ABSTRACT Treatment of the textile effluent becomes complex due to the high color, organic load, dissolved solids content, and toxicity of the textile effluents. An optimized pre-ozonation treatment has been proposed, aimed at the maximum color and organics removal leading to possible resource recovery at the field-scale. The standalone ozonation at optimum conditions of pH, salinity, and dye concentration

ABSTRACT The present work aimed at the effectiveness of ozonated water in the control of Listeria monocytogenes, adopting different combinations of pH, contact time, and storage time under refrigeration. To obtain ozonated water, the dose applied was 21 mg L−1 min−1, for 15 min. Samples of 1.0 L of water were ozonated at the inlet ozone concentration of 21 mg L−1 and a flow rate of 1.0 L min−1. The

ABSTRACT Pit and fissure sealants (PFSs) are the optimal treatment options to prevent occlusal caries. The aim of this in-vitro study was to evaluate the effect of ozone pretreatment on dental PFS retention when applied before or after acid etching. The retention of the PFSs was tested by microtensile bond strength test, scanning electron microscope (SEM) analysis, and microleakage evaluation. The

ABSTRACT Nanoscale composite metal oxide of Ag-La-Co was prepared by co-precipitation method for the treatment of Reactive Black 5 using catalytic ozonation process. Further, the catalyst was characterized by transmission electron microscope, X-ray powder diffraction (XRD), scanning electron microscope - energy dispersive X-ray (SEM-EDX) and Brunauer–Emmett–Teller (BET) surface area analyzer for clarity

ABSTRACT The present status of antimicrobial-resistant bacteria (AMRB) and antimicrobial-susceptible bacteria (AMSB) in hospital effluent, sewage treatment plant (STP) influent, STP secondary effluent, STP effluent (chlorination), STP effluent (ozonation), and river water were analyzed in an urban river in Japan by a 2-year monitoring survey. The results revealed the existence of multiple AMRB grouped

ABSTRACT The aim of this study is to examine the effect of chlorhexidine (CHX), ozone and photodynamic (PDT) therapy on the microleakage of reinforced glass ionomer cement and on tooth discoloration. The class V cavities were opened on the buccal faces of 96 extracted molar teeth and the samples were divided into four groups (n = 24). Before and after cavity disinfection, color measurement of teeth

ABSTRACT This study aimed to conduct an ozone application within a triage area that receives patients with suspected cases of COVID-19. The ozone application was carried out for 10 min to disinfect the air and surfaces of different rooms within the triage area. A 3D model for ozone spread in the doctor’s office was developed. Higher counts of bacteria (3.3 × 102 CFU · m−3) and fungi (1.3 × 103 CFU

(2021). Editorial. Ozone: Science & Engineering: Vol. 43, No. 2, pp. 107-107.

ABSTRACT Biological wastewater treatment plants (WWTPs) produce large amounts of excess sludge. One approach to reduce sludge is treatment with ozone, which promotes sludge disintegration and solubilization. Here we report the first application of ultra-fine- and micro-bubble (UFB/MB) ozonation to sludge reduction in a full-scale WWTP. UFB/MB ozonation using a spiral liquid-type UFB generator was applied

ABSTRACT Ozone is a highly effective oxidant. In its gaseous form, ozone is not a stable compound; however, stability and effectiveness are sustained for a long period, when stored in vegetable oils. In this study, solutions are prepared containing a combination of ozone nanobubbles, vegetable oils and emulsifiers. Throughout the study, the antibacterial effectiveness and stability of ozone nanobubble

ABSTRACT The increased cases of food-borne outbreaks associated with microbial contamination of fresh-cut fruits and vegetables have underlined the importance of safe and effective sanitizing agents in the food industry. This study was conducted to comparatively evaluate the sanitizing effects of optimized aqueous ozone conditions (5 ppm dissolved ozone for an exposure time of 8 min and aqueous pH

ABSTRACT Ozone is a powerful disinfectant and holds great potential to decontaminate grains from microbial spoilage, toxins, pest, and insects, leaving no harmful residues after treatment. The objective of the present article is to systematically review the potential of ozone to modify the flour properties favoring the processing and improving the quality of the final products. Influence of ozone treatment

