Temat: ozonation - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Photocatalytic degradation of volatile chlorinated organic compounds with ozone addition
Autorzy:: Ebrahimi, H.
Shahna, F. G.
Bahrami, A.
Jaleh, B.
Abedi, K.
Tematy:: photocatalytic oxidation
ozonation
chloroform
chlorobenzene; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/205214.pdf Link otwiera się w nowym oknie
Opis:: The decomposition of hydrocarbons using combined advanced oxidation methods is largely considered owing to abundant production of OH radicals and the potential economic advantages. In this study, the synergetic effect of ozonation on photocatalytic oxidation of chloroform and chlorobenzene over expanded graphite-TiO₂&ZnO Nano composite was investigated. The effect of introduced ozone concentration and residence time was also examined on removal efficiency. The results showed that the removal efficiency was significantly enhanced by the combined system resulting from the additional oxidation process causing active species to be increased. Increasing the introduced ozone concentration which generates more reactive compounds had a greater effect on the removal efficiency than that of residence time. However, from the mineralization point of view, the residence time had a dominant effect, and the selectivity towards CO₂ was dramatically declined when the flow rate increased. Based on these results, the combined system is preferred due to higher removal efficiency and complete mineralization.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Podczyszczanie odcieków składowiskach z wykorzystaniem ozonu
Landfill leachates pretreatment by ozonation
Autorzy:: Leszczyński, J.
Tałałaj, I.
Walery, M.
Biedka, P.
Tematy:: odcieki składowiskowe
ozonowanie
landfill leachate
ozonation; Pokaż więcej
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Powiązania:: https://bibliotekanauki.pl/articles/949973.pdf Link otwiera się w nowym oknie
Opis:: Badano zastosowanie ozonu do podczyszczania odcieków składowiskowych pochodzących z ustabilizowanego składowiska odpadów stałych. Odcieki pochodziły ze składowiska zlokalizowanego w pobliżu Bielska Podlaskiego. Wartości głównych badanych wskaźników kształtowały się na poziomie: pH 8,32; ChZT 870 mgO₂/dm³; BZT₅ 90 mgO₂/dm³; NH₄⁺. 136,2 mgN/dm³; absorbancja UV₂₅₄ 0,312, mętność 14 NTU. Zastosowano dawki ozonu od 115,5 do 808,5 mgO₃/dm³. Największą efektywność usuwania ChZT, barwy i absorbancji UV₂₅₄ wynosiła odpowiednio 37,3%; 81,6% and 59,2% przy zastosowaniu najwyższej dawki ozonu 808,5 mgO₃/dm³. Po ozonowaniu zaobserwowano wzrost proporcji BZT₅/ChZT z 0,1 do 0,23.
In this paper, the application of ozonation processes for stabilized landfill leachate treatment was investigated. The leachate came from a municipal sanitary landfill located nearby Bielsk Podlaski. The average values of its main parameters were: pH 8.32; COD 870 mgO₂/dm³; BOD 90 mgO₂/dm³; NH₄⁺ 136.2 mgN/dm³; UV₂₅₄ absorbance 0.312 and turbidity 14 NTU. The ozone dosages used were in the range of 115.5 to 808.5 mgO₃/dm³ of the leachate. The maximum COD, color and UV₂₅₄ absorbance removal was respectively 37.3%; 81.6% and 59.2% by applying a high ozone dose of 808.5 mgO₃/dm³. After oxidation, the ratio of BOD/COD was increased from 0.1 up to 0.23.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Toxicity Assessment of Tanning Effluents Treated via Electrocoagulation and Ozonation Using a Bioassay with Lactuca sativa L.
