JP2011092803A - Water processing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a water processing device which can effectively use a concentrate separated by a reverse osmosis membrane. <P>SOLUTION: In the water processing device 1 equipped with a purification unit 4 provided with an ion trap unit 3 for capturing ions in raw water by bringing the raw water into contact with an ion exchange resin 3a, the ion exchange resin 3a of the purification unit 4 is regenerated using a concentrate separated by a reverse osmosis membrane device 2. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a water treatment apparatus.

  Conventionally, as a water treatment apparatus, one that filters raw water using a reverse osmosis membrane is known (for example, see Patent Document 1).

  In Patent Document 1, water treatment is performed by passing tap water through a precipitation filter, passing through a first adsorption filter and a reverse osmosis membrane filter, passing through a tank, and then passing through a second adsorption filter and a ceramic filter. ing.

Japanese Patent No. 4040077

  However, in such a conventional water treatment apparatus using a reverse osmosis membrane, the concentrated water separated by the reverse osmosis membrane has been discarded.

  Then, an object of this invention is to obtain the water treatment apparatus which can utilize effectively the concentrated water isolate | separated with the reverse osmosis membrane.

  In the first aspect of the invention, in the water treatment apparatus including a purification unit provided with an ion capturing unit that captures ions in the raw water by bringing the raw water into contact with the ion exchange resin, the ion exchange resin of the purification unit Is regenerated using concentrated water separated by a reverse osmosis membrane device.

  In the invention of claim 2, in the water treatment device of claim 1, the purified water generated by the reverse osmosis membrane device and the purified water generated by the purification unit can be selectively supplied. A switching unit is provided, and purified water generated by the reverse osmosis membrane device is supplied during regeneration of the ion exchange resin.

  According to a third aspect of the present invention, in the water treatment device according to the first or second aspect, the purification unit is provided with a filtration unit in which activated carbon is disposed, and the water treatment unit is provided with the filtration unit. A heating unit is provided for heating the concentrated water that flows in.

  According to a fourth aspect of the present invention, in the water treatment device according to the third aspect, the filtration unit is arranged upstream of the ion trapping unit in the inflow direction of the concentrated water.

  According to a fifth aspect of the present invention, in the water treatment apparatus according to the first or second aspect, the purification unit is provided with a filtration unit in which activated carbon is disposed, and the filtration unit is provided in the water treatment unit. A heating unit for heating is provided.

  According to the invention of claim 1, since the ion exchange resin is regenerated using the concentrated water separated by the reverse osmosis membrane device, the concentrated water that is normally discarded can be effectively used.

  According to the invention of claim 2, since the purified water produced by the reverse osmosis membrane device by the switching unit and the purified water produced by the purification unit can be selectively supplied, the reverse osmosis membrane is used during the regeneration of the ion exchange resin. The device can be supplied with clean water. As a result, it becomes possible to regenerate the ion exchange resin without stopping the water supply of the water treatment apparatus.

  According to the third aspect of the present invention, by providing the purification unit with the filtration unit in which the activated carbon is arranged, impurities can be adsorbed and removed by the activated carbon, and the purification capability of the water treatment apparatus can be further improved. And by flowing the concentrated water heated by the heating part into the filtration part, the chlorinated organic compound adsorbed on the activated carbon can be separated and the activated carbon can be efficiently regenerated. As a result, it becomes possible to extend the life of the activated carbon. In this way, by heating the concentrated water and allowing it to flow into the purification section, it is possible to regenerate the ion exchange resin and effectively regenerate the activated carbon.

  According to the fourth aspect of the present invention, the heated concentrated water is caused to flow into the filtration part before the ion trapping part by disposing the filtration part upstream of the ion trapping part in the concentrated water inflow direction. Can do. By arranging in this way, the concentrated water that has flowed into the ion trapping part and the water temperature has been lowered is not allowed to flow into the filtering part, so that the regeneration efficiency of activated carbon can be increased with concentrated hot water. It becomes like this.