ABSTRACT Ibuprofen (IBU) and diclofenac (DCF) are non-steroidal anti-inflammatory pharmaceuticals. They are frequently detected in wastewater and in the environment. Due to their harmful effect on aquatic organisms, new methods should be developed to enhance their removal from wastewater. One efficient wastewater treatment process is ozonation. In this study the fate of IBU and DCF during ozonation

ABSTRACT The removal of phenol compounds (such as phenol (Ph), 4-chlorophenol (4-CPh), and 4-phenolsulfonic acid (4-APS)) was studied using catalytic ozonation and cerium oxide (CeO2) as the catalyst. Conventional ozonation removes 40% and 30% of total organic carbon (TOC) for 4-CPh and 4-APS, respectively. The presence of the catalyst doubled the TOC removal in comparison with ozone alone. Chloride

ABSTRACT Organic micropollutants (OMPs) have been widely detected in the aqueous environment and their effect on the environment and human health has been studied. The removal of OMPs from effluents of a conventional urban wastewater treatment plant by ozonation as well as photo-enhancement of ozonation using UVA-LED panels and photolysis in the presence and absence of hydrogen peroxide was investigated

ABSTRACT Ozonation for micropollutant removal from wastewater treatment plant effluent is energy and cost-intensive because of competition between background organic matter and micropollutants. This study aims to elucidate the interference of different organic matter fractions during the ozonation of micropollutants. Wastewater treatment plant effluent was fractionated using membranes and XAD-8 resin

ABSTRACT The aim of this study is the determination of antimicrobial activity at different concentrations of ozonized olive oil of Olea europea L. against eight bacteria (Staphylococcus aureus ATCC 6538, Bacillus subtilis ATCC 9372, Listeria monocytogenes ATCC 15313, Pseudomonas aeruginosa ATCC 27853, Proteus mirabilis ATCC 35659, Escherichia coli ATCC 25922, Klebsiella pneumonia ATCC 4352, Salmonella

ABSTRACT The effect of ozonated water on quality and peel microbial load reduction of Nocellara Etnea (NE) olives was evaluated. Different ozone concentrations in water and different time of contact were tested. Moreover, two different ozonated water washing methods, dipping, and continuous shower, were compared. Color, texture, chemical, and microbiological analyses were performed before and after

ABSTRACT The aim of this investigation was to evaluate the modification of physicochemical properties (viscosity and density) of four vegetable oils (grapeseed, sunflower, avocado, and olive) during ozonation, and to relate such variation with the ozonation kinetics, the ozonation degree, and the ozonation by-products distribution. During ozonation, the monitorization of the double bonds’ decomposition

ABSTRACT Development of an efficient conversion technique of O3 to active oxygen species (OS) with high oxidation potential under weakly acidic conditions is described herein. This technique involves the generation of HO2 – as an initiator of the radical chain reaction by the addition of H2O2 or/and UV irradiation into aqueous solution during O3 fine bubble injection. Minimizing the O3 bubble diameter

ABSTRACT The disinfection efficiency of ozonation by ozonated water on human norovirus genogroup-II (HNoV-II) and MS2 as a surrogate was investigated using plaque assay and/or quantitative PCR (qPCR). The qPCR combining propidium monoazide (PMA) pretreatment was used to evaluate the damage to the viral capsids, which showed that the PMA pretreatment could be applied to HNoV-II but not to MS2 because

ABSTRACT The primary objective of this study is to identify the aromatic intermediate products in p-cresol degradation by ozonation, peroxone, and ozone-persulfate, and elucidate the pathways and mechanisms involved in the processes. The experiments were conducted in semi-batch operating mode, where ozone was bubbled into p-cresol in a 1.0 L cylindrical jacketed glass reactor. In general, the aromatic

(2021). Editorial. Ozone: Science & Engineering: Vol. 43, No. 1, pp. 1-1.

