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