JP2003181461A - Water treatment apparatus and water treatment method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water treatment apparatus and a water treatment method which enables easy and proper control of supply quantity of chlorine for disinfection with respect to water to be treated. <P>SOLUTION: Electrodes 11, 12, electrodes 13, 14 and electrodes 15, 16 in a treated water tank 10 respectively constitute a pair of electrodes and electric power is supplied from an electric source 51 thereto. A controller 50 controls the operation of the electric source 51 and, thereby, electric power supplied to the respective pairs of electrodes and a quantity of current flowing between the electrodes are controlled. The controller 50 calculates the difference between oxidation-reduction potentials measured by a second ORP (oxidation-reduction potential) meter 31 and a first ORP meter 21. Then, the value of the difference is compared with the reference value which differs in accordance with PH value of water to be treated measured by a PH meter 60 and, based on the comparison result, the value of current flowing between the respective pairs of electrodes is controlled. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water treatment device and a water treatment method, and more particularly to a water treatment device and a water treatment method for disinfecting waste water with a chlorine-based compound.

[0002]

2. Description of the Related Art Conventionally, in a wastewater treatment system including a combined treatment septic tank for household use, in order to ensure safety, disinfection is performed with discharged water so as to meet a standard of 3000 coliform bacteria / mL or less. Came. In many treatment facilities, disinfection is based on constraints such as maintenance frequency.
This was done by adding a chlorine-based solid disinfectant. As a result, disinfection was performed at a relatively low cost.

[0003]

However, in disinfection by adding a disinfectant, it is difficult to strictly control the amount added, so in many cases, in order to satisfy the above-mentioned criteria for the coliform group number, The disinfectant was added more than necessary. If a large amount of disinfectant is added, excessive disinfection of the treated water will result in an excessive amount of chlorine compounds remaining in the discharged water, which will cause trihalomethane generation and the ecology of the discharge destination of the wastewater treatment system. It is possible that the system will be affected in some way.

The present invention has been conceived in view of such circumstances, and an object thereof is to provide a water treatment apparatus and a water treatment method capable of easily and appropriately controlling the supply amount of chlorine for disinfection. That is.

[0005]

According to an aspect of the present invention, there is provided a water treatment device, which contains a container for containing water to be treated, an electrode pair which is a pair of electrodes immersed in the container, A power supply for applying a voltage to the electrode pair, a redox potential measuring unit for measuring the redox potential of the water to be treated in the housing, and a current value flowing between the electrodes of the electrode pair is measured by the redox potential measuring unit. And a power supply control unit that controls the output of the power supply so that the value corresponds to the result.

According to one aspect of the present invention, when a voltage is applied to the pair of electrodes, chlorine ions contained in the water to be treated are electrolyzed and converted to hypochlorous acid through chlorine gas to serve as a disinfectant. To work. The amount of residual chlorine in the water to be treated is related to the redox potential of the water to be treated. In other words, by controlling the current value between the electrodes based on the oxidation-reduction potential without performing complicated work such as observing the color of the solution when adding the indicator to detect the residual chlorine amount, The supply amount of chlorine can be controlled so that the residual amount of chlorine is not excessive.

As a result, the amount of chlorine supplied to the water to be treated can be controlled easily and appropriately in the water treatment device.

A water treatment apparatus according to another aspect of the present invention is
A storage unit for storing the water to be treated, and immersed in the storage unit,
An electrode pair composed of a pair of electrodes, a power source for applying a voltage to the electrode pair, an oxidation-reduction potential measurement unit for measuring the oxidation-reduction potential of the water to be treated in the containing portion, and the water to be treated in the containing portion. The current value flowing between the pH measuring unit for measuring pH and the electrode of the electrode pair is set to a value corresponding to the measurement result of the pH measuring unit and the measurement result of the oxidation-reduction potential measuring unit. And a power supply control unit for controlling output.

