Volume 6, Issue 5 (3-2011)
J Health Syst Res 2011, 6(5): 0-0 |
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Mesdaghinia A, Vaezi F, Dehghanifard E, Mahvi A H, Naddafi K, Alimohammadi M et al . Investigating the Feasibility of Water Disinfection Efficiency Improvement in Non-contact UV Radiation. J Health Syst Res 2011; 6 (5)
URL: http://hsr.mui.ac.ir/article-1-197-en.html
URL: http://hsr.mui.ac.ir/article-1-197-en.html
Ali-Reza Mesdaghinia 
1, Forough Vaezi2 , Emad Dehghanifard3 , Amir Hossein Mahvi4 , Kazem Naddafi2 , Mahmood Alimohammadi4 , Reza Ghanbari5
1, Forough Vaezi2 , Emad Dehghanifard3 , Amir Hossein Mahvi4 , Kazem Naddafi2 , Mahmood Alimohammadi4 , Reza Ghanbari5
1- Professor, Department of Environmental Health Engineering, School of Health, Tehran University of Medical Sciences, Tehran, Iran
2- Associate Professor, Department of Environmental Health Engineering, School of Health, Tehran University of Medical Sciences, Tehran, Iran
3- Department of Environmental Health Engineering, School of Health, Tehran University of Medical Sciences, Tehran, Iran
4- Assistant Professor, Department of Environmental Health Engineering, School of Health, Tehran University of Medical Sciences, Tehran, Iran
5- PhD Student, Environment Research Center, Isfahan University of Medical Sciences and Department of Environmental Health Engineering, School of Health, Qazvin University of Medical Sciences, Qazvin, Iran
2- Associate Professor, Department of Environmental Health Engineering, School of Health, Tehran University of Medical Sciences, Tehran, Iran
3- Department of Environmental Health Engineering, School of Health, Tehran University of Medical Sciences, Tehran, Iran
4- Assistant Professor, Department of Environmental Health Engineering, School of Health, Tehran University of Medical Sciences, Tehran, Iran
5- PhD Student, Environment Research Center, Isfahan University of Medical Sciences and Department of Environmental Health Engineering, School of Health, Qazvin University of Medical Sciences, Qazvin, Iran
Abstract: (1086 Views)
Background: Despite their simplicity and the low-cost, the conventional non-contact UV systems have low efficiency in water disinfection. The purpose of this study was to examine the possibility of upgrading these systems by some modifications in order to maximize the water contact with the UV radiation and as a result a better disinfection. Methods: In this study, two enhanced models of non-contact UV systems were compared to the conventional model. The waterfall model was made with a design based on flowing water from two thin waterfalls around a UV lamp in order to have direct radiation from the lamp’s all exposure areas. Also, the stair type model was designed in which a lamp was fixed over the shiny steel steps. The results of water disinfection in two flow rates of 0.2 and 0.4 L/s were compared with traditional design at the exact similar conditions. The disinfection efficiency of this study was measured by reduction of fecal choliforms in water which were evaluated in turbidities of 0.5, 10 and 20 NTU. Findings: The disinfection efficiency of the waterfall model in the turbidity of 0.5 NTU was specified to be 3.65 log in reduction of fecal choliforms compared to the conventional model by 2.93 log reduction (P<0.05). Besides, this new model was quite capable of disinfecting the water with high turbidities up to 20 NTU. However, the stair type model had less efficiency than the conventional model. Conclusion: The reduction in disinfection efficiency at higher flow rates and turbidities for the waterfall model was much less than conventional model. So, application of the waterfall model in larger scales and for small water treatment facilities is suggested.
Keywords: Ultraviolet Radiation, Water Disinfection, Non-contact UV System, Waterfall Model, Stair Type Model. &, nbsp
Type of Study: Research |
Subject:
education health and promotion
Received: 2020/07/16 | Accepted: 2011/03/15 | Published: 2011/03/15
Received: 2020/07/16 | Accepted: 2011/03/15 | Published: 2011/03/15
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