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US 10,294,167 B2Granted
Recovery of phosphorous
AssigneeCdem B.V.
InventorNicolaas Voogt
Life of this patent
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Abstract
A method for recovery of phosphorous, in particular of phosphorous from a waste stream, and a product obtained thereby. The product is in a form wherein phosphorous can be released to, e.g., the soil and plants at a desired amount per interval of time.
Claims14
An improved (semi)continuous method of recovering phosphorous from an aqueous solution comprising the steps of:
- providing the aqueous solution comprising soluble phosphorous, adding a composition, the composition comprising as mixed ingredients
- 5-40% CaO (w/w, relative to a total weight of the composition),
- 10-40% clay mineral, and
- 25-60% CaCO3,
- wherein 0.5-2 mole CaO/mole soluble P is added, and
- recovering the phosphorous, by forming a product comprising brushite (CaHPO4.2H2O), calcite (CaCO3), and meta-kaoline (Al2Si2O7),
- wherein the composition is not a calcium silicate hydrate (CSH).
4 more elements
Dependencies are inferred from the claim text.