JPH0655177A - Electrochemical treatment apparatus - Google Patents

Abstract

PURPOSE:To achieve the reduction of cost to a large extent, to also save electric power and to always obtain purified water in an apparatus supplying water to be treated in a storage tank to a fixed bed type electrolytic cell to electrochemically treat the same, by arranging the electrolytic cell in the storage tank. CONSTITUTION:Water to be treated is supplied to a storage tank 8 through a supply pipe 11 to be electrochemically treated in an electrolytic cell main body 2 and the purified water 9 is taken out of a taking-out pipe 12 to be supplied, for example, as the cooling water of a heat exchanger. Since there is no circulating line between the electrolytic cell main body 2 and the storage tank 8 in this electrochemical treatment apparatus, the whole of the apparatus is miniaturized to reduce an establishment area and, since the water 9 to be treated in the storage tank 8 is always directly or indirectly in contact with the electrolytic cell, the purified water 9 to be treated is not contaminated by the propagation of bacteria in the storage tank 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrochemical treatment apparatus for electrochemically treating water to be treated such as cooling water for heat exchangers and tap water, and more particularly, it uses a three-dimensional electrode. The present invention relates to an electrochemical treatment device that can be downsized for performing an electrochemical treatment of treated water.

[0002]

2. Description of the Related Art Conventionally, various kinds of aqueous solutions and single water in which other substances are not dissolved have been used for various purposes. These aqueous solutions, etc., the solute provides an appropriate nutrient, or the liquid temperature of the aqueous solution is relatively high temperature preferable for breeding,
In many cases, microorganisms such as bacteria propagate and cause deterioration of the performance of the aqueous solution or the like, adversely affect the product, and floating or accumulating in the treatment device to impair the function of the treatment device. Usually, the number of microorganisms in tap water is 20 / ml or less, but when this tap water is used as cooling water for heat exchangers, the microorganisms remarkably propagate and corrosion of pipes and generation of malodor occur. In order to prevent these phenomena, conventionally, various chemicals such as antifungal agents and precipitation inhibitors have been put into the water to be treated and various filters have been installed in the middle of the piping. It has been pointed out that adverse effects on the water to be treated due to residual chemicals and problems in terms of the cost of using chemicals. Furthermore, there is a problem that antibacterial action against the added drug occurs after a while, and it becomes necessary to consider the next drug or supply a larger amount of drug than necessary.

In the sterilization treatment of photographic processing liquid, pool water, papermaking washing water, heat exchanger cooling water, fish farm water, chemical dilution water, bath water, etc., by adding chemicals such as bactericides and fungicides, the chemicals remain. The problem is unavoidable and the residual chemicals may cause inconveniences other than those caused by microorganisms, and the chemicals used are often dangerous and expensive. With respect to water and the like, from an economical point of view, the emergence of a method that makes it possible to sterilize treated water containing microorganisms more simply, safely, and inexpensively is desired. When electrochemically treating the cooling water for the heat exchanger, an electrolytic cell equipped with a three-dimensional carbonaceous electrode is installed separately from the storage tank for the cooling water for the heat exchanger, and the two are connected by a circulation line. It has been proposed to circulate the cooling water in the electrolyzer to sterilize the cooling water. In the case of treated water that requires a relatively large amount of water treatment such as pool water and papermaking wash water, the treated water is stored in a storage tank (pool or wash water tank) and the stored treated water is electrolyzed. It has been proposed to circulate the solution in a tank for treatment. However, this circulation treatment has a drawback that it requires a large space and a great cost because a circulation line is installed, and further, there is a problem that the reproduction of microorganisms in the circulation line becomes a problem.

The drinking water is supplied to each home, restaurant, etc. through water supply after sterilizing the water stored in a water source such as a reservoir. The above-mentioned sterilization of drinking water is generally treated with chlorine gas, but sterilization of drinking water is relatively good according to the chlorine treatment, while foreign substances are mixed in the treated drinking water due to the influence of residual chlorine. Such a discomfort occurs and the mellowness of natural water is impaired. Drinking water is directly related to human health, and sterilization of bacteria contained in it and prevention of reproduction of mold, that is, killing and removal of microorganisms are indispensable.As a method of sterilizing and preventing mold, the above-mentioned chlorine method is used. Mainstream. However, in tap water sterilization in urban areas, the raw water, such as river water and lake water, is contaminated with various organic substances and more chlorine is added than is necessary to kill microorganisms.Therefore, organic halides, hypochlorite ions and residual chlorine are added. There is a drawback that so-called chlorine odor is generated by generating effective chlorine components such as, and the taste of drinking water after treatment is deteriorated. To remove this chlorine odor, the hypochlorite ion which is the source of the chlorine odor ( A method has been used in which available chlorine is adsorbed on activated carbon and the like, and carbon that is a constituent molecule of activated carbon is oxidized to reduce available chlorine. However, in this method, there is a limit to the adsorption capacity of activated carbon, and there is a fatal defect in terms of the lifetime that effective chlorine decomposition does not occur after a while being used, and in addition, complicated operations such as replacement of activated carbon and cost are required. , It may not be possible to achieve complete removal of odor.

