ozonation Articles
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Catalytic ozonation of
p -chloronitrobenzene over pumice-supported zinc oxyhydroxideThe catalytic ozonation of p-chloronitrobenzene (pCNB) in an aqueous solution using pumice-supported zinc oxyhydroxide (ZMP) as the catalyst was investigated. ZMP significantly enhanced the degradation efficiency in the heterogeneous catalytic ozonation compared with ozonation alone. The decomposition rate of the aqueous ozone increased 2.84-fold in the presence of ZMP. Catalytic ozone ...
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Ozonation catalyzed by iron silicate for the degradation of
o -chloronitrobenzene in drinking waterThis paper aimed to reveal the effectiveness and the mechanism of catalytic ozonation in the presence of iron silicate for the degradation of o-chloronitrobenzene (oCNB). Experimental results show that catalytic ozonation in the presence of iron silicate could substantially enhance oCNB removal efficiency compared with ozonation alone, and that the adsorption of oCNB on the iron silicate surface ...
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Evaluation of manganese peroxidase (MnP) for its ability to resist the ozonization and thereafter decolorize methyl orange
The goal of this study was to determine whether ozone can be used to suppress bacterial growth in operating a white rot fungi reactor system. The effects of ozone dose on the activity of manganese peroxidase (MnP) and on the death rate of Escherichia coli were investigated. The results showed that at ozone dose of 0.98 mg/L the MnP activity was not affected after 40 min continuous treatment while ...
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Inactivation of surface viruses by gaseous ozone
Environmental surfaces may be contaminated with viruses and contribute to their transmission. Concerns have arisen in trying to control viruses because of an increasing incidence of viral infections. Ozone is considered to be a promising method to inactivate viruses on surfaces. In this investigation, the effects of ozone concentration, contact time, different capsid architecture of viruses, and ...
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Ozonation for the removal of bisphenol A
The mechanism of byproduct formation and oxidation pathway of bisphenol A (BPA) during ozonation process have been compared under acidic, neutral and alkaline conditions at an applied ozone dose of 5.3 mg·L−1 min−1. Alkaline conditions promoted the fastest removal and the pseudo first-order reaction rate constant was calculated as 0.15 min−1. Complete removal under alkaline conditions (after ...
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Catalytic ozonation of aqueous phenol over metal-loaded HZSM-5
The performances of HZSM-5 and transition metal-loaded HZSM-5 (Mn, Cu, Fe, Ti) catalysts during catalytic ozonation of phenol have been investigated. It was observed the performance order for removal of phenol and COD was Mn/HZSM-5>Fe/HZSM-5>Cu/HZSM-5>Ti/HZSM-5>HZSM-5. The presence of metals on HZSM-5 enhanced the phenol removal capability of HZSM-5. Mn loading on HZSM-5 was optimized due to its ...
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The process of activated sludge ozonation: effect of ozone on cells, flocs, macromolecules and nutrient release
The purpose of this research is to investigate the activated sludge ozonation process. Results revealed that bacteria destruction and cell solubilization were not obvious when ozone dose was lower than 11 mgO3/gMLSS (MLSS: mixed liquor suspended solids), while pores appeared on the sludge and bacterial disappeared from floc surface. In the range of 11–90 mgO3/gMLSS, ozone had significant ...
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Correlation and prediction of azo dye degradation by nonlinear least-square regression in combined ozonation and ultrasonolysis processes
Correlative reaction kinetics based on nonlinear least square regression were obtained to predict the degradation of p-aminophenol (PAP), C.I. Reactive Yellow 84 (RY84), C.I. Reactive Blue 19 (RB19), and C.I. Direct Red 23 (DR23) in combined ultrasonolysis and ozonation. Effects of ultrasonolysis and ozonation as individual processes, as well as the synergetic effect for the degradation of azo ...
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Options and limitations of hydrogen peroxide addition to enhance radical formation during ozonation of secondary effluents
The oxidation of secondary effluent with ozone and O3/H2O2 (peroxone) was evaluated in batch experiments as pre-treatment for soil aquifer treatment for non-potable reuse purposes. The addition of hydrogen peroxide improved the reduction of ozone-resistant compounds with an optimized radical formation at 0.5 mol H2O2/mol O3. However, the improvement of radical formation was shown to be limited ...
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Formation of aldehyde during ozonation of taste and odour compounds in water
This study was conducted to investigate ketoaldehydes as another form of taste and odour (T&O) compound generated during the ozonation of commonly known T&O compounds, such as 2-methylisoborneol (MIB) and 2,4,6-trichloroanisole (TCA), which are typical T&O compounds. The ketoaldehydes generated during the ozonation process of T&O were studied. Results revealed that ...
