JP2004344746A - Alternating current electrolysis method and apparatus therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To dispense with chemicals etc., such as reducing agents in improving liquid quality and to prevent an effect of lowering the oxidation-reduction potential of water from lowering by making scale, etc., hardly adsorbable on electrodes, more particularly a grounding electrode in electrolyzing the water. <P>SOLUTION: A pair of the alternating electrodes made of metal to lower the oxidation-reduction potential and at least one first grounding electrode are arranged in the liquid and an AC is applied between a pair of the alternating electrodes. The oxidation-reduction potential of the liquid is lowered by controlling the first grounding electrode so as to periodically be applied with an AC from the potential of grounding, by which the scale, etc., are made hardly adsorbable on the grounding electrode and the effect of lowering the oxidation-reduction potential of the water is prevented from lowering. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to electrolysis of a liquid, for example, sewage such as lakes, rivers, or industrial wastewater, or liquid such as mineral water or drinking water by alternating current to a liquid having a low oxidation-reduction potential.
[0002]
[Prior art]
BACKGROUND ART Conventionally, in the case of reforming wastewater such as lakes, rivers or industrial wastewater, or liquid such as drinking water, the reforming is generally performed by causing a chemical reaction using various reducing agents or the like. Was.
[0003]
In addition, as a method of reforming a liquid without using a chemical such as a reducing agent, for example, an electrode made of a metal that reduces the oxidation-reduction potential is used for the first and second electrodes, and a third electrode is used. There is a technique in which an AC is applied between the first and second electrodes to electrolyze water to lower the oxidation-reduction potential of water (see Patent Document 1).
[0004]
Further, a pair of applied electrodes and a ground electrode close to the applied electrode are arranged, stainless steel is used for the ground electrode, and an electrode made of a highly electrolytic metal is used for the applied electrode. There is a technique using a signal generator for controlling the frequency of the alternating current when performing water treatment to lower the oxidation-reduction potential of water by applying an alternating current (see Patent Document 2).
[0005]
In Patent Document 1 and Patent Document 2, both are by the same applicant, and in that an alternating current is applied between a pair of applied electrodes, and a ground electrode is disposed close to the pair of applied electrodes. They are common.
[0006]
[Patent Document 1]
Japanese Patent No. 2623204 (Claim 1)
[Patent Document 2]
Japanese Patent No. 3337422 (Claim 1)
[0007]
[Problems to be solved by the invention]
However, when a method of causing a chemical reaction using a chemical such as a reducing agent according to the conventional technique is performed, it is necessary to prepare a chemical such as a reducing agent every time the liquid is reformed, which is costly. There was a problem of becoming expensive.
[0008]
Further, in the known technique of Patent Document 1, when water is electrolyzed, the scale or the like contained in the liquid is adsorbed to the electrode, and the water or the like is kept in a state where the scale or the like is adsorbed. When electrolysis is performed, there is a problem that the effect of lowering the oxidation-reduction potential of water is reduced.
[0009]
Similarly, in the known technique of Patent Document 2, when water is electrolyzed, scale and the like are adsorbed to the ground electrode, and water is electrolyzed while the scale and the like are adsorbed in this manner. In this case, there is a problem that the effect of lowering the oxidation-reduction potential of water is reduced.
[0010]
Therefore, in the prior art, it is not necessary to use a chemical such as a reducing agent, etc., and when electrolyzing water, it is difficult to adsorb scales and the like to electrodes, especially to the grounded electrode, thereby lowering the oxidation-reduction potential of water. There is a problem to be solved in preventing the effect, that is, the effect of generating hydrogen from being reduced.
[0011]
[Means for Solving the Problems]
As a first invention according to the present invention as a specific means for solving the above-mentioned problems of the conventional example, as a first invention, a pair of AC electrodes made of a metal for lowering the oxidation-reduction potential in a liquid, and at least one first grounded electrode And applying an alternating current between the pair of AC electrodes, and controlling the first grounded electrode to periodically apply an alternating current from a ground potential to reduce the oxidation-reduction potential of the liquid. The present invention provides a method of alternating current electrolysis of a liquid characterized by lowering the temperature.
