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Potable Reuse in Texas: A Glimpse into the New Water Frontier

Potable Reuse in Texas: A Glimpse into the New Water Frontier. Ellen McDonald, Ph.D., P.E. Alan Plummer Associates, Inc. Acknowledgments. City of Brownwood David Harris, Director of Utilities City of Wichita Falls Daniel Nix, Operations Manager El Paso Water Utilities

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Potable Reuse in Texas: A Glimpse into the New Water Frontier

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  1. Potable Reuse in Texas: A Glimpse into the New Water Frontier Ellen McDonald, Ph.D., P.E. Alan Plummer Associates, Inc.

  2. Acknowledgments • City of Brownwood • David Harris, Director of Utilities • City of Wichita Falls • Daniel Nix, Operations Manager • El Paso Water Utilities • Irazema Rojas, Environmental Compliance Manager • ARCADIS • Freese and Nichols

  3. Evolution of Reuse in Texas Direct Potable Planned Indirect Potable Unplanned Municipal Industrial Agricultural

  4. DPR in the Barton Springs Zone?

  5. Major Texas Potable Reuse Projects • Trinity River Basin projects • El Paso • Colorado River Municipal Water District

  6. Evolution of Potable Reuse WWTP WTP ? Environmental Buffer

  7. CRMWD at Big Spring Project

  8. Other DPR Projects In Process Stay tuned… there are more on the way! Wichita Falls EL Paso

  9. Wichita Falls Emergency DPR Project • Use existing MF/RO facility to treat effluent from WWTP • RO permeate to be blended 50/50 with raw water from lakes • Blended water to be treated at conventional WTP • Pipeline from WWTP to WTP laid above ground Source: www.timesrecordnews.com/photos/galleries/2014/feb/04/inside-look-water-reuse-project/12132/#section_headery's

  10. City of Brownwood Conservation pool: 1424.6 ft

  11. City of Brownwood – Proposed System (1.5 MGD) • Estimated Cost - $8.5 Million • Project Status: • TWDB funding approved Sept. 2012 • TCEQ construction approval Dec. 2012 • No blending required • Requires full-scale verification • Awaiting council approval to move forward

  12. El Paso Water Utilities Elephant Butte Reservoir 18.4% Full as of April 22, 2014 • Existing Supplies • Rio Grande • Groundwater • Hueco Bolson Aquifer • Mesilla Bolson Aquifer • Reclaimed water • Nonpotable reuse • Groundwater recharge

  13. Advanced Purified WTP Concept MF Backwash to RBWWTP Headworks = 1 MGD Roberto R. Bustamante WWTP with Additional Treatment Advanced Purified WTP Distribution System Reclaimed Water 10 MGD 7.2 MGD Reclaimed Water Customers Rio Bosque Wetland Park Brine disposal: Blend w/WWTP effluent = 1.8 MGD Outfall Riverside Irrigation Canal

  14. Advanced Treatment for DPR Concentrate Disposal WWTP WTP “Engineered Storage” and Monitoring

  15. The 4 “R’s” of Treatment for DPR Redundancy f(# of barriers targeting a contaminant) RELIABILITY Robustness f(treatment process diversity) Resilience f(failure response protocols)

  16. The bandwagon is tempting… Proceed Carefully! Direct Potable Reuse the solution to your water supply woes

  17. Questions to ask before jumping on the bandwagon • What are relevant regulations? • What are appropriate water quality performance targets? • What treatment schemes can be used? • What monitoring is needed?

  18. Questions to ask before jumping on the bandwagon • What operations skills are needed? • How much will the project cost? • Are there other options? • Will the public support the project?

  19. Texas Water Development Board DPR Research Initiatives • “Evaluating the Potential for Direct Potable Reuse in Texas” • Develop resource document for DPR implementation • “Testing Water Quality in a Municipal Wastewater Effluent Treated to Drinking Water Standards” • Testing at CRMWD DPR facility • Develop monitoring guidelines for DPR

  20. National DPR Research Focus Areas • Alternative treatment schemes • Blending and storage needs • Treatment operations and reliability • Monitoring strategies • Quality assurance • Public education and communication

  21. Ellen McDonald, Ph.D., P.E. 817-806-1700 emcdonald@apaienv.com

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