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