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Frontiers of Engineering Reports on Leading-Edge Engineering from the 2007 Symposium (2008) / Chapter Skim
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Ultraviolet Irradiation: An Age-Old Emerging Technology for Water Treatment--Karl G. Linden
Pages 117-124

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From page 117...
... TRADITIONAL USE OF UV TECHNOLOGIES IN WATER TREATMENT Since the 1970s, there has been a growing understanding that chlorine application for disinfection of water has adverse effects in both natural waters and drinking water. In wastewater, chlorine was used to disinfect the sewage before it was discharged into natural water bodies.
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From page 118...
... Engineered UV systems were first developed at the turn of the 20th century with the mercury arc lamp. Current conventional UV lamps include mercury vapor lamps of the low-pressure (LP)
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From page 119...
... and medium-pressure (MP) mercury vapor lamps, compared with a new surface discharge pulsed-UV source.
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From page 120...
... The UV dose required for 99.99 percent inactivation of various pathogens is displayed in Figure 3. UV disinfection systems are commonly designed around a UV dose of 40 mJ/cm2.
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From page 121...
... because it accelerates the natural oxidation that occurs in the environment. It is a rapidly growing treatment technology and uses either LP or MP UV technologies or other UV sources with emissions overlapping that of H2O2 for destroying a variety of pollutants in water, including taste and odor-causing compounds, endocrine-disrupting compounds, pharmaceuticals, personal care products, and agricultural chemicals.
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From page 122...
... THE FRONTIERS OF UV Although UV itself is an emerging technology on the frontier of water treatment, there are many new engineering and scientific advances that continue to push and improve the technology and help develop a better understanding of the fundamentals of how UV works, leading to improved process design. Advances in UV lamp technologies coupled with concerns about mercury in UV lamps have led to lamp development, including the new pulsed-UV lamps with instanton capabilities and radiation intensities up to 10,000 times greater than LP UV sources.
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From page 123...
... 2007. Enhanced inactivation adenovirus types 2 and 40 under medium pressure and pulsed UV disinfection systems.
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Key Terms

  • water treatment
  • emerging technology
  • mercury vapor
  • advanced oxidation
  • safe water

  • stringent regulations
  • chemical bonds
  • vapor lamps
  • repair processes
  • ultraviolet disinfection

  • chemical destruction
  • oxidation processes
  • absorbance features
  • dna absorbance
  • medium pressure

  • disinfection process
  • water quality
  • water distribution
  • improving water
  • treating water

  • potable water
  • water regulations
  • water disinfection
  • effective water
  • disinfect water

  • water reuse
  • finished water
  • water conditions
  • water reservoirs
  • water using


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