Theoretical Evaluation of UV Reactors in Series
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VIEW THE REPLYPublication: Journal of Environmental Engineering
Volume 141, Issue 10
Abstract
A theoretical analysis is provided of the extent to which doses from ultraviolet (UV) reactors in series are additive. It is shown that UV reactors’ reduction equivalent dose (RED) depends on the sensitivity of the microbe, the limits of which are the minimum and average of the dose distribution for infinitely sensitive and infinitely resistant microbes. For complete interbank mixing between two reactors in series, the additivity of RED is preserved. For systems where there is a negative correlation between dose paths, the RED is greater than or equal to twice that of a single reactor. The converse occurs for positive correlation. It is proven that when a single reactor is validated with a microbe whose sensitivity is at least twice that of the target microbe, it is assured that two identical UV reactors in series will deliver a RED at least two times that of the single reactor.
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References
Blatchley, E., III., et al. (2006). “Dyed microspheres for quantification of UV dose distributions: Photochemical reactor characterization by Lagrangian actinometry.” J. Environ. Eng., 1390–1403.
Blatchley, E. R., III., et al. (2008). “Validation of large-scale, monochromatic UV disinfection systems for drinking water using dyed microspheres.” Water Res., 42(3), 677–688.
Chen, J., Deng, B., and Kim, C. N. (2011). “Computational fluid dynamics (CFD) modeling of UV disinfection in a closed-conduit reactor.” Chem. Eng. Sci., 66(21), 4983–4990.
Ducoste, J., Liu, D., and Linden, K. (2005). “Alternative approaches to modeling fluence distribution and microbial inactivation in ultraviolet reactors: Lagrangian versus Eulerian.” J. Environ. Eng., 1393–1403.
Ducoste, J. J., and Alpert, S. (2011). “Assessing the UV dose delivered from two UV reactors in series: Can you always assume doubling the UV dose from individual reactor validations?” Proc., 2nd North American Conf. on Ozone, Ultraviolet & Advanced Oxidation Technologies, Toronto.
Ferran, B., Scheible, O. K., Chengyue, S., Kelly, R. F., and Jin, S. (2007). “Biodosimetry of a full scale UV disinfection system to achieve regulatory approval for wastewater reuse.” Proc., Disinfection 2007, Water Environment Federation, Alexandria, VA.
Gandhi, V. N., Roberts, P. J. W., and Kim, J. H. (2012). “Visualizing and quantifying dose distribution in a UV reactor using three-dimensional laser-induced fluorescence.” Environ. Sci. Technol., 46(24), 13220–13226.
Liu, D., Wu, C., Linden, K., and Ducoste, J. (2007). “Numerical simulation of UV disinfection reactors: Evaluation of alternative turbulence models.” Appl. Math. Model., 31(9), 1753–1769.
Lyn, D. A., and Blatchley, E. R., III. (2005). “Numerical computational fluid dynamics-based models of ultraviolet disinfection channels.” J. Environ. Eng., 838–849.
Lyn, D. A., Chiu, K., and Blatchley, E. R., III. (1999). “Numerical modeling of flow and disinfection in UV disinfection channels.” J. Environ. Eng., 17–26.
MOE (Ontario Ministry of Environment). (2006). “Procedure for disinfection of drinking water in Ontario”.
NSF (National Sanitation Foundation). (2002). “Ultraviolet microbiological water treatment systems,” NSF 55-2002, NSF International, Ann Arbor, MI.
NWRI (National Water Research Institute). (2012). Ultraviolet disinfection: Guidelines for drinking water and water reuse, 3rd Ed., National Water Research Institute and Water Research Foundation, Fountain Valley, CA.
Saha, R. K. (2013). “Numerical simulation of an open channel ultraviolet waste-water disinfection reactor.” Master’s thesis, Univ. of Western Ontario, London, ON.
Sozzi, D. A., and Taghipour, F. (2006). “UV reactor performance modeling by Eulerian and Lagrangian methods.” Environ. Sci. Technol., 40(5), 1609–1615.
Tang, C. C., Kuo, J., Huitric, S., Jalali, Y., Horvath, R. W., and Stahl, J. F. (2006). “UV systems for reclaimed water disinfection from equipment validation to operation.” Proc., Water Environment Federation Technology Conf., Dallas, TX.
USEPA (U.S. Environmental Agency). (2006a). Ultraviolet disinfection guidance manual for the final long term 2 enhanced surface water treatment rule. Washington, DC.
USEPA (U.S. Environmental Protection Agency). (2006b). “Surface water treatment rule.”, U.S. Government Printing Office, Washington, DC.
Wols, B. A., Shao, L., Uijttewaal, W. S. J., Hofman, J. A. M. H., Rietveld, L. C., and van Dijk, J. C. (2010a). “Evaluation of experimental techniques to validate numerical computations of the hydraulics inside a UV benchscale reactor.” Chem. Eng. Sci., 65(15), 4491–4502.
Wols, B. A., Uijttewaal, W. S. J., Hofman, J. A. M. H., Rietveld, L. C., and van Dijk, J. C. (2010b). “The weaknesses of a k–e model compared to a large-eddy simulation for the prediction of UV dose distributions and disinfection.” Chem. Eng. J., 162(2), 528–536.
Wright, H. B., and Lawryshyn, Y. (2000). “An assessment of the bioassay concept for UV reactor validation.” Proc., Disinfection 2000, Water Environment Federation, New Orleans.
Xu, C., Zhao, X. S., and Rangaiah, G. P. (2013). “Performance analysis of ultraviolet water disinfection reactors using computational fluid dynamics simulation.” Chem. Eng. J., 221(4), 398–406.
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© 2015 American Society of Civil Engineers.
History
Received: Jan 23, 2013
Accepted: Nov 12, 2014
Published online: Mar 18, 2015
Discussion open until: Aug 18, 2015
Published in print: Oct 1, 2015
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