Ozone-Based Processes

Ikehata, Keisuke; Li, Yuan

doi:10.1016/b978-0-12-810499-6.00005-x

Cited by 46 publications

(36 citation statements)

References 58 publications

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“…The Fenton process has obtained important results in the treatment of tannery wastewater, 93% COD, 98% BOD and 62% chromium were removed when combined with a biological process using Thiobacillus ferrooxidans [ 86 ]. Another advanced oxidation method is ozone, which has been implemented in wastewater treatment due to its ability to reduce color, synthetic aromatic compounds and persistent organic pollutants (POPs) [ 101 , 102 , 103 , 104 , 105 ]. This process has not only demonstrated its effectiveness in pollutant removal, but also works well with biological degradation processes as the integrated treatment significantly improves performance [ 35 , 106 ].…”

Section: Technologies For the Treatment Of Tannery Wastewatermentioning

confidence: 99%

Advanced Oxidation Processes and Biotechnological Alternatives for the Treatment of Tannery Wastewater

2021

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The tannery industry is one of the economic sectors that contributes to the development of different countries. Globally, Europe and Asia are the main producers of this industry, although Latin America and Africa have been growing considerably in recent years. With this growth, the negative environmental impacts towards different ecosystem resources as a result of the discharges of recalcitrated pollutants, have led to different investigations to generate alternative solutions. Worldwide, different technologies have been studied to address this problem, biological and physicochemical processes have been widely studied, presenting drawbacks with some recalcitrant compounds. This review provides a context on the different existing technologies for the treatment of tannery wastewater, analyzing the physicochemical composition of this liquid waste, the impact it generates on human health and ecosystems and the advances in the different existing technologies, focusing on advanced oxidation processes and the use of microalgae. The coupling of advanced oxidation processes with biological processes, mainly microalgae, is seen as a viable biotechnological strategy, not only for the removal of pollutants, but also to obtain value-added products with potential use in the biorefining of the biomass.

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Section: Technologies For the Treatment Of Tannery Wastewatermentioning

confidence: 99%

Advanced Oxidation Processes and Biotechnological Alternatives for the Treatment of Tannery Wastewater

2021

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“…Se ha postulado que la fotólisis de las moléculas de O 3 producen directamente H 2 O 2 . Posteriormente, el H 2 O 2 puede experimentar una reacción de fotólisis para formar dos radicales • OH, como se muestra enseguida [54,55] :…”

Section: Oxidación Por Ultravioleta/peróxidounclassified

Procesos de Oxidación Avanzada y Electroquímicos para Remover Edulcorantes Artificiales del Agua

Juárez¹

2020

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RESUMENEl objetivo de la presente revisión es presentar investigaciones recientes sobre la remoción de algunos edulcorantes -reconocidos como contaminantes emergentes-del agua o matrices acuosas, utilizando los Procesos de Oxidación Avanzada (POA). En un intento por evadir el consumo de endulzantes calóricos que han provocado problemas de salud, los seres humanos consumen edulcorantes artificiales que prácticamente no se metabolizan después de ingerirse, de esa forma se integran al agua residual e inclusive resisten la degradación total en las plantas de tratamiento de agua convencionales. Por tanto, en bases de datos se revisaron electrooxidación, electro-Fenton, foto-Fenton, fotocatálisis heterogénea, oxidación por ultravioleta/peróxido y oxidación por ultravioleta/ozono, catalogados como POA. Estos procesos son una alternativa debido a que generan radicales hidroxilo ·OH, caracterizados por su alto poder oxidante. La electrooxidación se puede declarar como la más conveniente para la degradación de edulcorantes artificiales como el acesulfamo de potasio, por ejemplo, debido a la menor cantidad de componentes requeridos para su ejecución y, al mismo tiempo, se logra una eficiencia de remoción similar, o incluso mayor, comparada con otros POA. Igualmente, se documentaron los resultados y méritos relativos a la aplicación de estos al agua o matrices acuosas, así como las oportunidades para investigación futura. ABSTRACTThe objective of this review is to present recent research on the removal of some sweeteners-recognized as emerging contaminants-from water or aqueous matrices, using the Advanced Oxidation Processes (AOPs). In an attempt to evade the consumption of caloric sweeteners that has caused health problems, humans consume artificial sweeteners that are practically not metabolized after ingestion, thus integrating into wastewater and even resisting total degradation in plants conventional water treatment. Therefore, electro-oxidation, electro-Fenton, photo-Fenton, heterogeneous photocatalysis, ultraviolet / peroxide oxidation and ultraviolet / ozone oxidation cataloged as AOPs were reviewed in databases. These processes are an alternative because they generate hydroxyl radicals ·OH characterized by their high oxidizing power. Electro-oxidation can be declared as the most convenient for the degradation of artificial sweeteners such as potassium acesulfame, for example, due to the lower amount of components required for its execution and at the same time the achievement of a similar removal efficiency, or even greater, compared to other AOPs. Likewise, the results and merits related to their application to water or aqueous matrices were documented, as well as the opportunities for future research.