According to another aspect of the present invention, when a voltage is applied to the pair of electrodes, chlorine ions contained in the water to be treated are electrolyzed and converted to hypochlorous acid through chlorine gas to disinfect. Acts as an agent. The amount of residual chlorine in the water to be treated is related to the redox potential of the water to be treated, and is also related to the pH when the pH of the water to be treated changes. That is, by controlling the current value between the electrodes based on the oxidation-reduction potential and pH without performing complicated work such as observing the color of the solution when an indicator is added to detect the residual chlorine amount, The supply amount of chlorine can be controlled so that the residual amount of chlorine in the treated water does not become excessive.

As a result, in the water treatment apparatus, even when the pH value of the water to be treated is unknown, the amount of chlorine supplied to the water to be treated can be easily and appropriately controlled.

Further, in the water treatment apparatus of the present invention, the oxidation-reduction potential measuring section includes, in the accommodating section, an inflowing portion of the treated water into the accommodating section and an outflowing portion of the treated water from the accommodating section. Then, it is preferable to measure the redox potential.

Thus, the redox potential of the water to be treated can be measured at a plurality of points. Therefore, the chlorine supply amount in the water to be treated can be controlled more surely so that the residual amount becomes appropriate.

Further, in the water treatment apparatus of the present invention, the power supply control section uses the difference between the redox potential of the inflow section and the redox potential of the outflow section as the measurement result of the redox potential measuring section. Is preferred.

This makes it possible to measure the change in the redox potential of the water to be treated before and after the electrolysis in the accommodating portion.
Therefore, the chlorine supply amount in the water to be treated can be controlled more surely so that the residual amount becomes appropriate.

Further, in the water treatment apparatus of the present invention, the oxidation-reduction potential measuring section includes a measurement member for measuring the oxidation-reduction potential of the outflow portion, and is installed between the measurement member and the electrode. It is preferable to further include an aeration member for aeration of the water to be treated.

As a result, the hydrogen gas produced by the electrolysis of water by applying a voltage to the electrode pair influences the redox potential of the water to be treated, which is a measure of the residual amount of chlorine compounds. Can be avoided. Therefore, the chlorine supply amount in the water to be treated can be controlled more surely so that the residual amount becomes appropriate.

A water treatment method according to still another aspect of the present invention is a water treatment method in which an electrode pair is immersed in water to be treated and a voltage is applied to the electrode pair to treat the water to be treated. The step of measuring the oxidation-reduction potential of the water to be treated, and the current value flowing between the electrodes of the electrode pair so that the output of the power supply is set to a value corresponding to the measurement result of the oxidation-reduction potential of the water to be treated. And a step of controlling

According to still another aspect of the present invention, when a voltage is applied to the electrode pair, chlorine ions contained in the water to be treated are electrolyzed and converted to hypochlorous acid through chlorine gas to disinfect. Acts as an agent. The amount of residual chlorine in the water to be treated is related to the redox potential of the water to be treated.
In other words, by controlling the current value between the electrodes based on the oxidation-reduction potential without performing complicated work such as observing the color of the solution when adding the indicator to detect the residual chlorine amount, The supply amount of chlorine can be controlled so that the residual amount of chlorine is not excessive.

Thus, the amount of chlorine supplied to the water to be treated can be controlled easily and appropriately. A water treatment method according to another aspect of the present invention is a water treatment method in which an electrode pair is immersed in water to be treated, and the water to be treated is applied by applying a voltage to the electrode pair. The step of measuring the redox potential of water, the step of measuring the pH of the water to be treated, and the current value flowing between the electrodes of the electrode pair correspond to the measurement results of the pH and the redox potential of the water to be treated. The step of controlling the output of the power source so as to obtain the above value.

According to another aspect of the present invention, when a voltage is applied to the electrode pair, the chlorine ions contained in the water to be treated are electrolyzed and converted to hypochlorous acid via chlorine gas to disinfect. Acts as an agent. The amount of residual chlorine in the water to be treated is related to the redox potential of the water to be treated, and is also related to the pH when the pH of the water to be treated changes. That is, by controlling the current value between the electrodes based on the oxidation-reduction potential and pH without performing complicated work such as observing the color of the solution when an indicator is added to detect the residual chlorine amount, The supply amount of chlorine can be controlled so that the residual amount of chlorine in the treated water does not become excessive.

