AWWA ACE65272

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.

Product Details

Edition:

Vol. - No.

Published:

06/01/2007

Number of Pages:

44

File Size:

1 file , 3.6 MB