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两级AO及其组合工艺在污水处理中的应用.docx

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两级AO及其组合工艺在污水处理中的应用 Title:ApplicationofTwo-StageAOandItsCombinationProcessinWastewaterTreatment Introduction: Wastewatertreatmentiscrucialformaintainingasustainableenvironment.Itinvolvestheremovaloforganicandinorganicpollutantsthroughvarioustreatmentprocesses.Advancedoxidation(AO)processesarewidelyimplementedinwastewatertreatmentplantstoeffectivelydegradepersistentorganicpollutants.OnesuchAOprocessisthetwo-stageAO,whichcombinesdifferentoxidantstoenhancethetreatmentefficiency.Thispaperaimstodiscusstheapplicationofthetwo-stageAOprocessanditscombinationwithothertreatmenttechnologiesinwastewatertreatment. 1.Two-StageAOProcess: 1.1PrinciplesofTwo-StageAO: Thetwo-stageAOprocessconsistsoftwoprimarysteps:thefirststageinvolvestheproductionofhydroxylradicals(·OH),andthesecondstageutilizesthesehydroxylradicalstooxidizeorganicpollutants.Inthefirststage,variousoxidantssuchasozone(O3),hydrogenperoxide(H2O2),andultraviolet(UV)lightareusedtoproduce·OHradicals.Theseoxidantsreactwithwatermoleculestogenerate·OHradicalsthroughdifferentmechanisms,includingdirectphotolysisandindirectreactions.Inthesecondstage,generated·OHradicalsoxidizeorganicpollutantsintosimplerandlessharmfulsubstances. 1.2AdvantagesofTwo-StageAO: -Enhancedtreatmentefficiency:Thecombinationofdifferentoxidantsinthetwo-stageAOprocessincreasestheproductionof·OHradicals,leadingtomoreeffectivepollutantdegradation. -Broaderspectrumofpollutantremoval:Thetwo-stageAOprocesscanefficientlydegradeawiderangeoforganicpollutants,includingrecalcitrantcompounds. -Lessdependencyonwastewatercharacteristics:Comparedtosingle-stageAOprocesses,thetwo-stageAOprocessislessaffectedbychangesinwastewatercomposition,makingitaversatiletreatmentoption. -Lowerenergyconsumption:Thecombinationofdifferentoxidantsallowsforbetterutilizationofavailableenergysources,resultinginreducedoverallenergyconsumption. 2.ApplicationsofTwo-StageAOinWastewaterTreatment: 2.1IndustrialWastewaterTreatment: Industrialwastewatercancontaincomplexorganiccompoundsthatarenoteas