, Volume 3, Issue 2, pp 69-80
Date: 30 Jun 2001

Ultraviolet disinfection application to a wastewater treatment plant

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Abstract.

Considering most benefits of using ultraviolet (UV) radiation, the Lacey, Olympia, Tumwater and Thurston County (LOTT) wastewater treatment plant located in the City of Olympia was the first major POTW on the U.S. West Coast to install and successfully operate a UV disinfection system that processes about 22 MGD of wastewater. The LOTT's secondary treatment process is a biological nutrients removal system, and has the capabilities of removing more than 90% total suspended solids (TSS), biological oxygen demand, and nutrients (including phosphorus). This high quality effluent with low TSS contributes to achieving a highly efficient UV disinfection system with monthly geometric mean values in the range of 4–48 fecal coliform per 100 ml, well below the NPDES permit limit set to 200 counts per 100 ml. This paper summarizes the results and conclusion from the pilot study conducted at LOTT prior to installing a full-scale UV system, with references to other updated work reported elsewhere.

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