Inactivation of E. coli Using Flow-Through Ultrasound and Ultraviolet Light Reactors in Series
Publication: Journal of Environmental Engineering
Volume 141, Issue 11
Abstract
Water disinfection processes with sequential arrangements of ultrasound (US) and ultraviolet light (UV) reactors were investigated using Escherichia coli (E. coli) in a solution of 0.9% salinity. Experimental runs were carried out with reactor setups that provided sequential treatments of US followed by UV and UV followed by US. Using a mathematical model developed for three continuously stirred tank reactors in series (3-CSTR), a nonlinear regression analysis was conducted to determine the inactivation rate constants for E. coli and the formation rate constants for hydroxyl radicals. The additive, antagonistic, and synergistic effects of US (frequency 20 kHz, power density ) and UV (irradiance ) were evaluated using kinetic constants and reactor efficiencies. Results showed that the sequential irradiation of US followed by UV yielded a synergistic effect on the inactivation of E. coli and that UV followed by US produced weak synergism.
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Acknowledgments
The authors would like to thank Teri Peterson for her help with the statistical analysis. The draft and final versions of the manuscript were prepared during the visiting scholar program under the auspices of Kyoto University.
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Published In
Journal of Environmental Engineering
Volume 141 • Issue 11 • November 2015
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Jul 12, 2014
Accepted: Mar 27, 2015
Published online: Jun 4, 2015
Published in print: Nov 1, 2015
Discussion open until: Nov 4, 2015
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