Designing and Commissioning an Ultraviolet Light Disinfection ...

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Warden, WashingtonWarden UV Disinfection System• Began Operation June 2009• Typically 2 Modules On• Daily Total Coliform (TC) Testsmet standards continuously:< 2.2 TC/100 mL 7 day median< 23 TC/100 mL single sample• Continuous UVT Monitoring> 65 % UVT nearly continuously
UV Disinfection Design StandardsDesign Requirement(Media Filtration)Ephrata and Royal City (1)(pre-2000)Warden (2)(after 2005)Microorganism Coliform Bacteria VirusMeasure of MicrobialInactivationTurbidity Entering UV Reactor< 2.2 total coliform/100 mL 7-daymedian< 23 total coliform/100 mL singlesample< 2 NTU monthly average< 5 NTU at all times< 2.2 total coliform/100 mL 7-daymedian5-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 Transmittance (UVT) 65 percent 55 percentContinuous UVT TransmittanceMonitoringField Verification of DesignNoComply with Coliform Density Criteriafor Reclaimed WaterYesCheckpoint Bioassay (3)(1) Class “A” Reclaimed Water Disinfection Standards for the State of Washington(2) May 2003 NWRI Guidelines for Drinking Water and Water Reuse(3) Although the 2003 NWRI Guidelines include velocity profiling instead of checkpoint bioassays for field verification, checkpointbioassays are the current de facto standard.
Page 1 and 2: DESIGNING & COMMISSIONING AN ULTRAV
Page 3 and 4: Presentation Outline• Background
Page 6 and 7: Water Reclamation Facilities Warden
Page 8 and 9: Warden, WashingtonUV
Page 12 and 13: Checkpoint BioassayWarden WRF Check
Page 14 and 15: Checkpoint Bioassay Test Flow Schem
Page 16 and 17: Checkpoint Bioassay Test Setup
Page 18 and 19: Checkpoint Bioassay Test Results
Page 20 and 21: Acceptance of Checkpoint BioassayVe
Page 22 and 23: Acceptance of Checkpoint BioassayAc
Page 24 and 25: Acceptance of Checkpoint BioassayEx
Page 26: Questions

Designing and Commissioning an Ultraviolet Light Disinfection ...

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