| US 7,550,087 B2 | ||
| Apparatus and method for treating FGD blowdown or similar liquids | ||
| Jeffrey Gerard Peeters, Toronto (Canada); William A. Bonkoski, Wilmington, Del. (US); Pierre Lucien Cote, Dundas (Canada); and Hidayat Husain, Oakville (Canada) | ||
| Assigned to Zenon Technology Partnership, Wilmington, Del. (US) | ||
| Filed on Dec. 11, 2006, as Appl. No. 11/609,089. | ||
| Application 11/609089 is a continuation of application No. PCT/CA2006/001220, filed on Jul. 24, 2006. | ||
| Claims priority of provisional application 60/701996, filed on Jul. 25, 2005. | ||
| Claims priority of provisional application 60/736859, filed on Nov. 16, 2005. | ||
| Claims priority of application No. 2517322 (CA), filed on Aug. 26, 2005. | ||
| Prior Publication US 2007/0114174 A1, May 24, 2007 | ||
| Int. Cl. C02F 3/30 (2006.01) | ||
| U.S. Cl. 210—630 [210/617; 210/631; 210/903; 210/912] | 9 Claims |
| 1. A process for the treatment of a liquid comprising:
a) physical and/or chemical pretreatment of the liquid to remove total suspended solids and to soften the liquid;
b) ammonia stripping of the liquid;
c) anoxic treatment to remove nitrate;
d) a second anoxic treatment after step (c) to remove selenium and anaerobic treatment to remove heavy metals; and,
e) membrane separation of the liquid upstream of step (d).
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