ultraviolet (uv) disinfection. ultraviolet spectrum

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Ultraviolet (UV) Disinfection

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Page 1: Ultraviolet (UV) Disinfection. Ultraviolet Spectrum

Ultraviolet (UV) Disinfection

Page 2: Ultraviolet (UV) Disinfection. Ultraviolet Spectrum

Ultraviolet Spectrum

Page 3: Ultraviolet (UV) Disinfection. Ultraviolet Spectrum

UV Radiation Induces Pyrimidine DimersDisrupts DNA Replication

Pyrimidine Bases =Thymine & Cytosine

Page 4: Ultraviolet (UV) Disinfection. Ultraviolet Spectrum

UV Radiation Induces Pyrimidine DimersDisrupts DNA Replication

Page 5: Ultraviolet (UV) Disinfection. Ultraviolet Spectrum

UV Lamps

Page 6: Ultraviolet (UV) Disinfection. Ultraviolet Spectrum

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

Page 7: Ultraviolet (UV) Disinfection. Ultraviolet Spectrum

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

Page 8: Ultraviolet (UV) Disinfection. Ultraviolet Spectrum

Comparative Spectra: Low and Medium Pressure UV Lamps

Wavelength, nm

Page 9: Ultraviolet (UV) Disinfection. Ultraviolet Spectrum

UV Disinfection Equipment

Page 10: Ultraviolet (UV) Disinfection. Ultraviolet Spectrum

Marine Park WWTP, Vancouver WA

Page 11: Ultraviolet (UV) Disinfection. Ultraviolet Spectrum
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Page 13: Ultraviolet (UV) Disinfection. Ultraviolet Spectrum
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Aesthetics at Marine Park WWTP

Page 15: Ultraviolet (UV) Disinfection. Ultraviolet Spectrum