Pub Date : 2022-01-03DOI: 10.1080/01919512.2021.2014333
T. Nakai, K. Kosaka, M. Asami, M. Akiba
ABSTRACT The fates of 2,6-dichloro-1,4-benzoquinone (DCBQ) precursors were evaluated according to their formation potentials (FPs) upon chlorination during ozone/biological activated carbon treatment at two water purification plants (WPPs). DCBQ-FP levels in raw waters were 19 and 21 ng/L. DCBQ-FPs were slightly reduced by coagulation, sedimentation, and rapid filtration, but to < 8 ng/L by ozonation, in contrast to changes in absorbance at 260 nm and trihalomethane (THM)-FPs. DCBQ-FPs of water after sedimentation at WPP and secondary effluents at sewage treatment plants were decreased to a much greater extent than total THM-FPs at low ozone doses. Thus, ozonation is effective for removal of DCBQ precursors.
{"title":"Removal of 2,6-dichloro-1,4-benzoquinone Precursors during Advanced Water Purification Process","authors":"T. Nakai, K. Kosaka, M. Asami, M. Akiba","doi":"10.1080/01919512.2021.2014333","DOIUrl":"https://doi.org/10.1080/01919512.2021.2014333","url":null,"abstract":"ABSTRACT The fates of 2,6-dichloro-1,4-benzoquinone (DCBQ) precursors were evaluated according to their formation potentials (FPs) upon chlorination during ozone/biological activated carbon treatment at two water purification plants (WPPs). DCBQ-FP levels in raw waters were 19 and 21 ng/L. DCBQ-FPs were slightly reduced by coagulation, sedimentation, and rapid filtration, but to < 8 ng/L by ozonation, in contrast to changes in absorbance at 260 nm and trihalomethane (THM)-FPs. DCBQ-FPs of water after sedimentation at WPP and secondary effluents at sewage treatment plants were decreased to a much greater extent than total THM-FPs at low ozone doses. Thus, ozonation is effective for removal of DCBQ precursors.","PeriodicalId":19580,"journal":{"name":"Ozone: Science & Engineering","volume":"9 1","pages":"208 - 216"},"PeriodicalIF":2.7,"publicationDate":"2022-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85108103","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-12-29DOI: 10.1080/01919512.2021.2016369
J. Mikeš, S. Pekárek, O. Hanuš
ABSTRACT This paper is devoted to studying the effect of airflow orientation on the microdischarges of the surface dielectric barrier discharge in cylindrical configuration through varying air input into the discharge chamber, the number of input nozzles, and the geometry of the active electrode. The air is supplied into the discharge chamber tangentially, radially, or axially through one or four input nozzles. Air input into the discharge chamber and the number of input nozzles determine the airflow regime. We used two active electrode geometries that are the axial strips or azimuthal rings. The change of active electrode geometry from rings to strips affects the orientation of microdischarges with respect to the airflow. For the discharge, the variation of air inputs and the number of input nozzles influences the flow regime in the discharge chamber, which, together with the active electrode geometry, affects the temperature field distribution in the chamber. These factors play an important role in plasmachemical processes leading to the discharge generation of various species, such as ozone. It is found that, for the maximum effect of airflow on discharge ozone generation, the streamlines should be uniformly distributed in the discharge chamber and predominantly oriented perpendicular to the majority of microdischarges.
