ABSTRACT An advanced technique for the utilization of the dissolved Br in concentrated seawaters discharged from the salt manufacturers in Japan can enable the development of a comprehensive utilization system for seawater resources. Hypobromous acid (HOBr) and hypobromite ion (BrO–) obtained by the oxidative reaction of Br– degrade the many organic compounds and can be utilized as water purification

ABSTRACT Post-harvest fungal diseases, such as anthracnose, are common causes of spoilage in papaya fruits, accounting for considerable economic losses. The use of ozone gas is an alternative to tackle this problem, as it is a strong oxidizing and antimicrobial agent. Thus, the objective of the present work was to evaluate the efficiency of ozonized water for controlling anthracnose in papayas. It

ABSTRACT Coronavirus is a virus with an external protective membrane known as pericapsid and composed essentially by a double layer of phospholipids (PPL) and other components. The destabilization or the decomposition of this pericapsid means the certain inactivation of the coronavirus. The purpose of this work is to show that ozone is able to oxidize easily the phospholipids destabilizing the micellar

ABSTRACT The antibacterial efficacy of ozonated sunflower oil against Enterococcus faecalis biofilm was evaluated comparing to gaseous ozone. Sixty disks of composite resin were distributed in sterile microtubes containing bacterial suspension of an antibiotic-resistant E. faecalis isolated from endodontic infection. After incubation for 24 hours at 37°C, six protocols were conducted (n = 10): group

ABSTRACT Due to the recent outbreak of COVID-19, the problem of protecting the individual against airborne transmission has become of great importance. This transmission occurs when virus-containing droplets enter the respiratory tract. Accordingly, the inactivation of airborne viruses plays significant role in mitigating the threat posed by a human-to-human infectious disease. The use of gas-based

ABSTRACT This study aimed to compare the antibacterial effect of ozonated water and ozonated gas at different concentrations and exposure times. Staphylococcus aureus and Enterococcus faecalis were exposed to ozonated water or ozonated gas at concentrations of 20, 40 and 60 μg/mL for 1 and 2 minutes. A positive control with bacteria and a chlorhexidine 2% negative control were used. The number of colony-forming

In this study, we investigated the degradation of linear alkylbenzene sulfonate (LAS) by an ultraviolet/hydrogen peroxide (UV/H2O2) process. In a collimated beam experiment with UV light of wavelength 222 or 254 nm, faster LAS degradation rates occurred at elevated H2O2 concentrations. The degradation behavior varied with the wavelength of the light source. Furthermore, according to the results of

Many studies have analyzed the performance of ozone generation systems to achieve the maximum ozone concentration with the lowest possible energy consumption. This study conducted an experimental analysis of a cylindrical ozone generator with a discharge gap reduced to 0.5 mm and a partitioned high-voltage electrode composed of three copper foil strips. The proposed model was compared with a similar

The effects of intermittent ozone treatment on the storage quality and life of pomegranate were investigated. Fruit were exposed to 0.5 ppm gaseous ozone for 30 minutes initially and during cold storage at 1-month intervals. Control group was exposed to only air under same condition. Packaged fruit were stored at 6°C and 90 ± 5% relative humidity for 4 months. Ozone treatment suppressed respiration

(2020). Editorial. Ozone: Science & Engineering: Vol. 42, No. 5, pp. 377-377.

Currently, no medicine has demonstrated efficacy in treating the ongoing pandemic COVID-19 caused by SARS-CoV-2 virus. Being a potent oxidant, ozone is lethal against most bacteria and viruses found in water, or on surfaces and aerosols. Ozone has also been successfully used to treat several viral diseases such as Ebola and HIV Hepatitis B and C. Using molecular modeling, this study evaluated the reactivity

The removal of cyanotoxins, microcystin-LR (MLR), anatoxin-a (ANA), and cylindrospermopsin (CYN) in Detroit River water (DRW) was investigated by ozone and advanced oxidation process (AOP). Enhanced removal of all cyanotoxins was observed with increasing applied ozone dose. The reactivity of cyanotoxins with ozone followed the order of MLR>CYN>ANA in DRW at its natural pH of 7.6, as indicated by the

The present work aimed to evaluate the decomposition kinetics of ozone in aqueous media with Brazil nuts. It also intended to investigate the potential of ozonation for inactivating Aspergillus flavus, and to determine changes in nut color and crude oil lipid profile. To do so, an inlet ozone concentration of 13.0 mg L−1, at a flow rate of 1 L min−1 and 25°C, was adopted. For the ozonation process

