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Ultraviolet (UV) Disinfection

Ultraviolet (UV) Disinfection. Ultraviolet Spectrum. UV Radiation Induces Pyrimidine Dimers Disrupts DNA Replication. Pyrimidine Bases = Thymine & Cytosine. UV Radiation Induces Pyrimidine Dimers Disrupts DNA Replication. UV Lamps. UV Lamp Types. Low Pressure Hg Vapor (Amalgam)

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Ultraviolet (UV) Disinfection

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  1. Ultraviolet (UV) Disinfection

  2. Ultraviolet Spectrum

  3. UV Radiation Induces PyrimidineDimersDisrupts DNA Replication Pyrimidine Bases = Thymine & Cytosine

  4. UV Radiation Induces PyrimidineDimersDisrupts DNA Replication

  5. UV Lamps

  6. UV Lamp Types • Low Pressure Hg Vapor (Amalgam) • Higher biocide efficiency • Lower power, lower temperature • Longer lamp life • Lots of lamps needed for large flows • Hence mostly in smaller plants

  7. UV Lamp Types • Medium Pressure Hg Vapor • Broader UV spectrum • Penetrate water better • Higher power use per tube, higher temp • Hotter tubes tend to foul more easily • Fewer tubes needed • Hence more efficient per watt for large flows

  8. Comparative Spectra: Low and Medium Pressure UV Lamps Wavelength, nm

  9. UV Disinfection Equipment

  10. Marine Park WWTP, Vancouver WA

  11. Aesthetics at Marine Park WWTP

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