Porous glass desalination membranes: phenomenological transport coefficients and fixed charge salt exclusion |
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| Authors: | Georges Belfort Jan Scherfig |
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| Affiliation: | Human Environmental Health Sciences Program, School of Applied Science and Technology, The Hebrew University of Jerusalem Israel;Environmental Resources Engineering, School of Engineering, University of California, Irvine, Calif. 92664 U.S.A. |
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| Abstract: | The independent phenomenological transport coefficients for two porous glasses of different average pore diameter and surface charge densities were measured and compared with similar parameters of the asymmetric cellulose acetate membrane.The bound water model is used to explain the variation of the specific hydraulic permeability with pressure. Viscous and diffusive flow are discussed and the fixed charge model tested for one of the porous glasses.The results indicate that these porous glasses have inherently good potential practical desalination properties, their main limitation being imperfections or large cavities which are responsible for viscous flow, membrane degradation and solute leakage. |
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