Ozone reactor for industrial wastewater treatment and use method thereof

Abstract

The invention relates to an ozone reactor for industrial wastewater treatment and a use method thereof.The ozone reactor comprises an inner cylinder and an outer cylinder, a water inlet pipe is arranged at the top of the inner cylinder, a first aeration device is arranged at the bottom of the inner cylinder, and a first reaction area is formed in an inner cylinder cavity between the water inlet pipe and the first aeration device; a plurality of retention plates which are vertically arranged at intervals are fixedly arranged in the first reaction zone, one end of each retention plate is hermetically and fixedly connected with the side wall of the inner cylinder, the other end of each retention plate is inclined downwards, and a retention zone is formed below each retention plate. A double-reaction-zone structure of the first reaction zone and the second reaction zone is formed, so that the ozone utilization rate is increased; a plurality of retention plates are arranged in the first reaction region, so that the sewage flow is prolonged, ozone retention regions are formed at the bottoms of the retention plates, the contact between ozone and sewage is enhanced, and the ozone utilization rate is further improved; a liquid level and exhaust electromagnetic valve linkage control mode is adopted, so that micro-positive pressure operation of the reactor is ensured, the gas-liquid interface mass transfer efficiency is improved, and the ozone reaction efficiency is improved.

Description

An ozone reactor for industrial wastewater treatment and its application method Technical Field

[0001] This invention relates to the field of industrial wastewater treatment technology, and more particularly to the field of ozone reactors, specifically to an ozone reactor for industrial wastewater treatment and its usage method. Background Technology

[0002] Dyeing and printing wastewater mainly comes from processes such as boiling, bleaching, desizing, dyeing, printing and finishing of yarn or fabric. It contains chemical substances such as dyes, sizing agents and auxiliaries, and is characterized by large water volume, high content of organic pollutants and complex composition.

[0003] In recent years, with the national requirements for energy conservation and emission reduction, membrane separation technology has been widely used for the reuse treatment of dyeing and printing wastewater. However, nanofiltration membranes and reverse osmosis membranes also produce post-membrane concentrate when reusing wastewater. The membrane concentrate has high COD, color, and total salt content, and poor biodegradability. It is difficult to meet the discharge requirements by using conventional coagulation and biological treatment methods.

[0004] Ozone catalytic oxidation is a commonly used treatment method for difficult-to-treat high-salt and recalcitrant industrial organic wastewater, offering advantages such as wide applicability, simple process, and no secondary pollution. During treatment, factors such as the contact efficiency between ozone and the medium, and the reaction residence time, directly determine the treatment effect of the ozone reactor. However, in practical use, existing ozone reactors often exhibit low ozone utilization rates and unstable treatment effects, necessitating a device to improve ozone utilization and address this issue. Summary of the Invention

[0005] This invention addresses the shortcomings of existing technologies by providing an ozone reactor for industrial wastewater treatment and its application method. Through improvements to the ozone reactor, the utilization rate of ozone is significantly increased.

[0006] This invention is achieved through the following technical solution: providing an ozone reactor for industrial wastewater treatment, comprising an inner cylinder, an inlet pipe at the top of the inner cylinder, and a first aeration device at the bottom of the inner cylinder. The inner cylinder cavity between the inlet pipe and the first aeration device forms a first reaction zone. A plurality of retention plates arranged vertically at intervals are fixedly disposed in the first reaction zone. One end of each retention plate is sealed and fixed to the side wall of the inner cylinder, and the other end of the retention plate is inclined downward. A retention zone is formed below each retention plate.

[0007] In this system, wastewater flows from top to bottom while ozone flows from bottom to top, achieving countercurrent contact between ozone and wastewater and improving reaction efficiency. By setting up a retention plate, the contact time between wastewater and ozone is increased, and an ozone retention zone is formed at the bottom of the retention plate, further improving ozone utilization.

[0008] As an optimization, the vertical projections of two adjacent retention plates overlap, forming an S-shaped gas channel. This optimized retention plate configuration allows ozone to flow upwards in an S-shape, further extending the contact time between ozone and wastewater, thereby further improving ozone utilization.

