Catalytic ozonation device, treatment system and method for advanced treatment of wastewater

Abstract

The invention discloses a catalytic ozonation device, a treatment system and a method for advanced treatment of wastewater, and belongs to the technical field of water treatment. The device comprises a reaction tank body, a hydrogen peroxide input assembly and a circulating wastewater ozone projection assembly, and the hydrogen peroxide input assembly comprises a water inlet pipeline, a water inlet pump, a hydrogen peroxide pipeline, a hydrogen peroxide dosing pump and a hydrogen peroxide mixer; the hydrogen peroxide mixer is sequentially connected with a water inlet pipeline consisting of a water inlet pipeline and a water inlet pump and a hydrogen peroxide pipeline consisting of a hydrogen peroxide pipeline and a hydrogen peroxide dosing pump, and the hydrogen peroxide mixer is connected to a wastewater inlet; the circulating wastewater ozone projection assembly comprises a circulating pipeline, a circulating pump and an ozone microbubble projector, one end of the circulating pipeline is connected to the circulating water outlet, the other end of the circulating pipeline is connected to the circulating pump, and the circulating pump is connected to the circulating water inlet and the ozone microbubble projector, so that circulating water and ozone enter the reaction tank body together.

Description

Technical Field

[0001] The present invention belongs to the technical field of water treatment, and specifically relates to an ozone catalytic oxidation device, a treatment system and a method for deep treatment of wastewater, wherein the wastewater includes pharmaceutical wastewater and the like. Background Art

[0002] When ozone and hydrogen peroxide oxidation are used as pretreatment or deep treatment processes to treat refractory wastewater, ferrous sulfate (FeSO4) is usually added to cause a Fenton reaction under strong acidic conditions, which stimulates the decomposition of hydrogen peroxide into hydroxyl radicals, and uses the free radicals to degrade refractory pollutants in the wastewater. This Fenton reaction is complex to operate, requires a large amount of reagents, is costly, and produces a large number of byproducts such as chemical sludge.

[0003] In order to solve the above problems, after searching, patent document CN116216911A discloses a baffled ozone hydrogen peroxide combined catalytic oxidation reaction tank, including a reaction tank, the interior of the reaction tank is divided into a primary reaction zone, a secondary reaction zone, a tertiary reaction zone, and a quaternary reaction zone, an ozone excitation catalyst is arranged in the middle of the four reaction zones, a wastewater inlet pipe communicating with the primary reaction zone is arranged on the upper part of the reaction tank, a hydrogen peroxide mixer is arranged on the wastewater inlet pipe, a hydrogen peroxide inlet is arranged on the hydrogen peroxide mixer, an ozone microporous aeration disk is arranged at the bottom of the reaction tank, a water gallery 1 is arranged at the bottom of the partition plate of the primary reaction zone and the secondary reaction zone, a water gallery 2 is arranged at the top of the partition plate of the secondary reaction zone and the tertiary reaction zone, a water gallery 3 is arranged at the bottom of the tertiary reaction zone and the quaternary reaction zone, and a wastewater outlet pipe is connected to the upper part of the quaternary reaction zone.

[0004] The patent can repeatedly and efficiently stimulate ozone and hydrogen peroxide to produce hydroxyl radicals, and improve the transmission efficiency through multiple co-directional and reverse gas-liquid movements, so that hydrogen peroxide and ozone can fully contact. However, the single ozone oxidation process has low oxygen dissolution efficiency and low ozone utilization rate. Summary of the invention

[0005] 1. Problem to be solved

[0006] In view of the technical problems in the prior art, the purpose of the present invention is to propose an ozone catalytic oxidation device, a treatment system and a method for deep treatment of wastewater, which can efficiently excite ozone and hydrogen peroxide to produce hydroxyl radicals and effectively improve the low ozone utilization rate.

