Half-life time of ozone as a function of air movement and conditions in a sealed container

McClurkin, J. D.; Maier, Dirk E.; Ileleji, Klein E.

doi:10.1016/j.jspr.2013.07.006

Cited by 89 publications

(49 citation statements)

References 15 publications

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“…When the air flow is 4 L min −1 and the power 6 W, the concentration of ozone measured at the gas outlet was 400 ppmv. Considering that (i) ozone is a long life‐time compound in air at atmospheric pressure (around 500 min in dry air at 40 °C) and that (ii) the residence time of the gas in the DBD reactor is lower than 2 min, the concentration of ozone in the reactor during the treatment is then equal to the concentration of ozone measured at the reactor outlet. In the absence of air flow, ozone was no more produced indicating a discharge “poisoning” phenomenon in the DBD reactor.…”

Section: Methodsmentioning

confidence: 99%

Mechanisms of Pyrene Degradation during Soil Treatment in a Dielectric Barrier Discharge Reactor

Ognier

Rojo

Liu

et al. 2014

Plasma Process. Polym.

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The remediation of pyrene contaminated sand using a dielectric barrier discharge reactor at atmospheric pressure is reported. The efficiency of ozone treatment has been studied and compared to the plasma treatment. In the case of ozone treatment, the pyrene removal reached rapidly a plateau and low removals (<50%) were therefore obtained. This phenomenon was explained by the formation of a layer of oxidized products that plays the role of a barrier and prevents ozone to react with the pollutants in the deep layers. In the case of a plasma treatment, the pyrene degradation efficiency was better and the plateau was not observed, allowing removals up to 95%. The effects of air flow rate and discharge power on pyrene removal were investigated. The results showed that the efficiency increased with the energy density (in J g−1soil), independently of the discharge power, but decreased with an increase of air flow. A thermal modeling showed that heating of the sand at the micro‐discharge impact may be high enough to increase dramatically the evaporation of pyrene, thus allowing all the pyrene molecules to be exposed to the oxidant species generated by the discharge. This phenomenon would explain the better performances obtained with plasma process compared to ozonation.

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Section: Methodsmentioning

confidence: 99%

Mechanisms of Pyrene Degradation during Soil Treatment in a Dielectric Barrier Discharge Reactor

Ognier

Rojo

Liu

et al. 2014

Plasma Process. Polym.

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“…Initial movement of ozone through the grain was obstructed by a phenomenon described as the ozone demand of the medium (Kim et al 1999). This interaction of one ozone molecule into other ozone molecules results in a breakdown of ozone to oxygen and, thus, a reduction in ozone concentration results (McClurkin and Maier 2010). Thus the rate of decay of ozone is also dependent on the surface characteristics of the materials with which it comes into contact (Hardin et al 2010).…”

Section: Decay Ratementioning

confidence: 99%

Decay Rate Kinetics of Ozone Gas in Rice Grains

Pandiselvam

Thirupathi

Rajamani

2015

Ozone: Science & Engineering

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The present study was carried out to evaluate the effects of ozone on rice grains for the following three conditions: saturation time, decay rate, and half-life of ozone. Experiments were performed in different bed thicknesses (5 and 10 cm) and moisture content (11.4 and 14.2% wb) at atmospheric conditions. The lowest saturation time of ozone was 119 min, with the concentration of 516 ppm for rice grains ozonated at 5-cm bed thickness with 11.4% (wb) moisture content. The decay rate kinetics of ozone obtained were consistent with a first-order model. Regarding the half-life of ozone, the lowest value obtained was 6.78 min for rice grains ozonated at 10-cm bed thickness with 14.2% (wb) moisture content.

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“…With increasing moisture content, the efficacy of ozone with respect to the mortality of pupae was found to decrease. When the moisture content increased from 12 to 16% (wb), the mortality of pupae decreased, which could be due to decay of ozone and formation of hydroxyl radicals in reaction with moisture . Ozone may react directly with dissolved substances present in the aqueous solution to form secondary oxidants such as ‐OH radicals, which then, themselves, react with the solutes and form a chain reaction of ozone depletion .…”

Section: Resultsmentioning

confidence: 99%

Disinfestation of stored wheat grain infested with Rhyzopertha dominica by ozone treatment: process optimization and impact on grain properties

et al. 2019

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BACKGROUND Ozone is a highly oxidative gas that has a long history of safe use as a disinfectant and sanitizer from producers of pharmaceuticals and many other organic compounds. In the current work, disinfestation of stored wheat grain infested with a common insect, Rhyzopertha dominica, was attempted through ozone (O3) treatment as an alternative to chemical fumigants. RESULTS The optimized treatment conditions for ozone fumigation of stored wheat grain were 12% (w/w) grain moisture, 2.5 g m−3 ozone concentration and 8 h of treatment. The mortality of R. dominica adults, pupae, larvae and eggs was 97, 100, 99 and 100%, respectively. Moisture and protein content of the ozone‐treated wheat was found to be lower as compared to infested wheat. Microstructural changes in the treated samples were clearly visible on scanning electron microscopy images, whereas minimal changes at the molecular level and of rheological parameters were evident based on Fourier transform infrared spectroscopy peak and rheometry data. CONCLUSION Ozone was found to be an effective reagent for disinfestation, aimed at all life stages of R. dominica in stored wheat grain, that leaves no residue behind. Rotational strategies can be applied to obtain increased mortality while maintaining the usability of the grain for different purposes. © 2019 Society of Chemical Industry

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Half-life time of ozone as a function of air movement and conditions in a sealed container

Cited by 89 publications

References 15 publications

Mechanisms of Pyrene Degradation during Soil Treatment in a Dielectric Barrier Discharge Reactor

Mechanisms of Pyrene Degradation during Soil Treatment in a Dielectric Barrier Discharge Reactor

Decay Rate Kinetics of Ozone Gas in Rice Grains

Disinfestation of stored wheat grain infested with Rhyzopertha dominica by ozone treatment: process optimization and impact on grain properties

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