JPH10258279A - Water purifying device and cooling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To purify cooling water simultaneously while cooling a body to be cooled by the cooling water. SOLUTION: Cooling water supplied into a body A to be cooled through a supply line 3 is passed through a recovering line 4 and stored in a first storage tank 6 of a purifying device 2, and also introduced into an anode chamber 9 of an electrolytic cell 5. At that time, electrolyte containing chloride is electrolyzed on the side of a cathode chamber 10 disposed across a diaphragm 8. Free chlorine is generated in the anode chamber 9 by the arrangement to sterilize the cooling water. Also the cooling water on the side of the anode chamber 9 becomes acidic, while the electrolyte on the side of the cathode chamber 10 becomes alkaline. As a result, organic matters contained in the cooling water are oxidized to turn into insoluble matters and removed by a first filter tank 16 on a first filter line 15. On the other hand, an ion-like hardness component contained in the cooling water is moved from the anode chamber 9 into the cathode chamber 10 and turned into an insoluble hydroxide and removed by a second filter tank 26 on a second filter line 25.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a purification device and a cooling device, and more particularly to a water purification device and a cooling device using cooling water.

[0002]

2. Description of the Related Art In a cooling apparatus for cooling various factory equipment such as a chemical plant, cooling water is usually circulated through a target factory equipment. In the cooling water used in such a cooling device, ionic hardness components, for example, ions such as calcium contained in the water are gradually concentrated, and the concentration thereof starts to increase. As a result, such a hardness component adheres to the piping for circulating the cooling water,
The piping may be blocked or the cooling efficiency may be reduced.
Further, when cooling water is cooled using a cooling machine such as a cooling tower, the cooling water may come into contact with air and be contaminated with various bacteria.

For this reason, in the above-described cooling apparatus, it is necessary to periodically perform cooling water purification, that is, sterilization of the cooling water and removal of the hardness component. In this case, the sterilization of the cooling water is usually carried out by adding a chemical such as hypochlorous acid, and the removal of the hardness component is usually carried out by the addition of a chemical, ion exchange or blow water discharge. ing.

[0004] However, the above-mentioned purification process is complicated and the processing cost tends to be high. Therefore, the cooling water is rarely purified and reused, and is usually discarded to a wastewater treatment facility without purification. For this reason, in order to operate the above-mentioned factory equipment, a large amount of new cooling water is always required. In other words, it is difficult to stably and continuously operate factory equipment in a place or a region where a large amount of cooling water cannot be secured.

An object of the present invention is to purify water easily and inexpensively.

[0006] Another object of the present invention is to simultaneously and simply and inexpensively remove and disinfect hardness components in water.

It is still another object of the present invention to provide a cooling apparatus which can circulate cooling water to cool a body to be cooled and simultaneously purify the cooling water.

[0008]

A water purifying apparatus according to the present invention is for purifying water to be treated. This water purification apparatus includes an anode chamber having an anode and electrolytically treating water to be treated, a cathode chamber having a cathode and electrolytically treating an electrolyte containing chloride, and an anode chamber and a cathode chamber. Separating means having partitioning and permeability, voltage applying means for applying a voltage between the anode and the cathode, and treated water filtering means for filtering the treated water electrolytically treated in the anode chamber. It has.

In such a water purification apparatus, the electrolytic solution to be electrolyzed in the cathode chamber is, for example, water to be treated to which chloride has been added. In addition, the above-described water purification device includes, for example,
An electrolytic solution filtering means for filtering the electrolytic solution electrolytically treated in the cathode chamber is further provided.

Another water purifying apparatus according to the present invention is for purifying water to be treated. This water purification device includes a first storage tank for storing the water to be treated, a second storage tank for storing an electrolyte containing chloride, and an anode, and is provided for electrolytically treating the water to be treated. An anode chamber, a cathode chamber having a cathode and for electrolytically treating an electrolytic solution containing chloride, and an isolating means for partitioning the anode chamber and the cathode chamber and having permeability,
A voltage applying means for applying a voltage between the anode and the cathode, a first circulation path for circulating the water to be treated between the first storage tank and the anode chamber, and a branch from the first circulation path. A first filtration path, which has filtration means for filtering the electrolytically treated water to be treated and which has an end extending to the first storage tank, and the electrolyte between the second storage tank and the cathode chamber; A second circulation path for circulating the electrolyte solution, and a filtering means for filtering the electrolytic solution subjected to the electrolytic treatment, which is provided by branching from the second circulation path, and a second end of which extends to the second storage tank. And a filtration path.

