Method for extracting phosphorus from organic residues

I.C. Regelink (Inventor), O.F. Schoumans (Inventor), G.O.J. Smith (Inventor), S.J.G. Everlo (Inventor)

Research output: PatentOther research output

Abstract

The present invention relates to a method for extracting phosphorus from organic matter, the method comprising (a) providing phosphorus-containing organic matter, wherein the organic matter further contains calcium and/or iron; (b) adding acid and sulphate-containing water to the organic matter provided in step (a) to solubilize phosphorus, allow calcium sulphate and/or iron sulphate to form, and obtain a slurry; (c) separating the slurry obtained in step (b) into a solid fraction having a water content of at most 80 wt.%, and a liquid fraction having a water content of at least 80 wt.%; (d) adding a magnesium-containing base to the liquid fraction as obtained in step (c) to obtain phosphorus precipitate in the form of struvite.
Original languageEnglish
Patent numberEP3696142
Priority date12/02/19
Publication statusPublished - 19 Aug 2020

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