JP2003311274A - Water treatment apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water treatment apparatus which is capable of stably keeping a high throughput. <P>SOLUTION: A treated water tank 1 is partitioned to an anode chamber 3A and a cathode chamber 4A by a diaphragm 2. The diaphragm 2 is composed of a cation exchange membrane. An electrode 4 consists of an alloy which consists essentially of copper and contains a metal having higher ionization tendency than copper, such as Devarda's alloy. In the treated water tank 1, an alkaline salt is supplied from an alkaline salt supplying device 6 and, when the electrolysis of water to be treated is performed by the electrode 3 (anode) and the electrode 4 (cathode), the cathode chamber 4A becomes alkaline. Then, nitrate nitrogens in the water to be treated is reduced to ammonium ions by the electrode 4 in the alkaline solution. <P>COPYRIGHT: (C)2004,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 more particularly to a water treatment device for removing unnecessary components in water to be treated.

[0002]

2. Description of the Related Art In conventional water treatment apparatuses, removal of nitrogen oxides from water containing nitrogen oxides contained in water to be treated such as groundwater, domestic wastewater, and factory wastewater has been carried out by biological treatment. Biological treatment is the decomposition of nitrogen oxides into nitrogen gas by the activity of denitrifying bacteria under anaerobic conditions. Further, in the conventional water treatment device, when removing the phosphorus component from the water to be treated, a chemical agent for supplying metal ions into the water to be treated has been introduced. Moreover, in the conventional water treatment equipment, SS (Suspended Solids) is generated from treated water.
A flocculant was added to remove the coagulant.

[0003]

However, in the activity of denitrifying bacteria, BOD (biochemical
xygen demand) source is required, so that it is necessary to add methanol or the like to the treatment device of the water to be treated, and there is a problem that maintenance of the treatment device becomes complicated.
In addition, since biological treatment has a long reaction time, it is difficult to handle high-concentration nitrogen oxides such as industrial wastewater, and further, when the temperature decreases in winter, the activity of denitrifying bacteria decreases,
Stable processing was difficult. In addition, phosphorus component and S
When a drug is added in the removal of the S component, maintenance such as management of the amount of the drug to be added, stirring conditions, selection of optimum pH, etc. has been complicated.

The present invention has been conceived in view of the above circumstances, and an object thereof is to provide a water treatment device capable of easily and stably supplying a high treatment capacity.

[0005]

A water treatment apparatus according to an aspect of the present invention includes a container for containing water to be treated, and a first electrode pair provided in the container, The cathode of the first electrode pair is a first member made of an alloy containing an amphoteric metal.

According to the present invention, when the first electrode pair is energized, the amphoteric metal (for example, aluminum or zinc) is eluted at the cathode and reacts with the anion in the aqueous solution to form a coagulant. To be done. Since the amphoteric metal is eluted at the cathode, it is possible to avoid the passivation of the metal on the electrode.

As a result, in treating the SS component in the water to be treated, it is possible to provide a water treatment apparatus which can easily and stably supply a high treatment capacity as compared with a water treatment apparatus using biological treatment or the like.

A water treatment apparatus according to another aspect of the present invention is
A containing portion for containing the water to be treated, and a first electrode pair provided in the containing portion, the cathode of the first electrode pair, the components in the cathode is eluted, in the containing portion, The first member is made of an alloy containing a metal that forms a water-insoluble compound that acts as a coagulant.

According to the present invention, when the first pair of electrodes is energized, a coagulant is produced at the cathode.

Thus, in treating the SS component in the water to be treated, it is possible to provide a water treatment apparatus which can easily and stably supply a high treatment capacity as compared with a water treatment apparatus using biological treatment or the like.

Further, in the water treatment apparatus of the present invention, the first
Member is an alloy containing copper as a main component, and the anode of the first electrode pair oxidizes ammonium ions generated by reduction of nitrogen oxides in the water to be treated by the first member. Is preferred.

As a result, nitrogen oxides in the water to be treated are
It can be converted to nitrogen gas without using biological treatment, that is, with high treatment capacity and stability. Also, since the equipment can be made more compact than biological treatment, avoiding problems such as lack of installation space and huge remodeling cost when adding nitrogen oxide removal function to existing wastewater treatment equipment. it can. Note that, because electrons are emitted onto the cathode due to the oxidation of a part of the components of the first member in the cathode,
The reduction of nitrogen oxides at the cathode is promoted.

Further, in the water treatment apparatus of the present invention, the first
It is preferable that the member (1) is made of an alloy containing a metal having a higher ionization tendency than copper.

As a result, nitrogen oxides in the water to be treated are efficiently converted into nitrogen gas. Further, in the water treatment device of the present invention, a diaphragm that partitions the inside of the housing into a first tank and a second tank, and a first tank anode that is immersed in the water to be treated in the first tank to form an anode Further comprising a second tank cathode which is immersed in the water to be treated in the second tank and constitutes a cathode, and a first power supply which supplies electric power to the first tank anode and the second tank cathode. preferable.

As a result, the reaction on the anode and the reaction on the cathode are divided into the first tank and the second tank, and each is efficiently carried out. That is, the reduction of nitrogen oxides on the cathode is efficiently performed.

Further, the water treatment apparatus of the present invention is a third tank which is a tank into which the water to be treated in the second tank is introduced and which is different from the first tank and the second tank. And an oxidant addition section for adding an oxidant to the third tank.

As a result, ammonium ions generated on the basis of the reduction of nitrogen oxides in the second tank are converted into the third ions.
Can be efficiently oxidized to nitrogen gas.

Further, the water treatment apparatus of the present invention preferably further comprises an alkaline reagent charging member for charging an alkaline reagent for supplying ions of an alkaline metal or an alkaline earth metal in an aqueous solution into the accommodating portion.

As a result, the water to be treated in the container can be easily made alkaline. This allows the cathode
The elution of metals such as amphoteric metals can be promoted.

Further, the water treatment apparatus of the present invention controls the amount of the reagent fed by the alkaline reagent feeding member based on the pH detection unit for detecting the pH in the storage unit and the detection output of the pH detection unit. It is preferable to further include a charging amount control unit.

Thus, by referring to the detection output of the pH detecting section, the water to be treated in the accommodating portion can be surely made to be a strong alkali, so that the treatment of nitrogen oxides in the water to be treated can be surely carried out. .

Further, the water treatment apparatus of the present invention is provided between the nitrate ion electrode for detecting the nitrate ion concentration of the water to be treated in the accommodating section, and the first member and the nitrate ion electrode. It is preferable to further include a shielding means.

As a result, it has been difficult to recognize that the electrode has reached the end of its useful life and is no longer useful unless the treated water is collected and analyzed by an ion chromatograph. It can be recognized by detecting the nitrate ion concentration in the treated water. That is,
By easily and accurately recognizing that the electrode or the first member has reached the end of its life in the reduction of nitrogen oxides, it is possible to more reliably remove nitrogen oxides from the water to be treated. In addition, since the shielding member is provided between the nitrate ion electrode and the first member, the detection by the nitrate ion electrode can be performed electrically from the first electrode when the first member is used as an electrode. You can avoid being affected.

Further, it is preferable that the apparatus further comprises an inflow section which is a water tank into which the water to be treated in the accommodating section is introduced and subjected to oxidation treatment.

As a result, ammonium ions generated by reducing the nitrogen oxides in the water to be treated can be easily and reliably oxidized to nitrogen gas.

In the water treatment apparatus of the present invention, the anode of the first electrode pair is made of stainless steel, a material containing a noble metal element,
Alternatively, an electrode made of a material coated with a material containing a noble metal element or a carbon electrode is preferable.

Further, in the water treatment apparatus of the present invention, it is preferable that the first electrode pair is supplied with a constant current.

A water treatment apparatus according to still another aspect of the present invention is a storage unit for storing water to be treated, an alkaline water generating unit for making a solution in the storage unit strongly alkaline, and the storage unit. And a first member which is made of an alloy containing copper as a main component and containing a metal having a higher ionization tendency than copper, and which reduces a nitrogen oxide in the water to be treated in the accommodating portion.

According to the present invention, the nitrogen oxide in the water to be treated is reduced to nitrogen gas by the first member in the strong alkaline solution.

As a result, nitrogen oxides in the water to be treated are
Without using biological treatment, that is, with high throughput,
It can be stably converted to nitrogen gas. In addition, since the device can be made more compact than biological treatment, it is possible to avoid problems such as lack of installation space and enormous modification cost even when adding a nitrogen removal function to an existing wastewater treatment device. .

Further, in the water treatment device of the present invention, the first
It is preferable that the member in the form of a powder, a bulk, a mesh, a rod or a plate is installed in the accommodating portion.

This increases the surface area per volume of the first member, so that the nitrogen oxides in the water to be treated are more reliably reduced.

The water treatment apparatus of the present invention preferably further includes a stirring member for stirring the inside of the accommodating portion.

Further, in the water treatment apparatus of the present invention, it is preferable that the accommodating portion is of a hopper type, and a drain valve is provided at the bottom thereof.

As a result, since the water-insoluble compound generated in the accommodating portion can be quickly removed from the vicinity of the electrode, it is possible to prevent the compound from interfering with electrolysis at the electrode.

Further, the water treatment apparatus of the present invention preferably further comprises a separating means for separating the solid and the liquid in the containing portion.

As a result, since the water-insoluble compound generated in the accommodating portion can be easily removed from the vicinity of the electrode, it is possible to avoid the compound from interfering with electrolysis at the electrode.

Further, the water treatment apparatus of the present invention preferably further comprises a storage tank having a capacity equal to or larger than the capacity of the accommodating portion and accommodating the water to be treated fed into the accommodating portion.

As a result, the water to be treated can be stably fed into the container. Further, it is preferable that the water treatment device of the present invention further includes a water supply unit that sends a part of the water to be treated in the storage unit to the storage tank.

As a result, when a coagulant is generated in the accommodating portion, the coagulant is allowed to act on the water to be treated before being sent to the accommodating portion, so that the SS component in the water to be treated sent to the accommodating portion is changed in proportion. Can be reduced. Therefore, it is possible to effectively cause the metal ions generated by the electrolytic reaction to act on the water to be treated in the accommodating portion.

Further, in the water treatment apparatus of the present invention, the inflow valve through which the water to be treated flowing into the accommodation section passes, the discharge valve through which the water to be treated discharged from the accommodation section passes, the inflow valve and the It is preferable to further include a valve control unit that controls opening and closing of the discharge valve.

