Abstract
A ring-shaped disinfection apparatus has been developed containing twenty ultraviolet-light-emitting diodes (UV-LEDs) with emission at 285 nm. The apparatus was applied to Escherichia coli, , MS2, and adenovirus in water. The reduction-equivalent fluence in the apparatus was determined, based on a modification of the protocol for the bench-scale challenge test by low-pressure (LP) UV lamp systems (LPUV). All species demonstrated log-linear inactivation profiles versus the fluence, and the inactivation rate constants for E. coli, , MS2, and adenovirus were 0.157, 0.037, 0.029, and , respectively. The inactivation rate constant for adenovirus under the UV-LED exposure () was higher than that under a LPUV lamp (), and the ratio of to , which is approximated as a germicidal factor at 285 nm, was 1.15 for adenovirus. To conclude, this study demonstrated a high potential of the 285 nm UV-LEDs to inactivate microorganisms in water. The germicidal factor found for adenovirus implies that the 285 nm UV-LED could be a good option to inactivate adenovirus in water.
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Acknowledgments
This study was supported by the Japan Society for the Promotion of Science (JSPS) as the Grants-in-Aid for Scientific Research 26289181, and by the Japan Science and Technology Agency (JST) as the Japan-Canada Research Cooperative Program within the framework of the Strategic International Collaborative Research Program (SICORP). Dr. Bolton was a JSPS fellow to conduct a part of this study at the University of Tokyo. The Kurita Water and Environment Foundation also supported this study.
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Information & Authors
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Published In
Journal of Environmental Engineering
Volume 142 • Issue 3 • March 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Apr 27, 2015
Accepted: Sep 30, 2015
Published online: Nov 18, 2015
Published in print: Mar 1, 2016
Discussion open until: Apr 18, 2016
ASCE Technical Topics:
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