Boron removal device and boron removal method, and pure water production device and pure water production method

Patent metadata

Field	Value
Publication number	US-12338152-B2
Application number	US-202117925052-A
Country	US
Kind code	B2
Filing date	Mar 30, 2021
Priority date	May 20, 2020
Publication date	Jun 24, 2025
Grant date	Jun 24, 2025

Abstract

Provided are an apparatus for removing boron and a method for removing boron for reducing the boron concentration in water to be treated, and an apparatus and a method for producing pure water wherein the boron concentration is reduced. An apparatus for removing boron includes: a first electrodeionization device to which water to be treated is supplied; an ultraviolet oxidation device to which the water treated by the first electrodeionization device is supplied; an oxide removal device to which the water treated by the ultraviolet oxidation device is supplied; and a second electrodeionization device to which the water treated by the oxide removal device is supplied. A method for removing boron using the apparatus is provided. The oxide removal device is equipped with a platinum group metal catalyst, and the water that has been treated by the oxide removal device has a hydrogen peroxide concentration of less than 1 ppb.

First claim

The invention claimed is:

1. An apparatus for removing boron, comprising:
a first electrodeionization device to which water to be treated is supplied;
an ultraviolet oxidation device to which the water treated by the first electrodeionization device is supplied;
an oxide removal device to which the water treated by the ultraviolet oxidation device is supplied; and
a second electrodeionization device to which the water treated by the oxide removal device is supplied.

2. The apparatus for removing boron according to claim 1 , wherein the oxide removal device comprises a platinum group metal catalyst.

3. The apparatus for removing boron according to claim 1 , wherein
the oxide removal device comprises a platinum group metal catalyst that is supported on an anion exchanger, and
the hydrogen peroxide concentration of the water treated by the oxide removal device is less than 1 ppb.

4. An apparatus for producing pure water, comprising:
a first reverse osmosis membrane device to which water to be treated is supplied;
a pH adjusting device for adjusting the pH of permeated water from the first reverse osmosis membrane device;
a second reverse osmosis membrane device to which adjusted water in which the pH has been adjusted by the pH adjusting device is supplied;
a first electrodeionization device to which permeated water from the second reverse osmosis membrane device is supplied;
an ultraviolet oxidation device to which the water treated by the first electrodeionization device is supplied;
an oxide removal device to which the water treated by the ultraviolet oxidation device is supplied;
a second electrodeionization device to which the water treated by the oxide removal device is supplied; and
a cartridge polisher to which the water treated by the second electrodeionization device is supplied.

5. The apparatus for producing pure water according to claim 4 ,
further comprising a pump for the supplying the adjusted water to the second reverse osmosis membrane device;
wherein the pH of the permeated water is adjusted to from 5.0 to 9.0 by the pH adjusting device.

6. The apparatus for producing pure water according to claim 4 , wherein the oxide removal device comprises a platinum group metal catalyst.

7. A method for removing boron, comprising:
(a) supplying water to be treated to a first electrodeionization device for treatment;
(b) supplying the treated water from the first electrodeionization device to an ultraviolet oxidation device for treatment;
(c) removing oxide by supplying the treated water from the ultraviolet oxidation device to an oxide removal device; and
(d) supplying the treated water from the oxide removal device to a second electrodeionization device for treatment.

8. The method according to claim 7 , wherein the removal of the oxide is performed by a platinum group metal catalyst.

9. The method according to claim 7 , wherein during the removal of the oxide, the oxide is removed such that the hydrogen peroxide concentration is less than 1 ppb.

10. A method for producing pure water comprising:
(a) supplying water to be treated to a first reverse osmosis membrane device for treatment;
(b) supplying permeated water from the first reverse osmosis membrane device to a pH adjusting device to adjust the pH;
(c) supplying adjusted water in which the pH has been adjusted by the pH adjusting device to a second reverse osmosis membrane device for treatment;
(d) supplying permeated water from the second reverse osmosis membrane device to a first electrodeionization device for treatment;
(e) supplying the treated water from the first electrodeionization device to an ultraviolet oxidation device for treatment;
(f) removing oxide by supplying the treated water from the ultraviolet oxidation device to an oxide removal device;
(g) supplying the treated water from the oxide removal device to a second electrodeionization device for treatment; and
(h) supplying the treated water from the second electrodeionization device to a cartridge polisher for treatment.

11. The method according to claim 10 , wherein during the supplying of permeated water, the pH of the permeated water is adjusted to from 5.0 to 9.0.

12. The method according to claim 10 , wherein during the removing of the oxide, a catalyst used to remove the oxide is a platinum group metal catalyst.

Assignees

• Organo Corp

Inventors

• Takahashi Kazushige
• Sudo Fumio
• Nakamura Yuki
• Shibasaki Kenji
• Sasaki Keisuke

Classifications

• C02F2301/08

  Multistage treatments, e.g. repetition of the same process step under different conditions · CPC title

• C02F2101/108

  Boron compounds · CPC title

• C02F1/705

  Reduction by metals · CPC title

• C02F1/66

  by neutralisation; pH adjustment (for degassing C02F1/20; using ion-exchange C02F1/42; for flocculation or precipitation of suspended impurities C02F1/52; for removing dissolved compounds C02F1/58) · CPC title

• C02F1/4695

  electrodeionisation · CPC title