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Recycled Water Distribution System Challenges

Recycled Water Distribution System Challenges. Lee Cesario, P. E. Denver Water lee.cesario@denverwater.org. Challenges. Recycled water systems are in some ways different than potable systems. Demand Patterns/Scheduling Design Construction Operations Regulations Changes for the Utility.

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Recycled Water Distribution System Challenges

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  1. Recycled Water Distribution System Challenges Lee Cesario, P. E. Denver Water lee.cesario@denverwater.org

  2. Challenges • Recycled water systems are in some ways different than potable systems. • Demand Patterns/Scheduling • Design • Construction • Operations • Regulations • Changes for the Utility

  3. Distribution System Components • Treatment • Storage • Reservoirs/tanks, ponds • Pumping • From storage and from pipe • Piping • Transmission, distribution, service lines • Dechlorination • Valves • Control, pressure regulating, line (isolation), • Air valves, blow-offs

  4. System and Potential Customers

  5. Customers • Potential Customers • Proximity • Combinations of customers along route • Changing circumstances • Working with the Customer • Regulations • Applicator Plan to Comply • Notice of Authorization • Inspections • Annual Training • Contract?

  6. Customer Demands • CustomerDemand Pattern • Golf course continual (with pond) • School 2-3 nights/week • Park continual, at night 2-3 nights/week • Industrial continual or irregular • Scheduling • Balance the demand over time • Less of an issue early on, critical near buildout

  7. Bruce Randolph Middle School

  8. Swansea Park

  9. City Park GC Pond

  10. Shafer Park Meter Vault

  11. Design • Treatment • Storage • Reservoirs/tanks/ponds • Location/elevation and capacity • Pump Stations • Phasing of pumps • Back-up pump • PRV connections between higher-lower pump lifts • Types of pumps • Horizontal split case, vertical turbine, booster • Pipe • Often larger since demand is concentrated in shorter duration (6 hours at night) • Tree system rather than looped • Long distances • Reliability

  12. Vertical Turbine Pumps

  13. Xcel’s Northwest Reservoir

  14. Design • Dechlorination Facility • Meters, Control Valves, Chemical Feed • Treatment Operators • Distribution Operators • Security

  15. Dechlorination Facility

  16. Dechlorination Facility

  17. Dechlorination Facility

  18. Design • Recycled Water System Standards • Purple pipe, triangular covers, signs, regulations • Reliability • Outages • Potable back-up? • Combining Meter/Valve Vaults • One or two vaults • Cost, purpose, ownership. maintenance • Access by different work groups • Meter readers, operations, customer • Security

  19. Bruce Randolph Middle SchoolMeter and Valve Vault

  20. Hydraulic Design Standards • Hydraulic Design Standards • Pressure-max, min, max fluctuation • Headloss • Velocity • Standard pipe diameters • Headloss • Long distances may mean higher pressure fluctuations or over sized pipe • Pressure Standards • 5 psi less than potable? • Higher pressure with individual pressure regulating valves? • Not Always Practical to Follow Potable Standards

  21. Design • Goal is to maximize use of the designed system thus using reduced pipe sizes. • Must manage demand to avoid peaks. • Excess capacity…until buildout. • Cannot allow on-call usage like potable. Peak demands would be concentrated in shorter time frames and result in higher headloss, fluctuations and lower pressure.

  22. Construction • Winter to meet load season • Existing development • Challenges • New development • Opportunities • Through golf courses • Restoration • Directional drilling • Avoid above ground issues, maybe…

  23. Operations • Year around or seasonal? • Start-up, Shut-down • Pumps, pipes, control valves, dechlorination • Customers with varying demands • Contract obligations (Xcel) • Flushing • Discharge • Maintaining Water Quality • Long distances

  24. Operations • Emergency Interconnects • Physical separation, insertable spool • Pond operations • Private ponds • Balance demand, additional storage • Maintain certain water levels • Inspections of Customer Systems • Periodic, Annual • Private Systems • Lack of control • Lack of urgency/sensitivity/awareness

  25. Regulations • Standards • Applicator Plan to Comply • Notice of Authorization • Approved uses • Ponding, run-off, flushing • Greater need to help the customer

  26. Changes for the Utility • Specialized design, construction, service • Integrate into existing organization? • Add specialized function/position(s)? • Marketing? • Feasibility for customer/utility • Coordination/Contact

  27. Conclusion • Recycled systems present challenges different than potable systems • Customers/Demand Patterns/Scheduling • Design • Construction • Operations • Regulations • Changes for the utility

  28. Questions?

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