Therefore, as described above, it has a taste similar to that of natural water, which does not harm the human body and can be replaced with chlorine treatment which easily produces hypochlorite ions and the like, which are liable to harm the human body and taste of drinking water. A method of treating drinking water is required. In order to prevent these phenomena, conventionally, various chemicals such as antifungal agents and precipitation inhibitors have been put into the water to be treated and various filters have been installed in the middle of the piping. It has been pointed out that adverse effects on the water to be treated due to residual chemicals and problems in terms of the cost of using chemicals. Furthermore, antibacterial action against the added drug occurs after a while, and it becomes necessary to consider the next drug. In order to solve the above-mentioned drawbacks of the prior art, the applicant has proposed a method of electrochemically treating each of the treated waters to sterilize the treated waters or remove the odor of chlorine. Japanese Patent Application No. 1-326846, Japanese Patent Application No. 2-
No. 236723). In the electrochemical treatment by this method, the water to be treated can be surely reformed without causing chemicals and the like to remain in the water to be treated.

[0006] By this electrochemical treatment, modification treatment such as sterilization of drinking water can be performed without using chemicals, but these electrochemical treatments are intended to treat a large amount of drinking water. Therefore, the electrolytic cell to be used is also large, and the reforming treatment of drinking water and the like can be performed only at the place where the electrolytic cell is installed, and the clean electrochemically treated drinking water is put in a pot or the like and stored. However, there is a case where microorganisms propagate in the pot and pollute drinking water. Especially in overseas where the water situation is poor, various miscellaneous bacteria are contained in tap water and may have an unpleasant odor, and ingesting tap water from the faucet as it is may not only impair the taste but also induce diarrhea and abdominal pain. It is common sense that only drink water that has been disinfected. However, there are limits to how much drinking water can be taken in, and there is the disadvantage that very expensive drinking water must be purchased, especially in areas with high temperatures.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned drawbacks of the prior art and to provide a relatively small-sized treatment apparatus capable of electrochemically treating the water to be treated stored in the storage tank.

[0008]

The present invention is an apparatus for supplying the water to be treated stored in a storage tank to a fixed bed type electrolytic cell to electrochemically treat the water to be treated, wherein It is an electrochemical treatment device characterized by being installed in a storage tank. In the present invention, since the electrochemical reaction such as the substantial redox reaction may not occur on the electrode surface, the tank used in the method of the present invention should be an electrochemical treatment apparatus, but It is called an electrolytic cell according to the name.

The present invention will be described in detail below. The present invention is different from the conventional one in which the electrolytic cell for electrochemical treatment of the water to be treated is installed separately from the reservoir of the water to be treated, and the water to be treated is circulated between the electrolytic vessel and the tank, instead of the electrolytic vessel. To provide an electrochemical treatment device which can always provide clean treated water by preventing the line required for circulation from being installed in the storage tank and preventing contamination of clean treated water in the storage tank. Is characterized by. This electrolytic cell is particularly effective for sterilizing the water to be treated and removing the chlorine odor in drinking water, and supplies drinking water having a chlorine odor to a three-dimensional electrode type electrolytic cell using a carbon electrode for direct current or By applying an AC voltage, it is possible to sterilize the microorganisms in the water to be treated and decompose the chlorine odor component in the drinking water. The above microorganisms include bacteria, fungi, fungi (mold), E. coli, yeast,
Includes morphobacterium, unicellular algae, protozoa, virus and the like. In the device of the present invention, since the fixed bed type electrolytic cell is housed in the storage tank, the storage tank is sufficiently larger than the electrolytic tank, and the water to be treated in the storage tank circulates in the storage tank by convection or the like and flows in the electrolytic tank. Must be electrochemically processed. When the water to be treated is supplied to a fixed bed type three-dimensional electrode electrolyzer, the microorganisms in the water to be treated come into contact with the anode or cathode of the electrolyzer or a dielectric substance described later due to the liquid flow and have a high potential on their surface. It is considered that a strong redox reaction occurs in the microbial cells by receiving energy supply, the activity is weakened, and the microbial cells themselves are killed to perform sterilization.

