In this study, the treatment of diclofenac (DCF), which is a pain reliever belonging to non-steroid anti-inflammatory drug group, was investigated by ozone-based oxidation processes. In experiments; pH (6–7) and 10 min reaction times were kept constant and the effects of different initial concentrations (5 mg/L, 10 mg/L and 20 mg/L), ozone doses (5 and 8 ppm), power of UV lamps (16 W and 32 W) and

The application of a heterogeneous catalytic ozonation process with magnesium oxide (MgO) nanoparticles for the degradation of benzene in aqueous solutions was investigated by a Central Composite Design to optimize experimental conditions. Analysis of variance (ANOVA) was used for studying the significance and adequacy of the model. Four independent variables including pH (3–12), catalyst dose (0.1–0

Catalyst of Fe–Co-layered double hydroxide (LDH) prepared by co-precipitation could effectively improve the degradation of pharmaceutical intermediate – p-toluenesulfonic acid (p-TSA) in the water during ozonation. The experimental results showed that under the condition of pH 7.9, catalyst dosage 0.1 g/L and aqueous ozone concentration 6.2 mg/L, 20 mg/L of p-TSA obtained a TOC removal percentage

This work evaluated the ozonation of cassava starch, correlating the process conditions with starch structure and properties. The starch structure was evaluated considering both molecules and granules. Ozonation resulted in an increased number of carbonyl and carboxyl groups with increasing ozone consumption. Moreover, a reduction of large and branched molecules was observed, with the consequent increase

The detailed reaction mechanisms for degrading typical biomass tar components (toluene, phenol and naphthalene) by ozone were investigated by employing Density Functional Theory and ab-initio methods. Results showed that toluene, phenol and naphthalene were degraded by ozone in a similar way by destroying C=C bonds and aromatic ring. For toluene and phenol, ozone preferentially destroys C=C bonds at

(2020). Statement on COVID-19. Ozone: Science & Engineering: Vol. 42, No. 3, pp. 211-212.

The purpose of the current study was to investigate the effect of ozone exposure on the process of water uptake and germination of lentil (Lens culinaris) seeds. For this, a commercial ozone generator that provides a concentration of 1 g/m3 generated from atmospheric air was used. In the experiments 10 lentil seeds were used per treatment carried out at different times of exposure to ozone: 2, 3, 5

This paper summarizes the review of developments in the area of ozone-based elemental chlorine free (ECF) and total chlorine free (TCF) bleaching of wood and non-wood pulps. Focused areas of review are reaction mechanism of ozone with carbohydrates and lignin, effect of process conditions maintained during ozone bleaching on pulp properties, effect of using different cellulose protectors, effect of

This study aimed to develop and validate a mathematical model for predicting ozone propagation and distribution in a bench-scale storage silo of soybean and link the model results to its application as an antifungal. The reduction of potentially toxigenic fungi found in soybeans was also evaluated after the ozone treatment. Experimental validation consisted of the ozone application and concentration

ZnFe2O4 supported on graphene nanosheets (ZnFe2O4@GNs) was prepared by a one-step hydrothermal method. Characterization results of XRD and SEM demonstrated that ZnFe2O4 has been anchored on the surface of graphene nanosheets. After four successive cycles, removal efficiency of congo red is 88.66% by ZnFe2O4@GNs while 39.80% by ZnFe2O4, suggesting high photocatalytic stability of ZnFe2O4@GNs under simulated

The coefficient of variation (COV) of ozone residual is often used to compare the mixing performance of different ozone contacting systems. Multiphase mass transfer CFD modeling is performed and compared with experimental data to investigate the correlation between mass transfer efficiency, a corresponding full cross-sectional spatial COV, a corresponding “grab sample” temporal COV, and a comprehensive

Solids removal is very important for water quality maintenance in recirculating aquaculture systems (RAS). Ozonation is a practical water treatment which can promote the solids removal. However, the characteristics of ozonation effects on particles are still unclear. In this study, the effect of ozonation on particle size distribution (PSD) was investigated for seawater from a RAS of Pacific white