Further, the water treatment apparatus of the present invention preferably further comprises a calcium compound charging section for charging a compound containing calcium, upstream of the first member of the housing section.

As a result, the fluorine component in the water to be treated is
It can be aggregated and settled without resorting to biological treatment.

In the water treatment apparatus of the present invention, it is preferable that the water to be treated after biological treatment is introduced into the accommodating portion.

This makes it possible to avoid introducing substances, such as chloride ions, which are generated in the water treatment apparatus and which are not preferable for the inhabitation of microorganisms, into the biological treatment tank.

[0046]

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

[First Embodiment] 1. Outline of Nitrogen Removal Device FIG. 1 schematically shows a nitrogen removal device which is a first embodiment of a water treatment device of the present invention. In the nitrogen removal device,
The treated water is introduced into the treated water tank 1 through the inlets 10 and 11, and the electrodes 3 and 4 are immersed in the treated water.
The amount of water to be treated introduced from the inlets 10 and 11 can be controlled by valves 10A and 11A, respectively.

In the treated water tank 1, when the electrodes 3 and 4 are supplied with electric power from the DC power source 5, the electrode 3 serves as an anode and the electrode 4 serves as a cathode, and the water to be treated is electrolyzed.
The electrode 3 is made of, for example, a platinum-iridium alloy, and the electrode 4 is made of an alloy such as a devalda alloy containing copper as a main component and a metal having a higher ionization tendency than copper.
In the treated water tank 1, the region in which the electrode 3 is immersed and the region in which the electrode 4 is immersed are partitioned by the diaphragm 2 into an anode chamber 3A and a cathode chamber 4A. The diaphragm 2 is composed of a cation exchange membrane.

The water to be treated in the anode chamber 3A is introduced into the mixing tank 30 through the outlet 13, and the water to be treated in the cathode chamber 4A is introduced into the mixing tank 30 through the outlet 12 and mixed in the mixing tank 30. It The flow rate of the water to be treated introduced from the outlets 12 and 13 can be controlled by the valves 12A and 13A. The water to be treated in the mixing tank 30 is discharged through the outlet 32.
It is discharged to the outside of the nitrogen removal device. The flow rate of the water to be treated discharged from the discharge port 32 can be controlled by the valve 32A.

An alkaline salt such as sodium hydroxide is supplied to the treated water tank 1 from the alkaline salt supply device 6 through a pipe 6A. Further, the cathode chamber 4A is provided with a stirrer 7 for stirring the water to be treated in the cathode chamber 4A. In the treated water tank 1, instead of the alkali salt,
Alkaline earth metal salts may be provided.

2. In the water to be treated in the chemical reaction treatment tank 1 in the nitrogen removing device, the equilibrium of the following equations (1) and (2) is established by adding sodium chloride.

[0052] ^{_{H 2 O ⇔ H + + OH}} - (1) NaCl ⇔ Na + + Cl - (2) in the anode chamber 3A, as shown in equation (3) to (5), the oxygen gas is the electrolysis of water The generated chlorine ions become chlorine gas, and part of the chlorine gas is hydrated to become hypochlorous acid.

2H ₂ O → O ₂ ↑ + 4H ⁺ + 4e ⁻ (3) 2Cl ⁻ → Cl ₂ ↑ + 2e ⁻ (4) Cl ₂ + H ₂ O → H ⁺ + Cl ⁻ + HClO (5) In the cathode chamber 4 A, the formula ( As shown in 6) and 7), hydrogen gas is generated by electrolysis of water, and sodium ions moving through the diaphragm 2 react with hydroxide ions to generate sodium hydroxide. . In the cathode chamber 4A, the water to be treated becomes alkaline due to the generation of sodium hydroxide.

2H ₂ O + 2e ⁻ → H ₂ ↑ + 2OH ⁻ (6) Na ⁺ + OH ⁻ → NaOH (7) The nitrate ions in the water to be treated introduced into the treated water tank 1 are the electrodes 4 ( Cathode) surface,
It is reduced to ammonia (see formula (9)) via nitrite ions (see formula (8)).

NO ₃ ⁻ + H ₂ O + 2e ⁻ → NO ₂ ⁻ + 2OH ⁻ (8) NO ₂ ⁻ + 5H ₂ O + 6e ⁻ → NH ₃ + 7OH ⁻ (9) Formulas (8) and (9) are represented by the following formula (10). Can be summarized as

NO ₃ ⁻ + 6H ₂ O + 8e ⁻ → NH ₃ + 9OH ⁻ (10) Note that the electrons used for the reduction of nitrate ions in formula (10) are generated when aluminum or zinc of the devalda alloy is eluted in a strongly alkaline manner. It is believed that the reduction reaction occurs on the copper surface in the alloy. The electrode 4 is an alloy made of copper and a metal having a higher ionization tendency than copper,
In the case of other than the Debarda alloy, the electrons used in the formula (10) are generated when the metal contained in the alloy having a higher ionization tendency than copper is eluted.

Further, in the treated water tank 1, sodium ions move to the cathode chamber 4A through the diaphragm 2, so that as the reactions of the above formulas (6) and (7) proceed, the anode chamber is kept in the cathode chamber 4A. The water level is higher than in 3A.

3. Control of Nitrogen Removal Device During Nitrogen Removal of Treated Water According to the above-described chemical reaction, nitrate ions in the treated water introduced into the treated water tank 1 are reduced to ammonia.

According to the above chemical reaction, the anode chamber 3
The water to be treated in A becomes acidic, and the water in the cathode chamber 4A becomes alkaline.

Therefore, in the present embodiment, first, the valve 12
In the state where A and 13A are closed, the inlet 1
Water to be treated is introduced from 0 and 11 and an alkali salt is added and water is electrolyzed. Then, the valves 12A and 13A are opened, and the water to be treated in the anode chamber 3A and the water to be treated in the cathode chamber 4A are mixed in the mixing tank 30.

As described above, in the treated water tank 1 of this embodiment, the treated water in the treated water tank 1 is totally replaced for each treatment.
By removing nitrogen in the water to be treated by a so-called batch method, nitrogen oxides can be surely removed and the water to be treated after treatment can be neutralized. Further, ammonia generated in the cathode chamber 4A becomes ammonium ions in water, and the ammonium ions are oxidized to nitrogen gas in the mixing tank 30 by hypochlorous acid generated in the anode chamber 3A. A discharge hole 31 for discharging the nitrogen gas generated here is formed in the mixing tank 30.

After introducing the treated water into the treated water 1, the valves 12 and 13 are opened and the treated water in the treated water tank 1 is replaced with a predetermined fixed time (1 hour, 2 hours). Etc.).

4. Relationship between pH of treated water and degree of removal of nitrogen oxides As described above, in the present embodiment, the treated water in the cathode chamber 4A is made alkaline to remove nitrogen oxides from the treated water. The process to do proceeds. In order to show this more specifically, FIG. 2 shows an example of the relationship between the pH of the water to be treated and the degree of removal of nitrate nitrogen. In addition,
FIG. 2 shows the duration (horizontal axis of the graph in FIG. 2) when the Devalda alloy is put into the water to be treated in the cathode chamber 4A and sodium hydroxide as an alkali salt is added to the anode chamber 3A of the treated water tank 1. FIG. ₃ is a diagram showing changes in nitrate nitrogen concentration (NO ₃ —N concentration, vertical axis of the graph of FIG. 2) in the water to be treated at each pH. The pH in FIG. 2 is the pH of the water to be treated in the cathode chamber 4A.

According to FIG. 2, the water to be treated in the cathode chamber 4A is made strongly alkaline (pH = 11, 11.5, 12), so that the concentration of nitrate nitrogen decreases with the duration. There is. Since the concentration of nitrate nitrogen hardly decreased at pH 7.3, it is considered that nitrate nitrogen is not removed unless the water to be treated in the cathode chamber 4A is made strongly alkaline. Further, the time for removing nitrate nitrogen becomes shorter as the pH becomes higher.

In the above-described embodiment, one electrode is immersed in each of the anode chamber 3A and the cathode chamber 4A of the treated water tank 1, but a plurality of electrodes may be immersed.
Further, each of the anode chamber 3A and the cathode chamber 4A is one, but a plurality of them may be provided. Further, in the present embodiment described above, the material of the anode 3 may be iron, and in this case, iron ions eluted from the iron electrode can also remove phosphorus in the water to be treated.

When the nitrogen removing apparatus of the present embodiment is used in combination with biological treatment such as an anaerobic tank or an aerobic tank, it is preferable that the treatment with the nitrogen removing apparatus is performed after the biological treatment. This is because in the nitrogen removing apparatus of the present embodiment, compounds such as chloride ions, which are not so preferable for the inhabitation of microorganisms, are generated in the water to be treated.

[Second Embodiment] FIG. 3 schematically shows a nitrogen removing apparatus according to a second embodiment of the present invention.

The nitrogen removing apparatus according to the present embodiment is obtained by adding a pH sensor 21, a stirrer 8 and a control circuit 20 to the nitrogen removing apparatus according to the first embodiment.

The pH sensor 21 is for detecting the pH of the water to be treated in the cathode chamber 4A. pH sensor 21
The detection output of is input to the control circuit 20. Stirrer 8
Is to stir the water to be treated in the anode chamber 3A.

The control circuit 20 can control the amount of alkali salt supplied from the alkaline salt supply device 6 and the amount of electric power supplied from the DC power supply 5. Thereby, the supply amount of the alkali salt is controlled so that the pH of the cathode chamber 4A is always suitable for the removal of nitrogen oxides, and the reaction amount shown in the formula (10) is contained in the water to be treated. The amount of electric power supplied from the DC power supply 5 is controlled so that the amount of nitrogen oxides supplied is sufficient.

[Third Embodiment] FIG. 4 schematically shows a nitrogen removing apparatus according to a third embodiment of the present invention.

In the nitrogen removing device of the present embodiment, the pH sensor 21 of the nitrogen removing device of the second embodiment is replaced with water level sensors 22 and 23.

The water level sensors 22 and 23 are for detecting the water level difference between the cathode chamber 4A and the anode chamber 3A, respectively. The detection outputs of the water level sensors 22 and 23 are the control circuit 2
Input to 0.

The water level difference between the cathode chamber 4A and the anode chamber 3A is Na
It corresponds to the amount of movement of ⁺ . Also, the above equation (6),
As shown in (7), the amount of movement of Na ⁺ corresponds to the amount of OH ⁻ in the cathode chamber 4A. The amount of OH ^{− in} the cathode chamber 4A corresponds to the pH in the cathode chamber 4A. Therefore,
By detecting the water level difference between the cathode chamber 4A and the anode chamber 3A, the same control as in the second embodiment is realized.

