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Jacobson Helgoth Consultants, Inc.

Jacobson Helgoth Consultants, Inc. Retro-Fit Denitrification for Small Wastewater Treatment Facilities. Tenth Annual Vail Professional Wastewater Operators Seminar Friday, October 29, 2004 Zachary J. Matyja, E.I.T. Jacobson Helgoth Consultants, Inc. Jacobson Helgoth Consultants, Inc.

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Jacobson Helgoth Consultants, Inc.

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  1. Jacobson Helgoth Consultants, Inc. Retro-Fit Denitrification for Small Wastewater Treatment Facilities Tenth Annual Vail Professional Wastewater Operators Seminar Friday, October 29, 2004 Zachary J. Matyja, E.I.T. Jacobson Helgoth Consultants, Inc.

  2. Jacobson Helgoth Consultants, Inc. Retro-Fit Denitrification Improvements • Presentation Outline • Denitrification Process • Improvements at Genesee Water and Sanitation District • Implementation Process • Questions 2

  3. Jacobson Helgoth Consultants, Inc. Retro-Fit Denitrification Improvements Denitrification Process 3

  4. Jacobson Helgoth Consultants, Inc. Retro-Fit Denitrification Improvements • Denitrification Process • Ammonia (NH3) • In WW Process, Nitrogen bonds to Organic Molecules to form Ammonia-Nitrogen (NH3 & NH4) • NH3 Converted to Nitrates in Aeration Process • Nitrates (NO3) • Common in Natural Water • Sources include: Ag Runoff, Organic Matter, WWTF Discharges • 10 mg/L Limit for Drinking Water • Can Cause “blue baby syndrome” 4

  5. Jacobson Helgoth Consultants, Inc. Retro-Fit Denitrification Improvements • Denitrification Process • Denitrification • The biological conversion of nitrate-nitrogen to nitrogen gas (N2), nitrous oxide (N2O), and nitric oxide (NO) • Occurs under anoxic conditions (no free oxygen available) • Various Denitrification Processes • Attached Growth • Proprietary Processes • Single-Sludge Nitrification/Denitrification 5

  6. N2 Gas Influent Effluent Anoxic Zone (Denitrification) Aeration Zone (Nitrification) Jacobson Helgoth Consultants, Inc. Retro-Fit Denitrification Improvements • Single-Sludge Nitrification / Denitrification • All modifications to existing nitrification facility take place in aeration basin • Anoxic Zone precedes Aeration • Internal Water Recycle (400-500% of Influent Flow) RECYCLE 6

  7. Jacobson Helgoth Consultants, Inc. Retro-Fit Denitrification Improvements Effect of Recycle on Nitrate Reduction 7

  8. Jacobson Helgoth Consultants, Inc. Retro-Fit Denitrification Improvements • Denitrification Chemistry • Ammonia First Passes Through Anoxic Zone • Ammonia is Converted to Nitrate in Aeration Zone • Nitrate are Recycled to Anoxic Zone • Nitrate are Converted to Nitrogen gas in Anoxic Zone NO3 Converted to N2 NH3 Converted to NO3 N2 Gas RECYCLE Effluent Influent Anoxic Zone (Denitrification) Aeration Zone (Nitrification) 8

  9. Jacobson Helgoth Consultants, Inc. Retro-Fit Denitrification Improvements • Denitrification Calculations • Conventional Nitrification Calculations Required First • Denitrification Calculations, Solve For • Recycle Ratio • Aerobic / Anoxic Residence Times • Aerobic / Anoxic Tank Volumes • Aerobic / Anoxic Ratio 9

  10. Jacobson Helgoth Consultants, Inc. Retro-Fit Denitrification Improvements Genesee Water and Sanitation District Wastewater Treatment Facility 10

  11. Jacobson Helgoth Consultants, Inc. Retro-Fit Denitrification Improvements • Project Background • In Foothills West of Denver, Near I-70 • District Serves 4,000+ People • Activated Sludge Facility • Discharge to Bear Creek 11

  12. Jacobson Helgoth Consultants, Inc. Retro-Fit Denitrification Improvements • Need for Project • 2002 Drought – Low Flows in Bear Creek • Bear Creek Water Quality for Downstream Users • Potential District Water Quality Problems • Potential Water Reuse • “Stay Ahead of the Game” • Potential Future Nitrate Effluent Regulations 12

  13. Grit Screening D I S C H A R G E Sand Filter Clarifier Clarifier Clarifier Aeration Basins (typ.) RAS Chlorine Jacobson Helgoth Consultants, Inc. Retro-Fit Denitrification Improvements • Existing Wastewater Process Schematic • Two Aeration Basins Operated in Parallel (0.25 MGD Capacity, Each) • Three Secondary Clarifiers Operated in Series 13

  14. Jacobson Helgoth Consultants, Inc. Retro-Fit Denitrification Improvements • Existing Conditions • Activated Sludge Facility • Design Flow 0.5 MGD • Actual Flows ≈0.25 MGD • Achieving Near Complete Nitrification • Previous Average Conditions: • InfluentEffluent Limits • Ammonia (mg/L) 25-40 < 1.0 9-18.5 • Nitrates (mg/L) < 0.5 15-23 None 14

  15. Jacobson Helgoth Consultants, Inc. Retro-Fit Denitrification Improvements • Denitrification Calculation Results • Estimated Recycle Ratio = 295% • Aerobic Residence Time Required = 4.8 hours • Anoxic Residence Time Required = 2.0 hours • Aerobic Tank Volume Fraction = 71% • Anoxic Tank Volume Fraction = 29% 15

