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I-70 Greenfield Rest Area Constructed Wetland Wastewater Treatment System Research Project

I-70 Greenfield Rest Area Constructed Wetland Wastewater Treatment System Research Project. R. S. Govindaraju, J. E. Alleman, T. J. Cooper, T. P. Chan, V. Jain School of Civil Engineering Purdue University (SPR-2455, SPR-2456, SPR-2487). March 19, 2004. Project location. AS-2. North

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I-70 Greenfield Rest Area Constructed Wetland Wastewater Treatment System Research Project

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  1. I-70 Greenfield Rest AreaConstructed Wetland Wastewater Treatment System Research Project R. S. Govindaraju, J. E. Alleman, T. J. Cooper, T. P. Chan, V. Jain School of Civil Engineering Purdue University (SPR-2455, SPR-2456, SPR-2487) March 19, 2004

  2. Project location

  3. AS-2 North Rest Stop M-4 F-1 LS-4 LS-1 Effluent Inflow ST-2 ST-1 M-1 F-3 AS-1 LS-3 Recirculation W-1 W-2 AS-4 W-3 Biofield M-3 F-2 M-2 AS-3 LS-2 South Rest Stop Lift station / dosing chamber Septic tank Automatic sampler Wetland cell V-notch weir Magnetic flow meter Design layout

  4. Hydraulic issues • Undersized wetland dosing pumps (LS-1) • Surges from the eastbound side • High rate of recirculation (~83%) • Solutions • Reduce recirculation rate • Addition of surge tank

  5. Flow measurements • Weir / flume measurements are NOT accurate • Backup due to overcapacity of LS-1 and LS-4 • Inadequate calibration • Inherent error due to low flows • Magnetic flow meters • More reliable • Erroneous spikes in the data

  6. 6000 Inflow (M-1) Outflow (M-4) Flume 1 5000 Flume 2 Flume 3 4000 Daily Flow Total (gal) 3000 2000 1000 0 02/01 02/08 02/15 02/22 Date

  7. 9/25/2003

  8. Big Blue River 12000 450 Inflow (M-1) Outflow (M-4) Biofield (M-3) 10000 400 8000 350 Daily Flow Total (gal) 6000 300 Daily Streamflow (cfs) 4000 250 2000 200 0 150 02/01 02/01 02/08 02/08 02/15 02/15 02/22 02/22 02/29 02/29 03/07 03/07 Date

  9. Wastewater test results 12/22/2003

  10. Wastewater test results 3/5/2004

  11. Current status • Only receiving wastewater from west-bound side • No recirculation • Flow-through with no drain-and-fill • Biofield shut down till desired effluent quality is attained

  12. To-do list • Installation of SCADA system • Surge tank addition • Installation of weather station • Re-calibration of weir and flume meters

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