CFD simulation of ozone gas flow for controlling Sitophilus zeamais in rice grains

Silva, Marcus V.; Faroni, L. R. D.; Martins, Márcio Arêdes; Sousa, Adalberto Hipólito de; Bustos-Vanegas, Jaime Daniel

doi:10.1016/j.jspr.2020.101675

Cited by 13 publications

(15 citation statements)

References 77 publications

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“…Carvalho et al 25 also studied nitrogen gas concentration for refrigeration and atmosphere modification in corn storage. In a similar approach, Silva et al 26 performed Computational Fluid Dynamics (CFD) simulations of ozone gas for the control of the maize weevil, Sitophilus zeamais (Motschulsky) (Coleoptera: Curculionidae) in rice grains. Furthermore, Pandiselvam et al 27 used numerical simulations to predict ozone concentration and flow characteristics in bulked paddy rice.…”

Section: Introductionmentioning

confidence: 99%

“…The implementation of numerical modeling has been used to some extent in similar applications, but we were unable to find studies relevant to the parameters of the present work. For example, Silva et al 26 performed CFD simulations of ozone gas for controlling the maize weevil, S. zeamais (Motschulsky) (Coleoptera: Curculionidae) in rice grains. Pandiselvam et al 27 used numerical simulations to predict ozone concentration and flow characteristics in paddy bulk.…”

Section: Introductionmentioning

confidence: 99%

“…also studied nitrogen gas concentration for refrigeration and atmosphere modification in corn storage. In a similar approach, Silva et al 26 . performed Computational Fluid Dynamics (CFD) simulations of ozone gas for the control of the maize weevil, Sitophilus zeamais (Motschulsky) (Coleoptera: Curculionidae) in rice grains.…”

Section: Introductionmentioning

confidence: 99%

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Utilizing low oxygen to mitigate resistance of stored product insects to phosphine

2022

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BACKGROUND Data are provided on the utilization of modified atmospheres, at a commercial scale, against stored product insect populations that are resistant to phosphine. The method is evaluated on different populations of two major stored‐product beetle species, Rhyzopertha dominica and Oryzaephilus surinamensis. The trials were carried out in commercial facilities, in which nitrogen was introduced through an embedded nitrogen generator. Each chamber contained three or four pallets of either currants or herbs. A computational model was developed to evaluate the nitrogen concentration. RESULTS In most trials, 100% mortality was recorded for both beetle species and all populations, regardless of the temperature and exposure intervals tested. Control progeny production ranged between 20 and 45 adults per vial for R. dominica, and 29 and 27 adults per vial for O. surinamensis. Simulation results reveal that nitrogen can easily penetrate the currants, and its concentration is uniform (differences are below 1.5%) across the pallet. Additionally, the simulation model revealed that lower temperatures do not have an impact on the nitrogen concentration profiles. CONCLUSIONS The modified atmosphere applications evaluated here were proved to be effective for all populations, regardless of the level of resistance to phosphine, and any survival could be attributed to the short exposure intervals. Modified atmosphere applications can be effective at a considerably short exposure interval, even at 2.5 days, which is an incontestable advantage for the use of this method against insects, at exposures comparable with those of commercial fumigations. © 2022 Society of Chemical Industry.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Utilizing low oxygen to mitigate resistance of stored product insects to phosphine

2022

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“…30,51 In the present study, the half-life inside the package was expected to be shorter, as the ozone reaction rates in the presence of grains are higher. 52,53 However, it should be noted that the reaction rates of ozone gas applied in low-pressure injection systems are influenced by the gas-flow dynamics. 22 In this ozone application system, the pressure difference associated with the concentration gradient is responsible for the gas flowing into the package.…”

Section: Discussionmentioning

confidence: 99%

“…65 The high ozone reaction rate might also be associated with rice composition, as high reaction rates imply low ozone concentrations in the intergranular space. 52,53 Polished rice is 90% starch. 66,67 When reacting with ozone, the gas breaks down the starch granules by oxidation.…”

Section: Discussionmentioning

confidence: 99%

Low‐pressure ozone injection system: relationship between reaction kinetics and physical properties of grains

et al. 2022

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BACKGROUND The ozonation of grains in a closed system at low pressure is a strategy with the potential for treating packaged products. Research is necessary to characterize the reaction kinetics of ozone in this type of injection system so that it is possible to design chambers and determine the ozone concentrations suitable for commercial‐scale applications. The objective of this study was therefore to characterize the low‐pressure ozone injection system in relation to the physical properties of the grains and determine possible changes in their quality. Samples (5 kg each) of common beans, cowpea beans, corn, popcorn kernels, paddy rice, and polished rice were exposed to ozone in a 70 L hypobaric chamber. Initially, the internal pressure of the chamber was reduced to 500 hPa. Then, ozone was injected at a concentration of 32.10 g m−3 at a volumetric flow rate of 1 L min−1 until reaching a pressure of 1000 hPa. To relate the decomposition of ozone to the grains that were being evaluated, different physical properties were determined, and quality analysis was conducted. RESULTS Ozone gas half‐life outside and inside the package depended on the grain type. Ozone decomposition was quickest in polished rice and slowest in common beans. The half‐life of the different grains ranged from 17.8 to 52.9 and 16.4 to 52.9 min, outside and inside the package, respectively. Considering the physical properties, specific surface (Ss), surface area (SA), and sphericity (φ) exhibited a significant correlation with the decomposition rate constant (k) of ozone. However, the variables volume (V), permeability (K), porosity (ε), and specific mass (ρ) showed no correlation with k. CONCLUSION The physical properties of grain influenced the reaction kinetics of ozone gas during the low‐pressure injection process. Ozone gas injection at low pressures did not alter the quality attributes of the grains under study. © 2022 Society of Chemical Industry.

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Ozone reduces lifespan and alters gene expression profiles in Rhyzopertha dominica (Fabricius)

Wen

Guo

et al. 2022

3 Biotech

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CFD simulation of ozone gas flow for controlling Sitophilus zeamais in rice grains

Cited by 13 publications

References 77 publications

Utilizing low oxygen to mitigate resistance of stored product insects to phosphine

Utilizing low oxygen to mitigate resistance of stored product insects to phosphine

Low‐pressure ozone injection system: relationship between reaction kinetics and physical properties of grains

Ozone reduces lifespan and alters gene expression profiles in Rhyzopertha dominica (Fabricius)

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