For this article, the authors tested various commercially available materials, such as activated carbon of vegetable origin, kaolin, vermiculite, Portland cement, magnetite and Earth´s Fuller to identify which is the best catalyst in the production of hydroxyl radical. The researchers used oxalic acid as a test compound to quantify the production of hydroxyl radical, taking advantage of the rapid reaction

Heterogeneous catalytic ozonation is an efficient technology for degrading refractory organic pollutants in water. However, most studied heterogeneous catalysts for catalytic ozonation were powders, which were not practically available for continuous fixed-bed reactor in water treatment. In this work, manganese, iron and cerium oxides on γ-Al2O3 pellets were synthesized and used as heterogeneous catalysts

The capability of ozone to reduce the hazardous impact of environmentally persistent antibiotic tiamulin in term of toxicity reduction and enhancement of biodegradability was investigated. Different ozone doses were applied but ozonation was not effective enough to increase the biodegradability of tiamulin in the aqueous phase. The opposite effect was observed in anaerobic digestion experiments, where

Nematodes are among the organisms most commonly found in treated water. Although they are believed to be harmless, colonization of nematodes by pathogenic bacteria may transform them into harmful contaminants of the drinking water. Thus, efficient disinfectants must be applied to inactivate and remove nematodes. In the present study, nematode inactivation using different concentrations of ozone, chlorine

In view of the increasing interest in the occurrence and spread of antibiotic-resistant bacteria due to wastewater treatment systems into the environment, total colony counts and antibiotic-resistant bacteria were determined in regard to a conventional wastewater treatment plant and its upgrade with a wastewater ozonation. To cope with the elimination of conventionally not sufficiently decimated micropollutants

(2020). Spread the Word! Ozone: Science & Engineering: Vol. 42, No. 2, pp. 105-107.

This study investigates the removal of a model pollutant, nitrobenzene (NB), from water by combining adsorption onto a new catalyst cobalt supported on activated carbon (Co/AC) and regeneration with ozone. The adsorption equilibrium isotherms of NB onto the raw activated carbon (AC) and the new catalyst enabled the effect of cobalt on the adsorption capacity of the raw carbon. The Nitrobenzene adsorption

The efficiency of the integrated UV/O3/persulfate (PS) process was preliminarily explored with the emphasis on the pollutant removal performance and reactive radical contributions in this study. The results demonstrated that the integrated UV/O3/PS process was significantly efficient with the pseudo-first-order rate constants of atrazine (ATZ) degradation increased by 18.7, 3.3 and 2.6 times compared

Ozone disinfection is an efficient method, but it has no persistent disinfection effect, which is the main factor restricting its development. However, tea polyphenols are a renewable green resource and have continuous disinfection effect in drinking water treatment. Thus, it is beneficial to make tea polyphenols an auxiliary disinfectant to ozone disinfection, explore the combined disinfection effect

The aim of this study was to evaluate the use of ozone as cavity disinfectant on the bonding strength to dentin of different antibacterial bonding agents. The study was conducted on 60 cavity-free 3rd molar teeth. The prepared samples were separated into 3 groups. These groups were each sub-divided into 2 groups of 10 as a group with ozone applied and a control group. In Group 1a, ozone was applied

The aim of the research is to choose the most efficient adsorbent for two-stage ozone-sorption purification of groundwater containing both trichloroethylene (TCE) and tetrachloroethylene (PCE) between three carbon sorbents produced in Russia (AUT-M, CAUSORB-221, and AG-3). Sorption isotherms of TCE and PCE on AUT-M and CAUSORB-221 at 296 K were fitted by the Freundlich equation. The better TCE and

This present study aims to evaluate the stratospheric ozone that was continuously measured during 2016 over Campo Grande, the capital of South Mato Grosso state, Brazil. To determine the best-adjusted distribution describing the ozone (O3) co-generation data in Campo Grande, 15 functions were used while modeling the numerical results. Five sets of data were used: the entire year, spring (September