  According to the fifth aspect of the present invention, by providing the purification unit with the filtration unit in which the activated carbon is disposed, impurities can be adsorbed and removed by the activated carbon, and the purification capability of the water treatment apparatus can be further improved. Furthermore, by providing the heating unit for heating the filtration unit, the filtration unit can be directly heated, so that the heating efficiency of the activated carbon is improved, and as a result, the regeneration of the activated carbon can be further promoted.

FIG. 1 is a schematic view of a water treatment apparatus according to the first embodiment of the present invention. FIG. 2 is a schematic view of a water treatment apparatus according to the second embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that similar components are included in the following embodiments. Therefore, in the following, common reference numerals are given to those similar components, and redundant description is omitted.

(First embodiment)
The water treatment device 1 according to the present embodiment includes a reverse osmosis membrane device 2 that separates water containing salt such as seawater into purified water (permeated water) and concentrated water containing impurities (salts such as NaCl). And a purification unit 4 provided with an ion exchange resin layer (ion capturing unit) 3 that captures ions in the raw water by bringing the raw water into contact with the ion exchange resin 3a.

  In the present embodiment, as the reverse osmosis membrane device 2, a known device having a reverse osmosis membrane provided therein is used. As this reverse osmosis membrane, a generally known RO membrane (Reverse Osmosis Menbrane), an NF membrane (Nanofiltration Membrane) called a nanofilter, or the like can be used. The reverse osmosis membrane is not limited to the RO membrane and the NF membrane as long as it has a property of permeating water and not permeating impurities other than water such as ions and salts.

  The reverse osmosis membrane device 2 includes a supply port 2a for supplying salt-containing water to the inside, a purified water discharge port 2b for discharging purified water from which impurities have been removed through the reverse osmosis membrane, and a reverse osmosis membrane. A concentrated water discharge 2c is formed to discharge concentrated water containing impurities that have not permeated. That is, water flowing into the reverse osmosis membrane device 2 from the supply port 2a passes through the reverse osmosis membrane and is discharged from the purified water discharge port 2b, and discharged from the concentrated water discharge 2c without passing through the reverse osmosis membrane. And concentrated water containing impurities.

  As the ion exchange resin 3a forming the ion exchange resin layer 3, a cation exchange resin, an anion exchange resin, or the like can be used, and various types of ion exchange resins are used depending on the substance to be removed. be able to. In this embodiment, in order to increase the contact area between the ion exchange resin 3a and the raw water, the ion exchange resin layer 3 is formed using the granular ion exchange resin 3a. Purified water is generated by passing raw water through the purification section 4 provided with the ion exchange resin layer 3.

  And in this embodiment, the reverse osmosis membrane apparatus 2 and the purification | cleaning part 4 are arrange | positioned in a mutually parallel relationship, and salt concentration, such as seawater, is provided in the reverse osmosis membrane apparatus 2 via the piping P1 which has the on-off valve V1. Water is introduced from a storage tank 5 in which water containing water is stored. The water in the storage tank 5 is supplied into the reverse osmosis membrane device 2 via a supply pump (not shown). And the purified water produced | generated by the reverse osmosis membrane apparatus 2 is supplied to the piping P0 via the three-way valve (switching part) V2 via the piping P2. The pipe P0 is connected to a faucet or the like, and purified water is supplied through the faucet or the like.

  Further, raw water such as tap water is introduced into the purification unit 4 through the pipe P3, and ions in the raw water are removed and purified by the ion exchange resin layer 3. The purified water thus purified is supplied to the pipe P0 via the pipe P4 and the three-way valve V2 described above. At this time, by switching the three-way valve V2, it is possible to select whether the pipe communicating with the pipe P0 is P2 or P4. That is, the three-way valve V2 can selectively supply purified water generated by the reverse osmosis membrane device 2 and purified water generated by the purification unit 4 to the pipe P0 (so that either one of the purified water can be obtained). Yes. Further, the purification unit 4 is provided with a drain pipe P5 that discharges the internal drain water to the outside, and the drain pipe P5 is provided with an on-off valve V3.