Thus, even when the pH value of the water to be treated is unknown, the amount of chlorine supplied to the water to be treated can be controlled easily and appropriately.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 schematically shows a water treatment device. In the water treatment apparatus, the treated water that has been treated in the anaerobic tank and the aerobic tank is introduced into the treated water tank 10, and the electrodes 11 to 16 are immersed in the treated water. Electrode 11 and electrode 12, electrode 13 and electrode 14, electrode 15 and electrode 16
, Each of which constitutes an electrode pair. That is, the water treatment device of FIG. 1 includes three electrode pairs. In the water treatment device of the present invention, the number of electrode pairs is not limited. Electrode 1
Power is supplied from the power supply 51 to the power supplies 1 to 16. Power supply 51
However, when the operation is controlled by the controller 50, the electric power supplied to the electrode pairs of the electrode 11 and the electrode 12, the electrode 13 and the electrode 14, the electrode 15 and the electrode 16 and the current value flowing between the electrodes can be controlled. Controlled.

The treated water tank 10 has an inflow port 10A and an outflow port 1
With 0B. The water to be treated is introduced into the treated water tank 10 through the inflow port 10A and discharged from the treated water tank 10 through the outflow port 10B. An electric potential detection tank 20 is provided on the upstream side of the inflow port 10A and on the downstream side of the outflow port 10B, respectively.
30 are provided. Each of the potential detection tanks 20 and 30 has a first ORP (oxidation-reduction potentia).
l) A total of 21 and a second ORP total 31 are installed. OR
P is for measuring the redox potential of the water to be treated.
The detection outputs of the first ORP meter 21 and the second ORP meter 31 are input to the controller 50.

An aeration tank 40 is provided between the outlet 10B of the treated water tank 10 and the potential detection tank 30. An aeration member 41 is installed in the aeration tank 40.
The aeration member 41 aerates the inside of the aeration tank 40 by introducing air from the blower 42.

In the present embodiment, in the water treatment apparatus shown in FIG. 1, the controller 50 controls the oxidation-reduction potential of the treated water measured by the first ORP meter 21 and the oxidation of the treated water measured by the second ORP meter 31. Based on the difference from the reduction potential, the electrode 11
Controls the electrolytic current value between the electrodes of each electrode pair constituted by ˜16. Hereinafter, this control mode will be described.

First, referring to FIG. 2, the amount of chlorine added when actual wastewater is introduced into the water treatment apparatus of FIG. 1 as treated water and a chlorine-based disinfectant is added to the treated water, The relationship between the residual amount of chlorine compounds in the water to be treated and the redox potential of the water to be treated will be described. In FIG. 2, the horizontal axis represents the amount of chlorine added to the water to be treated, and the vertical axis represents the total residual chlorine amount (◆).
Free residual salt amount (⋄) and ORP change amount (solid line only) are taken. The amount of chlorine added means the amount added as chlorine simple substance (chlorine atom and chlorine ion), and the added amount of chlorine-based disinfectant is converted into the added amount of chlorine single substance. The amount of free residual salt is the amount of hypochlorous acid and hypochlorite ion in the water to be treated, and the total residual chlorine amount is the amount of free residual salt and bound chlorine (chlorine, etc., combined with nitrogen compounds). ) And the total amount. In addition, the ORP change amount is calculated from the voltage value measured by the second ORP meter 31 to the first ORP meter 2
1 minus the measured voltage value.

Referring to FIG. 2, as the amount of chlorine added increases, the total residual chlorine amount, the amount of free residual salt, and the ORP change amount increase. Further, when the chlorine addition amount is 1 to 3 mg / L, the total residual chlorine amount is about 1 mg / L.

That is, from the viewpoint of the total residual chlorine amount in the water to be treated, the chlorine addition amount is suitable to be about 1 to 3 mg / L, and the ORP change amount depends on the chlorine addition amount. Change.

