Ozone tail gas membrane cell release system and ozone tail gas utilization method

Abstract

The application discloses an ozone tail gas membrane cell release system and an ozone tail gas utilization method. The ozone tail gas membrane cell release system comprises a membrane cell, an ozone reaction cell, an ozone generating assembly and a tail gas utilization assembly. The membrane cell is provided with a membrane group device, a water outlet of the membrane group device is communicated to the ozone reaction cell, and the ozone reaction cell is provided with a tail gas outlet. The ozone generating assembly comprises a high-pressure oxygen supply pipe, an ozone generator, a first aerator and a second aerator. The first aerator is arranged in the ozone reaction cell, the second aerator is arranged in the membrane cell, the ozone generator is communicated to the first aerator to provide ozone for the ozone reaction cell. The tail gas utilization assembly comprises an energy exchange device. The tail gas outlet is communicated to a low-pressure side of the energy exchange device. An outlet of the low-pressure side is communicated to the second aerator. The high-pressure oxygen supply pipe is communicated to a high-pressure side of the energy exchange device. An outlet of the high-pressure side is communicated to an air inlet of the ozone generator.

Description

Technical Field

[0001] The present application relates to the technical field of sewage treatment, and in particular to an ozone tail gas membrane pool release system and an ozone tail gas utilization method. Background Art

[0002] Membrane bioreactors are widely used in water treatment, particularly in industrial water treatment. They offer advantages such as strong shock resistance, the ability to retain all microorganisms within the reaction tank, and the elimination of sludge loss in sedimentation tanks. However, organic compounds in wastewater can contaminate the membranes in the membrane bioreactor, affecting its stable operation and increasing equipment operating costs.

[0003] In the related art, ozone is usually combined with a membrane pool to reduce the pollution of the filter membrane, thereby reducing the operating cost of the equipment. The principle is to use the strong oxidizing property of ozone to oxidize and catalyze the various organic and inorganic substances in the sewage, realize the decomposition of pollutants, and thus reduce the pollution of the membrane bioreactor by organic matter. In the related art, there is no reasonable technical solution for the diffusion and release of ozone in the activated sludge of the membrane bioreactor. In order to achieve the release of gas in the sewage, a blower or compressor is usually used for pressurization, and then the gas is released into the activated sludge through an aeration head. However, the cost of blower or compressor pressurization is relatively high, which weakens the cost-reducing effect of combining ozone with a membrane pool. Summary of the Invention

[0004] In order to solve at least one of the above technical problems, the present application provides an ozone tail gas membrane pool release system and an ozone tail gas utilization method, which can realize the ozone tail gas in the ozone reaction pool being pressurized and reused in the membrane pool. The technical solution adopted is as follows.

[0005] The ozone tail gas membrane pool release system provided in the first aspect of the present application includes a membrane pool, an ozone reaction pool, an ozone generating assembly, and a tail gas utilization assembly. The membrane pool is provided with a membrane module; the water outlet of the membrane module is connected to the ozone reaction pool, and the ozone reaction pool is provided with a tail gas outlet; the ozone generating assembly includes a high-pressure oxygen supply pipe, an ozone generator, a first aerator, and a second aerator, the first aerator being provided in the ozone reaction pool, the second aerator being provided in the membrane pool, and the ozone generator being connected to the first aerator to provide ozone to the ozone reaction pool; the tail gas utilization assembly includes an energy exchange device, the tail gas outlet being connected to the low-pressure side of the energy exchange device, the outlet of the low-pressure side being connected to the second aerator, the high-pressure oxygen supply pipe being connected to the high-pressure side of the energy exchange device, and the outlet of the high-pressure side being connected to the air inlet of the ozone generator.

[0006] In certain embodiments of the first aspect of the present application, the exhaust gas utilization component further includes a steam-water separation device, which is arranged between the exhaust gas outlet and the inlet of the low-pressure side of the energy exchange device.

[0007] In certain embodiments of the first aspect of the present application, the ozone generating assembly further includes a pressure reducing valve, which is disposed between an air inlet of the ozone generator and an outlet on a high-pressure side of the energy exchange device.

