biosolids stabiliza-on in concord, new hampshire – so ...biosolids stabiliza-on in concord, new...
TRANSCRIPT
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BiosolidsStabiliza-oninConcord,NewHampshire–Sowheredowe
gofromhere?
Presentedby:ChrisDwinal,PE
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• HistoryofbiosolidsinConcord
• CurrentRDPlimestabiliza-onsystem
• 2015BiosolidsStabiliza-onEvalua-on
• Short-termplan
• Long-termrecommenda-ons
• Keyfactorsinul-matepathforward
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1999 2002
2005 2010 2014 2015 Pre-1999
- Plate and frame press - Class B lime stabilization - Land spreading through RMI
First Biosolids Study recommends belt filter presses
and RDP Class A lime stabilization
Dewatering and RDP Upgrade Complete
Biosolids Stabilization
study recommends RDP
short term, ATAD/TPAD long
term
Comprehensive WWTF Evaluation
recommends THAD and RDP
evaluation
2003 2016
Multiple studies/upgrades to address process issues and fugitive odors and lime dust
RDP Upgrade Underway
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• Difficultymee-ngClassAwithvaryingsludge
• Ineffec-vemixingoflimeandbiosolids
• Fugi-vedust/odoremissions
• Ledtoven-la-on,odorcontrol,andconveyor/mixingupgrades2008-2010
• Systemfinallyrunningwellforpast5years,buts-llnotideal…
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• ClassAandBlimestabiliza-on
• Compos-ng
• Thermaldrying
• ATAD
• Incinera-on
• Landfill
• Anaerobicdiges-on–mesophilic,thermophilic,thermalhydrolysis
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• Oneofseveralcompletedsince1999• Goals
§ Conductcomprehensiveevalua-onofcondi-onandlifeexpectancyofRDPsystem◗ Recommendedin2014ComprehensiveEvalua-on◗ CityhascontractwithRMIthrough2021fortruckingandreuseofClassAlimestabilizedsolids($29.10/wetton)
§ Conductacomprehensivereviewofallbiosolidsprocessingandreuseop-onsavailabletoConcord◗ NHDESrecommenda-on
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• Greatshapefor12yrs.ofservice
• Allequipments-llfunc-oning
• Augerheatersareweakpoint
• SomedamagetoThermoblender
• Limedust/ammoniaemissionsinprocessingroomandgaragenotacceptabletoCitymovingforward
• Severalupgradeop-onsconsidered
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Compos-ng
ClassAlimestabiliza-on
Anaerobicandaerobicdiges-on
Drying–mechanicalandsolargreenhouse
Incinera-on
Gasifica-on
Carboniza-on
DewateredBiosolidstooff-siteprocessing
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DemonstratedTechnology
ScalabletoConcord’sneeds
Poten-alforoff-siteodors
Endmarketforprocessedbiosolids
Possibilityofpublic-privatepartnership
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• Notdemonstrated
§ Carboniza-on,gasifica-onandthermalhydrolysis
• Notscalable
§ Incinera-on
• Odorpoten-altoohigh
§ Compos-ngandsolargreenhousedrying
• Landfilling
• Public-privatepartnership
§ S-gmaofbeingdumpinggroundfortheregion
§ Concernswithodors–historicalissuesinConcord
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• 3ClassALimeStabiliza-on§ RetainRDPlong-term§ SchwingBioset§ FKCscrewpress
• 3Diges-on§ TemperatureorTwoPhaseAnaerobicDiges-on§ MesophilicAnaerobicDiges-onwithDrying§ AutothermalThermophilicAerobicDiges-on
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GoodIndoorAirQuality
ProcessStabilityand
Control
Simpleandoperateandmaintainin8-hourshie
MinimalrecycleloadstoWWTF
Poten-alforenergyrecovery
Endproductquan-tyand
quality
