The rejection of single electrolytes at six different nanofiltration membranes has been experimentally studied. The membranes were chosen to cover the range of pore sizes from ultrafiltration to reverse osmosis and to represent the different types of polymer used for membrane fabrication. The experimental data has been interpreted using a model based on the extended Nernst-Planck equation, with the capability of predicting the rejection at a charged membrane in single and mixed electrolytes. The model accounts for the hindered nature of transport in the membranes. When used in conjunction with experimental data for single salt solutions, the model allows the determination of two important parameters: an effective membrane thickness and an effective membrane charge density. A knowledge of the effective membrane thickness and effective membrane charge density allows the model to predict the separation of mixtures of electrolytes at the membranes. Excellent agreement between these predictions and experimental data for mixtures is obtained.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:638272 |
| Date | January 1995 |
| Creators | Mukhtar, H. |
| Publisher | Swansea University |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
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