When the detection output of the water level sensor 22 is simply used to determine whether or not the water level in the cathode chamber 4A has reached a predetermined water level at which the valves 12A and 13A should be opened. There is also.

[Fourth Embodiment] FIG. 5 schematically shows a nitrogen removing apparatus according to a fourth embodiment of the present invention.

In the nitrogen removing apparatus according to the present embodiment, the electrolytic cell 42 has the inlets 10 and 11 and the outlet 12 as in the treated water tank 1 of the first embodiment, and the outlet 1
2. It is connected to the reaction tank 50 through a cartridge 41 filled with a devalda alloy.

At the inlets 10 and 11 and the outlet 12,
Equipped with valves 10A, 11A and 12A,
The flow rate of the water to be treated introduced into the electrolytic bath 42 and the flow rate of the discharged water can be adjusted. The electrolytic cell 42 has a first
In the same manner as the treated water tank 1 of the embodiment described above, via the pipe 6A,
The alkali salt is supplied from the alkali salt supply device 6.

The electrolytic cell 42 of this embodiment is provided with electrodes 3 and 4 connected to the DC power supply 5. Electrolyzer 4
In 2, the electrodes 3 and 4 are used for electrolysis of water to be treated, the electrode 3 is used as an anode, and the electrode 4 is used as a cathode. The detailed structure of the electrodes 3 and 4 will be described below with reference to FIGS. 6 and 7. The electrodes 3 and 4 are attached to the handle 3 </ b> A, and the cable 3 </ b> B includes wiring for connecting each to the DC power supply 5. The electrode 3 has a rod shape, and the electrode 4 has a cylindrical shape that covers the outer periphery of the electrode 3. Further, although omitted in FIG. 6, the electrode 4 has a mesh shape. The electrode 4 may be cylindrical or porous (the surface is porous).

A partition wall 40 is provided between the electrodes 3 and 4. The partition wall 40 has a cylindrical shape that covers the outer periphery of the electrode 3. The cylindrical shape of the partition wall 40 further has a bottom so as to cover the bottom surface of the electrode 3. And the partition wall 4
0 works similarly to the partition wall 2 in the first embodiment.

In the electrolytic cell 42 of this embodiment, the inlet 1
The tip of 0 extends to the inside of the cylinder of the electrode 4 and the partition wall 40, and the tip of the inlet 11 is located outside the cylinder of the electrode 4. As a result, the water to be treated introduced through the inlet 10 is guided to the inside of the partition wall 40, and only the element that can permeate the diaphragm 40 moves to the outside of the cylinder of the diaphragm 40.

The water to be treated in the electrolytic bath 42 flows into the cartridge 41 when the valve 12A is opened. In the cartridge 41, the reactions of the above formulas (8) and (9) proceed. Then, by further opening the valve 51A, the water to be treated in the cartridge 41 is transferred to the reaction tank 5
Drains to zero.

In the nitrogen removing apparatus of this embodiment, hypochlorous acid is supplied to the reaction tank 50 from the hypochlorous acid supply apparatus 33 through the pipe 33A. As a result, in the reaction tank 50, ammonium ions generated from ammonia, which is a product of the reaction of the formula (9), are oxidized into nitrogen gas, and the alkaline water to be treated introduced into the reaction tank 50 is neutralized. To be done. The water to be treated in the reaction tank 50 is discharged through the outlet 5.
It is discharged to the outside of the nitrogen removing device via 2. Outlet 52
Emissions from the can be controlled by valve 52A.

Also in the nitrogen removing apparatus of the present embodiment,
It is preferable that the water to be treated in the electrolytic bath 42 and the reaction tank 50 is totally replaced at regular time intervals or whenever a predetermined condition is satisfied, so that the treated water is treated in a batch system.

Instead of supplying hypochlorous acid to the reaction tank 50, an electrode pair for electrolysis is provided separately from the electrodes 3 and 4 to generate a compound that oxidizes ammonium ions by electrolysis. Alternatively, ozone may be supplied.

In addition, in the present embodiment, since the cartridge 41 filled with the devalda alloy is provided,
Reduction of nitrogen oxides is performed in the cartridge 41. Therefore, in the present embodiment, the cathode 4 does not need to be composed of a material that itself reduces nitrogen oxides, unlike the Devalda alloy.

[Fifth Embodiment] FIG. 8 schematically shows a nitrogen removing apparatus according to a fifth embodiment of the present invention.

In the nitrogen removing apparatus of this embodiment, the treated water tank 1 is provided with the inlet 10 and the outlet 12, and the electrode 3 (anode) connected to the DC power source 5 for the water to be treated contained therein.
And the electrode 4 (cathode) are soaked and separated by the diaphragm 2 into the anode chamber 3A and the cathode chamber 4A. The electrode 4 is
It is made of an alloy containing at least one kind of metal having copper as a main component and having a greater ionization tendency than copper, such as a Debarda alloy. The anode chamber 3A and the cathode chamber 4A are respectively provided with stirrers 7A and 7A.
B is provided.

The bottom of the treated water tank 1 is provided with a flow path 35 and a pump 36 for flowing water to be treated from the cathode chamber 4A to the anode chamber 3A. By driving the pump 36, the water to be treated is sent from the cathode chamber 4A to the anode chamber 3A in the direction of the arrow 35X in the flow path 35.

In the nitrogen removing apparatus of this embodiment, the reactions of the above formulas (1) to (9) occur. Also, the cathode chamber 4
By sending the treated water of A to the anode chamber 3A, the ammonium ions generated in the cathode chamber 4A are oxidized into nitrogen gas in the anode chamber 3A, and the alkaline treated water in the cathode chamber 4A is Be neutralized.

The residence time of the water to be treated in the cathode chamber 4A is controlled by controlling the operation of the pump 36 by a control circuit (not shown).

[Sixth Embodiment] FIG. 9 schematically shows a nitrogen removing apparatus according to a sixth embodiment of the present invention.

In the nitrogen removing apparatus of this embodiment, in addition to the nitrogen removing apparatus of the fifth embodiment, the anode chamber 3
A chloride supply device 60 for supplying a reagent for supplying chloride ions to A is provided. The supply amount of the reagent is controlled by the pump 62. Further, the nitrogen removing device of the present embodiment is provided with an alkaline salt supply device 61 for supplying an alkaline salt such as sodium chloride to the cathode chamber 4A. The supply amount of the alkali salt from the alkali salt supply device 61 is controlled by the pump 63.

[Seventh Embodiment] FIG. 10 schematically shows a nitrogen removing apparatus according to a seventh embodiment of the present invention.

In the nitrogen removing apparatus of this embodiment, in addition to the nitrogen removing apparatus of the sixth embodiment, the cathode chamber 4
A is provided with a powder 64 of the Debarda alloy. By being stirred by the stirrer 7B, the powder 64 becomes the cathode chamber 4A.
It is evenly present within. Further, in the cathode chamber 4A of the present embodiment, a filter 65 is provided at the boundary portion between the channel 35 and the cathode chamber 4A so that the powder 64 of the Devalda alloy does not flow into the channel 35. In the present embodiment, since the cathode chamber 4A is provided with the powder of the Devalda alloy, the electrode 4 as the cathode is not particularly limited as long as it is a general electrode material. Then, in the present embodiment as described above, the electrons used in the above formula (10) are supplied from the powder 64 of the Devalda alloy, not from the electrode 4.

[Eighth Embodiment] FIG. 11 schematically shows a nitrogen removing apparatus according to an eighth embodiment of the present invention.

In the nitrogen removing apparatus of the present embodiment, in the nitrogen removing apparatus of the seventh embodiment, the cathode chamber 4A is filled with a devalda alloy instead of the devalda alloy powder 64 (see FIG. 10). A cartridge 66 is provided. A minute hole is formed in the cartridge 66 (not shown), and the water to be treated in the cathode chamber 4A enters the cartridge 66 through the hole and comes into contact with the devalda alloy to obtain the formula (10). (Equations (8) and (9)) occur.

The cartridge 66 can be attached to and detached from the treated water tank 1. As a result, even if the devalda alloy placed in alkaline is partially eluted, a new devalda alloy can be placed in the treated water tank 1 by replacing the cartridge 66.

[Ninth Embodiment] FIG. 12 schematically shows a nitrogen removing apparatus according to a ninth embodiment of the present invention.

In the nitrogen removing device of the present embodiment, the cartridge 67 filled with the devalda alloy is attached to the pipe extending from the inlet 10 in the nitrogen removing device of the eighth embodiment.

That is, in this embodiment, as shown in FIG. 12, a tube extends from the inlet 10 into the cathode chamber 4A, and the cartridge 67 is attached to the tip of the tube. A flow path for introducing the water to be treated introduced from the introduction port 10 is formed in the cartridge 67, and the outer peripheral portion of the flow path is filled with granular devalda alloy 68. Further, holes 67A to 67F are formed on the surface of the cartridge 67. As a result, in the nitrogen removing apparatus of the present embodiment, the water to be treated introduced from the inlet 10 comes into contact with the devalda alloy 68 from inside the cartridge 67,
The holes 67A to 67F are discharged into the cathode chamber 4A.

[Tenth Embodiment] FIG. 13 schematically shows a nitrogen removing apparatus according to a tenth embodiment of the present invention.

In the nitrogen removing apparatus of the present embodiment, the cartridge 69 filled with the devalda alloy in the nitrogen removing apparatus of the eighth embodiment is not in the cathode chamber 4A but in the cathode chamber 4A.
It is mounted on the flow path 35 below the treated water tank 1.

That is, in the present embodiment, as shown in FIG. 13, the water to be treated introduced into the cathode chamber 4A has a predetermined reaction in the cathode chamber 4A, and then the pump 36 is operated. Is guided to the flow path 35 by the contact with the devalda alloy in the cartridge 69.

[Eleventh Embodiment] FIG. 14 schematically shows a nitrogen removing apparatus according to an eleventh embodiment of the present invention.

In the nitrogen removing apparatus of this embodiment, in addition to the nitrogen removing apparatus of the sixth embodiment, the anode chamber 3
PH sensors 71 and 72 are provided in A and the cathode chamber 4A, respectively. The electrodes 3 and 4 are connected to the control power supply 70. Also, control power supply 70
Further, pH sensors 71 and 72 and pumps 62 and 63 are supplied to the. Then, the control power source 70 supplies electric power to the electrodes 3 and 4 according to the pH of the water to be treated in the anode chamber 3A and the cathode chamber 4A input from the pH sensors 71 and 72, and the chloride supply device 6.
0 and the supply amount of the substance from the alkaline salt supply device 61 is controlled.

