Water treatment equipment

A water treatment equipment comprising:

• a phosphorus adsorbent which adsorbs phosphorus contained in water to be treated;
• a reactor vessel 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 reactor vessel, 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 which has been subjected to the passing treatment;
• a second liquid passing mechanism configured to pass and circulate, through the reactor vessel, a regeneration agent liquid which generates the phosphorus adsorbent;
• and
• a discharge mechanism configured to discharge the liquid held in the reactor vessel after passing the water or the phosphorus desorption agent liquid through the reactor vessel.