GSE - WWTP

Tyson,FloridaWaterReclamationFacilityDesign

GreenSystemsEngineeringCorp.

MarkHain–LeadEngineerGeorgiaHawkins,BeatrizJurkewiczFreireDaSilva

ENVE332010November2014

GreenSystemsEngineering 2

TableofContentsListofTablesandFigures………………………………...……………031.0 Introduction………………………………………………..…………..04

1.1 OurCompany……………………………………..…………041.1.1OurMission……………………………………..…………041.2Tyson,FL.……………………………………….……………..041.3ProjectObjective……..…………………………………….06

2.0 Background……………………………………………………………...062.1 InfluentandStandards…………………………………...062.2 LocationofPlant…………………………………………….06

3.0 DesignofWaterReclamationPlant……………………………073.1 FlowChartandOverview……………………………….073.2 PlantProcesses……………………………………………...08

4.0 Summary………………………………………………………………….13References……………………………………………………………………..14Appendices…………………………………………………………...…….....15

A. FigureReferences………………………………...………...15B. Calculations…………………………………………..…….…16


TablesandFiguresFigure1:DevastationinTyson,FL………………………………………………………05Figure2:Tyson,FLLocation………………………………………………………………..05Figure3:WaterReclamationFacilityinTyson,FL………………………………...07Figure4:FlowChartofWaterReclamationFacility………………………………07Figure5:DiagramofWaterReclamationFacility………………………………….08Figure6:BarScreens…………………………………………………………………………..08Figure7:AeratedGritChamber…………………………………………………………...09Figure8:PrimaryClarifierwithvisibleweirs……………………………………….10Figure9:AerationBasin…………………………………………………………………...…10Figure10:AnatomyofClarifierSystem………………………………………………..11Figure11:UVLightsinwater………………………………………………………………11Figure12:CascadeAeration………………………………………………………………..12Figure13:DewateringCentrifuge………………………………………………………..13Table1:PopulationProject…………..……………………………………………………..06


1.0 Introduction1.1 GreenSystemsEngineeringGreenSystemsEngineeringisasmallsustainableconsulting,engineering,andconstructionfirmconsistingofthreeheadengineers.TheleadengineerfortheprojectisMarkHain,anenvironmentalengineeringmajorattheUniversityofGeorgia.Mark’sspecialtiesincludepublicengagementanddesign.OurtwoothermembersincludeGeorgiaHawkinsandBeatrizJurkewiczFreireDaSilva.Georgiaisanenvironmentalengineeringmajorwhospecializesinplantprocessesandorganizingthecommunity.Beatrizisalsoanenvironmentalengineeringmajorandherspecialtiesincludeenvironmentaleducationandregulations.Withtheexceptionalteamofengineersmentionedabove,GreenSystemsEngineeringisdedicatedtoensuringthatasustainableapproachismetforeachproject.1.1.1 OurMissionAsafirmwithasustainableviewofengineering,westronglyfocusonfourmajorgreenprinciplesofengineering.Weareanintegrativedesignfirmthatconsults,designs,andconstructs.Whenwewinabidforaproject,GreenSystemsEngineeringthrowsallofherresourcestowardsasustainablefinalproject.Becausewedirectlyinteractwiththecommunity,ourdesignsdirectlymeettheneedsoftheclient.Additionally,sincewedirectlyoverseetheconstructionandallsub-contractors,therearenomajormiscommunicationsbetweenthedesignandconstructionteams.Thisintegrativedesign-buildprocessbringsthecommunityastrongerserviceandlowercosts.Whenworkingonprojects,thefinaldesignshouldbedurablewhilestillreachingthedesigngoal,andshouldfitforthespecificcommunityathand.Thisensuresthatthefinalprojectwillnotbelargerthannecessary.Energyandmaterialswithinthedesignshouldflownaturallythroughprocessesandsystems,ensuringamoreeffectiveuse.Finally,materialsusedineachprojectshouldberenewableratherthandepleting.1.2 Tyson,FloridaAlthoughTyson,Floridawasfoundedin1876,itwasnamedafterthefamousNeilDeGrasseTyson,over80yearspriortohisbirthin1958.TysonhasanamazinglocationinCentralFlorida,locatedjust25minutesfromDaytonaBeachand40minutesfromOrlando.TragedystruckTysonrecentlywhenHurricaneJennadevastatedpartsofFlorida.WhileJenna’seyemissedTyson,itspawnedatornadothatdamagedmuchofthecity,includingitsinfrastructure.LuckilynooneperishedthatSeptemberafternoon.Tysonisaforwardthinkingtown,andsawthistragedyasawayofupdatingitsruinedinfrastructure.


