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Wastewater Nitrogen Removal
Bill McAllister, P.E.
AMI Conference on Worker Safety, Human Resources, and the Environment
Kansas City, MO
March 9, 2011
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Presentation Outline
Background
Biological Nitrogen Removal (BNR)
Case Study-Beef Slaughter & Fab Facility
Proprietary BNR Systems Evaluation Basis of Design
Final Process Design
Supplemental Carbon Evaluation Circular Vs Rectangular Basins (Common Wall)
Wastewater Reuse Considerations
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Background
Regulatory Focus on Nutrient Reductions
Nitrogen & Phosphorus
Dead Zones in Coastal Waters
State Issues Drinking Water Protection
Recreation Use Protection
Aquatic Life Protection
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Background
Nitrogen Removal Systems
Biological Nitrogen Removal (BNR) Breakpoint Chlorination
Ammonia Stripping
Ion Exchange Membrane Filtration
Advanced Oxidation
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Biological Nutrient Removal
Biological Nitrogen Removal Mechanisms
Biological Conversion of Nitrogen to Nitrogen Gas Disposal of Biological Waste Sludge
Many BNR Configurations and ProprietarySystems
Conventional Bardenpho Process (Four Stage)
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Biological Nutrient Removal
Four Stage Bardenpho Process
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Case Study
Large Beef Slaughter and Fab Facility
Wastewater Discharge to a Low Flow Stream
Development of a Long-Term Wastewater Plan
Reliable Removal of Ammonia & Nutrients
Provide a Wastewater Quality for Future BeneficialReuse For Plant, Agriculture, and Other Water Needs
Cost Effective
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Case Study
Reviewed & Screened Many PotentialProprietary BNR Systems and Conventional
Activated Sludge
Owner Selected Five Proprietary BNR Systemsto Further Evaluate and Visit Full-Scale
Facilities. Siemens Orbal Process
Schreiber Process
Eimco Carrousel Process
WesTech OxyStreamProcess
Parkson Biolac Process
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Case Study
Siemens Orbal Process
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Case Study
Schreiber Process
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Case Study
Eimco Carrousel & WesTech OxyStream Processes
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Case Study
Parkson Biolac Process
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Case Study
Influent Wastewater Loadings
(Anaerobic Lagoon Effluent)
Parameter Daily Average
Flow, MGD 3.6
CBOD5, mg/L 300TSS, mg/L 800
Ammonia Nitrogen, mg/L 190
Alkalinity, mg/L 1,100
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Case Study
Effluent Quality Requirements
Parameter Value
BOD5, mg/L 16
TSS, mg/L 30pH, s.u 6.0 to 9.0
Ammonia Nitrogen, mg/L 1.2
Nitrite+Nitrate Nitrogen, mg/L 10
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Case Study
Final Process Selection
Conventional Bardenpho Process (Four Stage)
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Case Study
Final Process Size
Process Unit Value
Pre-Anoxic Basin 3,000,000 Gallons
Aeration Basins (each) 3,000,000 Gallons
Minimum Internal Recycle Flow 10,000 GPM
Post-Anoxic Basin 900,000 Gallons
Post-Aeration Basin 50,000 Gallons
Final Clarifiers (each) 90 ft. Diameter
Aerated Sludge Storage & Thickening Basin 900,000 Gallons
Belt Filter Press Capacity 35,000 dry lbs/day
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Case Study
Preliminary Site Plan
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Case Study
Supplemental Carbon Sources
Wastewater Methanol
Proprietary Products
Micro-C (EOS)
BioCarb DN
Unicarb DN (Univar)
Brenntag (Chematron)
Biodiesel Glycerol Waste Other Industrial Byproducts
Must Be Low Nitrogen Product
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Case Study
Methanol Vs Wastewater
Owner Requested a Cost Comparison to Use Either Chemical(Methanol) or Wastewater for the Supplemental Carbon Source(Denitrification Use)
Developed Conceptual Capital and O&M Cost Opinions
Use of Existing Covered Anaerobic Lagoon
Estimated a 2 to 3 Yr Simple Payback For Wastewater
O&M Costs Included Costs for Chemical, Biogas Loss, and Power
Option Capital Cost, $ Annual O&M Cost, $
Methanol 600,000 530,000
Wastewater 1,300,000 230,000
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Case Study
Circular Vs Square Process Basins Owner Requested a Cost Comparison to Construct Four
Circular or Rectangular Basins (common wall). Complete Preliminary Structural Design
Received Construction Costs from a Contractor
Four Circular Basins $4.3 Million Four Square Basins $5.7 Million
Savings For Circular Basins $1.4 Million
Costs Did Not Include:
Excavation and Backfill
Permits
Taxes
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Case Study
Water Reuse Considerations
Project will Include Effluent Water Reuse. Beef Plant Use
WWTF Use
Irrigation (Future)
Chlorinate Beef Plant and WWTF Reuse Water
Beef Plant Uses
Non-Contact Condenser Water
Livestock Pens Washdown Inedible Clean-Up Water
Slaughter & Fab Clean-Up Water (Future???)
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Questions
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