Micro-bubble enhanced ozone catalytic oxidation wastewater treatment device

Abstract

The application discloses a kind of microbubble reinforced ozone catalytic oxidation sewage treatment devices, including reactor body, mixer, overflow pipe, catalyst layer, reactor body top is provided with rotating shaft, rotating shaft one end is connected with motor, the other end is connected with rotating cylinder, rotating cylinder bottom is connected with connecting shaft, connecting shaft both sides are provided with rotating rod, and cutting blade is arranged on rotating rod;The inside of reactor body is provided with baffle, and aerator is arranged on baffle;Air inlet, air outlet are opened on the side wall of reactor body;Water inlet, water outlet are opened on the side wall of reactor body, water inlet pipe passes through water inlet and extends into rotating cylinder, and the side wall of water inlet pipe inside rotating cylinder is provided with first small hole and water inlet pipe top end is closed;Mixer is located below baffle and above catalyst layer;Overflow pipe one end is located above baffle, and the other end passes through baffle and is communicated with mixer;The device solves the problem of low efficiency and high energy consumption of existing ozone sewage treatment equipment.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment, specifically to a microbubble-enhanced ozone wastewater treatment device. Background Technology

[0002] After traditional physicochemical or biochemical treatment, most of the easily degradable and removable pollutants in industrial wastewater have been removed. However, the remaining pollutants, although at low concentrations, are difficult to treat. In many cases, industrial wastewater requires tertiary advanced treatment to meet the requirements of water pollution control and wastewater reuse. Ozone wastewater treatment, as an effective advanced wastewater treatment method, has gained attention due to its advantages, including strong oxidation capacity, fast reaction speed, ease of use (including ozone generation, output, and dosing), and lack of secondary pollution.

[0003] Ozone is chemically reactive and possesses strong oxidizing properties. It is a good oxidant for most organic compounds, especially those containing unsaturated bonds and chromophores. However, ozone has a low solubility in water (only 0.69 g / L) and rapidly decomposes into oxygen in aqueous solutions, with a half-life of 5–30 minutes. The direct oxidation reaction of ozone with organic compounds is highly selective, producing mostly aldehydes and carboxylic acids, which cannot be completely mineralized. The oxidation reaction caused by ozone in aqueous solutions is very complex; only a portion of the ozone molecules react directly with the dissolved substances, while the rest decomposes before the reaction. The indirect oxidation reaction of ozone with organic compounds refers to the initial formation of ·OH and O2· by ozone molecules. - Free radicals such as ·OH and ·OH can trigger chain reactions. ·OH is generally considered the main free radical species in indirect reactions. ·OH has strong oxidizing properties and electrophilicity, and can almost completely oxidize most organic compounds without selectivity.

[0004] Chinese patent document CN208120782U discloses an ozone-based wastewater purification device, including a base and a body. The body is fixedly connected to the upper surface of the base via support legs. A storage slot is located on the right side of the base's interior. A drive motor is installed inside the storage slot, and the output shaft of the drive motor extends out of the storage slot and to the outside of the base. A rotating shaft is inserted into the middle of the lower surface of the body, and the bottom end of the rotating shaft is fixedly connected to the inner ring of a bearing installed in the middle of the upper surface of the base. This ozone-based wastewater purification device, by incorporating a drive motor, a stirring shaft, a stirring paddle, and an ozone generator, uses the drive motor to rotate the stirring shaft, stirring the wastewater during the ozone purification process. This accelerates the more comprehensive contact and fusion of ozone and wastewater, improving the purification efficiency of ozone. Combined with an ultraviolet irradiation lamp, it achieves a highly efficient purification effect. However, this device suffers from drawbacks such as poor ozone mass transfer efficiency, low ozone utilization rate, and high energy consumption. Summary of the Invention

