Reverse osmosis filtration for space mission wastewater: membrane properties and operating conditions

Sangho Lee, Richard M. Lueptow*

*Corresponding author for this work

Research output: Contribution to journalArticle

82 Scopus citations

Abstract

Reverse osmosis (RO) is a compact process that has potential for the removal of ionic and organic pollutants for recycling space mission wastewater. Seven candidate RO membranes were compared using a batch stirred cell to determine the membrane flux and the solute rejection for synthetic space mission wastewaters. Even though the urea molecule is larger than ions such as Na+, Cl-, and NH4+, the rejection of urea is lower. This indicates that the chemical interaction between solutes and the membrane is more important than the size exclusion effect. Low pressure reverse osmosis (LPRO) membranes appear to be most desirable because of their high permeate flux and rejection. Solute rejection is dependent on the shear rate, indicating the importance of concentration polarization. A simple transport model based on the solution-diffusion model incorporating concentration polarization is used to interpret the experimental results and predict rejection over a range of operating conditions.

Original languageEnglish (US)
Pages (from-to)77-90
Number of pages14
JournalJournal of Membrane Science
Volume182
Issue number1-2
DOIs
StatePublished - Feb 15 2001

Keywords

  • Concentration polarization
  • Rejection
  • Reverse osmosis
  • Water treatment

ASJC Scopus subject areas

  • Biochemistry
  • Materials Science(all)
  • Physical and Theoretical Chemistry
  • Filtration and Separation

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