Forward Osmosis refers to the process in which water flows from the higher hydrochemical potential (or lower osmotic pressure) side region to the lower hydrochemical potential (or higher osmotic pressure) side region through selective permeable membranes. Two solutions with different osmotic pressures are placed on both sides of the membrane with selective permeability. One is, feed solution, with lower osmotic pressure, the other is, Draw solution, with higher osmotic pressure. The osmotic pressure difference between the solutions on both sides of the membrane is used as the driving force to make water. It can spontaneously pass the selected permeable membrane from the original liquid side to the driving liquid side.
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