Water Purification Agent and Water Purification Method

Abstract

[Solution] Provided is a water purification agent suitable for use in an automated purification treatment device, when a wastewater purification treatment using a plant-derived water purification agent is performed with the automated purification treatment device. The water purification agent is a granulated product containing a mixture of a plant powder and a polymer coagulant.

1 . A water purification agent, comprising:
 a granulated product,   wherein the granulated product comprises a mixture of a plant powder and a polymer coagulant.   
     
     
         2 . The water purification agent according to  claim 1 ,
 wherein a plant of the plant powder is at least any one of Corchorus olitorius and mulukhiya.   
     
     
         3 . The water purification agent according to  claim 1 ,
 wherein the polymer coagulant is a polyacrylamide.   
     
     
         4 . The water purification agent according to  claim 1 ,
 wherein a bulk specific gravity of the water purification agent is 0.4 g/cm 3  or greater.   
     
     
         5 . The water purification agent according to  claim 4 ,
 wherein variation of the bulk specific gravity of the water purification agent is 4.5% or less, where the variation is a ratio of a difference between a maximum and a minimum of the bulk specific gravity to the minimum of the bulk specific gravity.   
     
     
         6 . The water purification agent according to  claim 1 ,
 wherein a content ratio between the plant powder and the polymer coagulant in the water purification agent is from 1/1 through 9/1 on a basis of a mass ratio (plant powder/polymer coagulant).   
     
     
         7 . The water purification agent according to  claim 1 ,
 wherein the water purification agent is produced by a producing method that comprises:
 grinding a dried plant to obtain the plant powder having a number average particle diameter of 250 μm or less; and 
 mixing the plant powder with the polymer coagulant, adding water to the plant powder and the polymer coagulant, kneading the plant powder and the polymer coagulant, and subjecting a resultant to extrusion granulation to obtain the granulated product. 
   
     
     
         8 . A water purification method, comprising:
 dissolving the water purification agent according to  claim 1  in water to obtain a dispersion liquid in which the plant powder and the polymer coagulant are dispersed, and feeding the dispersion liquid to wastewater to remove an unnecessary inorganic substance in the wastewater.