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Landfill leachate treatment

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Landfill leachate treatment

  1. 1. LANDFILLL LEACHATE TREATMENT METHODS M.Eng Environmental Engineering Carleton University
  2. 2. OVERVIEW• Leachate Generation• Leachate Management (Why? and How?)• Treatment Methods• Future Prospects
  3. 3. LEACHATE COMPOSITION
  4. 4. LEACHATE MANAGEMENT Objective  Eliminate environmental impacts  Satisfy regulatory norms for leachate discharge. (50-200 mg/L COD) Methods Leachate recycling Discharge into municipal wastewater systems Leachate treatment and disposal
  5. 5. TREATMENT TARGETS
  6. 6. Treatment Methods Biological Treatment • Aerobic Treatment • Anaerobic Treatment Physical / Chemical Treatment • Floatation • Coagulation • Adsorption • Membrane Filtration
  7. 7. BIOLOGICAL TREATMENT
  8. 8. AEROBIC TREATMENTSuspended Growth Systems  Lagoons  Activated Sludge Processes  Sequencing Batch ReactorsAttached Growth Systems  Trickling Filters  Moving Bed Biofilm Reactors
  9. 9. AEROBIC TREATMENT
  10. 10. ANAEROBIC TREATMENTSuspended Growth Systems  Digesters ( UASB,EGSB,DSF )Attached Growth Systems  Anaerobic Filter  Hybrid Bed Filter
  11. 11. PHYSICAL / CHEMICALTREATMENT
  12. 12. FLOATATION Sludge Out
  13. 13. COAGULATION Advantages Aluminum sulfate, Ferrous sulfate, Ferric chloride and Ferric chloro-sulfate are commonly used coagulants. Effective for organic compounds and heavy metals. Disadvantages Consistent sludge volume is produced  Increase in concentration of Aluminum or Iron, in the liquid phase, may be observed High pH has to be maintained.
  14. 14. COAGULATION
  15. 15. ADSORPTION Advantages  Design and operating adsorption columns are easy  Availability materials which can be used as adsorbents  (coconut shells, charcoal, zeolite, incinerator ash)  High removal efficiency of > 90% COD Disadvantages  Constant regeneration of activated carbon  Disposal of used carbon  Cost of GAC & PAC
  16. 16. ADSORPTION
  17. 17. MEMBRANE FILTRATIONMicrofiltration (35-40% COD removal)Ultrafiltration (50-70 % COD removal)Nanofiltration (70-90 % COD removal)Reverse osmosis ( > 95 % COD removal)
  18. 18. MEMBRANE FILTRATION
  19. 19. CONCLUSION• A combination of methods need to be used to meet discharge standards.• Activated carbon absorption and reverse osmosis seem to be the best solutions.• Nano particles which can target specific contaminants can be a solution.

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