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Seawater Desalination and Water Supply Reliability in Marin County

Seawater Desalination and Water Supply Reliability in Marin County. Louis Armstrong, URS Corporation. MMWD. Founded in 1912 – California’s first municipal water district Serves 185,000 residents of Central and Southern Marin County

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Seawater Desalination and Water Supply Reliability in Marin County

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  1. Seawater Desalination and Water Supply Reliabilityin Marin County Louis Armstrong, URS Corporation

  2. MMWD • Founded in 1912 – California’s first municipal water district • Serves 185,000 residents of Central and Southern Marin County • Primary supply is local reservoirs (5 on Mt. Tamalpais watershed, 2 in West Marin)

  3. Current MMWD Supplies

  4. 1987 Demand Operational Yield† Marin’s Demand for Water

  5. Yield Projected Demand Increase (120AF Per Year)

  6. Loss of 2,300AF by 2015 Utilizing North Marin PipelineProjected “Decay” of Excess Delivery Capacity

  7. Projected 2015 Scenario • Current supply deficit: 3,200AF • Demand increase: 1,560AF • Projected loss of NMWD capacity: 2,300AF • Total projected deficit: 7,060 AF

  8. Possible Solutions: Soft Path • Increased Conservation: 2,000 AF • Increased Recycling: 1,800-2,100 AF • Adjust Service Levels: 869 AF • TOTAL: 4,669 to 4,969 AF

  9. So what about Desalination…..

  10. The Process

  11. Desalination By Reverse Osmosis • 2 gallons of seawater = 1 gallon of high quality drinking water • Pre-treatment and RO removes contaminants, including mercury and other contaminants in the Bay • MMWD will use “dual pass” RO

  12. Reverse Osmosis

  13. Flow at the Membrane

  14. Effectiveness of Reverse Osmosis

  15. World-Wide Installed Capacity

  16. Advantages reliability (drought proof) independence/self-sufficiency possibly smaller environmental footprint high quality water taste test Challenges siting of plant energy consumption - improved technology, green power options, environmental management system plan discharge (CMSA) intake (Rod & Gun Club pier) sludge disposal Desalination Highlights

  17. Preferred Plant Location

  18. Option for Discharge of Brine Mix with existing WWTP outflow Considerations: • Need existing outfall with sufficient capacity • Potential to reduce dilution due to buoyancy in receiving water, or increase momentum mixing • Potential for in-pipe dilution of constituents in wastewater

  19. Next Steps... • Draft EIR released : Late Summer 2004 • Certification of the EIR : Late 2004

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