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• RDP• SchwingBioset• FKCScrewPress
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PROS CONS
Noenergyrecovery
Full--mestaffingrequired
Poorprocesscontrol/stability
Poorairquality
Limitedrecycleloadsimpact
Nopostprocessingrequired
Stackable,dryendproduct
Simpletooperate
OdorswhenspreadingVerycosteffec-ve-exis-ng
50U.S.installa-onsCalciumsatura-onissues
Highestbiosolidsquan-ty
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PROS CONS
Calciumsatura-onissues
Requirespostprocessing
Poorendproductquality
Noenergyrecovery
Simpletooperate
Limitedstaffingrequired
Goodprocesscontrol/stability
Fullyenclosedgoodairquality
Highbiosolidsquan-ty
30U.S.installa-ons
Limitedrecycleloads
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PROS CONS
24/7opera-on
Highbiosolidsquan-ty
Calciumsatura-onissues
Noenergyrecovery
Limitedrecycleloads
Simpletooperate
Goodprocesscontrol/stability
Goodairquality
3U.S.installa-ons
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CONS
Highrecycleloads
Complexprocessx2
24/7opera-on
PROS
Excellentbiosolidsquality
Goodenergyrecovery
Goodprocesscontrol/stability
Fullyenclosedgoodqualityair
30U.S.installa-ons
Lowestbiosolidsquan-ty
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CONS
HighestrecycleloadstoWWTF
Complexprocess
Numerousinterna-onalinstalla-ons,butonly4U.S.
PROS
Highestenergyrecovery
8-hourstaffingduetoautoma-on
Goodprocesscontrol/stability
Fullyenclosed,goodairquality
Excellentbiosolidsquality
Lowestbiosolidsquan-ty
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CONS
Noenergyrecovery
Moderatelycomplexprocess
PROS
Excellentbiosolidsquality
8-hourstaffingduetoautoma-on
Goodprocesscontrol/stability
Fullyenclosed,goodairquality
Lowbiosolidsquan-ty
LowrecycleloadstoWWTF
40U.S.installa-ons
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• MADdroppedduetocomplexityand24/7
• TPAD/2PADandATADcarriedforth
• Both~$20millioncapitalcost• TPADlowerlife-cyclecostduetolowerenergyrequirements
• Splitdecision§ StaffmorecomfortablewithATADandmoreinstalls§ TPAD/2PADlowerlifecyclecost(electric)butfarlessinstalls
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• Verycosteffec-ve,25%thecostofdiges-on• But,notdesirablelongterm
§ Highestbiosolidsquan-ty,lowestbiosolidsquality§ Nopoten-alforenergyrecovery§ Higheroperatoralen-onrequired§ Concernswithairquality
• However,goodshorttermop-on§ UpgradeRDPandven-la-on-~$2million§ Lowcost-ppingfeeinplacethrough2021
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• Someformofdiges-on–consistentwith2006and2014studies
• TPAD/2PADlowestlifecyclecosts,but• CitystaffpreferATAD
§ Familiaritywithequipment§ ManymoreU.S.installs§ ConcordWWTFtypicalsizeofATADinstalls
• So,what’snext?
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• TPAD/2PADlife-cyclecosts-llcheaperwithlowerelectricitycost§ capitalcostofTPAD/2PADlowerthanATAD
• UpgradingRDPallows-mefor…§ furtheradvancementofTPAD/2PADtechnology§ AllowformoreU.S.installs§ preliminarydesignstonailcosts§ Possibledevelopmentofalterna-vepowersourcestostabilizeelectricityrates?
§ Possiblemerchantfacilityforoffsiteprocessing?
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• Overpasttwoyears§ Highof$0.147/kWh§ Lowof$0.112/kWh§ Averageof$0.132/kWh
• NewsolarPVincornfieldnexttoWWTF§ 20yearfixedpriceof$0.086/kWhjustforsupply§ Essen-allyequaltocurrentsupplypriceforWWTF§ WilloffsetotherhigherpriceelectricityusersinConcord
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Ques-ons?