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Cho, Jaeweon
OWIELAB(Organic-Water Interface Engineering Laboratory)
Research Interests
  • Convergence of Science and Arts, Feces Standard Money (FSM), Water & Energy

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Ion transport characteristics in nanofiltration membranes: measurements and mechanisms

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Title
Ion transport characteristics in nanofiltration membranes: measurements and mechanisms
Author
Park, NoeonCho, JaeweonHong, SeungkwanLee, Sangyoup
Keywords
Effective diffusivity;  Effective osmotic pressure;  Ion transport characteristics;  Nano-colloids;  Nanofiltration
Issue Date
2010
Publisher
IWA PUBLISHING
Citation
JOURNAL OF WATER SUPPLY RESEARCH AND TECHNOLOGY-AQUA, v.59, no.2-3, pp.179 - 190
Abstract
Ion transport characteristics during nanofiltration (NF) were investigated by measuring effective osmotic pressure and diffusivity experimentally. Effective osmotic pressure and diffusivity were measured through lab-scale transport and diffusion tests. First, it was shown that the water flux across NF membranes decreased dramatically with increasing ionic strength because of the noticeable increase in effective osmotic pressure. Second, the results from transport experiments showed that the ion selectivity values, which were derived from the thermodynamic model, decreased with increasing ionic strength. Third, by analysing the data of measured osmotic pressure and diffusivity, it was demonstrated that the former and the latter increased and decreased, respectively, as ionic strength increased. The experimentally determined osmotic pressure across NF membranes was much lower than that calculated theoretically. At best, around 5% or less of the theoretical osmotic pressure was obtained under the experimental conditions investigated. The effective osmotic pressure and ion rejection decreased in the presence of nano-colloids. The influence of nano-colloids on ionic transport was found to be dependent on the concentration and size of the nano-colloids. Therefore, ion transport characteristics across NF membranes can be determined practically by measuring effective osmotic pressure and diffusivity as these reflect both feed water and membrane properties
URI
DOI
10.2166/aqua.2010.034
ISSN
0003-7214
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