Device with built-in aerator and ozone in water treatment membrane module and membrane pollution removal method

Abstract

The invention discloses a water treatment membrane assembly built-in aeration and ozone device and a membrane pollution removal method, and relates to the technical field of water treatment.The device comprises an air compressor, an ozone generator, an air electromagnetic valve, an ozone electromagnetic valve, an air pressure regulating valve, an ozone pressure regulating valve, a plurality of air inlet branch pipes, a water production pipe, a water production electromagnetic valve and a membrane assembly; the membrane component comprises a plurality of ceramic membranes; one side of each ceramic membrane of the membrane component is connected with a water producing pipe which is provided with a water producing electromagnetic valve, and the other side of each ceramic membrane is connected with an air inlet branch pipe; the air inlet branch pipe is formed by converging an air inlet branch pipe and an ozone inlet branch pipe; an air electromagnetic valve and an air pressure regulator are arranged on the air inlet branch pipe; the air compressor is connected with one side of the air pressure regulator; an ozone electromagnetic valve and an ozone pressure regulating valve are arranged on the ozone inlet branch pipe; and the ozone generator is connected with one side of the ozone pressure regulating valve. The device has an aeration hole function and a membrane pollution control function.

Description

Technical Field

[0001] The present application relates to the technical field of water treatment, and particularly to a device for internally aerating and ozonating a water treatment membrane module and a method for removing membrane fouling. Background Art

[0002] The membrane technology has the advantages of high pollutant removal efficiency, good effluent quality, low sludge production rate, small floor area, etc.; the ozone oxidation technology has the characteristics of high oxidation efficiency, cleanliness, and no secondary pollution; based on the excellent chemical stability of ceramic membrane sheets, ozone can alleviate membrane fouling to a certain extent without affecting the use and lifespan of the membrane. Therefore, the ozone / ceramic membrane sheet combined process has been widely studied and applied in water treatment fields such as urban domestic sewage and industrial wastewater treatment.

[0003] However, the ozone / ceramic membrane sheet combined process also has several problems that cannot be ignored, which seriously restrict the wide application of the membrane water treatment process. 1) Membrane fouling problem. On the one hand, in the membrane pool, pollutants directly interact with the membrane module, attaching to the membrane surface or inside the membrane pores, causing membrane fouling. Ozone enters the membrane pool through the aeration device and is extremely likely to chemically react with pollutants in the solution. Therefore, the amount of ozone acting on the membrane surface and inside the membrane pores is small, and the utilization rate of ozone for removing membrane fouling is low. On the other hand, a large number of air bubbles generated by the aeration device can scrape the membrane surface to slow down part of the membrane fouling, but the bubbles quickly diffuse in water, and there is also a problem of low utilization rate for removing membrane fouling, and it cannot deal with membrane pollutants inside the membrane pores. Membrane fouling reduces the effluent efficiency of the membrane, increases the transmembrane pressure difference, thereby increasing energy consumption, and at the same time reduces the service life of the membrane and increases the operation cost such as membrane cleaning. 2) Aeration device blockage problem. The aeration device in the membrane water treatment process is usually placed at the bottom of the pool, and the air holes of the aeration pipe or aeration disc are extremely likely to be blocked by pollutants in the reaction pool, resulting in uneven and insufficient aeration volume, reducing the aeration efficiency, and increasing the cleaning frequency of the aeration device, greatly increasing the energy consumption of the process. Summary of the Invention

[0004] The purpose of the present application is to provide a device for internally aerating and ozonating a water treatment membrane module and a method for removing membrane fouling. This device can deliver air and ozone into the ceramic membrane sheet, not only realizing the physical cleaning and chemical cleaning of the membrane pores and membrane surface by the gas, but also the membrane pores of the ceramic membrane sheet simultaneously serve as the air holes of the aeration device, replacing the setting of the traditional aeration device.

[0005] To achieve the above purpose, the present application provides the following solutions:

[0006] In the first aspect, the present application provides a device for internally aerating and ozonating a water treatment membrane module, and the device includes:

[0007] An air compressor, an ozone generator, an air solenoid valve, an ozone solenoid valve, an air pressure regulating valve, an ozone pressure regulating valve, a plurality of intake branch pipes, a water production pipe, a water production solenoid valve, and a membrane module; the membrane module includes a plurality of ceramic membrane sheets; one side of each ceramic membrane sheet of the membrane module is connected to the water production pipe, and a water production solenoid valve is arranged on the water production pipe, and the other side is connected to the intake branch pipe, and the intake branch pipe is formed by the confluence of an air intake branch pipe and an ozone intake branch pipe; the air solenoid valve and the air pressure regulating valve are arranged on the air intake branch pipe, and the air compressor is connected to one side of the air pressure regulating valve; the ozone solenoid valve and the ozone pressure regulating valve are arranged on the ozone intake branch pipe; the ozone generator is connected to one side of the ozone pressure regulating valve.