Figure01–DevastationinTyson,FLTysonislocatedamongthebeautyincentralFloridawithnofewerthanfiveprotectedareassurroundingthetown,includingOcalaNationalForestandtheLowerWekivaRiverPreserveStatePark.Manylakesalsosurroundthispicturesquetown.OnemeasureofthedesiretoimprovetheenvironmentTysontookpriortothetragedywastobanplasticbagssoldinstores.Thiscommunitywantstohaveaninfrastructurethatmatchesitspersonality.

Figure02–Tyson,FLLocation(GoogleEarth)Theoriginalwastewaterplantwasbuiltin1978,whilethereclamationmodificationsbeganin1990.Wewanttocontinuetoimproveonthemodificationsthatbeganin1990,exceptthatwewillstartwithabrandnewfacilitythatwillbecapableofusheringTysonthroughthenext20yearsofpopulationgrowth.Table1showsourprojectionupto2035.


1.3 ProjectObjectiveTysonreachedouttoourcompanyinhopesofbuildingsustainablesystems,forwhichourcompanyisworld-renowned.Sincewehavethedrinkingwaterplantintheprocessofbeingconstructed,itwastimetodesignthewaterreclamationfacility.Thisisofutmostimportance,becausethecostofoutsourcingourwastewatertonearbycommunitieshasbeenextremelyhigh,mostlyduetotheenergyrequiredtopumpitoverthosedistances.Soonthecommunitywillbeabletoknowthatwhentheyflush,thewaterwillbetreatedsafely,locally,andreturnedtotheSt.John’sRiver,althoughmuchofthereclaimedwaterwillcontinuetobeusedbylocalgolfclubsandevenafewneighborhoodsubdivisions,justasthelastsystemdid.Although,thenewplantwillbelocatedinthesamelocationasthepreviousplant,therewillbesignificantchanges,includingmaximizingourenergyefficiency.Weknowthatenergycostsarehighforwaterreclamationplants,andthatthosecostscanvary,whichcausewaterbillstovaryfromyeartoyear.Wealsoplantocreatemoreaccesstothereclaimedwater,soevenlesswaterisputintheSt.John’sRiver.ThenextstepwillbethepublicmeetingthatwilltakeplaceonNovember10,2014.Apresentationofthematerialcoveredinthisreportwillbegivenbytheleadengineerandwillbefollowedbyaquestionandanswersessionthatthepublicisencouragedtoparticipatein.2.0 Background2.1 InfluentandStandards

Whendeterminingtheneedsoftheplantweanalyzedtheinfluentthatwouldbecomingintotheplant.Itwasdeterminedthat85%oftheinfluentwasmunicipal,whiletheother15%wasindustrialwastewater.Wetestedthiswaterinthelabsothatweknowtherequireddimensions.SeeAppendixBforcalculations.Weprojecttheinfluentwillconsistof313mg/LofBODandalmost3,900kgofsolidsperday.Weexpectthatin2035,theflowrateoftheplanttobe16millionlitersperday.Wecanbuildthefacilitythatiscapableofhandlingthisload.Wefoundthattheeffluent,ordischarge,standardsare30mg/LofBODandtotalsuspendedsolids(TSS).2.2 LocationofthePlantThelocationoftheplantwasselectedforeaseoftransition.Someofthetertiaryinfrastructure,especiallythatwhichwasburiedwasnotdamagedbythetornado.Wewantedtouseasmuchoftheexistingsystemaswecould,andthatmadekeepingthelocationoftheplantwhereithasbeenlocatedintownat1032SAmeliaAve.Allthe

Table1–PopulationProjectionTyson,FLPopulation

Year Population2000 20,9042005 24,3802010 27,0312015 30,1802025 36,8652035 43,549


distributionsofreclaimedwatershouldbereconnectedwithcapabilitiestoexpandtomoreareasofthetown.Multiplewildlifeareasaswellasnationalandstateparkssurroundthetown.Wedidnotwanttodisturbtheseareaswherewildlifecomingintotheplantmayhavebeenanissue.ThelocationcanbeseenfromaGoogleEarthimageinFigure03.

