During the predesign of the Coquitlam Ultraviolet (UV) Disinfection Project, bench- and full-scale studies were
conducted at the Coquitlam Facility evaluating the impact of ozone dose on water quality, namely
UV transmittance (UVT) and disinfection byproducts (DBP) formation potential. An ozone dose of
2 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 1
mg/L. Based on historical water quality and bench- and full-scale studies, a life-cycle cost
comparison 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 91
percent. Life-cycle costs varied between $17.9 million for MP and $26.5 million for LPHO at 87
percent UVT. At a UVT of 91 percent the overall costs were reduced significantly, and ranged
between $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 the
fouling potential of the ozonated water on MP and LPHO UV quartz sleeves. Includes 3 references, tables, figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 3.6 MB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 44 |
| Published : | 06/01/2007 |