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Evaluation of the chemistry transport model system KAMM/DRAIS, based on daytime ground-level ozone data
The main objective of this study was to estimate the reliability of the chemistry transport model KAMM/DRAIS to predict increased ozone concentrations near ground level. The evaluation was carried out on the basis of the ozone measurements collected during episodes of the TRACT, FLUMOB, and BERLIOZ experiments. The ozone data of all episodes have been evaluated for the time period between 10 UTC ...
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Catalytic activity of aluminum silicate for ozonation of chloronitrobenzenes in aqueous solution
Chemical oxidation using ozone with appropriate catalysts offers an attractive option for removing inhibitory and toxic pollutants in micro-polluted water. This work investigated the catalytic ozonation of three chloronitrobenzenes (CNBs, i.e. p-CNB, o-CNB, and m-CNB) in the presence of a novel and efficient synthesized aluminum silicate catalyst. Experiments were carried out with focus on the ...
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EPA’S 2010 proposed ozone NAAQS, presented at EUEC 2010
Ozone NAAQS Overview Background –Why are revisions already being proposed to the March 2008 Ozone NAAQS? What are the proposed new ozone NAAQS? Expected Timeline Impacts Recent Ozone Standard Revisions Less than 2 years ago (March 12, 2008)EPA revised the 8-hour ozone standard Primary and secondary standard: 0.075 ppm Litigation Ensued American Lung Association v. ...
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Ground–level ozone prediction using a neural network model based on meteorological variables and appiled to the metropolitan area of São Paulo
A neural network model to predict ozone concentration in the São Paulo Metropolitan Area was developed, based on average values of meteorological variables in the morning (8:00–12:00 hr) and afternoon (13:00–17:00 hr) periods. Outputs are the maximum and average ozone concentrations in the afternoon (12:00–17:00 hr). The correlation coefficient between computed and measured values was 0.82 and ...
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SMOGSTOP: A new way of forecasting ozone concentrations at ground level
Every summer, ground-level ozone concentrations rise in Belgium and cause episodes of photochemical summer smog. This phenomenon is the cause of well-recognised public health distress, especially for people suffering from respiratory diseases. In order to warn groups of sensitive people of forthcoming smog episodes, VITO (the Flemish Institute for Technological Research) and VMM (the Flemish ...
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The degradation of diethyl phthalate (DEP) during ozonation: oxidation by-products study
The degradation of diethyl phthalate (DEP) in an aqueous solution during ozonation was investigated by identifying the oxidation intermediates using GC–MS. The experiments were carried out in semi-batch mode with a 1.5 mg l-1-min ozone dose. The proposed degradation pathways were divided into hydrolysis of the aliphatic chain (pathway (A)) and hydroxylation resulting from ∙OH attack in the ...
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What is important when selecting an ozone generator for your ALD
Some time ago, a Semiconductor manufacturer approached us with a concern. They explained that their current ozone generator was not sufficient for effectively treating their substrate, resulting in a lengthy process and that they require a larger ozone generator. At Absolute Ozone®, we provide free and unlimited support to all our clients for their applications so to better understand the ...
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Ozone–dioxane delignification from the cell walls of Japanese cypress (Chamaecyparis obtusa Endl.)
Delignification from the cell walls with a combination of ozone oxidation and dioxane–water extraction using thin sections of a softwood, Japanese cypress (Chamaecyparis obtusa Endl.), was studied to determine its suitability for the production of recyclable cellulose-based materials from wood waste. The visible-light absorption spectra of treated wood sections revealed that delignification from ...
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Absorption and decomposition of ozone in a three-phase split-rectangular airlift reactor under ultrasonic irradiation
Ozone absorption was investigated in a three-phase split-rectangular airlift reactor under ultrasonic irradiation using γ-Al2O3 as catalyst. The reactor consisted of a square column (50 × 50 mm) with the height of 120 mm, divided into a riser and a downcomer by a baffle, 50 mm in width, 4 mm in thickness and 50 mm in total height. An absorption kinetic model was proposed to determine the ...
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Innovation by disaster: the ozone catastrophe as experiment of forced innovation
In this paper, the process of adapting and replacing products and processes by new alternatives will be analysed. The paper will reflect upon effective means of stimulating environmental innovation by analysing the innovations that resulted from the ban on CFCs. The ozone hole catastrophe has been announced in two steps: first there was the land breaking paper of Rowland and Molina of 1974, which ...
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