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Inactivation of Waterborne Viruses by Ozone in Natural Matrices : Proxies for viral inactivation. Camille Wolf, Annalisa Pavese, Urs von Gunten , Tamar Kohn. Why does this matter ?. Quantitative Microbial Risk Analysis. Wastewater treatment. Guidelines or legislation.
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Inactivation of Waterborne Viruses by Ozone in Natural Matrices : Proxies for viral inactivation Camille Wolf, Annalisa Pavese, Urs von Gunten, Tamar Kohn
Why does this matter ? Quantitative Microbial Risk Analysis Wastewater treatment Guidelines or legislation (Potable) Water Reuse Gerrity (2012) /Andrey Kekyalyaynen/ ELSEVIR/ http://www.greatlakestoday.org
Challenges • Impossible to monitor infective virus • kO3-virus is unknown • Impossible to know exposure Ozone exposure Inactivation Inactivation rate constant
Kinetics in buffer system • Simplified system • Ozone exposure is controlled by chemistry • kO3-Virus Temperature : 2, 12 and 22°C 9 viruses & bacteriophages Natural matrices Bacteriophages Human viruses
Objectives ? Ozonation [Virus]i [Virus]f • Confirm O3 efficiency in natural matrices • Validate potential of proxies MS2 Coxsackievirus B5 Virus specific O3 dose ΔUV254 Carbamazepine Proxies [Proxy]f [Proxy]i d[Proxy] d[Virus] Humic acid Stevenson F.J. (1994). Humus Chemistry: Genesis, Composition, Reactions. New York: John Wiley & Sons.
Methods: Natural matrices https://map.geo.admin.ch
Methods: O3 exposure in natural matrix • Quenched flow Exposure vs specific O3 Dose Dose [gO3/gDOC] R script
Methods: O3 exposure in natural matrix O3 Dose • Inactivation : MPN or Plaques Assay Exposures
Results : kO3-virus kO3-virusBuffer system (Wolf et al., 2018)
Methods : Proxies O3 Dose • Batch experiment • ΔUV254 • Inactivation : Cell culturing methods • CBZ : HPLC Laboratory Precision LimitedMatTek Corporation
Results: Proxies vs O3 specific dose Specific O3 dose, [gO3/gDOC] Specific O3 dose, [gO3/gDOC]
Predicted inactivation during WW treatment CBZ abatement ΔUV254 Data from Lester et al. (2012) extracted using webplotDigitilizer and recomputed
Predicted inactivation during WW treatment ΔUV254Up to 5 log CBZUp to 2.5 log CBZ abatement ΔUV254 Prediction does not include the “Plateau”
Conclusions • Specific O3 dose water specific • ΔUV254 is a good proxy for water with sufficient high [DOC] • CBZ abatement is a good proxy over wider range of [DOC]
References Gerrity, D.; Gamage, S.; Jones, D.; Korshin, G. V.; Lee, Y.; Pisarenko, A.; Trenholm, R. A.; von Gunten, U.; Wert, E. C.; Snyder, S. A. Development of Surrogate Correlation Models to Predict Trace Organic Contaminant Oxidation and Microbial Inactivation during Ozonation. Water Res.2012, 46 (19), 6257–6272. Lester, Y.; Mamane, H.; Zucker, I.; Avisar, D. Treating Wastewater from a Pharmaceutical Formulation Facility by Biological Process and Ozone. Water Res.2013, 47 (13), 4349–4356. Gamage, S.; Gerrity, D.; Pisarenko, A. N.; Wert, E. C.; Snyder, S. A. Evaluation of Process Control Alternatives for the Inactivation of Escherichia Coli, MS2 Bacteriophage, and Bacillus Subtilis Spores during Wastewater Ozonation. Ozone Sci. Eng.2013, 35 (6), 501–513. Lee, Y.; Kovalova, L.; McArdell, C. S.; von Gunten, U. Prediction of Micropollutant Elimination during Ozonation of a Hospital Wastewater Effluent. Water Res.2014, 64, 134–148. Carvajal, G.; Branch, A.; Michel, P.; Sisson, S. A.; Roser, D. J.; Drewes, J. E.; Khan, S. J. Robust Evaluation of Performance Monitoring Options for Ozone Disinfection in Water Recycling Using Bayesian Analysis. Water Res.2017, 124, 605–617. Wolf, C.; von Gunten, U.; Kohn, T. Kinetics of Inactivation of Waterborne Enteric Viruses by Ozone. Environ. Sci. Technol.2018, 52 (4), 2170–2177.