METHOD FOR RECOVERING PHOSPHORUS IN WATER BEING TREATED

The method of an embodiment for recovering phosphorus in water that is being treated is provided with: a step for stirring and mixing a specified amount of hydrochloric acid into a slag slurry made of steel making slag and water to obtain a phosphorus recovery slag slurry in which Ca in the steel making slag has been eluted; a step for forming a compound containing phosphorus and Ca by stirring and mixing a phosphorus-containing water to be treated into the phosphorus recovery slag slurry and then leaving the mixture undisturbed to aggregate and precipitate said compound as a solid along with the residue of said steel making slag; and a step for recovering the precipitated solids. In the step for obtaining the phosphorus recovery slag slurry, the hydrochloric acid is added while maintaining the pH of the slag slurry during the hydrochloric acid addition in the range of 4.5-7.0. 本实施方式的被处理水中的磷的回收方法具备下述阶段：在包含炼钢炉渣和水的炉渣浆料中，将规定量的盐酸进行搅拌混合而得到使上述炼钢炉渣中的Ca溶出了的磷回收用炉渣浆料；通过在上述磷回收用炉渣浆料中搅拌混合含有磷的被处理水后进行静置，从而形成含有磷和Ca的化合物，使上述化合