JPH03224683A - Electrochemical treatment of water to be treated - Google Patents

Abstract

PURPOSE:To simplify the treatment of water for fish culture, etc., and to increase the concn. of dissolved oxygen by supplying water which is to be treated and contains microorganisms to a three dimensional electrode type electrolytic cell and subjecting the water to be treated to an electrolytic treatment while generating gaseous oxygen in the electrolytic cell. CONSTITUTION:The rear surfaces of respective fixed beds 5 are polarized positive and the front surfaces negative and a potential is generated in and between the fixed beds 5 when the electrodes are energized while the water for fish culture supplied to the electrolytic cell 2 is supplied from below to the electrolytic cell as shown by arrows. The water for fish culture flowing in the electrolytic cell comes into contact with the fixed beds 5 polarized positive or negative by this potential, by which the reforming treatment, such as sterilizing of underwater fungi and bacteria, is executed. The impressed potential is high and the gaseous oxygen dissolves in the water when the gaseous oxygen is generated from the positive polarity part. This water is taken as the fish culture water contg. the dissolved oxygen at a high concn. out of the upper part of the electrolytic cell 2 and is circulated to a fish culture pond.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an electrolytic treatment method and apparatus for sterilizing and improving the performance of water containing microorganisms, such as water used in fish farms, and more particularly, Performance improvements such as sterilization of bacteria and mold can be achieved by electrolytically treating water used for raising fish in fishing ponds and other fishing grounds while generating gas using an electrolytic tank, especially a three-dimensional electrode electrolytic tank. The present invention relates to a method and apparatus for increasing the amount of dissolved oxygen and promoting the cultivation and growth of fish.

(Prior Art) In addition to natural fish that breed in the sea and rivers as various fish resources, farmed fish in aquaculture farms have recently attracted attention, and a large number of farmed fish are being supplied to the market. When raising these fish in aquaculture farms, the bacteria and mold that are often contained in the fish farming water can inhibit the growth of the fish or kill them, but even when there are few bacteria, the fish can still be contaminated. or adhere to fish, reducing their commercial value. In order to suppress these adverse effects, large amounts of antifungal agents such as bactericides are added to the fish farming water, and antibiotics are also administered to minimize damage to fish caused by the antifungal agents. Also, to increase resistance, large amounts of nutrients such as vitamins are administered to the fish, and on top of that, they are fed. Therefore, the amount of feed needed for reared fish is small compared to the total intake, which slows down the growth rate required for aquaculture, and furthermore, fungicides accumulate and inhibit growth, or the human body Fish contaminated with fungicides that are harmful to humans will be supplied to the market.

Furthermore, like normal water, there is about 3 ppm of dissolved oxygen in fish farming water, and fish ingest this oxygen to grow. Administration of large amounts of chemicals reduces the amount of dissolved oxygen or reacts with dissolved oxygen to reduce the amount of dissolved oxygen and inhibit growth.

In addition to water used for fishing farms, there is water to be treated to prevent mold and increase the amount of dissolved oxygen.

(Problems to be Solved by the Invention) The protection of fish using the above-mentioned anti-mold agent not only involves the problem of contamination of the fish itself, but also the amount of anti-mold agent used because the amount of water used for fish cultivation is critical. Another problem is that the cost increases. Furthermore, the cost of nutritional supplements associated with the use of these fungicides will also be reduced, and if we can avoid the use of fungicides that are not directly linked to the growth of fish, but rather cause negative effects, it will be possible to reduce costs and improve human health. This method has many advantages because harmless fish can be grown and commercialized in a short period of time.

Furthermore, if it is possible to increase the dissolved oxygen concentration in fish farming water, the activity of fish will become more active, the amount of feed intake will increase accordingly, and the growth of the fish will be significantly promoted. If dissolved oxygen concentration can be increased at low cost, fish that are larger in size and have higher commercial value than conventionally farmed fish can be raised in a short period of time and supplied to the market.

