1. A PRESENTATION FOR Americas Authority in Membrane Technology First Year of Operational Experience at Tennessee's Largest Membrane Filtration Plant KYTN Water Professionals Conference Nashville, Tennessee July 19, 2010

2. Overview Background Design Considerations Construction Operation Costs of Treatment Summary and Conclusions Questions

3. 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

4. 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

5. Design Considerations New Test Developed to Estimate Flux Murfreesboro MPI=0.03

6. 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

7. 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%

8. Pre-Construction

9. Construction

11. Completion

12. Turbidity

14. pH

15. Hardness

16. Alkalinity

17. TOC Removal

19. Quarterly DBPs

20. Daily TTHMs

21. Operation Operated one Rack at Design Flux for one year Turbidity Excursion Fouling on Rack 6 Issues with Cleaning regime Fiber Breakage

22. Typical Month- Rack 2

24. Typical Month- Rack 6

26. Turbidity Excursion- Rack 2

28. Turbidity Excursion- Rack 6

30. Cleaning Issues- Rack 2

32. Cleaning Issues- Rack 6

34. Cleaning System Issues Programming Issues Hypochlorite Solution Strength was low Water Temperature was low Recirculation Time insufficient EFMs had been suspended

37. Chemical Costs

38. Chemical Unit Prices

39. Chemical Costs

41. Coagulant Costs

42. Post Treatment Chemicals

43. Membrane Cleaning Chemicals

44. Electric Costs

46. Power Analysis

47. Static Strainer

51. 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

52. GAC Effervescence

53. Potential Causes Temperature Change and DO Saturation Leak in Air Scour System Air in GAC Effluent Line Biological Activity Air in Membrane Permeate Header

54. GAC Effervescence- Actual Cause

55. 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

56. Acknowledgements

57. Questions? Mike Bernard, PE (615) 460-0582 MBernard@ssr-inc.com