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

Abstract

The invention discloses an ozone tail gas membrane pool release system and an ozone tail gas utilization method, and the ozone tail gas membrane pool release system comprises a membrane pool, an ozone reaction pool, an ozone generation assembly and a tail gas utilization assembly. A membrane module is arranged in the membrane tank, a water production port of the membrane module is communicated to the ozone reaction tank, and the ozone reaction tank is provided with a tail gas outlet. The ozone generation 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 tank, the second aerator is arranged in the membrane tank, and the ozone generator is communicated with the first aerator to provide ozone for the ozone reaction tank; the tail gas utilization assembly comprises an energy exchange device, a tail gas outlet communicates with the low-pressure side of the energy exchange device, an outlet of the low-pressure side communicates with the second aerator, a high-pressure oxygen supply pipe communicates with the high-pressure side of the energy exchange device, and an outlet of the high-pressure side communicates with 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 the field of water treatment, especially in the field of industrial water treatment. Membrane bioreactors have the advantages of strong impact resistance, ability to retain all microorganisms in the reaction tank, and no sludge loss in the sedimentation tank. However, organic compounds in sewage can pollute the filter membrane of the membrane bioreactor, thereby affecting the stable operation of the membrane bioreactor and increasing the operating cost of the equipment.

[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 a variety of organic and inorganic substances in the sewage, achieve the decomposition of pollutants, and thus reduce the pollution of organic matter to the membrane bioreactor. 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 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 reduction effect of combining ozone with a membrane pool. Summary of the invention

[0004] In order to solve at least one of the above-mentioned 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 to be 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. A membrane group is provided in the membrane pool; the water outlet of the membrane group 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 is arranged in the ozone reaction pool, the second aerator is arranged in the membrane pool, and the ozone generator is 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 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.

[0006] In certain embodiments of the first aspect of the present application, the exhaust gas utilization component further includes a steam-water separation device, and the steam-water separation device 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 comprises a pressure reducing valve, which is disposed between an air inlet of the ozone generator and an outlet of 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, and 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 comprises a plurality of the venting grooves, and the plurality of the venting 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 is disposed at the gas outlet of the spiral releaser, the inner wall of the diffuser is provided with a gas runway, and the gas runway is used for ozone diffusion.

[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 reflux 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 introduced 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] Passing ozone generated by the ozone generator 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 achieve 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, thereby 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 easy to understand 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 cannot be understood as limiting the present application.

[0025] Figure 1 A schematic diagram of an example of the structure 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 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 groove; 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] Combine the following 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 cannot be understood as limiting the present application.

[0031] In the description of the present 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 drawings, which is only for the convenience of describing the present 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 the present application. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, "multiple" means two or more.

[0032] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0033] First, see Figure 1The present application provides an ozone tail gas membrane pool release system 100, comprising a membrane pool 10, an ozone reaction pool 20, an ozone generating assembly 30 and a tail gas utilization assembly 40. A membrane module 11 is provided in the membrane pool 10, and a water outlet of the membrane module 11 is connected to the ozone reaction pool 20, and the ozone reaction pool 20 is 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 arranged in the ozone reaction pool 20, the second aerator 34 is arranged in the membrane pool 10, and the ozone generator 32 is connected to the first aerator 33 to provide ozone to the ozone reaction pool 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 of 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 exhaust 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 exhaust 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, thereby further saving the cost required for pressurizing the ozone exhaust gas. The pressurized ozone tail gas can be introduced 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 group 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 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 wasteful. 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] Exemplarily, the energy exchange device 41 uses the pressure turbine principle for energy recovery. That is, high-pressure liquid oxygen enters the energy exchange device, and the pressure energy is converted into mechanical energy through the impeller. The impeller drives the shaft to rotate, and the other end of the shaft is connected to another impeller, which can pressurize the low-pressure ozone tail gas, thereby forming a conversion from pressure energy to mechanical energy to pressure energy. Other structures and operations of the energy exchange device 41 have been recorded in the relevant technology for ordinary technicians in this field, and will not be described in detail here.

