Patent ID: 7655145

Claim:
A method for treatment of a liquid containing urea, the method comprising: receiving a liquid containing urea (urea containing liquid or “UCL”), having a salt content of at least 5 gm/liter and having a total organic content (“TOC”) of at least 2500 mg/liter; passing the UCL through an activated carbon filter to produce an intermediate liquid, in which at least 90 percent of organic molecules have been removed, within about one hour after the UCL was generated; providing a semipermeable membrane, having a first side and a second side, and being selected to allow passage therethrough of water in the intermediate liquid in a direction that tends to equalize osmotic potential of water on the first and second sides of the membrane; positioning the intermediate liquid in contact with at least a portion of the membrane first side; positioning a concentrated fortified drink, having a higher liquid osmotic potential for water than a UCL osmotic potential for water on the membrane first side, in contact with at least a portion of the membrane second side; and allowing a portion of the intermediate liquid to pass through the membrane from the first side to the second side to tend to reduce an imbalance of osmotic potential of the liquids on the first and second sides of the membrane, and to produce a processed liquid having a TOC of no more than 25-50 mg/liter.