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Urban sewagetreatmenttechnologyEnglishcoursewREPORTING目录•introduction•Overview of Urban SewageTreatmentTechnology•Physical processingtechnology•Biochemical treatmenttechnology•Deep processingtechnology•Sludge treatmentand disposal•Operation andmanagement ofurbansewage treatmentplantsPART01introductionREPORTINGThe Sourceof UrbanSewageResidential wastewater01Coming fromresidential areas,containing detergents,soaps,and otherpollutants.Commercial wastewater02Generated fromcommercial activities,including restaurants,hotels,hospitals,etc.It containsgrease,oil,and otherpollutants.Industrial wastewater03Generated fromindustrial productionprocesses,containing avarietyof pollutantssuch assuspended solids,dissolved solids,heavy metals,and organic matter.The NecessityofUrbanSewage TreatmentEnvironmentalprotection01Treating urbansewage can reduce thepollution ofwaterbodies andprotect theecological environment.Public health02Treating urbansewage canremove pathogenicbacteriaand viruses,reducing therisk ofwater-borne diseases.Water reuse03Treating urbansewage canmake waterclean andsafe forreusein irrigation,industrial cooling,and otherpurposes.PART02Overview ofUrbanSewage TreatmentTechnologyREPORTINGTheBasic Processof SewageTreatmentInlet PretreatmentPrimary TreatmentRemovalof largesolids andfloating Sedimentationof heaviersolids todebrisfrom rawsewage.remove about30%of the organicmatter.Secondary TreatmentTertiary TreatmentBiologicaltreatment usingAdditional treatmentsteps that maymicroorganisms toconsume organicinclude filtration,disinfection,andmatter andconvert itinto harmlessby-nutrient removal.products.The MainMethods of Sewage TreatmentConventionalSewage TreatmentTypicalprimary andsecondary treatmentmethods.Advanced SewageTreatment ASTEnhancedmethods thatprovide bettereffluent quality,including nutrientremoval anddisinfection.PhytoremediationUse ofplants and their associatedmicroorganisms forwaterpurification.Constructed WetlandsSimulatednatural wetlandsfor wastewater treatment.Selection Criteriafor SewageTreatmentTechnologyRegulatory RequirementsCostMeeting dischargelimits andCapital andoperational costsofeffluent standards.the technology.Energy ConsumptionEnvironmental ImpactTheamount ofenergy requiredThe impacton theenvironmentfor theoperation of the duringoperation,sludge disposal,treatment system.and waterreuse potential.PART03Physical processingtechnologyREPORTINGSedimentationTechnologySedimentation BasicsSedimentationis anatural processin whichsolid particlesin watersettle tothebottom.This technologyuses thisprinciple toremove solidsfrom wastewater.AdvantagesSimple andcost-effective.It canhandle largevolumes ofwater.DisadvantagesEfficiency dependson particlesize anddensity,and maynot removeallsuspended solids.Filtration TechnologyFiltrationPrinciplesFiltration usesa porousmedium totrap particles,removing solidsand somedissolved pollutants.Types ofFiltrationInclude sandfiltration,membrane filtrationmicrofiltration,ultrafiltration,nanofiltration,reverseosmosis.ApplicationsPrimarily usedfor drinkingwatertreatmentandindustrial wastewater.Separation TechnologySeparationElectrocoagul CentrifugatioFlotationMethodsation nIncludeflotation,A processin whichUses electricityto Usescentrifugalelectrocoagulation,air bubblesattach tocreate chargedforce toseparateand centrifugation.suspended particles,particles thatsuspended solidsliftingthem tothe coagulatewith fromwater.surface wherethey pollutants,causingcan be removed.them tosettle orfloatfor removal.PART04Biochemicaltreatment technologyREPORTINGActivatedSludge Process总结词详细描述The activatedsludge processis acommon Inthe activatedsludge process,wastewater ismethodof treatingwastewater,using mixed with microorganisms and air,forming amicroorganisms to breakdown organic matter.suspension ofmicroorganisms calledactivatedsludge.The microorganismsconsume theorganicmatter in the wastewater,converting itintocarbon dioxide,water,and newmicroorganisms.The activatedsludge isthenseparated fromthe cleanedwater.Biofilm Method要点一要点二总结词详细描述The biofilmmethod involvesthe use of fixedbiofilms Inthe biofilmmethod,microorganisms attachtoto treatwastewater.surfaces ina reactorand forma biofilm.Thewastewater flowsthrough thereactor,and themicroorganisms in thebiofilm consumetheorganicmatterin thewastewater.The cleanedwater isthendischarged,while thebiofilm remainsattached tothereactor surface.Anaerobic BiologicalTreatment Technology总结词详细描述The anaerobicbiological treatmenttechnology Inthe anaerobicbiological treatmenttechnology,uses anaerobicmicroorganisms tobreakdown thewastewater ismixedwithanaerobicorganic matterin wastewater.microorganismsinan anaerobicreactor.Themicroorganisms breakdown theorganicmatterinthe wastewaterinto methane,carbon dioxide,andother byproducts.The cleanedwater isthendischarged,andthemethane canbe