[0009] As an optimization, an outer cylinder is also included, with the inner cylinder located inside the outer cylinder. A second reaction zone is formed between the inner and outer cylinders. The bottom of the inner cylinder has a through hole connecting the first and second reaction zones, and a second aeration device is provided at the bottom of the second reaction zone. This optimized solution, by setting up an outer cylinder to form a second reaction zone, allows wastewater and ozone to contact in the first and second reaction zones respectively, improving wastewater treatment efficiency. Furthermore, in the second reaction zone, the ozone flowing out through the second aeration device contacts the wastewater from bottom to top, resulting in more thorough treatment.

[0010] As an optimization, a circulation system is also included, comprising a circulation pipeline equipped with a return water pump. One end of the circulation pipeline connects to the second reaction zone, and the other end extends to the top of the first reaction zone. This optimized solution improves the treatment efficiency by setting up a circulation system that allows some wastewater from the second reaction zone to re-enter the first reaction zone.

[0011] As an optimization, the system also includes a first and second air inlet pipe arranged vertically, and an inclined pipe extending downwards from the lower end of the second air inlet pipe. The upper ends of the first and second air inlet pipes are connected via a first air inlet bend, and the lower end of the inclined pipe is connected to a main air pipe via the second air inlet bend. The end of the main air pipe furthest from the second bend is connected via branch pipes to the air inlets of the first and second aeration devices, respectively. This optimized ozone supply device, by setting the first air inlet bend at the highest point and the second air inlet bend before entering the aeration device, can buffer the pressure shock caused by ozone start-up / stop or pressure changes, ensuring safe operation.

[0012] As an optimization, the upper end of the outer cylinder is fixedly connected to a circumferentially closed water outlet trough. The water outlet trough includes an annular bottom plate sealed and fixedly connected to the upper end of the outer cylinder, a first water-blocking plate extending upward from the annular bottom plate, and a third water-blocking plate extending upward from the annular bottom plate and located outside the first water-blocking plate. An overflow area is formed above the first water-blocking plate, connecting the inner cavity of the water outlet trough with the second reaction zone. A second water-blocking plate is fixedly installed inside the water outlet trough, located between the first and third water-blocking plates. A flow passage area is formed between the lower end of the second water-blocking plate and the annular bottom plate. The upper end of the second water-blocking plate is higher than the upper end of the first water-blocking plate. A water collection trough lower than the upper edge of the first water-blocking plate and higher than the flow passage area is fixedly connected to the inner side wall of the third water-blocking plate. A water outlet pipe communicating with the water collection trough is provided on the side wall of the third water-blocking plate. This optimized design allows the wastewater in the second reaction zone to be discharged sequentially through an upward, downward, upward, and downward flow process, which helps to extend the flow path of the wastewater and improve the reaction efficiency.

[0013] As an optimization, a top cover is sealed and fixed to the upper end of the third partition. A gas-liquid separator is fixed between the top cover and the outer wall of the inner cylinder, located above the second reaction zone and the water outlet tank. An air passage chamber is formed above the gas-liquid separator, and an air passage slit connecting the air passage chamber and the first reaction zone is formed between the upper end of the inner cylinder and the top cover. This optimized solution, by setting a top cover, makes the reactor a closed space, which facilitates maintaining a slightly positive pressure state inside the reactor, allowing for more complete gas-water reactions at the water-gas interface.

[0014] As an optimization, a water distribution ring pipe is fixedly connected to the lower end of the inlet pipe. Several water distribution heads, arranged circumferentially at intervals, are fixedly connected to the bottom surface of the water distribution ring pipe. The upper end of the inner cylinder has a water distribution flare that is larger at the top and smaller at the bottom, with the inner diameter of the flare being larger than the outer diameter of the water distribution ring pipe. This optimized scheme, by setting up the water distribution ring pipe and water distribution heads, facilitates increasing the contact area between wastewater and ozone gas. The water distribution flare also facilitates increasing the area of ​​the water distribution ring pipe, ensuring a larger water distribution area.

