Operation of SAWS New Groundwater Desal Plant - Richard Donat
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TWCA 2017 Annual Conference
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Operation of SAWS New Groundwater Desal Plant - Richard Donat
- 1. TWCA Richard Donat Executive Management Analyst, Engineering and Construction San Antonio Water System Brackish Groundwater Desalination Project March 1, 2017
- 2. March 1, 2017 SAWS Brackish Groundwater Desalination Project Page 2 Outline • Water Challenges • Project Background • Project Challenges • Facility Highlights
- 3. March 1, 2017 SAWS Brackish Groundwater Desalination Project Page 3 Water Supply Challenges
- 4. March 1, 2017 SAWS Brackish Groundwater Desalination Project Page 4 Why Brackish Inland Desalination • Large volumes of available brackish water • Resource close to San Antonio • Identified in the SAWS 2005 Water Management Plan • Diversification • Untapped resource
- 5. March 1, 2017 SAWS Brackish Groundwater Desalination Project Page 5 Desalination Program • Phase I (2016) – 12 MGD – 13,440 Acre-feet / year – (~53,000 Households) • Source Water – Lower Wilcox Formation – 12 Production wells (~1,500’ avg. depth) • Treatment Process – Reverse Osmosis • Concentrate Disposal – 2 Injection wells (5,000’ avg. depth) General Information
- 6. March 1, 2017 SAWS Brackish Groundwater Desalination Project Page 6 Project Cost • Project Cost: $192.7 million, $1,177 $/AF • Began producing water November 9, 2016 Phase I
- 7. March 1, 2017 SAWS Brackish Groundwater Desalination Project Page 7 Challenges • State and Local Groundwater Regulation • Public Perception • Stakeholder Buy in • Funding/Value Engineering • Real Estate • Concentrate Disposal • Design • Construction • Operational
- 8. March 1, 2017 SAWS Brackish Groundwater Desalination Project Page 8 Concentrate Disposal Options Considered
- 9. March 1, 2017 SAWS Brackish Groundwater Desalination Project Page 9 Design • Prevent Membrane fouling – Open System vs. Closed System – Pre-treatment • Finish water quality standards • Short design timeline – Multiple sub-consultants Challenges
- 10. March 1, 2017 SAWS Brackish Groundwater Desalination Project Page 10 Construction Challenges • Budget – Managing a budget without owner contingency • Schedule – Record Rainfall (2 yrs.) • Complicated Construction – 13 Work Packages Challenges
- 11. March 1, 2017 SAWS Brackish Groundwater Desalination Project Page 11 Operational • Learning curve – Fully automated plant – Bring in operators early – 1 month RDT & 3 months commissioning phase • Operational – Raw Water • Cartridge Filters/Turbidity – Fouling – Meeting Finished Water Goals Challenges
- 12. March 1, 2017 SAWS Brackish Groundwater Desalination Project Page 12 Stage 1 Stage 2 Reverse Osmosis Primary Trains Stage 1 Stage 2 Stage 1 Stage 2 Stage 1 Stage 2 Lower Wilcox Wellfield Pre-Filters 13.11 mgd 2 mgd Anti- Scalant Reverse Osmosis Concentrator Trains Stage 3 Stage 3 8.88 mgd 1.11 mgd Injection Wells 12 mgd 1.11 mgd H2SO4 Calcite Contactors 30% 70% CO2 Degasifiers NaOH Cl2 Process Diagram Operational
- 13. March 1, 2017 SAWS Brackish Groundwater Desalination Project Page 13 Construction 2014 to Present Building Success June 2014 April 2015 December 2016February 2016
- 14. March 1, 2017 SAWS Brackish Groundwater Desalination Project Page 14 Treatment Facility
- 15. March 1, 2017 SAWS Brackish Groundwater Desalination Project Page 15 Three Water Supplies at H2Oaks
- 16. March 1, 2017 SAWS Brackish Groundwater Desalination Project Page 16 Water Supply and Educational Center Education and Outreach
- 17. March 1, 2017 SAWS Brackish Groundwater Desalination Project Page 17 Water Supply and Educational Center Education and Outreach
- 18. March 1, 2017 SAWS Brackish Groundwater Desalination Project Page 18 Grand Opening Festivities January 27, 2017
- 19. March 1, 2017 SAWS Brackish Groundwater Desalination Project Page 19 Thank you
- 20. TWCA Richard Donat Executive Management Analyst, Engineering and Construction San Antonio Water System Brackish Groundwater Desalination Project March 1, 2017