[0008] Optionally, the air solenoid valve and the air pressure regulating valve on each air intake branch pipe correspondingly control each ceramic membrane sheet connected to the air intake branch pipe.

[0009] Optionally, the ozone solenoid valve and the ozone pressure regulating valve on each ozone intake branch pipe correspondingly control each ceramic membrane sheet connected to the ozone intake branch pipe.

[0010] Optionally, the maximum internal gas pressure that the air solenoid valve, the ozone solenoid valve, the air pressure regulating valve, the ozone pressure regulating valve, the intake branch pipe, the water production pipe, the water production solenoid valve, and the membrane module can withstand is 1.25 Mpa.

[0011] Optionally, the pore diameter range of the ceramic membrane sheet is from nanometer level to micrometer level.

[0012] Optionally, air or ozone enters the ceramic membrane sheet through the air intake branch pipe or the ozone intake branch pipe under a set air pressure, and diffuses into the solution of the membrane bioreactor through the membrane pores of the ceramic membrane sheet, generating air bubbles or ozone bubbles from nanometer level to micrometer level.

[0013] Optionally, the minimum distance between the ceramic membrane sheets in the membrane module is 5 mm.

[0014] In a second aspect, the present application provides a method for removing membrane fouling of a device with built-in aeration and ozone in the water treatment membrane module, and the method for removing membrane fouling includes:

[0015] Controlling the air compressor to generate high-pressure gas;

[0016] Controlling the ozone generator to generate ozone gas;

[0017] During the air aeration process, control the high-pressure gas to enter the ceramic diaphragm through the air pressure regulating valve, air solenoid valve, and air inlet branch pipe, and generate air bubbles with a size ranging from nanometers to micrometers through the membrane pores of the ceramic diaphragm, which diffuse into the solution of the membrane bioreactor; the air aeration process is achieved by setting the pressure of the air pressure regulating valve and the aeration duration.

[0018] During the ozone oxidation process, control the ozone gas to enter the ceramic diaphragm through the ozone pressure regulating valve, ozone solenoid valve, and ozone inlet branch pipe, and generate ozone bubbles with a size ranging from nanometers to micrometers through the membrane pores of the ceramic diaphragm, which diffuse into the solution of the membrane bioreactor; the ozone gas is used to oxidize the membrane pollutants on the membrane pores and membrane surface of the ceramic diaphragm; the ozone oxidation process is achieved by setting the pressure of the ozone pressure regulating valve and the ozone oxidation duration.

[0019] Optionally, during the air aeration process, control the high-pressure gas to enter the ceramic diaphragm through the air pressure regulating valve, air solenoid valve, and air inlet branch pipe, and generate air bubbles with a size ranging from nanometers to micrometers through the membrane pores of the ceramic diaphragm, which diffuse into the solution of the membrane bioreactor. Specifically, it includes:

[0020] Real-time measure the dissolved oxygen concentration in the solution of the membrane bioreactor through an on-line dissolved oxygen meter.

[0021] When the measured dissolved oxygen concentration is lower than the set range, increase the aeration pressure or extend the aeration duration.

[0022] When the measured dissolved oxygen concentration is higher than the set range, decrease the aeration pressure or shorten the aeration duration.

[0023] When the measured dissolved oxygen concentration is within the set range, maintain the current aeration pressure.

[0024] Optionally, during the ozone oxidation process, control the ozone gas to enter the ceramic diaphragm through the ozone pressure regulating valve, ozone solenoid valve, and ozone inlet branch pipe, and generate ozone bubbles with a size ranging from nanometers to micrometers through the membrane pores of the ceramic diaphragm, which diffuse into the solution of the membrane bioreactor. Specifically, it includes:

[0025] Real-time measure the ozone concentration in the solution of the membrane bioreactor through an on-line ozone concentration detector.

[0026] When the monitored transmembrane pressure difference is lower than the set range, start the ozone oxidation process and measure the ozone concentration in the solution; increase the ozone pressure or extend the ozone generator startup duration.

[0027] When the ozone concentration in the membrane bioreactor is lower than the set range, increase the ozone pressure or extend the ozone oxidation duration.

[0028] When the ozone concentration in the membrane bioreactor is within the set range, the set ozone pressure is maintained. After a certain period of time, the ozone oxidation process is terminated.

