Numerical Modeling of Flow and Disinfection in UV Disinfection Channels
Publication: Journal of Environmental Engineering
Volume 125, Issue 1
Abstract
The steady two-dimensional turbulent flow in the central region of an open channel in which vertical ultraviolet lamps are arranged in a staggered configuration is predicted using a computational fluid dynamics code incorporating a turbulence model and a boundary-fitted grid. A two-dimensional continuum model of the fate and transport of microorganisms, based on the results of flow simulations and incorporating the series-event model of disinfection kinetics also is presented. From an analysis of the governing transport equation, a dimensionless disinfection parameter that may be useful in discussions of comparative disinfection performance is identified. Model predictions are compared with measurements of flow in the laboratory and measurements of disinfection efficacy in a prototype channel. Good agreement is found between flow predictions and measurements in the flow region upstream of a model lamp/tube, but in the wake region, the measured flow exhibited greater uniformity than the numerical model. Predictions of disinfection process performance are satisfactory at high throughput rates but deteriorate at low throughput rates. Differences in predictions caused by differences in the order of the series-event model were studied and were small when the degree of disinfection was low, but became more important at greater disinfection extents.
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References
1.
Adams, E. W., and Rodi, W. (1990). “Modeling flow and mixing in sedimentation tanks.”J. Hydr. Engrg., ASCE, 116(7), 895–913.
2.
Baas, M., van Esch, R. L. M., and Krüs, H. W. ( 1996). “Latest advances in UV disinfection hydrodynamic simulation and its relation to practical experiences.” Regional Conf. on Ozone, Ultraviolet light, and Advanced Oxidation Processes in Water Treatment, Amsterdam.
3.
Blatchley, E. R. III. ( 1997). “Numerical modelling of UV intensity: Application to collimated beam reactors and continuous flow systems.” Water Res., 31(9), 2205–2218.
4.
Blatchley, E. R. III, and Scheible, O. K. ( 1996). Ultraviolet Disinfection, Chap. 7 in Wastewater Disinfection: Manual of Practice FD-10, Water Environment Federation, Alexandria, Va. Chiu, K. P. (1988). “Hydrodynamic behavior of vertical open-channel UV systems,” PhD dissertation, School of Civil Engineering, Purdue University, West Lafayette, Ind.
5.
Chiu, K., Lyn, D. A., Savoye, P., and Blatchley, E. R. III. (1999). “Integrated UV disinfection model based on particle tracking.”J. Envir. Engrg., ASCE, 125(1), 7–16.
6.
Do-Quang, Z., Djebbar, R., Blatchley, E. R. III, and Lainé, J.-M. ( 1997). “Computational fluid dynamics (CFD) modelling of UV disinfection reactor performances; optimization of the flow in vertical lamps open channel.” Proc., CSCE/ASCE Envir. Engrg. Conf., CSCE, Montreal, 1201–1212.
7.
Imam, E., McCorquodale J. A., and Bewtra, J. K. (1983). “Numerical modeling of sedimentation tanks.”J. Hydr. Engrg., ASCE, 109(12), 1740–1754.
8.
Lyn, D. A. ( 1996). “Numerical modelling of flows in ultraviolet disinfection channels.” North Am. Water and Envir. Congr., ASCE, New York, 3005–3009.
9.
Lyn, D. A., Stamou, A. I., and Rodi, W. (1992). “Density currents and shear-induced flocculation in sedimentation tanks.”J. Hydr. Engrg., ASCE, 118(6), 849–867.
10.
Patankar, S. V. ( 1980). Numerical heat transfer and fluid flow. McGraw-Hill, New York.
11.
Rodi, W. ( 1993). Turbulence models and their application in hydraulics, 3rd Ed., Balkema, Rotterdam, The Netherlands.
12.
Scheible, O. K. ( 1987). “Development of a rationally based design protocol for the ultraviolet light disinfection process.” J. Water Pollution Control Fed., 59(1), 25–31.
13.
Severin, B. F., Suidan, M. F., and Engelbrecht, R. S. ( 1983). “Kinetic modeling of U.V. disinfection of water.” Water Res., 17(11), 1669–1678.
14.
Stambolieva, Z., Roustan, M., Wable, O., Duguet, J. P., and Mallevialle, J. ( 1993). “Methods for design of chlorine contactors for drinking water treatment. Kinetic and hydraulic considerations for disinfection efficiency estimation.” Proc., Am. Water Works Assn. Conf., American Water Works Association, Denver.
15.
Wilcox, D. C. ( 1993). Turbulence modeling for CFD . DCW Industries, La , Calif.
16.
Zhou, S. P., McCorquodale J. A., and Godo, A. M. (1994). “Short-circuiting and density interface in primary clarifiers.”J. Hydr. Engrg., ASCE, 120(9), 1060–1080.
Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 125 • Issue 1 • January 1999
Pages: 17 - 26
History
Received: Mar 4, 1998
Published online: Jan 1, 1999
Published in print: Jan 1999
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