The increase in nickel and cobalt consumption encourages the exploration of different resources. Limonite ore exploration is carried out through the hydrometallurgical route. After nickel and cobalt separation, the remaining solution contains manganese to be recovered. The present study aimed at the kinetic modeling of manganese precipitation by ozonation. The experiments were carried out in a 250

Color fading through ozonation has been previously studied by our and other labs. Although great progress has been achieved in this field, studies for the optimization of the operating process of the ozone water washing process and fabric-touch tests are important for the practical application in industry. An industrial-scale G2 ozone washing machine was used for the color fading of the samples. Since

Streptococcus mutans is one of the principal pathogens of the human oral habitat, being one of the principal etiological agents of carious lesions. Ozone is a powerful oxidant, it has the ability to inactivate microorganisms in general, and ultrasound is an acoustic system generated through a piezoelectric crystal that also presents microbicidal effects. In the present study, a comparative analysis

A study was carried out to evaluate the effect of elevated tropospheric ozone concentration on 15 rice cultivars. The cultivars were exposed to a weighted average ozone concentration of 51 ppb ±10% (10:00–17:00 h) for 30 days on its reproductive stage. On an average, elevated ozone significantly affects photosynthetic rate (−19.23%), stomatal conductance (−21.35%) and the contents of chlorophyll (−27

This study performed a long-term characterization of medical laboratory wastewaters (MLWs) arising from diagnosis and examination units. The results indicated that the MLWs may be assessed as strong domestic wastewater and also have highly toxic properties. Furthermore, statistical optimization of toxicity removal through ozonation was investigated using the central composite design. COD, BOD5, AOX

An advanced oxidation system based on ozone, activated carbon and Portland cement was evaluated for the removal of the beta-lactam antibiotic Meropenem (emerging contaminant, EC). This system was validated with synthetic wastewater with characteristics similar to those of hospital wastewater. The total elimination of the antibiotic and a 90% reduction in the initial chemical oxygen demand (COD) associated

Smoke taint is becoming a worldwide problem for wine production because of the increasing number of fires in wine regions. It is the result of volatile phenols released by fire smoke which bind to berry sugars, translocate mainly through bunch stem and/or through berry skin. The techniques used to remove smoke taint from wine can modify wine quality provided that smoke taint is completely removed from

Metal–organic frameworks (MOFs), as a relatively new class of crystalline porous materials with large surface area and ultrahigh porosity, are extensively used in heterogeneous catalysts. In this study, the efficiency of heterogeneous catalytic ozonation process (COP) with a new nickel nanoparticle-based catalyst in highly porous carbon derived from nickel-MOF was investigated for Linear Alkyl benzene

The ozone reactive flotation for deinking recovered cellulosic fibers, recently developed at lab scale, showed interesting results in terms of fiber yield and effluent pollution reduction with classical recovered fibers furnishes made of old magazines and old newspapers. However, deinked pulp yellowing occurred. To further develop the ozone-based deinking process, a deeper investigation was conducted

The process of catalytic ozonation shows promise for the degradation of refractory contaminants. A doped MnO2/Al2O3 catalyst was prepared and utilized to achieve catalytic microbubbles ozonation for quinoline degradation. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) analysis show that the active component, MnO2 (spherical, approximately 30–50 nm in diameter) dispersed well in the

(2020). Ozone and the Coronavirus. Ozone: Science & Engineering: Vol. 42, No. 4, pp. 293-293.

Ozone penetrating from outdoors may cause indoor secondary pollution. The role and mechanism of heat treatment in improving the catalytic activity for ozone decomposition are not very clear. Here we investigated the effect of heat treatment (200–500 °C) in three different atmospheres, i.e., air, helium, and hydrogen on a tungsten-doped MnO2 catalyst (W-MnO2). The possible changes of crystal structure

The occurrence of acesulfame (ACE) in two full-scale drinking water treatment plants (DWTPs) in Zhejiang Province, China, was investigated. The results showed that ACE was commonly detected in the raw water of the DWTPs at ND–0.125 and ND–0.093 μg/L, respectively. The maximum ACE removal efficiencies in the DWTP with traditional processes were less than 10%, whereas those in the DWTP with advanced

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.