[0008] In certain embodiments of the first aspect of the present application, the ozone generating assembly further includes a stop valve and a flow control valve, the stop valve being arranged between the air inlet of the ozone generator and the outlet of the high-pressure side of the energy exchange device, and the stop valve being arranged in parallel with the pressure reducing valve, and the flow control valve being arranged upstream of the stop valve to control the high-pressure oxygen supply pipe to be connected to either the stop valve or the pressure reducing valve.

[0009] In certain embodiments of the first aspect of the present application, the second aerator includes a releaser, which is arranged at the bottom of the membrane module to release ozone toward the membrane module. The releaser includes a ventilation groove and a plurality of spiral releasers, and the plurality of spiral releasers are arranged at intervals along the length direction of the ventilation groove.

[0010] In certain embodiments of the first aspect of the present application, the releaser includes a plurality of the vent grooves, and the plurality of the vent grooves are arranged in an array at the bottom of the membrane module.

[0011] In certain embodiments of the first aspect of the present application, the second aerator further comprises a diffuser, the diffuser cover being disposed at the gas outlet of the spiral releaser, the inner wall of the diffuser being provided with a gas runway, and the gas runway being used for diffusion of ozone.

[0012] In certain embodiments of the first aspect of the present application, the ozone tail gas membrane pool release system also includes a biochemical pool and a reflux pump. The biochemical pool is arranged upstream of the membrane pool and connected to the membrane pool. The reflux pump is used to return the mixed liquid in the membrane pool to the biochemical pool.

[0013] In a second aspect, the present application also provides a method for utilizing ozone tail gas, comprising:

[0014] The ozone tail gas generated by the ozone reaction tank is introduced into the low-pressure side of the energy exchange device;

[0015] The high-pressure oxygen supply pipe is connected to the high-pressure side of the energy exchange device to exchange energy with the ozone tail gas;

[0016] The pressurized ozone tail gas is passed into the second aerator to provide ozone to the membrane tank;

[0017] Passing the decompressed supply gas into an ozone generator to generate ozone using the supply gas;

[0018] The ozone generated by the ozone generator is introduced into the first aerator to provide ozone to the ozone reaction tank;

[0019] Collect ozone tail gas from the ozone reaction tank.

[0020] In certain embodiments of the second aspect of the present application, before the energy exchange device is turned on, the ozone tail gas utilization method further includes:

[0021] Switch the flow control valve to connect the high-pressure oxygen supply pipe to the branch where the pressure reducing valve is located;

[0022] The supply gas is decompressed by a pressure reducing valve and then passed into the ozone generator.

[0023] The embodiments of the present application have at least the following beneficial effects: the present application sets up an energy exchange device, and utilizes the high-pressure side of the energy exchange device to release and reduce the pressure of the high-pressure oxygen supply pipe. In the energy exchange device, the energy on the high-pressure side can be utilized by the gas on the low-pressure side, so that the pressure released by the liquid oxygen in the high-pressure oxygen supply pipe can be used to pressurize the ozone exhaust gas on the low-pressure side. On the one hand, it can realize the pressure reduction of the high-pressure supply gas (such as liquid oxygen) to meet the receiving requirements of the ozone generator. On the other hand, the ozone exhaust gas collected in the ozone reaction tank does not need to be pressurized by an additional blower or compressor, saving the cost required for pressurizing the ozone exhaust gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The aspects and advantages described and / or attached in the embodiments of the present application will become apparent and easily understood in conjunction with the following drawings. It should be noted that the embodiments embodied in the following drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0025] Figure 1 A schematic structural diagram of an example of an ozone tail gas membrane pool release system provided in an embodiment of the present application;

[0026] Figure 2 A schematic structural diagram of another example of an ozone tail gas membrane pool release system provided in an embodiment of the present application;

[0027] Figure 3 A schematic diagram of the membrane pool structure in the ozone tail gas membrane pool release system provided in an embodiment of the present application;

[0028] Figure 4 This is a flow chart of the ozone tail gas utilization method provided in an embodiment of the present application.

