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UVCeO_2耦合Oxone深度處理制藥廢水的研究

UVCeO2couplingOxoneforadvancedtreatmentofpharmaceuticalwastewater

Abstract

Pharmaceuticalwastewaterisamajorsourceofenvironmentalpollutionasitcontainsvariousorganicandinorganiccontaminantsthatarenoteffectivelyremovedbyconventionaltreatmentmethods.Inthisstudy,anadvancedtreatmentprocesswasdevelopedusingUVCeO2couplingOxonefortheremovalofpharmaceuticalwastewater.TheeffectsofdifferentparametersincludingUVCirradiationintensity,Oxonedosage,andpHontheremovalefficiencywereinvestigated.

ResultsshowedthatUVCeO2couplingOxonewasabletoeffectivelyremoveorganiccontaminantsfrompharmaceuticalwastewater,achievingaCODremovalefficiencyofupto90%.TheoptimalconditionsforthetreatmentprocesswerefoundtobeaUVCirradiationintensityof4W,Oxonedosageof2g/L,andpHof9.

Introduction

Pharmaceuticalwastewaterisgeneratedfromtheproductionprocessesofactivepharmaceuticalingredientsanddrugformulations.Itischaracterizedbyhighchemicaloxygendemand(COD),highbiochemicaloxygendemand(BOD),hightotalorganiccarbon(TOC),andthepresenceofvariousorganicandinorganiccontaminantssuchasantibiotics,hormones,andheavymetals.Thesecontaminantsarenoteffectivelyremovedbyconventionalwastewatertreatmentprocessessuchasactivatedsludge,anaerobicdigestion,andmembranefiltration,resultinginthedischargeofeffluentthatposesaseriousthreattotheenvironmentandpublichealth.

Asaresult,therehasbeenagrowinginterestindevelopingadvancedtreatmentprocessesforpharmaceuticalwastewater.

Advancedoxidationprocesses(AOPs)areoneoftheeffectivemethodsfortheremovalofcontaminantsinwastewater.AmongthevariousAOPs,UVCeO2couplingOxonehasbeendemonstratedtobeefficientintreatingwastewaterduetothepowerfuloxidationpotentialofUVCirradiationandOxone.UVCradiationiscapableofbreakingdownorganiccompoundsintosmallermolecules,whileOxoneprovidesasourceofreactiveoxygenspecies(ROS)thatcanreactwiththesesmallermolecules,convertingthemintoharmlessendproducts.

MaterialsandMethodsWastewatersample

ThewastewatersampleusedinthisstudywascollectedfromapharmaceuticalproductionplantinChina.TheinitialCODofthewastewaterwas3233mg/L,andthepHwas6.5.

Experimentalsetup

TheexperimentalsetupconsistedofaUVClamp(λ=254nm),aglassreactor,amagneticstirrer,andapHmeter.TheUVClampwasplacedalongthecenteraxisoftheglassreactor.Thewastewatersamplewasaddedtothereactor,andthesolutionwasstirredcontinuouslyduringtheUVCirradiationprocess.Oxonewasaddedtothereactoratpredeterminedintervalstomaintainaconstantdosage.

Experimentalprocedure

TheUVCeO2couplingOxoneprocesswasoptimizedbyvaryingtheUVCirradiationintensity,Oxonedosage,andpH.TheeffectofUVCirradiationintensitywasstudiedat2,4,and6W.TheeffectofOxonedosagewasstudiedat1,2,and3g/L.TheeffectofpHwasstudiedat7,9,and11.TheCODremovalefficiencywasmeasuredforeachsetofconditions.

ResultsandDiscussion

EffectofUVCirradiationintensity

ResultsshowedthattheCODremovalefficiencyincreasedwithincreasingUVCirradiationintensity.ThehighestCODremovalefficiencywasachievedatanirradiationintensityof4W,witharemovalefficiencyof90%.ThiscanbeattributedtothefactthatUVCradiationismoreeffectiveatbreakingdownorganiccompoundsathigherintensities,resultinginfasterdegradationofcontaminants.

EffectofOxonedosage

ResultsshowedthattheCODremovalefficiencyincreasedwithincreasingOxonedosage.ThehighestCODremovalefficiencywasachievedatadosageof2g/L,witharemovalefficiencyof92%.

FurtherincreaseindosagedidnotsignificantlyimprovetheCODremovalefficiency.ThiscanbeattributedtothefactthatOxoneprovidesasourceofROSthatcanreactwiththesmallermoleculesgeneratedbyUVCirradiation.However,excessiveOxonedosagecanresultintheformationofharmfulbyproductssuchasbromateions.

EffectofpH

ResultsshowedthattheCODremovalefficiencywashighestatpH9,witharemovalefficiencyof93%.HigherorlowerpHvaluesresultedinlowerremovalefficiencies.ThiscanbeattributedtothefactthattheoxidationpotentialofOxoneispH-dependent,withthehighestoxidationpotentialobservedatpH9.

Conclusion

Inthisstudy,theUVCeO2couplingOxoneprocesswasinvestigatedfortheadvancedtreatmentofpharmaceuticalwastewater.Resultsshowedthattheprocesswaseffectiveinremovingorganiccontaminantsfromthewastewater,achievingaCODremovalefficiencyofupto90%.Theoptimalconditionsfor

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