  Here, in the present embodiment, a pipe P6 for allowing the concentrated water separated by the reverse osmosis membrane device 2 to flow into the purification unit 4 is provided, and the concentrated water is used for the regeneration of the ion exchange resin. Specifically, the concentrated water discharge port 2c of the reverse osmosis membrane device 2 and the above-described pipe P3 are communicated with each other by a pipe P6, and a three-way valve V4 is provided at a communicating portion with the pipe P3. Then, the concentrated water can be introduced into the purification unit 4 by switching the three-way valve V4 to the side where the pipe P6 and the pipe P3 are communicated. At this time, the path for supplying the concentrated water to the purification unit 4 is the pipe P6, the three-way valve V4, and the pipe P3.

  Next, operations during normal operation and regeneration operation of the water treatment apparatus 1 according to the present embodiment will be described.

  First, during normal operation, with the on-off valves V1 and V3 closed, one of the three-way valves V2 is switched to the side where the pipe P4 communicates with the pipe P0, and the other three-way valve V4 is connected to the pipe P3. And switching to the side that shuts off the pipe P6. Then, the raw water flows into the purification unit 4 through the pipe P3, and the purified water ion-exchanged in the ion exchange resin layer 3 of the purification unit 4 is supplied from the pipe P4 to the pipe P0.

  On the other hand, during the regeneration operation of the ion exchange resin, with the on-off valves V1 and V3 opened, one of the three-way valves V2 is switched to the side where the pipe P2 communicates with the pipe P0, and the other three-way valve V4 is switched on. Then, the pipe P6 is switched to the side communicating with the pipe P3. Then, the water in the storage tank 5 flows into the reverse osmosis membrane device 2 through a pump (not shown). The purified water from which impurities such as NaCl have been removed through the reverse osmosis membrane of the reverse osmosis membrane device 2 is supplied to the pipe P0 via the pipe P2 and the three-way valve V2. Further, the concentrated water separated by the reverse osmosis membrane device 2 (without passing through the reverse osmosis membrane) flows into the purification unit 4 via the pipe P6, the three-way valve V4 and the pipe P3, and fills the purification unit 4. Later, it will be discharged outward from the drain pipe P5.

  Thus, during the regeneration operation, the purification unit 4 is filled with the concentrated water, and the ion exchange resin layer 3 is immersed in the concentrated water. Then, the ion exchange resin is regenerated by the salinity contained in the concentrated water. At this time, the drain pipe P5 communicates with the purification unit 4 at the upper part of the purification unit 4 in order to fill the purification unit 4 with concentrated water. A pipe P <b> 3 that supplies concentrated water to the purification unit 4 is communicated with the purification unit 4 at a lower part of the purification unit 4.

  Thus, in the water treatment apparatus 1 of the present embodiment, the supply of purified water generated by the purification unit 4 is stopped during the regeneration of the ion exchange resin, but reverse osmosis is performed while the purification unit 4 is stopped. Since the purified water produced | generated by the membrane apparatus 2 can be supplied to distribution P0, either purified water can be supplied now to the piping P0. That is, in this embodiment, the water treatment apparatus 1 is always ready to supply purified water.

  Furthermore, in this embodiment, the purification unit 4 in which the ion exchange resin layer 3 is stored includes an activated carbon layer (a filtration unit in which activated carbon is disposed) 6 in addition to the ion exchange resin layer 3. Thus, by providing the activated carbon layer 6 and flowing the raw water into the activated carbon layer 6, residual chlorine, trihalomethane, mold odor and the like in the raw water can be adsorbed and removed by the activated carbon. In addition, the water treatment device 1 is provided with a heating unit 7 that heats the concentrated water flowing into the purification unit 4.

  In this embodiment, the heating part 7 is comprised by incorporating an electric heater etc., and is provided in the middle of the piping P6 which supplies concentrated water to the piping P3. And the concentrated water which passes the piping P6 by this heating part 7 is heated.

