Ion transport characteristics in nanofiltration membranes: measurements and mechanisms

Abstract

Research Article| March 01 2010 Ion transport characteristics in nanofiltration membranes: measurements and mechanisms Noeon Park; Noeon Park 1R&D Budget Coordination Division, Korea Institute of Science and Technology Evaluation and Planning (KISTEP), 11F Dongwon Industry Bldg, 275, Yangjae-dong, Seocho-gu, Seoul 137-130, South Korea Search for other works by this author on: This Site PubMed Google Scholar Jaeweon Cho; Jaeweon Cho 2Department of Environmental Science and Engineering, Gwangju Institute of Science and Technology (GIST), 1 Oryong-dong, Buk-gu, Gwangju 500-712, South Korea Search for other works by this author on: This Site PubMed Google Scholar Seungkwan Hong; Seungkwan Hong 3Department of Civil, Environmental & Architectural Engineering, Korea University, 1, 5-ka, Anam-dong, Sungbuk-gu, Seoul 136-713, South Korea Search for other works by this author on: This Site PubMed Google Scholar Sangyoup Lee Sangyoup Lee 3Department of Civil, Environmental & Architectural Engineering, Korea University, 1, 5-ka, Anam-dong, Sungbuk-gu, Seoul 136-713, South Korea Tel.: +82-2-3290-3731 ; Fax: +82-2-928-7656; E-mail: sangyoup_lee@korea.ac.kr Search for other works by this author on: This Site PubMed Google Scholar Journal of Water Supply: Research and Technology-Aqua (2010) 59 (2-3): 179–190. https://doi.org/10.2166/aqua.2010.034 Article history Received: April 30 2009 Accepted: November 13 2009 Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Share Icon Share MailTo Twitter LinkedIn Tools Icon Tools Cite Icon Cite Permissions Search Site Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentAll JournalsThis Journal Search Advanced Search Citation Noeon Park, Jaeweon Cho, Seungkwan Hong, Sangyoup Lee; Ion transport characteristics in nanofiltration membranes: measurements and mechanisms. Journal of Water Supply: Research and Technology-Aqua 1 March 2010; 59 (2-3): 179–190. doi: https://doi.org/10.2166/aqua.2010.034 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex 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. effective diffusivity, effective osmotic pressure, ion transport characteristics, nano-colloids, nanofiltration This content is only available as a PDF. © IWA Publishing 2010 You do not currently have access to this content.