Co-DigesCon with · Cheri Cousens, GLSD Richard Weare, GLSD Benjamin Mosher, CDM Smith ... • Alternave Energy Credits • Renewable Energy Credits • Avoided Cost

NEWEA–2018AnnualConference&Exhibit

January22,2018

TheNextStepTowardsNetZeroOperaConattheGreaterLawrenceSanitaryDistrict

CheriCousens,GLSDRichardWeare,GLSDBenjaminMosher,CDMSmithMichaelWalsh,CDMSmith

Co-DigesConwithFoodWasteOrganics


TheNextStepTowardsNetZeroOperaConatGLSD

§  Background§  ProjectDrivers§  TheProject§  ConstrucCon&Pilot

ProgramStatus§  ProjectedBenefits

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GLSDBACKGROUND

§  EstablishedbyMassachuseWsLegislaConin1968

§  OperaConalSinceApril1977§  GovernedbyaBoardofCommissioners§  SecondlargestWWTPinMassachuseWs

(52mgdaverage/135mgdpeakdesign)§  Interceptors

§  9Miles§  24”through108”

§  RiversidePumpStaCon§  2-800HPpumps§  2-1,250HPpumps

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TheGreaterLawrenceSanitaryDistrict(GLSD)

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Salem

Andover

NorthAndover

NH

MA

RegionalWWTF

Methuen Lawrence

Merrimack

River

Dracut


EvoluConofBiosolidsManagementatGLSD

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Vacuum Filter

Dewatering

Multiple- Hearth

Incineration

Waste Activated Sludge

Primary Sludge

Waste Activated and Primary Sludges

Belt Filter Press

Dewatering Cake to Off-Site Disposal (1/3 Total)

Liquid to Off-Site Disposal (2/3 Total)

Original Solids Train (1977 to 1989)

Modified Solids Train (1989 to 2002)

Ash to Landfill

Gravity Thickening

Gravity Thickening

DAF Thickening

Anaerobic Digestion

Thermal Drying

Waste Activated Sludge

Primary Sludge

Current Solids Train (2002 to 2016)

Beneficial Reuse

Gravity Thickening

Gravity Belt Thickening

Centrifuge Dewatering


MassachuseWsOrganicWasteDisposalBan

§  EffecCveOctober1,2014–Producersof>1tonoffoodwasteperweekbannedfromlandfillsorincinerators

§  Impactshotels,restaurants,universiCes,hospitals,supermarkets,foodprocessorsandwholesalers

§  MassDEPesCmates350,000tonsoforganicwastewillbedivertedfromlandfillsyearly

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LimitedNewEnglandDigesConFaciliCes

§  AcceptableoutletsincludedigesConfaciliCes

§  GLSDisoneofonlysixinMassachuseWs

§  SecondlargestdigesConfacilityinMassachuseWs

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R.I.19(1)

MASS.118(6)


Co-DigesCon

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Wastewater Sludge

Organic

Waste

Glass Plastic

Cardboard

Sidestream

Anaerobic Digestion

Power

Effluent

Heat

Biogas Treatment

and Use

Biogas

Class A Biosolids

Biosolids Processing

Wastewater Treatment

Pre-Processing


ImpactofCo-DigesCononBiogasProducCon

BiosolidsSourceSeparatedOrganic(SSO)FoodWaste

FeedStock(Gal/Day) 10,000 10,000

Solids(%) 5 13

VolaCleSolids(%) 75 85

VolaCleSolidsConverted(%) 55 82

BiogasYield(CubicFeet/lb) 15 13.5

BiogasVolume(CubicFeet/day) 26,000 102,000

EnergyProduced(MMBTU/day) 14 56

PotenOalElectricalProducOon(kWH/yr) 600,000 2,300,000


TheEconomicsofCo-DigesCon

Credits•  Revenue•  TippingFees•  AlternaCveEnergyCredits•  RenewableEnergyCredits

•  AvoidedCost•  PurchaseofUClityElectricity•  FutureIncreasesinEnergyCosts

•  GrantsandIncenCves• MassDEP• MassCleanEnergyCenter• MassDepartmentofEnergyResources•  NaConalGrid(ElectricSupplier)

Costs•  Capital•  SSOReceivingFaciliCes•  ExpansionofExisCngDigesConSystem•  BiogasTreatment•  CombinedHeat&Power(CHP)FaciliCes•  CHPEmissionsControl

•  OperaConsandMaintenance•  IncreasedDewatering/DryingCosts•  CHPMaintenance•  BiogasMediaReplacement


HistoricalBiogasData(Analysisof2013–2016)

Oxygen:02 1.2%Nitrogen:N2 3.8%

Methane:CH4 60%CarbonDioxide:CO2 35%HydrogenSulfide:H2S 73ppmv

w/FerricChlorideBTU/CF 605

Sp.Gravity 0.9Siloxanes 1110ppbv


ExisOngBiogasTreatmentandUses

Treatment:MoistureRemoval–DripTraps GLSDBiogasGlycolBoiler


GLSDCo-DigesConFeasibilityStudy(June2013)