{"title":"Surface Dielectric Barrier Discharge in a Cylindrical Configuration – Effect of Airflow Orientation to the Microdischarges","authors":"J. Mikeš, S. Pekárek, O. Hanuš","doi":"10.1080/01919512.2021.2016369","DOIUrl":"https://doi.org/10.1080/01919512.2021.2016369","url":null,"abstract":"ABSTRACT This paper is devoted to studying the effect of airflow orientation on the microdischarges of the surface dielectric barrier discharge in cylindrical configuration through varying air input into the discharge chamber, the number of input nozzles, and the geometry of the active electrode. The air is supplied into the discharge chamber tangentially, radially, or axially through one or four input nozzles. Air input into the discharge chamber and the number of input nozzles determine the airflow regime. We used two active electrode geometries that are the axial strips or azimuthal rings. The change of active electrode geometry from rings to strips affects the orientation of microdischarges with respect to the airflow. For the discharge, the variation of air inputs and the number of input nozzles influences the flow regime in the discharge chamber, which, together with the active electrode geometry, affects the temperature field distribution in the chamber. These factors play an important role in plasmachemical processes leading to the discharge generation of various species, such as ozone. It is found that, for the maximum effect of airflow on discharge ozone generation, the streamlines should be uniformly distributed in the discharge chamber and predominantly oriented perpendicular to the majority of microdischarges.","PeriodicalId":19580,"journal":{"name":"Ozone: Science & Engineering","volume":"52 1","pages":"2 - 18"},"PeriodicalIF":2.7,"publicationDate":"2021-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90796734","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-12-12DOI: 10.1080/01919512.2021.2009332
P. Dhevagi, A. Ramya, S. Priyatharshini, R. Poornima
ABSTRACT Tropospheric ozone (O3) is widely recognized as the most critical, regional atmospheric pollutant causing significant losses to agricultural productivity due to its phytotoxicity over agricultural areas and is expected to increase in future. In view of rising tropospheric ozone concentration over Indian regions, the present study aimed to evaluate the effect of elevated ozone stress on pulse crop blackgram (Vigna mungo L.), which contributes the major share of protein. The blackgram varieties namely CO 6, VBN 1, VBN 2, VBN 3, VBN 5, VBN 6, VBN 7, and VBN 8 were grown in open top chambers and factorial completely randomized block design was followed. The plants were exposed to elevated ozone concentration (50 and 100 ppb) from 10.00 h to 17.00 h over 10 days at flowering stage, with a weighted average ozone concentration of 50.1 and 101.2 ppb. Both the elevated ozone treatments significantly affected the plant physiological, biochemical, growth, and yield traits of all test varieties. On an average across eight blackgram varieties, decrease in chlorophyll content by 33.83 and 42.41%, stomatal conductance by 28.25 and 40.51% and photosynthetic rate by 29.43 and 42.30% exposed to 50 and 100 ppb ozone were observed, respectively. Correspondingly, the number of pods per plant decreased by 30.82 and 32.65%, 100 grain weight by 7.75 and 21.23% and plant weight by 16.03 and 21.23%, respectively, which were significant at 5% level. Furthermore in the observed traits, significantly higher reduction was observed in VBN3, while the least reduction was observed in VBN8. The path analysis displayed that all the observed physiological, biochemical, growth, and yield traits positively regulated the yield except leaf injury percentage, malondialdehyde, and proline content. The principal component analysis of two elevated ozone treatments confirmed VBN8 as ozone tolerant and VBN3 as ozone sensitive variety. Hence, cultivation of VBN8 variety at ozone hotspot regions would be the best option to overcome ozone induced yield loss.
