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Visit us at: ci.englewood.co\wwtp\default.htm

Visit us at: www.ci.englewood.co.uswwtpdefault.htm. K. I. S. S. K Chemical I njection S ystem S implified. Presented by. Kirk Petrik - Project Manager, Brown and Caldwell Darwin Barrie - Maintenance Supervisor, Littleton / Englewood WWTP

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Visit us at: ci.englewood.co\wwtp\default.htm

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  1. Visit us at: www.ci.englewood.co.us\wwtp\default.htm

  2. K. I. S. S. KChemical Injection System Simplified

  3. Presented by • Kirk Petrik - Project Manager, Brown and Caldwell • Darwin Barrie - Maintenance Supervisor, Littleton / Englewood WWTP • Greg Farmer - Operations Supervisor, Littleton / Englewood WWTP • James Widner - Brown and Caldwell

  4. History • 1991- Liquid chemical disinfection system replaced gas system • Cost - $466,000 • Complexity increased through design • Temporary system - designed to last 5 years

  5. L / E WWTP Action Team Research • Records • Operations log entries • Maintenance work orders • www.wef.org • Discussion forums • Meetings • Staff interviews • Brainstorming • Develop action plan

  6. Chemical Supplier Experience • Tank penetrations / Rigid connections • Minimal below liquid level • Connections / valves / fittings • Each connection a leak source • System replacement • Tank selection critical • Every 5 years • Off gassing • 50% decomposition to gas every 100 days @ 21C

  7. Original Liquid System Manifold & Fixed Pump Concept • Chemical isolated in valves and piping • Repairs require additional piping, fittings • Specialized electronic repair on-site

  8. Leakage Result of NaOCl isolation in piping- chemical decomposition

  9. Specialized electronic repair

  10. Complex Piping How many valves can you count?

  11. Complex Control System

  12. L/E WWTP System Concept • Keep it Simple • One Tank + One Pump = One System • Easily isolated • Remove and replace pump- no tools required • Minimal piping and valves • Flexibility/Versatility

  13. L/E WWTP System Overview Containmentareas

  14. Simplified Layout

  15. Simplified Piping

  16. Simplified Control Speed indicator / totalizer 110 V outlet Sodium bisulfite pumps

  17. Simplified Pump Controls Hand - Off - Auto Switch 110 V connection 4 - 20 mA input Manual speed control dial Plug and Play

  18. Temporary System

  19. Chemical Transfer / Emergency Response Containment drain valve Transfer pump connection Transfer pump

  20. Off - Gassing Chlorine gas trapped in line Pressure relieved

  21. Pumps & Piping Before After

  22. After Pumps Before

  23. Pump Controls Before After

  24. System Operation & Control

  25. 1 2 Pump Maintenance Change pump tube as indicated by totalizer: Hypochlorite -every 2 months Bisulfite -every 3 weeks 3 4

  26. Dosage Control Methods • Wet chemistry residual analyzer • Unreliable • Hach DPD method • Interference • Oxidation Reduction Potential

  27. OxidationReductionPotential • ORP measures the transfer of electrons • Chlorine forms that are toxic to microorganisms are missing one or more electrons and satisfy their need for electrons by stealing them from organics or other donors through an electrical attraction. • This electrical potential is the ORP and is measurable in millivolts (mV) • Higher mV = greater disinfecting capability

  28. ORP Probe Locations ORP Controller Effluent ORP Influent ORP

  29. ORP Controller & Probe Influent ORP Effluent ORP Programming access

  30. ChlorinationSetpoint • Select a setpoint that gives the desired fecal kill • The setpoint is dependant on the chlorine residual species

  31. DechlorinationSetpoint • Start with a low setpoint to assure compliance • Gradually increase setpoint if chemical savings is desired

  32. ORP Maintenance • Autowash cycle once/day • A weak acid solution is pumped to the electrode • A calculated average dosage is maintained while in the wash cycle • Manual cleaning twice/week • Pull the probe and clean with a toothbrush

  33. Manual Probe Cleaning Acid cleaning solution Auto wash reservoir Toothbrush

  34. ORP Performance Fecal Coliform 3330 /100ml* Since ORP Installation - 300 / 100 ml Effluent Chlorine Residual 0.003 mg/l Since ORP Installation - 0 Violations * 30 day geometric mean

  35. Alternate Control Modes • Flow paced mode • The pump speed is paced by the flow meter • Manual mode • The Pump speed is manually adjusted to maintain the desired ORP mV

  36. ORP / Flow Paced Control Choose flow paced or ORP paced pump speed

  37. Operational Summary • More is not always better • Simplicity in design = Simplicity in operation and maintenance • Simplicity can increase versatility • Chlorination / dechlorination automation can provide reliability

  38. Disinfection Alternative Costs

  39. The End

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