Next, referring to FIG. 3, depending on the amount of chlorine added when the actual wastewater is introduced into the water treatment apparatus of FIG. 1 as treated water and a chlorine-based disinfectant is added to the treated water. The difference in the change with time of the number of coliform bacteria in the treated water will be explained. In FIG. 3, the horizontal axis represents the time elapsed since the disinfectant was added, and the vertical axis represents the logarithm of the reduction rate of coliform bacteria. In addition, the logarithm of the reduction rate of the coliform group is N1 when the elapsed time is 0 (that is, when the disinfectant is added), N1.
Is the number of coliforms after the corresponding elapsed time, Log
It is represented by (N1 / N0). Further, in FIG. 3, the case where the amount of chlorine added is 3 mg / L is shown by a solid line, and the case where the amount of chlorine added is 1 mg / L is shown by a broken line. The amount of chlorine added is the same as in FIG.

Referring to FIG. 3, as the amount of chlorine added increases, the rate of decrease in the number of coliforms increases in a shorter time. In other words, when comparing 15 minutes after the addition of chlorine, the logarithm of the reduction rate of coliforms is 3 mg /
In the case of L, about "-3" (that is, the number of coliform bacteria is 1/1
000), and when the amount added is 1 mg / L, it is about "-1" (that is, the number of coliforms has been reduced to about 1/10).

As described with reference to FIG. 2, it is said that the method is suitable for disinfection from the viewpoint of the total residual chlorine amount. When the added amount of chlorine is 1 to 3 mg / L, the reduction rate of the coliform group is considered. Therefore, it can be said that it is suitable for disinfection.

The water to be treated shown in FIGS. 2 and 3 is usually adjusted to pH 7, which is the same as the water to be treated in the water treatment device. Then, referring to FIG. 4, the relationship between the addition amount of the chlorine-based disinfectant, the remaining amount of the chlorine-based compound in the water to be treated, and the oxidation-reduction potential of the water to be treated is as follows.
Consider how it changes with the pH of the solution.

FIG. 4 shows the result of an experiment for carrying out the above consideration. Specifically, in a phosphate buffer solution having a pH adjusted to 5 to 8, the amount of chlorine added in the buffer solution is plotted on the horizontal axis and the vertical axis is plotted on the vertical axis, the amount of free residual salt at each pH (pH = 5, 6). , 7, 8
◇, ○, △, □), the total residual chlorine amount for each pH (◆, etc., the symbols used for the residual residual salt amount for each pH are shown in black), and each pH Of ORP (only line, solid line for pH5, broken line for pH6, one-dot chain line for pH7, two-dot chain line for pH8).

With reference to FIG. 4, regarding the total residual chlorine amount and the amount of free residual salt, there is almost no difference in the behavior when the chlorine addition amount changes, even if the pH of the solution changes. on the other hand,
Regarding the ORP change amount, the chlorine addition amount of 1 to 3 mg /
Differences are seen as the pH of the solution changes at and around L. For example, the total residual chlorine content is 1 mg
In the case of / L, the ORP change amount is about 300 mV, which is the highest value in the solution of pH 6, and then the pH of 5
And the solution of pH 7 show almost the same value of 250 mV to 300 mV, and the solution of pH 8 shows 200 mV.
The value is below V.

Incidentally, referring to FIG. 2 and FIG.
Considering the ORP change amount in the case where the total residual chlorine amount in 1 is 1 mg / L, the ORP change amount in the treated water (Fig. 2)
Shows a lower value than the ORP change amount in the phosphate buffer (FIG. 4). That is, although the ORP change amount in the phosphate buffer solution adjusted to each pH is shown in FIG. 4, it is considered that the ORP change amount at each pH shows a slightly low value in the water to be treated.

From the above-described experimental results using the water to be treated or the phosphate buffer solution, in the water treatment apparatus of this embodiment, the ORP change amount (the water to be treated containing chlorine for disinfection was It is considered that the difference between the ORP values before and after the electrolyzed treated water tank 10) changes according to the total residual chlorine amount when the amount of chlorine required for disinfection is contained in the water to be treated. In addition, the ORP change amount in such a case is also shown in the treated water based on the experimental results obtained with the phosphate buffer solution.
It is considered to be affected by the pH of the water to be treated.