[0012]
In the first invention, the alternating current applied to the first grounded electrode is synchronized with one of the alternating currents applied to a pair of alternating current electrodes; the alternating current applied to the first grounded electrode is The first grounding electrode is formed in a mesh shape having a substantially rectangular shape; and the pair of AC electrodes is connected to the grounding time. A mesh-like second grounding electrode having a substantially box shape is provided around the first grounding electrode; the pair of AC electrodes is formed by depositing or plating platinum on a titanium material; Controlling the frequency of the alternating current applied to the pair of alternating current electrodes; as an additional requirement.
[0013]
According to a second aspect of the present invention, there is provided a pair of AC electrodes made of a metal for lowering an oxidation-reduction potential in a liquid, and at least one first grounded electrode, and an AC is applied between the pair of AC electrodes. And an AC electrolysis apparatus for a liquid, wherein the first grounded electrode is controlled so as to periodically apply an alternating current from a ground potential to lower the oxidation-reduction potential of the liquid. Is what you do.
[0014]
In the second aspect, the alternating current applied to the first grounded electrode is synchronized with one of the alternating currents applied to a pair of alternating current electrodes; the alternating current applied to the first grounded electrode is The first grounding electrode is formed in a mesh shape having a substantially rectangular shape; and the pair of AC electrodes is connected to the grounding time. A mesh-like second grounding electrode having a substantially box shape is provided around the first grounding electrode; the pair of AC electrodes is formed by depositing or plating platinum on a titanium material; Controlling the frequency of the alternating current applied to the pair of alternating current electrodes; as an additional requirement.
[0015]
In the AC electrolysis method according to the present invention, a pair of AC electrodes made of a metal that lowers an oxidation-reduction potential in a liquid, and at least one first grounded electrode are disposed, and the AC electrode is disposed between the pair of AC electrodes. Applying an alternating current, and lowering the oxidation-reduction potential of the liquid by controlling the first grounded electrode to periodically apply an alternating current from the ground potential. A pair of AC electrodes made of a metal for lowering an oxidation-reduction potential in a liquid, and at least one first grounding electrode; applying an AC between the pair of AC electrodes; The electrode to be grounded is periodically controlled to apply an alternating current from the ground potential to reduce the oxidation-reduction potential of the liquid. Apply AC Thus, even if the liquid is reformed, that is, the work of generating hydrogen (active hydrogen) and lowering the oxidation-reduction potential of the liquid is performed for a long time, the deposit such as scale is adsorbed to the ground electrode. There is almost no possibility that stable electrolysis of a liquid can be performed over a long period of time, and the oxidation-reduction potential of a liquid such as water is extremely low, that is, more hydrogen is generated in the liquid. In addition, maintenance such as cleaning of the electrodes can be facilitated, and the number of times of maintenance can be reduced.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, the present invention will be described in detail based on specific embodiments.
FIG. 1 shows a first embodiment of AC electrolysis in which a first ground electrode 2 and a pair of application electrodes 3a, 3b are disposed in a liquid (not shown) accommodated in a water tank 1, together with a circuit diagram. FIG. 2 is a schematic plan view in which the first ground electrode 2 is enlarged. The AC electrolysis method according to the present invention is based on the method for reforming water by AC disclosed in Japanese Patent No. 2615308 by the same applicant. An object of the present invention is to prevent the effect of lowering the oxidation-reduction potential of water, that is, the effect of generating hydrogen (active hydrogen), from lowering by making it difficult to adsorb scale or the like.
