Patent ID: 8394267

Claim:
A water treatment equipment comprising: a phosphorus adsorbent which adsorbs phosphorus contained in water to be treated; a reactor vessel including a packed bed which is filled with the phosphorus adsorbent; an introduction path configured to introduce the water into the reactor vessel, and a discharge path configured to discharge, from the reactor vessel, the water from which phosphorus has been removed; a first liquid passing mechanism configured to pass, through the packed bed in the reactor vessel as a downward flow, a phosphorus desorption agent liquid which desorbs phosphorus from the phosphorus adsorbent which has adsorbed phosphorus; a phosphorus recovery mechanism configured to recover phosphate from the phosphorus desorption agent liquid passed by the first liquid passing mechanism; a second liquid passing mechanism configured to pass and circulate, through the packed bed in the reactor vessel, a regeneration agent liquid which restores the phosphorus adsorptive capability of the phosphorus adsorbent; a phosphorous desorption agent liquid discharge path configured to discharge the phosphorus desorption agent liquid from the reactor vessel; and a regeneration agent liquid discharge path configured to discharge the regeneration agent liquid from the reactor vessel.