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Related Experiment Videos

Concentration Polarization of Interacting Solute Particles in Cross-Flow Membrane Filtration.

Bhattacharjee1, Kim, Elimelech

  • 1Department of Chemical Engineering, Yale University, 9 Hillhouse Avenue, New Haven, Connecticut, 06520-8286

Journal of Colloid and Interface Science
|March 11, 1999
PubMed
Summary

This study presents a theoretical model to predict how particle interactions affect membrane filtration. It quanties the impact of solute-solute forces on concentration polarization and permeate flux decline in charged particle dispersions.

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Area of Science:

  • Chemical Engineering
  • Physical Chemistry
  • Materials Science

Background:

  • Concentration polarization and permeate flux decline are critical issues in cross-flow membrane filtration.
  • Understanding interparticle interactions is essential for accurate modeling of charged solute behavior in dispersions.
  • Existing models often simplify or neglect the complex effects of solute-solute forces.

Purpose of the Study:

  • To develop a theoretical approach for predicting the influence of interparticle interactions on concentration polarization.
  • To quantitatively incorporate solute-solute interactions into a standard concentration polarization model.
  • To investigate the effects of ionic strength and electrostatic potential on solute properties and filtration performance.

Main Methods:

Related Experiment Videos

  • Solving the Ornstein-Zernike integral equation with hard-spherical and long-range closures to determine the radial distribution function.
  • Calculating osmotic pressure and diffusion coefficient based on the radial distribution function.
  • Incorporating concentration-dependent osmotic pressure and diffusion into a convective-diffusion model for permeate flux prediction.

    • Main Results:

    • The model successfully predicts the radial distribution function, osmotic pressure, and diffusion coefficient of charged solute particles.
    • It quantifies the concentration dependence of these properties due to interparticle interactions.
    • The study demonstrates the combined influence of solute diffusivity and osmotic pressure on permeate flux decline.

    Conclusions:

    • The developed theoretical approach provides a direct and quantitative method to include interparticle interactions in concentration polarization theory.
    • This model enhances the understanding and prediction of permeate flux decline in charged particle filtration.
    • The findings are crucial for optimizing membrane filtration processes involving charged colloidal systems.