[Twelfth Embodiment] FIG. 15 schematically shows a nitrogen removing apparatus according to the twelfth embodiment of the present invention.

In the nitrogen removing apparatus of the present embodiment, in the nitrogen removing apparatus of the sixth embodiment, the inlet 10 and the outlet 12 are provided in the upper portion of the treated water tank 1, but instead of the treated water tank 1. It is provided at the bottom of.

Further, pumps 10A and 12A are provided between the treated water tank 1 and the inlet 10 and the outlet 12, respectively. By controlling the operations of the pumps 10A and 12A, it is possible to control the amount of the treated water introduced from the inlet 10 into the treated water tank 1 and the amount of the treated water discharged from the outlet 12 to the outside of the treated water tank 1.

As a result, in this embodiment, after the treated water is introduced into the treated water tank 1, the introduction and discharge of the treated water into the treated water tank 1 are stopped, and the treated water using the electrodes 3 and 4 is treated. It is possible to remove nitrogen oxides of the water to be treated by a so-called batch method in which the water to be treated in the treated water tank 1 is replaced after electrolysis of water for a predetermined time.

[Thirteenth Embodiment] FIG. 16 schematically shows a nitrogen removing apparatus according to the thirteenth embodiment of the present invention.

In the nitrogen removing apparatus of the present embodiment, in the nitrogen removing apparatus of the sixth embodiment, the inside of the treated water tank 1 is separated from the inside of the treated water tank 1 by the diaphragm 2 instead of being entirely partitioned by the diaphragm 2. There is a gap with the upper part, the inlet 10 is provided in the lower part of the treated water tank 1, a pipe 74 is provided in the lower part of the treated water tank 1 instead of the outlet 12, and the inlet 10
A pump 73 is provided for adjusting the amount introduced from. The pipe 74 is configured to extend upward from the lower portion of the treated water tank 1 so as to hold the liquid up to a preferable water level T in the anode chamber 3A, and then to face downward.

As a result, in the nitrogen removing apparatus of the present embodiment, first, the water to be treated is introduced into the treated water tank 1 through the inlet 10. Then, when electrolysis is performed and reagents are appropriately supplied from the chloride supply device 60 and the alkali salt supply device 61, sodium ions move from the anode chamber 3A to the cathode chamber 4A via the partition wall 2 and the anode is discharged. The water level in the cathode chamber 4A is higher than that in the chamber 3A. And the cathode chamber 4
When the water level of A exceeds the partition wall 2, the water to be treated in the cathode chamber 4A moves to the anode chamber 3A beyond the partition wall 2. When the water level in the cathode chamber 3A exceeds T, the water to be treated is discharged from the anode chamber 3A through the pipe 74 to the outside of the treated water tank 1.

[Fourteenth Embodiment] FIG. 17 schematically shows a nitrogen removing apparatus according to a fourteenth embodiment of the present invention.

In the nitrogen removing apparatus of the present embodiment, first, in the nitrogen removing apparatus of the sixth embodiment, the treated water tank 1
Instead of the diaphragm 2, two diaphragms 2A and 2B are provided therein, and the treated water tank 1 is partitioned into three parts, an anode chamber 3A, a cathode chamber 4A, and a recovery chamber 2X. The diaphragm 2A is a cation exchange membrane, and the diaphragm 2B is an anion exchange membrane. Then, the chloride supply device 60 supplies chloride ions to the anode chamber 3A, and the alkali salt supply device 61 supplies alkali salt to the cathode chamber 4A.

Further, the flow path 35 is formed by the cathode chamber 4A and the anode chamber 3
The lower part of A is connected, but the introduction port 7 is provided in the lower part of the recovery chamber 2X.
7 is provided. Water is introduced into the recovery chamber 2X from the introduction port 77 in the direction of the arrow 77X, and the introduction amount is controlled by the pump 77A.

In the nitrogen removing apparatus of this embodiment, sodium ions move from the anode chamber 3A to the recovery chamber 2X through the diaphragm 2A which is a cation exchange resin, and chloride ions leave the cathode chamber 4A as anions. It moves to the recovery chamber 2X via the diaphragm 2B which is an exchange resin. That is, it is considered that the concentrations of chloride ions and sodium ions in the recovery chamber 2X are higher than those in the anode chamber 3A and the cathode chamber 4A. Then, the solution in the recovery chamber 2X is pumped up by the pump 75 and sent to the alkaline salt supply device 61 via the pipe 76. Thus, the sodium chloride in the recovery chamber 2X can be reused as the alkaline salt supplied to the cathode chamber 4A. Further, in the recovery chamber 2X, water is supplied to the pump 77A to adjust the concentration of chloride ions and sodium ions in the solution in the recovery chamber 2X and to adjust the liquid level of the solution.
Supplied by

[Fifteenth Embodiment] FIG. 18 schematically shows a nitrogen removing apparatus according to a fifteenth embodiment of the present invention.
In the above-described first to fourteenth embodiments, in the nitrogen removing apparatus, the treated water is an alkaline solution by adding an alkaline salt such as sodium chloride to the treated water and electrolyzing the treated water. In the above embodiment, an alkaline salt is added to the water to be treated to make the water to be treated an alkaline solution.

In the nitrogen removing apparatus, the water to be treated is introduced into the treated water tank 80 through the inlet 80A and the outlet 8
Treated water is discharged from 0B. The treated water tank 80 has a wall 81.
Thus, it is partitioned into a first reaction tank 80X and a second reaction tank 80Y. First reaction tank 80X and second reaction tank 80Y
Are provided with agitators 84 and 85 for agitating the water to be treated therein. The agitators 84 and 85 are
The motors 84A and 85A rotate as they operate. A cover 83 is provided near the wall 81, whereby the water to be treated in the first reaction tank 80X moves to the second reaction tank 80Y according to the arrow Q.

An alkaline reagent such as sodium hydroxide is supplied from the alkaline reagent supply device 91 to the first reaction tank 80X. The supply amount of the reagent is determined by the first reaction tank 8 detected by the pH sensor 93 by the control circuit 90.
By controlling the pump 91A according to the pH of the water to be treated in 0X, the water to be treated in the first reaction tank 80X is adjusted to be strongly alkaline.

Further, the first reaction tank 80X is provided with a cartridge 82 filled with a devalda alloy. As a result, in the first reaction tank 80X, the formula (10) (formula (8) and formula (9)) occurs in the strongly alkaline solution,
Nitrogen oxides are converted to ammonium ions.

An oxidizing agent such as hypochlorous acid is supplied from the acidic reagent supply device 92 to the water to be treated in the second reaction tank 80Y. Note that the supply amount of the oxide is adjusted by controlling the pump 92A.

By introducing the water to be treated in the first reaction tank 80X into the second reaction tank 80Y, the water to be treated is neutralized and the reaction of the formula (10) in the first reaction tank 80X is performed. The generated ammonium ions are oxidized to nitrogen gas.

[Sixteenth Embodiment] FIG. 19 schematically shows a nitrogen removing apparatus according to the sixteenth embodiment of the present invention.

In the nitrogen removing apparatus of this embodiment, the 15th
In the nitrogen removing device according to the embodiment of the present invention, instead of the acidic reagent supply device 92, the electrode pair (electrodes 95, 96) immersed in the water to be treated in the second reaction tank 80Y and the electrodes 95, 96
Is made of, for example, a platinum-iridium alloy, and is supplied with power from a power supply 94.

As a result, in the nitrogen removing apparatus of the present embodiment, the electrolysis of the water to be treated is carried out at the electrode pair (electrodes 95 and 96), whereby chlorine dissolved in the water to be treated is oxidized, and Chlorous acid is generated. By this hypochlorous acid, the water to be treated introduced from the first reaction tank 80X is neutralized, and the ammonium ion in the water to be treated is oxidized.

[17th Embodiment] The first embodiment described above
In the thirteenth embodiment, most of the nitrogen oxides are reduced to ammonia in the cathode 4 of the nitrogen removing device as shown in the formula (10), and are converted into ammonium ions and then oxidized. Although it becomes nitrogen gas, it may be directly reduced to nitrogen gas at the cathode 4 as shown in the formula (11).

2NO ₃ ⁻ + 6H ₂ O + 6e ⁻ → N ₂ ↑ + 12OH ⁻ (11) When a reaction such as the formula (11) occurs, the nitrogen removing device reduces nitrogen oxides in the water to be treated in the containing portion. If the member is included, the nitrogen oxide in the water to be treated is reduced to nitrogen gas by itself.

[Eighteenth Embodiment] The first embodiment described above
In the thirteenth embodiment, the region where the anode 3 and the cathode 4 are installed in the treated water tank 1 is partitioned by the diaphragm 2 to form the anode chamber 3A and the cathode chamber 4A. However, in the present invention, it is not always necessary to form the anode chamber and the cathode chamber with the diaphragm. As shown in FIGS. 20 and 21, in the treated water tank 1, the anode 3 and the cathode 4 may be installed without being partitioned by a diaphragm.

20 and 21 are respectively FIG. 8 and FIG.
It is a figure which shows the nitrogen removal apparatus which deleted the diaphragm 2, the flow path 35, and the pump 36 from the nitrogen removal apparatus shown in FIG. In the nitrogen removal device shown in FIGS. 20 and 21, a slight decrease in the removal rate of nitrogen oxides is expected as compared with the nitrogen removal device shown in FIGS. 8 and 11 in which the anode chamber and the cathode chamber are formed. On the other hand, on the other hand, since it is not necessary to replace the diaphragm according to the deterioration of the function due to the change with time, the maintenance can be significantly facilitated and the running cost can be remarkably reduced.

[Nineteenth Embodiment] FIG. 22 schematically shows a water treatment apparatus which is a nineteenth embodiment of the water treatment apparatus of the present invention.

In the water treatment device, the treated water is introduced into the treated water tank 202 through the inlet 210, the electrodes 203 and 204 are immersed in the treated water, and the outlet 2
The treated water is discharged from 11. The amount of treated water introduced from the inlet 210 and the amount of treated water discharged from the outlet 211 can be controlled by controlling the opening and closing of the valves 210A and 211A, respectively. Further, the treated water tank 202 is formed with an exhaust port 212 for discharging the gas generated inside, and the opening / closing of the exhaust port 212 is controlled by opening / closing a valve 212A.