[0005] In order to overcome the shortcomings of the existing technology, the purpose of this invention is to provide a microbubble enhanced ozone catalytic oxidation wastewater treatment device, which solves the problems of low efficiency and high energy consumption of existing ozone oxidation wastewater treatment equipment.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A microbubble-enhanced ozone catalytic oxidation wastewater treatment device includes a reactor body, an inlet pipe, and an overflow pipe. A rotating shaft is centrally located at the top of the reactor body. One end of the rotating shaft is connected to a motor, and the other end, located inside the reactor body, is connected to a rotating cylinder. A connecting shaft is connected to the bottom of the rotating cylinder. Rotating rods with cutting blades are arranged on both sides of the connecting shaft. A baffle plate is installed inside the reactor body, located below the connecting shaft, and several aerators are arranged on the baffle plate. An air inlet and an air outlet are provided on the side wall of the reactor body. The reactor body has an air inlet and an air outlet located below the partition plate; a water inlet and a water outlet are provided on the side wall of the reactor body, both located below the partition plate; a water inlet pipe extends through the water inlet into the rotating cylinder, and a first small hole is provided on the side wall of the water inlet pipe inside the rotating cylinder, with the top of the water inlet pipe inside the rotating cylinder being closed; a catalyst layer is provided at the bottom of the reactor body, and a mixer is provided inside the reactor body, located below the partition plate and above the catalyst layer; one end of the overflow pipe is located above the partition plate, and the other end passes through the partition plate and communicates with the mixer.

[0008] Preferably, the connecting shaft is further provided with stirring blades, which are located below the rotating rod.

[0009] Preferably, both the rotating cylinder and the connecting shaft are hollow structures.

[0010] Preferably, the air inlet is connected to each of the aerators via a pipe.

[0011] Preferably, the mixer is provided with a gas inlet, and the top of the reactor body is provided with a gas outlet, which is connected to the gas inlet via a pipe.

[0012] Preferably, the catalyst layer is divided into a first reaction zone and a second reaction zone by a vertical baffle, and the bottom of the first reaction zone and the second reaction zone are connected.

[0013] Preferably, the mixer is provided with a mixing outlet, which is located above the first reaction zone.

[0014] Preferably, a second small hole is provided on the inner wall of the rotating cylinder, and a third small hole is provided on the outer side and bottom side of the rotating cylinder, and the rotating cylinder is filled with wire mesh filler.

[0015] Preferably, an observation port is provided at the top of the reactor body, and a drain port is provided at the bottom of the reactor body.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1) The microbubble-enhanced ozone catalytic oxidation wastewater treatment device provided by the present invention can reduce the ozone demand during wastewater treatment, save ozone resources, and generate ozone microbubbles by aerators, stirring blades and mixers, increasing the total surface area of ​​the bubbles, making the contact between ozone and wastewater more complete, increasing the efficiency of ozone treatment of wastewater, and also reducing the energy consumption of wastewater treatment.

[0018] 2) This invention provides a rotating cylinder, which, through the action of the rotating cylinder and the aerator, enables wastewater and ozone to produce cross-flow gas-liquid contact, thereby improving the efficiency of ozone in treating wastewater. At the same time, it can also reduce the resistance drop of ozone gas and expand the application range of ozone.

[0019] 3) By setting up stirring blades and cutting blades, the ozone gas in the sewage is cut into microbubbles through high-speed rotation and cutting. Microbubbles have high gas-liquid mass transfer efficiency and have contraction and rupture characteristics in the liquid phase, which can promote the generation of hydroxyl radicals, thereby greatly improving the ozone utilization rate and ozone treatment effect.

[0020] 4) By setting a catalyst layer, the present invention can further promote the generation of hydroxyl radicals in the microbubble ozone oxidation system, enhance ozone mass transfer, improve ozone utilization, enhance ozone oxidation capacity, and significantly improve ozone oxidation effect and ozone utilization. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some schematic diagrams of certain embodiments of the present invention, and therefore should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 A schematic diagram of the microbubble-enhanced ozone catalytic oxidation wastewater treatment device provided by the present invention;

[0023] Figure 2 This is a vertical sectional view of the rotating cylinder and the connecting shaft;

[0024] Figure 3This is a schematic diagram of the stirring blades.