[0029] According to the specific embodiments provided in this application, the following technical effects are disclosed in this application:

[0030] This application provides a device for internal aeration and ozone in a water treatment membrane module and a method for removing membrane fouling. In this device, raw water is transmitted from the outside of the ceramic membrane sheet to the inside of the membrane through the membrane pores and produces water through the water production pipe. The ceramic membrane sheet has the characteristics of good stability, strong oxidation resistance, and high pressure resistance. As the core component of water treatment, it can ensure the permeability of the ceramic membrane sheet and maintain a stable transmembrane pressure difference through periodic and ozone cleaning under specific conditions. Among them, introducing ozone gas from inside the membrane increases the residence time of ozone inside the membrane and reduces the ozone mass transfer space, improving the mass transfer efficiency. Moreover, the ozone gas can directly act on the pollutants inside the membrane pores and on the membrane surface, improving the oxidation and degradation efficiency of ozone, achieving deep chemical cleaning of membrane pollutants, and thus effectively removing the irreversible fouling of the membrane. This device can improve the physical and chemical removal effects of membrane fouling, and at the same time effectively avoid the problems of blocked aeration holes, uneven aeration, low mass transfer efficiency, high energy consumption, and poor membrane fouling control effect that may be brought about by independently setting an aeration device. Description of the Drawings

[0031] In order to more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0032] Figure 1 It is an axonometric schematic diagram of a device for internal aeration and ozone in a water treatment membrane module provided in Embodiment 1 of this application.

[0033] Figure 2 It is a side view of a single membrane provided in Embodiment 1 of this application.

[0034] Figure 3 It is an electrical diagram of a device for internal aeration and ozone in a water treatment membrane module provided in Embodiment 1 of this application.

[0035] Symbol Explanation:

[0036] Membrane module - 1, ceramic membrane sheet - 2, water production pipe - 3, water production solenoid valve group - 4, water production solenoid valve - 5 corresponding to each single membrane in the water production solenoid valve group 4, water production main pipe - 6, water production pressure sensor - 7, water production water quality self - inspection sensor - 8, water production pipeline pump - 9, air inlet branch pipe - 10, ozone inlet branch pipe - 11, ozone solenoid valve group - 12, ozone solenoid valve - 13 corresponding to each single membrane in the ozone solenoid valve group 12, ozone inlet main pipe - 14, ozone pressure regulating valve - 15, ozone generator - 16, air inlet branch pipe - 17, air solenoid valve group - 18, air solenoid valve - 19 corresponding to each single membrane in the air solenoid valve group 18, air inlet main pipe - 20, air pressure regulating valve - 21, air compressor - 22, water backwashing inlet branch pipe - 23, water backwashing solenoid valve group - 24, water backwashing solenoid valve - 25 corresponding to each single membrane in the water backwashing solenoid valve group 24, water backwashing inlet main pipe - 26, water backwashing pressure sensor - 27, water backwashing water quality self - inspection sensor - 28, water backwashing pipeline pump - 29, membrane tank - 30, dissolved oxygen meter - 31, ozone concentration detector - 32, control cabinet - 33, power supply cabinet - 34. Detailed implementation mode

[0037] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0038] In order to make the above - mentioned objects, features, and advantages of the present application more obvious and understandable, the present application will be further described in detail below in conjunction with the drawings and specific implementation modes.

[0039] Embodiment 1

[0040] As Figures 1 - 3 shown, this embodiment provides a device for internal aeration and ozone in a water treatment membrane module, including:

