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Betsy-Jeff Penn 4-H Educational Center: Case Study for the Upgrade of a Recirculating Sand Filter Using Synthetic Media Filters. by Gary S. MacConnell, PE Zack L. Fuller, PE. Original Permit. NPDES Permit Permitted Flow: 8,400 GPD Limits: BOD 5 TSS

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Presentation Transcript
slide1

Betsy-Jeff Penn4-H Educational Center:Case Study for the Upgrade of a Recirculating Sand Filter Using Synthetic Media Filters

by

Gary S. MacConnell, PE

Zack L. Fuller, PE

slide2

Original Permit

  • NPDES Permit
  • Permitted Flow: 8,400 GPD
  • Limits:
  • BOD 5 TSS
  • Monthly Ave 30.0 mg/l 30.0 mg/l
  • Daily Max 5.0 mg/l 45.0 mg/l
  • NH3-N Fecal Coliform
  • Monthly Ave 22.0 mg/l 200 / 100 ml
  • Daily Max N/A 400 / 100 ml
slide3
Flow Diagram

Original Treatment Train

Recirculation Tank

UV Dosing Tank

Flow Splitting Device

Septic Tank

Sand Filter

UV Disinfection

Dosing Chamber with Siphon

Discharge to Carroll Creek

slide4

Deficiencies

  • Dosing Bell - Not Functional
  • Sand Filter - Structural Integrity
  • Spray Distribution - Un-Even
  • Bed – Rocks on Top, Not Able to Clean
  • Sand Media - Clogged
  • Under Drains – Clogged
slide7

Problems / Concerns

  • Aerosols
  • Health Concerns
  • Leaking Sand Filter
  • Treatment Level
  • Aesthetics
  • Rain/Freezing
slide8

Construction Issues

  • Flow Diagram

Old Septic / Dosing Tank

Septic/ Recirc Tank

5 Pretreatment Pods

15 Pretreatment Pods

Septic/ Recirc Tank

Filter

Dosing Tank

UV Dosing Tank

UV Disinfection

Discharge to Carroll Creek

slide13

Benefits of Synthetic Media Filters

  • Uniform Media with Larger Pore Space
  • Enclosed: No Aerosols, Rain, Freezing, Dust
  • No Algae
  • Less Maintenance
  • Media Inexpensive and Easy to Replace
slide14

Modified Permit

  • NPDES Permit
  • Permitted Flow: 13,100 GPD
  • Limits:
  • BOD 5 TSS
  • Monthly Ave 30.0 mg/l 30.0 mg/l
  • Daily Max 45.0 mg/l 45.0 mg/l
  • NH3-N Fecal Coliform
  • Monthly Ave 12.0 mg/l 200 / 100 ml
  • Daily Max N/A 400 / 100 ml
reading taken shortly after project start up

Performance

* Reading taken shortly after project start up.

BOD5 TSS

High 10 mg/l 4.0 mg/l

Low 2.0 mg/l ≤ 2.0 mg/l

Average 3.0 mg/l 2.0 mg/l

NH3-N Fecal Coliform

High 30.0 mg/l* 2.0 / 100 ml

Low 0.30 mg/l ≤1.0 / 100 ml

Average 1.50 mg/l 1.0 / 100 ml

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