[0015] As an optimization, an exhaust solenoid valve is installed on the top cover, and a level gauge electrically connected to the exhaust solenoid valve is installed on the side wall of the outlet tank. This optimized design facilitates maintaining the liquid level in the reactor and prevents excessive internal pressure from affecting the normal operation of the system.

[0016] This solution also provides a method for using an ozone reactor for industrial wastewater treatment, including the following aspects: a) The wastewater to be treated is injected into the inner cylinder through the inlet pipe and flows from top to bottom within the inner cylinder. Ozone enters the inner cylinder through the first aeration device and flows from bottom to top. The ozone comes into contact with the wastewater in the first reaction zone and reacts; b) As the ozone rises, a retention plate blocks some of the ozone bubbles, causing them to remain in the retention zone. As the number of ozone bubbles in the retention zone increases, they move out of the retention zone from the lower edge of the retention plate and continue to move upward into the next retention zone; c) From the first reaction zone... The wastewater flowing down enters the second reaction zone through the bottom of the inner cylinder and flows upward simultaneously with the ozone introduced through the second aeration device, reacting with the ozone in the second reaction zone; d. The wastewater in the second reaction zone enters the effluent tank through the overflow zone, flows upward after passing through the flow zone, then enters the collection tank, and flows out through the effluent pipe; e. As the wastewater treatment proceeds, gas accumulates at the top of the reactor, and the system maintains a slightly positive pressure. As the pressure continuously increases, it continuously lowers the effluent level. When the liquid level is lower than 1 / 2 the height difference between the first baffle plate above the collection tank and the collection tank, the exhaust solenoid valve opens to release gas.

[0017] The beneficial effects of this invention are as follows: by setting an inner cylinder and an outer cylinder, a dual reaction zone structure of a first reaction zone and a second reaction zone is formed, which improves the ozone utilization rate; by setting several retention plates in the first reaction zone, not only is the sewage flow extended, but an ozone retention zone is also formed at the bottom of the retention plates, which enhances the contact between ozone and sewage and further improves the ozone utilization rate; by adopting a control method that links the liquid level and the exhaust solenoid valve, the reactor is guaranteed to operate under slight positive pressure, which improves the gas-liquid interface mass transfer efficiency and improves the ozone reaction efficiency. Attached Figure Description

[0018] Figure 1 is a schematic diagram of the structure of the present invention; Figure 2 is a partial enlarged view of Figure 1; Figure 3 is a top view of the first aeration device; In the figures: 1. Tank, 2. Water distribution area, 3. First reaction zone, 4. Aeration zone, 5. Second reaction zone, 6. Water outlet tank, 7. Water inlet system, 8. Circulation system, 9. Air inlet system, 11. Top cover, 12. Inner cylinder, 13. Outer cylinder, 14. Drain pipe, 15. Exhaust solenoid valve, 16. Manhole, 17. Safety valve, 18. Level gauge, 19. Water outlet pipe, 21. Gas-liquid separator, 22. Water distribution flare, 23. Air passage slit, 31. Retention plate, 32. Retention zone, 41. First aeration device, 42. Second aeration device Aeration device, 61. First baffle plate, 62. Second baffle plate, 63. Annular water collection tank, 71. Inlet pump, 72. First flow meter, 73. Inlet pipe, 81. Return branch pipe, 82. Return inlet pipe I, 83. Return pump, 84. Second flow meter, 85. Return outlet pipe, 86. Return distribution pipe, 87. Water distribution ring pipe, 88. Water distribution head, 91. First air inlet pipe, 92. One-way valve, 93. First air inlet bend, 94. Second air inlet bend pipe, 411. Air inlet radiant pipe, 412. First air inlet ring pipe, 413. First aerator, 414. Aeration head, 421. Second air inlet ring pipe, 422. Second aerator. Detailed Implementation

[0019] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to describe the solution.