[0007] 2. Technical solution

[0008] In order to solve the above problems, the technical solution adopted by the present invention is as follows:

[0009] The first aspect of the present invention provides an ozone catalytic oxidation device for deep treatment of wastewater, comprising:

[0010] A reaction tank body, on which a circulating water outlet, a circulating water inlet, a wastewater outlet and a wastewater inlet are arranged;

[0011] A hydrogen peroxide input component, the hydrogen peroxide input component comprises an inlet pipe, an inlet pump, a hydrogen peroxide pipe, a hydrogen peroxide dosing pump and a hydrogen peroxide mixer, the hydrogen peroxide mixer is sequentially connected to an inlet pipeline composed of the inlet pipe and the inlet pump, and a hydrogen peroxide pipeline composed of the hydrogen peroxide pipe and the hydrogen peroxide dosing pump, and the hydrogen peroxide mixer is connected to a wastewater inlet; wastewater enters from the wastewater inlet through the inlet pipe and the inlet pump; hydrogen peroxide is input into the hydrogen peroxide mixer through the hydrogen peroxide pipe and the hydrogen peroxide dosing pump, and then is completely mixed with wastewater and enters the reaction tank body;

[0012] And a circulating wastewater ozone projection component, which includes a circulating pipeline, a circulating pump and an ozone microbubble projector. The ozone microbubble projector is installed obliquely at an angle of 40-50° on the bottom of the reaction tank body. The ozone microbubble projector contains a Venturi component. One end of the circulating pipeline is connected to the circulating water outlet, and the other end is connected to the circulating pump. The circulating pump is connected to the circulating water inlet and the ozone microbubble projector, so that the circulating water enters the reaction tank body together with the ozone.

[0013] It should be noted that the ozone microbubble projector contains a Venturi component, which includes a baffle and a cutting filler. The circulating wastewater passes through the Venturi component to absorb ozone and become dense bubbles. After passing through the baffle and the cutting filler again, the ozone is transformed into nano-scale tiny bubbles through the ozone microbubble projector through collision and cutting. The bubbles diffuse into each level of reaction zone, run through the entire reaction zone, and reach the top of the reaction tank after catalytic oxidation reaction with the wastewater, hydrogen peroxide and ozone.

[0014] According to any embodiment of the first aspect of the present invention, the ozone microbubble projectors are installed obliquely at an angle of 45° and are arranged around the bottom of the reaction tank, and the number of the ozone microbubble projectors is 4 groups.

[0015] According to any embodiment of the first aspect of the present invention, the ozone microbubble projector is arranged at the bottom of the reaction tank.

[0016] According to any embodiment of the first aspect of the present invention, the reaction tank body is a cylindrical tank body, the material of which is SUS316L or above, the height-to-diameter ratio of the reaction tank body is 2:1 to 4:1, and the volume is determined by the hydraulic retention time (HRT), and the general hydraulic retention time (HRT) is 2 to 4 hours.

[0017] According to any embodiment of the first aspect of the present invention, a bottom plate for balancing is arranged below the reaction tank.

[0018] According to any embodiment of the first aspect of the present invention, the reaction tank is provided with a sight glass.

[0019] According to any embodiment of the first aspect of the present invention, an ozone tail gas discharge port is installed on the top of the reaction tank.

[0020] According to any embodiment of the first aspect of the present invention, the ozone microbubble projector is connected to an ozone inlet pipe, and an ozone generator is at the end of the ozone inlet pipe.

[0021] The ozone microbubble projector used in the present invention operates over a wide pressure range and requires only a small pressure difference between the inlet and outlet sides to initiate a vacuum at the suction port. The internal mixing blades of the ozone microbubble projector generate thousands of microbubbles, increasing the surface area of ​​ozone in contact with the wastewater. Several microbubbles have a larger surface area than one large bubble of the same volume, and a higher surface area is conducive to greater solubility.

[0022] When the pressurized wastewater enters the ozone microbubble injector inlet, it is compressed toward the injection chamber and becomes a high-speed jet. The increase in velocity through the injection chamber causes a decrease in absolute pressure, which creates a vacuum, sucking ozone through the suction port and thoroughly mixing it into the water flow. As the jet diffuses toward the ejector outlet, its velocity decreases and it resumes its flow in a fully mixed state with slightly lower energy than when it entered the ejector.

[0023] The second aspect of the present invention provides an ozone catalytic oxidation method for deep treatment of wastewater, comprising the steps of: continuously passing wastewater into a reaction tank body from the bottom, discharging water from the top, and controlling the hydraulic retention time to be 2 to 4 hours; during operation, regularly passing hydrogen peroxide to control the H2O2 concentration in the reaction tank body to be 0.05 to 0.15 ml / L, the ozone concentration and the target COD removal ratio OC ratio are controlled at 1.5 to 3, the pH is 7 to 9, and the temperature is 25°C.