Autorzy:: Aguilar-Ascón, Edwar
Marrufo-Saldaña, Liliana
Barra-Hinojosa, Julio Alexis
Tematy:: electrocoagulation
toxicity
ozonation
Lactuca sativa L.; Pokaż więcej
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Powiązania:: https://bibliotekanauki.pl/articles/59114333.pdf Link otwiera się w nowym oknie
Opis:: In this study, the aim is to assess the toxicity of tannery wastewater treated with electrocoagulation and ozonation to determine the suitability of the approach for application, while maintaining the environmental quality of receiving water bodies and/or sewer systems. For this, an electrocoagulation reactor and an ozonation tank were built considering current intensity (I), treatment time (T), and ozone concentration O3 as operating factors. Acute toxicity tests were conducted using Lactuca sativa L. lettuce seeds for the raw sample (MI), sample treated with electrocoagulation (EC), and sample treated with EC and ozonation (EC+OZ). The toxicity parameters assessed in this study were the absolute germination (AG), germination index (GI), and average inhibition concentration (EC50). The electrocoagulation reactor achieved 92% removal efficiency for total suspended solid (TSS) and 10% removal efficiency for chemical oxygen demand (COD) with a current intensity of 7A and a treatment time of 30 min. In addition, the COD was further reduced in the ozonation tank by 18% with an ozone dosage of 10 g/h and a contact time of 30 min. Despite these treatments, EC50 values indicated acute toxicity in all three samples. The ANOVA analysis (p value of 0.05) revealed no significant differences between the GI values for the three samples, suggesting that toxicity did not decrease substantially, despite treatment. This is attributed to the incomplete removal of the pollutant load, expressed as COD, and formation of recalcitrant and toxic compounds during treatment processes. This work demonstrates the importance of including the “toxicity” variable in the assessment of treatments to conduct them in an integral way and preserve the environmental quality of receiving water bodies.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Chemical pretreatment of formaldehyde wastewater by selected Advanced Oxidation Processes (AOPs)
Autorzy:: Kowalik, P.
Tematy:: advanced oxidation processes
catalytic ozonation
Fenton process; Pokaż więcej
Wydawca:: Fundacja na Rzecz Młodych Naukowców
Powiązania:: https://bibliotekanauki.pl/articles/115614.pdf Link otwiera się w nowym oknie
Opis:: Chemical oxidation processes: Fenton process and catalytic ozonation with Mn2+ ions were investigated for effectiveness of formaldehyde (FA) oxidation. The influence of operational variables — O3, H2O2, Mn2+ and Fe2+ concentrations and reaction time were investigated. Researches were carried out on aqueous solution of FA, which concentration was 500 mg/l. Fenton process was investigated at pH 3 and catalytic ozonation at pH 7, 10 and 12. Results revealed that Fenton process was much more effective in FA degradation than catalytic ozonation with Mn2+ as a catalyst. The optimal H2O2/Fe2+ dosage for a Fenton process was 2000/1000 mg/l. COD and FA concentrations were reduced 59,6% and 79,5%. In case of catalytic ozonation with Mn2+ the eff ectiveness was much less and it was the biggest at pH 12 and Mn2+ dosage 25 mg/l where COD and FA concentration were reduced 14% and 38%. Therefore, Fenton process can be promising technology for FA wastewater pretreatment.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Effectiveness of ozonation in decomposition of clofibric acid and bisphenol a in model water solutions
Skuteczność ozonowania w rozkładzie kwasu klofibrowego i bisfenolu A w modelowych roztworach wodnych
Autorzy:: Zacharska, E.
Odrzywolski, A.
Depta, M.
Ozonek, J.
Tematy:: związki PPCP
ozonowanie
PPCPs
clofibric acid
ozonation; Pokaż więcej
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Powiązania:: https://bibliotekanauki.pl/articles/396007.pdf Link otwiera się w nowym oknie
Opis:: The article contains a brief characteristic of the compounds counted among PPCPs (Pharmaceuticals and Personal Care Products) and EDCs (Endocrine Disrupting Compounds) along with the presentation of their removal methods used in typical WWTPs (Wastewater Treatment Plants), WTPs (Water Treatment Plants) as well as different methods examined in laboratory conditions. The article also shows the results of the tests on decomposition of the selected compounds (clofibric acid, bisphenol A) in model water solutions with the use of advanced oxidation technique - ozonation. The compounds were selected because of their commonness and large volume of production. The main purpose of the research is to design an appropriate equipment generating ozone that could be used in a technical scale. The mechanisms of the compounds migration as well as their sources in the environment are described in the article. Further studies concerning identification of the by products of these compounds decomposition as well as recognition of the precise mechanisms occurring during different methods application need to be examined in the future.