In such a water purification apparatus, the electrolyte stored in the second storage tank is, for example, treated water to which chloride is added.

A cooling device according to the present invention is for cooling a cooled object by circulating cooling water through the cooled object. The cooling device is disposed between a supply path for supplying cooling water to the object to be cooled, a recovery path for collecting cooling water supplied to the object to be cooled, and the supply path and the recovery path. And a cooling water purifying device for purifying the cooling water from the recovery path and supplying the purified water to the supply path. Here, the cooling water purification device is provided with an anode and an anode chamber for electrolytically treating cooling water, a cathode and a cathode chamber for electrolytically treating an electrolyte containing chloride, an anode chamber and a cathode chamber. And a separating means having a permeability and a voltage applying means for applying a voltage between the anode and the cathode,
A filtering means for filtering the cooling water electrolytically treated in the anode chamber.

[0013]

In the water purification apparatus according to the present invention, when a voltage is applied between the anode and the cathode by the voltage applying means, the water to be treated in the anode chamber and the electrolytic solution in the cathode chamber are electrolyzed. At this time, chloride contained in the electrolyte in the cathode chamber is also electrolyzed at the same time, and chloride ions generated thereby pass through the isolation means and move into the anode chamber. In the anode chamber, chlorine ions from the cathode chamber become free chlorine. The water to be treated in the anode chamber is sterilized by the action of the free chlorine.

Further, by the above-described electrolysis, the water to be treated in the anode chamber becomes acidic, and the electrolytic solution in the cathode chamber becomes alkaline. As a result,
In the anode chamber, organic substances and the like dissolved in the water to be treated are oxidized and appear as insoluble substances. This insoluble matter is filtered by the treated water filtration means and removed from the treated water. On the other hand, the hardness components such as metal ions contained in the water to be treated in the anode chamber pass through the separating means and move into the cathode chamber, and the electrolyte there exhibits alkalinity as described above. Precipitates. As a result, metal ions are also removed from the water to be treated.

In another water purification apparatus according to the present invention, when a voltage is applied between the anode and the cathode by the voltage applying means, the water to be treated supplied into the anode chamber from the first storage tank via the first circulation path. The electrolyte supplied from the second storage tank into the cathode chamber via the second circulation path is electrolyzed. At this time, chloride contained in the electrolyte in the cathode chamber is also electrolyzed at the same time, and chloride ions generated thereby pass through the isolation means and move into the anode chamber. In the anode chamber, chlorine ions from the cathode chamber become free chlorine. The water to be treated in the anode chamber is sterilized by the action of the free chlorine. The water to be treated containing free chlorine generated in this way returns to the first storage tank via the first circulation path.

[0016] Further, by the above-described electrolysis, the water to be treated in the anode chamber becomes acidic, and at the same time, the electrolyte in the cathode chamber becomes alkaline. As a result,
In the anode chamber, organic substances and the like dissolved in the water to be treated are oxidized and appear as insoluble substances. The water to be treated containing such insolubles returns to the first storage tank via the first circulation path, and is subsequently filtered by the filtration means in the first filtration path to remove insolubles. The water to be treated from which insolubles have been removed returns to the first storage tank again.

On the other hand, the hardness components such as metal ions contained in the water to be treated in the anode chamber pass through the separating means and move into the cathode chamber, and the electrolytic solution therein becomes alkaline as described above. Precipitates as hydroxide. The electrolytic solution containing the precipitated hydroxide returns to the second storage tank via the second circulation path, and subsequently the hydroxide is removed by the filtering means in the second filtration path. The electrolytic solution from which the hydroxide has been removed returns to the second storage tank again.