Furthermore, in the case of mold prevention of water to be treated other than fishing ground water, the use of mold inhibitors often causes similar disadvantages, and an increase in the amount of dissolved oxygen often brings about various advantages.

(Objective of the Invention) An object of the present invention is to provide a method and apparatus for sterilizing fish farming water, etc., and increasing the dissolved oxygen concentration, etc., relatively easily and without using antifungal agents. shall be.

(Means for Solving the Problems) The present invention firstly supplies water to be treated containing microorganisms to a three-dimensional electrode type electrolytic cell, and supplies the water to be treated while generating oxygen gas in the electrolytic cell. This is an electrolytic treatment method for water to be treated which is electrolytically treated, and the second is a three-dimensional electrode type having a bipolar fixed bed that allows the water to be treated containing microorganisms to flow and treats the water to be treated while generating gas. This is an electrolytic treatment device for water to be treated, which includes an electrolytic cell.

The present invention will be explained in detail below.

The present invention supplies water to be treated such as fish farming water to a three-dimensional electrode type electrolytic cell, and applies a DC voltage or a low frequency AC voltage to the electrolytic cell to generate gas by electrolysis. It is characterized by performing sterilization treatment, etc. Although the effectiveness of conventional electrolytic sterilization has been confirmed, it has not been put to practical use. The reason why the method of the present invention or the electrolytic treatment apparatus of the present invention sterilizes fish culture water or improves its performance is not necessarily clear, but it can be inferred as follows.

The water to be treated according to the present invention, particularly the water for fish farming, has an appropriate temperature and contains nutrients, and is in an environment where molds, bacteria, etc. can easily grow. In conventional electrolysis or electrochemical treatment, molds and bacteria are not ionized, so the number of molds and bacteria that undergo redox reactions on the electrode surface and die is extremely limited, and complete sterilization is not achieved. It is presumed that a situation has been created in which bacteria that are highly resistant to chemical treatments are actually multiplying.

According to the present invention, when a DC voltage or a low-frequency AC voltage is applied to the water to be treated, non-ionized mold and bacteria in the water to be treated are also removed from the anode or cathode of the three-dimensional electrode type electrolytic cell or the dielectric described later. It is thought that when the cells sufficiently come into contact with a three-dimensional electrode having a three-dimensional structure with an extremely large surface area, such as a cell or a particle, the cell undergoes an oxidation-reduction reaction on the surface, causing the cell to be destroyed and die. Therefore, it is possible to produce the same bactericidal or antifungal effect without using conventional bactericidal or antifungal agents.

Furthermore, if the water to be treated is hard water, it will contain impurities such as calcium ions and magnesium ions. When the water to be treated is electrolytically treated, it is reduced on the cathode or three-dimensional electrode of an electrolytic cell or three-dimensional electrode type electrolytic cell, and is deposited on the cathode as hydroxide and removed from the water to be treated. For example, there will be no negative impact on fish and the like.

In the present invention, the value of the DC voltage or low frequency AC voltage applied between the anode and cathode is not particularly limited, and can be any value that causes high current density electrolytic treatment that generates gas on the electrode surface. When using voltage, it is desirable that the frequency be 10 hertz or less. When the water to be treated is treated while generating gas according to the present invention, a part of the oxygen generated from the anode or anodically polarized particles is directly dissolved in the water to be treated such as fish farming water undergoing electrolytic treatment. This causes the dissolved oxygen concentration to rise to a higher value than the normal value, and as the bacteria die, the oxygen consumed by the bacteria is no longer consumed, so the oxygen concentration further increases, which is detrimental to the growth of fish, etc. A preferable oxygen concentration can be achieved. Anode potential is +0
．． 2 to +1.5 V Cvs.

