Verification of Full-Scale Ozone Contactor Inactivation Performance Using Biodosimetry
Publication: Journal of Environmental Engineering
Volume 134, Issue 4
Abstract
A biodosimetric technique was used to verify the concentration-contact time (CT) values [ , CT integrated disinfection design framework (CT-IDDF), CT segregated flow analysis (CT-SFA)] of the ozone contactors of the DesBaillets water treatment plant (Montreal), using indigenous aerobic spore formers (ASFs) as indicators of disinfection efficiency. ASF measurement in ozonated water was performed using a large water sample concentration method. Four assays, completed over a period, involved the implementation of biodosimetric calibration curves using an ozone pilot apparatus and followed by full-scale verifications. ASF inactivation kinetics were well described by a simple Chick–Watson model. The most accurate data also indicated that the underestimates the effective CT (by 1.2–1.9-fold), whereas the CT-IDDF and CT-SFA overestimate it (by 1.0–1.7-fold and 0.9–1.5-fold, respectively). Underestimation from was more pronounced with increased ozone dose while overestimation from CT-IDDF and CT-SFA is most likely due to the difficulty in obtaining a representative ozone residual profile within the contactor. The use of segregated flow analysis provided the best estimate of disinfection performance. Biodosimetry is useful in measuring the effective CT transferred, in verifying model predictions, and in determining the influence of water quality on microbial inactivation.
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Acknowledgments
The writers would like to acknowledge the work of Jacinthe Mailly, Mélanie Rivard, Julie Philibert, Annie Carrière, and Yves Fontaine at the NSERC Chair on Drinking Water for their support in the laboratory work. They would also like to thank the staff of the DesBaillets WTP. The project was funded by the NSERCNRC Industrial Chair on Drinking Water and the Canadian Water Network.
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Published In
Journal of Environmental Engineering
Volume 134 • Issue 4 • April 2008
Pages: 304 - 315
Copyright
© 2008 ASCE.
History
Received: Apr 14, 2006
Accepted: Aug 27, 2007
Published online: Apr 1, 2008
Published in print: Apr 2008
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