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

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) Treating Brackish Water or Brine

  • 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 Treating Brackish Water or Brine

  • Vibratory Shear Enhanced Processing

Shear

Source: New Logic Research Inc. Emeryville, CA


Vsep applications
VSEP Applications Treating Brackish Water or Brine

  • Landfill Leachate

  • Manure Management

  • Mining

  • Petroleum Processing

  • Pulp and Paper

  • Desalination


Vsep operation

Concentrate Treating Brackish Water or Brine

Feed

Feed tank

Pump

VSEPOperation

Amplitude: 13°

Frequency: 55Hz

TMP: 140 psi


Ro feed composition
RO Treating Brackish Water or BrineFeedComposition

  • Brackish water*

  • Brine: 10 times as concentrated

* All units in mg/L, except for pH


Permeate flux
Permeate Flux Treating Brackish Water or Brine

Brackish

solution


Permeate flux1
Permeate Flux Treating Brackish Water or Brine

Brine


Resistance breakdown
Resistance Breakdown Treating Brackish Water or Brine

RCP

RTOT

RF

RF

Rm

= RTOT –Rm–RCP–Rπ


Contributions to resistance
Contributions to Resistance Treating Brackish Water or Brine

Brackish

solution

w/ w/o vibration


inlet Treating Brackish Water or Brine

outlet

S1

S2

S3

S4

w/o Vibration

w/ Vibration

Higher Shear


Painted membrane tests
Painted Membrane Tests Treating Brackish Water or Brine

(Jaffrinet al. 2002)

A

Shaded Area

r

Ring for permeation


Painted membrane tests1
Painted Membrane Tests Treating Brackish Water or Brine


Painted membrane tests2
Painted Membrane Tests Treating Brackish Water or Brine


Mechanisms to generate shear
Mechanisms to Generate Shear Treating Brackish Water or Brine

Torsional Vibration

Shear- fouling

relationship

Membrane Rotation

Longitudinal Vibration

Ultrasound


Conclusions
Conclusions Treating Brackish Water or Brine

  • 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 Treating Brackish Water or Brine

  • 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 Treating Brackish Water or Brine

inlet

10.0 cm

0.9 cm

10.24 cm

RO Membranes

*At a TMP of 2068 kPa


Solute rejections
Solute Rejections Treating Brackish Water or Brine

Brackish

solution

Brine


Solid precipitation
Solid Precipitation Treating Brackish Water or Brine

  • EDAX spectrum of scales on the membrane surface


Solid precipitation xrd
Solid Precipitation - XRD Treating Brackish Water or Brine

  • XRD spectrum of precipitates in the feed solution

Aragonite

Gypsum


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