The storage tank of the electrochemical treatment apparatus of the present invention includes a relatively large cooling water storage tank for a heat exchanger, a pool and a bath, and a small drinking water storage such as a pot.
The storage tank is preferably installed so as to be entirely immersed in the water to be treated in the electrolytic tank, but only partial immersion may be performed if the water to be treated and the three-dimensional electrode are sufficiently contacted with each other. . When an electrolytic cell is installed in the pot, an electrolytic cell having a size suitable for the capacity of the water to be treated in the pot is installed in the lower part of the pot as much as possible. The electrodes of the electrochemical treatment apparatus of the present invention generally include a fixed bed type three-dimensional electrode, preferably a porous three-dimensional carbon electrode and a feeding electrode, and an auxiliary electrode may be installed in addition to these. As the material of the three-dimensional electrode, a platinum group metal oxide coated titanium material (dimensional stability electrode), a platinum coated titanium material, nickel, ferrite and the like can be used in addition to the carbon-based material. The carbon-based material is a porous carbon material that is permeable to the water to be treated, such as activated carbon having a shape such as powder, granules, felt, woven cloth, or porous block, carbon such as graphite or carbon fiber. It can be selected from a group-based material or a material obtained by coating the carbon-based material with a noble metal. Thus, the material forming the three-dimensional electrode is not particularly limited, and any conventionally used electrode material can be used, but it is most preferable to use a carbon-based material. The carbon-based material is a material that satisfies the requirement of the three-dimensional electrode that the conductor resistance is small and the overvoltage is high,
Further, since the carbonaceous material has no toxicity and does not form ions or hydroxides thereof, it is desirable for treatment of water to be treated such as drinking water to be ingested into the body. Further, since the surface area is enormous, the chances of contact with electrolytes, microorganisms or effective chlorine components become very large, and the adsorption capacity also acts to greatly increase the treatment efficiency. Further, the carbonaceous material is inexpensive, and unlike other metal material electrodes, corrosion does not occur even if the electrolysis is stopped, which is advantageous from the economical and operability viewpoint. When a carbon-based material is polarized and used, the higher the dielectric constant of the carbon-based material (dielectric), the higher the degree of polarization. Therefore, a positive and negative electrode is effectively generated, and the treated water is treated efficiently. You can

As the dielectric, activated carbon, graphite,
When a carbon-based material such as carbon fiber is used and the water to be treated is treated while generating oxygen gas from the anode, the dielectric may be oxidized by oxygen gas and dissolved as carbon dioxide gas. In order to prevent this, a porous material ordinarily used as an insoluble metal electrode by coating a platinum group metal oxide such as iridium oxide or ruthenium oxide on a substrate such as titanium on the side of the dielectric which is positively polarized or The ferrite coating layer may be placed in contact with each other so that oxygen generation mainly occurs on the porous material or the like. For example, one or a plurality of disk-shaped dielectrics (three-dimensional electrodes) made of such a material are placed in a DC or AC electric field, and a flat plate, an expanded mesh, a perforated plate, or the like installed at both ends. A DC voltage or an AC voltage is applied between the power feeding electrodes made of a porous plate to polarize the dielectric and form a positive electrode and a negative electrode at one end and the other end of the dielectric, respectively. It is possible to use a polar fixed-bed electrolytic cell. In addition to this, it is also possible to use a monopolar fixed bed electrolytic cell in which a single anode and cathode having the same potential as the power supply electrode are installed. In the electrochemical treatment of the water to be treated, it is necessary that the water to be treated is in contact with the three-dimensional electrode as much as possible, and it is desirable that the water to be treated in the storage tank is evenly in contact with the three-dimensional electrode. . In the device of the present invention, the electrolytic bath is installed in the storage tank, and the water to be treated is always in contact with the three-dimensional electrode, so that the former demand is sufficiently satisfied, but the latter demand is not always satisfied. Therefore, it is preferable to install a stirring propeller or the like in the storage tank and circulate the water to be treated in the storage tank by convection or the like to circulate in the electrolytic tank.

