Evidence of changes in membrane pore characteristics due to filtration of dye bath liquors

Denyer, P., Shu, L. and Jegatheesan, V. 2007, Evidence of changes in membrane pore characteristics due to filtration of dye bath liquors, Desalination, vol. 204, no. 1-3, pp. 296-306, doi: 10.1016/j.desal.2006.04.033.

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Title Evidence of changes in membrane pore characteristics due to filtration of dye bath liquors
Author(s) Denyer, P.
Shu, L.
Jegatheesan, V.
Journal name Desalination
Volume number 204
Issue number 1-3
Start page 296
End page 306
Publisher Elsevier BV
Place of publication Amsterdam, The Netherlands
Publication date 2007-02-05
ISSN 0011-9164
Keyword(s) donnan potential
dye bath liquor
pore enlargement
salt solution
Summary This study was carried out to investigate the treatment of various salt solutions and synthetic dye bath liquors by nanofiltration using Nanomax-50 membrane in a stirred cell with 150 mL working volume. Donnan exclusion was compared by filtering salts with monovalent and divalent cations and anions. This was done by comparing three salts including sodium chloride (NaCl), calcium chloride (CaCl2) and sodium sulphate (Na2SO4). The rejection order determined was Na2SO4>NaCl>CaCl2 which is typical of a negatively charged membrane where Donnan and steric exclusion play an important role in separation. Studies on the flux and rejection characteristics of sodium sulphate were undertaken for concentrations ranging from 10 to 40 gl−1 thereby replicating actual dye bath salt concentrations. Synthetic dye bath liquors were prepared using acidic dye (Acid Green 25) at a fixed concentration of 100 mgl−1 with 10 and 15 gl−1 of sodium sulphate solutions. While, the results showed evidence of flux decline due to increased resistance and decreased transmembrane pressure, pore enlargement occurred after the filtration experiments with sodium sulphate solutions greater than 20 gl−1. Pore enlargement was even more prominent in the two synthetic dye bath liquors filtered. Pore enlargement was determined by observing the pure water flux before and after filtering sodium sulphate solutions or dye bath liquors. An increase in pore diameter of 58 and 94 %was estimated when dye bath liquors containing 10 and 15 gl−1 of sodium sulphate, respectively were filtered through the membrane. The following equation was derived in estimating the pore enlargement, where de1 and de2 are the apparent diameter of membrane pore sizes before and after filtration of salt solutions or dye bath liquors and Rm1 and Rm2 are the membrane resistance of pure water flux before and after filtration of salt solutions or dye bath liquors. These results have important implications for the application of nanofiltration technology to textile wastewater treatment and reuse.
Notes Presented at EuroMed 2006 conference on desalination strategies in south Mediterranean countries : cooperation between Mediterranean countries of Europe and the southern rim of the Mediterranean.
Language eng
DOI 10.1016/j.desal.2006.04.033
Field of Research 099999 Engineering not elsewhere classified
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2007, Elsevier
Persistent URL http://hdl.handle.net/10536/DRO/DU:30039712

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