{"title":"Effect of Elevated Tropospheric Ozone on Vigna Mungo L. Varieties","authors":"P. Dhevagi, A. Ramya, S. Priyatharshini, R. Poornima","doi":"10.1080/01919512.2021.2009332","DOIUrl":"https://doi.org/10.1080/01919512.2021.2009332","url":null,"abstract":"ABSTRACT Tropospheric ozone (O3) is widely recognized as the most critical, regional atmospheric pollutant causing significant losses to agricultural productivity due to its phytotoxicity over agricultural areas and is expected to increase in future. In view of rising tropospheric ozone concentration over Indian regions, the present study aimed to evaluate the effect of elevated ozone stress on pulse crop blackgram (Vigna mungo L.), which contributes the major share of protein. The blackgram varieties namely CO 6, VBN 1, VBN 2, VBN 3, VBN 5, VBN 6, VBN 7, and VBN 8 were grown in open top chambers and factorial completely randomized block design was followed. The plants were exposed to elevated ozone concentration (50 and 100 ppb) from 10.00 h to 17.00 h over 10 days at flowering stage, with a weighted average ozone concentration of 50.1 and 101.2 ppb. Both the elevated ozone treatments significantly affected the plant physiological, biochemical, growth, and yield traits of all test varieties. On an average across eight blackgram varieties, decrease in chlorophyll content by 33.83 and 42.41%, stomatal conductance by 28.25 and 40.51% and photosynthetic rate by 29.43 and 42.30% exposed to 50 and 100 ppb ozone were observed, respectively. Correspondingly, the number of pods per plant decreased by 30.82 and 32.65%, 100 grain weight by 7.75 and 21.23% and plant weight by 16.03 and 21.23%, respectively, which were significant at 5% level. Furthermore in the observed traits, significantly higher reduction was observed in VBN3, while the least reduction was observed in VBN8. The path analysis displayed that all the observed physiological, biochemical, growth, and yield traits positively regulated the yield except leaf injury percentage, malondialdehyde, and proline content. The principal component analysis of two elevated ozone treatments confirmed VBN8 as ozone tolerant and VBN3 as ozone sensitive variety. Hence, cultivation of VBN8 variety at ozone hotspot regions would be the best option to overcome ozone induced yield loss.","PeriodicalId":19580,"journal":{"name":"Ozone: Science & Engineering","volume":"51 1","pages":"566 - 586"},"PeriodicalIF":2.7,"publicationDate":"2021-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79051343","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-11-01DOI: 10.1080/01919512.2021.1994367
S. Vijay Rakesh Reddy, D. S. Sudhakar Rao, R.R. Sharma, P. Preethi, R. Pandiselvam
ABSTRACT Consumers’ awareness toward nutritionally superior foods and improved knowledge of human health have enhanced the inclusion of fruits and vegetables as an integral part of regular dietary intake. However, concerns regarding the safety and quality of foods especially with reference to the outbreak of foodborne illnesses cause a major complication in the consumption of fruits and vegetables. Other major concerns, besides the safety of food from foodborne pathogens, include spoilage due to microbes and chemical pesticide residues. Traditionally, fresh fruits and vegetables are sanitized using chemicals, viz., chlorine, peracetic acid, electrolyzed water, hydrogen peroxide, etc. All these chemicals have been proven to exhibit ill effects over the consumers and the environment over a period of time, and thus, there is a great need for a safe alternative technique, which is eco-friendly and sustainable industrially. Ozone treatment is one such green technology available with multiple benefits such as antimicrobial nature, shelf life extension, pesticide residue removal, starch modification, waste water treatment, and many other industrial applications. It was also approved by FDA as a Generally Recognized As Safe (GRAS) sanitizer because of its eco-friendly nature (degradation into nonharmful oxygen after a short half-life) in addition to its inherent antimicrobial and antiethylene activity. This review focouses on ozone, its mode of action, and its applications in different horticultural crops with potential industrial use.
