Taste and Odor Control at the Bloomington Water Treatment Plant Rick Twait Superintendent of Water...
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![Page 1: Taste and Odor Control at the Bloomington Water Treatment Plant Rick Twait Superintendent of Water Purification, City of Bloomington Jill Mayes Water Lab.](https://reader036.fdocuments.us/reader036/viewer/2022070418/5697bf711a28abf838c7e004/html5/thumbnails/1.jpg)
Taste and Odor ControlTaste and Odor Controlat the Bloomingtonat the Bloomington
Water Treatment PlantWater Treatment Plant
Rick TwaitSuperintendent of Water Purification, City of Bloomington
Jill MayesWater Lab Supervisor, City of Bloomington
Dr. John O’Connor, PEOwner, H2O’C Engineering
Tom O’Connor, PEOwner, H2O’C Engineering
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Evergreen Lake + Lake Bloomington1971 (900 acres) 1929 (635 acres)
70:1
29:1
Evaluation of Taste Evaluation of Taste and Odor Control and Odor Control Methods for the Methods for the Bloomington, IL Bloomington, IL
Water Treatment Water Treatment SystemSystem
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Lake and Watershed ManagementLake and Watershed Management
Destratifiers
Lake monitoring
• Algal monitoring
• Volunteer Lake Monitoring Program (VLMP)
Shoreline stabilization
Tiles, streams, ponds; weekly sampling
Wetlands study: nutrient management
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Lake Water Quality ConcernsLake Water Quality Concerns
Algal blooms:
tastes and odors
oxygen depletion (anoxia)
Agricultural drainage:
nutrients, soil erosion
pesticides, herbicides
biological pathogens
Development:
construction, runoff
waste discharges
Lake Aging:
shoreline erosion
sediment accumulation
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Bloomington Water Treatment PlantBloomington Water Treatment Plant
Coagulation Ferric Sulfate + Cationic Polymer
Lime Softening Lime Sludge Lagoons
Stabilization Recarbonation, Polyphosphate
Sand Filtration Granular Activated Carbon caps
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Evergreen Lake - Geosmin/MIB vs. DepthEvergreen Lake - Geosmin/MIB vs. Depth
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Geosmin/MIB - Winter 2004 Geosmin/MIB - Winter 2004
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Lime Sludge Storage LagoonsLime Sludge Storage Lagoons
Supernatant reclaimed to WTP influent
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Geosmin/MIB Geosmin/MIB
< 10% of plant influent
reclaimed from lagoons
control/eliminate lagoon return water
Nov 2004 - Jan 2006
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Water Plant Operational ResponsesWater Plant Operational Responsesfor Taste and Odor Controlfor Taste and Odor Control
• increased dosage of cationic polymer (coagulant)
• reduction in filtration rates to maximize GAC EBCT
• extend filter run times to increase biodegradation
• initiation of maximum PAC feed prior to softeners
• cease prechlorination to avoid lysis of cells
• evaluation of geosmin/MIB reductions through plant
• microscopic analyses to identify algal populations
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Microscopic Microscopic Process Process
EvaluationsEvaluations
Weekly Series: from Lakes & Lagoon to Finished Water Tap
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Most Geosmin/MIB removal occurs during filtration
Geosmin/MIB MonitoringGeosmin/MIB Monitoring
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Removal of Geosmin/MIB by FiltrationRemoval of Geosmin/MIB by Filtration
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Overall Plant Removal of GeosminOverall Plant Removal of Geosmin
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Bloomington, IllinoisBloomington, IllinoisGAC Filter Caps GAC Filter Caps
24-inch deep filter cap replaced with virgin GAC after two years
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Virgin versus Virgin versus Microbially-Microbially-Colonized Colonized
GAC GranulesGAC Granules
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Stalked Bacteria on Granular Activated CarbonStalked Bacteria on Granular Activated Carbon
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Bloomington WTP LaboratoryBloomington WTP LaboratoryColumn Studies of Removal of Geosmin by GACColumn Studies of Removal of Geosmin by GAC
Assessment of Factors Affecting GAC Removal of Geosmin
GAC Age/Condition: virgin GAC (minimal microbial growth)
GAC in service for one-year
GAC in service for two years
Contact Time: GAC in service for two years at twice EBCT
Temperature: winter vs. summer operating conditions
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GAC Column StudiesGAC Column Studies
Geosmin-spiked column influent
GAC columns (4)
Geosmin, TOC sample bottles
Luminescent DO Meter
(oxygen depletion)
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Geosmin-spiked Geosmin-spiked GAC Column InfluentGAC Column Influent
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GAC ColumnsGAC Columns
1. Fresh (Virgin)
2. One-Year-Old
3. Two-Year-Old
4. Two-Year-Old @ twice EBCT
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Removal of Geosmin on GACRemoval of Geosmin on GAC
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Percent Removal of GeosminPercent Removal of Geosmin
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Effect of Temperature on Geosmin RemovalEffect of Temperature on Geosmin Removal
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Turbidity Turbidity of GAC of GAC Rinse Rinse WaterWater
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Microscopic Examination ofMicroscopic Examination ofGAC Rinse Water GAC Rinse Water
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Micrograph: Virgin Carbon ExtractMicrograph: Virgin Carbon Extract
400x400x
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Micrograph: One-Year-Old GACMicrograph: One-Year-Old GAC
400x400x
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Micrograph: Two-Year-Old GACMicrograph: Two-Year-Old GAC
400x400x
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Micrograph: Two-Year-Old GACMicrograph: Two-Year-Old GAC
400x400x
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Additional Testing Additional Testing
Aeration stripping of volatile compounds
Ozonation stripping plus oxidation
Chemical Oxidation
potassium permanganate,
chlorine dioxide,
Fenton’s reagent,
hydrogen peroxide + ultraviolet light
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OzonationOzonationreduces geosmin, but
imparts ozonous odor
AerationAeration 29% geosmin reduction
due to aeration alone
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Application of Potassium Permanganate,
Sodium Chlorite plus Sodium Hypochlorite,
and Fenton’s Reagent failed to noticeably
reduce earthy-musty odors
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Removal of Geosmin by UV-PeroxideRemoval of Geosmin by UV-Peroxide
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Influent Geosmin: 350 ng/l
H2O2 dosage: 30 mg/l
UV dosage: 38 J/cm2
Effluent Geosmin: ND
Removal of Removal of Geosmin by Geosmin by UV-PeroxideUV-Peroxide
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ConclusionConclusion
Predict monitor nutrients, algal populations, dissolved
oxygen, temperature, microcystins, blue-green
pigment, UV254 , and TASTE THE WATER
Pre-empt lake destratification, avoid lagoon recycle
(discharge permit pending), avoid pre-oxidation
Remove GAC adsorption / biodegradation
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AcknowledgementsAcknowledgements
Ron Stanley, lab technician
and the
Staff of the Bloomington Water Treatment Plant