An analysis of the effects of pressure-assisted osmotic backwashing on the high recovery reverse osmosis system

Chemical, and physicochemical cleaning are recommended to regenerate the membrane performance

Naveenkumar Ashok Yaranal; Sneha Kumari; Selvaraju Narayanasamy; Senthilmurugan Subbiah

2019

Scholarcy highlights

  • Reverse osmosis is one of the widely used techniques for water purification and seawater desalination
  • To study and compare the effect of pressure-assisted osmotic BW cleaning at high recovery, the recovery of the system is fixed around 90%
  • The experimental results conclude that spiral-wound module with less pressure drop in the permeate channel can provide efficient PAO membrane BW
  • The use of concentrated feed solution during PAO BW will improve the BW efficiency, and it is achieved by using a concentrated brine
  • circuit RO system uses more equipment than the others, which leads to higher capital cost
  • A system without brine recycle is found to be more energy efficient than the other systems reported in this work, and this has to be verified for higher feed concentration
  • The effectiveness of pressure-assisted osmotic BW in Reverse osmosis membrane is counterbalanced, to some extent, by the significantly higher permeate total dissolved solids when backwash is applied

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