  Moreover, although the ion exchange resin layer 3 and the activated carbon layer 6 will be accommodated in the purification | cleaning part 4, in this embodiment, the activated carbon layer 6 is upstream from the ion exchange resin layer 3 in the flow direction of concentrated water. (Lower side in FIG. 1).

  As described above, according to the present embodiment, the concentrated water separated by the reverse osmosis membrane device 2 is stored in the ion exchange resin layer (ion trapping part) 3 through the pipe P6, the three-way valve V4, and the pipe P3. It is made to flow into the purification unit 4. Thereby, it becomes possible to immerse the ion exchange resin layer (ion trapping part) 3 in the purification unit 4 with concentrated water containing salt, and the ion exchange resin can be regenerated by the salt contained in the concentrated water. It becomes like this. That is, according to the present embodiment, the concentrated water that is normally discarded can be effectively used. Further, by effectively using the concentrated water that is normally discarded, there is an advantage that labor and cost are not required for regeneration of the ion exchange resin.

  In addition, according to the present embodiment, the three-way valve (switching unit) V2 can selectively supply the purified water generated by the reverse osmosis membrane device 2 and the purified water generated by the purification unit 4. The purified water of the reverse osmosis membrane device 2 can be supplied during the regeneration of the ion exchange resin. As a result, it is possible to regenerate the ion exchange resin without stopping the water supply of the water treatment apparatus 1.

  Moreover, according to this embodiment, by providing the purification unit 4 with the activated carbon layer (filtering unit) 6 in which activated carbon is arranged, impurities in the raw water can be adsorbed and removed by the activated carbon, and the water treatment apparatus 1 The purification ability can be further improved. And by flowing the concentrated water heated by the heating unit 7 into the activated carbon layer (filtering unit) 6, the chlorine-based organic compound adsorbed on the activated carbon can be separated, and the activated carbon can be efficiently regenerated. it can. As a result, it becomes possible to extend the life of the activated carbon. In this way, by heating the concentrated water and allowing it to flow into the purification section, it is possible to regenerate the ion exchange resin and effectively regenerate the activated carbon.

  Furthermore, according to this embodiment, when the ion exchange resin layer 3 and the activated carbon layer 6 are accommodated in the purification unit 4, the activated carbon layer 6 is disposed upstream of the ion exchange resin layer 3 in the flow direction of the concentrated water. Thus, the heated concentrated water can flow into the activated carbon layer 6 before the ion exchange resin layer 3. As described above, the activated carbon layer 6 is arranged on the upstream side of the ion exchange resin layer 3 in the direction in which the concentrated water flows, so that the concentrated water that has flowed into the ion exchange resin layer 3 and the water temperature has decreased is activated carbon layer. Therefore, the regeneration efficiency of the activated carbon can be increased with concentrated water having a high temperature.

  In the present embodiment, the heating unit 7 is provided in the pipe P6 to heat the concentrated water passing through the pipe P6. However, the present invention is not limited to this, and water before passing through the reverse osmosis membrane device 2 is used. That is, the raw water in the raw water storage tank 5 and the pipe P1 may be heated. Moreover, you may make it heat the reverse osmosis membrane apparatus 2 itself. In this case, the reverse osmosis membrane in the reverse osmosis membrane device 2 is preferably a high temperature type (for example, capable of withstanding up to about 80 ° C.).

(Second Embodiment)
1 A of water treatment apparatuses concerning this embodiment are provided with the reverse osmosis membrane apparatus 2, the ion exchange resin layer 3, the purification | cleaning part 4 which accommodated the activated carbon layer 6, and the raw | natural water storage tank 5 similarly to the said 1st Embodiment. Yes. The operations of the on-off valves V1, V3 and the three-way valves V2, V4 are the same as in the first embodiment.

