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Deep Bed Denitrification Performance. Cold Weather Operation for Two Northeast WWTPs Presented by: Gary M. Lohse, P.E., Severn Trent Services Ken Wineberg, Severn Trent Services. The Nitrogen Cycle via Biological Processes. ORGANIC NITROGEN (Proteins, Urea, etc.). Bacterial

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deep bed denitrification performance

Deep Bed Denitrification Performance

Cold Weather Operation for Two Northeast WWTPs

Presented by: Gary M. Lohse, P.E., Severn Trent Services

Ken Wineberg, Severn Trent Services

the nitrogen cycle via biological processes
The Nitrogen Cyclevia Biological Processes

ORGANIC NITROGEN

(Proteins, Urea, etc.)

Bacterial

Decomposition

& Hydrolysis

AMMONIA NITROGEN

ORGANIC NITROGEN

(Bacteria Cells)

ORGANIC NITROGEN

(Net Growth)

O2

Lysis & Auto Oxidation

NITRITE (NO2-)

O2

Denitrification

NITRATE (NO3-)

NITROGEN GAS (N2)

Organic Carbon

slide3

Deep Bed Denitrification Filter General Overview

  • Dissolved nitrate (NO3) is converted to nitrogen gas (N2)
  • Heterotrophic bacteria
  • - Use the O in NO3- as final e- acceptor when free dissolved O2 is not available (anoxic environment)
  • - Need organic carbon source for energy and cell-building
  • - Easy to stop and start
  • - Prefer pH range is neutral – works in range of ~ 6.0 to 8.2
  • - Need nutrients such as P, often already available in wastewater
  • - Reaction rate affected by temperature, carbon source & potential toxins
slide4

Deep Bed Denitrification

Severn Trent Services 4

deep bed denitrification filter profile of components
Deep Bed Denitrification Filter - Profile of Components

Media

Support Gravel

Underdrain

BW Air Header

BW Air Lateral

Sump Cover Plate

Sump

deep bed denitrification filter underdrain system
Deep Bed Denitrification Filter - Underdrain system

Support Media and Gravel

Handle Hydraulic Shocks – minimize possible damage to filter internals

Minimize Potential Pluggage in Applications with High Solids Loading or Biological Activity

Collect Filtrate in Normal Operating Mode

Helps Evenly Distribute BW Air & Water Across Entire Area of the Filter Bed

deep bed denitrification filter air water flow through underdrain
Deep Bed Denitrification Filter - Air & Water Flow through underdrain

Downflow Operating Mode

Upflow Backwash Mode

deep bed denitrification filter air water distribution system
Deep Bed Denitrification Filter - Air & Water Distribution System
  • Stainless Steel Box Header
  • Air Laterals, Stainless Steel
    • Protected from Gravel & Media
    • Located Under Snap T BlockTM Arch
    • Located under every other row
  • Water Slot in Sump Cover
    • Located under every other row, where there is no air lateral
deep bed denitrification filter methanol carbon system
Deep Bed Denitrification Filter - Methanol (carbon) System
  • Tank Volume Standard 21-30 Day Supply @ Average Flow
  • Tank Continuous Level Measurement
    • Tank Low and High Level
  • Methanol Pumps
    • Diaphragm
    • Peristaltic
supplemental carbon control
Supplemental Carbon Control

Flow Meter

Influent

Denitrification

Filters

Effluent

FE

Influent

Sample

Nitrate

Analyzer

Effluent

Sample

Controller

(MMI)

Carbon

Feed Pump

deep bed denitrification filter backwash solids removal
Deep Bed Denitrification Filter - Backwash (Solids Removal)

3 Basic Cycles

Backwash Air Only:

- 1 to 3 min

- Backwash Air Rate of 5 CFM/ft2

Backwash Air/Water Scour:

- 10 to 15 min (trough overflow time)

- Backwash Air Rate of 5 CFM/ft2

- Backwash Water Rate of 6 GPM/ft2

Backwash Water Only Rinse:

