Washington State University

Multiform Harvest Inc.

Tianxi Zhang

Shulin Chen

Craig Frear

Keith E Bowers

Anping Jiang

Joseph H Harrison

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.

Compositions and methods for wastewater treatment

An economical, integrated system works in series with anaerobic digestion of animal waste to recover nitrogen and phosphorous, while also scrubbing the produced biogas.

Combined nutrient recovery and biogas scrubbing system integrated in series with animal manure anaerobic digester

Growing community of inventors

Pullman, WA, United States of America

Tianxi Zhang