[0020] Figure 1 shows an ozone reactor for industrial wastewater treatment, comprising a tank 1, an inlet system 7, a circulation system 8, and an air intake system 9. The tank 1 includes an outer cylinder 13 and an inner cylinder 12 fixed within the outer cylinder. The bottom of the inner cylinder communicates with the outer cylinder, and the ratio of the inner diameter of the outer cylinder to the inner cylinder is 1.2 to 1.5. A drain pipe 14 is provided at the lower end of the outer cylinder sidewall, and a valve is installed on the drain pipe for easy venting. Manholes 16 are provided at the lower end of the outer cylinder sidewall and at the top of the tank for maintenance.

[0021] The inner cylinder has an inlet pipe 73 at the top, and a water distribution zone 2 is formed at the lower end of the inlet pipe. A first aeration device 41 is installed at the bottom of the inner cylinder. The inner cylinder cavity between the inlet pipe and the first aeration device forms a first reaction zone 3. Wastewater to be treated is injected into the inner cylinder through the inlet pipe, and ozone is introduced into the inner cylinder through the first aeration device. In this embodiment, a water distribution ring pipe 87 is fixedly connected to the lower end of the inlet pipe. Several water distribution heads 88 arranged circumferentially are fixedly connected to the bottom surface of the water distribution ring pipe 87. The upper end of the inner cylinder has a water distribution flare 22 that is larger at the top and smaller at the bottom. The inner diameter of the upper end of the water distribution flare is larger than the outer diameter of the water distribution ring pipe. Wastewater entering the water distribution ring pipe through the inlet pipe is sprayed out by each water distribution head, increasing the water distribution area. By setting a water distribution flare in the water distribution zone, and connecting the lower end of the water distribution flare 22 to the inner cylinder 12, it is easy to increase the diameter of the water distribution ring pipe, thereby increasing the water distribution area.

[0022] As shown in Figure 3, the first aeration device 41 includes an air inlet radiant pipe 411, a first air inlet ring pipe 412, and a first aerator 413. The first air inlet ring pipe is located in the inner cylinder and is connected to one end of the air inlet radiant pipe. The other end of the air inlet radiant pipe forms the air inlet for the first and second aeration devices. In this embodiment, the air inlet radiant pipe is a rigid pipe, which facilitates its passage through the side walls of the inner and outer cylinders and is sealed and fixed to the side walls of the inner and outer cylinders. Several first aerators are installed on the top of the first air inlet ring pipe, which are evenly distributed circumferentially to ensure uniform air intake. In this embodiment, the first aerator consists of 6 tubular aeration heads 414. The tubular aeration heads 414 adopt a ceramic membrane microporous structure with a bubble diameter ≤80μm. The ozone introduced into the air intake system passes sequentially through the air inlet radiant pipe, the first air inlet ring pipe, and the first aerator to achieve ozone introduction into the first reaction zone.

[0023] The water inlet system 7 includes the water inlet pipe, and a water inlet pump 71 and a first flow meter 72 installed on the water inlet pipe. Wastewater enters the inner cylinder of the reactor from the top of the reactor through the water inlet pipe 73. The water inlet pump 71 provides the water inlet power, and the first flow meter 72 facilitates the control of the water inlet flow rate.

[0024] Wastewater entering the inner cylinder flows downwards through the first reaction zone 3. Several vertically spaced retention plates 31 are fixed within the first reaction zone 3. One end of each retention plate is sealed to the side wall of the inner cylinder, while the other end slopes downwards. Retention zones 32 are formed below each retention plate. In this embodiment, the angle between the retention plates and the horizontal direction is 2°~3°. The retention plates adopt a large arc-shaped structure, and the vertical projections of two adjacent retention plates 31 overlap, forming an S-shaped gas channel. When ozone rises from the bottom, some bubbles are retained in the retention zone 32. As the number of retained bubbles increases, they continue to move upwards from the edge of the retention plate 31 into the next retention zone. This arrangement increases the gas-water contact time and improves reaction efficiency.