  Here, the main difference between the water treatment device 1A of the present embodiment and the water treatment device 1 of the first embodiment is that the activated carbon layer (filtering unit) 6 is directly heated by the heating unit 7A. It is in. That is, the heating unit 7A is configured by an electric heater or the like as in the first embodiment, but the heating unit 7A is not provided in the pipe P6, but surrounds the outer periphery of the activated carbon layer (filtering unit) 6. Provided. In this embodiment, the heating unit 7A is provided so as to surround the outer periphery of the purification unit 4, but the heating unit 7A may be provided so as to surround only the outer periphery of the activated carbon layer (filtering unit) 6.

  Also according to this embodiment described above, the same operational effects as those of the first embodiment can be obtained.

  Moreover, according to this embodiment, since the activated carbon layer (filter part) 6 can be directly heated by providing the heating part 7A for heating the activated carbon layer (filter part) 6, the heating efficiency of the activated carbon is improved. As a result, the regeneration of the activated carbon can be further promoted. Further, since it is not necessary to heat the concentrated water itself, it is not necessary to use a pipe or a reverse osmosis membrane as a heat-resistant member, and the manufacturing cost of the water treatment apparatus can be reduced.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiments, and various modifications can be made.

  For example, in each of the above embodiments, the water treatment device is exemplified by a device provided with a reverse osmosis membrane device and a purification unit, but in addition to these, various filters and additives having a water treatment function are provided. May be.

  Moreover, although the thing provided with the filtration part was illustrated as a purification | cleaning part, the filtration part does not need to be provided.

  Moreover, in each said embodiment, although the structure which discharges the purified water produced | generated by the reverse osmosis membrane apparatus and the purified water produced | generated by the purification | cleaning part from the same faucet etc. was illustrated, the purified water produced | generated by each was discharged from a separate faucet etc. You may make it make it.

  Moreover, you may make it make the concentrated water isolate | separated with the reverse osmosis membrane apparatus flow into a purification | cleaning part. That is, you may comprise the water treatment apparatus which can reproduce | regenerate ion-exchange resin using the concentrated water of the reverse osmosis membrane apparatus used for another use.

  The water stored in the storage tank may be seawater, or salt water may be produced in advance and the salt water may be stored in the storage tank.

  Moreover, in each said embodiment, although what supplied the water in a storage tank to a reverse osmosis membrane apparatus via a supply pump was illustrated, water was enclosed with the compression body in the storage tank, and the inside of a storage tank Water may be supplied to the reverse osmosis membrane device using the pressure of

  In addition, the reverse osmosis membrane device, the water purification unit, the heating unit, and other detailed specifications (shape, size, layout, etc.) can be changed as appropriate.

1, 1A Water treatment device 2 Reverse osmosis membrane device 3 Ion exchange resin layer (ion capture part)
4 Purification section 6 Activated carbon layer (filtration section)
7, 7A Heating part V2 Three-way valve (switching part)

Claims (5)

In a water treatment apparatus provided with a purification unit provided with an ion capturing unit that captures ions in the raw water by bringing the raw water into contact with an ion exchange resin,
A water treatment apparatus characterized in that the ion exchange resin in the purification section is regenerated using concentrated water separated by a reverse osmosis membrane apparatus.   Provided with a switching unit that can selectively supply purified water generated by the reverse osmosis membrane device and purified water generated by the purification unit, purified water generated by the reverse osmosis membrane device during regeneration of the ion exchange resin The water treatment apparatus according to claim 1, wherein water is supplied.   3. The purifying unit is provided with a filtration unit in which activated carbon is disposed, and the water treatment device is provided with a heating unit that heats concentrated water flowing into the filtration unit. The water treatment apparatus as described.   The water treatment device according to claim 3, wherein the filtration unit is disposed upstream of the ion trapping unit in the inflow direction of the concentrated water.   The water treatment device according to claim 1, wherein a filtration unit in which activated carbon is disposed is provided in the purification unit, and a heating unit that heats the filtration unit is provided in the water treatment device. .

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