5IIE), it is possible to sterilize water for fish farming and remove impurities, but substantial oxygen gas generation occurs at +1.0V or higher, so in the present invention, the anode potential is set at +1.0V or higher.
Preferably it is +1.2V or more. The preferred cathode potential is within a range of more than 10.5 V (vs. 5llE), and within this range, fish farming water and the like to be treated can be sterilized and impurities removed. At an anode potential of +1.2■ or more, oxygen gas is generated and a small amount of ozone gas is produced as a by-product, and both gases have a positive effect on the growth of fish.

The gases generated by water electrolysis, that is, oxygen gas and hydrogen gas, are usually generated at a mixing ratio within the explosive limit, so if a relatively large DC voltage is applied and gas is generated, air must be used to avoid the risk of explosion. It is preferable to dilute with an inert gas. For example, it is preferable to install a means for separating the electrolytic gas generated at the outlet of the electrolytic cell and a means for diluting the separated electrolytic gas with air so that the electrolytic gas concentration becomes 4% by volume or less. Since the electrolytic treatment apparatus of the present invention has a relatively small capacity and generates a small amount of gas, it is not necessary to install the gas separation means.

The electrolytic cell included in the device of the present invention is a bipolar defined prototype three-dimensional electrode electrolytic cell, and the electrolytic cell used in the method of the present invention includes all electrolytic cells including the bipolar fixed-bed two-dimensional electrode electrolytic cell. do. In the treatment of water to be treated according to the present invention, the treatment efficiency increases as the number of opportunities for the water to be treated to come into contact with electrodes, dielectrics, particles, etc. described later, increases. Therefore, using a multi-electrode fixed bed three-dimensional electrode electrolytic cell with a large surface area of electrodes, etc. can increase the processing efficiency compared to using other electrolytic cells. It is advantageous in that the required equipment size can be smaller than other electrolytic cells.

The three-dimensional electrode in the three-dimensional electrode electrolytic cell of the present invention is made of a porous material through which the water to be treated can pass through, for example, granular, spherical, felt, woven cloth, porous block, and has a large number of through holes. Carbon-based materials such as activated carbon, graphite, carbon fiber, etc. that have the shape of solid bodies, or metal materials such as nickel, copper, stainless steel, iron, titanium, etc. that have the same shape, and those metal materials coated with precious metals. Preferably, the three-dimensional electrode is made of a plurality of dielectric materials made of a dielectric material. A direct current voltage or a low frequency alternating current voltage is applied between the anode and cathode for power feeding made of a plate to polarize the dielectric, and positive and negative charges are formed at one end and the other end of the dielectric, respectively, and the dielectric is polarized. In addition, separate from the power supply anode and cathode, three-dimensional materials that function as an anode or a cathode are installed alternately so as not to short-circuit and are electrically connected to form a double-electrode fixed-bed two-electrolytic cell. It can be done. In addition, when using the aforementioned solid body with a large number of through holes as a three-dimensional electrode, the aperture ratio should be 10% or more.
% or less, preferably 20% or more and 80% or less.

When treating water using a carbon-based material such as activated carbon, graphite, or carbon fiber as the dielectric material, the dielectric material is easily oxidized by the generated oxygen gas and dissolved as carbon dioxide gas. In order to prevent this, a porous material that is usually used as an insoluble metal electrode is coated with a platinum group metal oxide such as iridium oxide or ruthenium oxide on a base material such as titanium on the anodic polarization side of the dielectric. They may be placed in contact so that oxygen evolution occurs primarily on the porous material.

When an anode and a cathode other than the dielectric or the power supply anode and cathode are brought close together to lower the voltage, an electrically insulating spacer such as a mesh spacer made of an organic polymer material is inserted to prevent short circuits. It is preferable to do so.

If there is a relatively large gap in the electrolytic cell through which the water to be treated, such as water for fishing farms, flows, through which the water to be treated can flow without coming into contact with the dielectric, the anode, or the cathode, the treatment efficiency of the water to be treated will be improved. Therefore, it is desirable that the dielectric material etc. be arranged so that the flow of the water to be treated in the electrolytic cell will not be short-circuited.