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

[0038] In some embodiments, the tail gas utilization component 40 further includes a steam-water separation device 42, which is disposed between the tail gas outlet 21 and the inlet of the low-pressure side 412 of the energy exchange device 41. The steam-water separation device 42 can reduce the water vapor content in the ozone tail gas and remove the liquid water overflowed with bubbles in the ozone reaction tank 20, thereby preventing large-scale condensation of water vapor in the pipeline, thereby reducing the efficiency of the energy exchange device 41 and even blocking the energy exchange device 41. Exemplarily, the steam-water separation device 42 is a steam-water separation 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 pool 20, at which time the ozone reaction pool 20 has not yet produced ozone tail gas, and at which time there is no low pressure ozone tail gas introduced into the low pressure side 412 of the energy exchange device 41, so 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 a suitable pressure level, a pressure reducing valve 35 is disposed upstream of the ozone generator 32, and 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 enabled, so as to reduce 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 understandable that when enough ozone tail gas has been generated in the ozone reaction tank 20 and the energy exchange device 41 has been enabled, 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 may not be enabled. Of course, in other examples, in order to ensure that the pressure of the supply gas entering the ozone generator 32 is low enough and stable enough, the pressure reducing valve 35 may also be enabled when the energy exchange device 41 has been enabled, which is not limited here.

[0040] In some embodiments, the ozone generating assembly 30 further includes a stop 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 the stop valve 36 is disposed in parallel with the pressure reducing valve 35. The stop valve 36 can 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 stop valve 36 is closed to prevent the gas supply in the high pressure gas supply pipe from entering the ozone generator 32, so that the ozone generator 32 stops generating ozone, and accordingly, stops generating ozone tail gas, thereby realizing the operation of shutting down 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 stop valve 36 to control the high-pressure oxygen supply pipe 31 to selectively connect to the stop valve 36 or the pressure reducing valve 35. The flow control valve 37 can be used to control whether the high-pressure ventilation pipe is selectively connected to the branch where the stop valve 36 or the pressure reducing valve 35 is located, thereby realizing the closing or enabling operation of the entire ozone tail gas membrane pool release system 100.

[0042] In some embodiments, see Figure 3, the 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, and the releaser includes a ventilation groove 341 and a plurality of spiral releasers 342, and the plurality of spiral releasers 342 are arranged at intervals along the length direction of the ventilation groove 341. By using the releaser, the ozone tail gas in the pipeline can be released into the membrane pool 10, so that the ozone tail gas can 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 to reduce the system membrane pollution potential, thereby reducing membrane pollution. 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 plurality of aeration holes set on the surface of the pipeline. By setting the pipeline in the membrane pool 10, the ozone tail gas is pressurized by the energy exchange device 41 to achieve sufficient aeration pressure, and the ozone tail gas can be released through the aeration holes in the membrane pool 10 to achieve the recycling of the ozone tail gas.

[0043] In some embodiments, the releaser includes a plurality of ventilation grooves 341, and the plurality of ventilation grooves 341 are arranged in an array at the bottom of the membrane module 11. By providing a plurality of ventilation grooves 341, the aeration area can be increased so that the outlet position of the ozone tail gas corresponds to the membrane module 11, the movement distance of the ozone tail gas is shortened, and the contact effect between the ozone tail gas and the membrane surface, sludge, and sewage is improved, thereby improving the reaction efficiency of the ozone tail gas and pollutants.

[0044] In some embodiments, the second aerator 34 also includes a diffuser, and the diffuser cover is arranged at the air outlet of the spiral releaser 342, and the inner wall of the diffuser is provided with a gas runway, and the gas runway is used for ozone diffusion. Using the diffuser, on the one hand, the ozone tail gas can be further decomposed into smaller bubbles, further increasing the contact area between the ozone tail gas and the pollutants, and through the mixed flow and disturbance of the membrane filaments in the membrane group 11, the effect of full reaction of ozone and sludge is achieved, thereby improving the reaction efficiency of ozone and sludge, and improving the decomposition effect of ozone on pollutants. On the other hand, the use of the diffuser can drive the ozone tail gas and the activated sludge to be further mixed in the spiral rise, diffuse into the activated sludge in the membrane pool 10 through the holes above the diffuser, and the activated sludge is replenished into the diffuser through the bottom space of the diffuser. The ozone tail gas contacts the membrane group 11 and is dispersed into the membrane filaments. With the capillary adsorption between the membrane filaments, the residence time of ozone in the membrane pool 10 is extended, thereby improving the ozone utilization efficiency and avoiding the safety problems caused by ozone overflowing the membrane pool 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 also includes a biochemical pool 50 and a reflux pump. The biochemical pool 50 is arranged upstream of the membrane pool 10 and 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, and the filtered water separated by the membrane group 11 can enter the ozone reaction pool 20 for reaction, and the sludge is received 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 introduced into the biochemical pool 50, and the activated sludge in the biochemical pool 50 is used to fully react and decompose with the sewage. The mixed solution of sewage and sludge is introduced into the membrane pool 10, and the membrane module 11 in the membrane pool 10 is used to filter and separate the sludge and water. The filtered water obtained after filtration is collected through the water outlet of the membrane module 11 and introduced into the ozone reaction pool 20. The first aerator 33 in the ozone reaction pool 20 releases ozone, and the ozone is mixed with the filtered water in the ozone reaction pool 20 and reacts. The catalytic oxidation of ozone on sewage is used to further purify the sewage, and the purified water is discharged to the next level of treatment system.

