Search results for "Catalytic ozonation"

showing 8 items of 8 documents

Photocatalytic ozonation for a sustainable aquaculture: A long-term test in a seawater aquarium

2019

Abstract A long-term test at a laboratory scale with a closed system (a coral reef aquarium) has been carried out to study the potentialities of photocatalytic ozonation and photocatalysis for the removal of noxious organic compounds in recirculating systems (aquaria and recirculating aquaculture systems) working with a minimum make up of new water. Attention has been focused not only on the depuration capabilities but also on possible negative phenomena, some of which could become apparent only at long times. After having tuned the system by setting appropriate operating conditions and procedures, positive results were obtained. In particular, it was observed that the alternation of photoc…

AquariumPortable water purificationLaboratory scaleCatalysisCatalysiRecirculating aquaculture systemschemistry.chemical_compoundPhotocatalysiAquacultureOzonationRecirculating aquaculture systemPhotocatalysisGeneral Environmental SciencePhotocatalytic ozonationSettore ING-IND/24 - Principi Di Ingegneria Chimica2300business.industryProcess Chemistry and TechnologyPulp and paper industryBromatechemistrySustainable aquaculturePhotocatalysisEnvironmental scienceSeawaterWater qualitybusinessDepurationAquarium; Depuration; Ozonation; Photocatalysis; Photocatalytic ozonation; Recirculating aquaculture systemsApplied Catalysis B: Environmental
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Combination of ozonation and photocatalysis for purification of aqueous effluents containing formic acid as probe pollutant and bromide ion

2014

The treatment by advanced oxidation processes (AOPs) of waters contaminated by organic pollutants and containing also innocuous bromide ions may generate bromate ions as a co-product. In the present work heterogeneous photocatalysis and ozonation have individually been applied and in combination (integrated process) to degrade the organic compounds in water containing also bromide anions. The results show that: i) the sole photocatalysis does not produce bromate ions and in the case of its presence, it is able to reduce bromate to innocuous bromide ions; ii) the integration of photocatalysis and ozonation synergistically enhances the oxidation capabilities; and iii) in the integrated proces…

BromidesTime FactorsEnvironmental EngineeringFormatesTime FactorAdvanced oxidation processes; Bromate; Ozonation; Photocatalysis; Photocatalytic ozonation; Water purification; Bromates; Bromides; Catalysis; Formates; Ions; Kinetics; Oxidation-Reduction; Ozone; Time Factors; Water Pollutants Chemical; Ultraviolet Rays; Waste Disposal Fluid; Water Purification; Water Science and Technology; Waste Management and Disposal; Pollution; Ecological ModelingUltraviolet RaysFormic acidInorganic chemistryPortable water purificationWaste Disposal FluidCatalysisCatalysiCatalysischemistry.chemical_compoundOzonePhotocatalysiBromideOzonationIonWaste Management and DisposalBromateWater Science and TechnologyCivil and Structural EngineeringIonsKineticPhotocatalytic ozonationSettore ING-IND/24 - Principi Di Ingegneria ChimicaAqueous solutionWater purificationBromatesEcological ModelingFormateBromatePollutionKineticschemistryUltraviolet RayBromidePhotocatalysisOxidation-ReductionWater Pollutants ChemicalAdvanced oxidation processeWaste disposalWater Research
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Photocatalytic ozonation under visible light for the remediation of water effluents and its integration with an electro-membrane bioreactor

2018

Abstract Photocatalysis and photocatalytic ozonation under visible light have been applied for the purification of a complex aqueous matrix such as the grey water of Masdar City (UAE), by using N-doped brookite-rutile catalysts. Preliminary runs on 4-nitrophenol (4-NP) solutions allowed to test the reaction system in the presence of a model pollutant and to afford the relevant kinetic parameters of the process. Subsequently, the remediation of grey water effluent has been evaluated in terms of the reduction of total organic carbon (TOC) and bacterial counts. The concentration of the most abundant inorganic ionic species in the effluent has been also monitored during reaction. Photocatalytic…

Electrically enhanced membrane bioreactor; Grey water; Nitrogen-doped titanium dioxide; Photocatalytic ozonation; Visible light; Chemistry (all); Environmental ChemistryEnvironmental EngineeringLightEnvironmental remediationHealth Toxicology and Mutagenesis02 engineering and technology010501 environmental sciencesWastewaterMembrane bioreactor01 natural sciencesCatalysisNitrogen-doped titanium dioxideBioreactorsOzoneBioreactorEnvironmental ChemistryTurbidityEffluentEnvironmental Restoration and Remediation0105 earth and related environmental sciencesVisible lightTotal organic carbonPhotocatalytic ozonationAqueous solutionChemistryChemistry (all)Public Health Environmental and Occupational HealthMembranes ArtificialGeneral MedicineGeneral ChemistryElectrochemical Techniques021001 nanoscience & nanotechnologyPulp and paper industryPollutionGrey waterDisinfectionPhotocatalysisElectrically enhanced membrane bioreactor0210 nano-technologyWater Pollutants Chemical
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Heterogeneous catalytic degradation of phenolic substrates: catalysts activity