[0025] In the diagram, 1. Reactor body; 2. Rotating shaft; 3. Rotating cylinder; 301. Second small hole; 302. Third small hole; 303. Wire mesh packing; 4. Connecting shaft; 5. Rotating rod; 6. Stirring blades; 7. Cutting blades; 8. Baffle plate; 9. Aerator; 10. Air inlet; 11. Air outlet; 12. Water inlet; 1201. Water inlet pipe; 1202. First small hole; 13. Water outlet; 14. Mixer; 1401. Inlet for guiding air; 1402. Mixed flow outlet; 1403. Air inlet; 15. Overflow pipe; 16. Catalyst layer; 1601. First reaction zone; 1602. Second reaction zone; 17. Observation port; 18. Sewage outlet. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. Of course, the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0027] The terms "first," "second," etc., are used only for descriptive distinction and should not be interpreted as indicating or implying relative importance. Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," not that the structure must be perfectly horizontal, but can be slightly tilted.

[0028] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0029] like Figure 1As shown, this invention provides a microbubble-enhanced ozone catalytic oxidation of wastewater, comprising a reactor body 1, an inlet pipe 1201, and an overflow pipe 15. A rotating shaft 2 is centrally located at the top of the reactor body 1. One end of the rotating shaft 2 is connected to a motor, and the other end, located inside the reactor body 1, is connected to a rotating cylinder 3. A connecting shaft 4 is connected to the bottom of the rotating cylinder 3. Rotating rods 5 are arranged on both sides of the connecting shaft 4, and cutting blades 7 are mounted on the rotating rods 5. A partition 8 is provided inside the reactor body 1, located below the connecting shaft 4, and several aerators 9 are mounted on the partition 8. An air inlet 10 and an air outlet 11 are provided on the side wall of the reactor body 1. The air outlets 11 are all located below the partition plate 8; the reactor body 1 has an inlet 12 and an outlet 13 on its side wall, both of which are located below the partition plate 8; the inlet pipe 1201 passes through the inlet 12 and extends into the rotating cylinder 3, and the side wall of the inlet pipe 1201 inside the rotating cylinder 3 has a first small hole 1202, and the top of the inlet pipe 1201 inside the rotating cylinder 3 is closed; a catalyst layer 16 is provided at the bottom of the reactor body 1, and a mixer 14 is provided inside the reactor body 1, which is located below the partition plate 8 and above the catalyst layer 16; one end of the overflow pipe 15 is located above the partition plate 8, and the other end passes through the partition plate 8 and communicates with the mixer 14.

[0030] Specifically, the connecting shaft 4 is also provided with stirring blades 6, which are located below the rotating rod 5.

[0031] Specifically, both the rotating cylinder 3 and the connecting shaft 4 are hollow structures.

[0032] Specifically, the air inlet 10 is connected to each of the aerators 9 via a pipe.

[0033] Specifically, the mixer 14 is provided with a gas inlet 1401, and the top of the reactor body 1 is provided with a gas outlet 1403. The gas outlet 1403 and the gas inlet 1401 are connected by a pipe.

[0034] Specifically, the catalyst layer 16 is divided into a first reaction zone 1601 and a second reaction zone 1602 by a vertical baffle, and the bottom of the first reaction zone 1601 and the second reaction zone 1602 are connected.

[0035] Specifically, the mixer 14 is provided with a mixing outlet 1402, which is located above the first reaction zone 1601.

[0036] Specifically, a second small hole 301 is provided on the inner wall of the rotating cylinder 3, and a third small hole 302 is provided on the outer side and bottom side of the rotating cylinder 3. The rotating cylinder 3 is filled with wire mesh filler 303.

[0037] Specifically, an observation port 17 is provided at the top of the reactor body 1, and a drain port 18 is provided at the bottom of the reactor body 1.

[0038] Specifically, the catalyst filled in the catalyst layer 16 is a carbon-based catalyst supported on an active metal component.

[0039] The present invention will be further described below through specific embodiments.

