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Landfill ppt 1

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Landfill ppt 1

  1. 1. SESSION 3 - BIOREACTOR DESIGN and OPERATION Landfill Design & Operation Gregory Richardson, Ph.D., P.E. US EPA WORKSHOP ON BIOREACTORS FEBRUARY 27-28, 2003
  2. 2. Landfill Design & Operation • Design Considerations – liquid collection – impact of liquid on stability – geometry of cell – integration with final closure – integration with LFG collection
  3. 3. Design Considerations - liquid collection• Increased potential for clogging (no fabric, sands or soil in flow path)• Suggest designing for reduced head to provide increased factor of safety
  4. 4. Design Considerations - impact of liquid on stability• Evaluate impact of elevated head on stability• revision of operations manual to reduce potential• limited designer control
  5. 5. Design Considerations - geometry of cell• Recoverable air space?• Long-term interim cover• Higher is probably not better
  6. 6. Design Considerations - integration with final closure• Closure costs exceed $100k/acre• 180-days after final waste placement• Drive for “todays airspace”
  7. 7. Design Considerations - integration with LFG collection• Significant cover penetrations• Impact on “recoverable air space”• Need for final cover?• Ability to expand vertically?
  8. 8. Landfill Design & Operation • Operational Considerations – leachate availability – leachate recirculation methods – degree of automation – liquids balance
  9. 9. Operational Considerations - leachate availability• Larger facilities will actually run out of leachate to recirculate• Need to allow permitted use of waste water treatment liquids
  10. 10. Operational Considerations - leachate recirculation methods• Ponding• Spray on working face• Vertical wells• Horizontal wells
  11. 11. Operational Considerations - degree of automation• Dramatic range of systems - fully automated to manual
  12. 12. Operational Considerations - liquids balance Start Date (Day 1):• Need to maintain Day Rain Max. Leachate Leachate Injection Problems/Weather (Inch) Temp. Generated Recirculated Galleries (Use Extra Sheet if Used Required) 1 2 water balance 3 4 5 records 6 7 8 9 10• No current 11 12 13 requirements 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
  13. 13. Recommended Changes to Subtitle D for Bioreactors• Increase design requirements for leachate collection systems - suggest design for maximum head of 50 cm.• Allow for long-term interim closure• Allow for acceptance of municipal waste water liquids (not sludge)

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