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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. (SPR-2455, SPR-2456, SPR-2487) R. S. Govindaraju, J. E. Alleman, T. J. Cooper, T. P. Chan, V. Jain School of Civil Engineering Purdue University. Project Location. Project Overview.

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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 (SPR-2455, SPR-2456, SPR-2487) R. S. Govindaraju, J. E. Alleman, T. J. Cooper, T. P. Chan, V. Jain School of Civil Engineering Purdue University

  2. Project Location

  3. Project Overview • Surcharges by City • Unique challenges • Long (3+ miles) sewer line to City POTW • Low flush toilets; flow restrictive faucets • High strength wastes (BOD, Ammonia) • Pretreatment using constructed subsurface wetlands • Biofield (and city sewer) for effluent disposal

  4. Why Wetlands? • Conventional technologies • Pros: proven technologies • Cons: high capital and maintenance costs • Subsurface constructed wetlands • Pros: • Low maintenance • Aesthetic • Cons: • Large footprint • Lack of supporting data

  5. Wastewater Charateristics • High strength • BOD~450 mg/L • NH3~150 mg/L • Flow rate • Design: 10,000 GPD • Peak: >20, 000 GPD

  6. Treatment System Design

  7. Treatment System Design (con’t)

  8. Instrumentations • Flow meters • Magnetic flow meters for pressurized flow • Flume and weir flow chambers with ultrasonic level sensors for open channel (gravity) flows. • Automatic samplers at various points of the system • A weather station to measure rainfall, windspeed, and temperature. • Monitoring wells installed within the wetland cells and also at the biofield.

  9. Design Schematic

  10. 1/17/2003

  11. 2/19/2003

  12. 4/15/2003

  13. 6/5/2003

  14. 6/5/2003

  15. 7/10/2003

  16. 7/10/2003

  17. 7/30/2003

  18. 8/12/2003

  19. 8/12/2003

  20. 9/25/2003

  21. 9/25/2003

  22. 9/25/2003

  23. 9/25/2003

  24. Unfinished Items… • Installations of automatic samplers and weather stations • SCADA system • Control, data logging and collection system • Remote (web) access and control

  25. What’s next? • Startup • When? • How? • Startup procedures (provided by RQAW) • Who? • INDOT responsibilities … • Purdue responsibilities … • Long-term monitoring

  26. Research Activities • Dynamic model of the wetland hydraulics • Alternate draw-and-fill scheme; time-varied inflow; recirculation • Model simulations help formulate optimal managementstrategy

  27. Research Activities (con’t) • Survey to rest area operators • compare and evaluate the proposed system to existing treatment technologies • Tracer tests • Evaluation of the effectiveness of the system • Development of design guidelines for constructed wetland systems with specific application in rest area facilities.

  28. On the web http://bridge.ecn.purdue.edu/~wetland

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