Repository of Research and Investigative Information

Repository of Research and Investigative Information

Ilam University of Medical Sciences

Ultraviolet irradiation: An effective inactivation method of Aspergillus spp. in water for the control of waterborne nosocomial aspergillosis

Wed Jul 24 16:36:16 2024

(2012) Ultraviolet irradiation: An effective inactivation method of Aspergillus spp. in water for the control of waterborne nosocomial aspergillosis. Water Research. pp. 5935-5940. ISSN 0043-1354

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Invasive aspergillosis is the second most common cause of nosocomial fungal infections and occurring mainly by Aspergillus fumigatus, Aspergillus flavus, and Aspergillus niger. There is evidence that nosocomial aspergillosis may be waterborne. This study was conducted to evaluate the ultraviolet (UV) irradiation efficiency in terms of inactivating the most important Aspergillus species in water since these are potential sources for nosocomial aspergillosis. A continuous flow UV reactor which could be used as a point-of-use (POU) system was used to survey Aspergillus inactivation by UV irradiation. The inactivation efficiency of UV fluence (4.15-25 mJ/cm(2)) was measured by determination of fungal density in water before and after radiation. Because turbidity and iron concentration are two major water quality factors impacting UV disinfection effectiveness, the potential influence of these factors on UV inactivation of Aspergillus spp. was also measured. The 4 log inactivation for A. fumigatus, A. niger and A. flavus at a density of 1000 cfu/ml was achieved at UV fluences of 12.45 mJ/cm(2), 16.6 mJ/cm(2) and 20.75 mJ/cm2, respectively. The inactivation efficiency for lower density (100 cfu/ml) was the same as for the higher density except for A. flavus. The removal efficiency of Aspergillus spp. was decreased by increasing the turbidity and iron concentration. UV disinfection could effectively inactivate Aspergillus spores from water and eliminate potential exposure of high-risk patients to fungal aerosols by installation of POU UV systems. (c) 2012 Elsevier Ltd. All rights reserved.

Item Type: Article
Keywords: Water UV irradiation Aspergillus spp. Nosocomial aspergillosis point-of-use hospital water invasive aspergillosis drinking-water potable water disinfection legionella infection bacteria system Engineering Environmental Sciences & Ecology Water Resources
Page Range: pp. 5935-5940
Journal or Publication Title: Water Research
Journal Index: ISI
Volume: 46
Number: 18
Identification Number:
ISSN: 0043-1354
Depositing User: مهندس مهدی شریفی

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