[0017]
The water tank 1 contains a liquid to be treated. As the first ground electrode 2 having a substantially rectangular shape, for example, a plate material made of a metal such as stainless steel or iron may be used, but platinum is deposited or plated on a mesh-shaped titanium material. Preferably, one is used. The mesh in this case includes diamonds and corners.
[0018]
In addition, as the application electrodes 3a and 3b, for example, a highly soluble metal such as zinc, magnesium, aluminum, copper, iron, nickel or stainless steel, or a non-soluble metal such as titanium, platinum or titanium plated with platinum is used. A metal composed of a stable metal or the like that lowers the oxidation-reduction potential can be used. In particular, it is preferable to use platinum-deposited or plated titanium on a mesh.
[0019]
A high-frequency switch 6a, 6b that converts a DC current from the DC power supply 4 into a high-frequency AC through a variable resistor 5 and applies the DC current to the application electrodes 3a, 3b between the application electrodes 3a, 3b and the DC power supply 4. Is connected. These high-frequency switches 6a, 6b are respectively composed of transistors 7a, 8a and 7b, 8b. The application electrodes 3a, 3b are connected via a capacitor 9, and apply an alternating current between the electrodes of the pair of application electrodes 3a, 3b. The DC power supply 4 can be used while being selectively adjusted within a range of 10 to 50 V according to the use of the liquid such as the treated water.
[0020]
The high-frequency switches 6a and 6b are connected via a resistor 10a and 10b to a high-frequency switching command circuit 11 composed of a flip-flop circuit for giving a high-frequency switching command to the high-frequency switches 6a and 6b. A high-frequency oscillation circuit 12 composed of a voltage controlled oscillator (VCO) whose oscillation frequency changes in response to a control signal is connected. A control circuit 13 having a built-in random voltage generator is connected to the high frequency oscillation circuit 12.
[0021]
The high-frequency oscillation circuit 12 is a variable-frequency oscillation circuit, and can control its oscillation frequency by the voltage value of a control signal supplied to a voltage controlled oscillator (VCO). The variation range of the frequency at this time is, for example, about 3 to 5 KHz above and below the center frequency (about 30 KHz).
[0022]
The control circuit 13 supplies the high-frequency oscillation circuit 12 with a control voltage for controlling the oscillation frequency. The control circuit 13 has a built-in random signal generator and outputs a control signal whose voltage value changes according to a random signal generated by the generator. The shift register 14 (SFR) has a 16-stage configuration, and its stored information can be read in parallel from terminals Q0 to Q15. The shift operation of the shift register 14 (SFR) is controlled by a shift pulse supplied from a pulse generator 15 (PG) to a terminal CK of the shift register 14 (SFR). The flip-flop 16 performs an inversion operation by the pulse of the pulse generator 15, and every time the flip-flop 16 is inverted, the frequency of the portion "I" in FIG.
[0023]
The gate (GT) outputs a signal of “1” if the signals input to both input terminals are the same, and outputs a signal of “0” if the signals are different. This gate performs a so-called exclusive OR operation, and functions as a coincidence detection circuit. One of the input terminals of the gate (GT) receives an even-numbered stage of the shift register 14 (SFR), for example, a signal output from a terminal Q6 of a sixth stage, and the other has an odd-numbered stage, for example, a ninth stage. The signal output from the terminal Q9 is input. The result of the match detection by the gate (GT) is input to the 0th stage, which is the lowest order, from the terminal D of the shift register 14 (SFR). The random number information is stored in the shift register 14 (SFR) by sequentially shifting this information to the higher order.
[0024]
The random number information stored in the shift register 14 (SFR) is extracted by a resistor r from about half of the stages appropriately selected. In this embodiment, signals are extracted from the first, third, eighth, tenth, and twelfth to fifteenth stages. The resistor r connects the terminals Q1, Q3, Q8, Q10, Q12 to Q15 of each stage to a common connection point A. This connection point A is connected to a voltage controlled oscillator (VCO) constituting the high frequency oscillation circuit 12. On the other hand, the voltage controlled oscillator (VCO) is also connected to a flip-flop circuit 16 connected to the pulse generator 15.