recoveredforenergy use.PART05Deep processingtechnologyREPORTINGDisinfectionTreatment•Summary:Disinfection treatmentis essentialtoeliminate pathogenicmicroorganismsandensurewater quality.Disinfection TreatmentDetailsCommondisinfection methodsinclude chlorination,ozonation,and UVirradiation.Chlorination isthe mostwidely usedmethod,but itmay produce harmfulbyproducts.Disinfection TreatmentOzonationis effectiveagainst awiderange ofmicroorganisms,but itis expensive.UV irradiationis aphysical methodthatdoes notproduceharmfulbyproducts,but itrequires a highinitial investment.Nitrogen andPhosphorus RemovalTechnology•Summary:Removing nitrogenand phosphorusiscrucial toreduce eutrophicationand improvewaterquality.Nitrogen andPhosphorus RemovalTechnologyDetails Denitrificationis acommon methodtoremove nitrogen,using anaerobicbacteria toconvertnitrate intonitrogen gas.Phosphorus canberemovedby chemicalChemical precipitationinvolves addinglimeprecipitation orbiological removalmethods.or alumto precipitatephosphorus,whilebiological removaluses microorganismstoabsorb anddegrade phosphorus.Advanced OxidationTechnology•Summary:Advanced oxidationtechnology isused todegraderefractory organicpollutants andremoveharmful substances.Advanced OxidationTechnologyDetailsAdvanced oxidationprocesses includeozonation,UV/H2O2,andphotoelectrochemical oxidation.Ozonation candegrade organicpollutants,but itmay produceharmful byproducts.Advanced OxidationTechnologyUV/H2O2uses UVlight andhydrogen peroxidetogenerate hydroxylradicals for oxidation,but itrequiresa highenergy input.Photoelectrochemical oxidationuses semiconductorstogenerate electronsand holesforoxidationandreduction reactions,respectively.PART06Sludge treatmentanddisposalREPORTINGThe Sourceand Characteristicsof SludgeSludgeis aby-product of wastewater treatmentprocesses,mainlycomposed oforganicmatter,suspended solids,andmicroorganisms.The characteristicsof sludgevary dependingon thesource ofthewastewater andthe treatmentprocess used.Sludge maycontain pathogenicbacteria,viruses,heavy metals,and otherharmful substances.Treatment Methodsfor SludgePhysicaltreatmentThis methodinvolves separationof solidand liquidfractions,thickening,dewatering,and stabilizationofthe sludge.Chemical treatmentTheuse ofchemicals suchas lime,ferric chloride,orpolymers toimprove sludgesettling,dewatering,andstabilization.Biological treatmentThis method usesmicroorganismstodegrade organicmatterinthesludge,reducing itsvolume andimproving itsstability.Disposal andUtilization ofSludge要点一要点二要点三Landfill disposalAgricultural ThermaldisposalutilizationThe sludgeis transportedto aThe sludgeis appliedto farmlandThe sludgeis incineratedat highlandfillsite fordisposal.This asa fertilizer,providing nutrientstemperatures todestroy organicmethodis简便,but maycause toplants.However,thesludgematter andreduce thevolume ofpollutionand odorproblems.must bewell-treated toensure thesludge.Thismethodrequiressafety.ahighenergy inputand mayemitharmful gases.PART07Operation andmanagementofurban sewagetreatmentplantsREPORTINGOperation ModeofSewageTreatment PlantCentralizedDecentralized CombinedTreatmentTreatment TreatmentThis mode involvesthe collectionAlso knownas on-site treatment,Thismodecombines centralizedofsewage fromvarious sources,this modetreats sewageat itsand decentralizedtreatment.It istransportingit toa centralsource,usually individualsuitable forlarge urbanareaslocation,and treatingit there.It isdwellings orsmall communities.It whereboth centralizedandthe mostcommon modeand issuitable forscattered dwellingsdecentralized sewagetreatmentsuitable fordense urbanareas.or remoteareas.plants arerequired.Energy EfficiencyManagement ofSewageTreatment PlantsEnergy-saving BiologicalProcesses EnergyRecovery RegularMaintenanceEquipmentUsing energy-efficient Theuseofbiological Capturingenergy fromRegular maintenanceandequipment suchas pumps,processes insewage biogasgenerated duringservicing ofequipment canblowers,and mixerscan treatmentcanreducethe anaerobicdigestion ofensure optimalreduceenergy consumption.energy requirementssewage canbe usedfor performanceand reducecomparedto physicalor generatingelectricity orenergy losses.chemical processes.heating.Environmental Regulationsand StandardsforSewage TreatmentPlantsWater QualityStandards:Emission Standards:Waste Management:Permits andApprovals:Plants mustmeet set Plants mustadhere tosetPlantsmust haveproper Operatinga sewagewaterquality standardsto limitson emissionsofwastemanagement treatmentplant requiresensuretreated wateris gases,solids,and otherpractices inplace toobtaining necessarysafefor dischargeinto materialsthatmayhandle solidwaste,permits andapprovalsthe environment.contaminate thesludge,and otherfrom regulatoryatmosphereduring materialsgenerated authoritiesto ensuretreatment.during treatment.compliance withenvironmentalregulations.THANKS感谢观看REPORTING。