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Contributions to Permeation Resistance in a VSEP RO System Treating Brackish Water or Brine

Contributions to Permeation Resistance in a VSEP RO System Treating Brackish Water or Brine. Mark Benjamin and Wei Shi Department of Civil and Environmental Engineering, University of Washington, Seattle, WA 98195. Reverse Osmosis (RO).

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Contributions to Permeation Resistance in a VSEP RO System Treating Brackish Water or Brine

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  1. Contributions to Permeation Resistance in a VSEP RO System Treating Brackish Water or Brine Mark Benjamin and Wei Shi Department of Civil and Environmental Engineering, University of Washington, Seattle, WA 98195

  2. Reverse Osmosis (RO) • Reverse Osmosis (RO): Increasingly used in treatment of brackish water and brine for potable water • Fouling: Production Pressure Time Time Constant Pressure Constant Production

  3. VSEP • Vibratory Shear Enhanced Processing Shear Source: New Logic Research Inc. Emeryville, CA

  4. VSEP Applications • Landfill Leachate • Manure Management • Mining • Petroleum Processing • Pulp and Paper • Desalination

  5. Concentrate Feed Feed tank Pump VSEPOperation Amplitude: 13° Frequency: 55Hz TMP: 140 psi

  6. ROFeedComposition • Brackish water* • Brine: 10 times as concentrated * All units in mg/L, except for pH

  7. Permeate Flux Brackish solution

  8. Permeate Flux Brine

  9. Resistance Breakdown Rπ RCP RTOT RF RF Rm = RTOT –Rm–RCP–Rπ

  10. Contributions to Resistance Brackish solution w/ w/o vibration

  11. inlet outlet S1 S2 S3 S4 w/o Vibration w/ Vibration Higher Shear

  12. Painted Membrane Tests (Jaffrinet al. 2002) A Shaded Area r Ring for permeation

  13. Painted Membrane Tests

  14. Painted Membrane Tests

  15. Mechanisms to Generate Shear Torsional Vibration Shear- fouling relationship Membrane Rotation Longitudinal Vibration Ultrasound

  16. Conclusions • Membrane vibration • Increases permeate flux • Reduces the contribution of fouling to the total resistance • Changes scale morphology into more porous structures • Shear Rate • Governs fouling of RO membranes • Facilitate the design of similar systems for fouling prevention/reduction

  17. Acknowledgements • This work was supported by the Water Research Foundation (WRF) *. • The authors thank New Logic Research, Inc., for providing the test unit. • Yujung Chang and Pierre Kwan of HDR, Inc., and Sommer Carter of NLR provided valuable technical assistance during the project. *The views expressed are those of the authors and do not necessarily reflect those of WRF.

  18. outlet inlet 10.0 cm 0.9 cm 10.24 cm RO Membranes *At a TMP of 2068 kPa

  19. Solute Rejections Brackish solution Brine

  20. Solid Precipitation • EDAX spectrum of scales on the membrane surface

  21. Solid Precipitation - XRD • XRD spectrum of precipitates in the feed solution Aragonite Gypsum

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