Water-Purifying Agent and Water Purification Method

Abstract

Provided is a water-purifying agent formed of a granulated product including a mixture of a plant powder and a polymeric flocculant, wherein a surface of the granulated product includes a coated portion in which the plant powder is coated with the polymeric flocculant and a non-coated portion in which the plant powder is not coated with the polymeric flocculant.

1 . A water-purifying agent, comprising:
 a granulated product that comprises a mixture of a plant powder and a polymeric flocculant,   wherein a surface of the granulated product comprises a coated portion in which the plant powder is coated with the polymeric flocculant and a non-coated portion in which the plant powder is not coated with the polymeric flocculant.   
     
     
         2 . The water-purifying agent according to  claim 1 ,
 wherein a ratio of an area of the coated portion to a total of the area of the coated portion and an area of the non-coated portion is from 10% through 90%.   
     
     
         3 . The water-purifying agent according to  claim 1 ,
 wherein a ratio of an area of the coated portion to a total of the area of the coated portion and an area of the non-coated portion is from 30% through 70%.   
     
     
         4 . The water-purifying agent according to  claim 1 ,
 wherein the plant powder is of any one of Corchorus olitorius, mulukhiya, Japanese mustard spinach, Japanese honewort, potherb mustard, and spinach.   
     
     
         5 . The water-purifying agent according to  claim 4 ,
 wherein the plant powder is of Corchorus olitorius.   
     
     
         6 . The water-purifying agent according to  claim 4 ,
 wherein the Corchorus olitorius is “intermediate jute No. 4” under 2013, which is an identification number in Institute of Bast Fiber Crops, Chinese Academy of Agricultural Sciences.   
     
     
         7 . The water-purifying agent according to  claim 1 ,
 wherein a median diameter of the water-purifying agent is 150 micrometers or greater.   
     
     
         8 . The water-purifying agent according to  claim 1 ,
 wherein the polymeric flocculant is a polyacrylamide.   
     
     
         9 . The water-purifying agent according to  claim 1 ,
 wherein the water-purifying agent is produced by a producing method that comprises: mixing the plant powder and the polymeric flocculant and kneading the plant powder and the polymeric flocculant with addition of moisture, to obtain a kneaded product; shaping the kneaded product into a sheet shape by a stretching method, to obtain a sheet-shaped shaped product; drying the sheet-shaped shaped product, to obtain a dried sheet; and pulverizing the dried sheet.   
     
     
         10 . A water purification method, comprising:
 dissolving the water-purifying agent according to  claim 1  in water to obtain a dispersion liquid of the plant powder and the polymeric flocculant, and feeding the dispersion liquid to wastewater including an inorganic unnecessary substance to remove the inorganic unnecessary substance in the wastewater.   
     
     
         11 . The water purification method according to  claim 10 ,
 wherein the wastewater is wastewater including the inorganic unnecessary substance that contains at least any one of nickel, fluorine, iron, copper, zinc, chromium, arsenic, cadmium, tin, and lead.   
     
     
         12 . The water purification method according to  claim 11 , comprising
 feeding the dispersion liquid to the wastewater after subjecting at least any one of inorganic ions selected from the group consisting of a nickel ion, a fluorine ion, an iron ion, a copper ion, a zinc ion, a chromium ion, an arsenic ion, a cadmium ion, a tin ion, and a lead ion contained in the inorganic unnecessary substance to an insolubilizing treatment.