英语文献翻译文档.docx
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英语文献翻译文档.docx
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英语文献翻译文档
Theliteraturereview(domesticandforeignresearchanddevelopmenttrendofthecurrentsituation)
1.Domesticwastewatertreatmenttechnology
1.1ABAppliedTechnologyforWastewaterBiologicalTreatment
WastewaterTreatmentTechnologyAB(theABprocess)istheadsorption-processreferredtoasbiodegradable.ABTechnologyhavedevelopedrapidlyinrecentyears,andappliedtomuchurbansewagetreatmentplants.Provedthroughpractice,ABconventionalactivatedsludgeprocessandfmethodcomparedtotheefficiency,operationstability,projectinvestmentandoperationcost,etc.allhavedistinctivefeatures.
ABtwoactivatedsludgeprocessisdividedintosegmentsAandBsection,asectionoftheadsorptionsection,Bsectionforthebiologicaloxidationsection.ABAprocesshasamajorsectionoftheaerationtankstructure,intermediatesedimentationtank,Bsectionoftheaerationtankandsecondarysedimentationtank,usuallywithoutasettlingtank,theAsectionaswellasprocessingsystem.Asegmentandthesegmenthasaseparatesludgereturnsystem,sohasitsownuniquemicrobialpopulations,isconducivetothestabilityofsystemfunctions.
ThebasicprinciplesofABProcess:
Asectionofcontinuousinoculationfromthesewersysteminthepipenetworksystemhassurvivedthenumberofbacteria,whichcanbeviewedasthedrainagesysteminthemiddleofahugereactor,inwhichalargenumberofbacteriasurviving,continuetoproliferatebutalsotoadaptto,outoftheprocessofoptimization,etc.,thusabletodevelopadaptiveandactivemicrobialcommunitiesarestrong.Thisprocessdoesnotsetasettlingtank,sothatallmicroorganismsinrawwastewaterintothesystem,sothatAsectionofabiologicaldynamicsofopensystems.
Asectionofhighload,isconducivetotheproliferationoffastgrowthandreproductionofmicroorganisms,andcanonlysurvivehereisstrongresistancetoimpactloadtheprokaryoticbacteriaandothermicroorganismscannotsurvive.Asectionofthetreatedwastewater,BODremovalof40to70percent,alsoimprovedbiodegradability,isconducivetotheworkofBsegments.
Asectionofthesludgeproductionratewashigheradsorptioncapacity,heavymetals,refractorymaterialandnitrogen,phosphorusandotherplantnutrientssuchastopassthroughthesludgeadsorption,andhavebeenremoved.
Asectiononorganicremoval,mainlybytheflockadsorption,biologicaldegradationaccountsforonlyabout1/3,duetothedominantroleofphysicalandchemicaleffects,therefore,aparagraphoftoxicsubstancesinwastewater,pH,organicloadingandtemperaturehavecertainadaptability.
SectionBSectionAofthereactionisbasedonthenormalwork,includingasectionoftheadsorptionoforganiccompoundsisveryimportant.Bsectionofthebiologicalsystemismainlycomposedoflonggenerationsofeukaryoticmicrobialcomposition,andaccordingtospecificprocessconditionschange.SectionBacceptedthebasicstabilityofwaterqualityandquantitiesare,almostwithoutregardtotheimpactload,togivefullplaytopurification.Asectionofthefunctionwiththeadditionofnitrogen,BOD/Nvaluedecreased,therefore,Bsegmentwiththenitrificationprocessconditions.
1.2SBRBiologicalTreatmentforWastewaterApplications
Sequencingbatch(intermittent)activatedsludgeprocess(SequencingBatchReactor),referredtoastheSBRinrecentyearswidespreadattentionathomeandabroadisthegrowingnumberofnuclearresearchofawastewatertreatmentprocess,andanumberofproductionunitsarealreadyinoperation,witharangeofbetterthanconventionalactivatedsludgecharacteristics.
Atpresent,SBRprocessismainlyusedinurbansewageandindustrialwastewater(mainlyMSG,beer,pharmaceuticals,coke,food,paper,printinganddyeing,washing,dressing,etc.)processing.
SBRprocessisacertainorderbytheintermittentoperationoftheSBRreactoroperationcomposed.SBRprocessacompleteoperation,thateachSBRreactoroperationwhenthewastewatertreatment,includingfivephases:
fill,reaction,sedimentation,water,idle.SBR'smethodstointermittentoperationoftheoperatingconditionasthemainfeature.
SBRprocessoperationandconvenientoperation,thereactorisindescendingorderinspace,intermittent;intimeisarrangedinsequence,andintermittent.
