A novel combined solar pasteurizer/TiO2 continuous-flow reactor for decontamination and disinfection of drinking water

Monteagudo, J.M.; Durán, A.; Martín, I. San; Acevedo, A

doi:10.1016/j.chemosphere.2016.11.142

Cited by 25 publications

(13 citation statements)

References 31 publications

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“…Although the valence band of TiO 2 is excited by both UV radiations, after 90 min of experiment the average removal yield when TiO 2 was used with UV-C radiation reached 97%, while 45% was reached in the presence of UV-A radiation. The TiO 2 valence band is capable of absorbing photons in the presence of electromagnetic radiation in the ranges below 390 nm [47], which represents two decontamination routes for this compound: (i) the reductive pathway, through the release of electrons that will reduce the concentration of MB; (ii) the oxidative pathway in the gaps of the valence band that absorb electrons from either the contaminating compound or from water, which will produce hydroxyl radicals capable of oxidizing MB. Besides, it is required to remark that according to Tichapondwa et al [48], in the system TiO 2 /UV-C to remove MB, 1.3% corresponds to photolysis, 7.4% to adsorption, and 81.4% to photocatalysis.…”

Section: Resultsmentioning

confidence: 99%

Study of the Photocatalytic Activity of TiO2 and Fe2+ in the Activation of Peroxymonosulfate

González-Quiles

Andrés

Rodríguez-Chueca

2021

Water

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The increase in world population and human activities are leading to an increase in water stress in many regions of the planet, coupled with a decrease in the quality of water bodies. Advanced oxidation processes have demonstrated great potential for the reduction of almost any organic pollutant; however, it is necessary to intensify this type of treatment in order to reduce contact times and to reach a greater number of pollutants. The generation of sulfate radicals by activation of peroxymonosulfate (PMS) by divalent iron (Fe2+) and/or titanium dioxide (TiO2) were statistically studied to understand the role of these compounds as activators, using methylene blue as target pollutant because of its ease of handling and analysis. A factorial experimental design was used to study the influence of different variables (PMS, Fe2+, and TiO2) in the presence of UV-A or UV-C. There were relevant differences in the discoloration of methylene blue when analyzing the size of the effects and significance of the experiments, when UV-A or UV-C was used, being faster with UV-C. For instance, total discoloration of methylene blue was reached after 60 min with the system PMS/UV-C, while after 90 min only the 59% of methylene blue disappeared in presence of PMS/UV-A. Both Fe2+ and TiO2 in combination with PMS and UV increased the discoloration effect. So, in the presence of Fe2+, total discoloration of methylene blue was observed after 30 min in presence of UV-A, while this yield was reached in 7.5 min under UV-C. In the case of PMS/TiO2, it required 60 min under UV-A radiation to totally remove methylene blue, and around 15 min with UV-C. Statistically, the three variables were observed to have the main effect in combination with UV. Furthermore, the PMS/Fe2+ system has a significant interaction with UV-A and UV-C radiation, while the interaction of PMS/TiO2 was significant under UV-A, but with a negative effect under UV-C, or in other words the high elimination rates observed are achieved by the oxidation potential of UV-C, and the effect of PMS and TiO2 by itself.

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Section: Resultsmentioning

confidence: 99%

Study of the Photocatalytic Activity of TiO2 and Fe2+ in the Activation of Peroxymonosulfate

González-Quiles

Andrés

Rodríguez-Chueca

2021

Water

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“…It is well known that upon using TiO 2 , both hydroxyl and superoxide radicals are generated, which act as a catalyst under direct sunlight (UVA). ROSs including HO and O 2 − generated from TiO 2 , which are able to oxidize and convert most of the organic molecules to simpler forms or induce mineralization (complete oxidization to CO 2 and H 2 O) [100]. H 2 O 2 and singlet oxygen are other oxidative species that may be generated, which also react together with hydroxyl radicals and superoxide, resulting in bacterial deactivation due to the excessive damage of their cell membrane and genetic material [101].…”

