HAS SOMETHING GONE FOUL WITH YOUR UV? THE IMPACT OF SLEEVE FOULING ON DELIVERED UV DOSE
Abstract:Ultraviolet light (UV) disinfection performance is dependent upon a number of key operations and maintenance issues. The importance of one of these issues, lamp sleeve cleaning, is frequently ignored during conventional UV design. Typical design seldom consider the sitespecific fouling potential of the water to be treated and to assume off-line manual chemical cleaning every one to two months, if at all. Such an approach can in some cases result in a dramatically reduced delivered UV dose due to rapid fouling of the protective quartz sleeves. Data presented in this paper indicates that UV light transmittance through a quartz sleeve can decrease from as little as <1% per day to more than 95% per day. Such potential variability in fouling rates requires an understanding of both the site-specific water quality issues and the types and employments of currently available UV system cleaning methods. Depending upon the fouling potential of the water, the use of off-line manual cleaning compared to automated mechanical/chemical cleaning can result in more than three times the operation and maintenance time, which comes at a significant cost.
Document Type: Research Article
Publication date: 2004-01-01
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