[0024] The third aspect of the present invention provides a treatment system, comprising a wastewater sedimentation device, a filtering device and the ozone catalytic oxidation device for deep treatment of wastewater according to the first aspect.

[0025] 3. Beneficial effects

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] (1) The ozone catalytic oxidation device for deep treatment of wastewater of the present invention can not only efficiently excite ozone and hydrogen peroxide to produce hydroxyl radicals, but also overcome the defects of the traditional single ozone oxidation process such as low oxygen dissolution efficiency, low ozone utilization rate, and low production of hydroxyl radicals, but also overcome the defects of the traditional Fenton oxidation process such as more by-product sludge, high cost, and complex operating conditions;

[0028] (2) The ozone catalytic oxidation device for deep treatment of wastewater of the present invention can achieve efficient removal of COD and residual pollutants for pharmaceutical wastewater, etc.;

[0029] (3) Compared with the traditional homogeneous Fenton reaction system, the ozone catalytic oxidation device for deep treatment of wastewater of the present invention relies on the efficient excitation of ozone and hydrogen peroxide to produce hydroxyl radicals during the catalytic oxidation process, and does not add ferrous reagents. Therefore, no iron sludge is produced during the process, which can reduce the amount of hazardous waste generated.

[0030] (4) The two or more ozone microbubble projectors provided in the present invention spray high-speed flowing wastewater to collide with each other at an angle of 45° upward. These wastewater collisions can generate strong turbulence and shear force. At the same time, cavitation occurs again inside or around the cavitation bubbles that have been formed, thereby improving the ozone dissolving efficiency of the process. The system has a high efficiency in catalyzing the production of ·OH and produces a secondary cavitation effect, which can achieve efficient removal of trace pollutants in the wastewater. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments, but it should be understood that these drawings are designed only for explanation purposes and are not intended to limit the scope of the present invention. In addition, unless otherwise specified, these drawings are intended only to conceptually illustrate the structural configurations described herein and are not necessarily drawn to scale.

[0032] Figure 1 It is a schematic structural diagram of the ozone oxidation wastewater treatment device based on the polymerization path of the present invention;

[0033] Figure 2 This is a schematic diagram of the structure of an ozone microbubble projector;

[0034] Figure 3 for Figure 1 A magnified view of part A;

[0035] Figure 4 This is a schematic diagram of the distribution structure of the ozone microbubble projector;

[0036] Description of reference numerals:

[0037] 10. Reaction tank; 11. Circulating water outlet; 12. Circulating water inlet; 13. Wastewater outlet; 14. Wastewater inlet; 15. Bottom plate; 16. Sight glass; 17. Ozone tail gas discharge port;

[0038] 20. Hydrogen peroxide input assembly; 21. Water inlet pipe; 22. Water inlet pump; 23. Hydrogen peroxide pipe; 24. Hydrogen peroxide dosing pump; 25. Hydrogen peroxide mixer;

[0039] 30. Circulating wastewater ozone projection assembly; 31. Ozone microbubble projector; 311. Baffle plate; 312. Cutting filler; 32. Circulating pump; 33. Circulating pipeline; 34. Ozone generator; 35. Ozone inlet pipe. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0041] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0043] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0044] In addition, the terms "horizontal" and "vertical" do not mean that the components must be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0045] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] The wastewater treatment system of the present invention comprises a wastewater sedimentation device, a filtering device and an ozone catalytic oxidation device for deep treatment of wastewater.

[0047] like Figures 1 to 4 As shown, the ozone catalytic oxidation device for deep treatment of wastewater in this embodiment includes a reaction tank body 10, a hydrogen peroxide input component 20 and a circulating wastewater ozone projection component 30.

[0048] The reaction tank body 10 is provided with a circulating water outlet 11, a circulating water inlet 12, a wastewater outlet 13 and a wastewater inlet 14; the reaction tank body 10 is a cylindrical tank body, and its material is SUS316L or above, the height-to-diameter ratio of the reaction tank body 10 is 2:1-4:1, and the volume is determined by the hydraulic retention time (HRT), and the general hydraulic retention time (HRT) is 2-4 hours; a bottom plate 15 for balancing is arranged under the reaction tank body 10; the reaction tank body 10 is provided with a sight glass 16; and an ozone tail gas discharge port 17 is installed on the top of the reaction tank body 10.

