towards advanced aeration modelling from blower to bubbles to bulk 2016 andreia amaral资料.pdf

该【towards advanced aeration modelling from blower to bubbles to bulk 2016 andreia amaral资料 】是由【小舍儿】上传分享，文档一共【11】页，该文档可以免费在线阅读，需要了解更多关于【towards advanced aeration modelling from blower to bubbles to bulk 2016 andreia amaral资料 】的内容，可以使用淘豆网的站内搜索功能，选择自己适合的文档，以下文字是截取该文章内的部分文字，如需要获得完整电子版，请下载此文档到您的设备，方便您编辑和打印。:..UncorrectedProof1?IWAPublishing2016WaterScience&Technology|inpress|2016Towardsadvancedaerationmodelling:fromblowertobubblestobulkAndreiaAmaral,OliverSchraa,LeivRieger,SylvieGillot,YannickFayolle,oBellandi,YouriAmerlinck,.,ardoGori,RamiroNevesandIngmarNopensABSTRACTponentofaerobicbiologicalwastewatertreatmentandisthelargestAndreiaAmaral(correspondingauthor),theblowers,airpiping,anddiffusersareIngmarNopenspletely-mixedreactorsinseriesareusedtorepresentplug-?owreactors,BIOMATH,DepartmentofMathematicalModelling,StatisticsandBioinformatics,andempiricalcorrelationsareusedtodescribetheimpactofoperatingconditionsonbubbleGhentUniversity,CoupureLinks653,Gent9000,formationandtransport,,theBelgiumE-mail:andreia.******@?,ico,pilesrecenteffortstodevelopphysicalmodelsoftheentireaerationsystemUniversidadedeLisboa,(blower,valves,airpipinganddiffusers),aswellasaddingrigourtotheoxygentransferef?,1,Lisboa1049-001,Portugalmodelling(impactofviscosity,bubblesizedistribution,shearandhydrodynamics).AsaresultofOliverSchraathesemodelextensions,morerealisticpredictionsofdissolvedoxygenpro?lesandenergyLeivRiegerinCTRLSolutionsInc.,,thecurrentneedsforfurthermodeldevelopmentare470AnthonyDrive,Oakville,ONL6J2K5,|aeration,airdistribution,putation?uiddynamics,oxygenSylvieGillotIrstea,URMALY,centredeLyon-Villeurbanne,transfer,populationbalancemodel5ruedelaDoua,VilleurbannecedexF-69926,FranceYannickFayolleIrstea,URHBAN,centred’Antony,1ruePierre-GillesdeGennes,AntonycedexF-92761,FranceoBellandiardoGoriDepartmentofCivilandEnvironmentalEngineering,UniversityofFlorence,,3,Florence50139,ItalyINTRODUCTIONuratelypredictingcontrolsystemperformance,energywastewatertreatment(Garcia-Ochoa&Gomez????)butconsumption,andthebehaviorofshortcutnitrogenremoval-processessuchasnitriteshuntnecessitatesmoredetailedparedtothelevelofdetailincludedinstate-of-the-artaerationsystemssubmodels(Benedettietal.????).Thesub-ic(Amerlinck????)-modelsservetwoobjectivesbothdrivenbypracticalneeds:lingobjectivesforaerationatwaterresourcerecovery(i)toincreasetheunderstandingoftheunderlyingmechan-facilities(WRRFs)arechangingastheindustrystrivesforismsand(ii)toimprovethepredictivecapabilitiesoftheimprovedcontrol,energyef?(Figure1),doi:.365:...|TowardsadvancedaerationmodellingWaterScience&Technology|inpress|2016plexinter-,,RESULTSANDDISCUSSIONFromblowertobubblesFigure1|Asimpli?edschematicdiagramofatypicalWRRFaerationsystem().pressedairusingblowersthatforceairthroughsupplypipesthatfeeddiffuserssub-(oroxygen)mergedintheaerationtanks(Figure1).Theloadtoandthesupplysideandthedemandside,isessentialinviewoftemperatureinWRRFvariesthroughoutaday,week,orthedesign,optimisationandcontrolofWRRFs,,aera--?owtanksleadtoanunevenloadourconjecturethatthecurrentsimpli?edapproachtomod-,aerationtanksbuiltpletelystirredtankreactorsneveractuallybehaveasaerationtanksareoperatedatlowdissolvedoxygen(DO)suchandshowdiscrepantairdistribution,especiallyconsider-concentrations(,nitrite-shunt,controlstrat-ingthedistributionpatternoftheaerationsystemandtheegiesbasedonNH4/NO3concentrations,etc.),?,theaerationsystemhastobeequippedwithsensors,Energyoptimisationstudiesalsorequirerigorousmodellingactuators,andadvancedaerationcontrolsystemsforbothairofaerationsystemsasbloweref?,,thedevelopmentsreceivedincreasedattentionandledtothedevelopmentofpresentedhereaimtodevelopsolutionsforthesecases,butverydetailedsubmodelsonaphysicalequipmentlevelobviously,theycanalsobequiteusefultoanalyseandopti-(al.????;Schraaetal.????,????).OtherThispaperdiscusseswhymoredetailedaerationsystemresearchfocusedondevelopingbettersubmodelstopredictsubmodelsarerequiredandwhytheimbalancebetweentheenergyconsumptionoftheaerationsystems(Amerlincklevelsofdetailinthevarioussubmodelsisacriticalpro-etal.????).Infact,,demandsidetariffs(Aymerichetal.????)