Figure03–WaterReclamationFacilityinTyson,FL(GoogleEarth)3.0 DesignofWaterReclamationPlant3.1 FlowChartandOverviewTheflowofwaterthroughourfacilityisshownbelowinFigure04.Figure05alsoshowsadiagramofmostoftheseprocesses.Thediagramalsoshowsthepathofsolids,andtheactivatedsludgeinthesystem.Inthefollowingsection,eachprocesswillbeshownanddescribedindividually.

Figure04–FlowChartofWaterReclamationFacility

CollectionofIngluentfromCommunity

PumpsLiftWatertoHeadworks

BarScreens GritChamber

PrimaryClarigier

AerationBasin

SecondaryClarigier Disinfection

Distributionofreclaimed

waterDischargeto

river


Figure05–DiagramofWaterReclamationFacility3.2 PlantProcesses3.2.1 InfluentScreensAstheinfluentcomesintotheplant,itpassesthroughbarscreens(Figure06),whichtakeoutlargeobjectsintheinfluent.Theseobjectscanthenbesenttothelandfill;although,wecouldinstallasortstationwheresomeonecouldseparateoutrecyclablematerials,butthiswouldbeacostlystep.

Figure06–BarScreens3.2.2 AeratedGritChamberAnaeratedgritchamber(Figure07)allowssolidparticles(grit)thatweretoosmalltobecollectedbythebarscreensusinggravitytosettleout.Inanaeratedchamberairispumpedintothechamberstokeeporganicmaterialsuspendedandthewastewaterfresh


whilethegritsettlesout.ThesizeofthegritchamberhasbeencalculatedspecificallyforTyson,Florida.

Figure07–AeratedGritChamber3.2.2 PrimaryClarifierTheprimaryclarifierwillremoveapproximately60%ofthesuspendedsolids,30%ofthebiochemicaloxygendemand(BOD),and20%ofphosphorous.Thewaterentersthisstageandwillspendacalculatedamountoftimeherespecifictothisfacility.(Forthisoranyothercalculation,seeAppendixB)Theprimaryclarifier,alsocalledaprimarysettlingtank,willalsocollectsolidwastefromthebottomofthetankaswellasthetopofthewater.Aslowmovingarmrotatesaroundthetopofthetank.


Figure08–PrimaryClarifierwithvisibleweirs3.2.3 AerationBasinThenextprocessinvolvesremovingnitrogen,phosphorousandremainingBOD.InfluententersananoxicstagethentoanoxidationstagetoremovenitrogenusingthemodifiedLudzak-Ettinger(MLE)process.Alumisalsoaddedtoremovethephosphorousintheinfluent.Themainfocusofthisprocess,though,istoremovetheremainingBODbyaddingreturnedactivatedsludge(RAS),whichcontainsmicroorganismsthatconsumetheBOD.Airispumpedintothesystemtoensurethesludgeremainssuspended.

Figure09–AerationBasin


3.2.4 SecondaryClarifierAftertheinfluentleavestheaerationbasin,itflowstothesecondaryclarifier(Figure10)whichissimilartotheprimaryclarifierbutproducesmuchmoresolidwastefromphosphorousandBOD.ThesolidswillcollectonthebottomandthemicroorganismswillbecomestarvedastheBODislowered.This“activated”sludgeisthenseparatedintoreturnedactivatedsludge(RAS)thatwillbepipedbacktotheaerationbasin,orwastedactivatedsludge(WAS)thatwillbesentwithotherwastesolidstoanareafordewatering.