[0025] Within the first reaction zone 3, ozone and wastewater come into countercurrent contact, resulting in a highly efficient reaction. The design of the retention plate 31 extends the contact time between wastewater and ozone, while simultaneously creating an ozone retention zone at the bottom of the plate, further improving ozone utilization. Furthermore, depending on actual treatment needs, packing material or catalysts can be installed within the retention zone to further enhance treatment efficiency.

[0026] A second reaction zone 5 is formed between the inner cylinder and the outer cylinder. The second reaction zone has an annular structure. The bottom of the inner cylinder is provided with a through hole that connects the first reaction zone 3 and the second reaction zone 5. After being treated in the first reaction zone 3, the sewage enters the second reaction zone 5 through the through hole.

[0027] A second aeration device 42 is installed at the bottom of the second reaction zone 5. The second aeration device 42 includes a second air inlet ring pipe 421 connected to the air inlet radiant pipe 411, and several second aerators 422 evenly arranged circumferentially on the top of the second air inlet ring pipe 421. The second aerators 422 are located in the second reaction zone and have the same structure as the first aerator. Ozone introduced by the air intake system passes through the air inlet radiant pipe, the second air inlet ring pipe, and the second aerators in sequence, realizing the ozone introduction into the second reaction zone. In the second reaction zone 5, ozone and sewage come into contact in the same direction, flowing from bottom to top, resulting in more thorough treatment. The first aeration device and the second aeration device form the aeration zone 4.

[0028] The air intake system 9 includes a first air intake pipe 91 and a second air intake pipe arranged vertically, and an inclined pipe extending downward from the lower end of the second air intake pipe. The upper ends of the first air intake pipe and the second air intake pipe are connected through a first air intake bend 93. The lower end of the inclined pipe is connected to a main air pipe through a second air intake bend 94. The end of the main air pipe away from the second bend is connected to the air inlet of the first aeration device and the air inlet of the second aeration device through branch pipes. Ozone generated by the front-end ozone generator enters the main air pipe sequentially through the first air intake pipe 91, the first air intake bend 93, the second air intake pipe, the inclined pipe, and the second air intake bend 94. Then, it enters the first reaction zone 3 and the second reaction zone 5 through two branch pipes. The first air intake bend 93 at the highest point of the air intake pipe is U-shaped. Before entering the reactor, the second air intake bend 94 is set to buffer the pressure shock caused by ozone start-up, shutdown, or pressure changes. A one-way valve 92 is installed on the first air inlet pipe, and the highest point of the first air inlet bend 93 is higher than the top cover to prevent sewage from being back into the air intake system.

[0029] A circumferentially closed water outlet trough 6 is fixedly connected to the upper end of the outer cylinder. The water outlet trough includes an annular bottom plate that is sealed and fixedly connected to the upper end of the outer cylinder, a first water baffle plate 61 extending upward from the annular bottom plate, and a third water baffle plate extending upward from the annular bottom plate and located around the first water baffle plate 61. An overflow area is formed above the first water baffle plate, connecting the inner cavity of the water outlet trough with the second reaction zone. A second water baffle plate 62 is fixedly installed inside the water outlet trough, located between the first and third water baffle plates. A flow passage area is formed between the lower end of the second water baffle plate and the annular bottom plate. The upper end of the second water baffle plate is higher than the upper end of the first water baffle plate. A water collection trough 63, which is lower than the upper edge of the first water baffle plate and higher than the flow passage area, is fixedly connected to the inner side wall of the third water baffle plate. A water outlet pipe 19, which communicates with the water collection trough, is provided on the side wall of the third water baffle plate. The water outlet pipe is welded to the third water baffle plate. A water outlet hole, which connects the water collection trough and the water outlet pipe, is opened on the third water baffle plate. In this embodiment, the first baffle plate, the second baffle plate, the third baffle plate, and the annular bottom plate are all closed circumferentially. When the liquid level in the second reaction zone reaches a certain height, it flows through the overflow zone into the outlet tank, and then through the flow zone into the annular area between the second baffle plate and the third baffle plate. When the liquid level between the second baffle plate and the third baffle plate rises to a certain height, it overflows into the collection tank and is discharged from the process section through the outlet pipe.

