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uV Drinking Water Treatment

uV Drinking Water Treatment. Emerging Technologies. NSF/ANSI Standard 55. Evaluation of Microbiological Reduction Performance Capability Low Pressure uV Lamps 254nm Wavelength Performance Equated to Delivered Dose Class A 40 mJ /cm 2 With Sensor Technology – Unknown Water Supply

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uV Drinking Water Treatment

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  1. uV Drinking Water Treatment Emerging Technologies

  2. NSF/ANSI Standard 55 • Evaluation of Microbiological Reduction Performance Capability • Low PressureuV Lamps • 254nm Wavelength • Performance Equated to Delivered Dose • Class A 40 mJ/cm2 With Sensor Technology – Unknown Water Supply • Class B 16 mJ/cm2 Without Sensing Technology – Known Water Supply • Test Organisms • Bacteriophage MS2 – Class A • S. cerevisiae/Bacteriophage T1 – Class B

  3. How does UV inactivate micro-organisms? Well Accepted Mechanism of UV Inactivation 253.7nm UVC Absorbance of DNA At a wavelength of 254nm, UV will break the molecular bonds within micro-organismal DNA, producing thymine dimers and thereby destroying them or prohibiting growth and reproduction

  4. Emerging Technologies • Alternate uV Technologies Are Under Active Development • LED • DBD • Excimer • MP CFL • Halogen • uV Emissions May Be Monochromatic or Polychromatic at Wavelengths Other Than 254 nm

  5. Market Trends

  6. The Issue (Opportunity) • Standard 55 Performance Based Upon Dose….. • Dose Equated to Anticipated Log Reduction at 254 nm Wavelength • Relationship of Dose to Log Reduction Based Upon Established Research and Scientific Findings • The Question (s) • Does the Dose/Log Reduction Relationship Hold For Alternate Technologies Emitting as Wavelength (s) Other than 254 nm? • Is There a Need for the Development of Alternative Measuring Tools? • Can These Alternate Technologies Be Built Into Standard 55?

  7. Summary of Previous Wavelength Works

  8. Motion • The motion is that the uV Task Group be requested to evaluate the available research associated with alternate uV technologies related to the germicidal treatment of water and report back to the Joint Committee their findings and recommendations for accommodating these technologies within the NSF/ANSI standards framework.

  9. How Emerging Technologies Inactivate • How UV inactivates • 254nm comparison to other wavelengths • MS2 Surrogate potential • E Coli • S Typhimurium LT2 • Bacillus Subtilis Spores

  10. How does 253.7nm compare to other wavelength? Linden et al., Water Sci. & Technol., 2001 Mamane-Gravetzet al., Environ. Sci. & Technol., 2005 Beck et al., Environ. Sci. & Technol., 2014 Linden et al., Appl. Environ. Microbiol., 2007

  11. How does MS2/254nm Inactivation compare to bacteria / waterborne pathogens? Bowkeret al., Water Research., 2011 Ren Zhuo Chen et al., Water Research., 2009

  12. How does MS2/254nm Inactivation compare to bacteria / waterborne pathogens? Ren Zhuo Chen et al., Water Research., 2009 Mamane-Gravetzet al., Envirron. Sci. Technology., 2005

  13. Testing Protocol Opportunities • Revision to NSF/ANSI Standard 55 • MS2 as surrogate • Development of new NSF Certification • Alternative Surrogate

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