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Membrane and solution effects on solute rejection and productivity.

A K Zander1, N K Curry

  • 1Department of Civil and Environmental Engineering, Clarkson University, Potsdam, NY 13699, USA. zander@clarkson.edu

Water Research
|January 5, 2002
PubMed
Summary

Divalent cations significantly reduce water purification efficiency and membrane lifespan in nanofiltration. Lowering ionic strength improves contaminant removal but accelerates membrane fouling, impacting drinking water treatment.

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Area of Science:

  • Environmental Science
  • Chemical Engineering
  • Water Treatment Technologies

Background:

  • Widespread application of membrane processes for drinking water treatment is hindered by a lack of understanding of underlying physical and chemical mechanisms.
  • Nanofiltration (NF) membranes are crucial for water purification, but their performance is sensitive to solution chemistry and membrane surface properties.

Purpose of the Study:

  • To investigate the impact of solution chemistry (pH, ionic strength, cation valence) on the performance of loose nanofiltration membranes.
  • To elucidate the relationship between membrane surface characteristics and fouling behavior under varying conditions.

Main Methods:

  • Systematic manipulation of solution chemistry with eighteen defined solutions, including variations in pH, ionic strength, and cation valence (monovalent vs. divalent).

Related Experiment Videos

  • Filtration experiments using three distinct loose nanofiltration membranes: non-ionic hydrophobic, non-ionic hydrophilic, and anionic hydrophilic.
  • Monitoring of membrane productivity, total organic carbon (TOC) rejection, and conductivity rejection.

    • Main Results:

    • Divalent cations significantly decreased both conductivity and TOC rejection compared to monovalent cations.
    • Divalent cations markedly accelerated the rate of membrane productivity decline.
    • The most hydrophobic membrane exhibited the highest productivity decline rate across all tested conditions.
    • Lowest ionic strength solutions achieved the highest TOC and conductivity rejection but also experienced the most rapid productivity decline.

    Conclusions:

    • Solution chemistry, particularly cation valence and ionic strength, critically influences nanofiltration performance and fouling.
    • Membrane surface properties, specifically hydrophobicity, play a significant role in the fouling process.
    • Optimizing nanofiltration for drinking water treatment requires balancing contaminant removal with membrane stability and longevity.