The electrolytic cell of the present invention can also remove calcium ions and magnesium ions which may be contained in the water to be treated. When water to be treated containing calcium ions and magnesium ions is supplied to the electrolytic cell,
Calcium or magnesium hydroxide or the like is deposited on the three-dimensional electrode, especially on the three-dimensional cathode, and is removed from the cathode by a peeling operation or the like to remove calcium ions in the water to be treated. On the contrary, if the electrochemical treatment is continued without removing the hydroxide or the like deposited on the cathode, the cathode is clogged, which impedes the flow of the water to be treated and deteriorates the electrode performance. In order to prevent these, the polarity of the three-dimensional electrode is reversed and the precipitated calcium hydroxide or the like is redissolved on the anode surface having a high hydrogen ion concentration of the water to be treated and removed from the electrode surface. Without causing flow inhibition of the water to be treated due to clogging of the cathode, it is possible to perform the electrochemical treatment of the water to be treated, calcium from the electrode surface without stopping the energization especially for the purpose of sterilization It is very effective because it can remove hydroxides, oxides or carbonates of magnesium and magnesium.
Even if the inside of the electrolytic cell is partitioned by a diaphragm to form an anode chamber and a cathode chamber, it is possible to carry on electricity as it is without using the diaphragm, but without using the diaphragm and the distance between electrodes or the dielectric. When the space between the electrode and the electrode or the dielectric is narrowed, an electrically insulating spacer such as a mesh spacer made of an organic polymer material may be inserted between the electrodes or between the dielectrics to prevent a short circuit. it can. When a diaphragm is used, it is preferably porous such that its opening ratio is 10% or more and 95% or less so as not to interfere with the movement of the water to be treated flowing through it.
It is desirable to use a diaphragm of 20% or more and 80% or less, and the diaphragm must have fine pores having a pore size at least permeable to the water to be treated.

The electrode potential is the anode potential +1.2 V (vs.SHE)
It is desirable that the value be more base and more noble than +0.2 V (vs.SHE) and that the cathode potential be noble than -1.0 V (vs.SHE). In this potential range, almost no generation of oxygen gas and hydrogen gas generated by the usual electrolytic reaction in both electrodes was observed, and the treated liquid by the generated gas was not considered without considering the generated gas that does not contribute to the sterilization of the microorganism. The components of the treatment liquid do not change due to the redox reaction with
Further, the sterilization treatment of the water to be treated can be performed without using the electrolysis electric power to generate electrolytic gas which is a waste except the sterilization of the treatment water and inhibits the sterilization treatment. In the electrolytic cell used in the present invention, a leakage current flows from the electrolytic cell through the water to be treated into other members to induce an undesired electrochemical reaction or the member wall surface is electrochemically corroded to elute the wall surface constituent material. Therefore, a member having higher conductivity than the water to be treated and capable of causing an electrolytic reaction is provided in the back surface of the electrode where the positive and negative electrodes in the electrolytic cell do not face each other and / or in the inlet / outlet pipe of the electrolytic cell. The leak current can be cut off by installing one end thereof so that it can be grounded.

Next, preferred examples of the electrolytic cell which can be used in the present invention and the electrochemical treatment apparatus according to the present invention which uses the electrolytic cell will be described with reference to the accompanying drawings, but the present invention is not limited thereto. is not. FIG. 1 is a schematic vertical cross-sectional view showing an example of a bipolar electrode fixed bed type electrolytic cell that can be used as an electrolytic cell of the electrochemical treatment apparatus of the present invention. A mesh-shaped power feeding anode 3 and power feeding cathode 4 are provided in the vicinity of the upper end and the lower end of the inside of a cylindrical electrolytic cell body 2 having a flange 1 at the top and bottom, respectively. The electrolytic cell body 2 is preferably formed of an electrically insulating material that can withstand long-term use or re-use, and in particular, synthetic resin polyepichlorohydrin, polyvinyl methacrylate, polyethylene,
Polypropylene, polyvinyl chloride, polyethylene chloride,
Phenol-formaldehyde resin and the like can be preferably used. The power supply anode 3 that gives a positive DC voltage is, for example, a carbon-based material (for example, activated carbon, charcoal, coke, coal, etc.), a graphite material (for example, carbon fiber, carbon cloth, graphite, etc.), a carbon composite material (for example, for carbon). Metal powder mixed and sintered), activated carbon fiber non-woven fabric (for example, KE-1000 felt, Toyobo Co., Ltd.), or a material in which platinum, platinum, palladium or nickel is supported, and a dimensionally stable electrode. (Platinum group oxide coated titanium material), platinum coated titanium material, nickel material, stainless steel material,
It is made of iron or the like. The power-supplying cathode 4, which faces the power-supplying anode 3 and applies a negative DC voltage, is formed of, for example, platinum, stainless steel, titanium, nickel, hastelloy, graphite, carbon material, mild steel or a metal material coated with a platinum group metal. ing.

