L. Based on historical water quality and bench- and full-scale studies, a life-cycle costcomparison was conducted for both medium pressure (MP) and low-pressure high-output (LPHO)UV lamp technologies. Two design UVTs were used during the preliminary evaluation, 87 and 91percent. Life-cycle costs varied between $17.9 million for MP and $26.5 million for LPHO at 87percent UVT. At a UVT of 91 percent the overall costs were reduced significantly, and rangedbetween $16.2 million and $21.5 million for MP and LPHO, respectively.A pilot-scale test is currently being conducted on-site, at the Coquitlam Facility, evaluating thefouling potential of the ozonated water on MP and LPHO UV quartz sleeves. Includes 3 references, tables, figures.

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