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Resolving UV Hydraulic Issues During Facility Start-Up

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Hydraulics are a key factor in the design and performance of UV disinfection systems. While hydraulic issues are best resolved during design, UV disinfection system hydraulics problems often become apparent during facility start-up. This paper discusses two case studies of UV disinfection system start-up hydraulic issues, how the issues were identified, and how they were resolved. Case Study 1 focuses on system inlet hydraulics, specifically hydraulic short-circuiting caused by 90-degree bends immediately prior to the UV reactors. A three-dimensional flow diffuser was developed which resulted in substantial improvement in inlet hydraulics, which was not achieved using baffle plates commonly used for flow conditioning. Case Study 2 focuses on system outlet hydraulics, specifically short-circuiting due to uneven flow split between channels. Improvements in weir gate controls were implemented to improve flow split between channels, while the limitations of such improvements were also apparent.

Keywords: Hydraulics; UV; short-circuiting; start-up

Document Type: Research Article


Publication date: January 1, 2009

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  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

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