[0049] In this embodiment, the hydrogen peroxide input assembly 20 includes an inlet pipe 21, an inlet pump 22, a hydrogen peroxide pipe 23, a hydrogen peroxide dosing pump 24 and a hydrogen peroxide mixer 25. The hydrogen peroxide mixer 25 is connected in sequence to the inlet pipeline formed by the inlet pipe 21 and the inlet pump 22, and the hydrogen peroxide pipeline formed by the hydrogen peroxide pipe 23 and the hydrogen peroxide dosing pump 24. The hydrogen peroxide mixer 25 is connected to the wastewater inlet 14; wastewater enters from the wastewater inlet 14 through the inlet pipe 21 and the inlet pump 22; hydrogen peroxide is input into the hydrogen peroxide mixer 25 through the hydrogen peroxide pipe 23 and the hydrogen peroxide dosing pump 24, and then enters the reaction tank body 10 after being completely mixed with the wastewater.

[0050] Combination Figure 1As shown, the circulating wastewater ozone projection assembly 30 includes a circulating pipeline 33, a circulating pump 32 and an ozone microbubble projector 31, the ozone microbubble projector 31 is connected to an ozone inlet pipe 35, an ozone generator 34 is installed at the end of the ozone inlet pipe 35, the ozone microbubble projector 31 is installed at an angle of 40-50° a on the bottom of the reaction tank body 10 (specifically, the ozone microbubble projector is tilted upward, and its lowermost end can be fixed at a small height from the lowermost end face of the reaction tank body 10, and then extend upward), the ozone microbubble projector 31 contains a Venturi assembly, one end of the circulating pipeline 33 is connected to the circulating water outlet 11, and the other end is connected to the circulating pump 32, the circulating pump 32 is connected to the circulating water inlet 12 and the ozone microbubble projector 31, so that the circulating water enters the reaction tank body 10 together with the ozone.

[0051] It should be emphasized that if Figure 2 As shown, the ozone microbubble projector 31 contains a Venturi component, and the Venturi component includes a baffle 311 and a cutting filler 312. The circulating wastewater passes through the Venturi component to absorb ozone and become dense bubbles. After passing through the baffle and the cutting filler again, the ozone is transformed into nano-scale tiny bubbles through the ozone microbubble projector 31 through collision and cutting. The bubbles diffuse into each level of reaction zone, penetrate the entire reaction zone, and reach the top of the reaction tank 10 after catalytic oxidation reaction with the wastewater, hydrogen peroxide, and ozone.

[0052] Preferably, Figure 3 and Figure 4 As shown, the ozone microbubble projectors 31 are installed obliquely at an angle of 45° a and are arranged around the bottom of the reaction tank body 10. There are 4 groups of ozone microbubble projectors 31, and the ozone microbubble projectors 31 are all arranged at the bottom of the reaction tank body 10, for example, distributed along the four quadrant boundary points of a circle.

[0053] The device of the present invention continuously introduces wastewater into the reaction tank body from the bottom, and discharges water from the upper part, and the hydraulic retention time is controlled to be 2-4 hours; during operation, hydrogen peroxide is regularly introduced to control the H2O2 concentration in the reaction tank body to be 0.05-0.15 ml / L, the ozone concentration and the target COD removal ratio OC ratio are controlled to be 1.5-3, the pH is 7-9, and the temperature is 25°C.

[0054] Example 1

[0055] Representative pharmaceutical companies in the pharmaceutical park are selected as water-taking companies, and water for pilot research is provided through a model that combines sewage introduction into the park with long-distance transportation and water transfer.

[0056] First, the wastewater is filled with the whole device of the present invention, and hydrogen peroxide is added at a concentration of 0.05 ml / L and mixed into the reaction tank, with a pH of 7 and a temperature of 25°C. The influent COD is about 400 mg / L, and the ozone dosage is controlled to be 200 g / m 3 After 2 hours of reaction, water began to flow in and out continuously, and the residence time was controlled to be 2 hours. The H2O2 concentration in the reaction tank was controlled to be 0.05 ml / L. Hydrogen peroxide and ozone were continuously added. After 1 hour of continuous operation, water samples were taken from the outlet every 0.5 hours for monitoring.