[0025]
Therefore, when the pattern of the random number information stored in each of the stages changes, the combined value of the resistor r connected to the high level and the low level changes, and the voltage at the connection point A changes accordingly. Thus, a random signal is created. This operation can be reproduced by the CPU.
[0026]
The pulse generator 15 is configured to transmit a continuous pulse having a center frequency of, for example, 5 Hz, and to change a repetition period of the pulse according to a voltage value of a signal input to a voltage controlled oscillator (VCO). This frequency variation range is about several hertz above and below the center frequency. The voltage of the connection point A is applied to the terminal of the pulse generator 15 via the resistor r2. Therefore, in the pulse generator 15, the repetition period of the pulse fluctuates according to a random signal from the shift register 14 (SFR). The shift register 14 (SFR) uses the output of the pulse generator 15 as a shift pulse. Therefore, the control signal output to the voltage-controlled oscillator (VCO) changes in both the voltage value and the fluctuation period at random, and the flip-flop circuit 16 creates the sudden change I portion shown in FIG. .
[0027]
Here, in the control circuit 13, the control signal is created using the pattern of the random number information accumulated in about half of the stages of the shift register 14 (SFR), and the adoption stages are also biased. Further, as described above, since the coincidence detection result of the information selected one stage at a time from each of the even number and the odd number is used as the input information of the shift register 14 (SFR), the voltage value suddenly rises and falls extremely. Frequently fluctuating parts frequently appear, and the same change pattern is not repeated in a short period of time.
[0028]
When the switch of the DC power supply 4 of the AC electrolysis apparatus configured as described above is turned on, the control circuit 13 operates as described above, and a control signal corresponding to the random signal is transmitted to the high-frequency oscillation circuit 12, The oscillation frequency is controlled and changes randomly. Then, a high-frequency signal that changes at random is supplied from the high-frequency oscillation circuit 12 to the high-frequency switching command circuit 11. When a random high-frequency signal is given to the high-frequency switching command circuit 11, a high-frequency switching command is issued from the high-frequency switching command circuit 11, and is given to the high-frequency switches 6a and 6b alternately. A high-frequency alternating current that is turned on and off and changes at random is formed, and is applied alternately to a pair of application electrodes 3a and 3b arranged in the liquid in the water tank 1.
[0029]
Here, the oscillation frequency sent from the high-frequency oscillation circuit 12 varies very randomly, as shown in FIG. 3, and its voltage value and the duration of the voltage value change very randomly, and the voltage value rises rapidly and then drops sharply. Often contains parts that do.
[0030]
As described in Japanese Patent No. 3337422, when the transmission frequency is changed in this way, it is visually confirmed that white deposits on the electrode surface are significantly less than when the transmission frequency is not changed. Bubbles such as oxygen and hydrogen generated by the pair of application electrodes 3a and 3b become fragmented, and the oxidation-reduction potential, that is, the generated hydrogen is stabilized for a long time. Can be saved.
[0031]
In short, since the amount of white deposits on the electrode surface can be reduced, the effect of lowering the oxidation-reduction potential of water can be prevented from being reduced even when used for a long time, that is, hydrogen is generated stably for a long time. As a result, the amount of generated hydrogen can be increased. Therefore, an alternating current may be simply applied, but it is better to change the transmission frequency in the same manner as in Japanese Patent No. 3337422.
[0032]
The method of changing the transmission frequency according to the present invention is not limited to the above-described method, and for example, the transmission frequency may be controlled and changed by a computer or the like.
[0033]
As described above, the alternating current is applied between the pair of application electrodes 3a and 3b, the first ground electrode 2 is grounded, and the liquid is electrolyzed with the alternating current, so that
2H ₂ O + 2e = 2OH ⁻ + H ₂
Is caused, and the oxidation-reduction potential of the liquid can be lowered.