[0029] Figure numerals: 100, ozone tail gas membrane pool release system; 10, membrane pool; 11, membrane module; 12, water production pump; 20, ozone reaction tank; 21, tail gas outlet; 22, ozone tail gas destroyer; 30, ozone generating assembly; 31, high-pressure oxygen supply pipe; 311, liquid oxygen station; 32, ozone generator; 33, first aerator; 34, second aerator; 341, ventilation tank; 342, spiral releaser; 35, pressure reducing valve; 36, stop valve; 37, flow control valve; 40, tail gas utilization assembly; 41, energy exchange device; 411, high-pressure side; 412, low-pressure side; 42, steam-water separation device; 50, biochemical pool. DETAILED DESCRIPTION

[0030] The following combination Figures 1 to 4 Embodiments of the present application are described in detail, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and are not to be construed as limiting the present application.

[0031] In the description of this application, it should be understood that if the terms "center", "middle", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, unless otherwise specified, "multiple" means two or more.

[0032] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0033] First, see Figure 1The present application provides an ozone tail gas membrane tank release system 100, comprising a membrane tank 10, an ozone reaction tank 20, an ozone generating assembly 30, and a tail gas utilization assembly 40. A membrane module 11 is provided in the membrane tank 10, the water outlet of the membrane module 11 being connected to the ozone reaction tank 20, and the ozone reaction tank 20 being provided with a tail gas outlet 21. The ozone generating assembly 30 comprises a high-pressure oxygen supply pipe 31, an ozone generator 32, a first aerator 33, and a second aerator 34. The first aerator 33 is provided in the ozone reaction tank 20, and the second aerator 34 is provided in the membrane tank 10. The ozone generator 32 is connected to the first aerator 33 to provide ozone to the ozone reaction tank 20. The exhaust gas utilization component 40 includes an energy exchange device 41, the exhaust gas outlet 21 is connected to the low-pressure side 412 of the energy exchange device 41, the outlet of the low-pressure side 412 is connected to the second aerator 34, the high-pressure oxygen supply pipe 31 is connected to the high-pressure side 411 of the energy exchange device 41, and the outlet of the high-pressure side 411 is connected to the air inlet of the ozone generator 32.

[0034] The present application sets an energy exchange device 41, and utilizes the high-pressure side 411 of the energy exchange device 41 to release and reduce the pressure of the high-pressure oxygen supply pipe 31. In the energy exchange device 41, the energy on the high-pressure side 411 can be utilized by the gas on the low-pressure side 412, so that the pressure released by the liquid oxygen in the high-pressure oxygen supply pipe 31 can be used to pressurize the ozone tail gas on the low-pressure side 412. On the one hand, it can realize the pressure reduction of the high-pressure supply gas (such as liquid oxygen) to meet the receiving requirements of the ozone generator 32. On the other hand, the ozone tail gas collected in the ozone reaction tank 20 does not need to be pressurized by an additional blower or compressor, but is pressurized by the pressure released by the supply gas of the ozone generator 32 to reach the pressure required for aeration, further saving the cost required for pressurizing the ozone tail gas. The pressurized ozone tail gas can be passed into the second aerator 34 to release ozone in the membrane pool 10. The ozone is used to react with the organic pollutants in the membrane pool 10, which can reduce the pollution of the organic pollutants to the membrane module 11 and improve the stability and reliability of the membrane bioreactor operation. The present application increases the application scenarios of ozone in the sewage treatment system by recycling the ozone tail gas in the ozone reaction pool 20 to the membrane pool 10, fully utilizes the pressure of the high-pressure supply gas of the ozone generator 32, reduces the waste of ozone tail gas and the waste of the pressure of the high-pressure supply gas, makes the ozone application and energy utilization of the entire sewage treatment system more reasonable, and thus reduces the cost of ozone generation.

[0035] It is understandable that the gas supply source of the ozone generator 32 is usually liquid oxygen, and the pressure of liquid oxygen is usually 0.3-0.5Mpa. However, the receiving pressure of the ozone generator 32 usually needs to be less than 0.1Mpa. Therefore, a pressure reducing valve 35 is usually provided at the air inlet of the ozone generator 32, and the pressure reducing valve 35 is used to reduce the pressure of the liquid oxygen from 0.3-0.5Mpa to 0.1Mpa. Therefore, a surplus air pressure of 0.2-0.4Mpa is generated here. In the related art, these surplus air pressures are usually released and wasted. However, in the present application, by providing an energy exchange device 41, these surplus air pressure energies can be reused and used to pressurize the ozone tail gas. The upstream of the high-pressure oxygen supply pipe 31 can be connected to the liquid oxygen station 311, and the liquid oxygen station 311 is used to provide raw materials for generating ozone.

