ovivo ewt tracvac sludge collector
Post on 27-Dec-2015
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EWT™ Trac-Vac® Sludge Collector Versatile sludge removal system for new and existing clarifiers
How we create value
• Lowcostrapidinstallationinafractionofthetimerequired by alternate systems
• Flexibleretrofitsolutionsreducecapitalcosts• Suitableforanyrateandvariabledepositionpatterns• Reducedmaintenancerequirements
and costs
Key features & benefits
• Lowprofileidealforimprovingplatesettlerperformance
• Variable,programmablecontrols• Modularcomponents• Robustdrivemechanism–withstandseven
indefinite stall• Externalcabledrivesystemsavailable• Airspargerforairscouravailable• UniqueTrac-VacExtractor
TractorBody
GuideRail
AirUmbilical
SludgeHose
SuctionHeaderPipe
AirSparger
QuickReleaseClamps
Versatility,reliabilityandeconomymakeOvivo’sTrac-Vac®technologythelogicalchoiceforcost-effective solids removal. Hundreds of units installed in newandexistingclarifiershaveearnedareputationamongstengineers,operatorsandadministratorsforflexibilityofdesign,easeofinstallationanddependableoperation.
PneumaticallydrivenTrac-Vaccollectorsremovesolids from sedimentation basins by means of suction,generatedthroughdifferentialhead,orpumping.Keycomponentsarecorrosionresistantandofmodulardesign,ensuringlongservicelife.
Features and Benefits
TractorPropulsionissuppliedbyahighlyreliable,all-pneumaticdriveassembly,requiringaminimum90PSIGairsupply.Lessthan2CFMisconsumedatnormaloperatingspeedsof6”to2’perminute.Alldriveassemblymaterialsarecorrosion-resistantandthetractorishousedinstainlesssteel.Ifthetractor’spathisblocked,thedrivemechanismcanwithstandanindefinitestallwithoutdamage.Alocaterjetestablishestheunit’spositionwithouttheuseoftrailingfloats.
EWT™ Trac-Vac® Sludge Collector
External Cable Drive SystemsIfanexteriordrivesystemisrequired,anexcellentcabledrivesystemisalsoavailable.Apneumaticorelectricdriveismountedonthebasinendwall,abovethewaterline.Stainlesssteelcablesareusedtomovecollectorunitsacrossthebasinfloor.Tapedrivesystemsrequireaminimum90PSIGclean,dry,oil-freeairsupply.Eitherasludgepump(forpumpedsludgewithdrawal)orapneumaticorelectricsludgevalve(forgravitysludgeremoval)maybeused.Gravitysludgeremovalrequiredaminimum5foothead.
Suction Header PipeLengthanddiameterofthestainlesssteelheaderpipeandthesizeandnumberofsuctionorifices aredeterminedbytheapplication.
Air SpargerAnoptionalairspargesystemprovidesairscour cleaningforinclinedplatesettlingdevicesabove theTrac-Vacunit.
Sludge HoseDurable,UVresistant,highdensitypolyethylenehosecarriessludgeawayfromthetractorunit.Hosesaresmoothontheinteriorandribbedontheoutsideforflexible.
PerformanceFeaturesandOptions
EWT™ Trac-Vac® Collectors installed withEWT™FlexKlear™PlateSettlers
Guide RailTubularstainlesssteelrailsguidetractorunitsthroughthebasin.Interlockingsectionsareeasilytransportedandassembled.
Air UmbilicalAirsupplylinesbetweenthelocalpneumaticpanelandthetractorareenclosedinaprotectivesheath,manufacturedfromthesamehighdensitypolyethyleneasthesludgehouse.
Quick Release ClampsStainlesssteeltoggleclampsallowfaster,moreconvenientremovalandreplacementofhoses thanscrewtypeclamps.
EWT Trac-Vac ExtractorThetractormechanismrequiresonlyinfrequentservicing.Whenitdoes,Ovivo’sexclusiveTrac-Vacextractorliftstheunitoutofthebasinforeasyaccessmaintenance,withoutdrainingthebasin.Whenservicingiscomplete,thetractorisquicklyreinsertedandindexedagainsttheguiderail.
Low ProfileThelow-profileTrac-Vacunittravelsbeneathplatesettlers,makingTrac-Vacsludgecollectorsanidealmeansofimprovingplatesettlerperformancebyremovingaccumulatedsolidsfromunderneathlaminar settling devices. Collection can be easily tailoredtosuitanyrateandpatternofdeposition.
Control PanelsAprogrammableelectroniccontrollerdirectsthecollectorunitsandactivatedsludgevalvesorpumps.Airflowismanagedthroughaninterfaceofelectricallyactivatedsolenoidvalves.Asinglecontrolpanelcanoperateasmanyasfiftycollectorunitsandassociatedvalvepanels.AllcabinetsareconstructedofanodizedaluminumandmeetNEMA-4specificationsforoutdoorservice.Theprogrammablecontrolunitallowsflexibilityinthepatternsofsolidscollectionavailabletoplantoperators.Byvaryingcombinationsoftractorspeed,shortorlongtripandone-wayorround-triptravel,acustomizedsludgeremovalprogrammaybeestablishedforeveryclarifier.
Modular ComponentsLightweight,modularconstructionhelpstokeepinstallationcostsdown,withinstallationtakingafractionofthetimeofthatrequiredforcompetingsystems.ModularcomponentsalsoallowsimpleTrac-Vacinstallationinanyexistingclarifierbasin,whethersquare,circularorrectangular,withoutcostlyconcretemodifications.Allcomponents oftheTrac-Vacsystemarelightenoughtobecarriedintothebasinbyasingleman.
Programmable controls solve tough settling problems for Louisville, ColoradoOperatorsatLouisville’swatertreatmentplantface aproblemthatothersmightfindenviable.
Turbidityofinfluentwaterissolow(normallyless than1NTU)thatsettlingthosesolidsthatdoexistisextremelydifficult.Theirsolutionhasbeentostockpilesludgefromtheclarifiersandrecycleittotheflocculator.Thisachievesturbiditiesinexcessof1000NTU,allowingexcellentflocformationandgoodpolishingperformancefromtheclarifiers.Periodically,awastecyclesendsexcesssolidsbacktotheclarifierwhichthenfunctionsasathickener,withflowfromthesludgecollectorsdischargedtothemunicipalwastewatersystem.Successfuloperationisdependentonthesludge removal system accommodating fluctuating solids loadingandchangingpatternsofdeposition.Toachievethis,ourengineersprogrammedTrac-Vaccontrolstoprovideseveraldifferentcollectionmodes.
Innormaloperationwithsolidsrecycling,collectorsrunshorttripsstartedbyaclockinthecontroller,withonelongtripinevery24hourperiod.Duringwasting,collectorsruncontinuouslyinalternatinglongandshorttrips.Operatorscanalsoselectjustlongorshorttrips tocoveranydepositionpatternthatmayoccur.
Tailored Retrofit for Challenging Wastewater Treatment Basin at Roanoke, AlabamaAtailoredretrofitsludgecollectionsystemwasinstalledforthechallengingbasinatRoanoke.
Trac-Vacunitswereinstalledonconvergingrails,meetingattheupperendofthesloping,wedge-shapedbasin.Theconnectingsludgecollectionpipewassupportedbyacustom-builtstainlesssteeltruss. Athird,pivotingcollectorwasinstalledinacircular rail,replacingaconventionalrakesystem.
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100.GG.1014.092010
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