Pilot Testing Membranes on GWUDI Well Water: Maximizing Membrane Performance with an UltraClean Sour

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• Pilot Testing Membranes on GWUDI Well Water
  Maximizing Membrane Performance with an
  Ultra-Clean Source Water

Presented by Michelle Johnson, EIT
mjohnson_at_jub.com J-U-B ENGINEERS, Inc.Coeur d
Alene, ID(208) 762-8787
Co-Author Michael Conn, PE mconn_at_jub.com J-U-B
ENGINEERS, Inc.Coeur d Alene, ID(208) 762-8787
Co Author Stephen Tanner Stephen.Tanner_at_deq.idah
o.gov Idaho Department of Environmental
QualityCoeur d Alene, ID(208) 769-1422
2008 Annual PNWS AWWA Conference Vancouver,
Washington April 30 May 2
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Outline and Goals

• History of the Well
• Pilot Study Logistics
• Pilot Study Operation
• Results Conclusions
• Lessons Learned
• Questions

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Enaville Well History

• Located in Enaville, Idaho
• 2 miles from I-90
• Positioned at the confluence of two rivers.

Enaville Well
I-90
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Enaville Well History

• Constructed in 1957
• 6-foot diameter
• 62-feet deep
• Perforated 25 to 30 ft
• 7000 gpm
• Upgrades in 1990s
• Surface Seal
• Casing Extension
• Central Shoshone County primary supply in 1999

Well
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Enaville Well History

• Well GWUDI status came into question in 1999
• MPA analyses
• November 2004 GWUDI Status finalized

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Compliance Strategies

• IDAPA 58.01.08.300 - GWUDI Systems must meet SWTR
  requirements.
• Multiple Technologies Evaluated
• Slow Sand Filtration
• Cartridge Filtration
• Diatomaceous Earth
• Micro/Ultra Filtration Membranes Preferred
  Technology

• Next Phase Pilot Study

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Enaville Well History

• Typical Water Quality Data
• Turbidity 0.2 NTU average (peaks to 1.2 NTU)
• Alkalinity 10 to 30 mg/L
• pH 6.3 to 6.7
• TOC lt1 mg/L
• Temp 5 to 15 C

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Pilot Study Logistics

• Utilities Considerations
• Power Supply
• Water Supply
• Phone Lines
• Wastewater and finished water disposal points
• Other Considerations
• Weather Considerations
• Location in treatment process
• Side by side comparison
• Site Flooding

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Pilot Study Logistics
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Pilot Study Operation

• Pilot Study Operational Protocol (Roadmap for the
  study)
• Goals
• Flux, Operational Pressures, TMP, Permeability
• Full Scale Design Parameters
• Cleaning Routines and Intervals
• Evaluation Criteria
• Meet EPA Requirements
• Turbidity Spiking
• Collect WQ data
• Schedule for Operation

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Pilot Study Schedule

• 8 Week Pilot Duration
• Week 1 Commissioning and Start-Up
• Week 2 Optimization Period
• Week 3 through 6 Optimized Run (verification of
  30 day cleaning cycle.)
• Week 7 Simulated Turbidity Spiking
• Week 8 Continuation of run, evaluation of data
  and decommissioning

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Pilot Study Operation - Layout
Submerged - 1
Pressure - 1
Pressure - 2
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Pilot Study Operation Turbidity Spiking
Batch Tank
Batch Tank 100 NTU
Dilution Tank
Dilution Tank 2-15 NTU
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Pilot Study Operation Batch Tank
Metered into dilution tank, and then pumped to
pilots
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Pilot Study Results Conclusions

• 4. Results Conclusions
• 5. Lessons Learned
• 6. Questions

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Submerged vs. Pressurized Systems
Permeate (pulled by Vacuum)
Permeate (discharged under pressure)
Membrane Fiber bundles (loose in tank)
Membrane Fibers contained in pressurized modules
Raw Water Pumped into Pressurized Membrane Modules
Raw Water pumped into Tank
Submerged Membranes
Pressurized Membranes
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Pilot Study Results Conclusions
Membrane Permeability and Flux Analysis
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Pilot Study Results Conclusions
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Pilot Study Results Conclusions
Full-Scale Design Flux Analysis
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Pilot Study Results Conclusions
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Pilot Study Results Conclusions
Integrity Testing Results
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Pilot Study Costs
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Lessons Learned

• Schedule
• Cleaning Interval
• Permeability Recovery
• Simulated Turbidity Spiking

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Lessons Learned

• Membrane Integrity Testing (MIT) Fiber Damage
• Data Management
• Criteria to be Evaluated
• Backwash and Pre-treatment Systems

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Thanks!
Central Shoshone County Water DistrictIdaho
Department of Environmental Quality
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Questions
Michael Conn, P.E.mconn_at_jub.com
Michelle Johnson, E.I.T.mjohnson_at_jub.com
Stephen Tanner Stephen.Tanner_at_deq.idaho.gov