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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.

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.

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Jacobson Helgoth Consultants, Inc.

Retro-Fit Denitrification Improvements

  • Presentation Outline
        • Denitrification Process
        • Improvements at Genesee Water and Sanitation District
        • Implementation Process
        • Questions

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Jacobson Helgoth Consultants, Inc.

Retro-Fit Denitrification Improvements

Denitrification Process

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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”

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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

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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

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Jacobson Helgoth Consultants, Inc.

Retro-Fit Denitrification Improvements

Effect of Recycle on Nitrate Reduction

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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)

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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

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Jacobson Helgoth Consultants, Inc.

Retro-Fit Denitrification Improvements

Genesee Water and Sanitation District

Wastewater Treatment Facility

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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

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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

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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

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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

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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%

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Jacobson Helgoth Consultants, Inc.

Retro-Fit Denitrification Improvements

Denitrification Design Drawings

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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.

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Jacobson Helgoth Consultants, Inc.

Retro-Fit Denitrification Improvements

Baffle Wall Installation

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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

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Jacobson Helgoth Consultants, Inc.

Retro-Fit Denitrification Improvements

Mixer Installation

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Jacobson Helgoth Consultants, Inc.

Retro-Fit Denitrification Improvements

Denitrification Design Drawings

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Jacobson Helgoth Consultants, Inc.

Retro-Fit Denitrification Improvements

  • Denitrification Design Drawings
        • Piping Design From Pump

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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

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Jacobson Helgoth Consultants, Inc.

Retro-Fit Denitrification Improvements

Pump Installation

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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

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Jacobson Helgoth Consultants, Inc.

Retro-Fit Denitrification Improvements

Flow and Piping Installation

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Jacobson Helgoth Consultants, Inc.

Retro-Fit Denitrification Improvements

  • Denitrification Design
        • Electrical Modifications
          • Breakers, Starters, Controls
          • Installed for Pump, Meter, Mixer
          • Installed by Sub-Contractor

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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

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slide29

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)

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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

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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

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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

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Jacobson Helgoth Consultants, Inc.

Retro-Fit Denitrification Improvements

Design Implementation

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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

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Jacobson Helgoth Consultants, Inc.

Retro-Fit Denitrification Improvements

Questions?

Zach Matyja

zmatyja@jacobsonhelgoth.com

Jacobson Helgoth Consultants, Inc.

www.jhcinc.com

(303) 986-0733

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