Reactive dye removal in dye/salt mixtures by nanofiltration membranes containing vinylsulphone dyes: Effects of feed concentration and cross flow velocity

Ismail Koyuncu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

234 Citations (Scopus)

Abstract

In this study, DS5 DK type nanofiltration membranes were tested to recycle the reactive dye bath effluents. Reactive black 5 (RB5), reactive orange 16 (RO16), reactive blue 19 (RB19) and NaCl were used in the experiments to prepare the synthetic dye and salt mixtures. Effects of feed concentration, pressure and cross flow velocity on the permeate flux and color removal were investigated. Permeate flux increased with increasing pressure for all NaCl solutions. Dye concentration had a significant effect on flux values. Under the fixed NaCl concentrations the flux decreased with increasing dye concentrations. Dye rejections greater than 99% were achieved. Permeate was almost colorless. A gel layer formed by the rejected dye on membrane surface operates as a resistance to the permeation of dyes due to complete rejection of high molecule weight dyes, especially for the low salt concentrations. The presence of salt concentration has an interesting effect on color removal. Color removal decreased with increasing salt concentration. Cross flow velocities had also a significant effect on flux values. The dye formed agglomerates at high NaCl concentrations. High cross flow velocities decreased this effect.

Original languageEnglish
Pages (from-to)243-253
Number of pages11
JournalDesalination
Volume143
Issue number3
DOIs
Publication statusPublished - 10 Jun 2002

Funding

This researchw as carriedo ut under funding from Istanbul Technical University project no: 1451 . The authorw ould like to thank Professor Jack Gilron (Ben Gurion University) for his comments and also to Istanbul Technical University researchf oundationf or their support to the lab-scalem embraneu nit and flat sheet membranes.

FundersFunder number
Istanbul Teknik Üniversitesi1451

    Keywords

    • Color removal
    • Fouling
    • Nanofiltration
    • Reactive dyes
    • Textile dye baths

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