Feasibility of the use of polymer-assisted membrane filtration for brackish water softening

Ruey Shin Juang, Chwei Huann Chiou

Research output: Contribution to journalJournal Article peer-review

42 Scopus citations


The feasibility of using polymer-assisted ultrafiltration for brackish water softening, i.e. the removal of Na+, K+, Ca2+, Mg2+, Cl-, NO3-, and SO42- from water, was studied. Three weakly basic, cationic water-soluble polymers chitosan, poly(ethylenimine), and poly(diallyl dimethylammonium chloride) were selected. The membranes Amicon YM10, YM30 (regenerated cellulose), and PM10 (polysulfone) were used. Experiments were performed as a function of solution pH. It was shown that the removal of divalent Ca2+ and Mg2+ was more efficient than that of univalent Na+ and K+. In addition, the rejection of anions decreased in the order NO3->Cl->SO42-. Finally, the fouling of membranes during filtration was analyzed by conventional cake filtration theory taking into account incompressible or compressible nature of the deposited cake.

Original languageEnglish
Pages (from-to)119-127
Number of pages9
JournalJournal of Membrane Science
Issue number1-2
StatePublished - 15 06 2001
Externally publishedYes


  • Brackish water softening
  • Chitosan
  • Fouling analysis
  • Poly(diallyl dimethylammonium chloride)
  • Poly(ethylenimine)
  • Polymer-assisted ultrafiltration


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