Aeration device, immersion membrane module including the same, and immersion membrane filtration device

Abstract

The present invention relates to an aeration device, an immersion membrane module including the same, and an immersion membrane filtration device, and provides an aeration device. The aeration device includes a main shell (1100) having a hollow lumen (1103) and an opening at the bottom (1102) communicating with the lumen, an aeration pipe (111) penetrating the top (1101) of the main shell and communicating with the lumen, and a gas conduit (1200) disposed within the lumen, one end penetrating to the top and the other end positioned close to the bottom, with a gas introduction passage (1201) extending linearly through both ends provided inside, and a lateral vent hole (1202) communicating with the gas introduction passage provided in the side wall. The present invention also provides an immersion membrane module including the aeration device and an immersion membrane filtration device.

Description

Technical Field

[0001] The present invention belongs to the technical field of water treatment, and relates to an aeration device, an immersion-type membrane module including the aeration device, and an immersion-type membrane filtration device.

Background Art

[0002] Since the membrane separation technology has selective separation characteristics, it is widely used in the water treatment industry.

[0003] In the membrane bioreactor technology, a filtration membrane element is installed in a bioreactor. After most of the pollutants are removed by the activated sludge in the mixed liquid, filtered water is generated through the filtration membrane installed in the bioreactor, realizing the regeneration and utilization of water.

[0004] In existing membrane bioreactors, an aeration device is used to generate bubbles. When the bubbles burst, the impact force generated washes away the surface of the hollow fiber membrane, peeling off the sludge attached to the hollow fiber membrane to improve the filtration efficiency.

[0005] However, existing aeration devices are equipped with gas conduits for generating bubbles. Due to the inflow and outflow of sewage into the gas conduits during operation stops or over a long period, impurities solidified by dehydration coagulation are likely to occur on the inner wall of the gas conduits. As a result, the gas inlet in the gas conduit is blocked by the peeled and solidified impurities, leading to poor aeration. When aerating from multiple gas inlets, aeration is possible, but aeration cannot be performed at the gas inlets blocked by the solidified impurities, resulting in uneven intake of the aeration device and a decrease in the gas washing effect.

[0006] Currently, devices for purifying water using membrane separation technology mainly include pressure-type membrane filtration devices and immersion-type membrane filtration devices. Among them, the immersion-type membrane filtration device includes a frame and a plurality of membrane elements arranged on the frame. The plurality of membrane elements are arranged in a matrix, and each membrane element is provided with a produced water outlet. The produced water outlets in the same row communicate with a single produced water branch pipe.

[0007] However, the membrane elements arranged in a matrix have multiple rows, meaning that each membrane element in the same row is connected to and corresponds to one generated water branch pipe. Therefore, the above design method tends to result in a large number of branch pipes in the generated water pipeline, making the pipeline design complex, which leads to higher manufacturing costs and complicated installation. [Overview of the project] [Problems that the invention aims to solve]

[0008] The first technical problem to be solved by the present invention is to provide an aeration device that can solve the problem of gas conduits being blocked by solid impurities.

[0009] The second technical problem to be solved by the present invention is to provide an immersion-type membrane module that can solve the problem of low gas cleaning effect.

[0010] The third technical problem to be solved by the present invention is to provide an immersion membrane filtration system that can solve the problem of the complexity of the piping layout in conventional immersion membrane filtration systems. [Means for solving the problem]

[0011] The first technical challenge described above is solved by the following technical solution.

[0012] A main body shell having a hollow internal cavity and an opening at the bottom that communicates with the internal cavity, An aeration pipe that penetrates the top of the main shell and communicates with the lumen, An aeration device including a gas conduit arranged inside a lumen, one end of which penetrates to the top and the other end located near the bottom, with a gas introduction passage extending linearly through both ends provided inside, and a lateral vent hole in the side wall that communicates with the gas introduction passage.

[0013] In the aeration device of the above embodiment, since the gas conduit penetrates the top and extends to the bottom, the gas conduit is arranged vertically within the main shell. Furthermore, since the gas introduction passage within the gas conduit is cylindrical and the lateral vents are provided on the side walls of the gas conduit, after solidified impurities detach from the inner wall of the gas conduit, they slide down along the gas introduction passage due to gravity and are finally discharged from the lower end of the gas conduit, preventing the solidified impurities from blocking the lateral vents.

[0014] In one embodiment, Including an aeration cup, The aeration cup is positioned inside the lumen of the aeration tube, covering one end away from the top, and a flow path is formed between the inner wall of the aeration cup and the aeration tube.