Figure10–AnatomyofClarifierSystem3.2.5 DisinfectionThewaterisnowrunthroughpipeswithUVlight(Figure11)thatmutatesbacteriatothepointthattheyarenotabletoreproduce.Ifthebacteriacannotreproduce,theyareessentiallyharmlessastheirabilitytocauseillnessliesintheirabilitytoreproducetosignificantpopulations.TheUVlightscanposeadangertoemployeesworkingonthatpartoftheplant,butaresafeforanyoneinthearea.

Figure11–UVLightsinwater


3.2.6 AerationThedisinfectedwaterisdepletedinoxygenconcentrationandmustbere-oxygenatedbeforeitcanbedischarged,sothewatercascadesdownoverseveraldrops,or“mini-waterfalls”thatallowairtoentertheflow.Thismethodisverycostefficientasitdoesn’tinvolvepumpinginairtodiffusersbelowthewater,butitdoescauseanotherelevationdrop,sothisshouldbeconsideredwhendeterminingtheelevationoftheheadworks.

Figure12–CascadeAeration3.2.7 SolidsCollection/DewateringThesolidsthathavebeencollectedfromtheprimaryandsecondaryclarifiersarewetandneedtobestabilizedthroughadigestionprocessandthenplacedinacentrifuge(Figure13)fordewatering.Thisprocess“wringsout”thewaterfromthesolidwastethenthescrewconveyorpullsthesolidwasteoutoftheoppositesidewhereitcanbecollected.Thissolidwastecanbeusedtocovertrashinlandfills.Thisprocesscanbeodorintensiveandwouldbenefitfromagoodventilationsystem.


Figure13–DewateringCentrifuge4.0 SummaryThisistheproposedWaterReclamationPlantforTyson,Florida.WeatGreenSystemsEngineeringwouldliketohearfromyouatthepublicmeetingscheduledforMonday,November10,2014at1:25pm.WewouldlovetobuildthisnewfacilityforyoutocarryTysonintothefuturewithastate-of-the-artwaterreclamationfacility.Waterisourlifebloodofourcommunitiesandthisisabigstepintherecoveryprocessaftersuchahorribletragedy.Wewillputinawholenewplantatthesamelocationasbefore,withefficientpumpsandotherequipment.Wewillusescreens,andanaeratedgritchambertoremovelargerparticlesinthewater,andthroughtheuseofprimaryandsecondaryclarifiers,alongwiththeaerationbasin,wewillremoveallothersubstancesrequiredbycurrentregulationssothatthewaterwereturntotheenvironmentwon’tharmthatenvironment.TheuseofUVlightwillalsomakesurethatanyremainingbacteriaareharmless.


References

Mihelcic,JamesR.,andJulieBeth.Zimmerman.EnvironmentalEngineering:Fundamentals,Sustainability,Design.Hoboken,NJ:JohnWiley&Sons/Wiley,2010.Print.

"SecondaryTreatmentStandards."Home.N.p.,n.d.Web.06Nov.2014.<http://water.epa.gov/polwaste/npdes/Secondary-Treatment-Standards.cfm>.

"62-600:DOMESTICWASTEWATERFACILITIES-FloridaAdministrativeRules,Law,Code,Register-FAC,FAR,ERulemaking."62-600:DOMESTICWASTEWATERFACILITIES-FloridaAdministrativeRules,Law,Code,Register-FAC,FAR,ERulemaking.N.p.,n.d.Web.06Nov.2014.<https://www.flrules.org/gateway/ChapterHome.asp?Chapter=62-600>.


AppendixA:FigureReferencesFigure01:"FloridaSART:FloridaStateAgriculturalResponseTeam."FloridaStateAgriculturalResponseTeam(FloridaSART).N.p.,n.d.Web.06Nov.2014.Figure02:MadeusingGoogleEarthFigure03:MadeusingGoogleEarthFigure4:MadeonMicrosoftWord

Figure5:Mihelcic,JamesR.,andJulieBeth.Zimmerman.EnvironmentalEngineering:Fundamentals,Sustainability,Design.Hoboken,NJ:JohnWiley&Sons/Wiley,2010.Print.