In the treated water tank 202, the electrodes 203, 20
4 is supplied with power from the DC power supply 205,
The electrode 203 serves as an anode and the electrode 204 serves as a cathode, and the water to be treated is electrolyzed. The electrode 203 is made of, for example, a platinum-iridium alloy. Other examples of the electrode 203 include a precious metal or a material coated with a precious metal, a material containing a precious metal, a material coated with a material containing a precious metal, a carbon electrode, or an electrode made of stainless steel. Here, examples of the material containing a noble metal include an oxide of platinum, iridium oxide, and a material obtained by mixing a noble metal in ceramics and firing (silicon oxide, titanium oxide, etc.). The electrode 204 includes an alloy containing an amphoteric metal, such as a copper-aluminum alloy, or a metal that is oxidized to form a water-insoluble compound that acts as an aggregating agent by reacting with anions such as hydroxide ions. It can be an alloy or an alloy containing a metal that forms a compound insoluble in water by being oxidized and reacting with phosphate ions.

Further, the water treatment apparatus is provided with a water level sensor 222 and a pH sensor 223 in the treated water tank 202. Further, the water treatment device is provided with a chemical supply device 206 that supplies sodium chloride and hypochlorous acid into the treated water tank 202. From the drug supply device 206, a drug is appropriately administered into the treated water tank 202 via the pipe 206A. A stirrer 207 is provided in the treated water tank 202, and the stirrer 207 is rotated by appropriate power from outside the treated water tank 202 to stir the water to be treated in the treated water tank 202. When the treated water is being treated in the treated water tank 202, the agitator 207 is used.
Are rotated accordingly.

The water treatment device includes a water level sensor 22.
2 and the detection output of the pH sensor 223 is introduced, the valve 2
10A, 211A, 212A and DC power supply 205
A control circuit 220 is provided for controlling the operation of.

FIG. 23 schematically shows main electrolytic reactions on the electrodes 203 and 204. Then, further referring to FIG. 23, an electrolytic reaction in the treated water tank 202 and a reaction accompanying it will be described.

In the water to be treated in the treated water tank 202, the equilibrium of the above equations (1) and (2) is established by adding sodium chloride. In addition, the electrode 20
In the vicinity of 3, as shown in the above formulas (3) to (5), oxygen gas is generated by electrolysis of water, chlorine ions become chlorine gas, and a part of chlorine gas is hydrated to form hypochlorous acid. Become an acid. In the vicinity of the electrode 204, the above formula (6),
As shown in (7), hydrogen gas is generated by electrolysis of water, and sodium ions react with hydroxide ions to generate sodium hydroxide. Thereby, the electrode 204
In the vicinity, the water to be treated becomes alkaline.

Then, the nitrate ion in the water to be treated introduced into the treated water tank 202 is reduced to ammonia on the surface of the electrode 204 via the nitrite ion (see formulas (8) to (10)). It is considered that the electrons used for the reduction of nitrate ions in the formula (10) are also generated when aluminum (or zinc) in the electrode 204 is eluted with strong alkalinity.

The ammonia produced as described above is combined with the hypochlorous acid produced as described above to form the following formula (1)
Chloramines are produced as in 2) to (14). Further, the generated chloramines are converted into nitrogen gas or dinitrogen monoxide as shown in formulas (15) and (16).

[0140]

[Equation 1]

The aluminum eluted from the electrode 204 as described above reacts with hydroxide ions in the water to be treated as aluminum ions to form aluminum hydroxide, as shown in the following formula (17). As shown in formula (18), it reacts with sodium ions as aluminate to become sodium aluminate. The produced compounds neutralize the electric charge of the colloid in water (the SS component in the water has a particle size of about 1 to 0.01 × 10 ⁻⁶ m), and the attractive force between the particles works. Eventually it becomes floc and sinks.

[0142]

[Equation 2]

Further, the aluminum ion eluted from the electrode 204 reacts with the phosphate ion in the water to be treated to become aluminum phosphate insoluble in water and precipitates, as shown in the following formula (19). As a result, the phosphoric acid component in the water to be treated can be removed by the aluminum ions. Note that in this embodiment, since a metal capable of removing a phosphoric acid component and an SS component, which is typified by aluminum, is eluted at the cathode, such a metal is generated near the electrode as compared with the case where it is eluted at the anode. Passivation can be avoided.

[0144]

[Equation 3]

As described above, in the present embodiment,
Since the electrode 204 is made of an alloy containing copper as a main component and a metal having a higher ionization tendency than copper, such as a Devarda alloy, it is possible to remove nitrogen oxides in the water to be treated. If the purpose is only to remove nitrogen oxides and / or phosphoric acid in the water to be treated, the electrode 204 is treated with an amphoteric metal such as aluminum, the components in the electrode 204 are eluted, and treated. A compound that reacts with anions in the water tank 202 to act as a flocculant and forms a compound insoluble in water, or a compound that is oxidized and reacts with a phosphate ion to form a compound insoluble in water. It may be composed of a single metal.

As described above, in the present embodiment,
An electric current is passed between the electrodes 203 and 204, and
By making the water to be treated alkaline,
The process of removing nitrogen oxides proceeds. More about this
To show concretely, a current is applied between the electrodes 203 and 204.
And the degree of removal of nitrate nitrogen in the water to be treated
FIG. 24 shows an example of the relationship with the cousin. Note that the group shown in FIG.
The horizontal axis of the rough is when current is applied between the electrodes 203 and 204.
And the vertical axis represents the nitrate nitrogen concentration (NO in the water to be treated).
₃-N concentration). In addition, the graph of FIG.
The certain electrode 203 is an electrode containing Pt-Ir as a constituent material.
Is used for the electrode 204, which is a cathode, and brass and high strength yellow.
Copper or devalda alloy is used, and the cathode current density is 2
A / dm ²This is the result when electrolysis is performed at a current value of

As can be seen from FIG. 24, the longer the electrolysis time, the lower the concentration of nitrate nitrogen in the water to be treated. Also, it can be seen that the rate of decrease in nitrate nitrogen concentration increases in the order of Debarda alloy, high strength brass, and brass. Debarda alloy, high-strength brass, and brass are alloys containing Cu as a main component and amphoteric metals such as Zn and Al.
It is considered that its composition is related to the rate of decrease of nitrate nitrogen concentration. Specifically, rather than Cu-Zn-based brass,
The Cu-Zn-Al devalda alloy, high strength brass,
The nitrate nitrogen concentration decreases rapidly. Further Cu-Zn-Al
Even in the system, the devalda alloy having a high Al ratio has a faster decrease in the nitrate nitrogen concentration than the high strength brass.

[Twentieth Embodiment] FIG. 25 schematically shows a water treatment apparatus which is a twentieth embodiment of the present invention. The water treatment device of the present embodiment is obtained by further connecting a reaction tank 250 to the water treatment device shown in the nineteenth embodiment.

In the water treatment apparatus of this embodiment, the treated water tank 202 is connected to the reaction tank 250 through the outlet 211. That is, the reaction tank 250 includes the inlet 251 into which the water to be treated is introduced, and the inlet 251 is the outlet 211.
The water to be treated is introduced from the treated water tank 202 by being connected via the valve 211A.

The reaction tank 250 is provided with an exhaust port 252 for appropriately discharging the gas generated in the tank to the outside of the tank and a valve 252A for opening and closing the exhaust port 252. Further, the reaction tank 250 is provided with a hypochlorous acid supply device 533 for supplying hypochlorous acid into the reaction tank. The hypochlorous acid supply device 533 supplies hypochlorous acid into the reaction tank 250 via the pipe 533A. Further, the reaction tank 250 is provided with a discharge port 553 for discharging the water to be treated and a valve 553A for opening and closing the discharge port 553.

Hypochlorous acid supply device 533 and valve 2
The operations of 52A and 553A are controlled by the control circuit 220. Further, the reaction tank 250 is provided with a stirrer 557 that rotates by being appropriately powered from the outside. When the water to be treated is being processed in the reaction tank 250, the water to be treated in the reaction tank 250 is stirred by the stirrer 557.

In the water treatment apparatus of this embodiment, the water to be treated which has been treated in the treated water tank 202 as described in the nineteenth embodiment is further mixed with hypochlorous acid in the reaction tank 250. ,It is processed. This ensures the conversion of ammonia to chloramines described in the above formulas (12) to (14). Therefore, in the water treatment device of the present embodiment, the conversion of nitrogen oxides to nitrogen gas is performed more reliably. In the present embodiment, in the reaction tank 250, hypochlorous acid used for conversion of ammonia into chloramines was directly supplied by the hypochlorous acid supply device 533.
Instead of supplying hypochlorous acid to the reaction tank 250, an electrode pair for electrolysis may be provided separately from the electrodes 203 and 204 to generate a compound that oxidizes ammonia (ammonium ion) by electrolysis. Alternatively, a device for supplying ozone to oxidize ammonia may be provided.

[Twenty-first Embodiment] FIG. 26 schematically shows a water treatment apparatus according to a twenty-first embodiment of the present invention.

The water treatment apparatus of this embodiment basically has the same structure as the treated water tank 202 of the nineteenth embodiment shown in FIG. 22, but a detailed comparison will show the structure of the bottom. Are different. Specifically, the treated water tank 202 of the present embodiment has a hopper type bottom, and a drain valve 214B is attached to a discharge port 214 newly provided at the bottom. As a result, the treated water tank 2
The sediment and sludge generated in 02 are swiftly and surely
It can be kept away from the electrodes 203, 204. Therefore, it is possible to avoid the reaction on the electrodes 203 and 204 and the reaction of the product generated by the reaction from being hindered by the presence of the above-mentioned precipitate and sludge.

Further, in the treated water tank 202 of this embodiment, a diffuser pipe 260 connected to a pump 261 is connected. In the present embodiment, the diffuser pipe 260 is the treated water tank 2.
By generating bubbles at the bottom of 02, the inside of the treated water tank 202 is agitated.

[Twenty-second Embodiment] FIG. 27 schematically shows a water treatment apparatus according to the twenty-second embodiment of the present invention.

The water treatment apparatus of this embodiment is the same as the treated water tank 202 of the 21st embodiment shown in FIG.
A membrane separation tank 290 connected to the treated water tank 202 is provided. The treated water tank 202 has an inlet 210 and an outlet 211, and the water to be treated discharged from the treated water tank 202 through the outlet 211 is introduced into the membrane separation tank 290.

