Water treatment equipment

Abstract

According to one embodiment, water to be treated is passed through each of a first reactor vessel and second reactor vessel, phosphorus contained in the water is removed by using an adsorbent, thereafter the liquid held in each of the reactor vessels is discharged from each of a first treated water discharge path and second treated water discharge path, and thus the influence of soluble impurities derived from the water is eliminated. Further, when suspended solids impurities contained in the water are accumulated in the phosphorus adsorbent, the accumulated impurities are eliminated by a reverse cleaning operation using a liquid to be thereafter introduced from a reactor vessel liquid introduction path into the reactor vessel, and hence the influence of the suspended solids in the water on a desorption agent liquid to be thereafter introduced into a crystallization vessel, and containing phosphorus from the phosphorus adsorbent is eliminated.

1 . A water treatment equipment comprising:
 a reactor vessel including an absorbent packed bed filled with a phosphorus adsorbent which adsorbs phosphorus contained in water to be treated;   an introduction path configured to introduce the water to be treated into the reactor vessel;   a discharge path configured to discharge, from the reactor vessel, the water from which phosphorus has been removed;   a water 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; and   an upward flow formation path communicated with a lower part of the reactor vessel, and configured to upwardly introduce a liquid into the reactor vessel to form an upward flow after the water which has been held in the reactor vessel is discharged from the reactor vessel.   
     
     
         2 . The water treatment equipment according to  claim 1 , wherein the liquid introduced from the upward flow formation path into the reactor vessel is the phosphorus desorption agent liquid. 
     
     
         3 . The water treatment equipment according to  claim 1 , wherein the liquid introduced from the upward formation path into the reactor vessel is cleaning water which back washes the solids contained in the water and accumulated in the reactor vessel. 
     
     
         4 . The water treatment equipment according to  claim 1 , further comprising a phosphorus adsorbent regeneration mechanism configured to pass a regeneration agent liquid which regenerates the phosphorus adsorbent through the reactor vessel after passing of the phosphorus desorption agent liquid through the reactor vessel. 
     
     
         5 . The water treatment equipment according to  claim 1 , further comprising a solid-liquid separation mechanism arranged on the introduction path. 
     
     
         6 . The water treatment equipment according to  claim 1 , further comprising a solid-liquid separation mechanism arranged on the discharge path. 
     
     
         7 . The water treatment equipment according to  claim 4 , comprising a plurality of the reactor vessels, wherein the water passing mechanism and the phosphorus adsorbent regeneration mechanism are alternately switched between each other to continuously remove and recover phosphorus in the water. 
     
     
         8 . The water treatment equipment according to  claim 1 , wherein the phosphorus desorption agent liquid is an alkaline agent liquid. 
     
     
         9 . The water treatment equipment according to  claim 1 , wherein the phosphorus recovery mechanism comprises a mechanism configured to bring the phosphorus desorption agent liquid which has passed through the reactor vessel into contact with hydroxyapatite and a calcium hydroxide liquid. 
     
     
         10 . The water treatment equipment according to  claim 1 , wherein the water is a sludge-separated liquid discharged from a treatment process of sludge derived from biological water treatment.