{"title":"Role of Ozone in Post-Harvest Disinfection and Processing of Horticultural Crops: A Review","authors":"S. Vijay Rakesh Reddy, D. S. Sudhakar Rao, R.R. Sharma, P. Preethi, R. Pandiselvam","doi":"10.1080/01919512.2021.1994367","DOIUrl":"https://doi.org/10.1080/01919512.2021.1994367","url":null,"abstract":"ABSTRACT Consumers’ awareness toward nutritionally superior foods and improved knowledge of human health have enhanced the inclusion of fruits and vegetables as an integral part of regular dietary intake. However, concerns regarding the safety and quality of foods especially with reference to the outbreak of foodborne illnesses cause a major complication in the consumption of fruits and vegetables. Other major concerns, besides the safety of food from foodborne pathogens, include spoilage due to microbes and chemical pesticide residues. Traditionally, fresh fruits and vegetables are sanitized using chemicals, viz., chlorine, peracetic acid, electrolyzed water, hydrogen peroxide, etc. All these chemicals have been proven to exhibit ill effects over the consumers and the environment over a period of time, and thus, there is a great need for a safe alternative technique, which is eco-friendly and sustainable industrially. Ozone treatment is one such green technology available with multiple benefits such as antimicrobial nature, shelf life extension, pesticide residue removal, starch modification, waste water treatment, and many other industrial applications. It was also approved by FDA as a Generally Recognized As Safe (GRAS) sanitizer because of its eco-friendly nature (degradation into nonharmful oxygen after a short half-life) in addition to its inherent antimicrobial and antiethylene activity. This review focouses on ozone, its mode of action, and its applications in different horticultural crops with potential industrial use.","PeriodicalId":19580,"journal":{"name":"Ozone: Science & Engineering","volume":"12 1","pages":"127 - 146"},"PeriodicalIF":2.7,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73492596","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-10-06DOI: 10.1080/01919512.2021.1983409
Fares Daoud, S. Zühlke, M. Spiteller, O. Kayser
ABSTRACT During production of diethylenetriaminepentaacetic acid (DTPA), process waste water is generated in several production stages. Process wastewater is usually disposed of via waste water treatment plants. However, due to low biodegradability of DTPA in conventional waste water treatment, incineration constitutes the current method of choice. The main disadvantage of incineration is high consumption of primary energy sources leading to substantial emission of carbon dioxide (CO2). Thus, an alternative method of process waste water treatment was investigated, which consists of an initial application of ozone and a subsequent biological treatment. In 2009, preliminary laboratory experiments were conducted to evaluate the elimination of DTPA in process waste water. Based on the initial results, the responsible authorities granted approval for large-scale ozonation of DTPA-containing wastewater in 2011. Additional laboratory scale experiments were carried out to assess the elimination of the target compound and the generation of its main transformation products using liquid chromatography – high resolution mass spectrometry. Through application of the postulated method, the concentration of DTPA and its derivatives can be reduced to levels assuring safe discharge into the receiving water. Additionally, a comparison of CO2 emissions showed that ozonation is an ecological alternative to incineration and, most likely, an economical as well, based on the local prices of primary energy sources.
{"title":"Elimination of Diethylenetriaminepentaacetic Acid from Effluents from Pharmaceutical Production by Ozonation","authors":"Fares Daoud, S. Zühlke, M. Spiteller, O. Kayser","doi":"10.1080/01919512.2021.1983409","DOIUrl":"https://doi.org/10.1080/01919512.2021.1983409","url":null,"abstract":"ABSTRACT During production of diethylenetriaminepentaacetic acid (DTPA), process waste water is generated in several production stages. Process wastewater is usually disposed of via waste water treatment plants. However, due to low biodegradability of DTPA in conventional waste water treatment, incineration constitutes the current method of choice. The main disadvantage of incineration is high consumption of primary energy sources leading to substantial emission of carbon dioxide (CO2). Thus, an alternative method of process waste water treatment was investigated, which consists of an initial application of ozone and a subsequent biological treatment. In 2009, preliminary laboratory experiments were conducted to evaluate the elimination of DTPA in process waste water. Based on the initial results, the responsible authorities granted approval for large-scale ozonation of DTPA-containing wastewater in 2011. Additional laboratory scale experiments were carried out to assess the elimination of the target compound and the generation of its main transformation products using liquid chromatography – high resolution mass spectrometry. Through application of the postulated method, the concentration of DTPA and its derivatives can be reduced to levels assuring safe discharge into the receiving water. Additionally, a comparison of CO2 emissions showed that ozonation is an ecological alternative to incineration and, most likely, an economical as well, based on the local prices of primary energy sources.","PeriodicalId":19580,"journal":{"name":"Ozone: Science & Engineering","volume":"90 1","pages":"473 - 485"},"PeriodicalIF":2.7,"publicationDate":"2021-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86451221","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-10-05DOI: 10.1080/01919512.2021.1984203
Ana Romeo-Oliván, M. Pagès, Coralie Breton, F. Lagarde, Hubert Cros, O. Yobrégat, F. Violleau, A. Jacques
ABSTRACT Grapevine trunk diseases can infect nursery plants at different stages of propagation. Here, we evaluated the efficiency of aqueous ozone against two fungi associated with trunk diseases (Phaeoacremonium minimum and Phaeomoniella chlamydospora). The effect of ozone on the plant growth is also studied. Aqueous ozone completely suppressed spore germination in vitro. In planta fungal development was reduced six weeks post-inoculation. In the nursery, ozone treatment was comparable to the usual chemical treatment. Irrigation with aqueous ozone had no negative effects on plant growth. These anti-fungal properties and the absence of phytotoxicity make ozone a promising alternative for controlling microbial infection in nurseries.