A plurality of separation membranes 280 connected to the pump 281 are installed in the membrane separation tank 290. Separation membrane 28
As shown in FIG. 28, reference numeral 0 is an assembly of membrane plates assembled in a box shape and having a pipe through which the pump 281 is connected. This membrane is composed of a flat membrane filter, a hollow fiber filter, or the like.

The water to be treated introduced into the membrane separation tank 290 is separated by the operation of the pump 281 to separate the membrane 280.
Through the membrane separation tank 290. As a result, the water to be treated can be reliably separated from the sediment and sludge and discharged.

The bottom of the membrane separation tank 290 is also a hopper type, and a drain valve 291B is attached to the bottom outlet 291. Also, the membrane separation tank 290
An air diffuser 270 connected to the pump 271 is also installed therein.

[23rd Embodiment] FIG. 29 shows a water treatment apparatus according to the 23rd embodiment of the present invention. In the water treatment device of the present embodiment, the separation membrane 280 described in the water treatment device of the twenty-second embodiment has electrodes 203, 204.
It is installed in the same treated water tank 202 as. As a result, it is possible to save space in the water treatment device.

[24th Embodiment] FIG. 30 shows a water treatment apparatus according to a 24th embodiment of the present invention. In the water treatment device according to the present embodiment, the separation membrane 280 described in the water treatment device according to the twenty-second embodiment is not connected to a pump but remains as a plate body in the membrane separation tank 290. Separation membrane 31 that divides the inside of the separation tank 290 into two regions
It is installed in the form of 0. Most of the water to be treated introduced from the treated water tank 202 to the membrane separation tank 290 is the separation membrane 31.
After passing 0, it is discharged to the outside of the membrane separation tank 290.

[Twenty-fifth Embodiment] FIG. 31 shows a water treatment apparatus according to a twenty-fifth embodiment of the present invention. In the water treatment device according to the present embodiment, a nitrate ion electrode 320 is further provided in the membrane separation tank 290 of the water treatment device according to the twenty-fourth embodiment. The nitrate ion electrode 320 is a membrane separation tank 290.
The detection output of the separation membrane 310 and the nitrate ion electrode 320 is
It is input to the control circuit 220.

The control circuit 220 uses the nitrate ion electrode 320.
Each element can be controlled in accordance with the nitrate ion concentration in the water to be treated detected by. For example, when the nitrate ion concentration in the water to be treated is higher than a predetermined concentration, the control circuit 220 performs control such as increasing the value of the current flowing between the electrodes 203 and 204.

[Twenty-sixth Embodiment] FIG. 32 shows a water treatment apparatus according to a twenty-sixth embodiment of the present invention. In the water treatment device of the present embodiment, a calcium compound supply device 262 is installed instead of the chemical supply device 206 of the water treatment device of the nineteenth embodiment. The calcium compound supply device 262 supplies a calcium compound (calcium hydroxide, calcium chloride, etc.) into the treated water tank 202 via the pipe 262A.

By supplying a calcium compound to the water to be treated, the fluorine component present in the water to be treated is aggregated and precipitated as calcium difluoride (CaF ₂ ). The treated water tank 202 of the present embodiment has a discharge port 215 and a discharge port 2 for discharging the coagulated sediment at the bottom thereof.
A valve 215A for opening and closing the valve 15 is provided. The operations of the calcium compound supply device 262 and the valve 215A are controlled by the control circuit 220.

[Twenty-seventh Embodiment] FIG. 33 shows a water treatment apparatus according to a twenty-seventh embodiment of the present invention. In the water treatment device of the present embodiment, the solid-liquid separation tank 300 is further provided in the water treatment device of the twenty-sixth embodiment.

In the solid-liquid separation tank 300, near the bottom,
A separation membrane 310 is provided. The separation membrane 310 completely separates the solid-liquid separation layer 300 into upper and lower parts.

Above the solid-liquid separation tank 300, the treated water tank 2 is provided.
02, the supernatant of the water to be treated in the treated water tank 202 is introduced through a discharge port 213 newly provided. A pump 215A is connected to the discharge port 215. Then, the precipitate generated in the treated water tank 202 is pumped by the pump 21.
By being sent by 5 A, it is sent from the discharge port 215 below the separation membrane 310 in the solid-liquid separation tank 300.

In the solid-liquid separation tank 300, the introduced solid components in the water to be treated are separated by the solid-liquid separation tank 3 through the separation membrane 310.
Move to the bottom of 00. As a result, the solid-liquid separation tank 300
The treated water from which solid components have been removed is treated water tank 20.
It will be returned to 2.

The bottom of the solid-liquid separation tank 300 is of a hopper type, and by controlling the opening and closing of the valve 301A by the control circuit 220 as appropriate, solid components such as precipitates are discharged from the discharge port 301 of the bottom. It

The treated water discharged from the discharge port 211 of the treated water tank 202 of this embodiment has a higher percentage of solid components removed.

[Twenty-eighth Embodiment] FIG. 34 shows a water treatment apparatus according to a twenty-eighth embodiment of the present invention. In the water treatment device of the present embodiment, in the water treatment device of the twenty-fifth embodiment, nitrate ion electrode 320 is replaced by electrodes 203, 20.
4 is installed in the same treated water tank 202 as the No. 4 downstream of the electrodes 203 and 204.

The nitrate ion electrode 320 is installed in the treated water tank 202 with the partition wall 390 separated from the electrodes 203 and 204 so as not to be electrically affected by the electrolysis of the electrodes 203 and 204.

[Twenty-ninth Embodiment] FIG. 35 shows a water treatment apparatus according to a twenty-ninth embodiment of the present invention. In the water treatment device of the present embodiment, the nitrate ion electrode 320 is the electrode 2
So that it is not electrically affected by the electrolysis of 03,204,
It is installed in a nitrate ion electrode tank 330 provided on the downstream side of the treated water tank 202.

[Thirtieth Embodiment] FIG. 36 shows a water treatment apparatus according to a thirtieth embodiment of the present invention. In the water treatment device according to the present embodiment, in addition to the water treatment device according to the twenty-ninth embodiment, a nitrate ion electrode 420 is further provided on the nitrate ion electrode tank 40 provided upstream of the treated water tank 202.
It was installed at 0. As a result, the control circuit 22
At 0, the nitrate ion concentrations of the water to be treated before and after being treated in the treated water tank 202 can be detected.

[31st Embodiment] FIG. 37 shows a water treatment apparatus according to a 31st embodiment of the present invention. The water treatment device of the present embodiment is different from the water treatment device of the thirtieth embodiment in that an operation panel 229 connected to control circuit 220 is further provided. As a result, the control circuit 2
When it is determined by 20 that the electrodes 203 and 204 need to be replaced, it is expected that the electrodes 203 and 204 will be replaced promptly by notifying the fact by display or voice.

The control circuit 220 refers to, for example, the detection outputs of the nitrate ion electrodes 320 and 420 to determine whether the electrodes 2
If it is determined that the nitrogen oxides have not been removed from the water to be treated to the extent expected from the water to be treated in spite of passing a current having a predetermined current value between the electrodes 203, 204, the electrodes 203, 204
Judge that it is necessary to replace.

[32nd Embodiment] FIG. 38 shows a water treatment apparatus according to a 32nd embodiment of the present invention. In the water treatment device of the present embodiment, in the treated water tank 202, the electrode 203 that is the anode is on the upstream side of the electrode 204 that is the cathode,
That is, it is installed near the inlet 210. As a result, a strong water flow hits the electrode 203, so that it is possible to more reliably prevent the scum or the like from coating the electrode 203.

[Thirty-third Embodiment] FIG. 39 shows a water treatment apparatus according to a thirty-third embodiment of the present invention. In the water treatment device of the present embodiment, in the treated water tank 202, the electrode 203 serving as an anode is located below the electrode 204 serving as a cathode.
is set up. Thereby, the gas (oxygen or the like) generated on the electrode 203 can be effectively moved upward. Therefore, since an upward water flow can be created in the treated water tank 202 as indicated by the white arrow, it is possible to more reliably prevent the scum or the like from coating on the electrode 203.

[34th Embodiment] FIG. 40 shows a water treatment apparatus according to the 34th embodiment of the present invention. In FIG. 40, the water treatment device of this embodiment is shown as a primary solid-liquid separation tank 501.
And electrolyzer 502. The primary solid-liquid separation tank is a so-called storage tank, which is a tank having a capacity of 2 to 3 times or more that of the treated water tanks 1, 80, 202 in the above-described embodiments. , 20
It is provided in front of 2. Then, in the water treatment device of the present embodiment, about 1/10 of the treated water is transferred from the treated water tanks 1, 80, 202 including the electrodes 3, 4, 203, 204 to the primary solid-liquid separation tank 501. Will be returned.

As a result, when the coagulant is generated in the treated water tanks 1, 80, 202, the coagulant is removed from the primary solid-liquid separation tank 50.
After acting on the water to be treated in 1, the water to be treated can be introduced into the treated water tanks 1, 80, 202. That is, the water to be treated from which the SS component and the like have been removed by the coagulant to some extent is introduced into the treated water tanks 1, 80 and 202. Therefore, in the treated water tanks 1, 80, 202, the substance produced by electrolysis can be made to act on the water to be treated more effectively, that is, in an environment in which a more unnecessary substance does not exist.

[Thirty-Fifth Embodiment] When the water treatment device of each of the above-mentioned embodiments is used together with biological treatment such as an anaerobic tank or an aerobic tank, it may be arranged after the biological treatment. preferable. Here, a specific example of the nitrogen removal device combined with a water treatment device including biological treatment will be shown. Figure 4
FIG. 1 is a diagram showing a state in which the water treatment device of the present embodiment is applied to the tertiary treatment of the combined septic tank (tank 101).

The water treatment device mainly comprises a tank 101 and a treated water tank 1. The tank 101 is buried in the ground. The inside of the tank 101 is the first partition wall 10
2, the second partition wall 103, the third partition wall 104 and the fourth partition wall 120, the first anaerobic filter bed tank 105, the second anaerobic filter bed tank 110, the contact aeration tank 114, the settling tank 119 and the disinfection tank 121. It is divided into Further, the upper part of the tank 101 is covered with a plurality of manholes 128. Further, members inside the tank 101 are connected to members (third blower 130 etc.) outside the tank 101.
And in FIG. 41, the tank 1 such as the third blower 130 is
For the sake of convenience, the members outside of 01 are shown above the tank 101, but these members are not always shown in the tank 1.
It is not installed above 01.

