KR20010048824A - The waterwaste treatment system for simultaneously occurring electrolysis reaction and photooxidation reaction - Google Patents

Abstract

PURPOSE: Provided is a wastewater treatment system, which is characterized in that electrolysis and photo-oxidation reaction are conducted in the same reactor (14). Because ferric ion is eluted from electrodes in case of electrolysis reaction, chemical for fenton oxidation is not needed to be injected, also hydrogen peroxide is injected, and simultaneously ultraviolet rays is irradiated, thereby enhancing the treatment. CONSTITUTION: The system comprises a reactor (14) equipped with an inlet (16) and an outlet (18) and a chamber (32) being the atmosphere pressure therein; a lamp (12) installed therein for irradiating ultraviolet rays; electrodes, being one metal selected from steel, aluminum, titanium and stainless steel, arranged in a row on both sides of the lamp.

Description

Wastewater treatment system which causes electrolysis and photooxidation at the same time {THE WATERWASTE TREATMENT SYSTEM FOR SIMULTANEOUSLY OCCURRING ELECTROLYSIS REACTION AND PHOTOOXIDATION REACTION}

The present invention relates to a wastewater treatment system, and more particularly, to a wastewater treatment system for simultaneously causing an electrolysis reaction and a photooxidation reaction.

In general, the treatment of wastewater can be classified into physical and chemical treatments and biological treatments, and the physical and chemical treatments can be broadly divided into electrolysis and photooxidation treatments.

Electrolysis treatment is the most common method of wastewater treatment and is effective at removing oil, inorganic contaminants, organic contaminants and colloidal contaminants and can treat high concentrations of contaminated wastewater relative to the size of the device.

In addition, the photo-oxidation treatment is to decompose organic matter into O ₂ and H ₂ O by irradiating ultraviolet rays after adding oxidant to the waste water, which is effectively used for waste water containing phenol or organic chlorine compound which is difficult to be decomposed by biological treatment. It is becoming.

However, in the electrolysis facility, when the concentration of pollutants to be removed in the waste water is low, the reaction rate of the material to be treated is slow, and the treatment becomes difficult, and when the electrolysis is performed for a long time, the electrode rods become faster. Of course, there is a problem that the scale is generated in the electrode, the waste water treatment efficiency is only about 40 to 50%.

In addition, even in a mineralization facility using an oxidizing agent such as ultraviolet light and hydrogen peroxide, when the waste water has a chromaticity or turbidity, the hydrogen peroxide interferes with the absorption of the ultraviolet light, resulting in a long reaction time, and the consumption of hydrogen peroxide increases. There is a problem that not only reduces the efficiency of the treatment, but also increases the cost of the treatment.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and a first object of the present invention is to provide a wastewater treatment system having maximum wastewater treatment efficiency at a low cost.

It is a second object of the present invention to provide a wastewater treatment system which shortens the reaction time of wastewater treatment.

A third object of the present invention is to provide a wastewater treatment system capable of performing Fenton oxidation treatment without separately adding iron sulfate or iron chloride.

A fourth object of the present invention is to provide a wastewater treatment system which simultaneously generates an electrolysis reaction and a photooxidation reaction.

1 is a view showing an example of a wastewater treatment system for simultaneously causing an electrolysis reaction and a photooxidation reaction according to the present invention.

2 is a top view of the wastewater treatment system.

FIG. 3 is a cross-sectional view of the wastewater treatment system of FIG. 1 taken along a line A-A ', illustrating an operation state in which an electrode is electrically connected to or insulated from a conductive wire. FIG.

<Explanation of symbols for main parts of drawing>

100: wastewater treatment system

10: quartz tube

12: cylindrical lamp (ultraviolet lamp)

14: reactor

16: funnel

18: outflow

20 _{1 to n} : electrode

22: fixed notes

24: lead wire

26 socket

28: Euro

30: sheath

32: waiting room

34: lamp electrode

The above objects are achieved by the present invention as set forth in the following claims, and according to the present invention according to claim 1, a wastewater treatment system for simultaneously causing an electrolysis reaction and a photooxidation reaction, having an inlet and an outlet. A reactor having a waiting room in the inner center, a cylindrical lamp inserted into the waiting room of the reactor to emit ultraviolet rays, and symmetrically installed on the left and right sides of the cylindrical lamp so as to elute predetermined ions in the waste water by an electrolysis reaction, the conductors being axially At least one electrode arranged in parallel in the doughnut shape up and down.

According to the present invention, since the electrolytic reaction and the photooxidation reaction are implemented in one reactor, both the advantages of the electrolysis reaction wastewater treatment and the advantages of the photooxidation wastewater treatment can be obtained. have. In addition, since the electrodes are arranged up and down in parallel in a donut shape with the lead wires in place to elute the iron ions, no separate chemicals such as iron sulfate and iron chloride need to be injected during the Fenton oxidation treatment, so that the effective wastewater treatment can be performed at a low price. Can be.