A plurality of electrodes are provided between the power feeding electrodes 3 and 4.
In the illustrated example, three fixed beds 5, that is, three-dimensional electrodes are laminated, and four doughnut-shaped diaphragms or spacers 6 are provided between the fixed beds 5 and between the fixed bed 5 and the power feeding electrodes 3 and 4. Are pinched. The feeding cathode 4 of each fixed bed 5
The surface facing toward is covered with a ferrite coating layer 7, the fixed bed 5 is in close contact with the inner wall of the electrolytic cell body 2 and does not pass through the inside of the fixed bed 5, and between the fixed bed 5 and the side wall of the electrolytic cell body 2. It is arranged so that the leakage flow of the water to be treated and the like flowing through it is reduced as much as possible. When using a diaphragm, a woven fabric as the diaphragm,
A bisque plate, a particle-sintered plastic, a perforated plate, an ion exchange membrane, etc. are used, and a woven fabric, a perforated plate, a net, a rod-shaped member made of an electrically insulating material is used as a spacer. When the water to be treated is supplied to the electrolytic cell 2 having such a structure from below as shown by the arrow in FIG. 1, the fixed bed 5 is polarized so that the lower surface is positive and the upper surface is negative as shown. As a result, an electric potential is generated in the fixed bed 5 and between the fixed beds 5, and the water to be treated flowing in the electrolytic cell comes into contact with the fixed bed 5 which is polarized positively or negatively by the electric potential to modify the water to be treated. Quality processing is performed.
Even when oxygen gas is generated by this electrochemical treatment, the oxygen overvoltage of the ferrite coating layer 7 is lower than the oxygen overvoltage of the carbonaceous material of the fixed bed 5, so that the oxygen gas is generated almost selectively from the ferrite coating layer 7. Elution of the fixed bed 5 due to oxygen gas is suppressed to a minimum, and the treated water can be treated for a long time without replacing the fixed bed 5, that is, without disassembling and assembling the electrolytic cell, which is a complicated operation. And the electrolysis of the electrolytic solution can be performed.

FIG. 2 is a schematic vertical sectional view showing a state in which the electrolytic cell of FIG. 1 (the ferrite coating layer is omitted) is installed in the storage tank of the water to be treated. The same members as those in FIG. 1 are designated by the same reference numerals. And the description is omitted. Water to be treated 9 is contained in a box-shaped storage tank 8 whose top surface can be opened, and four support rods 10 are provided on the bottom surface of the storage tank 8.
Is erected. The lower flange 1 of the electrolytic cell body 2 is placed on the upper end of the supporting rod 10 to hold the electrolytic cell body 2 in the storage tank 8. A lid 13 having a treated water supply pipe 11 whose tip reaches the vicinity of the support rod 10 and a treated water take-out pipe 12 whose base end contacts the treated water 9 is provided at the upper opening of the storage tank 8. The untreated untreated water that has been fitted is supplied to the storage tank 8 through the untreated water supply pipe 11, and the untreated water that has been electrochemically treated and purified in the electrolytic cell body 2 is the untreated water take-out pipe. It is taken out from 12 and supplied for a predetermined purpose, for example, as cooling water for a heat exchanger. In this electrochemical treatment device, since there is no circulation line between the electrolytic cell body and the storage tank, the entire equipment can be downsized and the installation area can be reduced, and the water to be treated in the storage tank is always in direct or indirect contact with the electrolytic cell. Therefore, the purified water to be treated is not contaminated by the propagation of microorganisms in the storage tank, and clean water to be treated is always taken out from the treated water extraction pipe.