The first anaerobic filter bed 105 is provided with an inflow port 106 into which domestic waste water, which is water to be treated, flows, and a first anaerobic filter bed 107 is provided inside the inflow port 106. That is, in the present embodiment, the first anaerobic filter bed tank 105 is a contaminant removal tank into which domestic wastewater flows, and is also an inflow tank. In the first anaerobic filter bed 105, the hardly decomposable foreign matter in the domestic wastewater is precipitated and separated, and the organic substances in the domestic wastewater are anaerobically decomposed by the anaerobic microorganisms attached to the first anaerobic filter bed 107. It In addition, nitrate nitrogen is reduced to nitrogen gas.

Further, the first anaerobic filter bed tank 105 is provided with a first advection pipe 108. In addition, the first partition wall 102
A first water supply port 109 is formed in the upper part of the. One end of the first advection pipe 108 is arranged in the first anaerobic filter bed tank 105, and the other end is arranged in the second anaerobic filter bed tank 110. The treated water that has been anaerobically decomposed in the first anaerobic filter bed tank 105 is supplied to the retreating second anaerobic filter bed tank 110 via the first advection pipe 108.

The second anaerobic filter bed 110 is provided with a second anaerobic filter bed 111. By the second anaerobic filter bed 111,
Suspended substances are captured, organic substances are anaerobically decomposed by anaerobic microorganisms, and nitrate nitrogen is reduced to nitrogen gas.

In the second anaerobic filter bed tank 110, the second advection tube 1
12 are provided. A jetting device 132 is attached to the upper part of the second advection pipe 112. Spouting device 1
32 is connected to the third blower 130. Further, the ejection device 132 connects the second anaerobic filter bed tank 110 and the contact aeration tank 114 via the second water supply port 13 penetrating the upper part of the second partition wall 103.

The jetting device 132 blows air from the jet outlet 131 into the second advection pipe 112 by sending air from the third blower 130. As a result, the second advection tube 1
In 12, the supply of treated water from the second anaerobic filter bed tank 110 to the contact aeration tank 114 is promoted.

The contact aeration tank 114 is provided with a contact material 115. The contact material 115 is provided to promote cultivation of aerobic microorganisms. A first air diffuser 116 is provided near the bottom of the contact aeration tank 114.

The upper end of the first air diffuser 116 is connected to the first blower 117. A plurality of holes are formed on the lower surface side of the first air diffusing tube 116. Then, when air is sent from the first blower 117, the air is discharged as bubbles from the holes. In addition, since the holes are formed on the lower surface side of the first air diffusing tube 116, the sludge is less likely to enter the inside than when the holes are formed on the upper surface or the side surface.

By discharging bubbles from the first air diffusing tube 116, the contact aeration tank 114 is maintained in an aerobic state. As a result, in the contact aeration tank 114, the treated water is aerobically decomposed by aerobic microorganisms and nitrified,
Ammoniacal nitrogen is decomposed into nitrate nitrogen. The aerobic microorganisms in the contact aeration tank 114 include nitrifying bacteria. Generally, nitrifying bacteria refer to ammonia-oxidizing bacteria and nitrite-producing bacteria.

On the contact material 115, a biofilm that has grown and gradually increased is attached. When the air bubbles are released from the first air diffusing tube 116, the biofilm attached to the contact material 115 is peeled off.

At the bottom of the contact aeration tank 114, the pump 1
33 is provided. A sludge return passage 134 is connected above the pump 133, and the sludge return passage 1 is provided at the upper end of the sludge return passage 134 so as to extend to the left side in FIG. 41.
35 is connected. As a result, the contact aeration tank 11
The sludge generated in 4 is sent to the first anaerobic filter bed tank 105.
The lower end of the third partition wall 104 is not connected to the inner wall surface of the tank 101, but the contact aeration tank 114 and the precipitation tank 119 are connected at the bottom.

A disinfection tank 121 is provided above the settling tank 119. The disinfection tank 121 is configured so that the supernatant of the settling tank 119 flows into it. Also, the disinfection tank 1
21 is equipped with a sterilizer 22. Sterilizer 2
2 is equipped with a chemical such as chlorine. Disinfection tank 12
The treated water that has flowed into the No. 1 is sterilized by the chemical, and the drain port 12
It is sent to the treated water tank 1 via 3. When the treated water is sent to the treated water tank 1, the nitrogen oxides in the treated water are converted into nitrogen gas as described in the first embodiment and the like.

The settling tank 119 has a third advection tube 13
8 and a pump 139. The treated water in the contact aeration tank 114 flows into the settling tank 119 via the third advection pipe 138. In addition, this flow is based on the pump 139.
Is promoted by

The settling tank 119 and the first anaerobic filter bed tank 105 are
It is connected by the first return pipe 124. The first return pipe 124 has a second air diffusing pipe 125 inside. The second air diffuser 125 is connected to the second blower 126. The second diffuser pipe 125 is appropriately formed with an ejection hole for ejecting air, and the air supplied from the second blower 126 is ejected from the ejection hole so that the treated water in the settling tank 119 is first The first anaerobic filter bed tank 10 via the return pipe 124.
Send to 5.

An electrolytic cell 159 is provided above the first anaerobic filter bed tank 105. Water to be treated is introduced into the electrolytic bath 159 from the first return pipe 124. Electrode pairs 151 and 152 are provided inside the electrolytic cell 159. The electrode pairs 151 and 152 are connected to a power source 157, respectively. In the electrolytic cell 159, metal ions such as iron ions and aluminum ions are eluted by the electrolysis reaction in the electrode pairs 151 and 152. As a result, the electrolytic cell 15
In 9, the eluted metal ions react with the phosphorus compound and the like in the treated water to form a metal salt that is sparingly soluble in water and aggregate. As the refractory metal salt produced when iron ions are eluted as metal ions, “FePO ₄ ”,
"Fe (OH) ₃ ", "FeOOH", "Fe
₂ O ₃ ”, and a compound of“ Fe ₃ O ₄ ”can be mentioned. That is, when iron ions are supplied to the water to be treated, the above-mentioned five kinds of compounds are mainly aggregated.

A magnetic processing unit 160 is installed on the downstream side of the electrolytic cell 159. The water to be treated in the electrolytic bath 159 flows into the magnetic treatment unit 160. In the magnetic treatment unit 160, the water to be treated comes into contact with the magnet. Note that Fe ₂ O ₃ and Fe ₃ O ₄ are attracted to the magnet. That is, the agglomerates generated by supplying iron ions to the water to be treated contain Fe ₂ O ₃ and Fe ₃ O _4, and are attracted to the magnet. As a result, FePO ₄ aggregated with Fe ₂ O ₃ and Fe ₃ O ₄ is also attracted to the magnet and separated from the water to be treated. After being treated by the magnetic treatment unit 160, the water to be treated is sent to the first anaerobic filter bed tank 105 again.

That is, in this embodiment, as shown in FIG. 41, the treated water is the first and second anaerobic filter bed tanks 105, 1
After being treated at 10, it is sent to the contact aeration tank 114 and further to the precipitation tank 119. The treated water in the settling tank 119 is returned to the first anaerobic filter bed tank 105 via the electrolytic tank 159 together with the sludge to be settled. The treated water also flows from the settling tank 119 to the contact aeration tank 114 together with the sludge to be settled, and also from the contact aeration tank 114 to the second anaerobic filter bed tank 110 together with the sludge separated from the contact agent 15. The water to be treated flows in. The supernatant of the water to be treated in the settling tank 119 flows into the disinfecting tank 121. Then, the water to be treated in the disinfection tank 121 is sent to the treated water tank 1 through the drain port 123, so that the treated water tank 1 is subjected to a treatment for removing nitrogen oxides in a tertiary treatment.

In the present embodiment described above, the treated water tank 1 is installed on the downstream side of the electrolytic tank 159 for removing phosphorus, but the present invention is not limited to this, and it is installed on the upstream side of the electrolytic tank 159. May be.

Further, the tank 1 and the treated water tank 1 described above
Is mainly applied to large-scale wastewater treatment facilities that treat domestic wastewater and industrial wastewater, but the treated water tank 1 is installed after the pump for pumping groundwater or purified water, It can also be used to remove components.

In this embodiment, the treated water tank 1 is
It was installed in the latter stage of the tank 1, that is, so that the water to be treated after the secondary treatment was introduced. In addition, like this,
As a processing flow when using the treated water tank 1 as a device for the third treatment of the treated water, the treated water that has been subjected to anaerobic treatment and aerobic treatment is sent to the sand filtration raw water tank, and thereafter,
An example of such a flow is as follows: the water is sent to the sand filter device, further sent to the sand filtration treatment water tank, then sterilized in the disinfection tank, treated in the treatment water tank 1, and discharged to the outside of the facility.

As another flow, the anaerobic-treated and aerobic-treated water is circulated in the order of an intermediate flow rate adjusting tank, a coagulation tank, a coagulation-sedimentation tank, and an electrolytic cell for phosphorus removal, Part of the water to be treated in the electrolytic cell for phosphorus removal is sent to the anaerobic filter tank. It is also conceivable that the supernatant treated water in the coagulation sedimentation tank is sent to the disinfection tank, and then sent from the disinfection tank to the treated water tank 1 for treatment and discharged to the outside of the facility.

The treated water tank 1 may be used in the tank 1 as a part of the secondary treatment. As described above, the substance contained in the water to be treated that has been treated in the treated water tank 1 may inhibit the activity of microorganisms, so the treated water tank 1 is preferably installed in the settling tank 119. As a result, the device for removing phosphorus and nitrogen can be configured compactly. When the treated water tank 1 is installed in the tank 101, it is preferable to provide a mechanism for removing sludge in the treated water tank 1 and on the surfaces of the anode 3 and the cathode 4.

Further, the treatment at the final stage in the tank 101 should be the treatment in the disinfection tank 121.
Is preferably installed on the upstream side of the disinfection tank 121.

The lower end of the third partition wall 104 is attached to the tank 1
The contact aeration tank 114 and the treated water tank 119 may not be connected at the lower part by connecting to the inner wall of 01.

Also, the treated water tank 1 may be installed in the disinfection tank 121. Further, when the water treatment device is used as the tertiary treatment of the combined septic tank, as shown in FIG. 42, the diaphragm 2 in the treated water tank 1 may be omitted.

Further, in each of the embodiments described above, the cathode is made of devalta alloy or the like, but it may be made of silver, iron or the like.