Artykuł zawiera krótką charakterystykę związków zaliczanych do grupy PPCP (Farmaceutyki i produkty pielęgnacyjne) i EDC (związki endokrynnie czynne) wraz z przedstawieniem metod ich usuwania stosowanych w typowych zakładach oczyszczalni ścieków, stacjach uzdatniania wody jak również opisem innych metod analizowanych w warunkach laboratoryjnych. Artykuł przedstawia także wyniki badań rozkładu wybranych związków (kwas klofibrowy, bisfenol A) w modelowych roztworach wodnych przy użyciu zaawansowanej techniki utleniania - ozonowania. O wyborze związków do badań zadecydowała głównie ich powszechność występowania oraz znaczna produkcja. Głównym celem badań jest zaprojektowanie odpowiedniej aparatury wytwarzającej ozon, która może być zastosowana na skalę techniczną. Dodatkowo w artykule opisano mechanizmy migracji tych związków wraz z określeniem ich źródeł w środowisku. Dalsze etapy badań obejmują identyfikację produktów pośrednich rozkładu analizowanych związków, a także poznanie dokładnego mechanizmu zachodzącego podczas stosowania różnych metod degradacji.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: The impact of the cucumber fruit preparation on their mechanical properties and microbial status of the souring brine during souring procedure
Autorzy:: Gorzelany, J.
Migut, D.
Matłok, N.
Balawejder, M.
Kačániová, M.
Tematy:: lactic acid bacteria
mechanical properties
ozonation souring; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Oddział w Lublinie PAN
Powiązania:: https://bibliotekanauki.pl/articles/411447.pdf Link otwiera się w nowym oknie
Opis:: Mechanical damage occurring during harvest, transportation or on various stages of processing of fruit and vegetables (in particular ground cucumbers) may lead to spoiling and disqualification of final products. Therefore investigations have been conducted to determine the cucumber’s resistance to mechanical damage and possible water loss in the raw material, as well as to enable the selection of best cucumber varieties suitable for processing. The goal of the conducted research was the determination of the impact of the cucumber variety, ozonation and the composition of the brine with the addition of probiotic bacteria on the mechanical properties and the microbial status of the final product. Mechanical properties were determined using a Zwick/ Roell Z010 machine and the data on the microorganisms were collected using Trypicase soy agar and MALDI TOF MS Biotyper. Other bacteria were detected using Man, Rogosa, and Sharpe agar media. The results indicate that a pre-ozonation or the addition of the probiotic both have a positive impact on the mechanical properties of the investigated product after the souring procedure. It was concluded the impact of both procedures on the puncture strength of final product was dependent on fruit variety.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Pilot Plant Studies on No_x Removal Via No Ozonation and Absorption
Badania w skali pilotowej dotyczące efektywności usuwana NO_x porzez utlenianie NO i absorpcję
Autorzy:: Kordylewski, W.
Jakubiak, M.
Hardy, T.
Tematy:: nitric oxide
ozonation
absorption
tlenek azotu
ozonowanie
absorpcja; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/205030.pdf Link otwiera się w nowym oknie
Opis:: The results of experimental investigations on the removal of NOx from gases applying ozone as the oxidizing agent and the absorption of higher nitrogen oxides in the sodium hydroxide solutions are presented. The experiment was conducted using a pilot plant installation with the air flow rate 200 m3/h, being a prototype of a boiler flue gas duct and a FGD scrubber. It was shown that in the range of [NOref] = 50 ÷ 250 ppm the mechanism of NO ozonation depends on the molar ratio X = O3/NOref: for X ≤ 1.0 oxidation of NO to NO2 predominates and NO2 is poorly absorbed, for X >> 1.0 NO2 undergoes further oxidation to N2O5, which is efficiently absorbed in the scrubber. The stoichiometric molar ratio of complete conversion of NO into N2O5 is X = 1.5, in these studies to reach the effectiveness η ≥ 90% the molar ratio X was much higher (2.75).
Przedstawiono wyniki badań doświadczalnych dotyczące usuwania NOx z gazów z zastosowaniem ozonu jako utleniacza i absorpcji wyższych tlenków azotu w roztworach wodorotlenku sodu. Badania prowadzono na strumieniu powietrza 200 m3/h w instalacji pilotowej będącej prototypem instalacji kotłowej odprowadzenia spalin i skrubera IOS. Wykazano, że w zakresie [NOref] =50÷250 ppm mechanizm ozonizacji NO zależy od stosunku molowego X = O3/NOref: dla X ≤ 1.0 przeważa utlenianie NO do NO2 a NO2 jest słabo absorbowany, dla X >> 1,0 NO2 ulega dalszemu utlenianiu do N2O5, który jest efektywnie absorbowany w skruberze. Stosunek molowy przy całkowitej konwersji NO do N2O5 wynosi X = 1.5, w przeprowadzonych badaniach, aby osiągnąć efektywność η ≥ 90% stosunek X był dużo większy (2,75).