A three-dimensional electrode electrolytic cell with such a configuration is installed close to a fish farm, fishing pond, etc. when the water to be treated is water for fish farming, and circulates a part of the water for fish farming in the fish farm, etc. It can be used by returning to the aquaculture farm after performing sterilization etc. in the electrolytic tank, etc., and can also be installed adjacent to an aquarium for household ornamental fish, etc., to circulate the water in the aquarium. It is also possible to perform treatments such as sterilization.

Note that if the treated water supplied to the electrolytic cell is a laminar flow, it may pass through the electrolytic cell without making sufficient contact with the surface of the dielectric, etc., so the treated water passing through the electrolytic cell may be
It is more preferable that the turbulent flow has a Reynolds number of 0 or more, particularly 500 or more, and is allowed to pass through the electrolytic cell or the like while sufficiently moving in the lateral direction.

In addition, if bacteria cannot be removed sufficiently by passing through the electrolytic tank once, the treated water may be passed through the electrolytic tank again, or water for cultivating fish, etc. from the aquaculture pond can be sequentially supplied to the electrolytic tank. may be used to increase overall processing efficiency.

In addition, when the electrolytic cell of the present invention is used to treat water for fish farming, a leakage current is generated in the electrolytic cell, which may cause electrocution of fish in the fish farm or may cause water to pass through the fish farming water to be treated from the electrolytic cell. metal parts, such as flowing into a water tank,
Electrochemical corrosion such as elution may occur in the member. Therefore, a member with higher conductivity than the fish farming water is installed at the back of the electric rod where the power feeding anode and cathode in the electrolytic cell do not face each other and/or in the inlet/outlet piping of the electrolytic cell so that one end thereof can be grounded. The leakage current can be cut off. If the electrolytic tank is installed close to fishing farm water, especially a home aquarium, and electrolytic treatment is performed without using the conductive member, the leakage current will reach about 30 mA and the goldfish etc. in the aquarium will be affected. If an abnormality starts to occur and the distance reaches about 50 m, goldfish will be electrocuted, so it is desirable to suppress the leakage current to less than 50mA, preferably less than 30mA, and if the conductive member is used, the leakage current can be reduced to several μm. I can do it.

In addition, fish farming water, etc. contains algae, and if this water is supplied as is to the electrolytic tank, it may adhere to the electrodes of the electrolytic tank and reduce the treatment efficiency. Therefore, a filter is installed in the electrolytic tank and the It is desirable to perform filtration treatment before electrolytic treatment of fish farming water.

Next, a preferred example of an electrolytic cell that can be used in the present invention will be described based on the accompanying drawings, but the electrolytic cell that can be used in the method of the present invention is not limited to this electrolytic cell.

FIG. 1 is a schematic longitudinal cross-sectional view showing an example of a fixed-bed electrolytic cell that can be used as the electrolytic cell of the present invention, and FIG.
FIG. 2 is a schematic diagram showing a state in which the electrolytic cell shown in the figure is installed in close proximity to an aquaculture pond in an aquaculture farm.