[0041] An air compressor 22, an ozone generator 16, an air solenoid valve 19, an ozone solenoid valve 13, an air pressure regulating valve 21, an ozone pressure regulating valve 15, a plurality of intake branch pipes 10, a water production pipe, a water production solenoid valve 5 and a membrane module 1; the membrane module 1 includes a plurality of ceramic membrane sheets 2; one side of each ceramic membrane sheet 2 of the membrane module 1 is connected to a water production branch pipe 3, and a water production solenoid valve 5 is arranged on the water production branch pipe 3, and a plurality of water production solenoid valves 5 form a water production solenoid valve group 4. A plurality of water production branch pipes 3 converge to form a water production main pipe 6, and a water production pressure sensor 7, a water production water quality self-check sensor 8, and a water production pipeline pump 9 are sequentially arranged on the water production main pipe 6. The other side below of the ceramic membrane sheet 2 is connected to an intake branch pipe 10, and the intake branch pipe 10 is formed by the confluence of an air intake branch pipe 17 and an ozone intake branch pipe 11; an ozone solenoid valve 13 is arranged on the ozone intake branch pipe 11, and a plurality of ozone solenoid valves 13 form an ozone solenoid valve group 12, a plurality of ozone intake branch pipes 11 converge to form an ozone intake main pipe 14, and an ozone pressure regulator and an ozone generator 16 are sequentially arranged on the ozone intake main pipe 14; an air solenoid valve 19 is arranged on the air intake branch pipe 17, a plurality of air solenoid valves 19 form an air solenoid valve group 18, a plurality of air intake branch pipes 17 converge to form an air intake main pipe 20, and an air pressure regulating valve 21 and an air compressor 22 are arranged on the air intake main pipe 20. The other side above of the ceramic membrane sheet 2 is connected to a water backwash intake branch pipe 23, a water backwash solenoid valve 25 is arranged on the water backwash intake branch pipe 23, a plurality of water backwash solenoid valves 25 form a water backwash solenoid valve group 24, a plurality of water backwash intake branch pipes 23 converge to form a water backwash intake main pipe 26, and a water backwash pressure sensor 27, a water backwash water quality self-check sensor 28 and a water backwash pipeline pump 29 are arranged on the water backwash intake main pipe 26.

[0042] Among them, when air aeration is performed on a plurality of ceramic membrane sheets 2, the air compressor 22 is used to generate high-pressure gas with a certain pressure. The high-pressure gas enters the air intake main pipe 20, and after flowing through the gas is regulated to the set pressure by the air pressure regulating valve 21, it enters a plurality of air intake branch pipes 17. The opening and closing of the air solenoid valve 19 on the air intake branch pipe 17 determines whether air enters the interior of the corresponding ceramic membrane sheet 2. Under a certain air pressure, the gas diffuses into the membrane bioreactor through the membrane pores (the pore diameter range is from nanometers to micrometers) of the ceramic membrane sheet 2.

[0043] Among them, when ozone oxidation is used to remove membrane fouling from the ceramic membrane sheet 2, the ozone generated by the ozone generator 16 enters the ozone intake main pipe 14, and after flowing through the ozone is regulated to the set pressure by the ozone pressure regulating valve 15, it enters a plurality of ozone intake branch pipes 11. The opening and closing of the ozone solenoid valve 13 on the ozone intake branch pipe 11 determines whether ozone enters the interior of the corresponding ceramic membrane sheet 2. Under a certain air pressure, the ozone diffuses into the membrane bioreactor through the membrane pores (the pore diameter range is from nanometers to micrometers) of the ceramic membrane sheet 2.

[0044] Among them, when filtering and producing water from the ceramic membrane sheet 2, the water production pipeline pump 9 is started. A number of single-piece ceramic membrane sheets 2 corresponding to the water production solenoid valves 5 in the open state in the water production solenoid valve group 4 are in a negative pressure state. The raw water in the membrane tank enters the interior of the membrane through the membrane pores under the action of pressure, and the pollutants are intercepted on the membrane surface and in the membrane pores. The purified water after membrane filtration flows out through the water production pipe, converges to the water production main pipe 6, and flows out after being detected by the water production water quality self-checking sensor 8 on the water production main pipe 6.

[0045] Among them, when performing water backwashing on the ceramic membrane sheet 2, the water production solenoid valves 5 of a number of ceramic membrane sheets 2 are closed, and the water backwashing solenoid valves 25 and the water backwashing pipeline pump 29 of these ceramic membrane sheets 2 are opened. The cleaning water enters the water backwashing main pipe from the pipeline pump, and enters the water backwashing inlet branch pipe 23 through a number of water backwashing solenoid valves 25 in the open state, then enters the interior of the corresponding ceramic membrane sheet 2, and enters the reactor through the membrane pores. This process can remove some pollutants inside the membrane and in the membrane pores.

[0046] In this embodiment, each air solenoid valve 19 correspondingly controls each ceramic membrane sheet 2 connected to the air inlet branch pipe 17; each ozone solenoid valve 13 correspondingly controls each ceramic membrane sheet 2 connected to the ozone inlet branch pipe 11. The pore size range of the ceramic membrane sheet 2 is from the nanometer level to the micrometer level. The air or ozone entering the membrane can generate nanometer-level to micrometer-level air bubbles or ozone bubbles through the ceramic membrane sheet 2 under a certain air pressure. As Figure 1 shown, the minimum distance between the ceramic membrane sheets 2 in the membrane module 1 is 5 mm.

