| US 7,501,065 B1 | ||
| Methods for treating agricultural drainage water and the like | ||
| Mansour S. Bader, P.O. Box 10675, College Station, Tex. 77842-0675 (US) | ||
| Filed on May 08, 2006, as Appl. No. 11/430,235. | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. B01D 61/00 (2006.01); E21B 43/00 (2006.01); B01D 63/00 (2006.01) | ||
| U.S. Cl. 210—652 [210/650; 166/371; 166/279; 166/300; 166/309; 166/310] | 14 Claims |
| 1. A method for producing sodium sulfate and sodium chloride from saline water, said method comprising the steps of:
(a) removing sulfate scale and impurities from said saline water by
(i) injecting said saline water into a first precipitator at a pressure between 200 psi and 1,000 psi through at least one
nozzle to produce a jet stream from said saline water;
(ii) injecting amine solvent or amine solvent with modifier into said first precipitator at a pressure between 200 psi and
the critical pressure of said amine solvent or said amine solvent with modifier through at least one nozzle to form precipitates
comprising said sulfate scale and said impurities from said saline water;
(iii) filtering said saline water to remove said precipitates in the under-flow of a first filter and to produce intermediate
saline water in the over-flow of said first filter;
(iv) removing at least most of said amine solvent or said amine solvent with modifier from said under-flow of said first filter
by a first stripping unit;
(b) removing sodium sulfate from said intermediate saline water by
(i) injecting said intermediate saline water into a second precipitator at a pressure between 200 psi and 1,000 psi through
at least one nozzle to produce a jet stream of said intermediate saline water;
(ii) injecting said amine solvent or said amine solvent with modifier into said second precipitator at a pressure between
200 psi and the critical pressure of said amine solvent or said amine solvent with modifier through at least one nozzle to
form precipitates comprising said sodium sulfate from said intermediate saline water;
(iii) filtering said intermediate saline water to remove said precipitates in the under-flow of a second filter and to produce
sodium chloride rich water in the over-flow of said second filter;
(iv) removing at least most of said amine solvent or said amine solvent with modifier from said under-flow of said second
filter by a second stripping unit;
(v) removing at least most of said amine solvent or said amine solvent with modifier from said over-flow of said second filter
by a third stripping unit;
(c) recycling said sodium chloride rich water through said method to depress the solubility limits of said sodium sulfate;
or
(d) using said sodium chloride rich water to irrigate salt tolerant crops; or
(e) blending said sodium chloride rich water with irrigation water to irrigate low salt tolerant crops; or
(f) using said sodium chloride rich water to construct salt gradient solar ponds to produce energy; or
(g) evaporating said sodium chloride rich water in solar stills to produce sodium chloride.
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