BIOASSAY AND DOSE MONITORING PERFORMANCE OF A DRINKING WATER UV DISINFECTION SYSTEM FOR THE NORTH TAHOE PUBLIC UTILITY DISTRICT
Abstract:Trojan UVSwift™ 4L12 ultraviolet light disinfection reactors were validated as part of a full-scale water treatment plant installation (North Tahoe Public Utility District; Tahoe Vista, CA). The validation procedure was focused on verifying the accuracy of the Trojan UVDosimeter™ rather than on minimum intensity sensor readings (i.e., Sensor Setpoint Method). Thirty-seven measurements were taken; twenty measurements were taken with a lamp age of 2200 hours, and seventeen measurements were taken at a lamp age of 5000 hours. Various ballast settings were utilized, ranging from 30 percent to 100 percent. Two different water transmittance values were also utilized, 90 percent and 95 percent. The variations in lamp age, water transmittance, and ballast output were intended to allow for a wide variety of conditions whereby the UVDosimeter™ would be challenged for bioassay comparative analysis. The Trojan UVDosimeter™ appears to accurately report the UV dose when applied to the UVSwift™ 4L12 reactors, with no bias due to lamp aging or water transmittance.
Document Type: Research Article
Publication date: January 1, 2005
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