Therefore, in the water treatment apparatus of the present embodiment, when treating domestic wastewater, which is considered to have a pH of about 7 and does not change significantly, the controller 50 controls the output of the power source 51 when The processing as shown in FIG. 5 is executed.

Referring to FIG. 5, first, the controller 50 sets S
In step 1, the redox potential measured by the first ORP meter 20 is subtracted from the redox potential measured by the second ORP meter 30 to obtain the difference between the measured values of these ORP meters (the above-mentioned OR
P change amount. Hereinafter, it is also described as ΔORP).

Next, the controller 50 determines whether or not ΔORP is 250 mV or more in S2. This 250m
V is a value derived from the water to be treated having a pH of 7 and the results of experiments in a phosphate buffer solution, and the amount of chlorine that is considered suitable from the viewpoints of the reduction rate of coliform bacteria and the total residual chlorine amount. It is the ORP change amount when added. In addition, as an example of a method of calculating this value, specifically, from FIGS.
It is calculated as an average of the ORP change amount in the phosphate buffer solution and the ORP change amount in the waste water adjusted to the same pH when the total residual chlorine amount is 1 mg / L.

Then, the controller 50 makes the ΔORP in S2.
If it is determined that the voltage is 250 mV or more, the electrode 1
Power supply 5 to reduce the electrolysis current in 1-16
After controlling 1, the process proceeds to S5. On the other hand, in S2,
When it is judged that the ORP is less than 250 mV, S4
Then, after controlling the power supply 51 so as to increase the electrolysis current in the electrodes 11 to 16, the process proceeds to S5.

The controller 50 determines in S5 whether or not an operation for ending the water treatment in the water treatment apparatus shown in FIG. 1 has been performed from the outside. If it is determined that such an operation has not been performed yet, the process returns to S1. On the other hand, if it is determined that such an operation has been performed, the processing is ended.

As described above, in the water treatment apparatus of the present embodiment, when it is considered that the pH of the treated water is stable, the ORP value of the treated water is changed as shown in FIG. The value of the current flowing between the electrodes of the electrode pair is controlled based on

Further, in this embodiment, the difference between the ORP values on the outflow side and the inflow side of the treated water tank 10 is used as the ORP value. As a result, it is possible to constantly control the amount of residual chlorine in the water to be treated. That is, as described above, by adopting the difference of the ORP value as the control target, the control based on the residual chlorine amount can be performed regardless of the ORP value of the water to be treated itself.

On the other hand, when the water treatment apparatus of the present embodiment uses special wastewater as the water to be treated, such as the wastewater of a plating factory or a food factory, the pH of the solution is also taken into consideration in the electrode pair. Modifications are preferably made to control the amount of current flowing in between.

Since the aeration tank 40 is provided between the treated water tank 10 and the potential detection tank 30, the treated water tank 1
Hydrogen gas produced when water is electrolyzed in
The influence on the ORP value measured by the P meter 31 is avoided.

FIG. 6 is a diagram showing a modification of the water treatment device of FIG. In the water treatment device shown in FIG. 6, the pH meter 60 is immersed in the water to be treated in the potential detection tank 30 of the water treatment device shown in FIG. The detection output of the pH meter 60 is introduced into the controller 50. As a result, the controller 50 can control the output of the power supply 51 according to the pH of the water to be treated. Hereinafter, a control mode of the power source 51 of the controller 50 based on the ORP value and the pH of the water to be treated will be described with reference to FIG. 7.

First, in S11, the controller 50 causes the second OR
From the redox potential measured by the P meter 31, the first ORP meter 21
The difference between the measured values of these ORP meters is calculated by subtracting the measured redox potential of.

Next, the controller 50 determines in S12 whether or not the pH of the water to be treated is 5.5 or less, and if it is 5.5 or less, the process goes to S13 and exceeds 5.5. If so, the process proceeds to S14.