[0040] Example 1

[0041] A microbubble-enhanced ozone catalytic oxidation of wastewater includes a reactor body 1, an inlet pipe 1201, and an overflow pipe 15. A rotating shaft 2 is centrally located at the top of the reactor body 1. One end of the rotating shaft 2 is connected to a motor, and the other end, located inside the reactor body 1, is connected to a rotating cylinder 3. A connecting shaft 4 is connected to the bottom of the rotating cylinder 3. Rotating rods 5 are arranged on both sides of the connecting shaft 4, and cutting blades 7 are mounted on the rotating rods 5. A partition 8 is installed inside the reactor body 1, located below the connecting shaft 4, and several aerators 9 are mounted on the partition 8. An air inlet 10 and an air outlet 11 are provided on the side wall of the reactor body 1. All components are located below the partition plate 8; the reactor body 1 has an inlet 12 and an outlet 13 on its side wall, both located below the partition plate 8; the inlet pipe 1201 extends through the inlet 12 into the rotating cylinder 3, and the side wall of the inlet pipe 1201 inside the rotating cylinder 3 has a first small hole 1202, and the top of the inlet pipe 1201 inside the rotating cylinder 3 is closed; a catalyst layer 16 is provided at the bottom of the reactor body 1, and a mixer 14 is provided inside the reactor body 1, located below the partition plate 8 and above the catalyst layer 16; one end of the overflow pipe 15 is located above the partition plate 8, and the other end passes through the partition plate 8 and connects to the mixer 14.

[0042] Specifically, the connecting shaft 4 is also provided with stirring blades 6, which are located below the rotating rod 5.

[0043] Specifically, both the rotating cylinder 3 and the connecting shaft 4 are hollow structures.

[0044] Specifically, the air inlet 10 is connected to each of the aerators 9 via a pipe.

[0045] Specifically, the mixer 14 is provided with a gas inlet 1401, and the top of the reactor body 1 is provided with a gas outlet 1403. The gas outlet 1403 and the gas inlet 1401 are connected by a pipe.

[0046] Specifically, the catalyst layer 16 is divided into a first reaction zone 1601 and a second reaction zone 1602 by a vertical baffle, and the bottom of the first reaction zone 1601 and the second reaction zone 1602 are connected.

[0047] Specifically, the mixer 14 is provided with a mixing outlet 1402, which is located above the first reaction zone 1601.

[0048] Specifically, a second small hole 301 is provided on the inner wall of the rotating cylinder 3, and a third small hole 302 is provided on the outer side and bottom side of the rotating cylinder 3. The rotating cylinder 3 is filled with wire mesh filler 303.

[0049] Specifically, an observation port 17 is provided at the top of the reactor body 1, and a drain port 18 is provided at the bottom of the reactor body 1.

[0050] Specifically, the catalyst filled in the catalyst layer 16 is a carbon-based catalyst supported on an active metal component.

[0051] Application Example 1

[0052] The equipment shown in Example 1 was used to treat the effluent from the settling tank after biochemical treatment at a chemical plant. The designed hydraulic retention time was 40 min. The continuous influent flow rate was 80 L / h, the influent CODcr was 100–120 mg / L, B / C < 0.1, pH was 7.5–9.5, the total air intake was 25 L / h, the ozone concentration was 60 mg / L, and a columnar carbon-based catalyst was used. After treatment, the effluent CODcr was 30–40 mg / L, the average COD removal rate was 72%, and the ozone concentration was 0.5 mg COD / mg O3. The operating energy consumption was approximately 0.1 kW·h / m³. 3 .

[0053] Working principle: The wastewater treatment process of this invention is that wastewater enters the rotating cylinder 3 through the inlet 12 and the inlet pipe 1201. Through the small holes on the rotating cylinder 3, the wastewater leaves the rotating cylinder 3 in the form of droplets under the dual shearing action of the centrifugal force of high speed rotation and the wire mesh packing 303 filled in the rotating cylinder 3 and enters the reactor body.

[0054] The ozone gas released by the aerator 9 reacts with the sewage in the sewage. The rotating rod 5 drives the cutting blade 7 and the connecting shaft 4 drives the stirring blade 6 to generate microbubbles. Microbubbles have the characteristics of contraction and rupture in the liquid phase, which can promote the generation of hydroxyl radicals. Microbubbles can also improve the gas-liquid mass transfer efficiency between ozone and sewage, and promote the treatment effect of ozone on sewage.

