Pulsed ultra-violet inactivation spectrum of Escherichia coli

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Inactivation of Escherichia coli is examined using ultra-violet (UV) radiation from a pulsed xenon flashlamp. The light from the discharge has a broadband emission spectrum extending from the UV to the infrared region with a rich UV content. The flashlamp provides high-energy UV output using a small number of short-duration pulses (30 μs). The flashlamp is used with a monochromator to investigate the wavelength sensitivity of E. coli to inactivation by the pulsed UV light. Using 8 nm wide pulses of UV radiation, the most efficient inactivation is found to occur at around 270 nm and no inactivation is observed above 300 nm. A pyroelectric detector allows the energy dose to be determined at each wavelength, and a peak value for E. coli population reduction of 0.43 log per mJ/cm2 is measured at 270 nm. The results are compared with the published data available for continuous UV light sources.
Original languageEnglish
Pages (from-to)2921-2925
Number of pages4
JournalWater Research
Issue number13
Publication statusPublished - 2005


  • UV inactivation
  • escherichia coli
  • e coli
  • disinfection
  • microorganism
  • flashlamp
  • water

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