[0036] For example, the energy exchange device 41 utilizes the pressure turbine principle for energy recovery. Specifically, high-pressure liquid oxygen enters the energy exchange device, where it is converted into mechanical energy through an impeller. The impeller then rotates a shaft, the other end of which is connected to another impeller. This impeller then pressurizes the low-pressure ozone tail gas, thereby converting pressure energy into mechanical energy and back to pressure energy. The other components and operation of the energy exchange device 41 are well-known to those skilled in the art and will not be described in detail here.

[0037] Optionally, filtered water from the membrane tank 10 is collected through the water outlet of the membrane module 11, pressurized by the water pump 12, and then transferred to the ozone reaction tank 20 for further purification. The ozone reaction tank 20 may also be equipped with an ozone tail gas destroyer 22. The ozone tail gas destroyer 22 can promptly decompose unused ozone tail gas in the ozone reaction tank 20 to prevent ozone from escaping.

[0038] In some embodiments, the exhaust gas utilization assembly 40 further includes a steam-water separator 42, which is disposed between the exhaust gas outlet 21 and the inlet of the low-pressure side 412 of the energy exchange device 41. The steam-water separator 42 can reduce the water vapor content in the ozone exhaust gas and remove liquid water that overflows with bubbles from the ozone reaction tank 20, thereby preventing large-scale condensation of water vapor in the pipeline, which could reduce the efficiency of the energy exchange device 41 and even block the energy exchange device 41. Exemplarily, the steam-water separator 42 is a steam-water separator tank.

[0039] In some embodiments, see Figure 2The ozone generating assembly 30 further includes a pressure reducing valve 35, which is disposed between the air inlet of the ozone generator 32 and the outlet of the high-pressure side 411 of the energy exchange device 41. When the ozone generator 32 is initially started, the ozone generator 32 initially introduces ozone into the ozone reaction tank 20. At this time, the ozone reaction tank 20 has not yet produced ozone tail gas. At this time, no low-pressure ozone tail gas is introduced into the low-pressure side 412 of the energy exchange device 41. Therefore, the energy exchange device 41 cannot reduce the pressure of the high-pressure supply gas. At this time, in order to ensure that the high-pressure supply gas can be reduced to an appropriate pressure level, a pressure reducing valve 35 is disposed upstream of the ozone generator 32. The pressure reducing valve 35 can reduce the pressure of the high-pressure supply gas in the high-pressure supply pipe when the energy generating device is not activated, thereby reducing the pressure of the supply gas to a pressure that the ozone generator 32 can receive, thereby ensuring the safety and reliability of the operation of the ozone generator 32. It is understood that when sufficient ozone tail gas has been generated in the ozone reaction tank 20 and the energy exchange device 41 has been activated, the energy exchange device 41 can reduce the pressure of the supply gas in the high-pressure supply pipe, and the pressure reducing valve 35 can be disabled. Of course, in other examples, to ensure that the pressure of the supply gas entering the ozone generator 32 is sufficiently low and stable, the pressure reducing valve 35 can also be activated when the energy exchange device 41 is activated, which is not limited here.

[0040] In some embodiments, the ozone generating assembly 30 further includes a shut-off valve 36, which is disposed between the air inlet of the ozone generator 32 and the outlet of the high-pressure side 411 of the energy exchange device 41, and is disposed in parallel with the pressure reducing valve 35. The shut-off valve 36 can be used to cut off the passage between the energy exchange device 41 and the ozone generator 32. When shutting down the ozone tail gas membrane pool release system 100, the energy exchange device 41 can be shut down, and the shut-off valve 36 can be closed to prevent the gas supply in the high-pressure gas supply pipe from entering the ozone generator 32, thereby stopping the ozone generator 32 from generating ozone. Accordingly, the generation of ozone tail gas also stops, thereby achieving the shutdown operation of the ozone tail gas membrane pool release system 100.

[0041] In some embodiments, the ozone generating assembly 30 further includes a flow control valve 37 disposed upstream of the shutoff valve 36 to control whether the high-pressure oxygen supply pipe 31 is connected to the shutoff valve 36 or the pressure reducing valve 35. The flow control valve 37 can be used to selectively control whether the high-pressure vent pipe is connected to the branch where the shutoff valve 36 or the pressure reducing valve 35 is located, thereby enabling the entire ozone tail gas membrane tank release system 100 to be shut down or enabled.