-urateandfullydynamicenergypredictionsforrea-,leadingBlowers,worksanddiffusersaredescribededgeresearch,andgapsintheunderstandingofaerationseparatelybelowbutitshouldbekeptinmindthattheprocesses.-,apressionusingblowers,airdistributionusingpipesandchangeofavalvepositioncanhaveasigni?cantimpactcontrolvalves,introductionofairbubblesintotheaerationontheef?,-linglevel,theoxygentransferisimpactedbyseveralcriticalProcessdescriptionfactorswhichcurrentlycanonlybedescribedinanempiri--Twomaintypesofblowersaretypicallyusedinwastewatergoingeffortsthataimtoimprovethemodellingofthetreatment:(i)positivedisplacement(PD)blowers,and(ii):...|TowardsadvancedaerationmodellingWaterScience&Technology|inpress|,butarelessenergyef?cientthancen-trifugalblowersanddesignedforlower?-pointcontrolledbeenpublishedbySchraaetal.(????)withafocusonblowersarehighlyef??ciencyandbyAmerlincketal.(????),focusingonimprovedpredictionsoftheoverallpletemodels?energyconsumption(Figure3).TheSchraaetal.(????)modelincludesthefollowingfeatures:Firstly,blowersconsumebetween50and70%oftheoverall?SubmodelsweredevelopedtocalculateblowerprocesselectricalenergyofaWRRF(Reardon????;Rossopressureriseandef?ciencyasafunctionofair?ow&Stenstrom????)andatthesametimearethesinglerateandinletguidevanepositionandfanaf?-,thebloweref?ciencycanbepredictedina?Dynamictermshavebeenincorporatedintoalltherealisticway(seeFigure2).Thisisapre-,controllingblowersisthepartoftheaerationAmerlincketal.(????)showedthattheirdevelopeduratepredictioncurrentlyonlyademand-sidemodellingapproachistypi-(inparticularthepeakenergydemand)betterdifferentsectionsoftheaerationtanks,theaerationsystemthanconstantaveragepowerconsumptionmodels(-shootingaera-(Gernaeyetal.????))currentlybeingused.-tionsystemcontroloraligningtheaerationcontrolsystemprisesadetaileddescriptionofboththeblowertotheavailableequipment,,thedetailedsubmodelsalsoallowamoredetaileddesign,wheretheairdemandofthebiologicalpro--uncertaintyinthedesignprocess,andperhapsevenmorepliedtestingdatatoalargeextent,onlylimitedcalibrationimportantly,?|pressedairsystemandFigure3|Powerconsumptionprediction:().:...|TowardsadvancedaerationmodellingWaterScience&Technology|inpress|2016AirdistributionsystemProcessdescriptionTheairdistributionstartsatthebloweroutletsandisdesignedtodeliversuf?,theaerationsystemhastobedesignedsothatpressuredropsinthedifferentparts,,-tion,lossesdueto?ttings,bends,and?xedinstallationslike?owmetersand?nallythediffusers,whichhavethelar-|Monod-?Theairdistributionsystemincludingairpiping,?ttings,?valves,-In?rstinstance,airdistributionisahighlydynamicandmentsaremodelledusingtheDarcy–WeisbachequationinteractiveprocessandtheaerationsystemresponsecanwiththefrictionfactorcalculatedusingtheSwamee&workisJain(1976),mostWRRFssufferfromunder-orareafunctionofair?owrateandarecalibratedtoman-over--ufacturer-supplieddataorexperimentaldatawhenever,?leastheDOconcentrationisonlyavailablefromtheDynamictermshavebeenincorporatedintoallthemod-?-?,incontrasttoestablishedhighDOpro-TheresultingdynamicaerationsystemmodelwascesseswheretheDOconcentrationismuchhigherthantheimplementedinaWRRFsimulator,SIMBA#,andcanbehalf-saturationcoef?cient,inanumberofnovellowDOpro-connectedtoWRRFprocessmodelsallowingforinteractivecesses(,nitrite-shunt,-?owonNH4/NO3concentrations,etc.),theDOconcentrationisDOpro?leandthecorrespondingair?owratecontrolvalvenearlyequaltoorbelowthehalf-saturationcoef?(Figure4)?,islimitedtobench--theresolutionattheendpointin