The aim of this study is to evaluate the quality index, functional groups changes, and antimicrobial activity of ozonized pomegranate seeds oil (OPSO). Results have shown that peroxide and acidity values were increased with ozonation times. The FT-IR and 1 H NMR analyses of oil samples have confirmed chain scission at C = C bonds of the fatty acid chains during ozonation and the formation of new carbonyl

This paper presents the results of the statistical modeling of the ozone concentration in Campo Grande, Brazil in 2016. Five sets of data, summer (January–March), autumn (April–June), winter (July–September), spring (October–December), and all year round were used. The results show that the maximum concentrations of oxidants occur at 3:00 p.m., the diurnal NO variation, the concentrations show a cycle

Catalytic ozonation of organic dyestuffs such as Methylene-Blue (MB) and Malachite Green (MG) was investigated in the presence of montmorillonite K10 and its Al-Fe modified counterpart (AF-K10). Adsorption was found to play akey-role involving specific acid-base, electrostatic, and/or hydrophilic/organophilic interactions according to the dye molecule and catalyst surface properties. MG turned out

The Rhipicephalus sanguineus s. l. has great medical and veterinary importance posing severe risks to the well-being of pets and public health. The ozone is a promising alternative for control of this ectoparasites, by not causing environmental contamination or threatening public health. Due to the fact that the integument is the organ that first comes into contact with topically applied acaricides

Measurement of dissolved ozone (O3) residual is critical for accurately determining O3 concentration-contact time product (CT) in order to establish pathogen removal credit. Higher concentrations of metals and organics in wastewater present more challenging conditions for on-line meters, requiring more frequent calibration and maintenance. This study evaluated the performance, maintenance, and cost

The decolorization of acid black azo dye by three ozone-based advanced oxidation processes, viz. O3, O3/UV, O3/Fe (II) were studied by developing prediction model using Response Surface Methodology (RSM) and Artificial Neural Network (ANN) techniques. The decolorization is determined through the absorbance wavelength of dye using UV-Vis spectrophotometer. The central composite design experiment was

Alternative bleaching processes for cotton fabrics are presented in this study. The fabrics were pretreated with three different alternative methods which are termed here as cold bleaching process. These methods are ozone application alone (CP1), ozone-sodium persulfate application (CP2) and ozone-sodium perborate application (CP3). The results obtained from these cold bleaching processes were compared

This research aims to apply gaseous ozone to degrade pesticides (cypermethrin and dicofol) residues in dried basil leaves and to investigate their qualities after fumigation. Sweet basil, holy basil, hairy basil, and tree basil were fumigated with 200 mg/L gaseous ozone. The result showed that half-life of cypermethrin and dicofol in dried basil under ozone fumigation were in the range of 13.1–31.6

An ozone generation system using V-UV excimer lamps (172nm) and an optical measurement system based on the Beer–Lambert law were developed for an efficient low-temperature (15 °C-30 °C) sterilization of medical devices. Ozone concentrations between 100 and 1ʹ000 ppm (0.2–2 g/Nm3) were generated and the impact of several variables on the sterilization outcome were studied. The survivor curves of the

(2020). Editorial. Ozone: Science & Engineering: Vol. 42, No. 1, pp. 1-2.

The efficacies of ozonation and peroxone (O3/H2O2) pretreatments were compared for citric acid wastewater sludge conditioning with the objective of improving dewatering characteristics of the sludge. Treatment with 84 mg O3/g dry solid (DS) and 12.5 mg/g DS H2O2 greatly enhanced the effectiveness of ozonation, providing sludge dewaterability similar to that obtained by ozonation at 250 mg O3/g DS.