A mesoche-shaped power feeding anode 3 and a power feeding cathode 4 are provided near the upper and lower ends of a cylindrical electrolytic cell body 2 having flanges 1 on the upper and lower sides, respectively. Electrolytic cell body 2
is preferably made of an electrically insulating material that can withstand long-term use or repeated use, and is particularly made of synthetic resins such as polyepichlorohydrin, polyvinyl methacrylate, polyethylene, polypropylene, polyvinyl chloride, polyethylene chloride, and phenol-formaldehyde. Resins etc. can be preferably used. The power feeding anode 3 that provides a positive DC voltage is made of, for example, a carbon material (such as activated carbon, charcoal, coke,
coal, etc.), graphite materials (e.g. carbon fiber, carbon cloth, graphite, etc.), carbon composite materials (e.g. carbon mixed with metal powder and sintered), activated carbon fiber nonwoven fabrics (e.g. K E-1000 felt, Toyobo Co., Ltd.), or materials with platinum, platinum, palladium or nickel added thereto, dimensionally stable electrodes (platinum group oxide coated titanium materials), platinum coated titanium materials, nickel materials, stainless steel materials, iron materials It is formed from etc. The power supply cathode 4 which faces the power supply anode 3 and applies a negative DC voltage is made 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 fixed beds 5, three in the illustrated example, are stacked between the repowering electrodes 3.4, and between the fixed beds 5 and between the fixed beds 5 and the repowering electrodes 3.4. Four porous diaphragms or spacers 6 are sandwiched between them. Each fixed bed 5
is in close contact with the inner wall of the electrolytic cell body 2 and passes through the fixed bed 5.
First, the arrangement is such that the leakage flow of fish farming water flowing between the fixed bed 5 and the side wall of the electrolytic cell body 2 is minimized. When a diaphragm is used, a woven fabric, an unglazed plate, a particle sintered plastic, a perforated plate, an ion exchange membrane, etc. are used as the diaphragm, and a woven fabric, a perforated plate, a mesh, etc. made of an electrically insulating material are used as the spacer. A rod-shaped material is used.

As shown in FIG. 2, the electrolytic cell 2 having such a configuration is installed, for example, at the edge of the aquaculture pond 11 of an aquaculture farm together with a filter 12. The volunteer water 13 of the aquaculture pond 11 is passed through the supply pipe 15 by a pump 14 to the filter 1.
4, solid impurities such as algae are filtered and removed, and then introduced into the electrolytic cell 2 having the above-described configuration.

When the fish farming water supplied to the electrolytic cell 2 is supplied from below as shown by the arrow in FIG. 1 and electricity is supplied, each of the fixed beds 5 is polarized with the lower surface being positively polarized and the upper surface being negatively polarized as shown in the figure. An electric potential is generated within the fixed bed 5 and between the fixed beds 5, and the fish farming water flowing through the electrolytic cell comes into contact with the fixed bed 5 which is polarized positively or negatively due to this potential, and removes mold and bacteria in the fish farming water. Modification treatments such as sterilization are performed. Furthermore, when oxygen gas is generated from a positively polarized portion with a high applied potential, the generated oxygen gas dissolves in the fish farming water, creating a dissolved oxygen gas with a higher concentration than the fish farming water before being supplied to the electrolytic cell 2. The water for fish farming is taken out from above the electrolytic cell 2 and circulated to the aquaculture pond 11 through a return pipe 16 as shown in FIG.

FIG. 3 shows another example of a bipolar fixed bed type electrolytic cell that can be used in the present invention. A mesoche-like insoluble metal material 7 is installed in close contact with the side to be positively polarized, and since the other members are the same as those in FIG. 1, they are given the same reference numerals and their explanation will be omitted.

The fixed bed 5 to which a DC voltage is applied is most polarized at both ends thereof, and when gas is generated, the most intense gas generation occurs at both ends. Therefore, the end of the fixed bed 5 facing the power supply cathode 4, where the strongest anodic polarization occurs, that is, where oxygen gas is generated most violently, has the fastest (dissolution occurs)
Jiru. As shown in the figure, if the insoluble metal material 7 is installed in this part, most of the oxygen gas will be removed from the insoluble metal material 7 because the overvoltage of the insoluble metal material 7 is lower than the overvoltage of the carbon-based material forming the fixed bed 5. Since the fixed bed 5 hardly comes into contact with oxygen gas, the dissolution of the fixed bed 5 is effectively suppressed. The fish farming water supplied to the electrolytic cell 2 is treated and sterilized in the same manner as in FIGS. 1 and 2.

FIG. 4 shows another example of a bipolar fixed bed electrolytic cell that can be used in the present invention.

