Optimization in Practice - Wisconsin Wastewater … Suspended Solids (DSS, FSS) Vertical Solids...
Transcript of Optimization in Practice - Wisconsin Wastewater … Suspended Solids (DSS, FSS) Vertical Solids...
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Bruce Bartel, NEW Water Nathan Cassity, Donohue
Optimization in Practice: Case Studies from NEW Water’s
Phosphorus and TSS Optimization Plans
WWOA, 51st Annual Conference October 2017
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Outline
Background
Phosphorus Optimization
TSS Optimization
Future/Ongoing Optimization
Acknowledgments NEW Water
• Phil Mentink
• Pat Wescott
• Jake Becken
• Bill Oldenburg
• Aaron Eichhorst
• Matt Hooker
• Jon Strandberg
• Corey Evers
CPE Services
• John Esler
• Tim Miller
Donohue
• Andrew Dow
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Background
2014 permit renewal
Combined permit for Green Bay Facility and De Pere Facility
Part of Lower Fox River TMDL
Included mass allocation limits for P and TSS
Included 9 year compliance schedule
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Background
NEW Water’s Permit Compliance Reports
Operational Evaluation
Report Due: June
2015
Status Report #1
Due: June 2016
Status Report #2
Due: June 2017
Operational Evaluation
Report Amendment
Due: Dec 2017
Pre-Compliance Alternatives
Plan Due: March
2018
Status Report #4
Due: June 2018
Final Compliance Alternatives
Plan Due: Dec 2018
We are here
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Green Bay Facility (GBF)
Design: 49 MGD Current: 32 MGD
Primary Clarifiers
North Aeration
Basins
North Final Clarifiers
South Final Clarifiers
South Aeration Basins
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De Pere Facility (DPF)
Design: 10 MGD Current: 8 MGD
Tertiary Filters
Aeration Basins
Intermediate Clarifiers
Final Clarifiers
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Phosphorus – Combined DPF + GBF
6-month Average Limit: 68 lbs/day
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TSS – Combined DPF + GBF
Monthly Average Limit: 2,404 lbs/day
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Optimization Strategy
Overall Strategy:
Optimize Biological Performance
• Minimize Soluble Phosphorus Discharge
• Minimize Biological Causes of Poor Settling
Identify/Evaluate Potential Clarifier Performance Improvements
Adapt to R2E2 Changes
• Use Biological Optimization and Trouble-Shooting Tools
• Use Supplemental Chemical Polishing as Needed
Optimize Solids Removal (Minimize TSS and TP)
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Phosphorus Optimization
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P Optimization Highlights
Facility Modifications (Aeration Basin Selectors)
Aeration Basin Profile Sampling
Phosphorus Speciation Data Collection
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Facility Modifications
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Selector Sizing Modifications
Phosphorus Action Item (GBF)
Goal: Measure phosphorus performance impact of increasing selector size (additional zone)
Original selectors:
• North Plant Basins: 1 zone each, 2 mixers per zone
• South Plant Basins: 1 zone each, 1 mixer per zone
Selector Additions:
• North Plant Basins: Additional larger zone, 4 mixers each
• South Plant Basins: Additional larger zone, 2 mixers each
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Selector Sizing Modifications
North Plant
South Plant
NEW
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Measuring Facility Modification Impacts
Modified and Un-Modified Basin Operating Simultaneously
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North Complex Performance
Modified Basin Put in Service
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South Complex Performance
Modified Basin Put in Service
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Aeration Basin Profile Sampling
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Basin Profile Sampling
Phosphorus Action Item (GBF)
Goal: Develop EBPR trouble-shooting tool
0
1
2
3
4
5
6
7
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0 200 400 600
Soluble Phosphorus
(mg/L)
Basin Length
P Release: Endogenous
Activity
P Release Ratio: Selector P/Influent P
Parameters of Interest:
• Soluble P
• Ammonia
• Nitrate/Nitrite
• Alkalinity
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December Phosphorus Profiles
1 2 Middle End
1 2 Middle
End
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January Phosphorus Profiles
1 2 Middle End
1 2 Middle
End
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December Nitrogen Profiles
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January Nitrogen Profiles
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Phosphorus Speciation
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Phosphorus Speciation Background
Phosphorus Optimization Action Item
Goals:
• Prioritize strategies for improved phosphorus removal based on the forms of phosphorus in the effluent (soluble vs. particulate, reactive vs. non-reactive)
• Measure impacts of upgrades or piloted improvements
• Document phosphorus speciation profiles in collection system and among industrial contributors to identify potential source reduction priorities
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Phosphorus Speciation Background
Red fraction: Difficult to remove
Dark blue: Conversion to PP
Dark green: Settle/filter
Light green: Settle/filter
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July 2016 Effluent Speciation
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Significant Industrial User Speciation
SIU Focus, 3 Days of Composite Sampling:
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SIU Next Steps
Talk with top contributors (SIUs) to determine sources of phosphorus
Identify pollution prevention strategies for phosphorus reduction
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Clarifier Field Testing
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Clarifier Testing Background
TSS Optimization Action Item
Goal: Identify hydraulic improvements through field testing to improve clarifier performance (TSS performance)
Results of testing used to identify potential clarifier improvements
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Clarifier Field Evaluation
CPE Services
John Esler – founder and president
Specializes in clarifier field evaluations
Author of Field Testing Chapter 7 WEF MOP FD-8
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Green Bay Facility Clarifiers
South Plant
Clarifier #4
North Plant
Clarifiers #5 & #6
#5 #6
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Field Tests
Conducted in April 2016
Timed to fall during elevated spring flows
Dye Tracer Tests
Drogue Current Tests
Dispersed/Flocculated Suspended Solids (DSS, FSS)
Vertical Solids Profiles
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Dye Tracer Tests
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Dye Tracer Tests
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Dye Tracer Tests
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Drogue Current Measurements
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Drogue Current Measurements
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Vertical Solids Profiles
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North - Dye Tracer Test Results
Imbalance in launders
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North - Dye Tracer Test Results
North Plant Clarifier No. 5: Outside weirs favored at elevated flow
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Drogue Current Measurements
North Plant Clarifier No. 5 at elevated flow: strong density currents
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Identified Performance Characteristic
Supporting Field Test Data
Potential Improvement
Density currents: short-circuiting
• Drogue current
measurements
• Dye testing results
• Increase centerwell
diameter to 20-25%
• Reduce centerwell depth
• Install energy dissipating
inlet
• Install mid-radius cylindrical
baffle
Out-of-balance launder: short-circuiting
• Dye testing results
• Replace launders in Clarifier
No. 6
Inboard launder: short-circuiting at perimeter
• Dye testing results
• Replace launders with
launders attached to outer
wall
Potential Improvements – North
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Bruce Bartel, NEW Water Nathan Cassity, Donohue
Optimization in Practice: Case Studies from NEW Water’s
Phosphorus and TSS Optimization Plans
WWOA, 51st Annual Conference October 2017