[0030] A top cover 11 is sealed and fixed to the upper end of the third partition. The top cover is an upwardly arched arc, forming the top of the tank and covering the first reaction zone, the second reaction zone, and the water outlet. The water inlet pipe passes downward through the top cover and is sealed and fixed to the top cover. A gas-liquid separator 21 is fixed between the top cover and the outer wall of the inner cylinder, located above the second reaction zone and the water outlet. An air passage chamber is formed above the gas-liquid separator, and an air passage slit 23 connecting the air passage chamber and the first reaction zone is formed between the upper end of the inner cylinder and the top cover. In this embodiment, the air passage slit is located between the upper edge of the water distribution flare and the top cover. In this embodiment, the gas-liquid separator 21 adopts a corrugated plate structure. When the gas-liquid mixture passes upward through the gas-liquid separator, the liquid is blocked by the corrugated plate and flows down along the corrugated plate. The gas flows upward through the gaps between the corrugated plates to achieve gas-liquid separation. After gas-liquid separation, the gas enters the water distribution zone 2 through the air passage 23.

[0031] A safety valve 17 and an exhaust solenoid valve 15 are installed on the top cover. A level gauge 18, electrically connected to the exhaust solenoid valve, is installed on the side wall of the outlet tank. The level gauge 18 is linked to the exhaust solenoid valve 15, which is connected to an ozone tail gas destruction device. During the treatment process, gas continuously accumulates at the top of the reactor, and the system maintains a slightly positive pressure. As the system operates, the gas continuously lowers the water level at the outlet tank. When the water level is lower than half the height difference between the first baffle plate 61 above the annular water collection tank 63 and the annular water collection tank 63, the exhaust solenoid valve 15 opens to release gas. The slightly positive pressure setting allows for more complete water distribution and gas-water reaction at the gas-water interface.

[0032] The circulation system 8 includes a circulation pipeline equipped with a return water pump 83 and a second flow meter 84. One end of the circulation pipeline is connected to the second reaction zone, and the other end extends to the top of the first reaction zone. The second flow meter 84 facilitates adjustment of the flow rate of the return water pump 83. In this embodiment, the circulation system allows some unreacted ozone to re-enter the first reaction zone with the wastewater. Simultaneously, ozone microbubbles in the first reaction zone continuously rise, further contacting the returned wastewater and the wastewater, thus improving ozone utilization.

[0033] Specifically, the circulation system includes a return branch pipe 81, a return inlet pipe I 82, a return water pump 83, a second flow meter 84, a return outlet pipe 85, a return distribution pipe 86, a water distribution ring pipe 87, and water distribution heads 88. Several return branch pipes 81 are evenly arranged circumferentially on the outer cylinder sidewall below the outlet trough, and the outlet ends of the return branch pipes converge at the return inlet pipe I 82. The inlet distribution pipe 86 adopts a central radial arrangement to improve the uniformity of water intake. The inlet distribution pipe 86 is connected to the water distribution ring pipe 87, which adopts a concentric multi-layer arrangement. Water distribution heads 88 are evenly distributed in the water distribution ring pipe, and the water distribution heads are short pipes to achieve high-flow-rate water distribution. Returned wastewater is collected by the return branch pipe 81 and enters the return inlet pipe I 82, then sequentially flows through the return outlet pipe and the return distribution pipe into the water distribution ring pipe, and finally flows out through the water distribution heads.

[0034] In this embodiment, the concentric annular water distribution allows the water to be distributed in a surface manner, enabling it to come into contact again with the ozone that has not fully reacted in the first and second reaction zones, thereby increasing the ozone utilization rate.

