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Related Experiment Videos

Steady-state sieving across membranes.

E H Bresler, R P Wendt, E A Mason

    Science (New York, N.Y.)
    |May 21, 1971
    PubMed
    Summary
    This summary is machine-generated.

    Steady-state membrane sieving requires both removal and rejection mechanisms. A series membrane model shows the first membrane

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    Area of Science:

    • Membrane science and technology
    • Chemical engineering
    • Separation processes

    Background:

    • Steady-state operation is a common constraint in membrane filtration processes like sieving and ultrafiltration.
    • Theoretical models for effective sieving under steady-state conditions are limited.
    • Understanding these mechanisms is crucial for optimizing membrane performance.

    Purpose of the Study:

    • To explore theoretical mechanisms for sieving and ultrafiltration under steady-state conditions.
    • To illustrate the requirements for effective sieving in a steady state.
    • To analyze the influence of membrane array structure on overall sieving characteristics.

    Main Methods:

    • Development of a theoretical model using membranes arranged in a series array with intervening compartments.

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  • Analysis of the model without complex mathematical derivations.
  • Examination of the interplay between removal and rejection mechanisms.

    • Main Results:

    • Steady-state sieving necessitates the simultaneous presence of both a removal and a rejection mechanism.
    • A model of series membranes demonstrates these principles effectively.
    • In specific operational regimes, the first membrane's structure dictates the entire array's sieving behavior.

    Conclusions:

    • The constraint of steady-state operation significantly limits theoretical sieving mechanisms.
    • Effective steady-state sieving requires a dual mechanism: removal and rejection.
    • Membrane array design, particularly the initial membrane, plays a critical role in determining filtration outcomes.