Method and apparatus for treating water containing boron

Patent metadata

Field	Value
Publication number	US-2016159671-A1
Application number	US-201414906419-A
Country	US
Kind code	A1
Filing date	Jun 25, 2014
Priority date	Jul 22, 2013
Publication date	Jun 9, 2016
Grant date	—

Abstract

A method and an apparatus for treating water containing boron that enable boron to be removed from water containing boron with efficiency by using an RO device and an ion-exchange device in the acidic to neutral pH range in which an RO film has high resistance to degradation are provided. A method for treating water containing boron, comprising: a step in which water containing boron is passed through a high-pressure reverse osmosis membrane device; and a step in which the water passed through the device is subsequently treated by an ion-exchange device. An apparatus for treating water containing boron comprising: a high-pressure reverse osmosis membrane device into which water containing boron is fed; and an ion-exchange device through which water that permeated through the high-pressure reverse osmosis membrane device is passed.

First claim

1 . A method for treating water containing boron, comprising:
a step in which water containing boron is passed through a high-pressure reverse osmosis membrane device; and a step in which the water passed through the device is subsequently treated by an ion-exchange device.

2 . The method for treating water containing boron according to claim 1 , wherein the ion-exchange device includes any one of regenerative ion-exchange devices described in a) to e) below,
a) a single-bed, single-tower regenerative ion-exchange device packed with a strongly basic anion-exchange resin, b) a two-bed, two-tower regenerative ion-exchange device including a cation-exchange resin tower packed with a strongly acidic cation-exchange resin and an anion-exchange resin tower packed with a strongly basic anion-exchange resin, the cation-exchange resin tower and the anion-exchange resin tower being connected to each other in series, c) a two-bed, one-tower regenerative ion-exchange device including one ion-exchange resin tower in which a strongly acidic cation-exchange resin and a strongly basic anion-exchange resin are arranged to form independent layers, d) a mixed-bed regenerative ion-exchange device including one tower packed with a strongly acidic cation-exchange resin and a strongly basic anion-exchange resin that are uniformly mixed together, and e) a regenerative ion-exchange device including one or more electric regenerative deionizing apparatus connected to one another in series.

3 . The method for treating water containing boron according to claim 1 , wherein the water containing boron is subjected to a coagulation treatment and a filtration treatment prior to being fed to the high-pressure reverse osmosis membrane device.

4 . The method for treating water containing boron according to claim 1 , wherein water fed to the high-pressure reverse osmosis membrane device has a pH of 5 to 8.

5 . An apparatus for treating water containing boron comprising:
a high-pressure reverse osmosis membrane device into which water containing boron is fed; and an ion-exchange device through which water that permeated through the high-pressure reverse osmosis membrane device is passed.

6 . The apparatus for treating water containing boron according to claim 5 , wherein the ion-exchange device includes any one of regenerative ion-exchange devices described in a) to e) below,
a) a single-bed, single-tower regenerative ion-exchange device packed with a strongly basic anion-exchange resin, b) a two-bed, two-tower regenerative ion-exchange device including a cation-exchange resin tower packed with a strongly acidic cation-exchange resin and an anion-exchange resin tower packed with a strongly basic anion-exchange resin, the cation-exchange resin tower and the anion-exchange resin tower being connected to each other in series, c) a two-bed, one-tower regenerative ion-exchange device including one ion-exchange resin tower in which a strongly acidic cation-exchange resin and a strongly basic anion-exchange resin are arranged to form independent layers, d) a mixed-bed regenerative ion-exchange device including one tower packed with a strongly acidic cation-exchange resin and a strongly basic anion-exchange resin that are uniformly mixed together, and e) a regenerative ion-exchange device including one or more electric regenerative deionizing apparatus connected to one another in series.

7 . The apparatus for treating water containing boron according to claim 5 , the apparatus comprising a coagulation treatment device and a filtration device disposed upstream of the high-pressure reverse osmosis membrane device.

Assignees

• Kurita Water Ind Ltd

Inventors

• Ikuno Nozomu

Classifications

• C02F1/32

  with ultraviolet light · CPC title

• B01D61/58

  Multistep processes · CPC title

• C02F1/444

  by ultrafiltration or microfiltration · CPC title

• B01D61/025

  Reverse osmosis; Hyperfiltration · CPC title

• C02F2001/425

  using cation exchangers · CPC title