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Effect of Electromagnetic Field on Membrane Fouling in Filtration Process

Rouina, Mohammad | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47266 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Kariminia, Hamid Reza; Mousavi, Abbas
  7. Abstract:
  8. Current research studies the effect of electromagnetic field on reducing precipitation on membrane surface in reverse osmosis. Reverse osmosis is one of the most widely applied methods for water desalinization. Despite its advantages over other desalinization techniques, suffers from shortcomings such as blockage of membrane surface. Use of magnetic fields for reducing precipitation in process equipment, the so-called magnetic treatment, has been studied and practiced for decades. This research intends to study the effect of electromagnetic field on water and its mineral content, and the possibility of its application as a method for reducing precipitation and blockage in reverse osmosis process. In fact, the novelty of this study was to combine the two methods of electromagnetic treatment and reverse osmosis to improve the efficiency of reverse osmosis process. Therefore, modifications were made in the reverse osmosis system and electromagnetic field was applied across the membrane surface. Experiments were conducted to study minerals i.e. sodium chloride (NaCl), calcium carbonate (CaCO3) and calcium sulfate (CaSO4) from water solutions used as feed. Electrical conductivity (EC) and volumetric flowrates of the permeate and retentate streams were compared in the presence and absence of an electromagnetic field. Results indicated that use of an electromagnetic field increased salt removal by 2 to 5% on average, and increased permeate flowrate through the membrane by 30 to 35%. Moreover, employing an electromagnetic field, in addition to being cost effective, significantly reduced the blockage caused by precipitation and improved the performance of the membrane
  9. Keywords:
  10. Reverse Osmosis Membrane ; Electromagnetic Fields ; Improving Efficiency Method ; Filtration ; Membrane Blockage

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