1.3ApplicationsforWastewaterBiologicalTreatment
Sincethe70softhe20thcentury,peopleintheanaerobic/aerobicphosphorusremovalsystemandtheanoxic/aerobicnitrogenremovalsystembasedontheprinciple,alsoproposedsewagetreatmentsystem,willcombinethetwosystems,thesewagethroughanaerobic(Anaerobic),anoxicandaerobic(Anoxic)andaerobic(Oxen)threebiologicaltreatmentprocesses(referredtoas
/O),toachievesimultaneousremovalofBOD,nitrogen,phosphoruspurposes.Theprimaryfunctionsofanaerobicphosphorusrelease,whilepartoftheorganicmatterammonification.Theprimaryfunctionofanoxicdenitrification,nitrateisthroughtheinnerloopsentbytheaerobicreactor,amixtureofalargeamountofcirculating,usually2Q(Q-rawsewageflow).Aerobicstageismultifunctional,removeorganicmatter,phosphorusdigestionandabsorptionofotheritemsarereflectedinthisparagraph.Thesethreereactionsareimportant,themixturecontainingNO3-N,thesludgecontainingexcessphosphorus,ThewaterintheBOD(orCOD)removalwereobtained.2Qmixtureflowbackfromtheanoxicreactorhere
1.4Theconventionalactivatedsludgebiologicalwastewatertreatment
Conventionalactivatedsludge,alsoknownashabitorknowntraditionalaerationactivatedsludge,wasthefirstuseofasludgemethod.
Inthenormaloperationoftheconventionalactivatedsludgeaerationtank,theaerationtankQiduan,returnactivatedsludgewithboilingwateroncefullymixed,activatedsludgefromwastewaterinalargenumberoforganicmatter.SincethenF/Misrelativelyhigh,sothegrowthrateofmicrobialgrowthgenerallyincreasedinthelatestagesofdeclineorgrowthrateofstage.Astheorganicmatterintheaerationtankmixedliquorcontinuouslyalongthelengthoftheoxidationpondandthecontinuoussynthesisofmicrobialcells,continuetolowertheconcentrationoforganicmatterinwater,F/Mbecomesmallerandsmaller,totheendofthepond,thegrowthofmicroorganismshaveenteredtheendogenousmetabolismperiod.Becausetheconventionalactivatedsludgeaerationtimelonger,youcanmoreorganicadsorptionandpurification,andtheaerationtankeffluentspeciesofmicroorganismshaveenteredtheendogenousmetabolismof,theiractivitieshaddiminishedcapacity,easytoprecipitateinthesedimentationtank.Afterthewastewaterintothesedimentationtank,wherealmostallorganicmatteris"eaten"bythestorageofmicrobialcellsbecomedepletedofmaterial,whichishungryactivatedsludgeactivityhasbeenfullyrestored,backtotheaerationtankAfteragoodadsorptioncapacityandoxidationoforganicmatter.Sotheconventionalactivatedsludgeprocessofbiochemicaloxygendemandandsuspendedsolidsremovalefficiencywasveryhigh,about90to95percent.Achievethishighremovalefficiency,commonlyknownas"fulltreatment."Ifyoudonotneedsuchhighprocessingrequirements,toreducetheamountofreturnsludgeandshortentheaerationtime,theso-called"partofthedeal."
1.5Applicationofoxidationditchtechnologybiologicalwastewatertreatment
Activatedsludgeoxidationditchisavariant,theaerationtankditchesthatwereclosedtype,themixtureofsewageandactivatedsludgeinwhichthecycleofcontinuousflow,therefore,alsoknownasthe"ringaerationPool","Noendoftheaerationsystem."Crushedoutofwoodiswidelyusedintheoxidationditchtypesinclude:
PascalWeil(Passover)oxidationditchandCarrousel(Carrousel)oxidationditch,Auber(Orbal)oxidationditch,T-typeoxidationditch(coxidationditch),DE-typeoxidationditchoxidationditchandintegration.
1.5.1Carrouseloxidationditch
CarrouseloxidationditchistheDHVfromtheNetherlandsin1967,thecompanydeveloped.Carrouseloxidationditchintheoriginalbasis,DHVCompanyandtheUnitedStatespatentlicensingcompanyhasinventedaCarrousel2000EIMCOsystemtoachieveahigherdemandforbiologicalnitrogenandphosphorusremovalcapabilities.
Carrouseloxidationditchaerationandagitationdevicesusingdirectional,relativetothelevelofthemixturespeedofdelivery,sothatthemixturewasstirredintheoxidationditchcirculatingwithintheclosedchannels.Therefore,oxidationditchhasaspecialhydraulicflowpattern,bothcompletelymixedreactorcharacteristics;thereareplug-flowreactors,thecharacteristicsoftrenchobviousdissolvedoxygenconcentrationgradient.Oxidationditchwithrectangularortrapezoidalcrosssection,flatshapeoftheoval,thetrenchdepthisgenerally2.5to4.5meters,widthtodepthratioof2:
1,hasawaterdepthof7m,theaveragespeedofwaterflowinditch0.3meterpersecond.Mixedoxidationditchaerationequipmentsurfaceaerators,aerationthebrushorwheel,jetaeratorconduitandriser-typeaeratorandsoon,thereiswaterinrecentyearswiththeuseofthrusters.
1.5.2Orbaloxidationditch
Orbaloxidationditcharegenerallycomposedofthreeconcentricovalchannel,waterchannelfromtheoutsidetoenter,andreturnsludgemixtureintothemiddleofthechannelfromtheoutsideandthenintothechannelwithinthechannel,thenthechanneltoloopuptotensofhundredsoftimes.Finally,theadjustableweirflowsbytheCenterforthedooroutoftheisland,andtothesettlingtank.Installedineachchannelhaveadifferentnumber
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