§  Couldprocess~28,000gpdofSSOmaterialinexisCngdigesConsystem

§  Couldprocessupto92,000gpdofSSOmaterialwithaddiConof4thdigester

§  Canmeetupto40%oftheCommonwealth’sgoalforSSOdiversion

§  EconomicsarehighlydependentonvolumeofSSOmaterialreceived&energycredits

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TheProject

NEWEA–2018AnnualConference&Exhibit15

GLSDOrganicstoEnergyProjectComponents


FoodWasteOrganicstoEBS®anEngineeredBioslurry

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CORe®SSOReceiptHopper&Bioseparator EBS®Product

EBS®Mixing&StorageTank


OrganicWasteReceivingandConveyance

TruckOffloadStaCons

ReceivingTanks

PumpedMix

System

SSOTransferPumps


AnaerobicDigesterNo.4

§  1.4-MGvolume§  Draptubemixers§  Steelgas-holdingcover§  SpaceavailablewithinexisCng

DigesterBuildingforDigesterNo.4heaCngandpumpingequipment

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BiogasConveyanceandTreatment

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Fixedmedia(ironsponge)forhydrogensulfidetreatment

Carbonmediaforsiloxanetreatment

Expandedgasconveyancecapacity

Newflareforincreasedcapacity




CombinedHeat&Power(CHP)Engines

§  TworeciprocaCngCHPgenerators§  Totalcapacityof3.2MW§  Spaceforfuturethirdengine§  Powerfedtositeelectricalsystem

andnetmeteredtotheuClitygrid§  Projectedavgpowerdemands:

§  Plant:1,700kW(onsite)§  RSPS:700kW(vianetmetering)

§  Heatcapturedtosupplydigestersandotheron-siteheaCngdemands

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CHPEngineEmissionsControl

§  OxidaConCatalyst(OC)technologytoremovevolaCleorganicscarbonsandcarbonmonoxide

§  SelecCveCatalyCcReducCon(SCR)technologytoremovenitrogenoxides

§  BestAvailableControlTechnology(BACT)asdeterminedbyMassDEP

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CurrentProjectStatus

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ProjectConstrucConCosts

§  ConstrucConBidCost: $25,713,966§  GrantsandIncenCves

§  MassachuseWsCleanEnergyCenter $400,000§  MassachuseWsDepartmentofEnvironmentalProtecCon $500,000§  MassachuseWsDepartmentofEnergyResources $5,000,000§  NaConalGrid $2,340,000§  MassDEPPrincipalForgiveness $1,597,994

TotalGrantsandIncenCves $9,837,994

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PilotProgramObjecCves&IniCalFindings

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•  AssesslogisCcalissuesassociatedwithreceivingandprocessingtheSSOmaterial

•  DeterminetheincreaseingasproducCon•  EvaluateADoperaCngparameters•  Determineimpactsoncentrifuge

performance,polymerusageandcentratecharacterisCcs

•  Determineimpactofcentrateonsecondarywastewatertreatment

•  DetermineimpactofSSOmaterialondewateringandthermaldryingoperaCons

•  DetermineimpactsonferClizerpelletproducConquality.

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ObjecOves IniOalFindings

•  PumpingisuniqueforSSO•  Meteringshouldbewithfoodgradedevices•  NoadverseimpactstoADoperaCons•  CentrifugePerformance

–  Torquehasincreased–  Lesspolymerusage–  NochangeincentratecharacterisCcs

•  Noincreaseindigestersludgevolumestothermaldryingfacility

•  NoimpactonferClizerpelletproducConorquality

NEWEA–2018AnnualConference&Exhibit27

PilotProgramBiogasProducCon


CurrentProjectStatus

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Challenges

§  FinancinganAtypicalWastewaterProject(costsvs.revenues)

§  NetMeteringCap§  CommunityAcceptance§  SecuringFeedstock§  Permivng(AirandNoisePolluCon

Control)§  EngineOperaConsand

Maintenance§  MarketAnalysis

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Successes

§  Improvedfacilityresiliencyandreliability§  Providesaneteconomicbenefittothe

DistrictanditsmembercommuniCes§  Upto$2.5Mannualpowersavings

§  18millionKWH/year

§  $9.8MinFinancialAssistance§  UpdatedHostCommunityAgreement§  ElectricalInterconnecConAgreement§  ProcurementofOrganicMaterial§  FurthersGLSD’sTradiConofInnovaCon

andGoalofNetZeroOperaCon

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ProjectPartners

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Contactus!

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RichardWeare(978)[email protected]

MichaelJ.Walsh,P.E.(617)[email protected]

Co-DigesCon with · Cheri Cousens, GLSD Richard Weare, GLSD Benjamin Mosher, CDM Smith ... • Alternave Energy Credits • Renewable Energy Credits • Avoided Cost

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