硕士论文-电Fenton法预处理青霉素废水的研究

湖南大学硕士学位论文电-Fenton法预处理青霉素废水的研究姓名：黄昱申请学位级别：硕士专业：环境工程指导教师：李小明20070425I-Fenton-FentonFentonFentonFe2+H2O2HO•-FentonFe2+H2O2PGN(infraredspectrogram,IR)-(Liquidchromatogram-Masschromatogram,LC-MS)PGNCODTOCBOD5/CODT=20pH=30.5g/LFeSO4·7H2O0.2mL/LH2O20.3APGN100mg/L20minCOD64.35%BOD5/COD00.38IRLC-MSβ-H2O2-FentonFe2+-Fenton-FentonIIAbstractThesourcesofantibioticsinnaturalwatersystemsmaybemanufacturingoperationsinpharmaceuticalindustry,therapeuticuseforhumanandanimalsandhighamountuseasgrowthpromotersinintensivefarming.Thesepollutionsourcesareemissionsfromproductionsites,hospitals,breedingfarmsandhouseholds.Antibioticwastewaternormallycontainsmanyorganicmattersincludingbacteriostaticandtoxicaswellasrecalcitrantcompoundsandwithdarkcolor,whichthereforewasregardedasanon-biodegradablewastewater.Theysurvivedontheeffluentofsewagetreatmentplant(STP)andpollutethenaturalwater.Moreover,theresidualscangetintothefoodchainbyfishbreedingandpoultryraising,andthenenterthehumanbodybythefoodchaintransportwhichwouldcauseanenhancedantibodyanddamagehumanhealthy.ForremovingtheresidualantibioticinSTP,separationandpretreatmentofantibioticwastewaterbyadvancedoxidationprocesses(AOPs)wasproposedandresearched.ButtheapplicationshowthatmanyAOPswerelimitedappliedfortheirdisadvantagessuchashighcostandcomplexprocess.Electro-FentonprocessisonekindofAOPs,whichcandestroytheantibioticmolecularstructureandremovetheirrecalcitrantcharacterasapretreatmentprocess.Inthisstudy,bothH2O2andFe2+areexternallyemployedwhereasFe2+isbeingcontinuouslyregeneratedatcathodewhichcancatalyzeH2O2tocontinueproduceHO•.Thismethodincludeoxidationandelectrolysis,thusdegradetheorganicmattereffectively.Itwouldbeapromisingmethodforitsadvantagesoflowcostandeasyoperation.ThedegradationofpenicillinGsodium(PGN)simulatedwastewaterbyelectro-Fentonhasbeeninvestigated.Trialswereperformedinabatchreactor,aimingatbothanalyzingtheeffectsoftheoperatingconditions(pHinitialFe2+concentrationinitialH2O2concentrationinitialPGNconcentrationinitialelectrolyteconcentrationtemperaturecurrent)onCODremovalandselectingthebestoperatingconditionsofCODremovalandBOD5/CODenhancement.OperatingatT=20,pH=3,[FeSO4·7H2O]=0.5g/L,[H2O2]=0.2mL/L,[PGN]=100mg/L,andelectriccurrent=0.3A,about64.35%ofCODwasremovedandanincreaseoftheBOD5/CODratiofrom0to0.38wasachievedafter20min.ThedetectionofPGNdegradationproductswerebasedoninfraredspectrogram(IR)andliquidchromatography–tandemmassspectrometry(LC-MS),theresultshowedthattheβ-lactamcyclicofPGNwasbrokenIIIandPGNcouldbedegradedbybiologicaltreatmentafteroxidationonelectro-Fentonasitlosttheantisepticability.Tobeafurtherresearch,akineticsmodelofthePGNdegradationwasestablishbaseontheexperimentaldataoftheeffectsofinitialFe2+concentration,initialH2O2concentration,initialPGNconcentrationandtemperaturebyPGNremoval.ThereactionrateconstantandreactionorderoftheoverallequationforPGNdegradationindicatethatthereactionrateisveryfastandtheeffectofinitialH2O2concentrationisgreaterthaninitialFe2+concentrationonPGNdegradationbyelectro-Fenton.KeyWords:Electro-Fenton;Pretreatment;PenicillinG;DegradationRule;Biodegradability;Kinetics-FentonIV3.1PGN................................................................................................363.2Fenton................................................................................403.3pHCODBOD5/COD.............................................423.4Fe2+COD....................................................................433.5H2O2COD..................................................................453.6PGNCOD..................................................................453.7COD..........................................................................463.8COD.......................................................473.9............................................................................483.10...................................................................483.11COD.............................................................483.12COD........................................................................504.1............................................................................534.2............................................................................544.3FentonPGNCODTOC............................604.4FentonBOD5/CODpH................................604.5PGN.................................................................624.6PGN................................................................................................624.7PGN........................................................................634.8PGN............................................................................................645.1Fe2+PGN.......................................................................725.2Fe2+..........................................................725.3H2O2PGN......................................................................735.4—H2O2........................................................735.5PGNPGN..............................