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For systems considering ultraviolet (UV) disinfectionand requiring virus inactivation of 3 to 4logs, adenovirus appears likely to be the limitingorganism in determining reactor design and UVdose. In its Long Term 2 Enhanced Surface WaterTreatment Rule regulations, the U.S. EnvironmentalProtection Agency reported that inactivation ofadenoviruses to a level of 4 logs requires a UV doseof 186 mJ/cmsup2/sup.Recent bench-scale studies indicate that full-scalemedium-pressure (MP) UV systems may be capableof achieving significant inactivation of adenovirusat lower UV doses than are possible with low-pressuresystems. In this study, a protocol for field-scaletesting and validation of adenovirus disinfection byMP UV light was developed and used to perform alive adenovirus challenge test showing the level ofadenovirus inactivation possible in a field-scale UVdisinfection system. The reactor studied here demonstratedthat MP UV irradiation technology canachieve 4-log reduction at economically viableUV doses lower than 100 mJ/cmsup2/sup. Includes 16 references, tables, figures.

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Edition: Vol. 101 - No. 4 Published: 04/01/2009 Number of Pages: 10 File Size: 1 file , 1000 KB