  16. Jacobson Helgoth Consultants, Inc. Retro-Fit Denitrification Improvements Denitrification Design Drawings 16

  17. Jacobson Helgoth Consultants, Inc. Retro-Fit Denitrification Improvements • Denitrification Design • Baffle Wall in Aeration Basin • Install Reinforced Flexible Baffle Curtain to Divide Basins • Attached on all sides to Basin • 3’ x 4’ Hole in Bottom Corner • Furnished and Installed by Lange Containment Systems, Inc. 17

  18. Jacobson Helgoth Consultants, Inc. Retro-Fit Denitrification Improvements Baffle Wall Installation 18

  19. Jacobson Helgoth Consultants, Inc. Retro-Fit Denitrification Improvements • Denitrification Design • Submersible Mixer • Ensure Successful Mixing of Entire Anoxic Basin • Primary purpose to keep all solids in suspension, and prevent settling in Anoxic Basin • Evaluated Two Mixers, Flygt required two mixers to accomplish same mixing • Selected USFilter EMU Uniprop 19

  20. Jacobson Helgoth Consultants, Inc. Retro-Fit Denitrification Improvements Mixer Installation 20

  21. Jacobson Helgoth Consultants, Inc. Retro-Fit Denitrification Improvements Denitrification Design Drawings 21

  22. Jacobson Helgoth Consultants, Inc. Retro-Fit Denitrification Improvements • Denitrification Design Drawings • Piping Design From Pump 22

  23. Jacobson Helgoth Consultants, Inc. Retro-Fit Denitrification Improvements • Denitrification Design • Submersible Pump • Designed for 900 gpm, 10’ TDH • 5 hp, 1750 rpm, submersible motor • Guide Rails to Raise Pump • ITT Flygt Submersible Sewage Pump Purchased 23

  24. Jacobson Helgoth Consultants, Inc. Retro-Fit Denitrification Improvements Pump Installation 24

  25. Jacobson Helgoth Consultants, Inc. Retro-Fit Denitrification Improvements • Denitrification Design • Flow Measurement • Electromagnetic Flow Meter – • Endress + Hauser, Promag 50W • Flow Control • Ballcentric Plug Valve with Handwheel Gear – Pratt • Piping and Related Equipment • C900 PVC Pipe, Fittings, and Glue • Ductile Iron Pipe, Fittings, and Hardware • Pipe Hangers, Support Brackets, and Hardware 25

  26. Jacobson Helgoth Consultants, Inc. Retro-Fit Denitrification Improvements Flow and Piping Installation 26

  27. Jacobson Helgoth Consultants, Inc. Retro-Fit Denitrification Improvements • Denitrification Design • Electrical Modifications • Breakers, Starters, Controls • Installed for Pump, Meter, Mixer • Installed by Sub-Contractor 27

  28. Jacobson Helgoth Consultants, Inc. Retro-Fit Denitrification Improvements • Denitrification Installation • Aeration Basin Offline • Basin Power Washed • Diffusers Removed / Plugged • Baffle Wall Installed by Sub-Contractor • Pump, Piping, Mixer Installed • Electrical Hook-up by Sub-Contractor • 200 Man-Hours by District Staff • 100 Man-Hours Electrical Sub-Contractor • 300 Man-Hours Total 28

  29. Jacobson Helgoth Consultants, Inc. Retro-Fit Denitrification Improvements • Denitrification Results at Genesee • Current Recycle Rate set at ≈230% • Effluent Nitrate Levels 3-5 mg/L (78% Reduction) 29

  30. Jacobson Helgoth Consultants, Inc. Retro-Fit Denitrification Improvements • Additional Benefits found at Genesee • A Substantial Decrease in Added Alkalinity Requirements has been Noted • Alkalinity is recovered in Recycled Water in Anoxic Zone • Better Settling and Clarity has been Noted in Clarifiers • A Decrease in Aluminum Sulfate Usage has been Noted • Due to Increased Biological Phosphorous Uptake • More Effective Dewatering Process (Centrifuge) • Reduced Air Requirement in Aeration Basins 30

  31. Jacobson Helgoth Consultants, Inc. Retro-Fit Denitrification Improvements • Negatives to Denitrification found at Genesee • Initial Electrical Consumption has increased 15% • From Pump, Mixer, and Meter Usage • May Decrease because of Reduced Air Requirements • Initial Operation Requirements to Determine Recycle Ratio • More Frequent Monitoring for Filamentous Control in the Anoxic Zone 31

  32. Jacobson Helgoth Consultants, Inc. Retro-Fit Denitrification Improvements • Total Costs • $46,000 for One (0.25 MGD) Aeration Basin Conversion • Engineering – $ 6,500 • Baffle Wall – $ 6,200 • Pump & Equip. – $ 4,900 • Jib Crane & Trolley – $ 1,400 • Mixer & Equip. – $10,300 • Flow Meter – $ 2,900 • Plug Valve – $ 500 • Pipe, Supports, Etc. – $ 3,300 • Electrical – $ 9,900 32

  33. Jacobson Helgoth Consultants, Inc. Retro-Fit Denitrification Improvements Design Implementation 33

  34. Jacobson Helgoth Consultants, Inc. Retro-Fit Denitrification Improvements • Design Implementation • Determine Need • Establish Funding • Engineering Calculations / Design • Equipment / Materials Selection • Determine Resources Available • Installation • Financial / Chemical Changes 34

  35. Jacobson Helgoth Consultants, Inc. Retro-Fit Denitrification Improvements Questions? Zach Matyja zmatyja@jacobsonhelgoth.com Jacobson Helgoth Consultants, Inc. www.jhcinc.com (303) 986-0733 35

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