| US 7,520,993 B1 | ||
| Water treatment process for oilfield produced water | ||
| James W. Laraway, West Jordan, Utah (US); Richard E. Weber, Zephyrhills, Fla. (US); and Donald J. Thomas, Tooele, Utah (US) | ||
| Assigned to Water & Power Technologies, Inc., Salt Lake City, Utah (US) | ||
| Filed on Dec. 06, 2007, as Appl. No. 11/999,582. | ||
| Int. Cl. B01D 61/00 (2006.01); C02F 1/44 (2006.01); A61M 1/16 (2006.01); B01J 30/00 (2006.01) | ||
| U.S. Cl. 210—652 [210/639; 210/650; 210/767; 210/749; 210/766; 210/805; 210/660; 210/175; 210/195.2; 96/234] | 19 Claims |
| 1. A method of treating an aqueous liquid containing dissolved minerals and dissolved hydrocarbons, the method comprising:
passing an aqueous liquid containing dissolved minerals and dissolved hydrocarbons through a warm lime softener, with a pH
of liquid in the warm lime softener raised to a pH of about 11;
adjusting the pH of an effluent from the warm lime softener to a pH of between about 9 and about 9.6 by adding a mineral acid;
and
passing the effluent from the warm lime softener through a microfilter and an ion exchange based softener in fluid communication
with the microfilter prior to contacting a reverse osmosis system; and
passing an effluent from the reverse osmosis system through an air stripper.
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