[0035] This embodiment describes a method for using an ozone reactor for industrial wastewater treatment, including the following aspects: a) Wastewater to be treated is injected into the inner cylinder through the inlet pipe and flows from top to bottom within the inner cylinder. Ozone enters the inner cylinder through the first aeration device and flows from bottom to top. The ozone comes into contact with the wastewater in the first reaction zone and reacts; b) As the ozone rises, a retention plate blocks some of the ozone bubbles, causing them to remain in the retention zone. As the number of ozone bubbles in the retention zone increases, they move out of the retention zone from the lower edge of the retention plate and continue to move upward into the next retention zone; c) Flow from the first reaction zone... The wastewater enters the second reaction zone from the bottom of the inner cylinder and flows upward simultaneously with the ozone introduced through the second aeration device, reacting with the ozone in the second reaction zone; d. The wastewater in the second reaction zone enters the effluent tank through the overflow zone, flows upward after passing through the flow zone, then enters the collection tank, and flows out through the effluent pipe; e. As the wastewater treatment proceeds, gas accumulates at the top of the reactor, and the system maintains a slightly positive pressure. As the pressure continuously increases, it continuously lowers the effluent level. When the liquid level is lower than 1 / 2 the height difference between the first baffle plate above the collection tank and the collection tank, the exhaust solenoid valve opens to release gas.

[0036] This invention provides a highly efficient ozone reactor that utilizes ozone. It employs a dual-reaction-zone design with inner and outer cylinders to improve ozone utilization. It can be used not only for nanofiltration and reverse osmosis membrane concentrate treatment but also directly for the treatment of recalcitrant industrial organic wastewater. Specifically, several retention plates are installed in the first reaction zone, which not only extends the wastewater flow but also creates an ozone retention zone at the bottom of the retention plates, enhancing ozone-wastewater contact and improving ozone utilization. A high-efficiency ceramic aerator with microbubble particle size ≤80 micrometers is used, further improving gas-water reaction efficiency. A control method linking liquid level and exhaust solenoid valves ensures the reactor operates under slight positive pressure, improving gas-liquid interface mass transfer efficiency and increasing ozone reaction efficiency. The reactor uses a high-flow-rate recirculation water distribution system, enhancing the contact between ozone microbubbles and wastewater. Simultaneously, a disc-type water distribution system further improves the utilization rate of unreacted ozone in the exhaust gas. The ozone system's inlet pipe features a U-shaped bend structure to ensure safe system operation.

[0037] Of course, the above description is not limited to the examples above. Technical features not described in this invention can be implemented by or using existing technology, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solutions of this invention and are not intended to limit this invention. This invention has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this invention do not depart from the spirit of this invention and should also fall within the scope of protection of the claims of this invention.

Claims

1. An ozone reactor for industrial wastewater treatment, comprising an inner cylinder (12), wherein an inlet pipe (73) is provided at the top of the inner cylinder, and a first aeration device (41) is provided at the bottom of the inner cylinder, wherein the inner cylinder cavity between the inlet pipe and the first aeration device forms a first reaction zone (3), characterized in that: The first reaction zone (3) is fixed with several retention plates (31) arranged vertically at intervals. One end of the retention plate is sealed and fixed to the inner cylinder side wall, and the other end of the retention plate is inclined downward. Retention zones (32) are formed below each retention plate.

2. The ozone reactor for industrial wastewater treatment according to claim 1, characterized in that: The vertical projections of two adjacent vertical stagnation plates (31) have overlapping portions, and each stagnation plate forms an S-shaped gas channel.

3. The ozone reactor for industrial wastewater treatment according to claim 1, characterized in that: It also includes an outer cylinder (13), the inner cylinder (12) is located inside the outer cylinder (13), a second reaction zone (5) is formed between the inner cylinder and the outer cylinder, the bottom of the inner cylinder is provided with a through hole connecting the first reaction zone (3) and the second reaction zone (5), and the bottom of the second reaction zone (5) is provided with a second aeration device (43).

4. An ozone reactor for industrial wastewater treatment according to claim 3, characterized in that: It also includes a circulation system (8), which includes a circulation pipeline equipped with a return water pump (83), one end of which is connected to the second reaction zone and the other end of which extends to the top of the first reaction zone.

