KR20110039594A

KR20110039594A - Mixed oxidants generator

Info

Publication number: KR20110039594A
Application number: KR1020090096509A
Authority: KR
Inventors: 박정일
Original assignee: 박정일
Priority date: 2009-10-12
Filing date: 2009-10-12
Publication date: 2011-04-20

Abstract

The present invention relates to a mixed oxidant generator, and to a device for generating a mixed oxidant by electrolysis of water.

The present invention provides an electrolysis tank 10 in which a water treatment process is performed, at least one pair of electrodes 21 and 23 disposed in the electrolysis tank 10 and including an anode and a cathode, and the pair of electrodes. In the mixed oxidizer generator, characterized in that it comprises a power supply unit 30 for applying power to (21, 23), the components of the pair of electrodes are carbon, titanium, titanium nitride (titanium nitride), Stainless steel, zirconium, ceramic, tantalum, nickel, tin, palladium, rhodium, ruthenium or a combination thereof. According to the mixed oxidant generating device according to the present invention, by configuring the electrode in a new material and shape, it is possible to further speed up the treatment of contaminated water, and to reduce the cost of decomposition of the hardly decomposable organic material.

Description

Mixed Oxidants Generator

Chlorine is widely used as a disinfectant for water treatment because of its simple handling, relatively easy management of residual concentrations, and low operating costs. However, protozoans resistant to chlorine have been detected, and there is a disadvantage in that a large amount of chlorine needs to be injected to disinfect them effectively. On the other hand, when a large amount of chlorine is injected, there is a risk of increasing the production of chlorine hydrate, HAAs (Haloacetic acids) and THMs (Trihalomethanes), which are harmful by-products, which are harmful to the human body. Due to these limitations, interest in the process of replacing chlorine disinfection has increased, and research into the electrochemical process of electrolyzing water as an alternative disinfection method is actively conducted. Electrochemical disinfection is an environmentally friendly process in that electrons are used, unlike conventional disinfection methods using chemical disinfectants. Also has the advantage of the automation of the process can be easily and running cost is low, and the mixed oxidant, such as various O _3, H ₂ O _2, o OH (OH radicals) with chlorine is produced at the same time remove the disinfecting effect and the organic .

The apparatus for generating mixed oxidants such as O ₃ , H ₂ O ₂ , and OH radicals is applied to a water treatment process for purifying hardly decomposable organic matter. For example, water treatment using ozone is a method of utilizing the strong oxidizing power of ozone, has excellent sterilizing effect, and can kill bacteria even by a small amount of ozone. Thus, ozone is widely used as a disinfectant in water purification processes.

Conventional ozone bubble method produces mixed oxidant by dissolving ozone in water. In general, the ozone bubble method is slow and economical due to the slow processing speed and the high cost of chemicals and process management to decompose hardly decomposable organic substances. In the various water treatment processes, there was a problem that the efficiency of dissolving ozone in gaseous state was low, the rate of self-decomposition of dissolved ozone was lowered at low pH, and the reaction to hardly decomposable organic substances was selectively performed.

Therefore, the present invention has been invented to solve the conventional problems as described above, the object of the present invention is to use a new material and shape of the electrode, the processing speed is fast, decomposes the hardly decomposable organic matter and costs less mixed oxidant It is to provide a generator.

Furthermore, by using a cationic electrolyte membrane to control the amount of mixed oxidant to provide a mixed oxidant generator for the purpose of use.

According to a feature of the present invention for achieving the above object, the present invention is an electrolysis tank in which a water treatment process is carried out, at least a pair of electrodes installed in the electrolysis tank, including a positive electrode and a negative electrode, and In the mixed oxidizer generator, characterized in that it comprises a power supply for applying power to a pair of electrodes, the components of the pair of electrodes are carbon, titanium, titanium nitride (titanium nitride), stainless steel, zirconium , Ceramics, tantalum, nickel, tin, palladium, rhodium or combinations thereof.

In this case, a coating layer is formed on a part or the whole of the electrode surface, and the components of the coating layer are composed of platinum compound, iridium compound, tin compound, titanium compound, palladium compound, tantalum compound, rhodium compound, ruthenium compound, or a combination thereof. It may be selected from the group.

And the thickness of the coating layer of the electrode is in the range of 1 to 5㎛, the interval of the pair of electrodes may be in the range of 0.5 to 1.1mm.

In addition, the electrode may be in the form of any one of a plate-like, mesh-shaped, cylindrical having a plurality of holes. In addition, the amount of mixed oxidant generated by installing a cationic electrolyte membrane between the electrodes can be increased or decreased.

In this case, the power supply unit may be any one of a DC voltage, a pulse voltage, a square wave pulse voltage, a time-division control pulse voltage, and an alternate pulse voltage to the pair of electrodes. Power can be applied to the electrode.

The power supply unit may include a control panel or an operation button for applying power to the pair of electrodes, and may change the direction of the electrode supplied to the pair of electrodes through the control panel.

