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Investigation of Low-Pressure Ultraviolet Radiation on Inactivation of Rhabitidae Nematode from Water

BACKGROUND: Rhabditidae is a family of free-living nematodes. Free living nematodes due to their active movement and resistance to chlorination, do not remove in conventional water treatment processes thus can be entered to distribution systems and cause adverse health effects. Ultraviolet radiation...

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Autores principales: DEHGHANI, Mohammad Hadi, JAHED, Gholam-Reza, ZAREI, Ahmad
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Tehran University of Medical Sciences 2013
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3633802/
https://www.ncbi.nlm.nih.gov/pubmed/23641409
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author DEHGHANI, Mohammad Hadi
JAHED, Gholam-Reza
ZAREI, Ahmad
author_facet DEHGHANI, Mohammad Hadi
JAHED, Gholam-Reza
ZAREI, Ahmad
author_sort DEHGHANI, Mohammad Hadi
collection PubMed
description BACKGROUND: Rhabditidae is a family of free-living nematodes. Free living nematodes due to their active movement and resistance to chlorination, do not remove in conventional water treatment processes thus can be entered to distribution systems and cause adverse health effects. Ultraviolet radiation (UV) can be used as a method of inactivating for these organisms. This cross sectional study was done to investigate the efficiency of ultraviolet lamp in the inactivation of free living nematode in water. METHODS: The effects of radation time, turbidity, pH and temperature were invistigated in this study. Ultraviolet lamp used in this study was a 11 W lamp and intensity of this lamp was 24 μw / cm(2). RESULTS: Radiation time required to achieve 100% efficiency for larvae nematode and adults was 9 and 10 minutes respectively. There was a significant correlation between the increase in radiation time, temperature rise and turbidity reduction with inactivation efficiency of lamp (P<0.001). Increase of turbidity up 25 NTU decreased inactivation efficiency of larvae and adult nematodes from 100% to 66% and 100% to 64% respectively. Change in pH range from 6 to 9 did not affect the efficiency of inactivation. With increasing temperature inactivation rate increased. Also the effect of the lamp on inactivation of larvae nematod was mor than adults. CONCLUSIONS: It seems that with requiring the favorable conditions low-pressure ultraviolet radiation systems can be used for disinfection of water containing Rhabitidae nematode.
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spelling pubmed-36338022013-05-02 Investigation of Low-Pressure Ultraviolet Radiation on Inactivation of Rhabitidae Nematode from Water DEHGHANI, Mohammad Hadi JAHED, Gholam-Reza ZAREI, Ahmad Iran J Public Health Original Article BACKGROUND: Rhabditidae is a family of free-living nematodes. Free living nematodes due to their active movement and resistance to chlorination, do not remove in conventional water treatment processes thus can be entered to distribution systems and cause adverse health effects. Ultraviolet radiation (UV) can be used as a method of inactivating for these organisms. This cross sectional study was done to investigate the efficiency of ultraviolet lamp in the inactivation of free living nematode in water. METHODS: The effects of radation time, turbidity, pH and temperature were invistigated in this study. Ultraviolet lamp used in this study was a 11 W lamp and intensity of this lamp was 24 μw / cm(2). RESULTS: Radiation time required to achieve 100% efficiency for larvae nematode and adults was 9 and 10 minutes respectively. There was a significant correlation between the increase in radiation time, temperature rise and turbidity reduction with inactivation efficiency of lamp (P<0.001). Increase of turbidity up 25 NTU decreased inactivation efficiency of larvae and adult nematodes from 100% to 66% and 100% to 64% respectively. Change in pH range from 6 to 9 did not affect the efficiency of inactivation. With increasing temperature inactivation rate increased. Also the effect of the lamp on inactivation of larvae nematod was mor than adults. CONCLUSIONS: It seems that with requiring the favorable conditions low-pressure ultraviolet radiation systems can be used for disinfection of water containing Rhabitidae nematode. Tehran University of Medical Sciences 2013-03-01 /pmc/articles/PMC3633802/ /pubmed/23641409 Text en Copyright © Iranian Public Health Association & Tehran University of Medical Sciences http://creativecommons.org/licenses/by-nc/3.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution NonCommercial 3.0 License (CC BY-NC 3.0), which allows users to read, copy, distribute and make derivative works for non-commercial purposes from the material, as long as the author of the original work is cited properly.
spellingShingle Original Article
DEHGHANI, Mohammad Hadi
JAHED, Gholam-Reza
ZAREI, Ahmad
Investigation of Low-Pressure Ultraviolet Radiation on Inactivation of Rhabitidae Nematode from Water
title Investigation of Low-Pressure Ultraviolet Radiation on Inactivation of Rhabitidae Nematode from Water
title_full Investigation of Low-Pressure Ultraviolet Radiation on Inactivation of Rhabitidae Nematode from Water
title_fullStr Investigation of Low-Pressure Ultraviolet Radiation on Inactivation of Rhabitidae Nematode from Water
title_full_unstemmed Investigation of Low-Pressure Ultraviolet Radiation on Inactivation of Rhabitidae Nematode from Water
title_short Investigation of Low-Pressure Ultraviolet Radiation on Inactivation of Rhabitidae Nematode from Water
title_sort investigation of low-pressure ultraviolet radiation on inactivation of rhabitidae nematode from water
topic Original Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3633802/
https://www.ncbi.nlm.nih.gov/pubmed/23641409
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