[0034]
In this case, in the liquid AC electrolysis apparatus of the present invention, it is preferable that the first ground electrode 2 is formed by forming a titanium material having a substantially rectangular shape in a mesh shape and depositing or plating platinum. However, it is also possible to use a highly soluble metal such as zinc, magnesium, aluminum, copper, iron, nickel or stainless steel, or a non-soluble stable metal such as titanium or platinum.
[0035]
Since titanium and platinum are stable metals without solubility, they do not dissolve in liquids.In addition, titanium has excellent corrosion resistance and durability, and platinum does not form an oxidized film on its surface. Therefore, stable AC electrolysis can be performed over a long period of time.
[0036]
Further, by forming the first ground electrode 2 in a mesh shape, it is possible to reduce the amount of platinum used for vapor deposition or plating and to lower the oxidation-reduction potential of the liquid, that is, to increase the amount of generated hydrogen. The efficiency of the electrolysis is increased, and the time required for the AC electrolysis is reduced. Although the detailed mechanism has not been elucidated, when the first ground electrode 2 is formed in a mesh, the movement of the electrons is more than in the case where the first ground electrode 2 is formed in a plate shape because the first ground electrode 2 is formed in a mesh. It is presumed to be performed smoothly.
[0037]
Further, the size of the mesh is related to the AC frequency, and when a high frequency of approximately 30 KHz to 60 KHz is used, the size of the mesh can be approximately 10 × 20 mm square, and the first ground electrode 2 is The material can be reduced to about 1/20 as compared with the case where it is formed in a plate shape, and the cost can be reduced.
[0038]
The first ground electrode 2 is connected to a timer circuit 17 using a pulse signal. The timer circuit 17 is connected to a grounded electrode of the DC power supply 4 and a circuit to which AC can be applied.
[0039]
As the circuit that can apply the alternating current, any circuit that can apply an alternating current such as an AC transmitter (not shown) may be used, but in FIG. 1, in order to simplify the circuit configuration, And a circuit capable of applying the same alternating current to the pair of application electrodes 3a and 3b, for example, connected to one of the pair of application electrodes 3a and 3b for synchronization, and grounded by a pulse signal of the timer circuit 17. And the electrode to which the same alternating current as the pair of application electrodes 3a, 3b is applied, and the potential of the first ground electrode 2 is periodically changed from the ground potential to the pair of application electrodes 3a, 3b. And the same AC potential.
[0040]
As described above, by applying an alternating current such as temporarily setting the potential of the first ground electrode 2 to the same AC potential as that of the pair of application electrodes 3a and 3b, the first ground electrode 2 Since the scale and the like adsorbed on the surface can be removed for cleaning, the amount of generated hydrogen can be increased without reducing the amount of hydrogen generated from the first ground electrode 2.
[0041]
The time for applying the alternating current to the first ground electrode 2 periodically from the ground potential may be shorter than the time for which the first ground electrode 2 is grounded. On the other hand, a time of approximately 1/10 to 1/1000, for example, approximately 10 seconds when the AC is applied when the grounding state is approximately 20 minutes is sufficient. By cleaning the first ground electrode 2 in this way, it is possible to further prevent adhesion of scale and the like, and to maintain the efficiency of AC electrolysis higher.
[0042]
That is, while the first ground electrode 2 is being cleaned, that is, while the alternating current is being applied to the first ground electrode 2, the electrolysis of the liquid is very small. By cleaning 2, the efficiency of the electrolysis after the cleaning can be increased, so that the time for reforming the liquid can be shortened.
[0043]
Further, by applying an alternating current to the first ground electrode 2, the first ground electrode 2 does not dissolve, so that the first ground electrode 2 is made of a non-soluble metal such as titanium or platinum. In addition, even if a highly soluble metal such as zinc, magnesium, aluminum, copper, iron, nickel or stainless steel is used, the problem that the first ground electrode 2 is dissolved does not occur. .
