266869 High-Flux Reverse Osmosis Membranes for Brackish Water Desalination

Wednesday, October 31, 2012: 8:30 AM
403 (Convention Center )
Lin Zhao and W. S. Winston Ho, William G. Lowrie Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, OH

High-Flux Reverse Osmosis Membranes for Brackish Water Desalination

Lin Zhao, C.-Y. Chang, and W.S. Winston Ho, The Ohio State University

            Novel high-flux reverse osmosis membranes with hydrophilic additives were synthesized and characterized under brackish water desalination conditions.  Four selected hydrophilic additives, o-aminobenzoic acid-triethylamine salt, m-aminobenzoic acid-triethylamine salt, 2-(2-hydroxyethyl) pyridine, and 4-(2-hydroxyethyl) morpholine, were added into m-phenylenediamine (MPD) solution to react with trimesoyl chloride (TMC) during the interfacial polymerization between MPD and TMC.  The effects of different concentrations for each hydrophilic additive were evaluated using brackish water desalination tests with 2000 ppm NaCl solution at 225 psi and 25oC.  After the additive concentration was optimized, the synthesized membranes showed 36.7 gallons/ft2/day water flux and 98.2% salt rejection or greater. After the post-treatment using aqueous solutions containing glycerol, sodium lauryl sulfate, and camphorsulfonic acid-triethylamine salt, the water flux of the membrane was further increased. The resulting membrane showed a flux of 52.6 gallons/ft2/day and a salt rejection of about 98.8% or greater.  This membrane outperformed the other membranes evaluated, and it also exhibited a good stability in terms of water flux (average 50 gallons/ft2/day) and salt rejection (average 99%) during the entire period of a 30-day test with 2000 ppm NaCl solution at 225 psi and 25oC. The good stability was verified by comparing FTIR spectra of the same membrane sample before and after the 30-day test.

 


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See more of this Session: Membranes for Water Treatment I
See more of this Group/Topical: Separations Division