- 5 min

- Backwash Water Rate of 6 GPM/ft2

slide18
Factors Affecting Denitrification Filter Design
  • Influent NO3-N Concentration
  • Dissolved Oxygen (DO) Concentration

 Low DO Preferred

  • Carbon Source Characteristics & Availability
  • Alkalinity: 50 PPM+ Preferred
  • pH Range: 6-8.2 Preferred

 7.0-7.5 Optimum

  • Presence of Nutrients and/or Toxins
  • Temperature
  • Reaction Time: Empty Bed Detention Time (EBDT)
denitrification filter design criteria
Denitrification Filter Design Criteria

Design Value

Average flow: 1.60 mgd

Max day flow: 2.36 mgd

Peak hour flow: 4.34 mgd

Average TSS: 15 mg/L

Average NO3-N: 13 mg/L

Temperature: 8 deg Celsius

Plant Effluent

TSS: 5 mg/L

NO3-N: 0.5 mg/L

TN: 4 mg/L

Denitrification Filters

Average hydraulic loading 1.22 gpm/sf

Peak hydraulic loading 3.30 gpm/sf

12 month rolling average

slide22

Methanol System

Scituate WWTP

Filter System

average operating data april 2001through november 2006
Average Operating DataApril 2001Through November 2006

Flow Rate

Average: 1.22 mgd

Max day: 3.54 mgd

Peak hour: 4.20 mgd

Plant Effluent (Average)

CBOD: 3.1 mg/L

TSS: 4.5 mg/L

TN: 2.9 mg/L

Denitrification Filters

Average hydraulic loading: 0.70 gpm/sf

Peak hydraulic loading: 2.40 gpm/sf

12 month rolling average

allegany county md celanese wwtp
Allegany County, MDCelanese WWTP

2.86 MGD Design

Clarifiers

Single Stage

Activated

Sludge

Denitrification

Filters

Head

Works

denitrification filter design criteria1
Denitrification Filter Design Criteria

Design Value

Average flow: 1.66 mgd

Max Month flow: 2.86 mgd

Peak hour flow: 6.6 mgd

Average TSS: 30 mg/L

Average NO3-N: 26 mg/L

Temperature: 11 deg Celsius

Plant Effluent

TSS: 5 mg/L

NO3-N: 2 mg/L

TN: 3 mg/L

Denitrification Filters

Average hydraulic loading 2.6 gpm/sf

Peak hydraulic loading 6.0 gpm/sf

Annual Average

additional cold weather deep bed denitrification filters
Additional Cold Weather Deep Bed Denitrification filters
  • New York – 2
  • Pennsylvania – 2
  • Maryland – 5
  • Virginia – 8
  • Massachusetts – 4
  • Colorado – 1
  • California – 2 (High Elevations)
conclusion
Conclusion
    • Deep beds allow maximum ability for solids to be captured providing for consistently low TSS and turbidity effluents with a varying load of TSS
  • Filter media becomes attachment site for denitrifying bacteria in which dissolved nitrate (NO3) is converted to nitrogen gas (N2) providing nitrogen removal through a biological process
  • Need organic carbon source for energy and cell-building and nutrients such as P, often already available in wastewater
  • Backwash water is typically only 2 – 4 % of forward flow. Lower backwash consumption and recycle cuts plant operating costs and increases plant capacity.
  • Reaction rate affected by temperature, carbon source & potential toxins
  • Deep Bed Denitrification filters can achieve TSS of below 4 mg/l and TN limits of below 3 mg/l even in cold climates
cold weather deep bed denitrification filters
Cold Weather Deep Bed Denitrification Filters

Questions??????

CONTACT:

Gary M. Lohse, P.E.

Regional Sales Manager

Severn Trent Services

3000 Advance Lane

Colmar, Pa 18915

Cell: (215) 859 - 3814

Direct: (215) 997-4052

Fax: (215) 997-4062

Email: [email protected]

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