[0042] In some embodiments, see Figure 3The second aerator 34 includes a releaser, which is arranged at the bottom of the membrane module 11 to release ozone toward the membrane module 11. The releaser includes a venting groove 341 and a plurality of spiral releasers 342. The plurality of spiral releasers 342 are arranged at intervals along the length of the venting groove 341. The releaser can release the ozone tail gas in the pipeline into the membrane pool 10, so that the ozone tail gas can come into contact with the pollutants (such as sludge, pollutants dissolved in water, etc.) in the membrane pool 10, and the membrane pool sludge mixed liquid is regulated by ozone, thereby reducing the system membrane fouling potential and thus reducing membrane fouling. It is understandable that in other examples, a perforated aeration tube can be used instead of the spiral releaser 342. The perforated aeration tube is a tube with a plurality of aeration holes on the surface. By setting the tube in the membrane pool 10 and pressurizing the ozone tail gas using the energy exchange device 41 to achieve sufficient aeration pressure, the ozone tail gas can be released through the aeration holes in the membrane pool 10, thereby realizing the recycling of the ozone tail gas.

[0043] In some embodiments, the releaser includes a plurality of vent slots 341 arranged in an array at the bottom of the membrane module 11. The provision of multiple vent slots 341 increases the aeration area, so that the outlet position of the ozone tail gas corresponds to the membrane module 11, shortens the travel distance of the ozone tail gas, and improves the contact effect between the ozone tail gas and the membrane surface, sludge, and sewage, thereby improving the reaction efficiency between the ozone tail gas and pollutants.

[0044] In some embodiments, the second aerator 34 further includes a diffuser, which is positioned over the outlet of the spiral releaser 342. The inner wall of the diffuser is provided with a gas runway for ozone diffusion. The diffuser can further decompose the ozone tail gas into smaller bubbles, further increasing the contact area between the ozone tail gas and the pollutants. Through the mixed flow and disturbance of the membrane filaments in the membrane module 11, the ozone and sludge can fully react, thereby improving the reaction efficiency of the ozone and sludge and enhancing the ozone's decomposition effect on pollutants. Furthermore, the diffuser can further mix the ozone tail gas with the activated sludge during the spiral rise, diffusing it into the activated sludge in the membrane tank 10 through the holes above the diffuser. At the same time, the activated sludge is replenished into the diffuser through the space at the bottom of the diffuser. The ozone tail gas contacts the membrane module 11 and is dispersed between the membrane filaments. Due to the capillary adsorption between the membrane filaments, the residence time of the ozone in the membrane tank 10 is extended, thereby improving the ozone utilization efficiency and avoiding the safety issues caused by ozone overflowing the membrane tank 10. Other structures and operations of the releaser and diffuser have been recorded in the relevant technology by ordinary technicians in this field and will not be described in detail here.

[0045] In some embodiments, the ozone tail gas membrane pool release system 100 further includes a biochemical pool 50 and a reflux pump. The biochemical pool 50 is arranged upstream of the membrane pool 10 and is connected to the membrane pool 10. The reflux pump is used to return the mixed liquid in the membrane pool 10 to the biochemical pool 50. By using the biochemical pool 50, the organic matter in the sewage can be degraded by the microorganisms therein to achieve water purification. The biochemical pool 50 can also maintain a high sludge concentration, which helps to accelerate the biochemical reaction. By using the membrane pool 10, the sludge and water in the biochemical pool 50 can be separated. The filtered water separated by the membrane module 11 can enter the ozone reaction pool 20 for reaction, and the sludge is retained in the membrane pool 10. By using the reflux pump, the mixed liquid of sludge and muddy water can be returned from the membrane pool 10 to the biochemical pool 50, ensuring that the sludge concentration in the system is maintained at a stable level.

[0046] The following is the operation process of the ozone tail gas membrane pool release system 100:

[0047] The sewage is passed into a biochemical tank 50, where the activated sludge in the tank fully reacts and decomposes the sewage. The resulting mixture is then passed into a membrane tank 10, where the membrane module 11 filters and separates the sludge from the water. The filtered water is collected through the water outlet of the membrane module 11 and passed into the ozone reaction tank 20. The first aerator 33 in the ozone reaction tank 20 releases ozone, which mixes and reacts with the filtered water in the ozone reaction tank 20. The ozone's catalytic oxidation of the sewage further purifies the wastewater, which is then discharged to the next treatment system.