{"title":"Ozone Dissolved in Water: An Innovative Tool for the Production of Young Plants in Grapevine Nurseries?","authors":"Ana Romeo-Oliván, M. Pagès, Coralie Breton, F. Lagarde, Hubert Cros, O. Yobrégat, F. Violleau, A. Jacques","doi":"10.1080/01919512.2021.1984203","DOIUrl":"https://doi.org/10.1080/01919512.2021.1984203","url":null,"abstract":"ABSTRACT Grapevine trunk diseases can infect nursery plants at different stages of propagation. Here, we evaluated the efficiency of aqueous ozone against two fungi associated with trunk diseases (Phaeoacremonium minimum and Phaeomoniella chlamydospora). The effect of ozone on the plant growth is also studied. Aqueous ozone completely suppressed spore germination in vitro. In planta fungal development was reduced six weeks post-inoculation. In the nursery, ozone treatment was comparable to the usual chemical treatment. Irrigation with aqueous ozone had no negative effects on plant growth. These anti-fungal properties and the absence of phytotoxicity make ozone a promising alternative for controlling microbial infection in nurseries.","PeriodicalId":19580,"journal":{"name":"Ozone: Science & Engineering","volume":"43 1","pages":"521 - 535"},"PeriodicalIF":2.7,"publicationDate":"2021-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72458439","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-10-04DOI: 10.1080/01919512.2021.1984207
Milagros Basail Pérez, José Efraín González, Vaniert Ventura Chavez, Rosa Elena González Vazquez, O. Portal
ABSTRACT Taro is a food source for many people in tropical countries. The use of biotechnological techniques for seed production is an alternative that allows obtaining propagation material of higher phytosanitary quality. During the taro in vitro propagation it is of great importance to increase the efficiency of the protocols that are affected mainly by the incidence of microbial contamination and low multiplication coefficients. At the initiation stage, 100% of taro apical meristems sprouted with the immersion in water-dissolved ozone at 2 ppm for 15 min. Furthermore, the microbial contamination was eliminated and the explants showed better quality, increasing the multiplication coefficient in the subsequent subcultures. The disinfection strategy applied allowed to rise the number of taro explants by more than three times, increasing the economic efficiency of the process.