[0048] At the same time, the high-pressure oxygen supply pipe 31 provides the supply gas (high-pressure liquid oxygen), and the high-pressure liquid oxygen enters the high-pressure side 411 of the energy exchange device 41 to be decompressed, and the decompressed supply gas enters the ozone generator 32 to generate ozone, and the generated ozone is 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 the ozone tail gas is passed into the low-pressure side 412 of the energy exchange device 41, and the pressure of the high-pressure liquid oxygen is used to increase the pressure, so that the ozone tail gas is increased to a suitable pressure, and is passed into the second aerator 34 to provide ozone to the membrane tank 10, so that the ozone tail gas of the ozone reaction tank 20 is 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 to 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 tail 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, so that the energy of the high-pressure side 411 is exchanged to the low-pressure side 412 in the energy exchange device 41, so as to achieve 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 understandable that the above steps S3 and S4 can be performed simultaneously, or step S4 can be performed before step S3. The decompressed supply gas enters the ozone generator 32, while the pressurized ozone tail gas enters the second aerator 34 to achieve aeration in the membrane pool 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 in 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 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. By making full use of 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] By using the pressure reducing valve 35 to reduce the pressure of the supply gas in the high-pressure oxygen supply pipe 31 , it is possible to reduce the pressure of the supply gas before the energy exchange device 41 is activated, thereby ensuring that the gas entering the ozone generator 32 meets the receiving air 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 representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[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 knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present application.

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

Claims

1. An ozone tail gas membrane pool release system, characterized in that: 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 a tail 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 arranged in the ozone reaction tank, the second aerator is arranged in the membrane tank, and the ozone generator is connected to the first aerator to provide ozone to the ozone reaction tank; The tail gas utilization component includes an energy exchange device, 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.

2. The ozone tail gas membrane pool release system according to claim 1 is characterized in that: The tail gas utilization component also 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.

3. The ozone tail gas membrane pool release system according to claim 1 is characterized in that: 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.

4. The ozone tail gas membrane pool release system according to claim 3 is characterized in that: 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.

5. The ozone tail gas membrane pool release system according to any one of claims 1 to 4, characterized in that: The second aerator includes a releaser, which is arranged at the bottom of the membrane module to release ozone to 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.

6. The ozone tail gas membrane pool release system according to claim 5 is characterized in that: The releaser comprises a plurality of vent grooves, and the plurality of vent grooves are arranged in an array at the bottom of the membrane module.

7. The ozone tail gas membrane pool release system according to claim 5 is characterized in that: The second aerator also includes a diffuser, and the diffuser cover is arranged at the air outlet of the spiral releaser. The inner wall of the diffuser is provided with a gas runway, and the gas runway is used for ozone diffusion.

8. The ozone tail gas membrane pool release system according to any one of claims 1 to 4, 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 reflux the mixed liquid in the membrane pool to the biochemical pool.

9. A method for utilizing ozone tail gas, 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 introduced 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; and the ozone tail gas in the ozone reaction tank is collected.

10. The ozone tail gas utilization method according to claim 9, characterized in that: Before the energy exchange device is turned on, the ozone tail gas utilization method further includes switching the flow path control valve so that the high-pressure oxygen supply pipe is connected 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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