[0048] At the same time, the high-pressure oxygen supply pipe 31 provides supply gas (high-pressure liquid oxygen), which enters the high-pressure side 411 of the energy exchange device 41 for decompression. The decompressed supply gas enters the ozone generator 32 to generate ozone, which is then passed into the first aerator 33 to provide ozone to the ozone reaction tank 20. At the same time, the ozone tail gas in the ozone reaction tank 20 is collected and passed into the low-pressure side 412 of the energy exchange device 41. The ozone tail gas is pressurized to an appropriate pressure using the pressure energy of the high-pressure liquid oxygen and then passed into the second aerator 34 to provide ozone to the membrane tank 10, thereby enabling the ozone tail gas from the ozone reaction tank 20 to be reused in the membrane tank 10.

[0049] Second, see Figure 4 , the present application also provides a method for utilizing ozone tail gas, comprising:

[0050] S1. The ozone tail gas generated by the ozone reaction tank is passed into the low-pressure side of the energy exchange device;

[0051] S2. The high-pressure oxygen supply pipe is connected to the high-pressure side of the energy exchange device to exchange energy with the ozone exhaust gas;

[0052] It is understandable that the above steps S1 and S2 can be performed simultaneously in the energy exchange device 41, or step S2 can be performed before step S1. The high-pressure gas (supply gas) and low-pressure gas (ozone tail gas) are respectively introduced into the high-pressure side 411 and the low-pressure side 412 of the energy exchange device 41 at the same time, thereby realizing energy exchange from the high-pressure side 411 to the low-pressure side 412 in the energy exchange device 41, achieving the effect of reducing the pressure of the supply gas and increasing the pressure of the ozone tail gas.

[0053] S3. The pressurized ozone tail gas is passed into the second aerator to provide ozone to the membrane tank;

[0054] S4. The decompressed gas supply is passed into the ozone generator to generate ozone using the gas supply;

[0055] It is understood that the above steps S3 and S4 can be performed simultaneously, or step S4 can be performed before step S3. The depressurized supply gas enters the ozone generator 32, while the pressurized ozone tail gas is passed to the second aerator 34 to achieve aeration in the membrane tank 10.

[0056] S5. The ozone generated by the ozone generator is passed into the first aerator to provide ozone to the ozone reaction tank;

[0057] S6. Collect ozone tail gas from the ozone reaction tank.

[0058] Optionally, after step S6 is completed, the ozone tail gas utilization method can re-perform step S1 to achieve secondary utilization of the ozone tail gas.

[0059] By utilizing the ozone tail gas in the above manner, the high-pressure side 411 of the energy exchange device 41 can be used to release and reduce the pressure of the high-pressure oxygen supply pipe 31, and the ozone tail gas on the low-pressure side 412 can be pressurized. The ozone tail gas is used to react with organic pollutants in the membrane pool 10, thereby reducing the contamination of the membrane module 11 by organic pollutants and improving the stability and reliability of the membrane bioreactor operation. By fully utilizing the pressure of the high-pressure supply gas of the ozone generator 32, the waste of ozone tail gas and the waste of the pressure of the high-pressure supply gas are reduced, making the ozone application and energy utilization of the entire sewage treatment system more reasonable, thereby reducing the cost of ozone generation.

[0060] In some embodiments, before the energy exchange device 41 is turned on, the ozone tail gas utilization method further includes:

[0061] S7. Switch the flow control valve so that the high-pressure oxygen supply pipe is connected to the branch where the pressure reducing valve is located;

[0062] S8. Use a pressure reducing valve to reduce the pressure of the supply gas and then pass it into the ozone generator.

[0063] The pressure reducing valve 35 is used to reduce the pressure of the supply gas in the high-pressure oxygen supply pipe 31 , so that the supply gas can be reduced in pressure before the energy exchange device 41 is activated, ensuring that the gas entering the ozone generator 32 meets the receiving pressure of the ozone generator 32 .

[0064] In the description of this specification, if the reference terms "one embodiment," "some examples," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples" appear, it means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples.