Section: Enhancement Of Sodis Using Photocatalystmentioning

confidence: 99%

Insights into Solar Disinfection Enhancements for Drinking Water Treatment Applications

et al. 2021

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Poor access to drinking water, sanitation, and hygiene has always been a major concern and a main challenge facing humanity even in the current century. A third of the global population lacks access to microbiologically safe drinking water, especially in rural and poor areas that lack proper treatment facilities. Solar water disinfection (SODIS) is widely proven by the World Health Organization as an accepted method for inactivating waterborne pathogens. A significant number of studies have recently been conducted regarding its effectiveness and how to overcome its limitations, by using water pretreatment steps either by physical, chemical, and biological factors or the integration of photocatalysis in SODIS processes. This review covers the role of solar disinfection in water treatment applications, going through different water treatment approaches including physical, chemical, and biological, and discusses the inactivation mechanisms of water pathogens including bacteria, viruses, and even protozoa and fungi. The review also addresses the latest advances in different pre-treatment modifications to enhance the treatment performance of the SODIS process in addition to the main limitations and challenges.

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“…E. coli removal using TiO 2 deposited on a flat cellulose support was successfully demonstrated 27,28 . Degradation of pharmaceutical compounds in urban wastewater by means of a continuous flow at the surface of a TiO 2 ‐coated borosilicate tube was also investigated 29 . Recent researches have examined a combination of a photo‐fenton process with a photocatalytic treatment supply in plug flow approaching reactors 30 or in the case of advanced filter membrane treatment 31 …”

Section: Introductionmentioning

confidence: 99%

“…27,28 Degradation of pharmaceutical compounds in urban wastewater by means of a continuous flow at the surface of a TiO 2coated borosilicate tube was also investigated. 29 Recent researches have examined a combination of a photo-fenton process with a photocatalytic treatment supply in plug flow approaching reactors 30 or in the case of advanced filter membrane treatment. 31 The first objective of this study is to continue the acquisition of experimental data on the performance of a continuous flow heterogeneous photocatalytic process intended to use solar energy.…”

Section: Introductionmentioning

confidence: 99%

Continuous flow photocatalytic reactor using TiO₂‐coated foams, modeling and experimental operating mode

et al. 2022

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This article aims to build a modeling and simulating tool of the operation of a continuous flow heterogeneous photocatalysis reactor. Continuous flow is well-known in reactor engineering for allowing advanced control of reactor and scaling-up with great confidence, but little research has addressed it's potential for this kind of application. In developing this model, particular attention was paid to the coupling which occurs at local scale between the radiative transfer and the reaction kinetics of advanced oxidation of a target organic micro-pollutant. The solution of the radiative transfer equation by Monte Carlo method was applied to a photocatalyst supported on a macroporous ceramic foam forming an efficient 3D support. After identification of the kinetic law of degradation, the dynamic simulation model was validated through comparison with a series of experiments performed for different but constant irradiations and for variable irradiations approaching, in term of intensity and dynamics, natural solar radiation.

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A novel combined solar pasteurizer/TiO2 continuous-flow reactor for decontamination and disinfection of drinking water

Cited by 25 publications

References 31 publications

Study of the Photocatalytic Activity of TiO2 and Fe2+ in the Activation of Peroxymonosulfate

Study of the Photocatalytic Activity of TiO2 and Fe2+ in the Activation of Peroxymonosulfate

Insights into Solar Disinfection Enhancements for Drinking Water Treatment Applications

Continuous flow photocatalytic reactor using TiO₂‐coated foams, modeling and experimental operating mode

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A novel combined solar pasteurizer/TiO2 continuous-flow reactor for decontamination and disinfection of drinking water

Cited by 25 publications

References 31 publications

Study of the Photocatalytic Activity of TiO2 and Fe2+ in the Activation of Peroxymonosulfate

Study of the Photocatalytic Activity of TiO2 and Fe2+ in the Activation of Peroxymonosulfate

Insights into Solar Disinfection Enhancements for Drinking Water Treatment Applications

Continuous flow photocatalytic reactor using TiO2‐coated foams, modeling and experimental operating mode

Contact Info

Product

Resources

About

Continuous flow photocatalytic reactor using TiO₂‐coated foams, modeling and experimental operating mode