The efficacies of UV photolysis, UV-activated persulfate (UV/PS), and combined UV/Fe2+-activated persulfate (UV/PS/Fe2+) systems for degrading of different organic micropollutants in ultrapure water and groundwater were examined and compared. The studied micropollutants belonging to the different classes involved an artificial sweetener acesulfame K (ACE), beta-lactam antibiotic amoxicillin (AMX),

Chlorinated water from River Ganga is the main source of drinking water in Kanpur, India. But, this water contains a significant amount of disinfection by-products (DBPs) that include haloacetic acids (HAAs) as a major contributor, which pose a carcinogenic risk on long-term ingestion. Therefore, in order to control HAAs formation, different combinations of ozonation and bio-activated carbon filtration

In this study, the efficiency of gaseous ozone (O3) injected in the soil as an oxidizing agent for the inactivation of F. oxysporum was evaluated under laboratory conditions. The results show the treatment reached an inactivation efficiency of 76% after an applied dose of 0.40 g O3 kg −1 soil. This shows that the injection of O3 can be a viable alternative to control pathogenic organisms in the soils

The present study aimed to evaluate the antimicrobial effect of gaseous ozone against specific oral pathogens on denture base resins. 1080 round samples were prepared (10mm-diameter, 2mm-thickness). Candida albicans, Streptococcus mutans, Streptococcus gordonii, and Aggregatibacter actinomycetemcomitans, polyamide-Deflex, heat-cured polymethyl-methacrylate (PMMA)-QC-20, and cold-cured-PMMA-Meliodent

The reduction of microbial contamination in dental unit waterlines (DUWLs) appears to be necessary because of a potential risk of infections in immunocompromised patients and medical staff, which are regularly exposed to water and aerosols generated from DUWLs. In the present study, the qualitative and quantitative microbial contamination of water in DUWLs were determined and the conventional biomedical

This article presents the results of the statistical modeling of the ground-level ozone concentration in the air in the close vicinity of the city of Zrenjanin (Serbia). This study is aimed at defining the dependence of ozone concentration on the following predictors: SO2, CO, H2S, NO, NO2, NOx, PM10, benzene, toluene, m,p-Xylene, o-Xylene and ethylbenzene concentration in the air, as well as on the

Yam (Dioscorea spp.) is an important food source for a large part of the population in tropical regions. However, yam is susceptible to a range of serious and debilitating diseases including viruses. The application of water-dissolved ozone (1.5 ppm for 10 min) allowed to get potyvirus-free in vitro yam plants, with an efficiency rate statistically similar to the electrotherapy (63.5% and 62.5%, respectively)

The effects of ozone treatment (1 × 10−2 kg m−3, for up to 8 h) on quality parameters of turkey meat were investigated. Ozone was effective in inactivating microorganisms. Approximately 2.9, 2.3 and 1.9 log reductions were achieved in the counts of total aerobic mesophilic bacteria, Enterobacteriaceae and yeast-mold, respectively. Ozone caused significant changes in carbonyl contents, thiobarbituric

In this study, ozonation is coupled with other approaches for the degradation of tetramethylammonium hydroxide (TMAH) to increase the degradation efficiency and reduce the toxicity. A degradation of 70.9% was reached after the reaction of TMAH with ozone for 120 min at pH 11 with the ozone dosage of 16 g O3 per gram TMAH per hour (16 g O3 g−1 TMAH h−1). A mineralization of 47.6% was achieved and the

Root-knot nematodes (Meloidogyne incognita) are plant parasitic worms that widely influence the agricultural production including soilless cultivation. In this study, we investigated the inactivating effect of ozonated nutrient solution on the root-knot nematode juveniles in both nutrient solution and substrate, as well as the in vitro egg hatching. The results showed that twice ozonation treatments

(2019). What’s New in Ozone? Ozone: Science & Engineering: Vol. 41, No. 6, pp. 489-489.

(2019). Upcoming IOA Meetings. Ozone: Science & Engineering: Vol. 41, No. 6, pp. 490-490.