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Numerical modelling of ozonation process with respect to bromate formation. Part I – Model development
Autorzy:: Olsińska, Urszula
Tematy:: model
ozonation
bromate
hydrodynamics
kinetics
ozonowanie
hydrodynamika
kinetyka; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Powiązania:: https://bibliotekanauki.pl/articles/185466.pdf Link otwiera się w nowym oknie
Opis:: The paper focuses on the modelling of bromate formation. An axial dispersion model was proposed to integrate the non-ideal mixing, mass-transfer and a kinetic model that links ozone decomposition reactions from the Tomiyasu, Fukutomi and Gordon (TFG) ozone decay model with direct and indirect bromide oxidation reactions, oxidation of natural organic matter and its reactions with aqueous bromine. To elucidate the role of ammonia an additional set of reactions leading to bromamine formation, oxidation and disproportionation was incorporated in the kinetic model. Sensitivity analysis was conducted to obtain information on reliability of the reaction rate constants used and to simplify the model.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: How to avoid mass transfer limitations in ozonation kinetics of phenylphenol isomers?
Autorzy:: Olak-Kucharczyk, M.
Ledakowicz, S.
Tematy:: phenylphenol isomers
ozonation in homogenous system ozonation kinetics
competition kinetics
classical kinetics
ozonowanie w jednorodnym systemem kinetyki ozonowania
kinetyka konkurencji
kinetyka; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Powiązania:: https://bibliotekanauki.pl/articles/185599.pdf Link otwiera się w nowym oknie
Opis:: Ozonation is a heterogeneous process of chemical absorption often controlled by a gas-liquid mass transfer rate. This paper presents the results of kinetics in a reaction between phenylphenol isomers and ozone. The degradation of phenylphenol isomers during ozonation proceeds quite fast. In order to avoid the influence of mass transfer limitati on the kinetics experiments were conducted in a homogenous liquid-liquid system. The second-order rate constantswere determined using classical and competition methods, which are especially recommended for fast reactions. The determined rate constants at pH 2 using the two different methods are almost the same. The increase of pH causes an increase of rate constants for the reaction of phenylphenol isomers with ozone.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: The effect of water ozonation in the presence of microplastics on water quality and microplastics degradation
Autorzy:: Kida, Małgorzata
Ziembowicz, Sabina
Wydawca:: Elsevier
Cytata wydawnicza:: SABINA, Ziembowicz; MAŁGORZATA, Kida. The effect of water ozonation in the presence of microplastics on water quality and microplastics degradation. Science of The Total Environment, 2024, 172595.
Opis:: Wyniki opublikowane w tym artykule to dane uzyskane w ramach projektu Miniatura 5 (2021/05/X/ST8/00567, NCN).
The occurrence of microplastics in water treatment plants poses a concern for the quality of treated water. When microplastics pass through water treatment plants, they can be oxidized, changing their surface characteristics and the quality of the treated water. This work aimed to investigate the impact of ozone and the association of ozone and hydrogen peroxide on five different microplastic particles that are commonly detected in water samples. The changes in the concentration of total organic carbon and the change in the pH of the water, the leaching of phthalic acid esters, as well as the changes in size and chemical changes in the structure of the tested microplastics were evaluated. The influence of ozonation time, water pH, and type of microplastics, as well as the influence of the addition of hydrogen peroxide, was analyzed. The effect of ozonation was an increase in DOC values ranging from 0.8 to 28 mg/L. The eluting substances included phthalic acid esters, plasticizers with a proven negative impact on organisms. The percentage loss of the surface area of the microplastic was in the range of 1.3 to 26.7%. PE was more susceptible to degradation. LDIR analyzes were carried out to investigate the effect of O3 and O3/H2O2 treatments on the surface of MPs. This study demonstrated that MPs could change their physical and chemical characteristics if they are subjected to oxidation processes used in water treatment plants. The parameters of purified water change to unfavorable ones due to the leaching of additives. Although much research has been conducted on the occurrence of microplastics in treated water, awareness needs to be raised about the interactions between plastic particles and water treatment technology processes.
Funding: 1. This publication reflects the implementation of Research Project No. 2021/05/X/ST8/00567 funded by the Poland National Science Center. 2. Financed by the Minister of Science and Higher Education Republic of Poland within the program "Regional Excellence Initiative”.
Dostawca treści:: Repozytorium Centrum Otwartej Nauki

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