| 摘要 |
PROBLEM TO BE SOLVED: To establish a novel technology capable of removing phosphoric acid ions at a high degree from water containing the phosphoric acid ions of a dilute concentration and recovering phosphorus as a high-value resource. SOLUTION: The method for removing and recovering the phosphoric acid ions from the phosphorus-containing water comprises adding iron hydroxide particles to the phosphorus-containing water (raw water) to remove the phosphoric acid ions in the raw water, adding an acid to an iron hydroxide particle slurry capturing the phosphoric acid ions to regulate the slurry to acidity below pH 3, then subjecting the slurry to a solid-liquid separation, returning the separated iron hydroxide particles separated therein and adding ammonium and Mg2+ to the separated liquid obtained by the solid-liquid separation to deposit NH4 MgPO4 precipitate under alkaline pH conditions, and the equipment for the same is also provided.
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