- 21. March 1, 2017 SAWS Brackish Groundwater Desalination Project Page 21 Regulatory • State and Local Groundwater Regulation – 16 Groundwater Management Areas – 100 Groundwater Districts • Challenges: – Desired Future Conditions (DFCs) – Groundwater Permits Challenges http://www.tceq.state.tx.us/assets/public/permitting/watersupply/groundwater/maps/gcdmap.pdf
- 22. March 1, 2017 SAWS Brackish Groundwater Desalination Project Page 22 Stakeholder Buy in • Large project many different stakeholders across SAWS • Partnering sessions with SAWS upper management • Desal plant visits across the United States • Outreach to San Antonio elected officials and SAWS Board of Trustees – Addressed Project concerns • Construction Manager, Program Manager, and SAWS Workshops Challenges
- 23. March 1, 2017 SAWS Brackish Groundwater Desalination Project Page 23 Budgeting Developing Cost Estimates *For comparison purposes all estimates assume 5% annual debt service *2009/2010 Estimate 10 MGD / 2012 Estimate 10.9 MGD / 2014 Estimate 12 MGD • Economy • Increase Plant Capacity • Scope/Vision Change • New Information • Estimates vs. Actual Bids
- 24. March 1, 2017 SAWS Brackish Groundwater Desalination Project Page 24 Funding • Rate approval through SAWS board of Trustees and City Council • Texas Water Development Board (TWDB) Low Interest Loans • Construction estimates greater than budget estimates – Value Engineering – $17.7M reduction Funding Sources for the Program Interest Rate $/acre- foot $/1,000 gallons 5% $1,370 $4.20 4% $1,266 $3.89 3% $1,177 $3.60 *Without and interest rate reduction SAWS would need to lower the capital cost by $40M to achieve $1,177 / acre-foot
- 25. March 1, 2017 SAWS Brackish Groundwater Desalination Project Page 25 Real Estate • Purchasing land needed for well field – 3,200 acres already owned – Additional 2,800 acres purchased – Takes time • Land is leased back for agriculture and grazing – Livestock • Working with neighbors – Public Meeting Challenges
Editor's Notes
- Unique Water Environment of San Antonio – Difficult to plan for Creation of the EAA in 1996 Moving from an unregulated water supply to a regulated resource in order to protect endangered species located at Comal and San Marcos Springs San Antonio would not have the necessary amount of permitted water to meet the needs of its customer both short term and long term. SAWS had to move fast to identify and construct water supply projects Extreme weather conditions Conditions change from year to tear as well as within the year Heavily impacts certain water supplies, the Edwards Aquifer up to 44% in a year San Antonio could go from more than enough water to being short by over 80,000 af
- Annual Estimated Debt Service (~3% over 30 years): $9.9M Annual Estimated O&M: $5.9M
- Options Discharge into stream Treatment of disposal water Injection well – based on feasibility studies and tests there does not appear to be any issue Evaporation ponds Land application Farmed shrimp
- Design – 2012 - 2014
- 1 month of SAWS operators shadowing the consultants operators 3 months of SAWS operating the plant with consultants on hand to help address any issues
- Desired Future Conditions approved through by GMA 13 Region L Plan – required projects need to be part of Region L plan to get state funding. Ensured the full volume of our projects are submitted within the model – 2016 Region L plan – New = 48’ drawdown and Currently 5622 MAG for brackish – Projects need to be in Region L to get state funding –
- Outreach occurred with SAWS board of Trustees and City Council members addressing concern on the project Consent decree came in 2013 and there was an expected sewer infrastructure increase in cost to $1.1B WIF Funding ($109.5M) – Fill out application and provide backup information including contracts, deeds, feasibility studies, drawings
- Purchasing land in rural Texas can be challenging. Incomplete deeds, surveys, mineral rights. Neighbors story of the drill rig and the wedding Story of Larry and his concern seeing us out there Story of window being shot out