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MixinginWWTPMixingDutiesWhatisthejobofthemixerinWWTP?Whatisthereasonmixingisneeded??PreventsettlingofsolidsinaliquidKeepthebottomfreefromsedimentsKeepthesolidsinahomogeneoussuspensionMixingDuty:SuspensionDrawdownofsolidsfromsurfacee.g.ParticleslighterthantheliquidMixingofmiscibleliquids/EliminationofconcentrationdifferencesSpecifieddegreeofhomogeneitySpecifiedmixingtimeMixingInflowBatchMixingMixingDuty:BlendingTransportofliquid&matterLiquidtransportintoandoutofaeratedzonesMixingDuty:CirculationMixingDutiesinWWTPSandgritsControllevelofsuspensionKeepsludgeinsuspensionAllowsandtosettleMechanicalTreatmentEqualisation&RetentionbasinsKeepsolidsinSuspensionIntakepumpstation/LiftingstationKeepbottomcleanDraw-downoffloatingwasteIntaketoWWTPMixingDutiesinWWTPBiologicalTreatmentAnaerobiczonesKeepactivatedsludgeinsuspensionMixinflowAnoxiczonesKeepactivatedsludgeinsuspensionMixinflowMixingDutiesinWWTPBiologicalTreatmentAeratedtanksKeepactivatedsludgeinsuspensionCirculateliquidoveraeratedzonesSBR(SequenceBatchReactors)
MixersandaerationworkalternatingKeepactivatedsludgeinsuspensionMixinflowMixingDutiesinWWTPFlashmixingMixingchemicalsintosludgeGivenhomogeneityandtimeChemicalTreatmentFlocmixingSuspensionGentlycirculationtoachieveflocculationMixingDutiesinWWTPSludgeTreatment/HandlingMixing/collectingtanksMixinginflowsKeepsludgehomogeneousDigestersKeepsludgehomogeneousThickening/StoragetanksKeepsludgehomogeneousTheProducts:FlygtMixers“Bananablade”mixers“Compact”mixersCompactmixersCompactStainlesssteeldesignSmall/mediumsizediametersDirectdriven(multi-pole)FlexibleinstallationonGuidebarsEasyaccessibleforinspection&serviceSuitableforalltankshapesandsizes4600-series46104620463046404650466046704680BananaBladeMixersLargediameter&slowspeedGeardrivenSuperiorefficiency=
LowpowerconsumptionCorrosionresistantcoatingGuidebarsinstallationSuitableforlargertanksofallshapes4410/4430-series44104430InstallationSystemsSingleGuidebarsystemThemostcommonlyused.Allowsveryflexiblepositioningforalmostanytank.ThemixercaneitherbehangingonachainorwirerestingonasupportbeamLiftingdavitsareavailable.InstallationSystemsTripodGuidebarsystemMainlyforthebananablademixers,wherethetorsionloadsaregreater.Canalsobeusedforthe4600series.DoubleGuidebarsystemSpeciallydesignedforthebananablademixers.InstallationSystemsCantileversystemCanbeusedforthe4610and4620mixers.Areavailableupto3mlength.BottommountingsystemCanbeusedforthe4610and4620mixers.UsingFlygtMixersinWWTPAnoxiczonesAeratedtanksSludgeHandling/StorageAnoxicZonesNoaerationequipmentintankMixingisneededfor:SuspensionMixinginflowsCommontankshapesAnoxicZonesforBNRO2ReturnActivatedSludgeInternalRe-circulationWasteActivatedSludgeInflowAnoxiczoneAerobiczoneSedimentationBNR-BiologicalNitrogenRemovalAnoxicZones-SelectingMixersTanksSizeandShapeVolumetomixLossesduetogeometryKeepsludgeinSuspensionMixinflowsMixingRequirements+=RequiredPerformance(Thrust[N])???CustomerPreferencesInvestmentLCCOperation&Maintenance+AnoxicZones-SelectingMixersExample1:Anoxiczone-Smallrectangulartank10m6m3mSR4410 Prop.=1.8m&18rpm
Pcons=0.6kWSR4630 Prop.=7°(w.Jetring)
Pcons=1.3kWAsimplifiedLCC:Investment+Energycostover5yearsAnoxicZones-SelectingMixers20m10m6mSR4410 Prop.=2.2m&25rpm
Pcons=1.4kWSR4650 Prop.=7°(w.Jetring)
Pcons=4.8kWAsimplifiedLCC:Investment+Energycostover5yearsExample2:Anoxiczone-LargerectangulartankAeratedTanksAerationequipmentcoverpartoralloftankbottom.Mixingisneededfor:SuspensioncirculationCommontankshapesAeratedTanksPartialbottomcoverageSuspensionCirculationofliquidoveraeratedareasFullbottomcoverage(SBR)SuspensionwhenaerationisturnedoffMixers&AerationneveroperateatthesametimeAeratedTanks-SelectingMixersExample:Racetrackwithbottomdiffusers2xSR4430
Prop.=2.5m&35rpm
Pcons=6.9kW(tot)2xSR4660
Prop.=15°(w.Jetring)
Pcons=18.9kW(tot)Sizingisbasedon:Size&geometryoftankAerationRequiredvelocityInvestment+Energycostover5yearsAeratedTanks-SelectingMixersLargetanksEnergyefficientLargevolumeCirculationSmallertanksWheninstallationmightbedifficultSludgeHandling/StorageSludgewithDS>1%upto10-15%Mixingisneededfor:MixinginflowsPreventstagnantareaskeephomogeneousCommontankshapesSludgecharacteristicsHighconcentrationHighviscosityIncreasedpowerconsumptionHigh“yieldstress”stagnantzoneswithtoosmallmixersMixingSludgeToosmallmixerstagnantzonesSludgeHandling-SelectingMixersNotsuitableforsludgemixingLargerinvestmentLowerpowerconsumptionBettercoolingofmotorathighviscositysmallerinvestmentHigherpowerconsumptionSuitablewhenriskofcloggingWithoutJetringWithJetringSludgeH
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