Contributions to permeation resistance in a vsep ro system treating brackish water or brine
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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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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

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


Contributions to permeation resistance in a vsep ro system treating brackish water or brine

VSEP

  • Vibratory Shear Enhanced Processing

Shear

Source: New Logic Research Inc. Emeryville, CA


Vsep applications

VSEP Applications

  • Landfill Leachate

  • Manure Management

  • Mining

  • Petroleum Processing

  • Pulp and Paper

  • Desalination


Vsep operation

Concentrate

Feed

Feed tank

Pump

VSEPOperation

Amplitude: 13°

Frequency: 55Hz

TMP: 140 psi


Ro feed composition

ROFeedComposition

  • Brackish water*

  • Brine: 10 times as concentrated

* All units in mg/L, except for pH


Permeate flux

Permeate Flux

Brackish

solution


Permeate flux1

Permeate Flux

Brine


Resistance breakdown

Resistance Breakdown

RCP

RTOT

RF

RF

Rm

= RTOT –Rm–RCP–Rπ


Contributions to resistance

Contributions to Resistance

Brackish

solution

w/ w/o vibration


Contributions to permeation resistance in a vsep ro system treating brackish water or brine

inlet

outlet

S1

S2

S3

S4

w/o Vibration

w/ Vibration

Higher Shear


Painted membrane tests

Painted Membrane Tests

(Jaffrinet al. 2002)

A

Shaded Area

r

Ring for permeation


Painted membrane tests1

Painted Membrane Tests


Painted membrane tests2

Painted Membrane Tests


Mechanisms to generate shear

Mechanisms to Generate Shear

Torsional Vibration

Shear- fouling

relationship

Membrane Rotation

Longitudinal Vibration

Ultrasound


Conclusions

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


Acknowledgements

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.


Ro membranes

outlet

inlet

10.0 cm

0.9 cm

10.24 cm

RO Membranes

*At a TMP of 2068 kPa


Solute rejections

Solute Rejections

Brackish

solution

Brine


Solid precipitation

Solid Precipitation

  • EDAX spectrum of scales on the membrane surface


Solid precipitation xrd

Solid Precipitation - XRD

  • XRD spectrum of precipitates in the feed solution

Aragonite

Gypsum


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