The cooling device according to the present invention can cool the cooled object by supplying cooling water to the cooled object through the supply path. The cooling water that has cooled the object to be cooled is introduced into the cooling water purification device via the recovery path. Since this cooling water purification device includes the above-described water purification device according to the present invention, it is possible to sterilize the cooling water and simultaneously remove the hardness component from the cooling water. The cooling water thus treated is again supplied to the cooled object through the supply path, and cools the cooled object.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A cooling device according to an embodiment of the present invention will be described with reference to FIG. In the figure, a cooling device 1 is for cooling a cooled object A such as factory equipment using cooling water, and includes a cooling water purification device 2 (an example of a water purification device according to the present invention) and a cooling water purification device 2. A supply path 3 for supplying cooling water from the purification device 2 to the cooling body A, and a recovery path 4 for collecting cooling water that has cooled the cooled object A and returning the cooling water to the purification device 2 are mainly provided. Have.

The purifying apparatus 2 mainly includes an electrolytic cell 5, a first storage tank 6 for storing cooling water, and a second storage tank 7 for storing an electrolytic solution.

The electrolytic cell 5 is a container-like member, and has an anode chamber 9 and a cathode chamber 1 using an insulating film 8 having a transparent inside.
It is divided into two chambers, 0 and 2. Here, as the isolation membrane 8, for example, a neutral membrane or an ion exchange membrane is used. Each of the anode chamber 9 and the cathode chamber 10 has an anode 9
a and a cathode 10a are arranged, and a voltage applying device (not shown) is connected between the anode 9a and the cathode 10a. As the anode 9a and the cathode 10a, for example, a titanium plate plated with platinum or a titanium plate sintered with a platinum catalyst is used in terms of good stability.

The first storage tank 6 stores cooling water. A first circulation path 11 for circulating cooling water between the first storage tank 6 and the electrolytic cell 5 is disposed between the first storage tank 6 and the electrolytic cell 5. The first circulation path 11 has a liquid feed path 12 extending from the first storage tank 6 to a lower part of the anode chamber 9 of the electrolytic cell 5 and a return flow path 13 extending from the anode chamber 9 to an upper part of the first storage tank 6. doing.

The liquid feed path 12 includes a pump 14 for sending the cooling water in the first storage tank 6 into the anode chamber 9, and a first filtration path 15. The first filtration path 15 is the liquid supply path 1
In FIG. 2, the pump 14 is provided so as to be branched from the electrolysis cell 5 side with respect to the pump 14, and the end extends above the first storage tank 6. Such a first filtration path 15 includes a first filtration tank 16 for filtering the cooling water from the liquid feeding path 12 and the cooling water filtered by the first filtration tank 16 directed to the first storage tank 6. And a pump 17 for feeding. First filtration tank 1
6 incorporates a filter unit 18 configured using a microporous filter, and further includes an aeration tube 19 and a discharge tube 20 disposed below the filter unit 18.
And The filter unit 18 preferably has a pore size of 0.9 to 0.2 μm. This pore size is 0.
If it exceeds 9 μm, insolubles described below may not be filtered. Conversely, when the thickness is less than 0.2 μm, the amount of the permeated liquid is reduced, so that the membrane area may need to be increased. Such a filter unit 18 can adopt various forms such as a flat membrane shape, a hollow shape, and a tubular shape. However, in consideration of a decrease in the flow rate due to clogging of the filter substance, easiness of regeneration when the flow rate is reduced, easiness of washing, and the like, it is preferable to use a flat membrane-like one.

The aeration tube 19 discharges air to the filter unit 18 continuously or intermittently.

The return flow path 13 extends from the upper part of the anode chamber 9, and its end is disposed above the first storage tank 6.

An electrolyte is stored in the second storage tank 7. The electrolyte stored here contains a chloride that can release chlorine when subjected to electrolytic treatment. Examples of such chloride include sodium chloride and hydrochloric acid. Electrolyte containing such chloride,
For example, it is prepared by adding a solid or liquid chloride such as a solution to the same cooling water as that stored in the first storage tank 6. The concentration of the chloride can be appropriately set according to the voltage applied to the electrolytic cell 5 and the like, but it is usually preferable to set the concentration to about 30 to 2,000 ppm.

