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Removal of Surface Defects and Improvement of Properties of Reverse Osmosis Membrane in Water Treatment Process

Noroozali, Amir Arsalan | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52912 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Bastani, Dariush; Mousavi, Abbas
  7. Abstract:
  8. The purpose of this project is to correct the surface defects of the reverse osmosis membrane. The membrane tested in this project was a thin film made of three layers of polyester, polysulfone and polyamide. These three layers provide mechanical resistance to operating pressure, suitable substrate for polyamide layer synthesis and membrane selectivity, respectively.In order to improve the surface properties and modify the reverse osmosis membrane, it was first attempted to coat it with a protective layer of polyvinyl alcohol, then by modifying this layer and improving the properties of polyvinyl alcohol and synthesizing the sulfite agent on it by the esterification reaction, to the best possible efficiency. Let's get there. The pores in this layer were modified so that the salt flux would not be greatly reduced by increasing salt retreat. It should be noted that this project uses real-time industrial materials to produce realistic results so that we can give our readers and researchers a better view of the industry. In this project, in order to determine how the polyamide layer and the protective layer were formed, the effect of each parameter was investigated by scanning electron microscopy and Fourier transform infrared spectroscopy along with the contact angle examination, as well as the evaluation of the clogging of the modified and performed membranes. High pressure seawater simulation analysis was performed for all membranes and a complete analysis of the results was reported. The results of this project resulted in a 1.52 and 2.23% increase in salt recycling for polyvinyl alcohol and polyvinyl alcohol sulfate modification, respectively, with a acceptable reduction of 12.2 and 9.7% in the passage rate of polyvinyl alcohol modified membranes, respectively. Alcohol and polyvinyl alcohol are sulfated compared to the raw membrane. On the other hand, based on the analysis of the final synthesized membrane, it has a lower contact angle, is much more hydrophilic and less clogged than the raw membrane
  9. Keywords:
  10. Thin Layer Membrane ; Poly Vinyl Alcohol ; Reverse Osmosis ; Reverse Osmosis Membrane ; Reverse Osmosis Modification

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