Factors influencing flux decline during nanofiltration of solutions containing dyes and salts

Ismail Koyuncu*, Dincer Topacik, Mark R. Wiesner

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

97 Citations (Scopus)

Abstract

In this paper, factors influencing the flux decline of nanofiltration membranes for the treatment of dye bath wastewaters were investigated. Experiments were performed with synthetic wastewaters. Synthetic solutions were prepared in different dye and salt concentrations at laboratory conditions. Operating conditions including cross-flow velocity and pH were changed to observe the effects of interactions between NaCl, dyes and the membrane. Cake formation rate of dye molecules on membrane surface with time was investigated by using linearized forms of cake filtration equations. The results suggest that cake layer formation of dye molecules on membrane surface, especially at low salt concentrations was the principal cause of flux decline. Operating conditions had a strong influence on permeate flux. Effects of cross-flow velocity on permeate flux were more pronounced at low NaCl concentrations. Furthermore, the lowest permeate flux values were obtained at the alkaline conditions due to increased dye hydrophobicity at high pH values.

Original languageEnglish
Pages (from-to)432-440
Number of pages9
JournalWater Research
Volume38
Issue number2
DOIs
Publication statusPublished - Jan 2004

Keywords

  • Cake formation
  • Dye bath
  • Dye/salt mixtures
  • Flux decline
  • Nanofiltration
  • Operating conditions

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