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

Mark Benjamin and Wei Shi

Department of Civil and Environmental Engineering,

University of Washington, Seattle, WA 98195


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


VSEP

  • Vibratory Shear Enhanced Processing

Shear

Source: New Logic Research Inc. Emeryville, CA


VSEP Applications

  • Landfill Leachate

  • Manure Management

  • Mining

  • Petroleum Processing

  • Pulp and Paper

  • Desalination


Concentrate

Feed

Feed tank

Pump

VSEPOperation

Amplitude: 13°

Frequency: 55Hz

TMP: 140 psi


ROFeedComposition

  • Brackish water*

  • Brine: 10 times as concentrated

* All units in mg/L, except for pH


Permeate Flux

Brackish

solution


Permeate Flux

Brine


Resistance Breakdown

RCP

RTOT

RF

RF

Rm

= RTOT –Rm–RCP–Rπ


Contributions to Resistance

Brackish

solution

w/ w/o vibration


inlet

outlet

S1

S2

S3

S4

w/o Vibration

w/ Vibration

Higher Shear


Painted Membrane Tests

(Jaffrinet al. 2002)

A

Shaded Area

r

Ring for permeation


Painted Membrane Tests


Painted Membrane Tests


Mechanisms to Generate Shear

Torsional Vibration

Shear- fouling

relationship

Membrane Rotation

Longitudinal Vibration

Ultrasound


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

  • 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.


outlet

inlet

10.0 cm

0.9 cm

10.24 cm

RO Membranes

*At a TMP of 2068 kPa


Solute Rejections

Brackish

solution

Brine


Solid Precipitation

  • EDAX spectrum of scales on the membrane surface


Solid Precipitation - XRD

  • XRD spectrum of precipitates in the feed solution

Aragonite

Gypsum


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