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by Gary S. MacConnell, PE Zack L. Fuller, PE

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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by Gary S. MacConnell, PE Zack L. Fuller, PE

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  1. 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

  2. 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

  3. 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

  4. 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

  5. Problems / Concerns • Aerosols • Health Concerns • Leaking Sand Filter • Treatment Level • Aesthetics • Rain/Freezing

  6. 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

  7. 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

  8. 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

  9. 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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