According to the mixed oxidant generator according to the present invention, the following effects can be expected.

That is, by configuring the electrode of the mixed oxidizer generator with a new material and shape, it is possible to further speed up the treatment of contaminated water, and to reduce the cost of decomposition of the hardly decomposable organic material.

In addition, according to the mixed oxidizer generating device according to the present invention, the dissolving ability of gaseous ozone is excellent, and the decomposition rate of dissolved ozone is excellent even at low pH.

In addition, according to the mixed oxidizer generator according to the present invention, there is an advantage that can improve the selective reactivity that does not react with a specific organic material, or the reaction rate is lowered for a specific organic material.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the mixed oxidizer generating apparatus according to the present invention as described above will be described in detail.

1 is a block diagram showing a schematic configuration of a mixed oxidizer generating apparatus according to a specific embodiment of the present invention. 2 is a plan view showing a pair of electrodes constituting a specific embodiment of the present invention.

As shown in FIG. 1, the mixed oxidant generator according to a specific embodiment of the present invention includes an electrolysis tank 10 performing a water treatment process. The electrolysis tank 10 provides a space in which a water treatment process for purifying hardly decomposable organic matter is performed. The electrolysis tank 10 includes a pair of electrodes 21 and 23 so that an electrolysis reaction occurs. The electrolysis reaction is generated by supplying a direct current to the pair of electrodes 21 and 23.

The DC current is supplied by the power supply unit 30. In the mixed oxidant generating device according to a specific embodiment of the present invention, it has been described that the DC current is supplied by the power supply unit 30, but the power supplied by the power supply unit 30 is not necessarily limited to the DC voltage. no. That is, the power supply unit 30 may not only output a DC voltage but also a pulse voltage, a square wave pulse voltage, a pulse voltage controlled by time division, and an alternate pulse voltage. By supplying to the electrolysis reaction can be caused. In addition, the battery and the rechargeable battery can be applied to the pair of electrodes.

As shown in FIG. 2, the pair of electrodes 21 and 23, which are supplied with power from the power supply unit 30, have a rectangular plate shape having a relatively thin thickness. The pair of electrodes 21 and 23 are composed of a positive electrode 21 and a negative electrode 23, and the shapes of the positive electrode 21 and the negative electrode 23 are symmetrical to face each other. Is formed. A plurality of holes 25 are formed in the positive electrode 21 and the negative electrode 23 at regular intervals. The plurality of holes 25 serves as a passage for circulating water introduced into the electrolysis tank 10 to improve the effect of the electrolysis reaction. In a specific embodiment of the present invention, the electrodes 21 and 23 have been described as being flat plates having a plurality of holes, but are not necessarily limited thereto. That is, the electrodes 21 and 23 may be formed in a mesh shape or a cylindrical shape in which a plurality of holes are formed. In addition, the amount of mixed oxidant generated by installing a cationic electrolyte membrane between the electrodes 21 and 23 can be adjusted.

The pair of electrodes 21 and 23 are formed at intervals of 0.5 to 1.1 mm. The gap between the electrodes 21 and 23 is maintained by the support member 27. The support member 27 is mounted to the electrolytic bath 10 integrally with the pair of electrodes 21 and 23. For example, the support member 27 may be seated on the bottom surface or the side wall surface of the electrolysis tank 10. The cationic electrolyte membrane may be fixed by using the support member 27.

A coating layer is formed on part or the whole of the surface of the electrodes 21 and 23. The coating layer is formed of a component selected from the group consisting of platinum compounds, iridium compounds, tin compounds, titanium compounds, palladium compounds, tantalum compounds, rhodium compounds, or a combination thereof. At this time, the thickness of the coating layer is formed within 5㎛ to prevent the occurrence of wear, and to prevent the desorption of the coating layer by the droplets of the electrode surface.

The power supply unit 30 is driven by the PCB. And it has a control pad or an operation button for driving the power supply 30 separately. In addition, in order to solve the problem of erosion of the electrodes (21, 23) it can be driven to alternate the direction of the current through the PCB.

In a specific embodiment of the present invention, it has been described that a pair of electrodes 21 and 23 are provided. However, the present invention is not limited thereto and may be configured as one or more pairs of electrodes according to design conditions and water treatment processes.

In general, ozone and hydrogen peroxide are produced by the oxidation reaction at the anode and the reduction reaction at the cathode during water electrolysis.

[Anode, Anode]

H ₂ O → H ^{+ +} (o OH) _ads + e ^-

(O _{OH) ads → (O) ads} or O 2 + H + + e -

(O) _ads + O ₂ → O ₃

Cathode

_{^{O 2 + 2H + + 2e -}} → H 2 O 2

OH radicals are partly HO ₂ when the H ₂ O ₂ to react with the water in the weak ^acid-as dissociated (hydroperoxide ion) is generated as follows.