A mesh-shaped power feeding anode 23 and a power feeding cathode 24 are provided near the upper and lower ends of the cylindrical electrolytic cell body 22 having flanges 21 on the top and bottom, respectively. The electrolytic cell body 22 is preferably made of an electrically insulating material, particularly a synthetic resin, which can withstand long-term use or repeated use.

Between the two power supply electrodes 23 and 24, there are a large number of fixed bed forming particles 25 made of a conductive material such as a carbon material, and a smaller number of insulating particles 28 made of synthetic resin, for example, than the fixed bed forming particles 25. are almost evenly mixed. The insulating particles 28 have a function of preventing the power feeding anode 23 and the power feeding cathode 24 from being completely short-circuited.

When electricity is supplied to the electrolytic cell having such a structure while supplying water for fish farming from below as shown by the arrow, each fixed bed forming particle 25 is transferred to the power supply vJj electrode 2 pole side 3 side and the power supply cathode side 3. The 24 side is positively polarized and functions as a three-dimensional electrode with a large surface area, and in the same way as the electrolytic cells shown in Figs. High concentration is performed and taken out from above the electrolytic cell.

(Example) Examples of fish farming water reforming treatment according to the method of the present invention will be described below, but the examples are not intended to limit the present invention.

Height 10 (Jam,
The electrolytic cell shown in FIG. 1, which has a cylindrical flanged shape with an inner diameter of 5011 mm, was installed together with a filter and a pump in the fish water circulation system of an aquarium in which goldfish are kept.

Inside the electrolytic cell, 5 fixed beds made of carbon fiber with a diameter of 5011 mm and a thickness of 10 mm were sandwiched between 6 polyethylene resin diaphragms with a diameter of 50 mm and a thickness of 1.2 mm with an open area ratio of 80%. A mesoche-shaped power feeding anode and a power feeding cathode made of titanium whose surfaces were plated with platinum and having a diameter of 481 mm and a thickness of 1.0 mm were placed in contact with the upper and lower diaphragms at both ends.

The fish water in the aquarium was fed to the electrolytic tank at a rate of 0.517 min, and the anode and cathode voltages shown in Table 1 were applied between the power supply electrodes to treat the fish water. First, the number of bacteria and dissolved oxygen concentration in the fish culture water before and after passing through the electrolytic tank.
Summarized in the table.

From Table 1, it can be seen that the number of bacteria in fish farming water is significantly reduced by treating it in an electrolytic bath, and that the dissolved oxygen concentration increases as the amount of oxygen gas generated increases.

After 30 days, the electricity supply was stopped, the electrolytic cell was disassembled, and the state of the fixed bed was observed, and no change was observed in the electrolytic cell.

(Effects of the Invention) The method of the present invention supplies treated water containing microorganisms to an electrolytic cell such as a bipolar three-dimensional electrode type electrolytic cell or a two-dimensional electrode type electrolytic cell, and generates oxygen gas while supplying the treated water containing microorganisms. This is a method for electrolytically treating water to be treated, in which treated water is brought into contact with the oxygen gas, the three-dimensional electrode, the three-dimensional electrode, etc., and subjected to electrolytic treatment (claim 1).

When the water to be treated is treated according to the present invention, not only can bacteria and molds be sterilized without using disinfectants or moldproofing agents, thereby saving the cost of moldproofing agents, but also the generated oxygen gas can be It is possible to obtain treated water containing a high concentration of dissolved oxygen by dissolving it in the treated water.

Therefore, if the water to be treated is water for fish farming (Claim 2),
By treating the water for fish farming according to the present invention, the concentration of dissolved oxygen in the water for fish farming increases, and the dissolved oxygen increases the activity of the fish to be raised, promoting growth, and increasing the size of the fish with high commercial value. This makes it possible to provide large-scale farmed fish to the market. Moreover, the above-mentioned anti-mold agents cannot be said to be harmless to the human body, and the anti-mold agents etc. often accumulate in fish reared by conventional methods, whereas the anti-mold agents etc. are not harmful to the human body. By rearing fish in fishing ground water, it becomes possible to supply the market with fish that taste good and do not adversely affect health.