[0055] After the ozone gas escapes from the sewage, it reacts with the sewage droplets generated from the rotating drum 3 in a countercurrent as it rises, further improving the efficiency of ozone treatment of sewage. Excess ozone gas is discharged from the air inlet 1403 at the top of the reactor and introduced into the mixer 14 through the pipeline.

[0056] After being fully oxidized by ozone, the wastewater enters the mixer 14 from the overflow pipe 15. In the mixer 14, it is fully mixed with the ozone gas discharged from the air inlet 1403 to form a gas-liquid mixture. Then, it is discharged through the mixing outlet 1402 and enters the first reaction zone 1601. After reacting with the ozone catalyst in the first reaction zone 1601, it enters the second reaction zone 1602 from the bottom of the catalyst layer 16. After being catalytically oxidized by ozone, the wastewater is discharged from the outlet 13 at the top of the second reaction zone 1602, and the gas after the reaction is discharged from the gas outlet 11.

[0057] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A microbubble-enhanced ozone catalytic oxidation wastewater treatment device, characterized in that, The utility model provides a reactor, including reactor body (1), water inlet pipe (1201), overflow pipe (15), the top central through -going of reactor body (1) is provided with rotating shaft (2), one end of rotating shaft (2) is connected with motor, the other end of rotating shaft (2) is connected with rotating cylinder (3) in reactor body (1) inside, the bottom of rotating cylinder (3) is connected with connecting shaft (4), both sides of connecting shaft (4) are provided with rotating rod (5), and the cutting blade (7) is provided on rotating rod (5);The inside of reactor body (1) is provided with baffle (8), baffle (8) is located below connecting shaft (4), and a plurality of aerators (9) are arranged on baffle (8);Air inlet (10), air outlet (11) are formed in the side wall of reactor body (1), and air inlet (10), air outlet (11) are all located below baffle (8);Water inlet (12), water outlet (13) are formed in the side wall of reactor body (1), and water inlet (12), water outlet (13) are all located below baffle (8);Water inlet pipe (1201) passes through water inlet (12) and extends into rotating cylinder (3), and first small hole (1202) is formed in the side wall of water inlet pipe (1201) in rotating cylinder (3), and the top of water inlet pipe (1201) in rotating cylinder (3) is closed;Catalyst layer (16) is arranged on the bottom of reactor body (1), and mixer (14) is arranged in the inside of reactor body (1), and mixer (14) is located below baffle (8) and above catalyst layer (16);One end of overflow pipe (15) is located above baffle (8), and the other end of overflow pipe (15) is communicated with mixer (14) after passing through baffle (8); Stirring blade (6) is further arranged on connecting shaft (4), and stirring blade (6) is located below rotating rod (5); Rotating cylinder (3) and connecting shaft (4) are all hollow structures; Air inlet (10) is communicated with each aerator (9) by pipeline.

2. The apparatus of claim 1, wherein, Air inlet (1403) is communicated with air inlet (1401) by pipeline.

3. The apparatus of claim 2, wherein, Catalyst layer (16) is divided into first reaction zone (1601) and second reaction zone (1602) by vertical baffle, and the bottom of first reaction zone (1601) and second reaction zone (1602) is communicated.

4. The apparatus of claim 1, wherein, Mixing outlet (1402) is arranged on mixer (14), and mixing outlet (1402) is located above first reaction zone (1601).

5. The apparatus of claim 4, wherein, Second small hole (301) is formed in the inner wall of rotating cylinder (3), third small hole (302) is formed in the outer side and bottom side of rotating cylinder (3), and silk screen filler (303) is filled in rotating cylinder (3).

6. The apparatus of claim 1, wherein, Observation port (17) is arranged on the top of reactor body (1), and blowdown port (18) is arranged on the bottom of reactor body (1).

7. The apparatus of claim 1, wherein, ​

Images