[0015] In one embodiment, At least two aeration pipes are provided, penetrating the top, and aeration cups are provided to cover the ends of multiple aeration pipes.

[0016] In one embodiment, The gas conduit is positioned close to the side wall of the lumen, and the lateral vents are positioned towards the aeration pipe.

[0017] In one embodiment, The other end of the gas conduit penetrates all the way to the opening at the bottom. The lower end of the gas conduit is lower, the greater the intake pressure it can withstand. However, if the lower end of the gas conduit is lower than the bottom, there is a risk that bubbles discharged from the lower end of the gas conduit will overflow from the main shell. Therefore, assuming that the gas does not overflow from the main shell, extending the lower end of the gas conduit closer to the flat bottom will increase the intake flow rate that the gas conduit can tolerate.

[0018] In one embodiment, The other end of the gas conduit is an inclined surface that slopes inward toward the interior of the lumen with respect to the plane of the opening, and both the inclined surface and the lateral vent are oriented toward the same side of the gas conduit. Since the end face of the other end of the gas conduit is an inclined surface, the gas discharged from the inclined surface of the gas conduit overflows from the side closer to the aeration pipe, and the gas directly flows into the main body shell which is the inner cavity, thus preventing waste of the overflowed gas.

[0019] In one embodiment, The flow area of the gas introduction passage is larger than the flow area of the side vent holes.

[0020] The above-mentioned second technical problem is solved by the following technical solution.

[0021] A hollow fiber membrane, An upper water collection unit and a lower water collection unit connected to both ends of the hollow fiber membrane, An immersion-type membrane module including the aeration device described in the above embodiment connected to the lower end of the lower water collection unit.

[0022] The immersion-type membrane module of the above embodiment includes the aeration device of the present invention. Therefore, the immersion-type membrane module of the present invention can obtain the same beneficial effects as the aeration device of the above embodiment.

[0023] In one embodiment, The upper water collection unit includes a gas introduction pipe communicating with the gas conduit, and the axis of the gas introduction pipe and the axis of the gas conduit are located on the same straight line.

[0024] In one embodiment, Further includes a support rod, The support rod is connected between the upper water collection unit and the lower water collection unit.

[0025] The above-mentioned third technical problem is solved by the following technical solution.

[0026] An immersion-type membrane filtration device including a frame, at least one membrane element group, a generated water pipeline, and a connection pipe group, The group of membrane elements includes a plurality of membrane elements distributed along a first direction and arranged within the frame, and each membrane element is provided with a generated water outlet at its upper end for generating filtered water filtered by the membrane element. The generated water pipeline includes at least one generated water branch pipe, the generated water branch pipe is located in the frame, The aforementioned group of connecting pipes includes a T-shaped pipe for generated water that communicates with two adjacent generated water outlets and one generated water branch pipe, respectively, and the T-shaped pipe for generated water is used to collect the filtered water and transport it to the generated water branch pipe, in an immersion membrane filtration apparatus.

[0027] In one embodiment, The aeration pipeline further includes, and the group of connecting pipes further includes a T-shaped pipe for aeration. The aeration pipeline includes at least one gas introduction branch pipe located in the frame, An aeration inlet is provided at the upper end of each membrane element, spaced apart from the generated water outlet, and the aeration inlet is used to introduce a first gas for cleaning the membrane element. The two aeration inlets in two adjacent membrane elements along the first direction are arranged adjacent to each other, and / or the two generated water outlets in two adjacent membrane elements along the first direction are arranged adjacent to each other. The aeration T-pipe is connected to two adjacent aeration inlets and one gas introduction branch pipe, respectively, and is used to divert the first gas in the gas introduction branch pipe and transport it to the aeration inlets.

[0028] In one embodiment, The generated water branch pipe is provided with at least one water supply pipe that communicates with itself, and the generated water T-joint is connected to two adjacent generated water outlets and one water supply pipe, respectively. The gas introduction branch pipe is provided with at least one gas supply pipe that communicates with itself, and the aeration T-joint is connected to two adjacent aeration inlets and one gas supply pipe, respectively.

[0029] In one embodiment, The number of the membrane element groups is multiple, and the multiple membrane element groups are arranged along a second direction perpendicular to the first direction. The generated water branch pipe is provided with multiple water supply pipes distributed along the second direction, and the generated water outlets of the membrane elements arranged along the second direction correspond one-to-one with the water supply pipes of the same generated water branch pipe. The gas introduction branch pipe is provided with multiple gas supply pipes distributed along the second direction, and the aeration inlets of the membrane elements arranged along the second direction correspond one-to-one with the gas supply pipes of the same gas introduction branch pipe.

