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1、Modelingofganicpollutantdestructioninastirred2tankreactbyozonationCHENGJiang1YANGZhuo2ru1CHENHuan2qin1KUOC.H.2ZAPPIE.M.2Abstract:Destructionofganiccontaminantsinwaterbyozonationisagas2liquidprocesswhichinvolvesozonemasst

2、ransferfastirreversiblechemicalreactions.Ozonationreactdesignprocessoptimizingrequirethemodelingofthegas2liquidinteractionswithinthereact.Inthispaperatheeticalmodelcombiningthefluiddynamicreactionkiicparametersisproposed

3、fpredictingthedestructionratesofganicpollutantsinasemi2batchstirredtankreactbyozonation.Asimpleexpressionftheenhancementfactasourpreviouswkhasbeenappliedtoevaluatethechemicalmasstransfercoefficientinozoneabsption.242dich

4、lophenol(242DCP)262DCPtheirmixturearechosenasthemodelcompoundsfsimulatingthepredictedDCPconcentrationsarecomparedwithsomemeasureddata.Keywds:dichlophenoldestructionozonationstirred2tankreactenhancementfactIntroductionBec

5、auseofthehighoxidationpotentialofozone(O3)ozonationhasbeenregardedasapromisingmethodfdrinkingwastewatertreatment.AwiderangeofganicpollutantsinwatercanbedegradedbyO3O3combinedwithH2O2UVlightwhichareknownasAdvancedChemical

6、OxidationProcesses(AOPs).Comparedtothetraditionaltreatmenttechnologiessuchasactivatedcarbonadsptionbiodegradationchemicaloxidationwithozoneofferstheadvantagesofgreaterrateextentofcontaminantdestruction.Althoughtherearenu

7、merousrepts(Hoigne1983David1991)ontheozonationkiicsresearchregardingreactionrateconstantstoichiometricratiotheidentificationofintermediatesapplicationofthesereactionkiicstoyieldessentialinfmationfsuccessfulreactprocessde

8、signhasnotbeenreceivedsufficientattention(Yue1992).Thismaybepartlyduetothelackofthechemicalmasstransfercoefficientofozoneinaspecificreact.Itiswellknownthatthemasstransferrateofagaseoussoluteinabsptionisenhancedbychemical

9、reactions.TheextentofthisinfluenceisexpressedintermsoftheenhancementfactEwhichisdefinedastheratioofthemasstransfercoefficientofthechemicalabsptiontothatofphysicalabsption.Ingeneralitishardtodeterminethechemicalmasstransf

10、ercoefficientbyexperimentespeciallyinabsptionprocessesaccompaniedbycomplexreactionswhilethephysicalmasstransfercoefficientmayeasilybeobtainedexperimentallyfromsemiempiricalapproaches.BasedonthefilmtheyKuo(Kuo1982)propose

11、daniterationmethodfpredictingtheenhancementfactofmasstransferbyozoneself2decompositionozonationreactions.BecausethederivedenhancementfactisanimplicitexpressionitisinconvenientinapplicationtosimulatingthewhereDADBarethedi

12、ffusivityofozoneganicBrespectively.kisthesecondderreactionconstantkdisthefirstderozoneself2decompositionreactionconstant.ItshouldbenotedthatEq.(2)isvalidonlyifthefollowingconditionholdsM=MdM1[1(E1)Q]4.1.2Destructionofthe

13、mixtureofganicpollutantsinaqueoussolutionbyozonationWhentwomecontaminantsarepresentinitiallyintheliquidtheabsptionofozoneisaccompaniedbyparallelozonationreactions.Ifthecompetitionbetweenthesereactionsisconsideredtobedepe

14、ndentonlyonthereactionconstantsthedepletionrateofganiccomponentBjintheliquidphasecanbederivedasThemassbalancefozoneAinthegasphaseisthesameasEq.(1).Ftheenhancementfactinozoneabsptionwithparallelozonationreactionsanapproxi

15、mateexpressioncanalsobededucedrelatingtothesurfacerenewalmodelas(Cheng2000)whereEjrepresentsthesupposedenhancementfactinozoneabsptionaccompaniedbyafirstderozoneself2decompositionreactionasecondderozonationreactionofasing

16、lereactantBj.2Simulatingexperimentalresults242DCP262DCPisomerswerechosenasthemodelcompoundsfsimulatingwhicharetheleastmostreactivespecieswithozoneintheDCPisomersrespectively.Dichlophenolshavebeenwidelyusedintheproduction

17、ofpesticidesdyesotherindustrialchemicals.Theyarelistedamongthe65priitypollutantsbytheEPAintheCleanWaterActof1977.ThewaterqualitycriteriarecommendedbytheEPAfDCPis0.04to0.5μgL1.FozoneabsptioninasingleDCPsolutiontheenhancem

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