[0047] In this embodiment, the maximum internal gas pressure borne by the device with the aeration and ozone device built in the water treatment membrane module is 1.25 Mpa. For example, the maximum gas pressure borne by the membrane module 1, the water production solenoid valve group 4, the air solenoid valve group 18, the ozone solenoid valve group 12, the water backwashing solenoid valve group 24, and all the main pipes and branch pipes in the device is 1.25 Mpa.

[0048] In this embodiment, precise control of each air or ozone inlet branch is considered. A dedicated air solenoid valve 19 or ozone solenoid valve 13 is installed on each such branch. These solenoid valves are designed to be able to precisely control the ceramic membrane sheet 2 connected to it. These ceramic membrane sheets 2 have a unique pore size structure, and its size can range from the nanometer level to the micrometer level. Such a design enables both air and ozone to generate corresponding-sized air bubbles or ozone bubbles in the solution of the membrane bioreactor through the membrane pores of the ceramic membrane sheet 2 under certain air pressure conditions. Therefore, the pore size of the ceramic membrane sheet can be designed according to the requirements for bubble size in different application scenarios to meet the actual needs.

[0049] Just as Figure 1As shown, they are arranged in parallel between the respective ceramic membranes 2 in the membrane module 1. In the traditional flat-plate ceramic membrane method for water treatment, the aeration system is at the bottom or side of the ceramic membranes 2. The spacing between the ceramic membranes 2 is usually 60 - 80 mm. If the spacing is too low, it will cause poor air flow during flushing. In the present invention, aeration can be generated by the ceramic membranes 2. Therefore, the minimum distance between the ceramic membranes 2 can be set to 50 mm. Such a distance setting can not only increase the number of ceramic membranes 2 per unit area and improve the water treatment efficiency, but also ensure the stability of gas flow.

[0050] In addition, the maximum internal gas pressure set for the membrane module and other components involved in this embodiment is 1.25 MPa. On the one hand, the advantage of the ceramic membrane 2 over the organic membrane is its high mechanical strength and pressure resistance. Therefore, the setting of high pressure has no effect on the performance of the ceramic membrane 2. On the other hand, the setting of high pressure can increase gas disturbance and friction, which is beneficial to removing membrane contaminants and is also beneficial to the formation of microbubbles when gas permeates through the membrane pores into the solution. The setting of this pressure value also provides the possibility of expanding the applicable range of the system.

[0051] Among them, in this embodiment, in different situations, the switching states of the solenoid valves are as follows:

[0052] As Figures 1 - 3 shown, when several ceramic membranes 2 are subjected to water backwashing: the water production solenoid valves 5 corresponding to these ceramic membranes 2 are in the closed state, the water backwashing pipeline pump 29 is turned on and in the water inlet state, the water backwashing solenoid valves 25 corresponding to the above-mentioned ceramic membranes 2 in the water backwashing solenoid valve group 24 are in the open state (other solenoid valves in this solenoid valve group are in the closed state), and the air solenoid valves 19 and ozone solenoid valves 13 corresponding to the above-mentioned ceramic membranes 2 are in the closed state.

[0053] When several ceramic membranes 2 are subjected to ozone for membrane contamination removal: the water production solenoid valves 5 corresponding to these ceramic membranes 2 are in the closed state, the ozone generator 16 is turned on and generates ozone, the ozone solenoid valves 13 corresponding to the above-mentioned ceramic membranes 2 in the ozone solenoid valve group 12 are in the open state (other solenoid valves in this solenoid valve group are in the closed state), and the water backwashing solenoid valves 25 and air solenoid valves 19 corresponding to the above-mentioned ceramic membranes 2 are in the closed state.

[0054] When several ceramic membranes 2 are aerated: the water production solenoid valves 5 corresponding to these ceramic membranes 2 are in the closed state, the air compressor 22 is turned on and generates compressed air, the air solenoid valves 19 corresponding to the above-mentioned ceramic membranes 2 in the air solenoid valve group 18 are in the open state (other solenoid valves in this solenoid valve group are in the closed state), and the water backwashing solenoid valves 25 and ozone solenoid valves 13 corresponding to the above-mentioned ceramic membranes are in the closed state.

[0055] When performing combined air and water backwashing on several ceramic membranes 2: The water production solenoid valves 5 corresponding to these ceramic membrane sheets 2 are in the closed state, the air compressor 22 is in the open state and generates compressed air, the water backwashing pipeline pump 29 is opened and in the water inlet state, the water backwashing solenoid valves 25 and the air solenoid valves 19 corresponding to the above-mentioned ceramic membrane sheets 2 are in the open state, and the ozone solenoid valve 13 corresponding to the above-mentioned ceramic membrane sheets 2 is in the closed state.

