Patent ID: 8877049
Filing Date: 2014-11-04
Classification: B01J,C01B,C02F,Y10S

Abstract:
1. A water treatment equipment comprising: first and second reactor vessels each including an adsorbent packed bed filled with a phosphorus adsorbent which adsorbs phosphorus contained in water to be treated; a raw water supply source configured to supply the water to be treated into an upper part of each of the first and second reactor vessels; a desorption agent liquid supply source configured to supply a phosphorus desorption agent liquid into the upper part of each of the first and second reactor vessels; an introduction path which communicates with the raw water supply source and each of the first and second reactor vessels, configured to introduce the water to be treated into the upper part of each of the first and second reactor vessels; a first discharge path configured to discharge, from the first reactor vessel, the water from which phosphorus has been removed; a second discharge path configured to discharge, from the second reactor vessel, the water from which phosphorus has been removed; a third discharge path communicating with a lower part of the first reactor vessel and configured to discharge first desorption agent liquid passing treatment water from the lower part of the first reactor vessel, wherein the first desorption agent liquid passing treatment water contains solid impurities; a fourth discharge path communicating with a lower part of the second reactor vessel and configured to discharge second desorption agent liquid passing treatment water from the lower part of the second reactor vessel, wherein the second desorption agent liquid passing treatment water contains solid impurities; a water passing mechanism configured to pass, through the adsorbent packed bed in each one of the first and second reactor vessels, the phosphorus desorption agent liquid which desorbs phosphorus from the phosphorus adsorbent which has adsorbed phosphorus; a first solid-liquid separation mechanism communicating with the third discharge path and the fourth discharge path and configured to separate the solid impurities from the first and second phosphorus desorption agent liquid passing treatment water; a crystallization vessel including a hydroxyapatite, into which the first phosphorus desorption agent liquid passing treatment water is introduced from the first reactor vessel via the third discharge path and the first solid-liquid separation mechanism, and into which the second phosphorus desorption agent liquid passing treatment water is introduced from the second reactor vessel via the fourth discharge path and the first solid-liquid separation mechanism; an agent liquid supply source configured to inject a crystallization agent liquid into the crystallization vessel; and a stirrer configured to mix the first and second phosphorus desorption agent liquid passing treatment water and the crystallization agent liquid with each other in the crystallization vessel in order to bring the first and second phosphorus desorption agent liquid passing treatment water into contact with the crystallization agent liquid, wherein the first solid-liquid separation mechanism communicates with the third and fourth discharge paths to receive the first and second desorption agent liquid passing treatment water and provide liquid from which the solid impurities have been separated to the crystallization vessel.