{"title":"Water-dissolved Ozone Mediates Optimization of Biotechnological Seed Production of Colocasia esculenta (L.) Schott","authors":"Milagros Basail Pérez, José Efraín González, Vaniert Ventura Chavez, Rosa Elena González Vazquez, O. Portal","doi":"10.1080/01919512.2021.1984207","DOIUrl":"https://doi.org/10.1080/01919512.2021.1984207","url":null,"abstract":"ABSTRACT Taro is a food source for many people in tropical countries. The use of biotechnological techniques for seed production is an alternative that allows obtaining propagation material of higher phytosanitary quality. During the taro in vitro propagation it is of great importance to increase the efficiency of the protocols that are affected mainly by the incidence of microbial contamination and low multiplication coefficients. At the initiation stage, 100% of taro apical meristems sprouted with the immersion in water-dissolved ozone at 2 ppm for 15 min. Furthermore, the microbial contamination was eliminated and the explants showed better quality, increasing the multiplication coefficient in the subsequent subcultures. The disinfection strategy applied allowed to rise the number of taro explants by more than three times, increasing the economic efficiency of the process.","PeriodicalId":19580,"journal":{"name":"Ozone: Science & Engineering","volume":"1 1","pages":"536 - 544"},"PeriodicalIF":2.7,"publicationDate":"2021-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83060602","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-10-04DOI: 10.1080/01919512.2021.1984204
Ö. Uslu, A. Erol, O. Gedik, Fatma Akbay
ABSTRACT Various effects of ozone treatment on seed germination and development are known. This feature of ozone has gained more importance in recent years. On the other hand, it is reported that ozone used in excessive amounts causes adverse effects. The method of application of ozone and the results obtained vary according to the material used. In this study, two different vetch species (hairy vetch and common vetch), for 30 minutes four different ozone doses application [control (0.40 g/m3), 1.60 g/m3, 2.80 g/m3, 4.00 g/m3] and three different temperatures (10, 15 and 20 °C) were examined. As a result of applications; germination rate, radicle length, plumule length, seedling length, seedling fresh weight, seedling dry weight and vigor index values were calculated. It was determined that plumule length, seedling length, seedling fresh weight and vigor index values of the species were affected by ozone doses and temperature applications. Also, it was determined that the cultivar ˟ temperature ˟ ozone dose interaction had significant effects on the length of the radicle (P < 0.01) and the seedling fresh weight (P < 0.05). According to the results of the study; it has been determined that the applications of ozonized water up to 2.80 g/m3 positively affect the germination, radicle and seedling development of hairy vetch and common vetch seeds compared to the control. Besides, it was observed that the highest dose, 4.00 g/m3 dose, negatively affected the same parameters. It was found that the effect of temperature and ozone dose applications were significant on germination and seedling development.
{"title":"Determination of the Effects of Different Aqueous Ozone Doses and Temperature on Germination and Seedling Development of Vetch Seeds","authors":"Ö. Uslu, A. Erol, O. Gedik, Fatma Akbay","doi":"10.1080/01919512.2021.1984204","DOIUrl":"https://doi.org/10.1080/01919512.2021.1984204","url":null,"abstract":"ABSTRACT Various effects of ozone treatment on seed germination and development are known. This feature of ozone has gained more importance in recent years. On the other hand, it is reported that ozone used in excessive amounts causes adverse effects. The method of application of ozone and the results obtained vary according to the material used. In this study, two different vetch species (hairy vetch and common vetch), for 30 minutes four different ozone doses application [control (0.40 g/m3), 1.60 g/m3, 2.80 g/m3, 4.00 g/m3] and three different temperatures (10, 15 and 20 °C) were examined. As a result of applications; germination rate, radicle length, plumule length, seedling length, seedling fresh weight, seedling dry weight and vigor index values were calculated. It was determined that plumule length, seedling length, seedling fresh weight and vigor index values of the species were affected by ozone doses and temperature applications. Also, it was determined that the cultivar ˟ temperature ˟ ozone dose interaction had significant effects on the length of the radicle (P < 0.01) and the seedling fresh weight (P < 0.05). According to the results of the study; it has been determined that the applications of ozonized water up to 2.80 g/m3 positively affect the germination, radicle and seedling development of hairy vetch and common vetch seeds compared to the control. Besides, it was observed that the highest dose, 4.00 g/m3 dose, negatively affected the same parameters. It was found that the effect of temperature and ozone dose applications were significant on germination and seedling development.","PeriodicalId":19580,"journal":{"name":"Ozone: Science & Engineering","volume":"1 1","pages":"512 - 520"},"PeriodicalIF":2.7,"publicationDate":"2021-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88753307","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-09-28DOI: 10.1080/01919512.2021.1984206
Raouf Aslam, M. S. Alam, R. Pandiselvam
ABSTRACT The study was carried out to design and develop an ozonation treatment system for the sanitization of fresh produce before storage. The developed system was evaluated for minimally processed onions based on the kinetics of degradation, application methods, homogeneity of dissolution, and specific energy consumption. The sanitization process was then optimized for cut onion slices using a Box-Behnken design under Response Surface Methodology to study the effects of ozone concentration (1–5 ppm), exposure time (3–8 min), and aqueous pH (3–5) on microbial log reductions, pyruvate content, color change, and overall acceptability. The results obtained showed that degradation kinetics of dissolved ozone followed a first-order reaction with a half-life of 18.23 min. Among the different methods of ozone application tested at 5 ppm ozone concentration, the splashing method yielded the highest microbial log reductions (5.04) followed by dipping (4.5) and spraying (4.22) methods. For the sanitization of cut slices of onion, it was observed that aqueous ozone at 5 ppm concentration splashed on the surfaces for 8 min and an aqueous pH of 3.01 yielded optimized sanitization, whereas microbial log reductions, pyruvate content, and overall acceptability were recorded as 5.6 log reductions, 0.127 µM/mL, and 8.2, respectively. Overall, the system was found to be effective for the sanitization of minimally processed onions.