[0044]
FIG. 4 shows a second embodiment in which a substantially box-shaped second ground electrode 18 is used. In the second embodiment, the second ground electrode 18 is disposed around the first ground electrode 2 in the water tank 1 and the pair of application electrodes 3a and 3b, and the first ground electrode 18 is provided in the first tank. In this embodiment, the circuit for controlling the frequency is omitted, and an AC oscillator 19 (OSC) is connected instead. The other circuit configuration is the same as that of the first embodiment. The description is omitted because it overlaps. Therefore, in the second embodiment, the circuit for controlling the frequency of the first embodiment may be used in place of the oscillator 19.
[0045]
The second ground electrode 18 is formed in a substantially box shape, and can be made of a metal such as zinc, magnesium, aluminum, copper, iron, nickel, stainless steel, titanium, or platinum. And platinum deposited or plated thereon, and the mesh in this case includes diamonds and corners.
[0046]
As shown in the second embodiment, since it is sufficient that an alternating current can be applied between the pair of AC electrodes 3a and 3b, the transmitter 19 or the like may be used as a circuit for applying the alternating current. When a circuit for controlling the frequency is used as in the first embodiment, the effect of lowering the oxidation-reduction potential of the liquid can be enhanced.
[0047]
【The invention's effect】
As described above, the AC electrolysis method according to the first aspect of the present invention includes a pair of AC electrodes made of a metal that reduces the oxidation-reduction potential in a liquid, and at least one first grounded electrode. Disposing an alternating current between the pair of alternating current electrodes, and controlling the first grounded electrode to periodically apply an alternating current from a ground potential to lower the oxidation-reduction potential of the liquid. Therefore, when reforming the liquid, a chemical such as a reducing agent is not required, and the reforming of the liquid, that is, when the liquid is subjected to AC electrolysis to generate hydrogen and lower the oxidation-reduction potential of the liquid, In addition, the effect of reducing the adsorption of scale and the like to the electrode, particularly the ground electrode, and the effect of lowering the oxidation-reduction potential of water, that is, the effect of generating hydrogen, can be prevented from being reduced. When using highly soluble metals as I also exhibits an excellent effect that the first ground electrode can be prevented from dissolving.
[0048]
Further, an AC electrolysis apparatus according to a second invention of the present invention includes a pair of AC electrodes made of a metal for lowering an oxidation-reduction potential in a liquid, and at least one first electrode to be grounded. AC is applied between the AC electrodes of the liquid crystal, and the first grounded electrode is controlled so as to periodically apply the AC from the ground potential to lower the oxidation-reduction potential of the liquid. When the reforming of the liquid does not require a chemical such as a reducing agent or the like, the reforming of the liquid, that is, when the liquid is subjected to AC electrolysis to generate hydrogen and lower the oxidation-reduction potential of the liquid, the ground electrode In addition to reducing the adsorption of scale and the like, the adsorption of the scale and the like at the application electrode can be reduced, and the effect of lowering the oxidation-reduction potential of water, that is, the effect of generating hydrogen is prevented from being reduced. Can be Even when using a high solubility metal as a ground electrode, an excellent effect of being able to have the first ground electrode does not dissolve.
[0049]
Therefore, regardless of the invention of the liquid AC electrolysis method or apparatus according to the present invention, when performing liquid reforming, chemicals such as reducing agents are not required, and liquid reforming, that is, liquid When AC is electrolyzed to generate hydrogen to lower the oxidation-reduction potential of the liquid, the ground electrode is periodically applied with an alternating current from the ground potential so that even when used for a long time. It is possible to prevent adhering matter such as scale from adsorbing to the ground electrode, and it is possible to stably perform electrolysis of the liquid over a long period of time, and to extremely reduce the oxidation-reduction potential of the liquid, that is, to reduce hydrogen. Can be increased, the efficiency of AC electrolysis can be increased, and the time required for electrolysis can be shortened. Further, the burden of maintenance such as electrode cleaning can be reduced, and the first grounded electrode can be used. Prevents dissolution An excellent effect that it is possible.
