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L 20

Lecture notes of Industrial Waste Treatment (Elective -III) as per syllabus of Solapur university for BE Civil
Prepared by
Prof S S Jahagirdar,
Associate Professor,
N K ORchid College of Engg and Tech,
Solapur

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L 20

  1. 1. L-20 Sludge Disposal Methods Industrial Waste treatment
  2. 2. Definition • “Sludge” is defined as the residual material removed from wastewater treatment facilities. • A new term, “biosolids,” suggests the• A new term, “biosolids,” suggests the beneficial usage of sludge. • The definition of “biosolids” is now accepted as those primarily organic solid products produced by wastewater treatment processes that can be beneficially recycled.
  3. 3. A] SLUDGE TREATMENT • Thickening • Conditioning • Dewatering • Drying • Incineration • Disposal
  4. 4. 1. Thickning • Reduces moisture content of sludge, thereby reducing volume of sludge. • Three types of thickening 1. Gravity thickening 2. Air floatation 3. Centrifugation
  5. 5. GravityGravity Thickening
  6. 6. 2. Conditioning • Conditioning improves the drainability of digested sludge. • Methods adopted – 1. Elutriation (involves passage of air to1. Elutriation (involves passage of air to separate particles) 2. Chemical conditioning (addition of coagulants) 3. Freezing etc.
  7. 7. 3. Dewatering • Purpose is to reduce volume of sludge and increase concentrations of biosolids.biosolids. • Dewatering can be achieved on sand drying beds.
  8. 8. Sludge Processing • Dewatering - removes liquids • Drying beds • solids concentration up to 40% • used for well digested, stabilized residuals• used for well digested, stabilized residuals • Centrifuges • solids concentration 20 to 40 % • rotates liquids at high speeds & spins the water away
  9. 9. Sludge Processing • Vacuum Filters • solids concentration 15 to 30 % • rotating filter media passes through vat of residuals, residuals coat the filter and water is extracted by vacuum, polymers may be usedvacuum, polymers may be used • Pressure filters • solids concentration up to 50% • series of vertical plates, belts, or frames, water squeezed out under pressure, solids are retained between the belts or plates
  10. 10. Sludge drying beds
  11. 11. Sludge drying beds
  12. 12. 4. Heat drying • Reduces water content • Temp @ 350oC • Process carried out in kiln. • Dried sludge used as soil conditioner
  13. 13. Heat drying unit
  14. 14. Sludge Reuse or Disposal Options Incineration • burning sludge at high temperatures in furnace • volume is reduced • ash is stabilized• ash is stabilized • requires air permit & pollutant removal • high operating costs • complex • Temp @ 650oC to 750oC
  15. 15. Sludge Incineration: MultipleMultiple Hearth
  16. 16. Fluidized bed sludge incineration
  17. 17. Incinerator
  18. 18. Sludge Reuse or Disposal Options Landfill • disposal of sludge in a lined landfill • leachate collection required • odor potential • local regulatory requirements • inexpensive • Trucking (Transportation) costs
  19. 19. Sludge Reuse or Disposal Options Surface disposal • trench, waste pile, lagoon • biosolids remain longer than 2 years • surface impoundment• surface impoundment • dedicated disposal sites
  20. 20. Disposal site
  21. 21. Sludge Reuse or Disposal Options Land Application • application of sludge to condition the soil or fertilize crops / other vegetation • sprayed or spread on soil surface • tilled into soil or injected directly below the surface • must be applied at agronomic rates, meet pollutant limits, and pathogen & vector attraction reduction requirements • requires 30 days or more of storage
  22. 22. Land Application
  23. 23. Sludge filling station
  24. 24. Land disposal of sludge
  25. 25. Disposal into the sea
  26. 26. Sludge Lagooning
  27. 27. Sludge lagoons
  28. 28. Economic Aspects
  29. 29. Waste to Wealth
  30. 30. INCORPORATING BIOMASS INTO BRICKSINCORPORATING BIOMASS INTO BRICKSINCORPORATING BIOMASS INTO BRICKSINCORPORATING BIOMASS INTO BRICKS
  31. 31. Objective questions • 1. Sludge drying beds are used for _________ of sludge. • 2. ____________ reduces volume of sludge considerably as compared to other methods. • 3.Pick out odd one w r t sludge• 3.Pick out odd one w r t sludge • Biogas recovery, metal extraction, use in building materials, odour and pathogen
  32. 32. Theory questions • Write detailed note on • 1. Sludge disposal • 2. Sludge drying bed• 2. Sludge drying bed

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Lecture notes of Industrial Waste Treatment (Elective -III) as per syllabus of Solapur university for BE Civil Prepared by Prof S S Jahagirdar, Associate Professor, N K ORchid College of Engg and Tech, Solapur

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