It should be considered that the embodiments disclosed this time are exemplifications 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. Further, each of the embodiments may be used alone or in combination.
It can be implemented.

[Brief description of drawings]

FIG. 1 is a diagram schematically showing a nitrogen removing device which is a first embodiment of a water treatment device of the present invention.

FIG. 2 shows the p of the water to be treated in the nitrogen removing apparatus of FIG.
It is a figure which shows the relationship between H and the degree of nitrate nitrogen removal.

FIG. 3 is a diagram schematically showing a nitrogen removing device according to a second embodiment of the present invention.

FIG. 4 is a diagram schematically showing a nitrogen removing device according to a third embodiment of the present invention.

FIG. 5 is a diagram schematically showing a nitrogen removing device according to a fourth embodiment of the present invention.

6 is a diagram showing a detailed structure of the electrode of FIG.

FIG. 7 is a diagram showing a detailed structure of the electrode of FIG.

FIG. 8 is a diagram schematically showing a nitrogen removing device according to a fifth embodiment of the present invention.

FIG. 9 is a diagram schematically showing a nitrogen removing device according to a sixth embodiment of the present invention.

FIG. 10 is a diagram schematically showing a nitrogen removing device according to a seventh embodiment of the present invention.

FIG. 11 is a diagram schematically showing a nitrogen removing device according to an eighth embodiment of the present invention.

FIG. 12 is a diagram schematically showing a nitrogen removing device according to a ninth embodiment of the present invention.

FIG. 13 is a diagram schematically showing a nitrogen removing device according to a tenth embodiment of the present invention.

FIG. 14 is a diagram schematically showing a nitrogen removing device according to an eleventh embodiment of the present invention.

FIG. 15 is a diagram schematically showing a nitrogen removing device according to a twelfth embodiment of the present invention.

FIG. 16 is a diagram schematically showing a nitrogen removing device according to a thirteenth embodiment of the present invention.

FIG. 17 is a diagram schematically showing a nitrogen removing device according to a fourteenth embodiment of the present invention.

FIG. 18 is a diagram schematically showing a nitrogen removing device according to a fifteenth embodiment of the present invention.

FIG. 19 is a diagram schematically showing a nitrogen removing device according to a sixteenth embodiment of the present invention.

FIG. 20 is a diagram schematically showing a nitrogen removing device according to an eighteenth embodiment of the present invention.

FIG. 21 is a diagram schematically showing a nitrogen removing device according to an eighteenth embodiment of the present invention.

FIG. 22 is a diagram schematically showing a water treatment device which is a nineteenth embodiment of the water treatment device of the present invention.

FIG. 23 is a diagram schematically showing main electrolytic reactions on electrodes of the water treatment device of FIG. 22.

FIG. 24 is a diagram showing an example of the relationship between the time for which an electric current is passed between the electrodes of the water treatment apparatus of FIG. 22 and the degree of removal of nitrate nitrogen in the water to be treated.

FIG. 25 is a diagram schematically showing a water treatment device which is a twentieth embodiment of the present invention.

FIG. 26 is a diagram schematically showing a water treatment device according to a 21st embodiment of the present invention.

FIG. 27 is a diagram schematically showing a water treatment device according to a 22nd embodiment of the present invention.

28 is a perspective view of the separation membrane of FIG. 27. FIG.

FIG. 29 is a diagram schematically showing a water treatment device according to a 23rd embodiment of the present invention.

FIG. 30 is a diagram schematically showing a water treatment device according to a 24th embodiment of the present invention.

FIG. 31 is a diagram schematically showing a water treatment device according to a 25th embodiment of the present invention.

FIG. 32 is a diagram schematically showing a water treatment device according to a 26th embodiment of the present invention.

FIG. 33 is a diagram schematically showing a water treatment device according to a 27th embodiment of the present invention.

FIG. 34 is a diagram schematically showing a water treatment device according to the 28th embodiment of the present invention.

FIG. 35 is a diagram schematically showing a water treatment device according to the 29th embodiment of the present invention.

FIG. 36 is a diagram schematically showing a water treatment device according to a thirtieth embodiment of the present invention.

FIG. 37 is a diagram schematically showing a water treatment device according to the 31st embodiment of the present invention.

FIG. 38 is a diagram schematically showing a water treatment device according to the 32nd embodiment of the present invention.

FIG. 39 is a diagram schematically showing a water treatment device according to the 33rd embodiment of the present invention.

FIG. 40 is a diagram schematically showing a water treatment device according to the 34th embodiment of the present invention.

FIG. 41 is a diagram schematically showing a state in which the water treatment device of the thirty-fifth embodiment of the present invention is used as the tertiary treatment of the combined septic tank.

FIG. 42 is a diagram showing a modified example of the water treatment device shown in FIG. 41.

[Explanation of symbols]

1,80,202 Treated water tank, 2,2A, 2B, 40
Diaphragm, 2X recovery chamber, 3,4,95,96,203,2
04 electrode, 3A anode chamber, 4A cathode chamber, 5 DC power source, 6,61 alkali salt supply device, 20, 90, 22
0 control circuit, 21,223 pH sensor, 22,23
Water level sensor, 30 mixing tanks, 41, 66, 67, 82
Cartridge, 42 electrolysis tank, 50,250 reaction tank, 60 chloride supply device, 206 chemical supply device, 20
7,557 Stirrer, 214B drain valve, 28
0,310 separation membrane, 290 membrane separation tank, 300 solid-liquid separation tank.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Masataka Moriizumi             2-5-3 Keihan Hondori, Moriguchi City, Osaka Prefecture             Within Yo Denki Co., Ltd. (72) Inventor Fumiko Kondo             2-5-3 Keihan Hondori, Moriguchi City, Osaka Prefecture             Within Yo Denki Co., Ltd. (72) Inventor Naoki Kitayama             2-5-3 Keihan Hondori, Moriguchi City, Osaka Prefecture             Within Yo Denki Co., Ltd. F-term (reference) 4D050 AA02 AA12 AB34 BB04 BD03                       CA09 CA10                 4D061 DA02 DA08 DB11 DB19 DC14                       EA04 EA06 EB01 EB04 EB12                       EB28 EB29 EB30 EB31 EB33                       EB35 EB37 EB39 ED01 ED12                       ED20 FA09 FA14 FA15 FA16                       GA05 GA07 GC02 GC12 GC20

Claims (22)

[Claims] 1. A storage unit for storing water to be treated, and a first electrode pair provided in the storage unit, wherein a cathode of the first electrode pair is made of an alloy containing an amphoteric metal. Water treatment device that is a member of. 2. A storage part for storing the water to be treated, and a first electrode pair provided in the storage part, wherein the cathode of the first electrode pair is a component in the cathode that is eluted. A water treatment device, which is a first member made of an alloy containing a metal that forms a water-insoluble compound that acts as a coagulant in the accommodation portion. 3. The first member is an alloy containing copper as a main component, and the anode of the first electrode pair is formed by reducing the nitrogen oxides in the water to be treated by the first member. The water treatment device according to claim 1 or 2, which oxidizes the produced ammonium ions. 4. The first member is made of an alloy containing a metal having a higher ionization tendency than copper.
The water treatment device according to any one of 1. 5. A diaphragm for partitioning the inside of the housing into a first tank and a second tank, and a first anode which is immersed in the water to be treated in the first tank to form an anode.
A tank anode, and a second anode that is immersed in the water to be treated in the second tank to form a cathode
The water treatment device according to claim 1, further comprising a tank cathode and a first power supply that supplies electric power to the first tank anode and the second tank cathode. 6. A third tank which is a tank into which the water to be treated in the second tank is introduced, the third tank being different from the first tank and the second tank, and the third tank The water treatment device according to claim 5, further comprising an oxidant addition section for adding an oxidant. 7. The container further comprises an alkaline reagent charging member for charging an alkaline reagent supplying ions of an alkali metal or an alkaline earth metal in an aqueous solution,
The water treatment device according to any one of claims 1 to 6. 8. A pH detector for detecting pH in the container, and a dosage controller for controlling the dosage of the reagent by the alkaline reagent charging member based on the detection output of the pH detector. The water treatment device according to claim 7. 9. A nitrate ion electrode for detecting the nitrate ion concentration of the water to be treated in the housing portion, and a shield means provided between the first member and the nitrate ion electrode. The water treatment device according to any one of claims 1 to 8. 10. The method according to claim 1, further comprising an inflow section which is a water tank in which the water to be treated in the storage section is introduced and subjected to oxidation treatment.
The water treatment device according to claim 9. 11. The anode of the first electrode pair is an electrode made of stainless steel, a material containing a noble metal element, or a material coated with a material containing a noble metal element, or a carbon electrode. The water treatment device according to claim 10. 12. The water treatment device according to claim 1, wherein the first electrode pair is supplied with a constant electric current. 13. An accommodating part for accommodating water to be treated, an alkaline water generating part for making the solution in the accommodating part alkaline, and an acetic acid contained in the accommodating part, which contains copper as a main component and has an ionization tendency higher than that of copper. A water treatment device comprising: a first member that is made of an alloy containing a high metal and that reduces nitrogen oxides in the water to be treated in the housing portion. 14. The first member is installed in the accommodating portion in a powder form, a bulk form, a mesh form, a rod form, a plate form, a cylinder form, or a porous form.
The water treatment device according to any one of 1. 15. The water treatment apparatus according to claim 1, further comprising a stirring member that stirs the inside of the housing portion. 16. The storage unit is a hopper type, and a drain valve is provided at the bottom thereof.
5. The water treatment device according to any one of 5. 17. The water treatment apparatus according to claim 1, further comprising a separating unit that separates a solid and a liquid in the containing section. 18. The capacity is greater than or equal to the capacity of the accommodation portion,
The water treatment device according to any one of claims 1 to 17, further comprising a storage tank that stores the water to be treated that is sent to the storage unit. 19. The method according to claim 1, further comprising a water supply section for sending a part of the water to be treated in the storage section to the storage tank.
8. The water treatment device according to any one of 8. 20. An inflow valve through which the water to be treated flowing into the accommodation portion passes, a discharge valve through which the water to be treated discharged from the accommodation portion passes, and opening and closing of the inflow valve and the discharge valve are controlled. The water treatment device according to claim 1, further comprising a valve control unit. 21. The calcium compound charging part for charging a compound containing calcium is further included upstream of the first member of the housing part.
The water treatment device according to any one of 1. 22. The water treatment device according to claim 1, wherein the water to be treated after biological treatment is introduced into the storage portion.