Apparatus for removing boron, method for removing boron, apparatus for producing pure water and method for producing pure water

An apparatus for producing pure water, comprising:

• a low-pressure reverse osmosis membrane apparatus which is supplied with a water to be treated,
• a pH adjustment apparatus configured to adjust a pH of a permeated water from the low-pressure reverse osmosis membrane apparatus to 5.0 to 9.0,
• a high-pressure reverse osmosis membrane apparatus which is supplied with an adjustment water that has an adjusted pH from the pH adjustment apparatus,
• an electrodeionization apparatus which is supplied with a permeated water from the high-pressure reverse osmosis membrane apparatus,
• an ultraviolet oxidation apparatus to which is supplied with a water treated by the electrodeionization apparatus,
• a cartridge polisher to which is supplied with a water treated by the ultraviolet oxidation apparatus,
• a pump provided downstream from the pH adjustment apparatus and configured to pump the adjustment water that has the adjusted pH to the high-pressure reverse osmosis membrane apparatus, and
• a degassing membrane device positioned downstream of the high-pressure reverse osmosis membrane apparatus and directly upstream of the electrodeionization apparatus,
• wherein the pH adjustment apparatus is positioned directly downstream from the low-pressure reverse osmosis membrane apparatus and directly upstream from the pump, and the pump is positioned directly upstream from the high-pressure reverse osmosis membrane apparatus.

A method for removing boron comprising:

• (a) supplying a water to be treated to a low-pressure reverse osmosis membrane apparatus,
• (b) supplying the permeate water from the low-pressure reverse osmosis membrane apparatus to a pH adjustment apparatus to adjust the pH to 5.0-9.0,
• (c) supplying a permeated water that has an adjusted pH from the pH adjustment apparatus to a high-pressure reverse osmosis membrane apparatus via a pump, and treating it, and
• (d) supplying the permeated water from the high-pressure reverse osmosis membrane apparatus to a degassing membrane device, and then directly to an electrodeionization apparatus and treating it,
• wherein the pH adjustment apparatus is positioned directly downstream from the low-pressure reverse osmosis membrane apparatus and directly upstream from the pump, and the pump is positioned directly upstream from the high-pressure reverse osmosis membrane apparatus.

A method for producing pure water comprising:

• (a) supplying a water to be treated to a low-pressure reverse osmosis membrane apparatus,
• (b) supplying the permeate water from the low-pressure reverse osmosis membrane apparatus to a pH adjustment apparatus to adjust the pH to 5.0-9.0,
• (c) supplying a permeated water that has an adjusted pH from the pH adjustment apparatus to a high-pressure reverse osmosis membrane apparatus via a pump, and treating it,
• (d) supplying the permeated water from the high-pressure reverse osmosis membrane apparatus to a degassing membrane device, and then directly to an electrodeionization apparatus and treating it,
• (e) supplying a water from the electrodeionization apparatus to an ultraviolet oxidation apparatus and removing organic substances, and
• (f) supplying the water from which the organic substance has been removed to a cartridge polisher, treating the water from which the organic substance—has substances have been removed by ion exchange, and taking out pure water,
• wherein the pH adjustment apparatus is positioned directly downstream from the low-pressure reverse osmosis membrane apparatus and directly upstream from the pump, and the pump is positioned directly upstream from the high-pressure reverse osmosis membrane apparatus.