FIG. 3 is a schematic vertical sectional view showing a state in which the electrolytic cell of FIG. 1 (the ferrite coating layer is omitted) is installed in a pot for drinking water. The same members as those in FIG. 1 are designated by the same reference numerals. And the description is omitted. Cylindrical pot body made of synthetic resin
14 A pair of upper and lower L-shaped connecting members 15 are fixed to the left wall surface, and the horizontal portions of the connecting members 15 are fastened to the upper and lower flanges 1 of the electrolytic cell body 2 by bolts 16, so that the electrolytic cell body 2 Are held near the left wall surface of the pot body 14. A cover 18 is connected to the upper end of the right wall surface of the pot body 14 via a hinge 17, and the other end of the cover 18 is close to a beak-shaped spout 19 formed on the upper end of the left wall surface of the pot body 14. An auxiliary wall surface 20 is installed outside the left wall surface of the pot body 14, and the electrolytic cell body 2 is placed in the space formed between the left wall surface and the auxiliary wall surface 20.
A driving power source 21 is housed, and the power source 21 is the power feeding anode 3
And the power supply cathode 4. 22 is a stirring blade installed a little above the bottom plate. When tap water is put in the pot body 14, the fixed bed 5 is polarized by the power source 21 and the stirring blades 22 are rotated, the tap water in the pot body 14 is always charged directly or indirectly to the fixed bed 5. Since they come into contact and are electrochemically treated, even if tap water is stored in the pot body 14 for a long period of time, the tap water is hardly contaminated, and clean drinking water is always supplied from the spout 19. be able to.

[0018]

EXAMPLES Next, examples of treatment of water to be treated by the electrochemical treatment apparatus of the present invention will be described, but the present invention is not limited to these examples.

Example 1 Height made of transparent hard polyvinyl chloride resin 1
The cylindrical electrolytic cell shown in Fig. 1 with a diameter of 00 mm and an inner diameter of 50 mm and having a capacity of 3 tons of cooling water for a heat exchanger containing 3200 microorganisms / ml was placed in a column of 80 cm in length and 60 c in width.
It was installed in a box-shaped cooling water storage tank for heat exchanger having a depth of 100 m and a depth of 100 cm. Inside the electrolytic cell, the thickness of the power supply cathode side is 1.0 m.
Dimensionally stable electrodes of 5 m, made of porous carbon and having a fixed diameter of 200 mm and a thickness of 10 mm, were fixed to five, and a doughnut-shaped spacer 6 made of polyethylene resin with an outer diameter of 200 mm, an inner diameter of 180 mm and a thickness of 1 mm was used. It was sandwiched between sheets, and a mesh-shaped power feeding anode and a power feeding cathode each having a diameter of 195 mm and a thickness of 1.0 mm, which were made of titanium and whose surfaces were plated with platinum, were placed in contact with each other.
The cooling water in the storage tank was stirred by a stirring blade so that a liquid flow was generated in the upward direction, and the cooling water was allowed to flow in the electrolytic cell body. In this state, the time-dependent change in the number of microorganisms in the cooling water in the storage tank was measured. The power consumption is shown in Table 1. It can be seen from Table 1 that the number of microorganisms becomes zero after 24 hours, and thereafter remains almost zero.

[0019]

Comparative Example 1 The electrolytic cell body of Example 1 was taken out of the storage tank of Example 1, the electrolytic cell body and the storage tank were connected through a circulation line, and the cooling water in the storage tank was supplied to the electrolytic cell body to generate electricity. It was treated chemically and circulated to a reservoir, which was repeated. The change in the number of microorganisms in the cooling water in the storage tank with time was measured, and the results are shown in Table 1. In addition, Table 1 shows the total amount of electric power consumption in the electrochemical treatment and circulation of this comparative example.
From Table 1, both Example 1 and Comparative Example 1 show almost no difference in the change with time of microorganisms in the cooling water in the storage tank.
It can be seen that the power consumption is larger in Comparative Example 1 as much as the cooling water is circulated, which is not economical.

