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1、6590Ind.Eng.Chem.Res.2007,46,6590-6599CFDModelfortheDesignofLargeScaleFlotationTanksforWaterandWastewaterTreatmentM.Kostoglou,T.D.Karapantsios,*andK.A.MatisDiVisionofChemicalTechnology,DepartmentofChemistry,UniVersityBox116,AristotleUniVersityofThessaloniki,54124Thessaloniki,Gr
2、eeceACFDmodelincorporatingflotationkineticexpressionsisdevelopedtosimulatetheperformanceofflotationtanksutilizedinwaterandwastewatertreatmentplants.Thefocushereisontanksthatoperatewithoutanyexternalmeansofflowmixing(impeller,etc.),suchasDissolvedAirFlotation(DAF)tanks,wherebubb
3、lebuoyancy,particlesettling,andturbulencearemechanismscontributingcomparablytolocalflotationrates.Theseflotationmechanismsareanalyzed,andthevariationoftheirrelativecontributionwithrespecttobasicparametersoftheflotationprocessisexamined.Toincreasethecomputationefficiency,realist
4、icassumptionsaremaderegardingthefluiddynamicsandparticleconservationissuesofthemodel,andCFDsimulationsareperformedinatwo-dimensionalframeofreference.Simulationresultsdemonstratetheexistenceofacomplexinteractionbetweentankhydrodynamicsandlocalflotationrateswhichleadtoparticlerem
5、ovalefficienciesthatcouldneverbeinvokedbyflotationtheoriesalone.Introductioneters(tankdimensions,internalbafflearrangements,waterflowrate,andairflowrate)hefoundthattheinjectedair-to-waterFlotationtechnologyisfrequentlyappliedinwaterandflowmomentumratiowasthemostcriticaldesignpa
6、rameterwastewatertreatment.Solidparticulatecontaminatedwaterdictatingtheeffectivemixingofairwiththemainliquidstream.enterstheflotationtankwheresmalldiameterairbubblesareHagueetal.4comparedsimulationsusingak-turbulenceinjectedandmixedwithit.Flowmixingenhancesbubblemodelagainstl
7、aminarflowsimulationsand,furthermore,againstdispersionandkeepsthesolidparticlesinsuspensionalthoughlaserDopplervelocimetrydataforsingle-andtwo-phaseflowthesuspensionmaynotbeuniform,withthelargerheavierinalabscaleDAFtank(averagebubblesize50ím)usingparticlestendingtoremaininthelo
8、werpartsofthetank.RisingFLUENT4.5code.Strangely,attheq