[0056] When several ceramic membrane sheets 2 produce water: The water production solenoid valves 5 corresponding to these ceramic membrane sheets 2 are in the open state and produce water, and the water backwashing solenoid valve 25, the air solenoid valve 19 and the ozone solenoid valve 13 corresponding to the above-mentioned ceramic membrane sheets 2 are in the closed state.

[0057] Among them, the power cabinet 34 is used to provide power support for the entire device, including the operation of equipment such as the air compressor 22, the ozone generator 16, each solenoid valve, and the pipeline pump. The control cabinet 33 is used to control the operating state of the entire device, including but not limited to starting, stopping, monitoring, and adjusting the work of each component.

[0058] Embodiment 2

[0059] As Figures 1 - 3 shown, this embodiment provides a method for removing membrane fouling of a device with built-in aeration and ozone in a water treatment membrane module according to any one of the above, and the method for removing membrane fouling includes:

[0060] Control the air compressor 22 to generate high-pressure gas;

[0061] Control the ozone generator 16 to generate ozone gas;

[0062] During the air aeration process, control the high-pressure gas to enter the ceramic membrane sheet 2 through the air pressure regulating valve 21, the air solenoid valve 19, and the air inlet branch pipe 17, and generate nano-scale to micron-scale air bubbles through the membrane pores of the ceramic membrane sheet 2, and diffuse into the solution of the membrane bioreactor; the high-pressure gas is used to scour the contaminants in the membrane pores and on the membrane surface of the ceramic membrane sheet 2; the air bubbles diffused into the solution provide dissolved oxygen for the solution on the one hand, and on the other hand, a large number of bubbles can stir and mix the water body. At the same time, a large number of air bubbles generated can increase the dissolved oxygen concentration in the solution and play a role in stirring the solution; the air aeration process is achieved by setting the pressure of the air pressure regulating valve 21 and the set aeration duration.

[0063] During the ozone oxidation process, control the ozone gas to enter the ceramic diaphragm 2 through the ozone pressure regulating valve 15, the ozone solenoid valve 13, and the ozone inlet branch pipe 11, and generate nano-scale to micron-scale ozone bubbles through the membrane pores of the ceramic diaphragm 2, which diffuse into the solution of the membrane bioreactor; the ozone gas is used to oxidize the pollutants on the membrane pores and the membrane surface of the ceramic diaphragm 2; the ozone oxidation process is achieved by setting the pressure of the ozone pressure regulating valve 15 and setting the ozone oxidation duration. After the ozone oxidation is completed, then introduce the above-mentioned high-pressure gas with a certain pressure and duration into the membrane to fully diffuse the ozone gas in the membrane into the solution.

[0064] Among them, in this embodiment, during the air aeration process, control the high-pressure gas to enter the ceramic diaphragm 2 through the air pressure regulating valve 21, the air solenoid valve 19, and the air inlet branch pipe 17, and generate nano-scale to micron-scale air bubbles through the membrane pores of the ceramic diaphragm 2, which diffuse into the solution of the membrane bioreactor, specifically including:

[0065] Real-time measure the dissolved oxygen concentration in the solution of the membrane pool 30 through the on-line dissolved oxygen meter 31;

[0066] When the measured dissolved oxygen concentration is lower than the set range, increase the aeration pressure or extend the aeration duration;

[0067] When the measured dissolved oxygen concentration is higher than the set range, reduce the aeration pressure or shorten the aeration duration;

[0068] When the measured dissolved oxygen concentration is within the set range, maintain the current aeration pressure.

[0069] Among them, in this embodiment, during the ozone oxidation process, control the ozone gas to enter the ceramic diaphragm 2 through the ozone pressure regulating valve 15, the ozone solenoid valve 13, and the ozone inlet branch pipe 11, and generate nano-scale to micron-scale ozone bubbles through the membrane pores of the ceramic diaphragm 2, which diffuse into the membrane pool 30, specifically including:

[0070] When performing ozone oxidation of membrane pollutants periodically or under specific conditions (such as when the monitored transmembrane pressure difference is lower than the set range and membrane fouling needs to be reduced), start the ozone generator, set the ozone pressure, and open several ozone solenoid valves corresponding to several single membranes that need to be cleaned by ozone oxidation. At the same time, obtain the ozone concentration in the solution in real time through the ozone concentration meter 32;

[0071] When the monitored ozone concentration is lower than the set range, increase the ozone pressure or extend the ozone oxidation duration;

[0072] When the monitored ozone concentration is higher than the set range, reduce the ozone pressure or shorten the ozone oxidation duration;

[0073] However, if the monitored ozone concentration is within the set range, the current aeration pressure is maintained. After a certain period of time, the ozone oxidation process is terminated.

