Patent ID: 9216917
Filing Date: 2015-12-22
Classification: B01D,C02F,Y02A,Y02W

Abstract:
1. A process for purifying contaminated water comprising: providing a contaminated feed solution stream comprising water and having a first osmotic pressure on a feed side of a semipermeable membrane; providing a liquid draw solution stream comprising a liquid draw solute and having a second osmotic pressure on a draw side of the semipermeable membrane; passing water through the semipermeable membrane to the draw side to produce a diluted draw solution stream; heating the diluted draw solution stream to initiate phase separation and produce a two phase effluent stream comprising a liquid phase of draw solute and a liquid phase of water; separating the agglomerated draw solute from the two phase effluent stream using a gravity phase separator to produce a water rich stream comprising water and residual draw solute and a solute rich stream comprising agglomerated draw solute and water; cooling the water rich stream to produce a cooled single phase water rich stream; and separating the residual draw solute from the cooled single phase water rich stream to produce a residual draw solute stream and a purified water product stream.