Fatty acids fouling on forward osmosis membrane: impact of pH

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The fouling propensity of the fatty acids is investigated during the operation of the osmotically driven membrane process. Experiments were performed at various pH values ranged from 4.0 to 9.0 in the presence of the octanoic acid as the model fatty acids. Results demonstrated that the fatty acid fouling was significantly dependent on the changes of pH. In all tested pH values, permeate flux was sharply decreased during the initial coverage of fatty acids on the membrane surface, then slowly decreased as the fatty acid layer became developed. At pH 9.0, fouling propensity was less than those of pH values around 4.9 (pKa of octanoic acid) due to the protonation of the carboxylic group of octanoic acid molecules, which resulted in electrostatic repulsion between octanoic acid molecules and membrane surfaces. The measurement of contact angle and FTIR spectra also supports that more octanoic acid molecules are adsorbed on FO membrane surfaces at the low pH than at the high pH.
Publisher
DESALINATION PUBL
Issue Date
2016-04
Language
English
Article Type
Article; Proceedings Paper
Citation

DESALINATION AND WATER TREATMENT, v.57, no.16, pp.7531 - 7537

ISSN
1944-3994
DOI
10.1080/19443994.2015.1030118
URI
http://hdl.handle.net/10203/212581
Appears in Collection
CE-Journal Papers(저널논문)
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