{"title":"Aqueous Ozone Sanitization System for Fresh Produce: Design, Development, and Optimization of Process Parameters for Minimally Processed Onion","authors":"Raouf Aslam, M. S. Alam, R. Pandiselvam","doi":"10.1080/01919512.2021.1984206","DOIUrl":"https://doi.org/10.1080/01919512.2021.1984206","url":null,"abstract":"ABSTRACT The study was carried out to design and develop an ozonation treatment system for the sanitization of fresh produce before storage. The developed system was evaluated for minimally processed onions based on the kinetics of degradation, application methods, homogeneity of dissolution, and specific energy consumption. The sanitization process was then optimized for cut onion slices using a Box-Behnken design under Response Surface Methodology to study the effects of ozone concentration (1–5 ppm), exposure time (3–8 min), and aqueous pH (3–5) on microbial log reductions, pyruvate content, color change, and overall acceptability. The results obtained showed that degradation kinetics of dissolved ozone followed a first-order reaction with a half-life of 18.23 min. Among the different methods of ozone application tested at 5 ppm ozone concentration, the splashing method yielded the highest microbial log reductions (5.04) followed by dipping (4.5) and spraying (4.22) methods. For the sanitization of cut slices of onion, it was observed that aqueous ozone at 5 ppm concentration splashed on the surfaces for 8 min and an aqueous pH of 3.01 yielded optimized sanitization, whereas microbial log reductions, pyruvate content, and overall acceptability were recorded as 5.6 log reductions, 0.127 µM/mL, and 8.2, respectively. Overall, the system was found to be effective for the sanitization of minimally processed onions.","PeriodicalId":19580,"journal":{"name":"Ozone: Science & Engineering","volume":"40 1","pages":"3 - 16"},"PeriodicalIF":2.7,"publicationDate":"2021-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86221742","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-09-26DOI: 10.1080/01919512.2021.1983410
F. Sabbah, W. Domb
ABSTRACT Dentists wish to prepare enough volume to meet the dental office ozonated water consumption and to reach the desired concentration in the least amount of ozonation time. Several factors affect ozone gas mass transfer in water and the corresponding ozonated water concentration can be measured with analytical or direct in-line monitoring methods. An alternative, ozone gas solubility ratio (SR) may be used as a reference to predict ozonated water concentration. SR of 0.25 is often cited in the literature, but it can vary between 0.2 and 0.4 according to different ozonation configurations and parameters. A total of 70 tests were performed using different ozonation configurations which are commonly used in dental practice. Ozone concentration in water was measured and the SR was calculated. SR varied between 0.13 and 0.4. To our knowledge, this study has never been carried out before and aims to propose practical guidelines on selecting the optimum water ozonation configurations in dental practice, as well as to calculate their corresponding dissolved ozone concentration.
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