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A Review of State-of-the-Practice Equipment at the Plum Creek WWTP

A Review of State-of-the-Practice Equipment at the Plum Creek WWTP. By Tim Grotheer Plum Creek Wastewater Authority & Dave Oerke RTW Professional Engineers & Consultants, Inc. Presented at the 2002 Joint RMAWWA/RMWEA Annual Conference Steamboat Springs, CO. Presentation Outline.

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A Review of State-of-the-Practice Equipment at the Plum Creek WWTP

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  1. A Review of State-of-the-Practice Equipment at the Plum Creek WWTP By Tim Grotheer Plum Creek Wastewater Authority & Dave Oerke RTW Professional Engineers & Consultants, Inc. Presented at the 2002 Joint RMAWWA/RMWEA Annual Conference Steamboat Springs, CO

  2. Presentation Outline • Quality Equipment • Process Flexibility • Strict Effluent Limits • Design Approach Flexibility

  3. Plum CreekWastewater Authority

  4. PCWA Project Overview • EPA Award Winning WWTP • Expansion from 2.7 to 7.3 MGD • 2X to 3X Growth Expansion • Encroaching Development Near WWTP • Current Organic Load has been 133% of Design at Times

  5. PCWA Project Overview Cont… • Regulatory Issues • Future Ammonia Limit <1.0 mg/l • Future Phosphorus Limit <0.13 mg/l • Downstream use of South Platte Water • Maximum Use of Existing Facilities • Effluent Reuse Potential

  6. PCWA Service Area Population

  7. Organic Loading

  8. Effects of Higher Flows on Concentrations

  9. Planned Facilities • Three Oxidation Ditches and SecondaryClarifiers Capable of BNR • Alum Addition to: • Flocculating Secondary Clarifiers • Floc Basins prior to Tertiary Filters • Filtration & UV Disinfection • Biosolids Handling Facilities • Odor Control • Addition to the Administration Buildingand New Maintenance Building

  10. Site Plan Schematic

  11. Planned Facilities – Oxidation Ditches • BNR with Anaerobic Selectors andAnoxic/Oxic Portions • Flexibility to Vary Detention Time UsingVertical Mixers with VFD Drives

  12. Oxidation Ditch Schematic

  13. Automatic SCADA Aeration Control • Blowers • Single – Stage Centrifuge • Unique Inlet/Outlet Vanes • 3-450 HP (includes 1 standby) • 1-450 HP Future • Significant Power Savings • Match Energy Consumption to: • Influent Flow • Dissolved Oxygen • ORP • Touch-Screen Control Panel • Greater Turndown to 30%

  14. s i n g l e – s t a g e m u l t i – s t a g e p o s i t i v e d i s p 90 80 15% 70 30% i s e n t r o p i c e f f i c i e n c y - % 60 t u r n d o w n l i m i t 50 w w t p 100 90 80 70 60 50 40 % c a p a c i t y

  15. Peak 8360 ACFM476 HP Potential Savings 254,040 HP / YR $13,270/yr @ $0.07/kW $265,414 / 20 YR Min 7840 ACFM447 HP

  16. Planned Facilities – UV Disinfection • Ultraviolet Disinfection • State of the Art • Better Water Quality for Reuse

  17. As wastewater flows increase, phosphorus concentrations must decrease to continue to meet standards. Filtering the water will enable us to meet the standards and Allow unrestricted reuse under Colorado regulations (on parks and open space) Facilitates acceptance of augmentation plans Planned Facilities - Filtration

  18. Planned Facilities – Biosolids • Centrifuges dewater (remove water) from the biosolids • Less available land close in

  19. Planned Facilities – Odor Control • Encroaching development • Original Concept - Chemical Scrubbers • Selected Equipment – Ionization

  20. Design Procedure to EnsureQuality Equipment • Interview Other WWTP Operators • Phone Interviews • Tours • Europe (Germany, Holland, and Great Britain) • United States (Florida, Arizona, and Colorado) • PCWA Staff Preferences • Input from RTW Engineers/Operators

  21. Design Procedure to EnsureQuality Equipment • 8 - Sole Source Specs • 18 Tight Specs Listing ONLY 2 Manufacturers • Challenging Substitution Requirements • Detailed Prequalification of General and I+C Contractors

  22. Project Design Considerations • Cost Reductions: • Odor Control • Filters • Other • Phasing of Equipment to Accommodate Growth • Constructability Review and Value Engineering

  23. Castle Pines NorthGolf Course Other CastlePines Uses Country ClubGolf Course International Golf Course Plum PCWAPlant #1 Creek Woodlands Interceptor TheMeadows FoundersVillage x PCWAPlant #2 (currentlyoff-line) Red Hawk Cedar HillCemetery Downtown DawsonRidge Plum Creek Potential Users & Demands

  24. Summary • Good Proven Equipment • More Streamlined Submittal Process • Easier Startup Process • Significant BNR Activated Sludge Process Flexibility

  25. Summary Cont… • Concrete Tank Savings with Deeper Tanks • Lower Power Consumption • High Quality Effluent • Good Odor Control • Team Effort

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