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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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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


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


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


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


Problems / Concerns

  • Aerosols

  • Health Concerns

  • Leaking Sand Filter

  • Treatment Level

  • Aesthetics

  • Rain/Freezing


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


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


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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