1 / 17

LANDFILLS

LANDFILLS. ENVM 644: New Technologies in Environmental Management Dr. Robert Beauchamp. METHODS OF LANDFILLING. AREA METHOD : EXCAVATION - FLAT SURFACE COMPACTION/LINER SUCCESSIVE LAYERS-WASTE INTERMEDIATE COVER-SOIL . METHODS OF LANDFILLING. RAMP METHOD : FOR SLOPING SURFACE

lilka
Download Presentation

LANDFILLS

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. LANDFILLS ENVM 644: New Technologies in Environmental Management Dr. Robert Beauchamp

  2. METHODS OF LANDFILLING • AREA METHOD: • EXCAVATION - FLAT SURFACE • COMPACTION/LINER • SUCCESSIVE LAYERS-WASTE • INTERMEDIATE COVER-SOIL

  3. METHODS OF LANDFILLING • RAMP METHOD: • FOR SLOPING SURFACE • EXCAVATE WORKING FACE • COMPACTION & COVER WITH SOIL

  4. METHODS OF LANDFILLING • TRENCH METHOD: • EXCAVATE PARALLEL TRENCHES/NO LINER • CONSTRUCT BERMS • TRENCHES PERPENDICULAR TO WIND DIRECTION • COVER WITH SOIL

  5. LANDFILL CAPACITY/AIR SPACE • CAPACITY: • CONSIDERATIONS-AREA TO BE COVERED, DEPTH OF WASTE, RATIO OF WASTE TO SOIL. • RATIO OF 4 TO 1 IS BEST. • AIR SPACE: • THE VOLUME AVAILABLE INTO WHICH WASTE AND COVER CAN BE PLACED.

  6. DISADVANTAGES OF A SANITARY LANDFILL: • AESTHETICS (LITTER) • GASES • LEACHATE • BIRDS • FIRES • ODORS • PESTS • INJURY FROM SCAVENGING.

  7. GAS CONTROL • > 5% = EXPLOSIVE • METHANE KILLS VEGETATION • GAS MIGRATION FOLLOWS PATH OF LEAST RESISTANCE. • BAROMETRIC PRESSURE EFFECTS. • SOIL EFFECTS

  8. GAS RECOVERY SYSTEMS • PASSIVE VENTS • TRENCHES OR GAS VENTED TO ATMOSPHERE. • ACTIVE SYSTEM • REMOVES GAS UNDER VACUUM FROM LANDFILL.

  9. CONTROL GAS MIGRATION • INSTALL RECOVERY WELLS NEAR LANDFILL PERIMETER. • IF METHANE CONCENTRATION > 15% WILL SUPPORT FLAME, GAS CAN BE FLARED • METHANE CONCENTRATION > 35% - RECOVER ENERGY. • NOTE: ANY TRACE CONTAMINANTS CAN BE CAPTURED BY PASSING GAS THROUGH A CARBON FILTER.

  10. LEACHATE CONTROL • WATER PASSING THROUGHWASTE CREATES LEACHATE. • LEACHATE GENERATION: • RATES = AMOUNT OF H2O IN = AMOUNT OF LEACHATE OUT (LAG). • INFLUENCED BY: • CLIMATE • SITE TOPO • VEGETATIVE COVER • FINAL SOIL COVER • OPERATING PROCEDURES

  11. PREDICTING LEACHATE PRODUCTION RATES • PROCEDURE: • CALCULATE A WATER BALANCE • HELP MODEL - CALCULATES A WATER BALANCE- • SIMULATES WATER MOVEMENT.

  12. PREVENTING LEACHATE MOVEMENT INTO UNDERLYING SOIL • REGULATORY AGENCIES REQUIRE LINER TO HAVE A PERMEABILITY < 10-7 CM/SEC.

  13. LEACHATE REMOVAL • = OR > 1 FOOT OF LEACHATE • COLLECTION PIPES TO A STORAGE TANK & REMOVAL.

  14. LEACHATE TREATMENT OPTIONS •  RECYCLING THROUGH THE LANDFILL • ON-SITE TREATMENT • DISCHARGE TO A SEWAGE TREATMENT PLANT. • COMBINATION OF APPROACHES

  15. BIOREACTIVE LANDFILL • REQUIRES SPECIFIC MANAGEMENT & OPERATIOAL ACTIVITIES. • ENHANCE MICROBIAL DECOMPOSITION: • LIQUID ADDITION (LEACHATE IS NOT ENOUGH) • WASTE SHREDDING • pH ADJUSTMENT • NUTRIENT ADDITION • TEMPERATURE MANAGEMENT • WASTE CONDITIONING • AN EXTENTION OF SUBTITLE D LEACHATE-RECIRCULATION OPTION.

  16. BIOREACTOR LANDFILL • EXPERIENCE LFG GENERATION (HIGH RATE SOON AFTER CLOSURE). THEN DECLINES. • CONTAMINATED LEACHATE WILL ALSO DECLINE. • EXTENDED STABILIZATION. • LANDFILL SETTLEMENT (FAST/MORE COMPLETE) • VERY FEW STATES ALLOW THEM

  17. RCRA SUBTITLE D DESIGN • LINER • LEACHET COLLECTION (PLUMBING MAY BE VERY ELABORATE) • GAS COLLECTION (LARGE PIPES, BLOWERS-CONTROL ODORS) • FINAL CAP

More Related