Ozone processing is one of the encouraging non-thermal and bio-friendly techniques in the food processing sector. The applicability of ozone technology in food industry is increasing due to its antimicrobial action and modification of functional properties of the foods. The structural modifications of starches have major applications in the food and bakery industry for producing products with increased

Anaerobic side-stream reactors (ASSR) have been suggested to reduce waste activated sludge volumes benefiting from relatively low capital/operation costs and design simplicity. In this study, an evaluation of the feasibility of combining the ASSR system with the lysis-cryptic growth (ozonation) process was made so that a part of the sludge which passed through the ASSR anaerobic tank would be then

γ-Al2O3 was incorporated with SiO2 and used as carrier to support Ni and Cu oxides for catalytic ozonation of heavy oil produced water. The change of catalytic activity was in accordance with that of surface hydroxyl density after incorporation or reuse of catalysts. Nitrogen adsorption and X-ray power diffraction analysis indicated that the specific surface area decreased and the mineral phase and

As an effective alternative to traditional pesticides, ozonated water has been used for direct immersion and spraying applications, respectively, against the pathogenic bacterium Ralstonia solanacearum (R. solanacearum) and fungus Alternaria solani (A. solani) that are pathogens of tomato. Immersing R. solanacearum in 0.8 mg/L ozonated water resulted in complete inactivation, while the growth-inhibition

Graphite felt supported magnesium oxide (MgO/GF) catalyst was prepared by the equal volume impregnation method. Bisphenol A (BPA) was chosen as the target contaminant to be degraded by different ozone-based processes. The results of X-ray powder diffraction/scanning electron microscopy showed that MgO was uniformly loaded on graphite felt. The results showed that the removal percentages of BPA and

In this study, the ozonolysis of real anaerobically digested distillery wastewater (DWW) was carried out. The effect of operating parameters, such as pH, initial concentration, and ozone dosage, on the efficiency of ozone utilization, color removal, and sludge solubilization was studied. The highest ozone utilization of 99% was observed at the highest initial concentration (COD of 3000 mg/L) and lowest

While raw seed sprouts can threaten consumers’ health by foodborne pathogens, thermal or chemical disinfection of sprouts may cause some negative effects; instead, ozone can be a good alternative treatment. This study investigated the effect of nine ozone treatments (2000, 4000, and 6000 ppm within 1, 2, and 4 h) on wheat germ chemical compositions and microbial flora. The results indicated that ozonation

Although the use of ozone therapy in dentistry has become widespread, the number of controlled clinical trials evaluating its effectiveness in periodontal therapy is limited. The aim of this study was to evaluate the efficacy of ozone treatment, that is used in concert with scaling and root planning (SRP), on clinical periodontal parameters and to analyze its effect on cytokine levels of GCF in aggressive

The current study presents the treatment of water contaminated with the dye Direct Red 28 in the presence of Na2SO4 at three different concentrations (10, 40 and 80 g/L) by simple ozonation. This wastewater treatment was considered in a wastewater recycling process. At the end of each ozonation cycle, ozonation dynamics, ozone consumption, pH, electrical conductivity and UV/Vis spectra variation were

Quality changes in commercial-sized Nile tilapia fillets sterilized by 4.0 mg/L ozonated water for 30-min and stored in ice for 18 days were evaluated. Malondialdehyde content increased from 1.54 ± 0.06 to 1.94 ± 0.14 nmol/mgprot after treatment at day 18, while drip loss rate, lightness, chroma, whiteness index and whilst hue values in the treated group were significantly higher (P < .05). These changes

p-nitroaniline (PNA) is a common contaminant in the petrochemical industry wastewater, which is resulted from the production of pesticides, dyes and glues. In this research, PNA degradation was investigated by ozonation (O3) with ultraviolet radiation (O3/UV) in the aqueous solution. Moreover, the effective parameters such as initial concentration of PNA, input supply rate of ozone, contact times and

The native microflora survival and quality retention of fresh-cut onions treated by ozonated water (OW) with ozone concentration of 1.4 mg L−1, for 1, 3, and 5 min during storage at 4°C for 14 days were investigated. The pesticide residue removal effect of OW treatment for 5 min was also determined. The results show that all OW treatments significantly inhibited the growth of aerobic bacteria, coliforms

In order to improve the mass transfer efficiency of ozone in water, stainless steel wire mesh (SSWM) corrugated structure was packed into a microbubble ozone reactor to enhance the mass transfer efficiency. The results showed that the SSWM/O3 system could effectively improve the mass transfer efficiency. When the concentration of ozone in the liquid phase reached a stable state, it was about 21 mg/L