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Water Quality Integration Study

Water Quality Integration Study. Justin Pickard West Basin Municipal Water District 2 nd Annual CalDesal Conference October 4 th , 2013. Outline. Introduction to West Basin West Basin’s Desalination History Project Objectives Part 1 - Pipe Loop Testing

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Water Quality Integration Study

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  1. Water Quality Integration Study Justin Pickard West Basin Municipal Water District 2nd Annual CalDesal Conference October 4th, 2013

  2. Outline • Introduction to West Basin • West Basin’s Desalination History • Project Objectives • Part 1 - Pipe Loop Testing • Part 2 - Chloramine Stability and DBP Formation

  3. Who is West Basin? • Wholesaler of imported water • MWD of So Cal Member Agency • Industry leader in water recycling • 1 million people in service area • 17 cities and portions of • unincorporated LA County

  4. Conservation Recycled Water Groundwater Groundwater Groundwater 1947 1990 2012 Imported Water Imported Water West Basin Water Supply Portfolio

  5. Desalinated Ocean Water Groundwater Conservation 2020 Recycled Water Imported Water West Basin Water Supply Portfolio

  6. West Basin’s Desalination History

  7. Desalination Objectives and Steps • Improve reliability • Reduce dependence on imported water • Diversify water supply portfolio • New source of local potable water

  8. Water Quality Integration Study Project Objectives • Part 1: Evaluate the impacts of introducing desalinated water into local distribution systems • Part 2: Evaluate the impacts of desalinated water on chloramine stability and the potential for disinfectant byproduct (DBP) formation in partnership with MWD

  9. Part 1 – Pipe Loop Testing • Circulate blends of desal water, groundwater and MWD water through typical distribution system materials • Test water for metals which indicate corrosion • Determine post treatment processes for full scale facility

  10. Part 1 – Pipe Loop Testing • 5 Blends of Water: • 100% Desal • 100% MWD • 50% Desal/50% MWD • 25% Desal/75% Groundwater • 25% MWD/75% Groundwater • Duplicate Loop (100% MWD)

  11. Desal Stabilization

  12. Source Water Quality

  13. Stabilization Indexes

  14. Copper Pipe Loops • Typical home plumbing materials • Copper pipe with lead solder • Harvested brass water meters • Alternating stagnation/ circulation cycle • Constituents of interest: Copper, Lead

  15. Copper Pipe Loops - Copper

  16. Copper Pipe Loops - Lead

  17. Brass Meters - Copper

  18. Brass Meters - Lead

  19. Cement Mortar Lined Steel Pipe • Typical distribution system material • Steel pipe with cement mortar lining • Constant circulation for 7 days • Constituents of interest: Aluminum

  20. CML Pipe Loops - Aluminum

  21. Unlined Cast Iron Pipe • Typical material in older distribution systems • Harvested from local distribution system • Constant circulation for 7 days • Constituents of interest: Iron, Manganese

  22. Unlined Cast Iron Pipe - Iron

  23. Unlined Cast Iron Pipe - Mn

  24. Part 1 – Pipe Loop Testing Conclusions • All source waters had positive CCPP and LSI values • Calcite contactor was effective post treatment for desalwater • Problematic leaching of metals not observed for 100% desal water or desal blends

  25. Part 2 – Chloramine Stability and DBP Formation • Bromide in desal water can impact chloramine stability • Chlorine can react with bromide and organic material to form disinfectant byproducts • MWD to investigate in bench-scale testing

  26. Acknowledgements • Metropolitan Water District of Southern California

  27. Water Quality Integration Study Thanks!

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