ABSTRACT Ozone disinfection has demonstrated high efficacy against enveloped and non-enveloped viruses, including viruses similar in morphology to SARS-CoV-2. Due to this efficacy, numerous gaseous and aqueous phase ozone applications have emerged to potentially inhibit virus persistence in aerosols, surfaces, and water. This review identifies the exposure requirements for virus inactivation and important

ABSTRACT Removal of micropollutants in wastewaters has gained importance in recent years. Advanced treatment processes such as ozone oxidation, activated carbon adsorption, and membrane filtration are required to remove the micropollutants from wastewaters. In this study, extended ozonation was applied at different stages of a wastewater treatment plant (WWTP) to determine its effect on the removal

ABSTRACT SARS-CoV-2 has resulted in a global pandemic resulting in the infections of many millions and deaths of well over a million people. The ease of SARS-CoV-2 spread and the infectious nature of the virus in humans has resulted in an urgent need for effective disinfection strategies. Ozone (O3) is a promising disinfectant for SARS-CoV-2 due to its ability to overcome limitations with topical disinfection

ABSTRACT The study investigated the reactive dissolution of gas phase nitrogen-oxides and ozone in water. Mixtures with variable composition of nitrogen oxides were produced by mixing nitric oxide (NO) with ozone. Pure NO in Ar carrier gas resulted in the production of NO2 − but its production rate was limited by low NO solubility. The presence of NO2 in the gas increased the production of NO2 − while

ABSTRACT The City of White Rock acquired the water system from EPCOR in October 2015. The City of White Rock decided to build a water treatment plant to treat the City’s existing groundwater supplies to remove naturally occurring manganese and arsenic to ensure that an improved drinking water quality is supplied to City residents that meets the Canadian guidelines and esthetic objectives. The City’s

ABSTRACT Metabolites of some cyanobacteria and actinomycete species such as geosmin and 2-methylisoborneol (MIB) are generally the sources of earthy and musty odor in surface waters. Peroxone process, that is a combination of ozone (O3) and hydrogen peroxide (H2O2), has the potential to effectively remove these compounds. In this study, the removal of MIB with the peroxone process was investigated

ABSTRACT The objectives of this study were to evaluate the effect of ozone on sprouting of potato and sugarcane seeds, as well as the ozone efficacy on soft-rot control of seed potatoes and to compare ozone application with conventional treatments in cane seeds. Seed potatoes were treated applying gaseous ozone at 100, 300 and 600 mg m−3 for 45 min before storage. Sugarcane seeds were immersed in water

(2020). Editorial. Ozone: Science & Engineering: Vol. 42, No. 6, pp. 477-477.

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 Ozone (O3) is a strong oxidant, which is able to oxidize carbonaceous solid soot even at ambient temperature. In this study, we found that the ozone-induced oxidation of soot was noticeably enhanced in the range 100–150 °C when La1-x K x MnO3 (x = 0, 0.1, 0.25) was used as a catalyst. The oxidation was limited at T < 300 °C owing to the thermal instability of ozone, but during temperature-programmed

ABSTRACT The catalytic ozonation, combining ozone with solid catalysts technology, was adopted to dispose of the reverse osmosis concentrate (ROC) produced from landfill leachate. To explore an effective and economically sustainable process, three different combined processes were investigated in a microbubble reactor. The considered catalytic oxidation processes were Ca(OH)2/O3+ AC/O3, Ca(OH)2+ AC/O3

ABSTRACT Corn is a cereal of great economic and social importance worldwide. The objective of the present work was to evaluate the effects on the physiological quality and the performance in the field of corn seeds with different quality standards before and after hydropriming with ozone. To evaluate the effects on the physiological quality, two batches (one with high physiological quality and the

ABSTRACT Some polymers can both absorb dry gaseous ozone and release it efficiently. This occurs, for example, with polystyrene (PS) surfaces, which acquire biocidal properties: bacterial spores are indeed inactivated when deposited wet on polystyrene exposed to ozone. Two main features need to be examined in relation with these assertions: PS surfaces pre-exposed to dry ozone can release O3 molecules

ABSTRACT The rapid spread of SARS-CoV-2 caused a global pandemic. Due to the lack of treatment and vaccines, safety strategies must be found to stop the virus dissemination. The objective of this study was to evaluate the virucidal activity of ozonated water, a powerful oxidizing agent, against SARS-CoV-2. A special faucet was the source of ozonated water at a low concentration (0.2–0.8 ppm). At this

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 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 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

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

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

ABSTRACT 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

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

ABSTRACT 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

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