Figure6:"RotaryBarScreen-TASETINC."EC21,GlobalB2BMarketplace.N.p.,n.d.Web.06Nov.2014.Figure7:"Projects."BogotáRiverEnvironmentalRestorationProject:Upgrade/ExpansionofSalitreWWTP.N.p.,n.d.Web.06Nov.2014.Figure8:"WastewaterTreatmentFacilities."InterLinc:.N.p.,n.d.Web.05Nov.2014.Figure9:"LiveEdit."WichitaFalls,TX.N.p.,n.d.Web.06Nov.2014.Figure10:"GC3TechnicalManual:Clarification."GC3TechnicalManual:Clarification.N.p.,n.d.Web.06Nov.2014.Figure11:"UVSuperstore,Inc.–UltravioletTechnologySpecialist–UltravioletPurificationEquipmentandParts."MunicipalUVWaterTreatmentSystems.N.p.,n.d.Web.06Nov.2014.Figure12:"JimmySmithWastewaterTreatmentPlant,UnitedStatesofAmerica."CascadeAeration;theTreatedEffluentIsDischargedintotheSouthForkofNewRiver.ThePlantUpgradeWasDrivenbyIncreasedEnvironmentalStandardsWhenThisWaterwayWasDesignatedanOutstandingResource.N.p.,n.d.Web.06Nov.2014.Figure13:"IndianStandardREQUIREMENTSFORSLUDGEDEWATERINGEQUIPMENTPART3CENTRIFUGALEQUIPMENT(SOLIDBOWLTYPE)."IndianStandard:REQUIREMENTSFORSLUDGEDEWATERINGEQUIPMENT,PART3CENTRIFUGALEQUIPMENT(SOLIDBOWLTYPE).N.p.,n.d.Web.06Nov.2014.


AppendixB:Calculations

1. PlantDesignVolume:

Tyson,FLPopulationYear Population2000 20,9042005 24,3802010 27,0312015 30,1802025 36,8652035 43,549

Volume=97gal/person/day

*Basedon2035populationprojection

𝑃𝑙𝑎𝑛𝑡 𝑉𝑜𝑙𝑢𝑚𝑒: !" !"##$%&!"#$%&∗!"#

×43,549 𝑝𝑒𝑜𝑝𝑙𝑒 = 4,224,000 !"##$%&!"#

2. GritChamberDesign

a. Volume(2Chambers)

PeakFlowDetentionTime:3min. PeakHourlyFlow:1.7!!

!

1.7!!

!×3 𝑚𝑖𝑛.× !" !

! !"#= 306 𝑚! ÷ 2 𝑐ℎ𝑎𝑚𝑏𝑒𝑟𝑠 = 153𝑚! 𝑝𝑒𝑟 𝑐ℎ𝑎𝑚𝑏𝑒𝑟

b. Dimensions

Depth=2.04m Ratio(W:D)=2.45:1

Width= 2.04𝑚×2.45 = 5.0𝑚Ratio(L:W)=3:1

Length= 5.0𝑚×3 = 15.0𝑚

y=668.42x+20154

0

10,000

20,000

30,000

40,000Population

Year

Tyson,FLPopulation

Population

Linear(Population)


LxWxD=15mx5mx2.04m

c. HydraulicRetentionTimeperChamber

𝐷𝑒𝑡𝑒𝑛𝑡𝑖𝑜𝑛 𝑇𝑖𝑚𝑒 = !"# !!∗!!.!!! × ! !"#

!" != !.!"!"#

! !"#$%= 2.125 𝑚𝑖𝑛

d. AirRequirements

2tanks15mlongeach

15𝑚× !.!" !!

!"#∗!= 5.25 !!

!"#×2 𝑡𝑎𝑛𝑘𝑠 = 10.5 !!

!"#

e. AmountofGritRemoved

0.6!!

!𝑤𝑤× !.!"#!!!"#$

!"!!!× !",!"" !

!"#= 0.78 !!

!"#

3. SettlingTankDesign: 2circulartanks

Depth:3m Overflow:45 !!

!!∗!"#

AverageFlow:0.6!!

!× !",!"" !

! !"#= 51,800 !!

!"#

PeakHourly:1.7!!

!× !",!"" !

! !"#= 146,900 !!

