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Membrane rejection of nitrogen compounds.

S Lee1, R M Lueptow

  • 1Department of Mechanical Engineering, Northwestern University, Evanston, Illinois 60208, USA.

Environmental Science & Technology
|August 2, 2001
PubMed
Summary

Membrane rejection of nitrogen compounds depends more on electrostatic properties than molecular size. Optimizing treatment for organic nitrogen compounds may involve ammonification of urea.

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Area of Science:

  • Water treatment technologies
  • Membrane science
  • Environmental chemistry

Background:

  • Nitrogen compounds are key water pollutants.
  • Effective removal of nitrogen compounds is crucial for water quality.
  • Understanding rejection mechanisms in membrane processes is vital.

Purpose of the Study:

  • To investigate the rejection characteristics of nitrogen compounds using various membranes.
  • To elucidate the factors governing nitrogen compound rejection.
  • To assess the role of electrostatic interactions and physical properties in membrane rejection.

Main Methods:

  • Experimental examination of reverse osmosis, nanofiltration, and low-pressure reverse osmosis membranes.
  • Integration of experimental data with the extended Nernst-Planck model and steric hindrance model.
  • Analysis of solute transport mechanisms including diffusion, convection, and electromigration.

Main Results:

  • Electrostatic properties are more critical than molecular weight or structure for nitrogen compound rejection.
  • High rejection occurs when Donnan potential exceeds 0.05 V or solute-to-pore radius ratio is > 0.8.
  • Diffusion dominates solute transport, with convection significant for organic nitrogen compounds; electromigration is negligible.
  • Urea shows lower rejection than ionic nitrogen compounds, highlighting the importance of electrostatic interactions.

Conclusions:

  • Membrane rejection of nitrogen compounds is primarily governed by electrostatic interactions.
  • The study suggests ammonification of urea could enhance treatment efficiency for organic nitrogen compounds.
  • Findings provide insights for optimizing membrane-based water treatment processes for nitrogen removal.
Keywords:
NASA Discipline Life Support SystemsNon-NASA Center

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