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Kent a lackey, pe ; black & veatch international company

2013 Nc awwa-wea annual conference concord, north carolina successful commissioning of the largest cloth disk filter installation in the united states. Kent a lackey, pe ; black & veatch international company. acknowledgements. Tom Hardy , MSDBC Ed Bradford , MSDBC Peter Weed , MSDBC

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Kent a lackey, pe ; black & veatch international company

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  1. 2013 Ncawwa-wea annual conferenceconcord, north carolinasuccessful commissioning of the largest cloth disk filter installation in the united states Kent a lackey, pe; black & veatch international company

  2. acknowledgements Tom Hardy, MSDBC Ed Bradford, MSDBC Peter Weed, MSDBC Dennis Lance, MSDBC Mike Schraven, MSDBC John Kiviniemi, OWASA David Hart, B&V Todd Briggeman, B&V

  3. Presentation outline Background Disk Filter Pilot Testing Tertiary Treatment Design • Disk Filter Procurement Contract • Disk Filter Facility Design Construction, Startup and Testing Results

  4. BackgroundFrench broad river Pollution Control Facility Secondary Microscreen Facility Facility: Pre-Project

  5. Backgroundgeneral process flow Secondary Microscreen Facility Rotating Biological Contactors Chlorine Contact Chamber Intermediate Clarifier Intermediate Pumps

  6. Project backgroundwhy replace the microscreens Microscreen Facility Before Construction System was Failing and Provided Ineffective Treatment

  7. Project backgroundwhy replace the microscreens • Replacement Parts were Hard to Find • Several Units Out of Service Microscreen Facility Before Construction

  8. Backgroundwhy replace the microscreens Needed a Reliable Form of Treatment • Disk Filters will Provide More Effective Treatment with Higher Level of Reliability Enhance Disinfection

  9. Backgrounddisk filter technology

  10. disk filter Pilot TestingGoals and objectives Goals: • Validate Disk Filters can Reliability Meet Effluent NPDES Permit Requirements for TSS • Evaluate Available Technologies • Establish Design Critera MSD Completed a Competitive Pilot • Aqua Aerobics AquaDisk • Outside-In Flow • Kruger HydrotechDiscfilter • Inside-Out Flow

  11. disk filter Pilot testingSystem Differences “Outside-in” vs. “Inside-out” Submerged vs. partially exposed Pile cloth vs. fabric membrane Control system Backwash system

  12. disk filter pilot testingparticle size distribution results

  13. disk filter pilot testingsummary and conclusions AquaDisk Outperformed HydrotechDiscfilter • Better Removal of TSS and Turbidity • Better Performance under High Solids Loading • Removed more Particles < 10 microns Conclusions • AquaDisk less Susceptible to Blinding under High Loading • AquaDisk more Easily Retrofitted into Existing Secondary Microscreen Tanks • AquaDisk Designed for Gravity Flow-Through Type Similar to Existing Microscreens • AquaDisk Provides Standard PLC Based Control System

  14. Tertiary treatment designdisk filter procurement Procurement Highlights • Sole Source Procurement • Allows for Customized Design • Optimize Design w/ Manufacturer • MSD gets the Best Equipment • Increased Value for MSD • Consolidated Control System • Consolidated Backwash System

  15. Tertiary treatment designdisk filter procurement System Configuration • Aqua Generally Uses a “Modular” Design • Two Backwash Pumps per Unit • Control Panel for Each Unit • One Unit per Basin • Customized Design • Two Units per Basin • Quad Configuration • Consolidated Backwash (Two Pumps per Four Units) • Consolidated Controls (One Control Panel for Four Units) Procurement Highlights

  16. Tertiary treatment designdisk filter facility design Design Criteria • Capacity: • 10 mgd Min Hour Flow • 40 mgd Max Month Design Flow • 65 mgd Peak Flow • 70 mgd Max Hydraulic Capacity • Process Equipment • 16 Disk Filter Units • 4 Quads • 4 Units per Quad • 12 Disks per Unit • Cloth: Polyethylene (Chlorine Tolerant)

  17. Tertiary treatment design Existing microscreens • Microscreens removed to open up individual cells • Note Flow Path

  18. Tertiary treatment design Cloth disk filter layout • Note new flow path • Additional Chlorine contact area (green)

  19. Tertiary treatment designDisk Filter facility design Old Secondary Microscreen Cell Size Additional Chlorine Contact Chamber Disk Filter Quad

  20. Tertiary treatment designDisk Filter facility design Cloth Filter Backwash Pump Cloth Filter

  21. Tertiary treatment designDisk Filter facility design Cloth Filter Backwash Pump Cloth Filter

  22. Tertiary treatment construction • Individual Cells cleaned • New construction begins NEW WALL

  23. Tertiary treatment construction Additional Demolition beneath Elevated Slab New, open Chlorine contact area beneath new slab

  24. Tertiary treatment construction Control valves for individual filter backwashing and sludge collection Backwash pumps and piping

  25. Tertiary treatment construction Complete Filter Assembly

  26. Startup • Calibration • Draw-down testing • Backwash testing • Alarms/SCADA Target 10 mg/L

  27. Continued Successful operation Equipment Cost: $5,216,442 Total Facility Cost: $8,937,108

  28. questions???Acknowledgements Ed Bradford, msdbc Peter Weed, msdbc Mike Schraven, MSDBC John kiviniemi, owasa David hart, B&V

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