Wastewater Nitrogen Removal

Transcription

1 Wastewater Nitrogen Removal Bill McAllister, P.E. AMI Conference on Worker Safety, Human Resources, and the Environment Kansas City, MO March 9, 2011

2 Outline Presentation Background Biological Nitrogen Removal (BNR) 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

3 Background Regulatory Focus on Nutrient Reductions Nitrogen & Phosphorus Dead Zones in Coastal Waters State Issues Drinking Water Protection Recreation Use Protection Aquatic Life Protection

4 Background Nitrogen Removal Systems Biological Nitrogen Removal (BNR) Breakpoint Chlorination Ammonia Stripping Ion Exchange Membrane Filtration Advanced Oxidation

5 Nutrient Removal Biological Biological Nitrogen Removal Mechanisms Biological Conversion of Nitrogen to Nitrogen Gas Disposal of Biological Waste Sludge Many BNR Configurations and Proprietary Systems Conventional Bardenpho Process (Four Stage)

6 Nutrient Removal Biological Four Stage Bardenpho Process

7 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 Beneficial Reuse For Plant, Agriculture, and Other Water Needs Cost Effective

8 Reviewed & Screened Many Potential Proprietary BNR Systems and Conventional Activated Sludge Owner Selected Five Proprietary BNR Systems to Further Evaluate and Visit Full-Scale Facilities. Siemens Orbal Process Schreiber Process Eimco Carrousel Process WesTech OxyStream Process Parkson Biolac Process

9 Study Siemens Orbal Process

10 Schreiber Process

11 Eimco Carrousel & WesTech OxyStream Processes

12 Parkson Biolac Process

13 Influent Wastewater Loadings (Anaerobic Lagoon Effluent) Parameter Daily Average Flow, MGD 3.6 CBOD 5, mg/l 300 TSS, mg/l 800 Ammonia Nitrogen, mg/l 190 Alkalinity, mg/l 1,100

14 Effluent Quality Requirements Parameter Value BOD 5, mg/l 16 TSS, mg/l 30 ph, s.u 6.0 to 9.0 Ammonia Nitrogen, mg/l 1.2 Nitrite+Nitrate Nitrogen, mg/l 10

15 Final Process Selection Conventional Bardenpho Process (Four Stage)

16 Final Process Size Process Unit Pre-Anoxic Basin Aeration Basins (each) Minimum Internal Recycle Flow Post-Anoxic Basin Post-Aeration Basin Final Clarifiers (each) Aerated Sludge Storage & Thickening Basin Belt Filter Press Capacity Value 3,000,000 Gallons 3,000,000 Gallons 10,000 GPM 900,000 Gallons 50,000 Gallons 90 ft. Diameter 900,000 Gallons 35,000 dry lbs/day

17 Preliminary Site Plan

18 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

19 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 Wastewater 1,300, ,000

20 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

21 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???)

22 Questions