Hydraulic Calibration and Fluence Determination of Model Ultraviolet Disinfection System
Publication: Journal of Environmental Engineering
Volume 128, Issue 11
Abstract
The objective of this project was to determine the impact hydraulic dispersion has on the calibration of a flow-though model ultraviolet (UV)-disinfection system with chemical actinometry (potassium ferrioxalate) and MS 2 bacteriophage. Fluence was supplied by a medium-pressure ultraviolet lamp to a quartz tube (19 mm diameter) situated in a ventilated galvanized casing. The UV lamp was attached to a vertical position guide, for UV fluence to be varied by positioning the UV lamp at various vertical heights above the quartz tube. Water was pumped through the quartz tube at rates of 100–300 mL/min. An in-line pipe mixer was installed prior to the UV system to ensure adequate mixing with the bulk liquid and chemical actinometer and to mitigate jet formation within the quartz tube. Tracer studies were conducted with and without the in-line mixer using potassium chloride (3 mM). Dispersion coefficients were obtained from the tracer study and incorporated into an axial-dispersion model to determine the rate coefficient of potassium ferrioxalate in the model UV system. A numerical model was used to determine the fluence supplied by the lamp with a reduction in exposure time. After dispersion and kinetics are accounted for within the UV system, the model predicted UV fluence that was in general agreement with UV design curves for inactivation MS 2 bacteriophage. The differences in the design curves and the fluence–response model in the present investigation were found to be related to the experimental errors introduced from using a flowing system and because a medium pressure lamp was used in the present investigation.
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References
Bailey, J. E., and Ollis, D. F. (1986). Biochemical engineering fundamentals, 2nd Ed., McGraw–Hill, New York.
Battigelli, D. A., Sobsey, M. D., and Lobe, D. C.(1993). “The inactivation of hepatitis A virus and other model viruses by UV irradiation.” Water Sci. Technol., 27(3–4), 339–342.
Blatchley, E. R., et al. (2000). Ultraviolet disinfection: Guidelines for drinking water and water reuse, NWRI and AwwaRF, Fountain Valley, Calif.
Bukhari, Z., Hargy, T. M., Bolton, J. R., Dussert, B., and Clancy, J. L.(1999). “Medium-pressure UV for oocyst inactivation.” J. AWWA, 91(3), 86–94.
Cotton, C. A., Owen, D. M., Cline, G. C., and Brodeur, T. P.(2001). “UV disinfection costs for inactivating Cryptosporidium.” J. AWWA, 93(6), 82–94.
Craik, S. A., Finch, G. R., Bolton, J. R., and Belosevic, M.(2000). “Inactivation of Giardia muris cysts using medium pressure ultraviolet radiation in filtered drinking water.” Water Res., 34(18), 4325–4332.
Craik, S. A., Weldon, D., Finch, G. R., Bolton, J. R., and Belosevic, M.(2001). “Inactivation of Cryptosporidium parvum oocysts using medium- and low-pressure ultraviolet radiation.” Water Res., 35(6), 1387–1398.
Craun, G. F., Hubbs, S. A., Frost, F., Calderon, R. L., and Via, S. H.(1998). “Waterborne outbreaks of cryptosporidiosis.” J. AWWA, 90(9), 81–91.
Harris, G. D., Adams, D., Moore, W. M., and Sorrensen, D. L.(1987). “Potassium Ferrioxalate as Chemical Actinometer in Ultraviolet Reactors.” J. Environ. Eng. Div. (Am. Soc. Civ. Eng.), 113(3), 612–627.
Havelaar, A. H., Meulemans, C. C. E., Pot-Hogeboom, W. M., and Koster, J.(1990), “Inactivation of bacteriophage MS2 in wastewater effluent with monochromatic and polychromatic ultraviolet light.” Water Res., 24(11), 1387–1393.
International Organization for Standardization (ISO). (1995). “Water quality—detection and enumeration of F-specific RNA bacteriophages, 1, Method by incubation with a host strain.” Rep. No. ISO 10705-1, Geneva.
Jagger, J. H. (1967). Introduction to research in UV photobiology, Prentice–Hall, Englewood Cliffs, N.J.
Levenspiel, O. (1999). Chemical reaction engineering, 3rd Ed., Wiley, New York.
Linden, K. G., and Mofidi, A. A. (1999). “Measurement of UV irradiance: Tools and considerations.” Proc. AWWA Water Quality and Technology Conf., Tampa, Fla.
Lyn, D. A., Chiu, K., and Blatchley, E. R., III. (1999). “Numerical modeling of flow and disinfection in UV disinfection channels.” J. Environ. Eng. Div. (Am. Soc. Civ. Eng.), 125(1), 17–26.
Mofidi, A. A., Baribeau, H., Rochelle, P. A., De Leon, R., Coffey, B. M., and Green, J. F.(2001). “Disinfection of Cryptosporidium with polychromatic UV light.” J. AWWA, 93(6), 95–109.
Qualls, R. G., Flynn, M. P., and Johnson, J. D.(1983). “The role of suspended particles in ultraviolet disinfection.” J. Water Pollut. Control Fed., 55(10), 1280–1285.
Shaw, J. P., Malley, J. P., Jr., and Willoughby, S. A.(2000). “Effects of UV irradiation on organic matter.” J. AWWA, 92(4), 157–167.
Weber, W. J., Jr., and DiGiano, F. A. (1995). Process dynamics in environmental systems, Wiley, New York.
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Copyright © 2002 American Society of Civil Engineers.
History
Received: Aug 28, 2001
Accepted: Mar 19, 2002
Published online: Oct 15, 2002
Published in print: Nov 2002
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