nbc wastewater treatment plant updates...
TRANSCRIPT
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NBC Wastewater Treatment Plant Updates
Phil Albert, Chief Environmental EngineerTom Brueckner, Engineering Manager
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FIELDS’ POINT WWTFTreatment Upgrades for Kruger AnoxKaldnes
Integrated Fixed Film Activated Sludge (IFAS) System
Modify 10 Aeration Tanks to IFAS System
Install 9 Turbo Blowers to Increase Aeration Capacity
Increase Lift of 4 Screw Pumps
Add Carbon Feed (Methanol or Micro‐C Glycerin) for Second Anoxic Zone
Add Fine Screening to Protect AT Sieves and Add NaOH Feed to Adjust Alkalinity
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FIELDS’ POINT WWTFEXISTING COMPLETE MIX ACTIVATED SLUDGE
food (primary effluent) + bugs (RAS) = O2 (air from blowers) = BOD reduction
PE &RAS
PE &RAS
PE &RAS
PE &RAS
ATEFFL
ATEFFL
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RE‐AERATION
P
MM
MM
MM
MM
MM
PE &RAS
PE &RAS
PE &RAS
PE &RAS
ATEFFL
ATEFFL
FIELDS’ POINT WWTFFUTURE IFAS SYSTEM(Under Construction)
SODIUM HYDROXIDE(ALKALINITY/pH)
CARBON FEED(FOOD)
ANOXICIMLRIFAS ZONEANOXIC
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P
MM
MM
MM
MM
MM
PE &RAS
PE &RAS
PE &RAS
PE &RAS
IFAS (AS) ZONE Mixed Liquor and IFAS Media
Screens to keep media in IFAS zone but allow MLSS to next zone
NH3 + O2 + nitrosomonas/nitrobacterNO3
works best when alkalinity ~ 150 mg/l and pH ~ 6.8
ATEFFL
ATEFFL
SODIUM HYDROXIDE(ALKALINITY/pH)
CARBON FEED(FOOD)
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P
MM
MM
MM
MM
MM
PE &RAS
PE &RAS
PE &RAS
PE &RAS
ATEFFL
ATEFFL
IMLR (internal mixed liquor recycle)
ANOXIC(DO <.5 mg/l)
FIRST ANOXIC ZONEDO < .5 mg/l
NO3 + PE (food) + RAS (bugs) = N(gas) + BOD removal (Total Nitrogen to 8‐9 mg/l) Mixers but slow enough not to generate O2Internal recycle of NO3 enriched ML from IFAS zone
NO3
SODIUM HYDROXIDE(ALKALINITY/pH)
CARBON FEED(FOOD)
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P
CARBON FEED(FOOD)
SODIUM HYDROXIDE(ALKALINITY/pH)
MM
MM
MM
MM
MM
PE &RAS
PE &RAS
PE &RAS
PE &RAS
ATEFFL
ATEFFL
SECOND ANOXIC ZONEDO < .5 mg/l
In second anoxic zone there will still be some NO3 enriched MLSS but no food NO3 + food (carbon source) + bugs =N (gas) total nitrogen to 5 mg/l
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Costs for Nitrogen Removal at NBC WWTF’s
EffluentTN Reduction
Const. Cost
IncreasedO&M Cost
AnnualizedCapital
and O&M
NitrogenRemoval
Costmg/L lb/Year $ M $ M/YR $ M/YR $/lb N
Fields' Point WWTF 5 445,056 $31.0 $2.0 $4.19 $9.42
Bucklin Point WWTF (2006) 7.5 367,647 $8.3 $0.7 $1.29 $3.51
Bucklin Point WWTF (2011) 5 15,372 $13.0 $0.3 $1.22
Bucklin Point Overall 5 382,000 $21.3 $1.0 $2.51 $6.57
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Power & Chemicals Added GreenN Rem MkWhr Alk. Carbon HouseLb/yr per year MLb/yr Lb/yr Gases
BP2004 0 7.5 0 02006 368,000 9.6 1.9 0 ++2011 15,000 10.7 1.9 640,000 +++
FP2010 0 17 0 02013 445,000 26.5 2.3 915,000 +++
Annual Electrical and Chemical Usage for Nitrogen Removal At NBC WWTF’S