!"#

𝐴 = !!"= !",!"" !!/!"#

!" !!

!!∗!"#

= 1150 𝑚! ÷ 2 𝑡𝑎𝑛𝑘𝑠 = 575 𝑚! 𝑝𝑒𝑟 𝑡𝑎𝑛𝑘

Diameter: !"!!!

!/!= 27.06𝑚 ~ 27.5𝑚

ActualArea:!!×(27.5𝑚)! = 594 𝑚!

VolumeofeachTank:594 𝑚!× 3𝑚 = 1782𝑚!

𝐷𝑒𝑡𝑒𝑛𝑡𝑖𝑜𝑛 𝑡𝑖𝑚𝑒 = !"#$%&!

= !"#$ !!× !" !!/!"#!",!""!!/!"#

= 1.65 ℎ𝑟

𝑂𝑏𝑠𝑒𝑟𝑣𝑒𝑑 𝑜𝑣𝑒𝑟𝑓𝑙𝑜𝑤 𝑟𝑎𝑡𝑒 𝑂𝑅 = !!"#!

= !",!"" !!/!"#!"# !! = 43.6 !!

!!∙!"#

4. Aeration

a. TheBODincomingis85%Municipal,15%Industrial

i. MunicipalBOD5=275mg/L

ii. IndustrialBOD5=0.75(COD)=0.75(707mg/L)=530mg/L

iii. TotalBOD5Incoming= 275(0.85) + 530(0.15) = 313 mg/L


b. !!"#

= !!!!"

𝑆! − 𝑆 − 𝑘!

𝑄! = 4,224,000 !"#!"#

× !.!"# !!"#

= 16,000,000 !!"#

!! !"#$

=(!"×!"! !

!"#)×(!.!" !" !!!" !"#!

)

!×(!"##!" !!! )

× 313!"!− 30!"

!− !.!"

!"#

𝐴𝑒𝑟𝑎𝑡𝑖𝑜𝑛 𝑉𝑜𝑙𝑢𝑚𝑒 = 2.66×10!𝐿𝐴𝑒𝑟𝑎𝑡𝑖𝑜𝑛 𝑃𝑒𝑟𝑖𝑜𝑑 𝜃 = !

!

𝜃 = !.!!×!"!!

!"×!"! !!"#

= 0.166 𝑑𝑎𝑦 = 3.98 ℎ𝑟 ~ 4 ℎ𝑟

c. DrySolidProduction16×10! !

!"#× 250!"

!− 120!"

!× !"

!,!!!,!!!!"= 2,080 !"

!"#𝑝𝑟𝑖𝑚𝑎𝑟𝑦 𝑠𝑜𝑙𝑖𝑑𝑠

5 𝑑𝑎𝑦𝑠 = !"!!!!

=!.!!×!"!!×!"##!"

!!!×!!

× !"!,!!!,!!!!"

𝑄!𝑋! = 1809 !"!"#

𝑠𝑒𝑐𝑜𝑛𝑑𝑎𝑟𝑦 𝑠𝑜𝑙𝑖𝑑𝑠

d. F/MRatio:!!= !×!!

!×∀=

!"×!"! !!"#×!"!

!"!

!"##!"! ×!.!!×!"!!

= 0.554 !"#$%!" !"##∗!"#

5. TheSolidsRetentionTime(SRT)islow(5days),thismeansthattheF/MRatiois

high.Thepowerrequirementsforaerationwillbeless.Themicroorganismswill

besaturatedwithfood.Themeancellretentiontimeislow.Thesludgeageis

low.Thesludgewastageratemayhaverecentlyincreased.TheMLSSmayhave

beenincreased.

6. HydraulicProfile:Basedonthisplantwewillhaveastepdownbetweeneach

stageof1.5feet.Thetotalelevationchangefromheadworkstothedischarge

pointwouldbeabout10.5feet.Thesurplussreclaimedwaterthatisnot

distributedtogolfcourses,etc.willbedischargedtothenearbySt.John’sRiver

astheoldsystemhad.TheSt.John’sRiverisaoutsideoftown,whereourplant

isintownanditwilltakeabiggerelevationchangetogetthatdistance,however

theelevationofourplantisatapproximately13-15feetabovesealevelandthe

St.John’sRiversitsatsealevel,sothedeclineintheelevationofthelandwill

providefurtherflowassistanceofthedischargedwater.


