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US 2015/0001159 A1Published application
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.
Claims9
A process for 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 the precipitated phosphates comprise brushite;
- and
- removing the precipitated phosphates from the wastewater.
A process for removing phosphates from wastewater containing solubilized phosphates, the process comprising the steps of:
- raising the pH of the wastewater to a value in the range from 6.1 to 7 by adding calcium oxide or calcium hydroxide to the wastewater, whereby solubilized phosphates are precipitated and further wherein brushite is the predominant mineral in the precipitated phosphates;
- and
- removing the precipitated phosphates from the wastewater.
Dependencies are inferred from the claim text.