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Gaseous Ozone Distribution Within a Forced Air Ozone Reactor for Bulk Produce Decontamination

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dc.contributor.advisor Lubitz, William David Arevalo Camargo, Juanita del Mar 2019-05-06T19:19:16Z 2020-04-16T05:00:53Z 2019-03 2019-04-16 2019-05-06
dc.description.abstract Recalls of fresh produce due to possible bacterial contamination are increasing. Commonly used disinfection methods such as washing in chlorinated water can impact food quality and often have limited effectiveness. Recently, an Ontario food-processing company has designed and built a fresh produce decontamination treatment system that fumigates bulk produce within a forced air ozone reactor with low concentrations of gaseous ozone. Prior trials demonstrated that a 2-log reduction of a Listeria surrogate could be achieved throughout a 500 kg batch of apples using the reactor although the distribution of ozone through the produce bed is unknown. The current study was undertaken to gain a better understanding of the ozone transport and flow dynamics within the reactor. Measurements of ozone concentrations, air flow rates, pressure, temperatures, and humidity were collected and recorded during system operation to characterize the system pressure losses, thermal characteristics and operating treatment conditions. It is concluded that a balance between superficial air velocity and initial ozone concentration is required to minimize pressure drops (energy cost) while maintaining well distributed airflow throughout the bed and to achieve desired microbial reduction. The data generated will enable the reactor design to be further optimized and applied to decontaminating a diverse range of produce type. en_US
dc.description.sponsorship NSERC, OCE, Moyers Apple Products Ltd. en_US
dc.language.iso en en_US
dc.rights Attribution-ShareAlike 4.0 International *
dc.rights.uri *
dc.subject Forced air ozone reactor en_US
dc.subject Bulk decontamination en_US
dc.subject Ozonation en_US
dc.subject Gaseous ozone en_US
dc.subject Produce en_US
dc.subject Apples en_US
dc.subject Porous media en_US
dc.subject Pressure distribution en_US
dc.title Gaseous Ozone Distribution Within a Forced Air Ozone Reactor for Bulk Produce Decontamination en_US
dc.type Thesis en_US Engineering en_US Master of Applied Science en_US School of Engineering en_US
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Attribution-ShareAlike 4.0 International Except where otherwise noted, this item's license is described as Attribution-ShareAlike 4.0 International