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  • 1. Application of the Algal Turf Scrubber® Technology for Point Source and Non Point Source Nitrogen and Phosphorus Control Lower St. Johns Technical Advisory Committee, Jacksonville, FL December 12, 2006 Mark Zivojnovich and Margaret Palmer
  • 2. Phosphorus and Nitrogen Treatment Alternatives POINT SOURCES •Technology Upgrades NON POINT SOURCES •Best Management Practices •Regional Treatment Systems •Chemical Treatment •Managed Aquatic Plant Systems •Treatment Wetlands
  • 3. Algal Turf Scrubber® History
  • 4. Algal Turf Scrubber® (ATS™) Algal Turf Scrubber (ATSTM) (2.0% and 1.5% Slope) ATS™ Pump Station ATS™ Influent Flume and Surgers ATS™ Effluent Flume
  • 5. Algal Turf Scrubber® Inflow
  • 6. Algal Turf Production
  • 7. Algal Turf Production
  • 8. Algal Turf Scrubber® Solids Management
  • 9. Centralized Solids Recovery and Management
  • 10. Algal Residuals Product Applications
  • 11. Compost Production
  • 12. Florida Algal Turf Scrubber® Systems
  • 13. Taylor Creek Algal Turf Scrubber® Regional Stormwater Treatment Facility
  • 14. Taylor Creek Algal Turf Scrubber® - 15 MGD Okeechobee County, Florida
  • 15. Taylor Creek Algal Turf Scrubber® - 15 MGD
  • 16. Taylor Creek Algal Turf Scrubber® - 15 MGD
  • 17. Taylor Creek Algal Turf Scrubber® - 15 MGD
  • 18. Egret Marsh Algal Turf Scrubber® Regional Stormwater Treatment Facility
  • 19. Egret Marsh Algal Turf Scrubber® - 10 MGD Indian River County, Florida
  • 20. Algal Turf Scrubber® Phosphorus Control
  • 21. Algal Turf Scrubber® and Treatment Wetlands Relationship of Phosphorus Mass Loading and Areal Removal Rate
  • 22. Algal Turf Scrubber® Phosphorus Areal Removal Rates for Three ATS™ Units (300’ Floway) Operated at Varying Hydraulic Loading Rates
  • 23. Algal Turf Scrubber® Nitrogen Control
  • 24. Algal Turf Scrubber® Relationship of Nitrogen Inflow Mass Loading and Areal Removal Rate at High HLR
  • 25. Algal Turf Scrubber® Relationship of Nitrogen Inflow Concentration and Areal Removal Rate
  • 26. Nitrogen Areal Removal Rate for Algal Turf Scrubber® and Constructed Treatment Wetlands
  • 27. Algal Turf Scrubber® 50-Yr Present Worth Costs
  • 28. Peer Reviewed Present Worth Costs Sano, D., A.W. Hodges and R. L. Degner. 2005. Economic Analysis of Water Treatment for Phosphorus Removal in Florida: Comparison of Wetland Stormwater Treatment Areas and Managed Aquatic Plant Systems. MAPS phosphorus treatment costs ($/kg P-removed) for proposed treatment systems in the Lake Okeechobee Watershed were 53 – 69% lower than costs for wetland stormwater treatment areas. Costs included capital, operations and management, water storage and recreational benefits. Johns, G. 2005. Cost-Effectiveness of ATS™ Systems with Comparison to RASTAs – Lake Okeechobee Watershed Project. Technical memorandum submitted to SFWMD. “The results shows that regardless of the compost disposition assumption, the discount rate, and the phosphorus concentration of the water as it enters the ATS™ System, the present value cost per pound of phosphorus removed is significantly lower than that of the RASTAs.”
  • 29. Algal Turf Scrubber® Technology Advantages • Increased Pollutant Removal Rates • Reduced Land Requirements • Reduced Treatments Costs • Quantifiable Performance
  • 30. Reduced Land Requirements - Nitrogen [1] HydroMentia. April 2005. Single Stage Algal Turf Scrubber Present Worth Cost & By-Product Market Analysis. (TPIN=311 ppb, LHLR = 18.8 gpm/lf, TNREMOVAL= 6,440 lbs/acre-year) [2] Treatment Wetlands estimated average nitrogen removal rate of 145 lbs/acre-year based on Everglades STA WY 2004 treatment performance.
  • 31. Nitrogen Reduction Cost Effectiveness
  • 32. Technology Applications • Regional Stormwater Treatment Systems • Wastewater Treatment System Upgrades • Surface Water Restoration
  • 33. Opportunity “In the middle of every difficulty lies opportunity.” Albert Einstein