10 BNR Upgrade Project Why Upgrade in 2011? PA DEP Bay Strategy Biological Nutrient Removal (BNR) Reduce Nitrogen and Phosphorous discharges to the Chesapeake Bay
11 BNR Upgrade Project 2011 BNR Upgrade BNR Strategy The main goal of this project was to design a BNR systemthat would meet the new effluent requirements withoutincurring the substantial expense of building new tanks(about 25 % more expensive).
12 BNR Upgrade Project Integrated Fixed Film System (IFAS) Conventional Aeration Systems – Microorganisms are suspended in tankIFAS Systems – Microorganisms are attached to a suspended media; media offers greater surface area for microorganisms to growMore microorganisms:Provide higher degree of treatmentCan offset the need for additional aeration basin capacity
13 BNR Upgrade Project Kruger IFAS System Media Facts -38% Fill -85,000 CF- 274 SF/CF-23M SF- 536 ACRES
14 BNR Upgrade Project BNR System Site Plan North Train Influent To 2nd ClarifiersAnaerobicAnaerobicAnoxic Stage #1(N1)Oxic (IFAS)Stage #2(N2)OxicStage #3(N3)Sludge Digesters(N4)AnaerobicInfluentInternal Nitrate RecycleInternal Nitrate RecycleAnaerobicAnoxic Stage #1(N1)Oxic (IFAS)Stage #2(N2)OxicStage #3(N3)Sludge Digesters(N4)AnaerobicAnaerobicRASSouth TrainTo 2nd Clarifiers
15 BNR Upgrade Project Media Retention Screens - 50 Screens -16” Diameter -10’ Long
16 BNR Upgrade Project Additional Upgrades Required New High Efficiency Diffused Air SystemBlowers and Blower BuildingInternal Mixed Liquor Recycle PumpsConversion of Primary Clarifiers to Anaerobic/ Anoxic Selectors (anaerobic portion for phosphorous removal; anoxic portion for nitrogen removal)
17 BNR Upgrade Project Additional Plant Considerations Motor Control Center (MCC) UpgradeEmergency Power UpgradeFinal Clarifier ImprovementsCurrent Density BafflesAlgae Control SystemHeadworks Screening System UpgradeRelocated Septage Dump Station
18 BNR Upgrade ProjectInfluent Screening is CRITICAL3 mm opening
26 Administration Addition "Green" FeaturesUse of Regional Materials for ConstructionNew High Efficiency Geothermal Heating/ CoolingEnergy Efficient Windows throughout BuildingPassive Heating in Conference RoomDay Lighting Throughout Entire Addition
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