Disinfection by Chemical Oxidation Methods

Galeano, Luis-Alejandro; Guerrero-Flórez, Milena; Sánchez, Claudia-Andrea; Gil, Antonio; Vicente, M.A.

doi:10.1007/698_2017_179

Cited by 15 publications

(8 citation statements)

References 196 publications

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“…The decrease in the efficiency of the treatment as the [H2O2] is increased can explained since an excess of the oxidizing agent in the medium can lead to the hijack of hydroxyl radicals and the formation of superoxide radicals which decrease the efficiency of the process. The latter has a lower reduction potential (E0 = +1.70 V) when compared to the H2O2 (E0 =+2.80 V), justifying the lower degradation when there is an excess of hydrogen peroxide in the solution (Galeano et al, 2019;Gautam;Lokhandwala, 2019).…”

Section: Univariate Studymentioning

confidence: 99%

Employment of advanced oxidation processes in the degradation of a textile dye mixture: evaluation of reaction parameters, kinetic study, toxicity and modeling by artificial neural networks

Oliveira

Neves

Santana

et al. 2022

REGET

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Organic contaminants in industrial effluents threaten the quality of water resources, especially due to their resistance to natural degradation. The textile industry gain relevance, considering that it generates large volumes. This work aimed to evaluate the efficiency of different advanced oxidation processes (AOP) for the degradation of the mixture textile dyes in solution. After optimization of the main parameters involved in the applied processes and systems, the AOP with greater efficiency in the degradation of the compounds was the photo-Fenton/UV-C (92%) after 360 min of treatment. The experimental data showed a better fit to the Chan and Chu kinetic model and trough an evaluation using artificial neural networks it was possible to predict the maximum degradation achievable by the dye mixture. The toxicity assays, using multiple species of seeds indicated a treated solution with no toxic effects and that the applied methodology can be used without affecting the water resources.

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Section: Univariate Studymentioning

confidence: 99%

Employment of advanced oxidation processes in the degradation of a textile dye mixture: evaluation of reaction parameters, kinetic study, toxicity and modeling by artificial neural networks

Oliveira

Neves

Santana

et al. 2022

REGET

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“…However, the role of intracellular ROS is directly associated with processes that are harmful to bacterial physiology rather than with biogenic weathering activity. In addition, psychrophilic bacteria have developed protection systems against oxidative stress in low-temperature environments [50], especially due to the effect of UV radiation (photofenton) [51], increasing the levels of radical species, and in response, creating a large amount of antioxidant enzymes such as catalases, superoxide dismutases (FeSOD and MnSOD) [52], and glutathione to avoid the oxidative damage [53].…”

Section: Discussionmentioning

confidence: 99%

Manganese-Oxidizing Antarctic Bacteria (Mn-Oxb) Release Reactive Oxygen Species (ROS) as Secondary Mn(II) Oxidation Mechanisms to Avoid Toxicity

Jofré

Matus

Mendoza

et al. 2021

Biology

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Manganese (Mn) oxidation is performed through oxidative Mn-oxidizing bacteria (MnOxb) as the main bio-weathering mechanism for Mn(III/IV) deposits during soil formation. However, with an increase in temperature, the respiration rate also increases, producing Reactive Oxygen Species (ROS) as by-products, which are harmful to microbial cells. We hypothesize that bacterial ROS oxidize Mn (II) to Mn (III/IV) as a secondary non-enzymatic temperature-dependent mechanism for cell protection. Fourteen MnOxb were isolated from Antarctic soils under the global warming effect, and peroxidase (PO) activity, ROS, and Mn (III/IV) production were evaluated for 120 h of incubation at 4 °C, 15 °C, and 30 °C. ROS contributions to Mn oxidation were evaluated in Arthrobacter oxydans under antioxidant (Trolox) and ROS-stimulated (menadione) conditions. The Mn (III/IV) concentration increased with temperature and positively correlated with ROS production. ROS scavenging with Trolox depleted the Mn oxidation, and ROS-stimulant increased the Mn precipitation in A. oxydans. Increasing the Mn (II) concentration caused a reduction in the membrane potential and bacterial viability, which resulted in Mn precipitation on the bacteria surface. In conclusion, bacterial ROS production serves as a complementary non-enzymatic temperature-dependent mechanism for Mn (II) oxidation as a response in warming environments.

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“…Researchers have stated that in the presence of excess hydrogen peroxide, possible secondary reactions occur between H2O2 and the hydroxyl radical ( • OH), resulting in a decrease in the activity of the hydroxyl radical (Eq. 11 and 12) [30,31]. This causes the removal efficiency of contaminants to decrease.…”

Section: Effect Of H2o2 Dosage On the Decolorizationmentioning

confidence: 99%

Decolorization of reactive azo dye by fenton and photo-fenton processes in aqueous solution: The influence of operating conditions, kinetics study, and performance comparison

Değermenci̇¹

2022

Bull. Chem. Soc. Eth.

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ABSTRACT. In this study, the effect of Fenton and photo-Fenton processes, which are advanced oxidation processes that use the hydroxyl radical for the decolorization of Novacron Black from aqueous solutions, on decolorization was investigated. Optimum levels of initial pH, temperature, hydrogen peroxide concentration, initial dyestuff concentration, and iron concentration were determined. Initial pH, Fe2+ concentration, temperature, and initial Novacron Black concentration are the most effective experimental parameters in the decolorization of Novacron Black with Fenton and photo-Fenton processes. While the Novacron Black concentration was 200 mg/L, the H2O2 concentration was 100 mg/L, the initial solution pH was 3, and the temperature was 20 °C, a decolorization efficiency of 82.1% was obtained in the Fenton process at a concentration of 5 mg/L Fe2+, while in the photo-Fenton process at a 2 mg/L Fe2+ concentration, a 94.6% decolorization efficiency was obtained. Upon decolorization of Novacron Black, the photo-Fenton process had a higher removal efficiency than the Fenton process, even at low iron concentrations. From data obtained at various concentrations of initial Novacron Black, the non-linear method was used to determine the decolorization kinetics of Novacron Black. Finally, an economic analysis was carried out to compare the differences in operating costs between Fenton and photo-Fenton processes. KEY WORDS: Advanced oxidation process, Decolorization, Fenton oxidation, Kinetic model, Photo-Fenton oxidation Bull. Chem. Soc. Ethiop. 2023, 37(1), 197-210. DOI: https://dx.doi.org/10.4314/bcse.v37i1.16

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Disinfection by Chemical Oxidation Methods

Cited by 15 publications

References 196 publications

Employment of advanced oxidation processes in the degradation of a textile dye mixture: evaluation of reaction parameters, kinetic study, toxicity and modeling by artificial neural networks

Employment of advanced oxidation processes in the degradation of a textile dye mixture: evaluation of reaction parameters, kinetic study, toxicity and modeling by artificial neural networks

Manganese-Oxidizing Antarctic Bacteria (Mn-Oxb) Release Reactive Oxygen Species (ROS) as Secondary Mn(II) Oxidation Mechanisms to Avoid Toxicity

Decolorization of reactive azo dye by fenton and photo-fenton processes in aqueous solution: The influence of operating conditions, kinetics study, and performance comparison

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