Washington State University

Multiform Harvest Inc.

Joseph H Harrison

Shulin Chen

Keith E Bowers

Tianxi Zhang

Particular aspects provide a method for recovering phosphate, comprising: obtaining an effluent or wastewater, etc. having calcium-sequestered phosphate; adding to the effluent or wastewater a calcium chelating or sequestration agent suitable to chelate or sequester Caions from the calcium-sequestered phosphate to facilitate release of phosphate from the calcium-sequestered phosphate; transferring, facilitated by said Caion capture and in the presence of sufficient concentrations of NHand Mgions, of the phosphate into struvite (magnesium ammonium phosphate hexahydrate or MgNHPO.6HO), or hydrated magnesium ammonium complex of phosphate; and recovering the struvite, or the formed hydrated magnesium ammonium complex. Preferably, the method further comprises acidification of the effluent or wastewater to facilitate release of Caions from the calcium-sequestered phosphate and chelation of sequestration of the Caions by the calcium chelating or sequestration agent. Additional aspects provide a phosphate-containing fertilizer comprising struvite, and methods for making same.

Growing community of inventors

Puyallup, WA, United States of America

Joseph H Harrison