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Received August 24, 2004
Accepted September 7, 2005
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Effect of pH on the rejection of inorganic salts and organic compound using nanofiltration membrane
Ulsan Regional Innovation Agency, #758-2 Yenamdong, Buggu, Ulsan 683-804, Korea 1Department of Civil Engineering, Osaka Sangyo University, #3-1-1 Nakagaito, Daito, Osaka 574-8530, Japan 2Busan Environmental Technology Center, #216 Daeyeondong, Namgu, Busan 608-737, Korea
shijun55@ultra-net.org
Korean Journal of Chemical Engineering, January 2006, 23(1), 28-33(6), 10.1007/BF02705688
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Abstract
.Nanofiltration (NF) has recently received increased attention as a possible tertiary treatment process providing high rejection of solutes and high water flux rate. In this research, solute separation experiments using NF membranes were made with inorganic salts including heavy metal and organic compounds in different pH levels. The rejection of inorganics from feed solution was found to be dependent on the electric charge of membrane as well as the ionic radius and valence of ion. The divalent cation appeared to reduce the potential of negatively charged membrane to lower the rejection of ion. The results of organic compounds showed that the rejection could be estimated from the pKa value and molecular weight of organics, and the pH of the feed solution.
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References
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Childress AE, Elimelech M, Environ. Sci. Technol., 34(17), 3710 (2000)
Croll BT, J. IWEM, 6, 121 (1992)
Hodgson TD, Desalination, 8, 99 (1970)
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Kamiyama Y, Nitto Denko Tech. Report (in Japanese), 31, 408 (1993)
Kim S, Ozaki H, Terashima Y, Application of low pressure reverse osmosis to wastewater treatment, Proceeding of the 6th JSPS-VCC Seminar on Integrated Eng., 137 (1996)
Mulder M, Basic Principles of membrane technology, Kluwer Academic Publishers (2nd edition), Dordrecht, The Netherlands (1997)
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Trebouet D, Schlumpf JP, Jaouen P, Maleriat JP, Quemeneur F, Environ. Technol., 20, 587 (1999)
