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

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...

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Vydáno v:Water research (Oxford) Ročník 94; s. 341 - 349
Hlavní autoři: Song, Kai, Mohseni, Madjid, Taghipour, Fariborz
Médium: Journal Article
Jazyk:angličtina
Vydáno: England Elsevier Ltd 01.05.2016
Témata:
Bacteria - radiation effects
Bacteriophages - radiation effects
disinfection
Disinfection - methods
Inactivation effectiveness
industrial applications
lamps
microorganisms
pathogens
standard operating procedures
Ultraviolet light-emitting diode (UV-LED)
Ultraviolet Rays
UV disinfection
Water - chemistry
Water Microbiology
Water Purification - methods
Water treatment
wavelengths
Inactivation effectiveness
Ultraviolet light-emitting diode (UV-LED)
Water treatment
UV disinfection
ISSN:0043-1354, 1879-2448
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Shrnutí: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. [Display omitted] •The recent studies on newly emerging UV-LEDs for water disinfection are reviewed.•The inactivation effectiveness of different UV-LED wavelengths is illustrated.•The effects of UV-LED multiple wavelengths and pulsed illuminations are presented.•Mechanisms of microorganism inactivation by UV-LEDs are discussed.•Future research directions for UV-LED water disinfection are proposed.
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ISSN:0043-1354
1879-2448
DOI:10.1016/j.watres.2016.03.003