| Microbial UV fluence-response assessment using a novel UV-LED collimated beam system. | |
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MedLine Citation:
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PMID: 21220143 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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A research study has been performed to determine the ultraviolet (UV) fluence-response of several target non-pathogenic microorganisms to UV light emitting diodes (UV-LEDs) by performing collimated beam tests. UV-LEDs do not contain toxic mercury, offer design flexibility due to their small size, and have a longer operational life than mercury lamps. Comsol Multiphysics was utilized to create an optimal UV-LED collimated beam design based on number and spacing of UV-LEDs and distance of the sample from the light source while minimizing the overall cost. The optimized UV-LED collimated beam apparatus and a low-pressure mercury lamp collimated beam apparatus were used to determine the UV fluence-response of three surrogate microorganisms (Escherichia coli, MS-2, T7) to 255 nm UV-LEDs, 275 nm UV-LEDs, and 254 nm low-pressure mercury lamps. Irradiation by low-pressure mercury lamps produced greater E. coli and MS-2 inactivation than 255 nm and 275 nm UV-LEDs and similar T7 inactivation to irradiation by 275 nm UV-LEDs. The 275 nm UV-LEDs produced more efficient T7 and E. coli inactivation than 255 nm UV-LEDs while both 255 nm and 275 nm UV-LEDs produced comparable microbial inactivation for MS-2. Differences may have been caused by a departure from the time-dose reciprocity law due to microbial repair mechanisms. |
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Authors:
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Colleen Bowker; Amanda Sain; Max Shatalov; Joel Ducoste |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2010-12-13 |
Journal Detail:
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Title: Water research Volume: - ISSN: 1879-2448 ISO Abbreviation: - Publication Date: 2010 Dec |
Date Detail:
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Created Date: 2011-1-11 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0105072 Medline TA: Water Res Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
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Copyright © 2010 Elsevier Ltd. All rights reserved. |
Affiliation:
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Hazen and Sawyer, P.C., 4944 Parkway Plaza Blvd., Suite 375, Charlotte, NC 28217, USA. |
Export Citation:
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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