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      Application of ultraviolet light-emitting diodes (UV-LEDs) for water disinfection: A review.

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          Abstract

          Ultraviolet (UV) disinfection is an effective technology for the inactivation of pathogens in water and is of growing interest for industrial application. A new UV source - ultraviolet light-emitting diode (UV-LED) - has emerged in the past decade with a number of advantages compared to traditional UV mercury lamps. This promising alternative raises great interest in the research on application of UV-LEDs for water treatment. Studies on UV-LED water disinfection have increased during the past few years. This article presents a comprehensive review of recent studies on UV-LEDs with various wavelengths for the inactivation of different microorganisms. Many inconsistent and incomparable data were found from published studies, which underscores the importance of establishing a standard protocol for studying UV-LED inactivation of microorganisms. Different UV sensitivities to UV-LEDs and traditional UV lamps were observed in the literature for some microorganisms, which requires further investigation for a better understanding of microorganism response to UV-LEDs. The unique aspects of UV-LEDs improve inactivation effectiveness by applying LED special features, such as multiple wavelengths and pulsed illumination; however, more studies are needed to investigate the influencing factors and mechanisms. The special features of UV-LEDs offer the flexibility of novel reactor designs for a broad application of UV-LED reactors.

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          Author and article information

          Journal
          Water Res.
          Water research
          Elsevier BV
          1879-2448
          0043-1354
          May 01 2016
          : 94
          Affiliations
          [1 ] Department of Chemical and Biological Engineering, The University of British Columbia, 2360 East Mall, Vancouver, BC V6T 1Z3, Canada.
          [2 ] Department of Chemical and Biological Engineering, The University of British Columbia, 2360 East Mall, Vancouver, BC V6T 1Z3, Canada. Electronic address: fariborz.taghipour@ubc.ca.
          Article
          S0043-1354(16)30130-0
          10.1016/j.watres.2016.03.003
          26971809
          29b5fb97-6bac-4d8a-b955-a005d2d0e7fd
          History

          Inactivation effectiveness,UV disinfection,Ultraviolet light-emitting diode (UV-LED),Water treatment

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