[0057] After statistical calculation, the ozone dosage is 400g / m 3 The COD removal rate of the device is 37.8%. According to the above data, under the above ozone dosage conditions, the device has a good effect in removing pollutants from pharmaceutical wastewater.

[0058] At the same time, it is calculated that the utilization rate of ozone reaches 96%.

[0059] Example 2

[0060] Representative pharmaceutical companies in the pharmaceutical park are selected as water-taking companies, and water for pilot research is provided through a model that combines sewage introduction into the park with long-distance transportation and water transfer.

[0061] First, the wastewater is filled with the whole device of the present invention, and hydrogen peroxide is added at a concentration of 0.1 ml / L and mixed into the reaction tank, with a pH of 7 and a temperature of 25°C. The influent COD is about 400 mg / L, and the ozone dosage is controlled to be 400 g / m 3 After 2 hours of reaction, water began to flow in and out continuously, and the residence time was controlled to be 2 hours. The H2O2 concentration in the reaction tank was controlled to be 0.15 ml / L. Hydrogen peroxide and ozone were continuously added. After 1 hour of continuous operation, water samples were taken from the outlet for monitoring every 0.5 hours.

[0062] After statistical calculation, the ozone dosage is 400g / m 3 The COD removal rate of the device is 54.5%. According to the above data, under the above ozone dosage conditions, the device has a good effect in removing pollutants from pharmaceutical wastewater.

[0063] Example 3

[0064] Representative pharmaceutical companies in the pharmaceutical park are selected as water-taking companies, and water for pilot research is provided through a model that combines sewage introduction into the park with long-distance transportation and water transfer.

[0065] First, fill the whole device with wastewater, and then add hydrogen peroxide at a concentration of 0.15ml / L and mix it into the reaction tank. The pH is 7 and the temperature is 25℃. The influent COD is about 400mg / L, and the ozone dosage is controlled to be 400g / m 3 After 2 hours of reaction, water began to flow in and out continuously, and the residence time was controlled to be 2 hours. The H2O2 concentration in the reaction tank was controlled to be 0.1 ml / L. Hydrogen peroxide and ozone were continuously added. After 1 hour of continuous operation, water samples were taken from the outlet for monitoring every 0.5 hours.

[0066] After statistical calculation, the ozone dosage is 400g / m 3 The COD removal rate of the device is 43.7%. According to the above data, under the above ozone dosage conditions, the device has a good effect in removing pollutants from pharmaceutical wastewater.

[0067] Comparative Example 1

[0068] The ozone microbubble projector 31 of Example 1 was processed without including a venturi component.

[0069] Representative pharmaceutical companies in the pharmaceutical park are selected as water-taking companies, and water for pilot research is provided through a model that combines sewage introduction into the park with long-distance transportation and water transfer.

[0070] First, fill the whole device with wastewater, and then add hydrogen peroxide at a concentration of 0.15ml / L and mix it into the reaction tank. The pH is 7 and the temperature is 25℃. The influent COD is about 400mg / L, and the ozone dosage is controlled to be 400g / m 3 After 2 hours of reaction, water began to flow in and out continuously, and the residence time was controlled to be 2 hours. The H2O2 concentration in the reaction tank was controlled to be 0.05 ml / L. Hydrogen peroxide and ozone were continuously added. After 1 hour of continuous operation, water samples were taken from the outlet every 0.5 hours for monitoring.

[0071] After statistical calculation, the ozone dosage is 400g / m 3 , the COD removal rate of the device is 29.8%. According to the above data, under the above ozone dosage conditions, the device has a good effect in removing pollutants from pharmaceutical wastewater. At the same time, the ozone utilization rate is calculated to be 50.1%.

[0072] By comparing the above data, it can be seen that the device of the present invention can overcome the defects of the traditional single ozone oxidation process such as low dissolved oxygen efficiency, low ozone utilization rate, and less hydroxyl radical production. It also overcomes the defects of the traditional Fenton process such as more by-product sludge, high cost, and complex operating conditions.

[0073] In actual use, the two or more ozone microbubble projectors provided in the present invention spray high-speed flowing wastewater to collide with each other at an angle upward, especially at 45 degrees. In the limited space of the reaction tank body 10, these wastewater collisions can generate strong turbulence and shear force, and cavitation occurs again inside or around the cavitation bubbles that have been formed.

