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Buckhorn Disinfection Byproducts / Backwash Disposal Project

Buckhorn Disinfection Byproducts / Backwash Disposal Project. Board of Directors Meeting June 14, 2012. Presentation Outline. Project Purpose and Issues Backwash Management Strategies DBP Reduction Alts and Recommendations Recommended Phasing Plan. Project Purpose and Issues.

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Buckhorn Disinfection Byproducts / Backwash Disposal Project

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  1. Buckhorn Disinfection Byproducts / Backwash Disposal Project Board of Directors MeetingJune 14, 2012

  2. Presentation Outline Project Purpose and Issues Backwash Management Strategies DBP Reduction Alts and Recommendations Recommended Phasing Plan

  3. Project Purpose and Issues • Project Purpose: • Assure Compliance with Stage 2 Disinfection Byproduct (DBP) Rule (a)& Develop An Integrated Backwash Management Strategy • Key Project Issues: • Elevated DBPs in the Buckhorn WTP Distribution System • Insufficient Pond 7 Storage Capacity for Backwash Waste Water Disposal (a) Effective October 1, 2013.

  4. Backwash Water Management Strategies for the Buckhorn WTP • Expand Pond 7 to Contain 100-Yr Storm Event per WDR • Remove Solids at WTP to allow Recycle to WTP and/or Discharge Treated Backwash Water (BWW) to Pond 7 • No WDR Required • Select Best Long-Term and Most Cost Effective Backwash WaterManagement Strategy

  5. Comparison of Solids Removal Alternatives

  6. Proposed Flow Schematic

  7. Potential Site Layout Recommended DeskinsTM System (Solids Removal and Dewatering)

  8. Stage 2 DBR Rule ComplianceHistorical TTHM/HAA5 Results

  9. DBP Removal Strategies • TOC Removal • Coagulation/Filtration • Adsorption • Oxidation • Reduce Chlorine Dose • Maintain Disinfection CT • Maintain Residual Disinfectant throughout System • Distribution System Modifications • Reduce Water Age • Tank Materials

  10. Buckhorn WTP Distribution System DBP Sample Location

  11. Comparison of DBP Reduction Alternatives

  12. ACH DBP Reduction

  13. Recommended Phasing Plan Goal: ACH feed system operational Summer 2013; highest DBP concentrations have historically occurred during summer seasona a First set of Stage 2 DBP compliance testing to be conducted prior to October 1, 2013 b Testing conducted by Agency operators and staff

  14. Questions ?

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