Drinking Water Filtration at a Municipal Water Utility
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Transcript of Drinking Water Filtration at a Municipal Water Utility
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FiltrationFiltrationat the Bloomington, ILat the Bloomington, ILWater Treatment PlantWater Treatment Plant
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Old Plant FiltersOld Plant Filters1929, 1956, 19661929, 1956, 1966
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Old Plant FiltersOld 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
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Old Plant Filters: Influent Trough Old Plant Filters: Influent Trough
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Old Plant FiltersOld Plant FiltersAfter Pressure WashingAfter Pressure Washing
PVC Surface W
ash Piping
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Old Plant Filters:Old Plant Filters:Fixed Surface Wash NozzlesFixed Surface Wash Nozzles
PVC Pipe and Nozzles
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Old Plant Filters: Media RemovedOld Plant Filters: Media Removed
ManifoldLat
erals
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Old Plant Filters: UnderdrainOld Plant Filters: Underdrain
Perforated Cast Iron Lateral Piping :
Uniform Distribution of Backwash Water
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New Plant Filters - 1994New Plant Filters - 1994
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New Plant Filters: GAC CapNew Plant Filters: GAC Cap
24” filter cap replaced with virgin GAC every two years
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New Plant Filters: Influent TroughNew Plant Filters: Influent Trough
Wash Water Trough
Influent Channel and
Wash Water Gullet
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New Plant Filters: Influent TroughNew 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
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New Plant Filters:New Plant Filters:Rotating Surface WashRotating Surface Wash
Surf
ace
Was
h H
eade
r
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New Plant FiltersNew Plant Filters
GAC Removed
Sand Layer Exposed
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Granular Activated CarbonGranular Activated Carbonand Silica Sandand Silica Sand
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BackwashBackwash
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Sand Grab SampleSand Grab Sample
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Filter Core SampleFilter Core Sample
Silica Sand Granular Activated Carbon
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Top / Bottom of Sand LayerTop / Bottom of Sand Layer
top bottom
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New / Old SandNew / Old Sand
New sand is finer; more uniform
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New / Old SandNew / Old Sand
D10 (new) = 0.52 mm D10 (old) = 0.58 mm
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Examination of Old SandExamination of Old SandStereo MicroscopeStereo Microscope
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Examination of Old SandExamination of Old Sand
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Examination of Old SandExamination of Old Sand
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Examination of Old SandExamination of Old Sand
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Examination of Old SandExamination of Old Sand
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Elution of Old SandElution of Old Sand
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Organisms Rinsed from Old SandOrganisms Rinsed from Old Sand
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GAC Grab SampleGAC Grab Sample
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Chain of CustodyChain of Custody
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New / Old CarbonNew / Old Carbon
new old
black grey
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New / Old CarbonNew / Old CarbonOld GAC has lost both ‘fines’ & larger particlesOld GAC has lost both ‘fines’ & larger particles
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Examination of Old CarbonExamination of Old Carbon
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Examination of Old CarbonExamination of Old Carbon
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Examination of Old CarbonExamination of Old Carbon
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Examination of Old CarbonExamination of Old CarbonStalked, Epiphytic Bacteria extend from GAC surfaceStalked, Epiphytic Bacteria extend from GAC surface
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Examination of Old CarbonExamination of Old CarbonBacteria fluoresce under UV illuminationBacteria fluoresce under UV illumination
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Examination of Old CarbonExamination of Old CarbonMicrobial Colonization of GAC SurfaceMicrobial Colonization of GAC Surface
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Examination of Old CarbonExamination of Old Carbon
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Examination of Old CarbonExamination of Old Carbon
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Examination of Old CarbonExamination of Old Carbon
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Replacing Lost SandReplacing Lost Sand
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The Changing of the CarbonThe Changing of the Carbon
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Disinfection after GAC/Sand ReplacementDisinfection after GAC/Sand Replacement