Designing and Commissioning an Ultraviolet Light Disinfection ...
Designing and Commissioning an Ultraviolet Light Disinfection ...
Designing and Commissioning an Ultraviolet Light Disinfection ...
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UV <strong>Disinfection</strong> Design St<strong><strong>an</strong>d</strong>ardsDesign Requirement(Media Filtration)Ephrata <strong><strong>an</strong>d</strong> Royal City (1)(pre-2000)Warden (2)(after 2005)Microorg<strong>an</strong>ism Coliform Bacteria VirusMeasure of MicrobialInactivationTurbidity Entering UV Reactor< 2.2 total coliform/100 mL 7-daymedi<strong>an</strong>< 23 total coliform/100 mL singlesample< 2 NTU monthly average< 5 NTU at all times< 2.2 total coliform/100 mL 7-daymedi<strong>an</strong>5-log Virus Inactivation< 2 NTU 24-hour average< 5 NTU at all timesUV Dose at Maximum Day Flow 100 mJ/cm 2 100 mJ/cm 2UV Tr<strong>an</strong>smitt<strong>an</strong>ce (UVT) 65 percent 55 percentContinuous UVT Tr<strong>an</strong>smitt<strong>an</strong>ceMonitoringField Verification of DesignNoComply with Coliform Density Criteriafor Reclaimed WaterYesCheckpoint Bioassay (3)(1) Class “A” Reclaimed Water <strong>Disinfection</strong> St<strong><strong>an</strong>d</strong>ards for the State of Washington(2) May 2003 NWRI Guidelines for Drinking Water <strong><strong>an</strong>d</strong> Water Reuse(3) Although the 2003 NWRI Guidelines include velocity profiling instead of checkpoint bioassays for field verification, checkpointbioassays are the current de facto st<strong><strong>an</strong>d</strong>ard.
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