[0074] The ozone concentration in the solution of the membrane tank 30 is measured in real time by an on-line ozone concentration detector 32.

[0075] When the monitored transmembrane pressure difference of the membrane is lower than the set range, the ozone oxidation process is started, and the ozone pressure range and the start-up duration of the ozone generator 16 are set.

[0076] When the ozone concentration in the membrane bioreactor reaches the established range, after maintaining the set ozone pressure and set time, the ozone oxidation process is terminated.

[0077] In summary, the present invention has the following technical effects:

[0078] 1) By introducing air into the ceramic membrane sheet 2, under the action of pressure, the raw water is transmitted from outside the membrane to inside the membrane through the membrane pores. During this process, pollutants are likely to accumulate on the membrane surface and in the membrane pores. The aeration operation from inside the membrane, that is, the gas is transmitted from inside the ceramic membrane sheet 2 to outside the membrane through the pipelines in the membrane pores under the set pressure, not only can effectively wash away the pollutants in the membrane pores and on the membrane surface, but also provides the necessary dissolved oxygen for the membrane tank and promotes the mixing of the solution. Compared with the organic membrane module, the ceramic membrane sheet 2 shows higher stability, antioxidant property and high-pressure resistance. In addition, different from the traditional process of setting an independent aeration device in the membrane tank, this innovation uses the ceramic membrane sheet 2 itself as the main component of the aeration device and water treatment. Through frequent air-water backwashing and chemical cleaning, the stability of the transmembrane pressure difference of the membrane module 1 is maintained, and the permeability of the membrane pore diameter is ensured. This design not only avoids the problems such as pore blockage, high aeration energy consumption and uneven aeration that may be caused by the independent aeration device, but also eliminates the work of additional cleaning of the aeration device, achieving the dual effects of energy conservation and consumption reduction.

[0079] 2) By introducing ozone from inside the membrane, the present application successfully increases the residence time of ozone inside the membrane and reduces the space for ozone mass transfer, thus significantly improving the mass transfer efficiency. Ozone directly acts on the substances that cause membrane fouling inside the membrane pores and on the membrane surface, significantly improving the oxidation and degradation efficiency of ozone and effectively removing the irreversible fouling of the membrane.

[0080] 3) The device provided by this application avoids a series of problems such as the blockage of aeration holes when the aeration device exists independently; in addition, this device also has the function of introducing ozone into the membrane. By introducing ozone into the membrane, the oxidation efficiency of ozone on membrane pollutants can be improved, substances causing membrane pollution such as proteins and polysaccharides in the membrane pores and on the membrane surface can be degraded, the irreversible pollution of the membrane can be significantly reduced, and in-depth chemical cleaning of membrane pollutants can be achieved. At the same time, the water production solenoid valve 5, air solenoid valve 19, and ozone solenoid valve 13 of each ceramic membrane sheet 2 can be independently controlled, enabling some ceramic membrane sheets 2 in the membrane module 1 to conduct internal air or ozone introduction while some ceramic membrane sheets 2 conduct water production, greatly improving the water production efficiency and service life of the membrane.

[0081] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered to be within the scope described in this specification.

[0082] Specific examples are used in this article to elaborate on the principle and implementation mode of this application. The description of the above embodiments is only used to help understand the method and its core idea of this application; at the same time, for those of ordinary skill in the art, based on the idea of this application, there will be changes in the specific implementation mode and application scope. In summary, the content of this specification should not be construed as a limitation to this application.

Claims

1. A device for internal aeration and ozone in a water treatment membrane module, characterized in that, The device includes: An air compressor, an ozone generator, an air solenoid valve, an ozone solenoid valve, an air pressure regulating valve, an ozone pressure regulating valve, a plurality of intake branch pipes, a water production pipe, a water production solenoid valve, and a membrane module; the membrane module includes a plurality of ceramic membrane sheets; one side of each ceramic membrane sheet of the membrane module is connected to the water production pipe, and a water production solenoid valve is arranged on the water production pipe, and the other side is connected to the intake branch pipe, and the intake branch pipe is formed by the confluence of an air intake branch pipe and an ozone intake branch pipe; the air solenoid valve and the air pressure regulating valve are arranged on the air intake branch pipe, and the air compressor is connected to one side of the air pressure regulating valve; the ozone solenoid valve and the ozone pressure regulating valve are arranged on the ozone intake branch pipe; the ozone generator is connected to one side of the ozone pressure regulating valve.

