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Reuse in Urban Landscape and Power Plants Gary Darling & Rob Parker

Reuse in Urban Landscape and Power Plants Gary Darling & Rob Parker. Re-Use = Economic Success. Gary Darling Delta Diablo Sanitation District Rob Parker Calpine Corporation GE Leadership Summit : From Used to Useful November 13, 2009 Ossining, New York.

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Reuse in Urban Landscape and Power Plants Gary Darling & Rob Parker

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  1. Reuse in Urban Landscape and Power Plants Gary Darling & Rob Parker

  2. Re-Use = Economic Success Gary Darling Delta Diablo Sanitation District Rob Parker Calpine Corporation GE Leadership Summit : From Used to Useful November 13, 2009 Ossining, New York

  3. Delta Diablo Sanitation District • Medium-Sized Plant: Average Flow 13MGD • One of the largest industrial recycled water plants in California • New recycled water service to 2 golf courses and 7city parks • May 2009 awarded the best medium-sized water treatment plant in the State of California • July 2009 recognized with Platinum Peak Performance Award - achieved by only 2% of wastewater treatment operations nation-wide San Francisco DDSD & Calpine

  4. What’s happening out West?? California Water Conditions: • 2008 statewide driest spring/summer on record • 2007 Southern California driest year on record • Sacramento and San Joaquin Rivers: • 2 year stream flow in the lowest 10% of historical range • Delta “debate” Snow Surveying in the Sierra Nevada

  5. Lake Oroville (29% capacity) Source: State of California Department of Water Resources

  6. San Luis Reservoir (16% of capacity) Source: State of California Department of Water Resources

  7. Climate Change – is it real?? • Increase in temperatures globally • Rising sea levels • [7” at Golden Gate Bridge in past 100 years] • Diminishing glaciers/snow cover • More extreme weather events • Change in precipitation patterns

  8. Untapped Resources…New paradigm for Wastewater Agencies Wastewater Treatment “waste” Recycled Water Desalination Stormwater Biosolids to Energy (Calories to E)

  9. Partnerships = Economic Success • Regional Coalitions • Bay Area Recycled Water Coalition • Bay Area Biosolids to Energy • Industry/Municipalities

  10. Calpine Corporation • Founded in 1984 • Capable of delivering nearly 25,000 megawatts in 16 states in the United States and Canada • Calpine is the nation’s largest renewable geothermal power provider • Calpine’s fleet of 62 plants makes it the largest natural gas fueled power producer in North America • Calpine currently operates 8 facilities that utilize recycled water

  11. Delta Diablo Sanitation District – Delta Energy Center Recycled Water Facility Project • 2 Calpine projects sites in the City of Pittsburg designed with wet cooling. • Average demand 7-8 MGD, Max demand 9-10 MGD. • Conventional water source(s) would be cost prohibitive, require system upgrades and difficult to permit. • DEC and DDSD adjacent to one another, LMEC 2 miles of pipeline required. • A tertiary water treatment facility (Recycled Water Facility – RWF) to meet California Title 22 specifications would be required. • The initial capital investment (Approx $20MM) for the RWF was attractive due to the two Calpine projects absorbing the cost. • Both LMEC and DEC return CT blowdown to DDSD. • Some excess capacity in RWF for future customers to reduce O&M costs.

  12. Recycled Water Use Challenges • In California, the Title 22 specifications are limited. No limits on TDS, ammonia, bio-loading, phosphate etc. • High ammonia levels provide operational challenges and higher chemical costs. • High TDS influences the amount of cooling tower cycles that can be achieved. Driven by air permit, leads to higher chemical costs. Wet Cooling vs. Dry Cooling • Available water resources • Plant footprint considerations • Air cooled presents higher initial capital costs • Air cooled can have negative impact on plant performance (3%- 7%) • Wet cooled will have higher operating costs (Chemical treatment) • Wet cooled may have discharge challenges (NPDES Permit, ZLD?) • Plume issues?

  13. Case Study:Antioch Recycled Water Project[1 golf course, 4 city parks] Construction costs of $10 million

  14. Comparison of Recycled Water -v- Fresh Water Costs -Must be done on an “apples to apples” basis: • Recycled water is STILL more cost effective when treatment facility capital costs are added • Recycled water is “drought proof” • There are no fisheries impacts from use of recycled water

  15. Key Messages: • Fresh water supply is in crisis and costs will rise • Recycled water is a major part of the solution • Public/private partnerships promote economic viability • Federal and State funding further enhance economics

  16. Gary W. Darling General Manager Delta Diablo Sanitation District 925-756-1900 garyd@ddsd.org Rob Parker Director of Asset Management (Western Region) Calpine Corporation 925-557 2259 rparker@calpine.com

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