Comparison of UV-C and UV-C LED germicidal efficiency for potable water use
Keywords:
Disinfection, Light emitting diodes (LED), UV light, Water treatmentAbstract
Ultraviolet (UV) irradiation is a common disinfection option for water treatment. UV irradiation inactivates bacteria, viruses, and protozoa, with the benefits of no taste and odor issues, no known disinfection byproducts (DBPs), no danger of overdosing, relatively fast treatment rates compared to sand filtration. Ultraviolet-light-emitting diode (UV LED) contains no mercury, and its compact size and durable design offer excellent portability. The object of this study was to compare the inactivation efficiency of UV-C and UV-C LED for water disinfection. The collimated-beam system was used for this study. For the microorganisms to be tested, E. coli (ATCC 15597), which readily responds to UV light, and Bacillus subtilis sp. (ATCC 6633) were used. E. coli were 3 log inactivation of UV-C and UV-C LED applied fluence of 18 mJ/cm2 at pH 7 and Bacillus subtilis sp. were 2 log inactivation of UV-C and UV-C LED applied fluence of 40 mJ/cm2 at pH 7. UV-C LED disinfection was found to have nearly the same level of UV-C disinfection.References
American Public Health Association (APHA); American Water Works Association (AWWA); Water Environment Federation (WEF), 1998. Standard Methods for the Examination of Water and Wastewater; 20th ed., American Public Health Association, Washington DC.
Bohrerova, Z., Mamane, H., Ducoste, J., Linden, K.G., 2006. Comparative inactivation of Bacillus subtilis spores and MS-2 coliphage in a UV reactor: Implications for validation. J. Environ. Eng. ASCE., 132, 1544-1561.
Bowker, C., Sain, A., Shatalov, M., Ducoste, J., 2011. Microbial UV fluence-response assessment using a novel UV-LED collimated beam system. Water. Res., 45, 2011-2019.
Bowker, C., Sain, A., Shatalov, M., Ducoste, J., 2011. Microbial UV fluence-response assessment using a novel UV-LED collimated beam system. Water. Res., 45, 2011-2019.
Chick, H., 1908. Investigation of the laws of disnfection. J. Hyg., 8, 92.
Cho, M., Kim, J.H., Yoon, J.Y., 2006. Investigating synergism during sequential inactivation of Bacillus subtilis spores with several disinfectants. Water. Res., 40, 2911-2920.
Cho, M., Kim, J.H., Yoon, J.Y., 2006. Investigating synergism during sequential inactivation of Bacillus subtilis spores with several disinfectants. Water. Res., 40, 2911-2920.
Cho, M., Lee, C., Chung, H., Yoon, J., 2004. Sequential inactivation of Bacillus subtilis spores with chlorine dioxide/free chlorine and UV/free chlorine. 2nd Asia Conference Ultraviolet Technologies for Environmental Applications.
Cho, M., Lee, Y., Chung, H., Yoon, J., 2004a. Inactivation of Escherichia coli by photochemical reaction of Ferrioxalate at slightly acidic and near-neutral pHs. Appl. Environ. Microbiol., 70, 1129-1134.
Jung, Y.J., Oh, B.S., Kang, J.W., 2008. Synergistic effect of sequential or combined use of ozone and UV radiation for the disinfection of Bacillus subtilis spores. Water. Res., 42, 1613-1612.
Montgomery, J.M., 1985. Water treatment principles and design. John Wiley and Sons, 275-276.
Nakayama, A., Yano, Y., Kobayashi, S., Ishikawa, M., Sakai, K., 1996. Comparison of pressure resistances of spores of six Bacillus strains with their heat resistances. Appl. Environ. Microbiol., 62, 3897-3900.
Rennecker, J.L., Marias, B.J., Owens, J.H., Rice, E.W., 1999. Inactivation of Cryptosporidium parvum oocysts with ozone. Water. Res., 31(11), 2481-2488.
Shin, G.A., Linden, K.G., Arrowood, M., Sobsey, M.D., 2001. Low pressure UV inactivation and subsequent DNA repair potential of Cryptosporidium parvum. Appl. Environ. Microbiol., 67, 3029-3032.
US EPA, 2003. Ultraviolet Disinfection Guidance Manual, EPA 815-D-03-007, 335-340.
Vilhunen, S., Srkk, H., Sillanp, M., 2009. Ultraviolet light-emitiing diodes in water disinfection. Environ. Sci. Pollut. Res., 16(4), 439-441.
Wang, T., MacGregor, S.J., Anderson, J.G., Woolsey, G.A., 2005. Pulsed ultra-violet inactivation spectrum of Escherichia coli. Water. Res., 39, 2921-2925.
Wrtele, M.A., Kolbe, T., Lipsz, M., Klberg, A., Weyers, M., Kneissl, M., Jekel, M., 2011. Application of GaN-based ultraviolet-C light emitting diodes-UV LEDs-for water disinfection. Water. Res., 45, 1481-1489.
Downloads
Published
How to Cite
Issue
Section
License
Copyright (c) 2020 Sook Hyun Nam, Eun Ju Kim, Tae- Mun Hwang
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
