Inactivation of Giardia Cysts by Ozone after Residual Disappearance
Publication: Journal of Environmental Engineering
Volume 148, Issue 2
Abstract
Kinetic models for inactivation of microorganisms by chemical disinfectants have described the instantaneous rate of kill as a function of the instantaneous residual. Laboratory batch experiments were conducted exposing cysts of Giardia muris to low doses of dissolved ozone in water from Lake Audubon, ND, and Vancouver, BC. Viability was assessed by excystation. Substantial inactivation was found to continue following disappearance of ozone residual, indicating that the fundamental postulate of modeling chemical disinfection may not be universally applicable. The mechanism for this effect, the extent of applicability, and the alternative modeling frameworks needs further study. However, this finding, if generalizable, has significance particularly in treatment of wastewater for reuse, and may provide a pathway for achieving greater log removals while keeping disinfectant byproducts low.
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Data Availability Statement
Experimental data are available by contacting the corresponding author.
Acknowledgments
Experimental work on the Lake Audubon and Vancouver waters was performed by Shubhanghi Prabhudesai, who was an MS student in environmental engineering at Drexel University. Work on Lake Audubon and Vancouver waters was funded under a project from Montgomery Watson to Drexel University.
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Published In
Journal of Environmental Engineering
Volume 148 • Issue 2 • February 2022
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Jul 12, 2021
Accepted: Oct 20, 2021
Published online: Dec 15, 2021
Published in print: Feb 1, 2022
Discussion open until: May 15, 2022
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