[Brief description of the drawings]
FIG. 1 is a diagram showing an AC electrolysis apparatus using a substantially rectangular ground electrode according to an embodiment of the present invention, together with a circuit diagram.
FIG. 2 is a schematic plan view in which the substantially rectangular ground electrode is enlarged.
FIG. 3 is a diagram showing a change in a control frequency sent from a control circuit in the embodiment.
FIG. 4 is a diagram showing an AC electrolysis apparatus using a substantially box-shaped ground electrode according to an embodiment of the present invention, together with a circuit diagram.
[Explanation of symbols]
Reference Signs List 1 Water tank 2 First ground electrode 3a, 3b Applied electrode 4 DC power supply 5 Variable resistor 6a, 6b High frequency switch 7a, 7b, 8a, 8b Transistor 9 Capacitor 10a, 10b Resistance 11 High frequency switching command circuit 12 High frequency oscillation circuit 13 Control circuit 14 shift register 15 pulse generator 16 flip-flop circuit 17 timer circuit 18 second ground electrode 19 oscillator

Claims (14)

A pair of AC electrodes made of a metal for lowering an oxidation-reduction potential in a liquid, and at least one first electrode to be grounded; an AC applied between the pair of AC electrodes; A method for controlling the electrode to be grounded to periodically apply an alternating current from the ground potential to lower the oxidation-reduction potential of the liquid. The alternating current applied to the first grounded electrode is:
2. The method according to claim 1, wherein the method is synchronized with one of the alternating currents applied to the pair of alternating current electrodes. The alternating current applied to the first grounded electrode is:
The method according to claim 1 or 2, wherein the liquid is applied for 1/10 to 1/1000 of the grounding time. The first grounded electrode comprises:
The method according to any one of claims 1 to 3, wherein the liquid is formed in a mesh shape having a substantially rectangular shape. Around the pair of AC electrodes and the first grounded electrode,
The method according to any one of claims 1 to 4, wherein a mesh-like second grounding electrode having a substantially box shape is provided. The pair of AC electrodes,
The method according to claim 1 or 5, wherein platinum is deposited or plated on the titanium material. 2. The method according to claim 1, wherein the frequency of the alternating current applied to the pair of alternating current electrodes is controlled. A pair of AC electrodes made of a metal for lowering an oxidation-reduction potential in a liquid, and at least one first grounding electrode; applying an AC between the pair of AC electrodes; A liquid AC electrolysis apparatus characterized in that an electrode to be applied is periodically controlled to apply an alternating current from a ground potential to lower the oxidation-reduction potential of the liquid. The alternating current applied to the first grounded electrode is:
The liquid AC electrolysis apparatus according to claim 8, wherein the apparatus is synchronized with one of the ACs applied to the pair of AC electrodes. The alternating current applied to the first grounded electrode is:
The liquid AC electrolysis apparatus according to claim 8 or 9, wherein the duration is set at 1/10 to 1/1000 of the grounding time. The first grounded electrode comprises:
The liquid AC electrolysis apparatus according to any one of claims 8 to 10, wherein the apparatus is formed in a mesh shape having a substantially rectangular shape. Around the pair of AC electrodes and the first grounded electrode,
The liquid AC electrolysis apparatus according to any one of claims 8 to 11, further comprising a mesh-like second grounding electrode having a substantially box shape. The pair of AC electrodes,
13. The liquid AC electrolysis apparatus according to claim 8, wherein platinum is deposited or plated on the titanium material. 9. The liquid AC electrolysis apparatus according to claim 8, wherein an AC frequency applied to the pair of AC electrodes is controlled.

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