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“…In the case of ozone-based processes, removal rates above 90% can be achieved for PPCPs [ 11 ], the main drawbacks being the incomplete mineralization of the compounds, high energy consumption or limited oxidation of hazardous compounds due to their recalcitrant nature [ 12 ]. This removal rates can be improved by combining this technique with other strong oxidants such as H 2 O 2 , UV light or catalysts such as transition metals (Cu(II), Fe(II), ZnO(II), …) or metal oxides (TiO 2 , Fe 2 O 3 , …) [ 13 , 14 ]. Although ozonation is the process applied on a large scale for disinfection, color and odor removal and oxidation of contaminants in drinking water treatment plants, its use is not widespread in WWTPs [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

“…This removal rates can be improved by combining this technique with other strong oxidants such as H 2 O 2 , UV light or catalysts such as transition metals (Cu(II), Fe(II), ZnO(II), …) or metal oxides (TiO 2 , Fe 2 O 3 , …) [ 13 , 14 ]. Although ozonation is the process applied on a large scale for disinfection, color and odor removal and oxidation of contaminants in drinking water treatment plants, its use is not widespread in WWTPs [ 13 ]. In this context, other processes, such as semiconductor-based reactions or the Fenton process, are being investigated for the removal of emerging contaminants.…”

Section: Introductionmentioning

confidence: 99%

Reusable Fe3O4/SBA15 Nanocomposite as an Efficient Photo-Fenton Catalyst for the Removal of Sulfamethoxazole and Orange II

et al. 2021

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Today, the presence of recalcitrant pollutants in wastewater, such as pharmaceuticals or other organic compounds, is one of the main obstacles to the widespread implementation of water reuse. In this context, the development of innovative processes for their removal becomes necessary to guarantee effluent quality. This work presents the potentiality of magnetic nanoparticles immobilized on SBA-15 mesoporous silica as Fenton and photo-Fenton catalysts under visible light irradiation. The influence of the characteristics of the compounds and nanoparticles on the removal yield was investigated. Once the key aspects of the reaction mechanism were analyzed, to evaluate the feasibility of this process, an azo dye (Orange II) and an antibiotic (sulfamethoxazole) were selected as main target compounds. The concentration of Orange II decreased below the detection limit after two hours of reaction, with mineralization values of 60%. In addition, repeated sequential experiments revealed the recoverability and stability of the nanoparticles in a small-scale reactor. The benchmarking of the obtained results showed a significant improvement of the process using visible light in terms of kinetic performance, comparing the results to the Fenton process conducted at dark. Reusability, yield and easy separation of the catalyst are its main advantages for the industrial application of this process.

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Ozone-Based Processes

Cited by 46 publications

References 58 publications

Advanced Oxidation Processes and Biotechnological Alternatives for the Treatment of Tannery Wastewater

Advanced Oxidation Processes and Biotechnological Alternatives for the Treatment of Tannery Wastewater

Procesos de Oxidación Avanzada y Electroquímicos para Remover Edulcorantes Artificiales del Agua

Reusable Fe3O4/SBA15 Nanocomposite as an Efficient Photo-Fenton Catalyst for the Removal of Sulfamethoxazole and Orange II

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