| 摘要 |
PROBLEM TO BE SOLVED: To provide a device for recovering phosphorus from phosphorus-containing water, in which agglomerating phosphorus is not precipitated and a phosphorus recovery rate is not lowered.SOLUTION: A device for recovering phosphorus includes a crystallization reaction tower 2 for recovering phosphorus by a crystallization reaction. An raw water introduction port 17 is arranged in the lower part of the crystallization reaction tower 2, a discharge port 20 of treated water is arranged in the upper part thereof and a pH adjustment tank 3 for adjusting pH is arranged on the outside of the crystallization reaction tower 2. One end of an upper part circulation pipeline 30 is connected to the discharge port 20 of treated water and another end of the upper part circulation pipeline 30 is connected to the pH adjustment tank 3. The pH adjustment tank 3 is connected to the lower part of the crystallization reaction tower 2 by a lower part circulation pipeline 31. While the raw water introduced from the raw water introduction port 17 of the lower part of the crystallization reaction tower 2 is made to ascend inside the crystallization reaction tower 2, phosphorus is recovered therefrom, and then the raw water is sent from the discharge port 20 of treated water in the upper part of the crystallization reaction tower 2 to the pH adjustment tank 3 through the upper part circulation pipeline 30 as circulating water. The treated water after pH adjustment is returned and circulated as circulating water to the lower part of the crystallization reaction tower 2 through the lower part circulation pipeline 31. |