At S13, the controller 50 sets the ΔORP to 25.
It is judged to be 0 mV or higher. Then, if it is determined that the voltage is 250 mV or higher, in S20, after controlling the power supply 51 to reduce the electrolysis current in the electrodes 11 to 16,
The process proceeds to S21. On the other hand, if it is determined that the voltage is less than 250 mV, in S19, the power supply 51 is controlled to increase the electrolysis current in the electrodes 11 to 16, and then the process proceeds to S21.

Next, the controller 50 determines in S14 whether or not the pH of the water to be treated is 6.5 or less, and if it is 6.5 or less, the process goes to S15, where it exceeds 6.5. If so, the process proceeds to S16.

At S15, the controller 50 sets the ΔORP to 28.
It is judged to be 5 mV or more. If it is determined that the voltage is 285 mV or higher, in S20, after controlling the power supply 51 to reduce the electrolysis current in the electrodes 11 to 16,
The process proceeds to S21. On the other hand, if it is determined that the voltage is less than 285 mV, the power source 51 is controlled to increase the electrolysis current in the electrodes 11 to 16 in S19, and then the process proceeds to S21.

Next, the controller 50 determines in S16 whether or not the pH of the water to be treated is 7.5 or less, and if it is 7.5 or less, the process proceeds to S17, where the value exceeds 7.5. If so, the process proceeds to S18.

At S17, the controller 50 sets the ΔORP to 23.
It is judged to be 5 mV or more. If it is determined that the voltage is 235 mV or higher, in S20, after controlling the power supply 51 to reduce the electrolysis current in the electrodes 11 to 16,
The process proceeds to S21. On the other hand, if it is determined that the voltage is less than 235 mV, in S19, the power supply 51 is controlled to increase the electrolysis current in the electrodes 11 to 16, and then the process proceeds to S21.

At S18, the controller 50 sets the ΔORP to 17
It is judged to be 0 mV or higher. Then, if it is determined that the voltage is 170 mV or more, in S20, after controlling the power supply 51 to reduce the electrolysis current in the electrodes 11 to 16,
The process proceeds to S21. On the other hand, if it is determined that the voltage is less than 170 mV, in S19, the power supply 51 is controlled to increase the electrolysis current in the electrodes 11 to 16, and then the process proceeds to S21.

In step S21, the controller 50 is operated from the outside as shown in FIG.
It is determined whether or not an operation for ending the water treatment in the water treatment apparatus shown in (3) is performed. If it is determined that such an operation has not been performed yet, the process returns to S11. On the other hand, if it is determined that such an operation has been performed, the processing is ended.

As described above, in the water treatment apparatus of FIG. 6, the current value flowing between the electrodes of the electrode pair is controlled based on the reference value of the ΔORP value which varies depending on the pH of the water to be treated. The standard value of △ ORP value is 250 m near pH 5.
V (S13), 285 mV (S15) near pH6,
It is 235 mV (S17) near pH7 and 170 mV (S18) near pH8.

The reference value at each pH is a value derived from an experimental result in a phosphate buffer solution, and an amount of chlorine which is considered appropriate from the viewpoint of the reduction rate of coliform bacteria and the total residual chlorine amount is added. It is the amount of ORP change when it is performed. In addition,
These reference values are specifically considered to be such that the ORP change amount at each pH of the water to be treated is lower than the ORP change amount in the corresponding phosphate buffer solution, so that the total residual chlorine amount is 1 mg.
It is calculated as the average of the ORP change amount in the phosphate buffer solution and the ORP change amount in the waste water adjusted to the same pH when the value becomes / L.

The embodiments disclosed this time are to be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description but by the claims, and is intended to include meanings equivalent to the claims and all modifications within the scope.

[Brief description of drawings]

FIG. 1 is a diagram schematically showing a water treatment device according to a first embodiment of the present invention.

FIG. 2 is a diagram for explaining the relationship between the amount of chlorine-based disinfectant added, the remaining amount of chlorine-based compounds in the water to be treated, and the redox potential of the water to be treated.