[0020]

[Table 1]

[0021]

[Example 2] Height 60 made of transparent hard polyvinyl chloride resin
The cylindrical electrolytic cell shown in FIG. 1 having a diameter of 40 mm and an inner diameter of 40 mm was set in a pot having an inner diameter of 100 mm and a depth of 150 mm as shown in FIG. 0.95 liters of simulated water containing 1600 microorganisms / ml was stored in the pot. Inside the electrolytic cell, the thickness of the cathode for feeding is 1.0 mm.
Dimensional stability 5 fixed beds of 39 mm diameter and 10 mm thickness made of porous carbon with electrodes placed in contact with 6 donut spacers made of polyethylene resin with an outer diameter of 40 mm, an inner diameter of 35 mm and a thickness of 1.0 mm. A mesh-shaped power feeding anode and a power feeding cathode each having a diameter of 38 mm and a thickness of 1.0 mm, which were made of titanium and whose surfaces were plated with platinum, were placed in contact with each other. A voltage of 30 V was applied between both power supply electrodes in the pot, and the time-dependent change in the number of microorganisms in the water to be treated in the pot body was measured in this state.

[0022]

[Comparative Example 2] The same electrolytic cell as in Example 2 was installed separately from the pot body, and the treated water having the same number of microorganisms as in Example 2 was electrochemically treated. Since it became zero, the water to be treated was poured into the pot body of Example 2 in which the electrolytic cell body was not installed, and was left as it was to change the number of microorganisms in the water to be treated with time (electrochemical treatment). It was as shown in Table 2 when the starting time was set to zero). From Table 2, it is contaminated by microorganisms if the water to be treated with the number of microorganisms made to be zero by electrochemical treatment is also put in the pot as it is, whereas the water to be treated is put in the pot containing the electrolytic cell. It can be seen that it is possible to always supply water to be treated that is free of microorganisms.

[0023]

[Table 2]

[0024]

According to the present invention, in the apparatus for supplying the water to be treated stored in the storage tank to the fixed bed type electrolysis tank to electrochemically treat the water to be treated, the electrolysis tank is installed in the storage tank. An electrochemical treatment apparatus (claim 1) characterized by the above. INDUSTRIAL APPLICABILITY The present invention can be preferably used for producing a relatively large amount of water to be treated such as a heat exchanger storage tank, a papermaking cleaning water storage tank, a pool and a bathhouse (Claim 2). In the electrochemical treatment apparatus of the present invention, a circulation line is not required in comparison with a conventional apparatus in which a storage tank for heat exchanger cooling water is connected to an electrolytic cell body and circulates in the cooling water electrolysis cell body, so that the installation area is small. Since it is smaller and the facility cost of the circulation line can be reduced, a significant cost reduction can be achieved.
Further, in the device of the present invention, the amount of electric power of the circulation pump can be saved, and a processing effect higher than conventional can be achieved with a small amount of electric power. When the device of the present invention is applied to a pot of drinking water (Claim 3), the drinking water in the pot body always comes into direct or indirect contact with the electrode of the electrolytic cell, so that sterilization is assured even if microorganisms or the like are mixed. Therefore, it is possible to always provide clean drinking water without increasing the size of the pot.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional view showing an example of a bipolar electrode fixed bed type electrolytic cell used in an electrochemical treatment apparatus of the present invention.

FIG. 2 is a schematic vertical cross-sectional view showing an example of the electrochemical treatment apparatus according to the present invention in which the electrolytic cell of FIG. 1 is installed in a treated water storage tank.

FIG. 3 is a schematic vertical sectional view showing an example of the electrochemical treatment apparatus according to the present invention in which the electrolytic cell of FIG. 1 is installed in a water supply pot.

[Explanation of Codes] 1 ... Flange 2 ... Electrolyzer main body 3 ... Power feeding anode 4 ... Power feeding cathode 5 ... Fixed bed 6 ... Spacer 7 ... Ferrite coating layer 8・
..Reservoir 9 ... Water to be treated 10 ... Support rod 11 ...
・ Treatment water supply pipe 12 ・ ・ ・ Treatment water extraction pipe 13 ・ ・ ・
Lid 14 ... Pot body 15 ... Connecting member 16 ... Bolt 17 ... Hinge 18 ... Cover 19
... Beck spout 20 ... Auxiliary wall 21 ... Power supply

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[Procedure amendment]

[Submission date] August 19, 1993

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 3]

Claims (3)

[Claims] 1. An apparatus for supplying water to be treated stored in a storage tank to a fixed bed type electrolytic cell to electrochemically treat the water to be treated, wherein the electrolytic cell is installed in the storage tank. Electrochemical processing equipment. 2. The electrochemical treatment apparatus according to claim 1, wherein the storage tank is at least one of a heat exchanger storage tank, a papermaking wash water storage tank, a pool, and a bathhouse. 3. The electrochemical treatment device according to claim 1, wherein the storage tank is a pot for drinking water.