NEWEA/NYWEAJointSpringMee3ngGroton,Connec3cut

June7,2016

TheCityofGroton,CT’sPublicAwarenessCampaignSuppor3ngWWTFImprovements

andTheMashantucketPequotTribalNa3on’s

WWTFWaterReuseSuccessStory

PresentersStephenSeigalP.E.,BCEE,Tighe&Bond

DavidDrobiak,MashantucketPequotTribalNa3on

CityofGrotonWWTFUpgradeProjectBackground

Sludge Holding Tanks

Grit /Screenings Room

Covered Primary Clarifiers

Chlorine Contact Tank

Blower Building

Aeration Tanks

Secondary Clarifiers

Digesters

CityofGrotonWWTFUpgradeProjectGoals

■  Reduce unexpected repairs and operating budget impacts

■  Identify equipment and structures in need of rehab or replacement

■  Develop a phased capital improvement plan

CIPNeeds–Immediate/ShortTerm

Es$matedCost

$770,000

IssueRepairprimaryclarifiertanksandhatches

CIPNeeds–Immediate/ShortTerm

Es$matedCost

$1,400,000

IssueReplaceprimaryclarifierequipment

CIPNeeds–Immediate/ShortTerm

Es$matedCost

$408,000

IssueRepairconcreteatprimarypumpwetwellandflowdistribu3onstructures

CIPNeeds–Immediate/ShortTerm

Es$matedCost

$497,000

IssueReplacefinalclarifierequipment

CIPNeeds–Immediate/ShortTerm

Es$matedCost

$560,000

IssueReplaceboilerandheatexchanger

CIPNeeds–Immediate/ShortTerm

Es$matedCost$1,102,000

IssueReplaceelectricalservice/transformers,motorcontrolcenters,feeders,andligh3ng

CIPNeeds–Immediate/ShortTerm

IssueRenovateBlowerBuildingandRelocateLaboratory

Es$matedCost

$380,000

BlowerBuilding

ProjectCostSummary

Work performed by General Contractor $ 4.5 Million

Work performed by City, Engineering, $1.6 Million and Contingency TOTAL ESTIMATED PROJECT COST $6.1 Million

Groton’sPublicEduca3onCampaign

■ Mul3pleStepProgram

–  EducateCityLeadersaboutNeedforProject

tpo TREATMENT PLANT OPERATOR

EducateCityLeadersabouttheProject

Groton’sPublicEduca3onCampaign

■ Mul3pleStepProgram

–  EducateCityLeadersaboutNeedforProject

–  EducatethePublic

EducatethePublic

■  City’sWebsite

■  Facebook

EducatethePublic

■  City’sWebsite

■  Facebook

■  Newspapers

EducatethePublic

EducatethePublic

■  City’sWebsite

■  Facebook

■  Newspapers

■  FacilityTours

EducatethePublic

■  City’sWebsite

■  Facebook

EducatethePublic

■  City’sWebsite

■  Facebook

■  Newspapers

■  FacilityTours

■  Video

TheMashantucketPequotReclaimedWaterProcess;

ThePro&Cons

DavidDrobiak,Superintendent,MPTNWWTP102TrolleyLineBoulevardMashantucket,CT06338

*  1993-MashantucketPequotTribalNation(MPTN)buysLakeofIsles(LOI)property

*  1998-MajorexpansionatWastewaterTreatmentPlant

*  2000-MPTNbuildstwo18holechampionshipgolfcoursesusingreclaimedwaterirrigation

ReclaimedWaterHistory

*  ModificationstotheexistingWWTFincluded:

* addSBRtank(SBR4)*  retractablediffuserstoSBR3&4* UVdisinfectionsystemupgrade

*  centrifugeforsolidshandling

ReclaimedWaterHistory2003SystemUpgrade

*  TheLOIGolfCourseusesan800,000gallonreclaimedwaterstoragetank

*  Wateringoccursbetweenthehoursof9PM-3AM

*  Variablespeedpumpsfillthestoragetankonacontinuousbasis

SystemOperation

MPTNWWTPProcess

*  TheMPTNWWTPProcessincludes:

*  InfluentScreening

*  SequencingBatchReactors

*  PostEqualizationTanks

MPTNWWTPProcess

*  PostEffluentFiltration

*  Eachfilterhasanaveragecapacityof1.5mgd

*  Mediaisa10micronnylonpilecloth

MPTNWWTPProcess

*  UVDisinfection

*  TrojanUV3000Pluswith3banksof80bulbseach

*  Provides≥100mw/cm2<70%transmittanceatapeakcapacityof5.7mgd

MPTNWWTPProcess

MPTNWWTPProcess

*  FinalEffluentStorageDisinfectedorDisposalto:

*  RapidInfiltrationBeds

*  ReclaimedWaterStorageTank

*  WasteActivatedSludgeHoldingTanks

*  SludgeHandlingFacility

*  UltimateDisposal-Incineration

*  ReuseispermittedfromApril1throughOctober30

*  NosprayapplicationofReclaimedwaterduringrainfall,afterleaffall,orexcessivewindyperiods

*  Syringingofgreenswithhandheldhosewhennooneotherthanmaintenancepersonnelarewithin50ft

DischargePermitHighlights

*  PermitLimits:*  BOD–10mg/l

*  TSS–5mg/l

*  TotalNitrogen–10mg/l

*  TotalPhosphorus–1mg/l

*  Turbidity–<2.0NTU

*  MaxDailyFlow–1,200,000gpd

*  ChlorineResidual–0.2–1.5mg/l

*  FecalColiforms–Nottoexceed2.2col/100mL

*  UVDosage–Needtomaintainatleast100mWsec/cm2

DischargePermitHighlights

5parametersthatrequireceasingreclaimedwater:

*  TheUVdoseisnotmet

*  Turbidityexceeds2NTU

*  Chlorineresiduallimitinnotmet

*  Fecalcoliformexceeds2.2col/100mL

*  Totalphosphorusexceeds1.0mg/l

DischargePermitHighlights

*  Pros—

*  It’sbenefitstotheenvironmentaresubstantial

*  Itextendsthelifeexpectancyoftherapidinfiltrationbeds

*  Thecostsavingsissubstantial.Potablewaterversusreclaimedwateris6timesthecost

ReclaimedWaterSystemPros&Cons

*  Cons–*  Thestringentdischargepermitnecessitates:

*  Constantmonitoring

*  Dailyadjustments

*  Repairs

*  ReplacementofEquipment

*  Maintenance

*  Troubleshooting

SystemPerformancePros&Cons

*  Forthepast6yearsthesystemhaslargelyoperatedasintended

*  Suppliedover160milliongallonsofreclaimedwatertoLakeofIsles,withover300milliongallonssince2006

Summary

Thankyouto:MichaelBoland–MPTN,Directorof

NaturalResourcesJenniferPorter–MPTN,Admin

AssistantIIforUtilities&Wastewater