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Filtration at the Bloomington, IL Water Treatment Plant

Filtration at the Bloomington, IL Water Treatment Plant. Old Plant Filters 1929, 1956, 1966. Old Plant Filters. • Filters #1-12: GAC-Capped Sand • 435 square feet per filter (20 ’ x 21.75 ’ ) • Operated at a flow rate of ~ 1 gpm/ft 2 • Fixed surface wash nozzles.

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Filtration at the Bloomington, IL Water Treatment Plant

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  1. Filtrationat the Bloomington, ILWater Treatment Plant

  2. Old Plant Filters1929, 1956, 1966

  3. Old Plant Filters • Filters #1-12: GAC-Capped Sand • 435 square feet per filter (20’ x 21.75’) • Operated at a flow rate of ~ 1 gpm/ft2 • Fixed surface wash nozzles

  4. Old Plant Filters: Influent Trough

  5. Old Plant FiltersAfter Pressure Washing PVC Surface Wash Piping

  6. Old Plant Filters:Fixed Surface Wash Nozzles PVC Pipe and Nozzles

  7. Old Plant Filters: Media Removed Laterals Manifold

  8. Old Plant Filters: Underdrain Perforated Cast Iron Lateral Piping : Uniform Distribution of Backwash Water

  9. New Plant Filters - 1994

  10. New Plant Filters: GAC Cap 24” filter cap replaced with virgin GAC every two years

  11. New Plant Filters: Influent Trough Wash Water Trough Influent Channel and Wash Water Gullet

  12. New Plant Filters: Influent Trough • Filters #13-18 • Dual-cell filters • 462 square feet per filter (10.75’ x 21.5’ x 2 cells) • Operated at a flow rate of ~ 2 gpm/ft2 • Rotating surface wash

  13. New Plant Filters:Rotating Surface Wash Surface Wash Header

  14. New Plant Filters GAC Removed Sand Layer Exposed

  15. Granular Activated Carbonand Silica Sand

  16. Backwash

  17. Sand Grab Sample

  18. Filter Core Sample Silica Sand Granular Activated Carbon

  19. Top / Bottom of Sand Layer top bottom

  20. New / Old Sand New sand is finer; more uniform

  21. New / Old Sand D10 (new) = 0.52 mm D10 (old) = 0.58 mm

  22. Examination of Old SandStereo Microscope

  23. Examination of Old Sand

  24. Examination of Old Sand

  25. Examination of Old Sand

  26. Examination of Old Sand

  27. Elution of Old Sand

  28. Organisms Rinsed from Old Sand

  29. GAC Grab Sample

  30. Chain of Custody

  31. New / Old Carbon new old black grey

  32. New / Old CarbonOld GAC has lost both ‘fines’ & larger particles

  33. Examination of Old Carbon

  34. Examination of Old Carbon

  35. Examination of Old Carbon

  36. Examination of Old CarbonStalked, Epiphytic Bacteria extend from GAC surface

  37. Examination of Old CarbonBacteria fluoresce under UV illumination

  38. Examination of Old CarbonMicrobial Colonization of GAC Surface

  39. Examination of Old Carbon

  40. Examination of Old Carbon

  41. Examination of Old Carbon

  42. Replacing Lost Sand

  43. The Changing of the Carbon

  44. Disinfection after GAC/Sand Replacement

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