[0065] The above describes the implementation methods of the present application in detail in conjunction with the accompanying drawings, but the present application is not limited to the above implementation methods. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the technical field without departing from the purpose of the present application.

[0066] In the description of this application, if the "," appears in the patent title, it indicates an "and" relationship, not an "or" relationship. For example, if the patent title is "A, B", it means that the content protected by this application is: the technical solution of the subject name A and the technical solution of the subject name B.

Claims

1. An ozone tail gas membrane pool release system, characterized by: include A membrane pool, wherein a membrane module is provided in the membrane pool; An ozone reaction tank, wherein the water outlet of the membrane module is connected to the ozone reaction tank, and the ozone reaction tank is provided with an exhaust gas outlet; an ozone generating assembly, comprising a high-pressure oxygen supply pipe, an ozone generator, a first aerator, and a second aerator, wherein the first aerator is disposed in the ozone reaction tank, the second aerator is disposed in the membrane tank, and the ozone generator is connected to the first aerator to provide ozone to the ozone reaction tank; A tail gas utilization component, comprising an energy exchange device, wherein the tail gas outlet is connected to the low-pressure side of the energy exchange device, the outlet of the low-pressure side is connected to the second aerator, the high-pressure oxygen supply pipe is connected to the high-pressure side of the energy exchange device, and the outlet of the high-pressure side is connected to the air inlet of the ozone generator; The tail gas utilization component further includes a steam-water separation device, which is arranged between the tail gas outlet and the inlet of the low-pressure side of the energy exchange device; The ozone generating assembly further comprises a pressure reducing valve, which is arranged between the air inlet of the ozone generator and the outlet of the high pressure side of the energy exchange device; The ozone generating assembly also includes a stop valve and a flow control valve. The stop valve is arranged between the air inlet of the ozone generator and the outlet of the high-pressure side of the energy exchange device, and the stop valve is arranged in parallel with the pressure reducing valve. The flow control valve is arranged upstream of the stop valve to control the high-pressure oxygen supply pipe to be connected to either the stop valve or the pressure reducing valve.

2. The ozone tail gas membrane pool release system according to claim 1 is characterized in that: The second aerator includes a releaser, which is arranged at the bottom of the membrane module to release ozone into the membrane module. The releaser includes a ventilation groove and a plurality of spiral releasers, and the plurality of spiral releasers are arranged at intervals along the length direction of the ventilation groove.

3. The ozone tail gas membrane pool release system according to claim 2 is characterized in that: The releaser includes a plurality of vent grooves, and the plurality of vent grooves are arranged in an array at the bottom of the membrane module.

4. The ozone tail gas membrane pool release system according to claim 2 is characterized in that: The second aerator further comprises a diffuser, wherein the diffuser cover is arranged at the gas outlet of the spiral releaser, and the inner wall of the diffuser is provided with a gas runway, and the gas runway is used for diffusion of ozone.

5. The ozone tail gas membrane pool release system according to claim 1 is characterized in that: The ozone tail gas membrane pool release system also includes a biochemical pool and a reflux pump. The biochemical pool is arranged upstream of the membrane pool and connected to the membrane pool. The reflux pump is used to return the mixed liquid in the membrane pool to the biochemical pool.

6. A method for utilizing ozone tail gas, using the ozone tail gas membrane pool release system according to any one of claims 1 to 5, characterized in that: include The ozone tail gas generated by the ozone reaction tank is introduced into the low-pressure side of the energy exchange device; The high-pressure oxygen supply pipe is connected to the high-pressure side of the energy exchange device to exchange energy with the ozone tail gas; The pressurized ozone tail gas is passed into the second aerator to provide ozone to the membrane tank; Passing the decompressed supply gas into an ozone generator to generate ozone using the supply gas; The ozone generated by the ozone generator is introduced into the first aerator to provide ozone to the ozone reaction tank; Collect ozone tail gas from the ozone reaction tank.

7. The ozone tail gas utilization method according to claim 6, characterized in that: Before the energy exchange device is turned on, the ozone tail gas utilization method further includes: Switch the flow control valve to connect the high-pressure oxygen supply pipe to the branch where the pressure reducing valve is located; The supply gas is decompressed by a pressure reducing valve and then passed into the ozone generator.

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