2. The device for internal aeration and ozone in a water treatment membrane module according to claim 1, characterized in that, The air solenoid valve and the air pressure regulating valve on each air intake branch pipe correspondingly control each ceramic membrane sheet connected to the air intake branch pipe.

3. The device for internal aeration and ozone in a water treatment membrane module according to claim 1, characterized in that, The ozone solenoid valve and the ozone pressure regulating valve on each ozone intake branch pipe correspondingly control each ceramic membrane sheet connected to the ozone intake branch pipe.

4. The device for internal aeration and ozone in a water treatment membrane module according to claim 1, characterized in that, The maximum internal gas pressure that the air solenoid valve, the ozone solenoid valve, the air pressure regulating valve, the ozone pressure regulating valve, the intake branch pipe, the water production pipe, the water production solenoid valve, and the membrane module can withstand is all 1.25 Mpa.

5. The device for internal aeration and ozone in a water treatment membrane module according to claim 1, characterized in that, The pore size range of the ceramic membrane sheet is from nanometer level to micron level.

6. The device for built-in aeration and ozone in a water treatment membrane module according to claim 5, characterized in that, Air or ozone enters the ceramic membrane sheet through the air intake branch pipe or the ozone intake branch pipe under a set air pressure, and diffuses into the solution of the membrane bioreactor through the membrane pores of the ceramic membrane sheet, generating air bubbles or ozone bubbles from nanometer level to micron level.

7. The device for internal aeration and ozone in a water treatment membrane module according to claim 1, characterized in that, The minimum distance between the ceramic membrane sheets in the membrane module is 5 mm.

8. A method for removing membrane fouling of a device with built-in aeration and ozone in the water treatment membrane module according to any one of claims 1-7, characterized in that, The method for removing membrane fouling includes: Controlling the air compressor to generate high-pressure gas; Controlling the ozone generator to generate ozone gas; During the air aeration process, controlling the high-pressure gas to enter the ceramic membrane sheet through the air pressure regulating valve, the air solenoid valve, and the air intake branch pipe, and generating air bubbles from nanometer level to micron level through the membrane pores of the ceramic membrane sheet, and diffusing into the solution of the membrane bioreactor; the high-pressure gas is used to scour the pollutants in the membrane pores and on the membrane surface of the ceramic membrane sheet; the air aeration process is realized by setting the pressure of the air pressure regulating valve and the aeration duration; During the ozone oxidation process, controlling the ozone gas to enter the ceramic membrane sheet through the ozone pressure regulating valve, the ozone solenoid valve, and the ozone intake branch pipe, and generating ozone bubbles from nanometer level to micron level through the membrane pores of the ceramic membrane sheet, and diffusing into the solution of the membrane bioreactor; the ozone gas is used to oxidize the membrane pollutants in the membrane pores and on the membrane surface of the ceramic membrane sheet; the ozone oxidation process is realized by setting the pressure of the ozone pressure regulating valve and the ozone oxidation duration.

9. The membrane fouling removal method according to claim 8, wherein During the air aeration process, controlling the high-pressure gas to enter the ceramic membrane sheet through the air pressure regulating valve, the air solenoid valve, and the air intake branch pipe, and generating air bubbles from nanometer level to micron level through the membrane pores of the ceramic membrane sheet, and diffusing into the solution of the membrane bioreactor, specifically including: The dissolved oxygen concentration in the solution of the membrane bioreactor is measured in real time by an online dissolved oxygen meter; When the measured dissolved oxygen concentration is lower than the set range, the aeration pressure is increased or the aeration duration is extended; When the measured dissolved oxygen concentration is higher than the set range, the aeration pressure is decreased or the aeration duration is shortened; When the measured dissolved oxygen concentration is within the set range, the current aeration pressure is maintained.

10. The membrane fouling removal method according to claim 8, wherein During the ozone oxidation process, control the ozone gas to enter the ceramic membrane through the ozone pressure regulating valve, ozone solenoid valve and ozone inlet branch pipe, and generate nano-scale to micron-scale ozone bubbles through the membrane pores of the ceramic membrane, which diffuse into the solution of the membrane bioreactor. Specifically, it includes: The ozone concentration in the solution of the membrane bioreactor is measured in real time by an online ozone concentration detector; When the monitored transmembrane pressure difference is lower than the set range, start the ozone oxidation process and set the ozone pressure and the start-up duration of the ozone generator; When the ozone concentration in the membrane bioreactor reaches the established range, after maintaining the set ozone pressure for the set time, terminate the ozone oxidation process.

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