A second circulation path 2 for circulating the electrolyte between the second storage tank 7 and the electrolytic cell 5 is provided between the two.
1 is arranged. The second circulation path 21 has a liquid feed path 22 extending from the second storage tank 7 to a lower part of the cathode chamber 10 of the electrolytic cell 5 and a return flow path 23 extending from the cathode chamber 10 to an upper part of the second storage tank 7. doing.

The liquid feed path 22 includes a pump 24 for sending the electrolytic solution in the second storage tank 7 into the cathode chamber 10, and a second filtration path 25. The second filtration path 25 is provided in the liquid supply path 22 so as to be branched from the electrolytic cell 5 side with respect to the pump 24, and has a terminal extending above the second storage tank 7. Such a second filtration path 25 is connected to the liquid feeding path 22.
A second filtration tank 26 for filtering the electrolyte solution from the tank, and a pump 27 for sending the electrolyte solution filtered in the second filtration tank 26 to the second storage tank 7. 2nd filtration tank 2
6 incorporates a filter unit 28 configured using the same fine pore filter as the above-described filter unit 18, and further includes an aeration pipe 29 and a discharge pipe 30 disposed below the filter unit 28. Have. The aeration tube 29 is for discharging air continuously or intermittently to the filter unit 28.

The return flow path 23 extends from the upper part of the cathode chamber 10, and has a terminal located above the second storage tank 7.

The supply path 3 extends from the lower part of the first storage tank 6 of the above-mentioned purification device 2 and is connected to the cooled object A. The supply path 3 includes a pump 31 for sending out cooling water in the first storage layer 6 and a cooler 32 for cooling the cooling water. The cooler 32 is, for example, a cooling tower.

The recovery path 4 extends from the object to be cooled A, and the terminal is disposed above the first storage tank 6.

Next, the operation of the cooling device 1 will be described. When the pump 31 is operated, the first
The cooling water stored in the storage tank 6 is continuously supplied into the supply path 3, cooled by the cooler 32, and introduced into the cooled object A. The cooling water introduced into the cooled object A cools the cooled object A and returns to the first storage tank 6 through the recovery path 4. As a result, the cooling water in the first storage tank 6 circulates through the cooled object A.

In such a cooling device 1, the concentration of ionic hardness components such as calcium ions in the cooling water starts to increase during circulation. In addition, when the cooler 32 is cooled by touching air, it may be contaminated by various bacteria. Therefore, the cooling water contains impurities such as hardness components (for example, metal ions such as calcium ions and magnesium ions), various bacteria, and organic substances (for example, algae, proteins, and carbohydrates).

The cooling water containing impurities as described above is purified by the purification device 2. Next, a purification process by the purification device 2 will be described.

When the pump 14 of the first circulation path 11 is operated, the cooling water stored in the first storage tank 6 passes through the liquid supply path 12 of the first circulation path 11 and enters the anode chamber 9 of the electrolytic cell 5. Will be introduced. On the other hand, when the pump 24 of the second circulation path 21 is operated, the electrolytic solution stored in the second storage tank 7 passes through the liquid supply path 22 of the second circulation path 21 and enters the cathode chamber 10 of the electrolytic cell 5. be introduced. Here, the anode 9a and the cathode 10
When a voltage is applied between the cathode chamber a and a voltage applying device (not shown), the electrolytic solution is electrolyzed in the cathode chamber 10. At this time, the above-mentioned chloride contained in the electrolytic solution is also electrolyzed, and chloride ions generated thereby pass through the separator 8 and pass through the anode chamber 9.
Move in. The chlorine ions moved into the anode chamber 9 are oxidized near the anode 9a. As a result, free chlorine and active oxygen are generated in the vicinity of the anode 9a.
The cooling water introduced therein is sterilized.

The voltage applied by the voltage applying device is initially set high to increase the generation rate of free chlorine, and is set lower after a certain amount of free chlorine is generated (for example, about 0.05 ppm). Is preferred.

