| 摘要 |
The present invention relates to a method for purifying water comprising the steps of: - providing a feed solution stream (10) comprising water, having a first osmotic pressure and a temperature T1 on a feed side (4) of a semipermeable membrane (3); - providing a draw solution stream (11) comprising a draw solute, having a second osmotic pressure and a temperature T2 on a draw side (5) of the semipermeable membrane (3), the second osmotic pressure being higher than the first osmotic pressure; - passing water through the semipermeable membrane (3) to the draw side (5) so as to mix the water with the draw solution stream (11) to produce a diluted draw solution stream (12) having a temperature T3; characterized in that - the temperature T2 of the draw solution stream (11) is higher than the temperature T1 of the feed solution stream (10), such that the temperature T3 of the diluted draw solution stream (12) is lower than temperature T2; - at least one solar panel (13) is provided, said solar panel (13) comprising a heat exchange tubing system (14) being in communication with the draw side (5) and said solar panel (13) having a temperature T4 being higher than the temperature T3; - the diluted draw solution stream (12) is passed into the heat exchange tubing system (14) such that the solar panel (13) is cooled down to a temperature T5 and the diluted draw solution stream (12) is heated, thereby forming a heated draw solution stream (22) having a temperature Τ6; - the heated draw solution stream (22) is passed into a separation unit (17) such that said stream (22) is separated into a stream of purified water (24) and a stream of recovered draw solution (23); - the stream of recovered draw solution (23) is passed to the draw side (5) of the semipermeable membrane (3) to be recycled. A system for purifying water, and use thereof, is provided as well. |
