a presentation for americas authority in membrane technology first year of operational experience at...
TRANSCRIPT
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A PRESENTATION FOR
America’s Authority in Membrane Technology
First Year of Operational Experience at Tennessee's Largest Membrane Filtration Plant
KYTN Water Professionals ConferenceNashville, Tennessee
July 19, 2010
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Overview
• Background• Design Considerations• Construction• Operation• Costs of Treatment• Summary and Conclusions• Questions
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Background
• Stones River Water Treatment Plant○ Built in 1969, Expanded in 1980○ Capacity of 15.67 MGD○ Lime Softening○ Mixed Media Filtration○ Gaseous Chlorine
Disinfection
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Background
• Project Objectives○ Add Membranes to Treatment○ Expand Capacity to 20 MGD○ Chemical Feed Replacement○ Additional Clearwell Storage○ New High Service Pumping○ Renovate Filters for GAC
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Design Considerations
• New Test Developed to Estimate Flux
Murfreesboro MPI=0.03
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Design Considerations
Pilot Testing Results
• Stable Performance at 87.5 gfd for 2 months• Stable Performance at 120 gfd for 1 week• Stable Performance at 99% Recovery for 2 weeks• Stable Performance w/o EFM for 1 week• Easy Removal of Polymer Fouling• 99.5% Permeability Recovery
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Design Considerations
Membrane Design Criteria
• Design Flux- 87.5 gfd @ 95% Recovery• Design Temperature- 4 deg Celcius• Cleaning Interval- Once/month• Enhance Flux Maintenance- Once/day• Membrane Warranty- 10 Years Prorated
○ Irreversible Loss of Permeability >15%○ Fiber Breakage >0.2%
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Pre-Construction
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Construction
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Construction
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Completion
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Turbidity
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Turbidity
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pH
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Hardness
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Alkalinity
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TOC Removal
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TOC Removal
Average Raw
Average Filtered
Average % Removal
Before Membranes Installed 3.01 1.93 35.83
After Membranes Installed 3.57 2.02 43.47
After GAC Installed 3.03 1.59 47.46
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Quarterly DBPs
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Daily TTHMs
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Operation
• Operated one Rack at Design Flux for one year
• Turbidity Excursion• Fouling on Rack 6• Issues with Cleaning regime • Fiber Breakage
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Typical Month- Rack 2
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Typical Month- Rack 2
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Typical Month- Rack 6
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Typical Month- Rack 6
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Turbidity Excursion- Rack 2
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Turbidity Excursion- Rack 2
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Turbidity Excursion- Rack 6
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Turbidity Excursion- Rack 6
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Cleaning Issues- Rack 2
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Cleaning Issues- Rack 2
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Cleaning Issues- Rack 6
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Cleaning System Issues
• Programming Issues• Hypochlorite Solution Strength was low• Water Temperature was low • Recirculation Time insufficient• EFMs had been suspended
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Chemical Costs
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Chemical Unit Prices
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Chemical Costs
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Chemical Costs
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Coagulant Costs
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Post Treatment Chemicals
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Membrane Cleaning Chemicals
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Electric Costs
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Electric Costs
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Power Analysis
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Static Strainer
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Static Strainer
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Static Strainer
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Static Strainer
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Fiber Breakage
• Total Number of Fibers- 3,125,000• Total Number of Fiber Breaks in Year 1= 5
○ All five were in two modules in one rack in one day
• Percentage of Breakage- 0.00016%• Percentage of Breakage in affected 2
modules= 0.04%• San Patricio – 0.00030% over 5 years
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GAC Effervescence
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GAC Effervescence
• Potential Causes○ Temperature Change and DO Saturation○ Leak in Air Scour System○ Air in GAC Effluent Line○ Biological Activity○ Air in Membrane Permeate Header
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GAC Effervescence- Actual Cause
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Summary and Conclusions
• Evaluate All Costs and Design Considerations of Membrane System When Evaluating
• Lime Softening is an Excellent Pretreatment for Membranes
• Membrane Warranty Should Define a Failure According to Fiber Breakage and Irreversible Fouling
• Verify the Effectiveness of Every Clean
• Membranes Are a Great Tool, Not a Magic Bullet
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Acknowledgements