[0074] In addition, to the surprise of the inventors, there are dense ozone bubbles distributed in the wastewater. When the bubbles burst in an environment of high pressure and high-speed flow, extremely high pressure and temperature are generated inside and around the bubbles. These extreme conditions can effectively activate water molecules and decompose them into hydroxyl free radicals. The generated hydroxyl free radicals have extremely strong oxidizing ability and can quickly attack and degrade organic pollutants in the water, converting them into harmless substances such as carbon dioxide and water.

[0075] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An ozone catalytic oxidation device for deep treatment of wastewater, characterized in that: include: A reaction tank body (10) is provided with a circulating water outlet (11), a circulating water inlet (12), a wastewater outlet (13) and a wastewater inlet (14); A hydrogen peroxide input component (20), the hydrogen peroxide input component (20) comprising a water inlet pipe (21), a water inlet pump (22), a hydrogen peroxide pipe (23), a hydrogen peroxide dosing pump (24) and a hydrogen peroxide mixer (25), the hydrogen peroxide mixer (25) being connected in sequence to a water inlet pipeline formed by the water inlet pipe (21) and the water inlet pump (22), and a hydrogen peroxide pipeline formed by the hydrogen peroxide pipe (23) and the hydrogen peroxide dosing pump (24), and the hydrogen peroxide mixer (25) being connected to a wastewater inlet (14); And a circulating wastewater ozone projection component (30), the circulating wastewater ozone projection component (30) comprising a circulating pipeline (33), a circulating pump (32) and an ozone microbubble projector (31), the ozone microbubble projector (31) being installed obliquely at an angle of 40-50° on the bottom of the reaction tank body (10), the ozone microbubble projector (31) containing a Venturi component, one end of the circulating pipeline (33) being connected to the circulating water outlet (11), and the other end being connected to the circulating pump (32), the circulating pump (32) being connected to the circulating water inlet (12) and the ozone microbubble projector (31), so that circulating water and ozone enter the reaction tank body (10).

2. The ozone catalytic oxidation device for deep treatment of wastewater according to claim 1 is characterized in that: The ozone microbubble projectors (31) are installed upward at an angle of 45° and are arranged around the bottom of the reaction tank (10). There are four groups of ozone microbubble projectors.

3. The ozone catalytic oxidation device for deep treatment of wastewater according to claim 2 is characterized in that: The ozone microbubble projectors (31) are all arranged at the bottom of the reaction tank body (10).

4. The ozone catalytic oxidation device for deep treatment of wastewater according to any one of claims 1 to 3, characterized in that: The reaction tank body (10) is a cylindrical tank body, and its material is SUS316L or above, and the height-to-diameter ratio of the reaction tank body (10) is 2:1 to 4:

1.

5. The ozone catalytic oxidation device for deep treatment of wastewater according to claim 4 is characterized in that: A bottom plate (15) for balancing is arranged below the reaction tank body (10).

6. The ozone catalytic oxidation device for deep treatment of wastewater according to claim 5, characterized in that: The reaction tank body (10) is provided with a sight glass (16).

7. The ozone catalytic oxidation device for deep treatment of wastewater according to claim 6, characterized in that: An ozone tail gas discharge port (17) is installed on the top of the reaction tank body (10).

8. The ozone catalytic oxidation device for deep treatment of wastewater according to claim 7, characterized in that: The ozone microbubble projector (31) is connected to an ozone air inlet pipe (35), and an ozone generator (34) is connected to the end of the ozone air inlet pipe (35).

9. A method, using the ozone catalytic oxidation device for deep treatment of wastewater according to any one of claims 1 to 8, characterized in that: The method comprises the following steps: continuously introducing wastewater into a reaction tank body from the bottom, discharging water from the top, and controlling the hydraulic retention time to be 2 to 4 hours; during operation, regularly introducing hydrogen peroxide to control the H2O2 concentration in the reaction tank body to be 0.05 to 0.15 ml / L, the ozone concentration and the target COD removal ratio OC ratio to be 1.5 to 3, the pH to be 7 to 9, and the temperature to be 25°C.

10. A treatment system comprising a wastewater sedimentation device and a filtering device, characterized in that: It also includes an ozone catalytic oxidation device for deep treatment of wastewater as described in any one of claims 1-8.

Images