7. FlowChartwithdescriptionsofprocesses:

FlowChartofthewatertreatment:

§ Waterentersthesiteundergroundinthepipesthathadfloweddownandaway

fromthecollectionsites.

§ Pumpsthenliftthewatertotherequiredheightattheheadworks.

§ Thewaterflowspassedbarscreensthatfilteroutlargeobjects.

o Theseobjectsaresenttothelandfill

§ Thewaterthenflowsthroughtheaeratedgritchamberwheresomeofthesmaller

solidswillsettleoutwhileairbubbleskeeporganicmaterialssuspendedduringthis

step

o Thisstepoftenincludesgreasesandfatsthathadenteredthesystem.

o Thesesolidswillalsobedisposedofatthelandfill.

§ Thewaterthenpassesthroughtheprimaryclarifierwheresomeofthesuspended

solids,BOD,andphosphorouswillsettleoutduetogravity.

o Theseclarifiershavearotatingarmthatwillalsostopfloatingsolidsthat

mayhavegottenthroughthescreenandgritchamber.

§ Thesewouldhavetoberemovedbyhand.

o Thesolidsatthebottomaresenttoanareaon-sitefordewatering

§ Thewaterenterstheaerationbasinandmixeswiththereturnactivatedsludge

(RAS)andairthatispumpedin.

o TheBODisremovedbythemicroorganismsinthereturnactivatedsludge

(RAS).

o ThemodifiedLudzak-Ettinger(MLE)processremovesthenitrogeninthe

waterhere.

§ Thisinvolvesananoxicstagepriortotheoxidationstage.

CollectionofIngluentfromCommunity

PumpsLiftWatertoHeadworks

BarScreens GritChamber

PrimaryClarigier

AerationBasin

SecondaryClarigier Disinfection

Distributionofreclaimed

waterDischargeto

river


§ Thisnitrifyinganddenitrifyingprocessiscosteffectivecomparedto

othermethods.

o Alumisalsoaddedtoprecipitateoutthephosphorousintheinfluent.

§ Theinfluentwillthenenterthesecondaryclarifierwheremoresludgewillsettle

out.

o Thesludgebecomesactivatedasitrunsoutoffood.Someofthisactivated

sludgeisreturnedtothebeginningoftheaerationbasin(RAS).

o Therestoftheactivatedsludgeiswaste(WAS),andissenttobedewatered.

§ Disinfectionisoneofthefinalstages;UVlightsareusedtodisableanyremaining

bacteriafromreproducingastheinfluentpassesbythem.

§ Distributionofthereclaimedwaterhastobedonewithcertainguidelinesinplace.

o Thiswatercanbeusedtowaterlawns,golfcoursesandflowers.

o Itisnotsafetodrinknorshouldbeusedtowaterediblefoodsunlessitis

drippeddirectlytorootsystems.

o Itisnottobeusedintoiletseither.

§ TheeffluentthatisnotreusedisdischargedtotheSt.JohnsRiver.

o Thelevelsatwhichthingsaredischargedwillbesafefortheriver.


FlowChartforSolidRemoval:

§ Dewateringprocessofsolids:

o Afterthesolidsarestabilized,thesolidsareputinasolidbowlthatisspunat

highspeeds,knownasacentrifuge.

§ Thisallowswatertodrainoutwhileascrewconveyorremovesthe

remainingsolids.

o Alongtheprocess,pipesaremountedaboveexposedwastetohelppullair

awayfromthefacilitytohelpcontroltheodor.

§ Thisairisthenrunthroughanactivatedcarbonfiltersystem.

§ Thesolidwastecanthenbereusedatthelocallandfilltoputdownontopoflayers

oftrash.

SolidWastetoLandgill

SolidsfromBarScreens

SolidsfromGritChamber

SolidWastetoDewatering

SolidsFromGritChamber

SludgefromPrimaryClarigier

WasteActivatedSludge(WAS)fromSecondaryClarigier

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