5. An ozone reactor for industrial wastewater treatment according to claim 3, characterized in that: It also includes a first air inlet pipe (91) and a second air inlet pipe arranged vertically, as well as an inclined pipe extending downward from the lower end of the second air inlet pipe. The upper end of the first air inlet pipe is connected to the upper end of the second air inlet pipe through a first air inlet bend (93). The lower end of the inclined pipe is connected to a main air pipe through a second air inlet bend (94). The end of the main air pipe away from the second bend is connected to the air inlet of the first aeration device and the air inlet of the second aeration device through a branch pipe.

6. An ozone reactor for industrial wastewater treatment according to claim 3, characterized in that: The upper end of the outer cylinder is fixedly connected to a circumferentially closed water outlet groove (6). The water outlet groove includes an annular bottom plate that is sealed and fixedly connected to the upper end of the outer cylinder, a first water baffle plate (61) extending upward from the annular bottom plate, and a third water baffle plate extending upward from the annular bottom plate and located outside the first water baffle plate (61). An overflow area is formed above the first water baffle plate, connecting the inner cavity of the water outlet groove with the second reaction zone. A second water baffle plate (62) is fixedly provided in the water outlet groove between the first water baffle plate and the third water baffle plate. A flow passage area is formed between the lower end of the second water baffle plate and the annular bottom plate. The upper end of the second water baffle plate is higher than the upper end of the first water baffle plate. A water collection groove (63) that is lower than the upper edge of the first water baffle plate and higher than the flow passage area is fixedly connected to the inner side wall of the third water baffle plate. A water outlet pipe (19) that communicates with the water collection groove is provided on the side wall of the third water baffle plate.

7. An ozone reactor for industrial wastewater treatment according to claim 6, characterized in that: The upper end of the third partition is sealed with a top cover (11). A gas-liquid separator (21) located above the second reaction zone and the water outlet tank is fixed between the top cover and the outer wall of the inner cylinder. An air passage cavity is formed above the gas-liquid separator. An air passage slit (23) connecting the air passage cavity and the first reaction zone is formed between the upper end of the inner cylinder and the top cover.

8. An ozone reactor for industrial wastewater treatment according to claim 7, characterized in that: The lower end of the water inlet pipe is fixedly connected to a water distribution ring pipe (87), and the bottom surface of the water distribution ring pipe (87) is fixedly connected to several water distribution heads (88) arranged circumferentially. The upper end of the inner cylinder is provided with a water distribution flare (22) that is larger at the top and smaller at the bottom. The inner diameter of the upper end of the water distribution flare is larger than the outer diameter of the water distribution ring pipe.

9. An ozone reactor for industrial wastewater treatment according to claim 7, characterized in that: An exhaust solenoid valve (15) is installed on the top cover, and a level gauge (18) electrically connected to the exhaust solenoid valve is installed on the side wall of the water outlet tank.

10. A method of using an ozone reactor for industrial wastewater treatment according to any one of claims 6 to 9, characterized in that, The process includes the following aspects: a) Wastewater to be treated is injected into the inner cylinder through the inlet pipe and flows from top to bottom within the inner cylinder. Ozone enters the inner cylinder through the first aeration device and flows from bottom to top. The ozone comes into contact with the wastewater in the first reaction zone and reacts with it; b) As the ozone rises, a retention plate blocks some of the ozone bubbles, causing them to remain in the retention zone. As the number of ozone bubbles in the retention zone increases, they move out of the retention zone from the lower edge of the retention plate and continue to move upward into the next retention zone; c) Wastewater flowing down from the first reaction zone enters the second reaction zone through the bottom of the inner cylinder and flows upward simultaneously with the ozone introduced through the second aeration device, reacting with the ozone in the second reaction zone. d. Wastewater in the second reaction zone enters the effluent tank through the overflow zone, flows upward after passing through the flow zone, then enters the collection tank, and flows out through the effluent pipe; e. As wastewater treatment proceeds, gas accumulates at the top of the reactor, and the system maintains a slightly positive pressure. As the pressure increases, it continuously lowers the effluent level. When the liquid level is lower than 1 / 2 the height difference between the first baffle plate above the collection tank and the collection tank, the exhaust solenoid valve opens to release gas.

Images