2009

This review article explored the catalytic degradation of phenol and some phenols derivates by means of advanced oxidation processes (AOPs). Among them, only the heterogeneous catalyzed processes based on catalytic wet peroxide oxidation. catalytic ozonation and catalytic wet oxidation were reviewed. Also selected recent examples about heterogeneous photocatalytic AOPs; will be presented. In details, the present review contains: (i) data concerning catalytic wet peroxide oxidation of phenolic compounds over metal-exchanged zeolites, hydrotalcites, metal-exchanged clays and resins. (ii) Use of cobalt-based catalysts, hydrotalcite-like compounds, active carbons in the catalytic ozonation proc…

Environmental EngineeringHealth Toxicology and MutagenesisHeterogeneous catalysisPeroxideCatalysisCatalysischemistry.chemical_compoundOzoneTransition metalCatalytic wet peroxide oxidation; Catalytic ozonation; Hydrotalcite-like compoundsPhenolsCatalytic wet peroxide oxidationEnvironmental ChemistryOrganic chemistryHydrotalcite-like compoundsWet oxidationZeoliteWaste Management and DisposalAcetic AcidAOPs Catalytic wet peroxide oxidation Catalytic ozonation Catalytic wet oxidation Phenol Acetic acid Metal-exchanged zeolites Hydrotalcite-like compounds Metal-exchanged/clays and resins Activated carbon Mixed oxides Noble metals CoOx/Al2O3-BaO catalystsPollutionNanomaterial-based catalystPeroxidesCatalytic oxidationchemistryMetalsCatalytic ozonationOxidation-Reduction
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Photocatalytic Ozonation: from Science to Aquaculture Applications

2016

Demographic growth and management of water and food resources are probably the most challenging issues of the coming years. In this scenario, intensive aquacultura will be increasingly important in the near future

Photocatalytic ozonationSettore ING-IND/24 - Principi Di Ingegneria ChimicaSettore CHIM/07 - Fondamenti Chimici Delle Tecnologie
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Strategy assessment to mediate between purification targets and bromate production during purification of bromide containing water by means of photoc…

2013

Settore CHIM/07 - Fondamenti Chimici Delle Tecnologiebromide oxidation photocatalytic ozonation
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Photocatalytic ozonation:Maximization of the reaction rate and control of undesired by-products

2014

In theso-calledphotocatalyticozonation(PO)synergisticeffectsbetweenphotocatalysisandozonation enhance therateofoxidationoforganiccompounds,thereforethisintegratedprocessisverypromising for useinwatertreatment.Inthepresentwork,itisdemonstratedthattheimprovementthatcanbe obtained bytheintegratedprocessincomparisonwiththeuncoupledprocessesdependsontherelative weight between photocatalysis and ozonation. In this respect, it has been found that a relatively low rate of photocatalysis (0.3 times the rate of ozonation)issufficienttogetthehighestsynergyandtomaximize the performancesintheoxidationofformate,theadoptedmodelorganiccompound.Thebenefitsof the couplingofphotocatalysistoozonationarenotlimi…

Settore ING-IND/24 - Principi Di Ingegneria ChimicaSettore CHIM/03 - Chimica Generale E InorganicaSettore ING-IND/25 - Impianti ChimiciPhotocatalysis Photocatalytic ozonation Ozone Bromate Process intensification
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Photocatalytic ozonation: Maximization of the reaction rate and control of undesired by-products

2015

Abstract In the so-called photocatalytic ozonation (PO) synergistic effects between photocatalysis and ozonation enhance the rate of oxidation of organic compounds, therefore this integrated process is very promising for use in water treatment. In the present work, it is demonstrated that the improvement that can be obtained by the integrated process in comparison with the uncoupled processes depends on the relative weight between photocatalysis and ozonation. In this respect, it has been found that a relatively low rate of photocatalysis (0.3 times the rate of ozonation) is sufficient to get the highest synergy and to maximize the performances in the oxidation of formate, the adopted model…

chemistry.chemical_classificationPhotocatalytic ozonationProcess Chemistry and TechnologyInorganic chemistrychemistry.chemical_elementBromateOrganic compoundNitrogenCatalysisReaction ratechemistry.chemical_compoundOzonePhotocatalysichemistryProcess intensificationScientific methodPhotocatalysisWater treatmentFormatePhotocatalysisBromateGeneral Environmental Science
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