Studies on desalination performance of nanofiltration membranes and its application to seawater desalination
Received date: 2005-10-27
Revised date: 2005-10-27
Online published: 2010-10-01
Desalination experiments of four inorganic salt solutions (NaCl, Na2SO4, MgCl2, MgSO4) have been carried out by using a kind of nanofiltration membranes(ESNA1). The effects of the species and the concentration of salts as well as the operation pressure on the separation performance and the stability of nanofiltration membranes desalination have been investigated. Some rules of the desalination with nanofiltration membranes are gained. Studies on desalination performance of artificial seawater and seawater are also introduced. Results from the desalination of inorganic salt solutions show that salt rejection increases with the increase of operational pressure, while decreased with the increase of salt concentration. Furthermore, operational pressure and salt concentration made more effect on salt rejection of univalent salt solutions than on that of bivalent salt solutions. Results from artificial seawater and seawater desalination show that ESNA1 membrane is stable during the experiment and the flux is high under lowoperational pressure. What’s more, for all of the ions(Ca2+,Mg2+, SO42-),ESNA1 could achieved salt rejections up to 90%. The preliminary estimation considers that this nanofiltration membrane could be used to pretreat seawater.
Key words： membrane separation; nanofiltration; seawater desalination
Wang Yuhong, Su Baowei, Xu Jia, Ruan Guoling, Gao Congjie . Studies on desalination performance of nanofiltration membranes and its application to seawater desalination[J]. Industrial Water Treatment, 2006 , 26(2) : 46 -49 . DOI: 10.11894/1005-829x.2006年.26（02）.46
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