Furthermore, according to the present invention according to claim 2, wherein the electrodes symmetrically installed on the left and right sides of the cylindrical lamp are electrically connected to the conductor as at least one component selected from iron, aluminum, titanium and stainless steel. It is configured to be conductive or insulated, and at the same time as the hydrogen peroxide is supplied during the electrolysis reaction, ultraviolet rays are irradiated by the cylindrical lamp so that the electrolysis reaction and the photooxidation reaction occur simultaneously, thereby accelerating the wastewater treatment reaction.

According to the present invention, by introducing hydrogen peroxide during the electrolysis reaction and irradiating ultraviolet rays and simultaneously causing the photooxidation reaction, not only the amount of hydrogen peroxide but also the amount of sludge generated is reduced, the wastewater treatment time is shortened, and the cost of wastewater treatment is also reduced. It is effective to become cheap.

Hereinafter, a wastewater treatment system according to the present invention will be described with reference to the drawings.

1 is a view showing a wastewater treatment system for simultaneously causing an electrolysis reaction and a photooxidation reaction according to the present invention, and FIG. 2 is a top view of the wastewater treatment system. Now, the present invention will be described with reference to Figs. 1 and 2, and the wastewater treatment operation will be described after the configuration of the wastewater treatment system is first described.

[Configuration]

According to the present invention, the wastewater treatment system 100, which simultaneously implements the electrolysis reaction and the photooxidation reaction in one reactor, is protected from the outside by the outer wall 14. The outer wall 14 is each provided with an inflow path 16 through which wastewater flows in and an outflow path 18 through which purified water after the electrolysis and photooxidation reactions are discharged. The wastewater treatment system (also referred to as a "reactor" or "reactor cell") 100 can be broadly divided into a central part, a right part, and a left part with respect to the quartz tube 10.

At the center of the wastewater treatment system 100, there is a waiting room 32 having an atmospheric pressure, and a cylindrical ultraviolet lamp 12 extending to a predetermined length in the longitudinal direction is inserted into the waiting room 32. The lamp 12 is connected via a socket 26 to a ballast, not shown. The ultraviolet lamp 12 is preferably a low pressure mercury lamp of 110 W as an ultraviolet irradiation light source, and has a function of adjusting the wavelength of light according to the type of organic matter contained in the waste water. The quartz tube separating the boundary and surrounding the lamp 12 is a transparent material and effectively transmits ultraviolet rays emitted from the lamp to the outside.

The upper and lower ends are fixed to the left and right sides of the center by the fixing notes 22, respectively, and the conductive wires 24 connected to the power supply terminals (not shown) are provided. The conducting wire 24 is surrounded by the sheath 30, but is exposed and insulated at the portion contacting the inner radial surface of the donut-shaped electrode 24 to conduct or interrupt the current. This will be described later in more detail with reference to FIG. 3. On the other hand, the donut-shaped electrodes 20 ₁ , 20 ₂ , 20 ₃ , 20 ₄ ... 20 _n around the conducting wire 24 are in contact with or insulated from the conducting wire 24 at the center inner diameter thereof. This electrode may be composed of iron, aluminum, platinum and stainless steel. As shown in the figure, each electrode is spaced apart by a distance of a predetermined distance, one end is fixed to the reactor outer wall 14 and the other end maintains a certain distance between the quartz tube 10 to maintain the flow path 28 Forming. On the other hand, the electrode may be fixed by the fastener by the outer wall or by the pressure of the outer wall by insertion without the fastener. The flow path 28 acts as a passage for the wastewater that forms and moves turbulence by being subjected to the electrolysis reaction and the photooxidation reaction simultaneously.

As shown in Figure 2, the wastewater treatment system 100 of the present invention is a cylindrical shape as a whole, it can be seen that each component is also installed in a cylindrical shape therein, respectively.

FIG. 3 is a cross-sectional view of the wastewater treatment system of FIG. 1 taken along the direction A-A ', to illustrate a state in which an electrode is electrically connected to or insulated from a conductive wire. FIG. In FIG. 3, the same components as those shown in FIGS. 1 and 2 are denoted by the same reference numerals, and detailed description thereof will be omitted. As described above, a plurality of electrodes 20 ₁ , 20 ₂ , 20 ₃ , 20 ₄ ... 20 _n are in contact with the left and right symmetrical portions of the ultraviolet lamp 12 through the conductive wires 24. . The coating (30 in FIG. 1) is peeled off and connected to the electrically conductive state at the contact portion between the conductive wire 24 and each electrode, or is electrically insulated by the insulators 36, 38, 40 and 42. Such an insulator is formed in a zigzag pattern for each electrode as shown in the drawing. For example, an insulator 36 is formed on the electrode 20 ₁ corresponding to the same level, while an insulator is not formed on the electrode symmetrical thereto. not. When a positive voltage is applied to one of the conductors 24 and a negative voltage is applied to the other, the electrode 201 having no insulator has a positive polarity and the electrode 20 ₁ having the insulator is formed. It has a negative polarity. Therefore, the upper and lower electrodes formed on the same axis have polarities opposite to each other. When a voltage is applied to the conductive wire during the wastewater treatment, Fe ^{+ 2} ions are eluted from the positively charged iron electrode and two electrons 2e ⁻ are emitted from the negatively charged iron electrode.

