# US 11,078,095 B2 · Water purification agent and water purification method

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- Number: US 11,078,095 B2
- Document ID: US11078095B2
- Status: Granted
- Kind: B2
- Application number: 16/560,473
- Filed: 2019-09-04
- Published: 2019-12-26
- Granted: 2021-08-03
- Earliest claimed: 2014-10-03
- Assignees: Dexerials Corporation
- Applicants: Dexerials Corporation
- Inventors: Kazuhiro Kimura; Koji Hirata
- Web page: https://patentgrep.com/patent/US11078095B2

## CPC

- B03D 3/00: Differential sedimentation
- C02F 1/56: Macromolecular compounds
- B01D 21/01: using flocculating agents (for purifying water C02F1/52; for liquid radioactive waste G21F9/10)
- C02F 1/5272: {using specific organic precipitants}
- C08L 33/26: Homopolymers or copolymers of acrylamide or methacrylamide
- C02F 2101/20: Heavy metals or heavy metal compounds
- B03D: FLOTATION; DIFFERENTIAL SEDIMENTATION (sedimentation in general B01D21/00; in combination with other separation of solids B03B; sink-float separation B03B5/28; detergents, soaps C11D)
- C02F: TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE (separation in general B01D; special arrangements on waterborne vessels of installations for treating water, waste water or sewage, e.g. for producing fresh water, B63J; adding materials to water to prevent corrosion C23F; treating radioactively-contaminated liquids G21F9/04; regeneration of reactants for recirculation into processes, see the relevant places for the processes)
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## 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.

## Claims

### Claim 1

A water purification method, comprising:
obtaining the water purification agent by:
a) grinding a dried plant to obtain a plant powder having a number average particle diameter of 250 μm or less; and
b) mixing the plant powder with a 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;
wherein the water purification agent comprises the granulated product,
wherein the granulated product comprises a mixture of the plant powder and the polymer coagulant,
obtaining a dispersion liquid in which the plant powder and the polymer coagulant are dispersed in an automated supplying machine, and
feeding the dispersion liquid to wastewater to remove an unnecessary inorganic substance in the wastewater in an automated purification device;
wherein a bulk specific gravity of the water purification agent is 0.4 g/cm3 or greater; and
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.

### Claim 2 (depends on 1)

The water purification method according to claim 1,
wherein a plant of the plant powder is at least any one of Corchorus olitorius and mulukhiya.

### Claim 3 (depends on 1)

The water purification method according to claim 1,
wherein the polymer coagulant is a polyacrylamide.

### Claim 4 (depends on 1)

The water purification method 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).