FIG. 3 is a diagram for explaining the difference in the change over time in the number of coliform bacteria in the water to be treated depending on the amount of chlorine added.

FIG. 4 is a diagram for explaining the influence of the pH of the solution on the relationship between the amount of the chlorine-based disinfectant added, the remaining amount of the chlorine-based compound in the solution, and the redox potential of the solution.

5 is a diagram showing an example of processing executed by the controller of FIG.

FIG. 6 is a diagram showing a modification of the water treatment device of FIG. 1.

FIG. 7 is a diagram showing an example of processing executed by the controller of FIG.

[Explanation of symbols]

10 treated water tank, 11 to 16 electrodes, 20, 30 potential detection tank, 21 first ORP meter, 31 second ORP meter, 4
0 aeration tank, 41 aeration member, 42 blower, 50
Controller, 51 power supply, 60 pH meter.

Front page continuation (51) Int.Cl. ⁷ Identification code FI theme code (reference) C02F 1/50 C02F 1/50 550L 1/46 1/46 Z 1/76 1/76 A G01N 27/26 361 G01N 27 / 26 361E 27/416 27/46 351K F term (reference) 4D050 AA15 AB06 BB04 BD04 BD08 CA10 CA20 4D061 DA08 DB01 DB10 EA02 EB01 EB04 EB14 EB20 EB37 EB39 FA20 GA07 GA08 GA23 GC12

Claims (7)

[Claims] 1. An accommodating portion for accommodating water to be treated, an electrode pair formed of a pair of electrodes immersed in the accommodating portion, a power source for applying a voltage to the electrode pair, and water to be treated in the accommodating portion. An oxidation-reduction potential measurement unit for measuring the oxidation-reduction potential of the electrode pair, and the output of the power supply is controlled so that the current value flowing between the electrodes of the electrode pair becomes a value corresponding to the measurement result of the oxidation-reduction potential measurement unit. A water treatment device including a power control unit. 2. An accommodating portion for accommodating water to be treated, an electrode pair made up of electrodes that are paired in the accommodating portion, a power source for applying a voltage to the electrode pair, and water to be treated in the accommodating portion. A redox potential measuring part for measuring the redox potential of the, a pH measuring part for measuring the pH of the water to be treated in the containing part, and a current value flowing between the electrodes of the electrode pair is a measurement result of the pH measuring part. And to control the output of the power supply so that the value corresponds to the measurement result of the redox potential measurement unit,
A water treatment device including a power supply control unit. 3. The oxidation-reduction potential measuring unit measures the oxidation-reduction potential at a portion of the treated water that flows into the accommodation unit and at a portion of the treated water that flows out of the accommodation unit in the accommodation unit. The water treatment device according to claim 1 or 2. 4. The power supply control unit uses the difference between the redox potential of the inflow portion and the redox potential of the outflow portion as the measurement result of the redox potential measurement unit.
The water treatment device described in 1. 5. The oxidation-reduction potential measurement unit includes a measurement member for measuring the oxidation-reduction potential of the outflow portion, and is installed between the measurement member and the electrode to aerate the water to be treated. The water treatment device according to claim 3 or 4, further comprising an aeration member. 6. A water treatment method of treating an untreated water by immersing the electrode pair in the untreated water and applying a voltage to the electrode pair, the method comprising measuring an oxidation-reduction potential of the untreated water. And a step of controlling the output of the power source so that the current value flowing between the electrodes of the electrode pair becomes a value corresponding to the measurement result of the oxidation-reduction potential of the water to be treated. 7. A water treatment method for treating an untreated water by immersing the electrode pair in the untreated water and applying a voltage to the electrode pair, the step of measuring an oxidation-reduction potential of the untreated water. A step of measuring the pH of the water to be treated, and a current value flowing between the electrodes of the electrode pair so that the current value of the power source is adjusted to a value corresponding to the measurement results of the pH and the redox potential of the water to be treated. Controlling the output of the water.