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US 9,561,973 B2Granted
Phosphate recovery from wastewater
AssigneeNutrient Recovery & UpCycling, LLC
InventorPhillip Barak
Life of this patent
Estimating the term…
Abstract
Provided are methods for recovering phosphate from wastewater by treating the wastewater with calcium containing compounds to raise its pH to near neutral values in order to precipitate calcium phosphate compounds, such as brushite, from the wastewater.
Claims8
A process removing phosphates from wastewater containing solubilized phosphates, the process comprising the steps of:
- raising the pH of the wastewater to a pH of less than 8 by adding calcium containing compounds to the wastewater, whereby solubilized phosphates are precipitated and brushite is the predominant mineral in the precipitated phosphates;
- and
- removing the precipitated phosphates mixed with a magnesium phosphate, a magnesium ammonium phosphate, biosolids, iron, gypsum, or a combination thereof from the wastewater.
Dependencies are inferred from the claim text.