[action]

Looking at the wastewater treatment operation according to the configuration of the present invention, first, through the inlet path 16, the adjusted water containing the hydrogen peroxide and the pH adjusted is introduced, wherein the ultraviolet lamp 12 is turned on as an appropriate wavelength The ultraviolet rays start to emit, and a voltage is applied to each of the conductors 24. Each electrode of the top and bottom by the applied voltage, respectively, and takes on a different polarity, in the iron electrode positively charged soon as Fe ⁺² ions are eluted at the same time the iron electrode negatively charged two electrons (2e ^-) is discharged . The eluted Fe ⁺² ions react with hydrogen peroxide introduced into the wastewater to generate OH radicals, while the two electrons serve to prevent recombination of hydrogen peroxide decomposed by ultraviolet light. As such, not only hydrogen peroxide recombination is prevented by the two electrons emitted, but hydrogen peroxide is generated through a chemical reaction as shown in the following equation, and thus the consumption of hydrogen peroxide can be reduced. To induce, there is no need to inject a separate chemical to react with hydrogen peroxide, such as iron chloride.

[Equation 1]

^{_{Fe 2+ + H 2 O 2 →}} Fe 3+ + HO - + HO ·

^{_{2e - + 2O 2 → 2O 2}} -

^{_{4O 2 - + 4H 2 0 →}} 4HO · + 4HO + 2O 2

The former also participates in the reduction reaction of heavy metals. When the reaction is performed in an acidic region, the effect is further increased. In this case, as the reaction proceeds, the pH is increased by the hydrogen gas generated at the anode, and there is no need for a neutralization process due to the pH increase. Further, when using iridium-coated titanium and platinum as the material of the electrode, the sludge generated in addition to the sludge generated during the decomposition of the contaminants is not generated. The purified water neutralized through this process is discharged as a supernatant separated into sludge after being moved to a sediment pressurized flotation tank (not shown) through the outflow path 18 and pH adjusted again.

According to the present invention, since predetermined ions are eluted by the electrode causing the electrolysis reaction, there is no need to inject a separate chemical agent such as iron chloride and iron sulfate for causing the Fenton reaction, and the electrons are released simultaneously with the predetermined ions. Since the hydrogen peroxide not only prevents recombination of hydrogen peroxide but also generates hydrogen peroxide by a chemical reaction, waste water treatment costs are reduced because there is no need to continuously add hydrogen peroxide for the Fenton oxidation reaction treatment as in the conventional art. .

In addition, by introducing hydrogen peroxide during the electrolysis reaction and simultaneously irradiating ultraviolet rays to cause photooxidation reaction, not only the amount of hydrogen peroxide but also the amount of sludge generated and the wastewater treatment time are shortened.

As mentioned above, although the embodiment which concerns on this invention was described with reference to drawings, this is only an Example for understanding this invention, It can be made that various corrections and changes can be made within the scope of the technical idea of this invention. Those skilled in the art will recognize.

For example, although one embodiment of the present invention describes a wastewater treatment apparatus for simultaneously causing an electrolysis reaction and a photooxidation reaction, the electrolysis reaction and the photooxidation reaction may be selected and operated alone according to the type of wastewater and the treatment method thereof. .

In addition, although the ultraviolet lamp has a cylindrical long rod structure, various types of lamps can be applied as long as it emits ultraviolet rays. Furthermore, various types of lamps such as low pressure mercury lamp, high pressure mercury lamp, xenon lamp, and deuterium lamp can be used. May be used.

In addition, in the embodiment of the present invention, hydrogen peroxide is used to induce the Fenton oxidation reaction, but various oxidants such as ozone and hypochlorous acid including hydrogen peroxide may be used.

In addition, although only one wastewater treatment system is illustrated and described in the embodiment, the wastewater treatment system may be connected in parallel according to the difficulty of degrading wastewater.

Therefore, the present invention should not be limited by the above embodiments, but should be limited based on the present invention described in the claims below.

Claims (2)

In the wastewater treatment system which causes the electrolysis reaction and the photooxidation reaction simultaneously, A reactor having an inlet and an outlet and having a waiting room at an inner center thereof; A cylindrical lamp inserted into a waiting room of the reactor to emit ultraviolet rays; And at least one electrode disposed symmetrically on the left and right sides of the cylindrical lamp and arranged up and down in parallel in a donut shape with the axis of the conductor in order to elute predetermined ions in the wastewater by an electrolysis reaction. According to claim 1, Electrodes symmetrically installed on the left and right sides of the cylindrical lamp is configured to be electrically conductive or insulated from the wire as at least one component selected from iron, aluminum, titanium and stainless steel, Hydrogen peroxide is supplied at the time of the electrolysis reaction and ultraviolet rays are irradiated by the cylindrical lamp to simultaneously generate an electrolysis reaction and a photooxidation reaction to accelerate the wastewater treatment reaction.