| 摘要 |
<p>The purpose of the present invention is to provide a device for recovering phosphorus from phosphorus-containing water, the device eliminating the deposition of aggregating phosphorus and preventing the recovery of phosphorus from decreasing. The purpose is accomplished with a phosphorus recovery device equipped with a crystallization reaction tower (2) for recovering phosphorus, the crystallization reaction tower (2) having a raw-water introduction opening (17) disposed at the lower part and a treated-water discharge opening (20) disposed in the upper part and being equipped outside with a pH regulation tank (3) for pH regulation. One end of upper circulatory piping (30) has been connected to the discharge opening (20), and the other end has been connected to the pH regulation tank (3). The pH regulation tank (3) has been connected to the lower part of the crystallization reaction tower (2) with lower circulatory piping (31). The crystallization reaction tower (2) has a configuration in which raw water introduced through the raw-water introduction opening (17) ascends in the crystallization reaction tower (2), during which the phosphorus is recovered. The treated water is sent as circulating water from the discharge opening (20) to the pH regulation tank (3) through the upper circulatory piping (30), and the treated water after having undergone pH regulation is returned and circulated as circulating water to the lower part of the crystallization reaction tower (2) through the lower circulatory piping (31).</p> |
