obg presents: alphabet soup: mbbr ain'texactly enr or ifas!€¦ · trickling filters...
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OBGPRESENTS:
AlphabetSoup:MBBRAin't ExactlyENRorIFAS!LessonsAlongtheWaytoOptimizationTri-AssociationConference2017 8/30/17 2:30PM-3:00PMBillMeinert&NedTalbot,OBG
ProjectOverview
Overview
MMoving
BBed
BBiofilm
RReactor
FixedBiofilm/IR/TN(&someTP)Removal FixedBiofilm+SS/IR+RAS/TN+EBio-P
IIntegrated
FFixed-Film
AActivated
SSludge
Protectedbiomassonplasticmediaexpandscapacityandeffluentquality
Nutrients,peakflows,coldtemps
3
MBBRforMartinsburg
Benefits Obstacles
4
MBBRPiloting
PilotedSeptember2011– March2012
WarmandCold,DryandWet,IRAdjustments
AirdistributionandDOcontrol(+/-),Noclarification
Initial– Nitrification,startup,warm&cold(vs.Tower)
5
Comparison– DN,TowerEffluentDO&temp,Carbon
Pre- &Post-AnoxicMBBRSizing
BOD-limitedNutrientRemoval(addCarbon)
WRRFProject:MARTINSBURG,WV
3MGD(12MGDinfluent,10MGDpeaktobio)
5mg/LTNeffluentlimit
0.5mg/LTPeffluentlimit
ProjectSummary
Demo:
Tricklingfilters
Nitrificationtower
Modifications:
NewHeadworks,Biological,BallastedPolishing
ImproveClarification,Disinfection,AnaerobicDigestion
NewSolidsHandling,OperationsBuilding
Tankconfiguration
Minimizeapproachvelocity(~30-35m/hr max)
Failsafestocontainmedia
Physicalandoperational
ImportantDesignDetails
Variationbetweenvendors
Pre-purchase/selection
7
Pre-PurchaseSelection
Suez(IDI) Kruger Biowater Technology Headworks
Operationaldeadline– June2016
Pre-purchasedMBBR
Lowestlife-cycle,capitalcosts
PotentialchangetoIFASinfuture
8
MartinsburgWWTPUpgrade
SimplifiedProcessFlowDiagram
9
1.Headworks
2.MBBR
4.Co-Mag
3.Disinfection
5.SolidsHandling
6.O&M,Lab
10
New5mmscreensandgritPHASE1(INTERIM)HeadworksTrickingFilterNit.TowerTank2
Pre-Anoxic
EffluentChannel
Swing
InternalRecycle
Re-Aeration
Nitrification
Post-Anoxic
Tank 1
IR
Tank 2
INTERIMWASTEWATERTREATMENT
Keep1tricklingfilteronline
Site/sizerestrictions
BuildMBBRin2stages
CanalsobypassTank1
Maintenance
Or,ifmediablockage
11
NEWTANKS
Allowedfor“ideal”reactors
SquareZones
3-4ft freeboard
Overflowsbetweenreactors
12
MartinsburgWWTPUpgrade
InterimWastewaterTreatment
13
Changefrom8hrto24hrcompositeSampling
8-hrovernightcomposite
24-hrovernightComposite
(a30%jump)
Headworks
Status:Constructed,Optimized
PHASE2(FINAL)HeadworksTank1+2
SolidsHandlingOperations
15
ConstructionStaging,Startup,Optimization(LessonsLearned)
MBBREquipmentPre-PurchaseChallenges
TimingofEquipmentDelivery
StorageDuringPhasing
VendorControlsEngineerTurnover
LackofVendorStartupSupport
ContractCoordination
Phase1StartupJune2015
InitialStartup
• PESplitbetweenTFandMBBR• AllflowtoNitrificationTower• CoagulanttoPC– removeBOD
After2weeksofoperation
• AllPEtoMBBR• Toweroffline• CoagulantContinued
MinimumflowrequiredforfilterarmsSlowbiologicalgrowthonmediaConstruction6monthsbehind
LESSONSFROMCONSTRUCTION
IRzoneflapgates
Highmixingvelocity
MinimizeDOentrainment,MediabackintoIRzone
Flatscreenaddition
Still- mixingisgood!
Keepsmediafromblocking
Squaretanks,airscourfacilitateroll
Warrantylengths
Tank2endnearperformancetest
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Phase2StartupMarch2016
VariableMBBRInfluentLoading
ConstructionImpacts- AnaerobicConditionsinPrimaryClarifiers
ConstructionSequencing,DiurnalVariations- HighAmmoniainDewateringFiltrate
Interim,PartialProcessPerformance
Limiteddatatodrivedecisions
SCADATrendingnotonline
NutrientProbesnotinstalled
Onlygrabandcompositesamples
Toomuchconstructionworkwaspushedtotheend!
LESSONSFROMCONSTRUCTION
AerationSystemSafetyFactorisKey
Adequateblowerpressure/tempcapacity
AutoDOcontrolofeachzoneaddspressuretosystem
Monitortemp/pressurealarmsseparatelyfortroubleshooting
ManualBlowerControlistricky
CheckDOatseveraltimesduringtheday
Underaerationduringdayworsethanoveraerationatnight
MotorizedValveSetupCritical
Integratewithprocesscontrolperformancetesting
NitrificationProcessPerformance8/2016-8/2017
Nitrificationestablished,ButLostdueextendedaerationsystemissues Nitrificationre-established,
UsingSwingZone,CorrectingMBBRbiofilmmigration
Nitrifier &Denitrifier PopulationsandSwingbySeason
Pre-Ax Nit-1 Nit-2 Post-AxSwing
DenitrificationProcessPerformance8/2016-8/2017
NitrificationestablishedinPhase1,DenitrificationinPhase2
Denitrificationestablished,butnotoptimizeduntilSCADA,Auto,andCarbonfeedandAerationSystemfixed
CoagulantfeedandCoMag ballastedflocusedtopolisheffluentTSSandTP.
Conclusions&PlanGoingForward(Post-Construction)
ProcessDifferencesReinforcedduringConstruction&Operation
SuspendedGrowthProcess• Biologycanmovethroughoutprocesstrain• 2mg/LorlessDOinliquidphaseforaerobicprocesses• Suspendedbiologyactsasabuffer• DOcarryovercontrolledbytaperedaerationtomatchload
FixedFilmProcess• Biologyfixedinzones.Adjustmentstaketime.• 3-4mg/LDOliquidphasetodriveoxygenintofilm• QuickerDOchanges.DOcontrolmorechallenging.• HigherpotentialforDOcarryovertopost-anoxic.Additionalcarbonneededfordenitrification.
…anddifferentmixing(RAS,IR)andsludgewastingabilities.
Optimization&PathForward
AutoDOandcarboncontrolrequiredforoptimization.
Blowersbeingmodifiedtoprovidebetterpressure/temperaturecapability
Swingzoneuseandnumberoftrainsrequiredinwintertobeoptimizedduringnextcouplemonths.Transitiontostartearly.
Solidsrecycleswillbeanalyzedtodeterminewaystospreadoutammoniaload– Equalization?
OBG|THERE’SAWAY
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