When using fishing farm water as the water to be treated, if the leakage current from the electrolyzer reaches a high value, it may cause abnormalities in goldfish and farmed fish, and sometimes cause electrocution, so the leakage current should be less than 50 mA. It is desirable that claim 3
).

Treatment of water to be treated using the device of the present invention, which is an electrolytic treatment device for water to be treated (claim 4) comprising a three-dimensional electrode type electrolytic cell having a bipolar fixed bed through which water to be treated can flow. By doing this, as in the method of the present invention, bacteria and molds can be sterilized without using disinfectants or moldproofing agents, thereby saving the cost of moldproofing agents and obtaining treated water with a high concentration of dissolved oxygen. I can do it.

Furthermore, since the electrolytic cell used is a three-dimensional electrode electrolytic cell with a bipolar fixed bed that has a larger surface area than a two-dimensional electrode electrolytic cell, the treatment efficiency of the water to be treated remains high. be done.

If the treated water flowing in the electrolytic cell is a laminar flow, the treated water will pass through the three-dimensional electrode electrolytic cell without making sufficient contact with the electrodes, etc., so the treated water will have a Reynolds number of 5.
It is preferable that the turbulent flow is 0.00 or more (Claim 5) so that the water to be treated moves also in the lateral direction and sufficiently contacts the electrodes and the like.

Furthermore, as described above, in the electrolytic cell of the present invention, a leakage current occurs in the electrolytic cell, and the leakage current flows into other metal members, causing electrochemical corrosion such as elution in the members, or causing damage to farmed fish. It may cause abnormalities. In order to prevent this, a member having higher conductivity than the water to be treated is installed at an appropriate location where the power feeding group cathode does not face each other, so that one end of the member can be grounded (Claim 6). It is preferable to block it.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an example of a bipolar fixed bed electrolytic cell that can be used as the electrolytic cell of the present invention, and FIG. 2 is a schematic diagram showing the installation situation of the electrolytic cell shown in FIG. FIG. 3 is a longitudinal sectional view showing an example of another bipolar fixed bed electrolytic cell, and FIG. 4 is a longitudinal sectional view showing yet another example of a bipolar fixed bed electrolytic cell. 1.21...Flange 2.22...Electrolytic cell body 3.2
3...Anode for power supply 4.24...Cathode for power supply 5...Fixed bed 6...Spacer 7...Insoluble metal material 11...Aquaculture pond 12...Filter 13...Fish culture water 14 ... Pump 15 ... Supply piping work 6.
...Return pipe 25...Particles for forming a fixed bed 2 days...Insulating particles Fig. 1 Fig. 2

Claims (6)

[Claims] (1) An electrolytic treatment method for water to be treated, in which water to be treated containing microorganisms is supplied to a three-dimensional electrode type electrolytic cell, and the water to be treated is electrolytically treated while generating oxygen gas in the electrolytic cell. (2) The electrolytic treatment method according to claim 1, wherein the water to be treated is water for fish farming. (3) The electrolytic treatment method according to claim 1 or 2, wherein the amount of leakage current from the electrolytic cell is 50 mA or less. (4) An electrolytic treatment device for water to be treated that includes a three-dimensional electrode type electrolytic cell having a bipolar fixed bed that allows the water to be treated containing microorganisms to flow therethrough and processes the water to be treated while generating gas. . (5) The Reynolds number of the water to be treated flowing in the electrolytic cell is 50.
The electrolytic treatment apparatus according to claim 4, wherein the electrolytic treatment apparatus is 0 or more. (6) A member with higher conductivity than the water to be treated is installed at the back of the electrode where the anode and cathode do not face each other in the three-dimensional electrode type electrolytic cell and/or in the inlet/outlet piping of the electrolytic cell so that one end thereof can be grounded. The electrolytic treatment apparatus according to claim 4 or 5.