Comparison of ultraviolet light-emitting diodes and low-pressure mercury-arc lamps for disinfection of water

Environmental Technology
Kari A SholtesLisa M Casanova

Abstract

Ultraviolet (UV) light-emitting diodes (LEDs) emitting at 260 nm were evaluated to determine the inactivation kinetics of bacteria, viruses, and spores compared to low-pressure (LP) UV irradiation. Test microbes were Escherichia coli B, a non-enveloped virus (MS-2), and a bacterial spore (Bacillus atrophaeus). For LP UV, 4-log10 reduction doses were: E. coli B, 6.5 mJ/cm(2); MS-2, 59.3 mJ/cm(2); and B. atrophaeus, 30.0 mJ/cm(2). For UV LEDs, the 4-log10 reduction doses were E. coli B, 6.2 mJ/cm(2); MS-2, 58 mJ/cm(2); and B. atrophaeus, 18.7 mJ/cm(2). Microbial inactivation kinetics of the two UV technologies were not significantly different for E. coli B and MS-2, but were different for B. atrophaeus spores. UV LEDs at 260 nm are at least as effective for inactivating microbes in water as conventional LP UV sources and should undergo further development in treatment systems to disinfect drinking water.

References

Jun 1, 1985·Applied and Environmental Microbiology·J C ChangJ D Johnson
Jan 7, 2003·Applied and Environmental Microbiology·Jeanette A Thurston-EnriquezCharles P Gerba
Jan 9, 2007·Applied and Environmental Microbiology·Janneke G E WijmanTjakko Abee
Apr 9, 2010·Journal of Water and Health·Christie Chatterley, Karl Linden
Jan 12, 2011·Water Research·Colleen BowkerJoel Ducoste

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Citations

Oct 7, 2020·Journal of Photochemistry and Photobiology. B, Biology·Yoram GerchmanMichal Mandelboim

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