Treatment of phosphate-containing wastewater with fluorosilicate and phosphate recovery

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United States of America Patent

PATENT NO 11919792
APP PUB NO 20140231359A1
SERIAL NO

14240701

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A method for treating phosphate-containing wastewater, such as phosphogypsum pond water. The method includes the steps of: (a) adding a first cation to the wastewater to precipitate fluorosilicate from the wastewater; (b) adding a second cation to the wastewater to precipitate fluoride from the wastewater; (c) raising the pH of the wastewater to precipitate the second cation from the wastewater; (d) removing residual silica from the wastewater; and (e) precipitating phosphate from the wastewater. The precipitated fluorosilicate may be sodium fluorosilicate. The precipitated phosphate may be struvite.

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Patent Owner(s)

Patent OwnerAddress
OSTARA NUTRIENT RECOVERY TECHNOLOGIES INCVANCOUVER BRITISH COLUMBIA V6E 2R1

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Britton, Ahren Brandon, US 9 39
Clark, Donald Robert Lutz, US 2 15
Cote, Pierre Dundas, CA 50 2128
Hyslop, Rhonda Maria North Vancouver, CA 3 23
Sathyanarayana, Ram Prasad Melahalli Vancouver, CA 6 40

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