%0 Journal Article
%T Temperature and Pressure Effects of Desalination Using a MFI-Type Zeolite Membrane
%A Bo Zhu
%A Jun Hyun Kim
%A Yong-Han Na
%A Il-Shik Moon
%A Greg Connor
%A Shuichi Maeda
%A Gayle Morris
%A Stephen Gray
%A Mikel Duke
%J Membranes
%D 2013
%I MDPI AG
%R 10.3390/membranes3030155
%X Zeolites are potentially a robust desalination alternative, as they are chemically stable and possess the essential properties needed to reject ions. Zeolite membranes could desalinate ¡°challenging¡± waters, such as saline secondary effluent, without any substantial pre-treatment, due to the robust mechanical properties of ceramic membranes. A novel MFI-type zeolite membrane was developed on a tubular ¦Á-Al 2O 3 substrate by a combined rubbing and secondary hydrothermal growth method. The prepared membrane was characterised by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and single gas (He or N 2) permeation and underwent desalination tests with NaCl solutions under different pressures (0.7 MPa and 7£¿MPa). The results showed that higher pressure resulted in higher Na + rejection and permeate flux. The zeolite membrane achieved a good rejection of Na + (~82%) for a NaCl feed solution with a TDS (total dissolved solids) of 3000 mg¡¤L £¿1 at an applied pressure of 7£¿MPa and 21 ¡ãC. To explore the opportunity for high salinity and high temperature desalination, this membrane was also tested with high concentration NaCl solutions (up to TDS 90,000£¿mg¡¤L £¿1) and at 90£¿¡ãC. This is the first known work at such high salinities of NaCl. It was found that increasing the salinity of the feed solution decreased both Na + rejection and flux. An increase in testing temperature resulted in an increase in permeate flux, but a decrease in ion rejection.
%K desalination
%K MFI-type zeolite membrane
%K rubbing method
%K seeded secondary growth
%U http://www.mdpi.com/2077-0375/3/3/155