Forward osmosis system employing improved draw fluid

A method for purifying received water comprising a dissolved solute, comprising:

• evaporating a quantity of draw solution solvent in a draw solution water removal unit, thereby forming evaporated draw solution solvent, wherein the draw solution solvent comprises a nonaqueous liquid having a boiling point lower than water;
• collecting evaporated draw solution solvent at a condenser positioned above the draw solution water removal unit, the condenser positioned and configured to receive draw solution solvent evaporated upward from the draw solution water removal unit;
• condensing the evaporated draw solution solvent from a gaseous state to a liquid state, thereby forming anhydrous liquid condensed draw solution solvent;
• providing the anhydrous liquid condensed draw solution solvent to a second chamber of a forward osmosis container comprising a semipermeable membrane dividing the forward osmosis chamber into a first chamber and the second chamber, wherein the second chamber provides a water diluted draw solution solvent to the draw solution water removal unit;
• and
• providing the received water at an input mass per unit of volume to the first chamber and providing a fluid output having an output mass per unit of volume greater than the input mass per unit of volume.

A forward osmosis system, comprising:

• a forward osmosis container comprising a semipermeable membrane dividing the forward osmosis chamber into a first chamber and a second chamber, wherein the first chamber intakes received water comprising a dissolved solute at an input parts per million level and provides a fluid output having an output parts per million level greater than the input parts per million level;
• a draw solution water removal unit comprising a quantity of water and a quantity of draw solution solvent, wherein the draw solution solvent comprises a nonaqueous liquid having a boiling point greater than water;
• and
• a condenser positioned above the draw solution water removal unit, the condenser configured to collect draw solution solvent vapor evaporated upward from the draw solution water removal unit, condense collected evaporated draw solution solvent vapor from a gaseous state into a liquid state thereby forming anhydrous liquid draw solution solvent, and provide the anhydrous liquid draw solution solvent to the second chamber;
• wherein the second chamber provides a water diluted draw solution solvent to the draw solution water removal unit.