_{H 2 O 2 + H 2 O} <-> HO 2 - + H 3 O -

O ₃ + HO ₂ ^- → o OH + O ₂ ^- + O ₂

_{^{O 3 + O 2 - → O}} 3 - + O 2

_{^{O 3 - + H + <-}} > o HO ₃

ㅇ HO ₃ O + O ₂ → OH

The oxidation of O ₃ in water is largely divided into the direct reaction by O ₃ molecules and the indirect reaction of OH radicals produced by the decomposition of O ₃ .

In summary, O and O ₂ molecules formed by electrolysis of water combine to form ozone. Next, hydrogen peroxide is produced by the electrolysis of oxygen or by the bonding of OH radicals, which are intermediate products produced by the decomposition of ozone.

After Cl ⁻ ions present in water bind with Cl _2, they react with H ₂ O to generate HOCl.

The OH radical is if the direct measurement is not possible, but the ozone due to disappear was instantaneously present in the water, OH ^- or the conjugate base of HO ₂ of the hydrogen ^{peroxide-forming} a and radical chain cycle reaction, and finally the OH To generate radicals.

Microorganisms present in water are inactivated or removed by the resulting mixed oxidant. That is, bacteria are removed by electrosorption and other microorganisms are removed by direct electrolysis by reaction with e ⁻ . Looking at this in more detail, it is as follows.

Microorganism → Electrosorption → Inert

M + O ₃ → Inactivaton

M + OH ^- → inert (Inactivaton)

M + HOCl → Inactivaton

Microorganisms (Microorganics) → e - → M -

M + O ₃ → Product

M + OH ^- → Product

M + HOCl → Product

That is, the oxidizing and sterilizing action is performed smoothly by the mixed oxidants (O ₃ , H ₂ O ₂ , HOCl, OH radicals) generated during the electrolysis of water. After the electrolysis is performed, high sterilizing power is maintained by high residual HOCl and anion.

As described above, according to the mixed oxidant generating device according to a specific embodiment of the present invention, the ability to dissolve gaseous ozone is superior to the conventional ozone bubble method. In addition, since hydrogen peroxide is generated at the same time, there is an advantage in that a large amount of OH radicals can be generated by increasing the rate of autolysis of dissolved ozone even at a low pH. Furthermore, it is possible to efficiently purify the acidic solution (such as wastewater) and general tap water having a low pH, and there is an advantage in that the amount of dissolved oxygen in the water is increased after the water treatment.

In addition, while excellent in the performance and efficiency of mixed oxidant generation, there is an advantage that the structure of the electrolysis electrode is simple, so easy to manufacture.

The rights of the present invention are not limited to the embodiments described above, but are defined by the claims, and those skilled in the art can make various modifications and adaptations within the scope of the claims. It is self-evident.

1 is a block diagram showing a schematic configuration of a mixed oxidant generator without an ion separation membrane according to a specific embodiment of the present invention.

2 is a plan view showing a pair of electrodes constituting a specific embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

10: electrolysis tank 21: anode electrode

23: cathode electrode 25: hole

27: support member 30: power supply

Claims

An electrolysis tank in which the water treatment process is performed;

At least a pair of electrodes installed in the electrolysis tank and including an anode and a cathode;

In the mixed oxidizer generator, characterized in that it comprises a power supply for applying power to the pair of electrodes,

The components of the pair of electrodes are selected from the group consisting of carbon, titanium, titanium nitride (titanium nitride), stainless steel, zirconium, ceramic, tantalum, nickel, tin, palladium, rhodium, or a combination thereof. Mixed oxidant generator.

The method of claim 1,

A coating layer is formed on part or all of the electrode surface, and the components of the coating layer are from a group consisting of platinum compound, iridium compound, tin compound, titanium compound, palladium compound, tantalum compound, rhodium compound, ruthenium compound or a combination thereof. Mixed oxidant generator, characterized in that selected.

The method of claim 2,

The thickness of the coating layer of the electrode is in the range of 1 to 5㎛, the interval of the pair of electrodes is mixed oxidizer generator, characterized in that the range of 0.5 to 1.1mm.

4. The method according to any one of claims 1 to 3,

The electrode is mixed oxidant generator, characterized in that any one of the form of a plate-like, mesh-shaped, cylindrical having a plurality of holes.

4. The method according to any one of claims 1 to 3,

And the power supply unit applies any one of a DC voltage, a pulse voltage, a square wave pulse voltage, a time division control pulse voltage, and an alternating pulse voltage to the pair of electrodes.

4. The method according to any one of claims 1 to 3,

Mixed oxidizer generator, characterized in that for applying to the pair of electrodes using a battery or a rechargeable battery as the power supply of the power supply.

4. The method according to any one of claims 1 to 3,

A mixed oxidizer generator, characterized in that an ion separator is provided between the electrodes.

4. The method according to any one of claims 1 to 3,

Mixed oxidizer generator, characterized in that there is no ion separator between the electrodes.

6. The method according to any one of claims 1 to 5,

And a power supply unit capable of supplying power to the pair of electrodes when the power is supplied to the pair of electrodes.