In the electrolysis process described above, the anode chamber 9
The cooling water inside becomes acidic, and the cathode chamber 1
The electrolyte in 0 becomes alkaline. As a result, in the anode chamber 9, the above-mentioned organic substances and the like dissolved in the cooling water are oxidized and appear as insoluble substances.
On the other hand, the hardness component (for example, metal ions such as calcium ions) contained in the cooling water passes through the separator 8 and moves into the cathode chamber 10, and is oxidized because the electrolytic solution there is alkaline. It precipitates as a substance.

The acidic cooling water containing free chlorine and insolubles generated in the electrolysis process as described above is returned to the return flow path 1
3 and returns from the anode chamber 9 into the first storage tank 6. As a result, the concentration of free chlorine in the cooling water increases in the first storage tank 6, and the cooling water is sterilized in the first storage tank 6 as well. In the anode chamber 9, it is preferable that the electrolysis is performed so that the pH of the cooling water becomes 6 or less, thereby maintaining the pH of the cooling water in the first storage tank 6 at 6 or less. In this way, the cooling water in the first storage tank 6 can be efficiently sterilized. The pH of the cooling water can be appropriately adjusted by adjusting the concentration of chloride contained in the electrolytic solution introduced into the cathode chamber 10 or adjusting the voltage during the electrolytic treatment.

On the other hand, the cooling water containing insolubles is introduced into the first filtration path 15 via the liquid supply path 12 of the first circulation path 11, and the filter unit 1 of the first filtration tank 16 there is provided.
Filtered at 8. Here, the cooling water passes through the filter unit 18 in the filtration direction by the suction force of the pump 17. Further, the insoluble matter removed from the cooling water becomes a cake and adheres to the surface of the filter unit 18. The cooling water filtered in this way returns to the first storage tank 6 through the first filtration path 15. In addition, the filtration linear velocity in the filter unit 18 is usually 0.3 to 0.5 m /
It is preferable to set the time to about 24 hours. When the filtration linear velocity is set as described above, it is possible to effectively prevent the filtration function of the filter unit 18 from being deteriorated. The cake-like insoluble matter adhering to the filter unit 18 is
The air can be removed by continuously or intermittently discharging air. By doing so, the filtering ability of the filter unit 18 can be maintained satisfactorily. The insoluble matter removed from the filter unit 18 can be taken out from the discharge pipe 20 to the outside.

On the other hand, the alkaline electrolyte containing the hydroxide of the hardness component generated in the cathode chamber 10 returns from the cathode chamber 10 to the second reservoir 7 via the return flow path 23. The pH of the electrolyte is preferably set to 11.5 or more. The pH value of such an electrolytic solution can be adjusted in the same manner as in the case of the cooling water described above. The electrolytic solution that has returned into the second storage tank 7 is supplied to the second circulation path 21 through the liquid supply path 2.
2 and into the second filtration path 25, where the second
It is filtered by the filter unit 28 of the filtration tank 26. Here, the suction force of the pump 27 causes the electrolyte to pass through the filter unit 28 in the filtration direction. Further, the hydroxide removed from the electrolytic solution adheres to the surface of the filter unit 28 in the form of a cake. It is preferable that the filtration linear velocity in the filter unit 28 is set in the same manner as in the case of the filter unit 18 described above. The cake-like hydroxide attached to the filter unit 28 can be removed by continuously or intermittently discharging air from the aeration tube 29. By doing so, the filtering ability of the filter unit 28 can be maintained satisfactorily. The hydroxide removed from the filter unit 28 can be taken out through the discharge pipe 30.

The electrolytic solution filtered by the filter unit 28 returns to the second storage tank 7 through the second filtration path 25.

In the cooling device 1 described above, the object to be cooled A can be cooled while removing and purifying impurities such as germs contained in the cooling water. Therefore, according to the cooling device 1, there is no need to periodically discard and replace the cooling water, and the object to be cooled A can be economically cooled.

The concentration of the chloride contained in the electrolytic solution stored in the second storage tank 7 of the purification device 1 decreases as the electrolysis in the electrolytic cell 5 progresses. It is preferred to adjust the concentration.

[Other Embodiments] (1) In the above-described embodiment, the cooling water is circulated between the first storage tank 6 and the object A to be cooled. It may be configured to circulate also between the tank 7 and the cooled object A. In this case, a path similar to the above-described supply path 3 is provided between the second storage tank 7 and the object A to be cooled, and the recovery path 4 is branched so that its end is located above the second storage tank 7. It is configured to extend.

