In membrane contact processes a concentration difference is applied over the membrane instead of a difference in mechanical pressure.
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These concentration differences can lead to a difference in osmotic pressure as in Forward Osmosis or a difference in vapor pressure as in Ammonia Membrane Stripping or Membrane Distillation. These new ways of membrane filtration opens new possibillities of selective concentration of fluids.
Examples of draw solution recovery technologies
Hydrophobic membranes for water vapour transport
Driving for based on difference in vapour pressure
Compact and scalable
Use of low grade thermal heat of 60 to 80 C