In such an embodiment, there is no need to use a special electrolytic solution, and the cooling water can be used effectively. (2) In the above-described embodiment, the second filtration path 25 branched from the second circulation path 21 is provided, but the second filtration path 25 may be omitted. In this case, since the hydroxide will be deposited in the second storage tank 7, it is preferable to periodically clean or replace the second storage tank 7.

[0046]

Since the water purifying apparatus according to the present invention has the above-described anode chamber and cathode chamber, the water to be treated can be easily and inexpensively purified. In particular, this water purification device is suitable for simultaneously removing the hard components in the water to be treated and sterilizing it, and simply and inexpensively.

Since the cooling device according to the present invention includes the water purifying device according to the present invention as described above, the cooling target can be cooled while purifying the cooling water.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a cooling device according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cooling device 2 Purification device 3 Supply path 4 Recovery path 6 1st storage tank 7 2nd storage tank 8 Separation membrane 9 Anode chamber 9a Anode 10 Cathode chamber 10a Cathode 11 1st circulation path 15 1st filtration path 18, 28 Filter unit 21 Second circulation path 25 Second filtration path

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Ichiro Nakano 1-31 Uchisaiwaicho, Chiyoda-ku, Tokyo Toyo Glass Co., Ltd. (72) Inventor Shirou Tanso 6-6 Josaicho, Takatsuki-shi, Osaka Shares (72) Inventor Masahiro Hirano 6-6 Josai-cho, Takatsuki-shi, Osaka In-house Asa Corporation

Claims (6)

[Claims] 1. A water purification apparatus for purifying water to be treated, comprising an anode, an anode chamber for electrolytically treating the water to be treated, a cathode, and an electrolytic solution containing chloride. A cathode chamber for processing; a separating unit that partitions the anode chamber and the cathode chamber and has transparency; a voltage applying unit that applies a voltage between the anode and the cathode; and the anode. A water purification device, comprising: a treated water filtration means for filtering the treated water electrolyzed in the chamber. 2. The water purifier according to claim 1, wherein the electrolyte is the water to be treated. 3. The water purification apparatus according to claim 2, further comprising an electrolytic solution filtering means for filtering the electrolytic solution electrolytically treated in the cathode chamber. 4. A water purifying apparatus for purifying water to be treated, comprising: a first storage tank for storing the water to be treated; and a second storage tank for storing an electrolyte containing chloride. And an anode chamber for electrolytically treating the water to be treated, comprising an anode; a cathode chamber for providing an electrolytic treatment for the electrolytic solution containing the chloride; and an anode chamber and the cathode chamber. And a separating means having a permeability, a voltage applying means for applying a voltage between the anode and the cathode, and applying the water to be treated between the first storage tank and the anode chamber. A first circulation path for circulating, and a filtration means for branching off from the first circulation path, for filtering the electrolytically treated water to be treated, and a terminal provided in the first storage tank. A first filtration path extending between the second storage tank and the cathode chamber; A second circulation path for circulating; and a filtering means for branching off from the second circulation path, for filtering the electrolytically treated electrolytic solution, and a terminal extending to the second storage tank. And a second filtration path. 5. The water purifier according to claim 4, wherein said electrolytic solution is said water to be treated. 6. A cooling device for cooling the object to be cooled by circulating cooling water through the object to be cooled, a supply path for supplying the cooling water to the object to be cooled, A recovery path for recovering the cooling water supplied to the object to be cooled; and a supply path disposed between the supply path and the recovery path, for purifying the cooling water from the recovery path and for supplying the cooling water. A cooling water purification device for supplying the cooling water to the cooling water purification device, wherein the cooling water purification device includes an anode, an anode chamber for electrolytically treating the cooling water, and a cathode. A cathode compartment for separating the anode compartment and the cathode compartment, and a separating unit having transparency; a voltage applying unit for applying a voltage between the anode and the cathode; and the anode compartment. To filter the cooling water electrolytically treated with And a filter means, cooling device.