[0030] In one embodiment, The system further includes connecting pipelines, the connecting pipelines comprising a first pipeline and a second pipeline, the first pipeline and the second pipeline being spaced apart in the frame, and the generated water branch pipe and the gas introduction branch pipe both being installed between the first pipeline and the second pipeline and connected to the first pipeline and the second pipeline.

[0031] In one embodiment, The first pipeline is the main pipeline for generated water, one end of the generated water branch pipe is connected to the first pipeline, and the other end of the generated water branch pipe is fixed to the second pipeline but is not connected to the second pipeline. The main pipeline for generated water is used to collect the filtered water in the generated water branch pipe.

[0032] In one embodiment, The second pipeline is a gas introduction main pipe, one end of the gas introduction branch pipe is connected to the second pipeline, and the other end of the gas introduction branch pipe is fixed to the first pipeline but is not connected to the first pipeline. The gas introduction main pipe is used to send the first gas to the gas introduction branch pipe.

[0033] In one embodiment, Both the first and second pipelines are main pipelines for generated water, one end of the generated water branch pipe is connected to the first pipeline, the other end of the generated water branch pipe is connected to the second pipeline, and both ends of the gas introduction branch pipe are fixed to correspond to the first and second pipelines, respectively, but do not communicate with the first and second pipelines.

[0034] In one embodiment, The connecting pipeline further includes a third pipeline fixed to the frame and extending in a direction parallel to the first direction, the third pipeline being a gas inlet main pipeline located above the gas inlet branch pipeline and communicating with the gas inlet branch pipeline.

[0035] In one embodiment, The T-shaped pipe for generated water includes a first generated water main pipe and two first generated water branch pipes, the two first generated water branch pipes being spaced apart on the wall of the first generated water main pipe and communicating with the first generated water main pipe.

[0036] In one embodiment, The membrane element includes an upper end cover, a hollow fiber membrane, and the aeration device of the above embodiment, which are arranged in sequence. [Effects of the Invention]

[0037] (1) In the aeration device of the present invention, the gas introduction passage in the gas conduit arranged vertically within the main shell is cylindrical, and the lateral vents are provided on the side walls of the gas conduit. Therefore, after solidified impurities peel off from the inner wall of the gas conduit, they fall along the gas introduction passage by gravity and are eventually discharged from the gas conduit, preventing the solidified impurities from blocking the lateral vents and thus resolving the problem of the gas conduit being blocked by solidified impurities.

[0038] (2) The immersion membrane module of the present invention can solve the problem of low gas cleaning effect.

[0039] (3) In the immersion membrane filtration system of the present invention, two adjacent membrane elements distributed along a first direction in the membrane element group are connected to a single generated water branch pipe via a T-shaped pipe for generated water. Compared to the conventional system where each membrane element in the same row is connected to a single water generated branch pipe, the number of generated water branch pipes is reduced, the piping design is simplified, installation is simplified, manufacturing costs are reduced, and thus the complexity of the piping layout in conventional immersion membrane filtration systems can be solved. [Brief explanation of the drawing]

[0040] [Figure 1] Figure 1 is a schematic diagram of an aeration device according to one embodiment of the present invention. [Figure 2] Figure 2 is a cross-sectional view of an aeration device according to one embodiment of the present invention. [Figure 3] Figure 3 is a partially enlarged schematic diagram of section A in Figure 2. [Figure 4] Figure 4 is a schematic diagram of the airflow of an aeration device according to one embodiment of the present invention. [Figure 5] Figure 5 is a schematic diagram of the airflow of an aeration device according to another embodiment of the present invention. [Figure 6] Figure 6 is a schematic diagram of the airflow of an aeration device according to another embodiment of the present invention. [Figure 7] Figure 7 is a schematic diagram of an immersion membrane module according to one embodiment of the present invention. [Figure 8] Figure 8 is a schematic diagram of an immersion-type membrane filtration apparatus according to one embodiment of the present invention. [Figure 9] Figure 9 is a schematic diagram of an immersion-type membrane filtration apparatus according to another embodiment of the present invention. [Figure 10] Figure 10 is a schematic diagram of a T-shaped pipe for generated water according to one embodiment of the present invention. [Modes for carrying out the invention]

[0041] To make the above-mentioned objectives, features, and advantages of the present invention clearer and easier to understand, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following description includes many specific details to facilitate a complete understanding of the present invention. However, the present invention may be carried out in many other forms different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present invention; therefore, the present invention is not limited to the specific embodiments disclosed below.

[0042] In the description of this invention, if terms such as "center," "vertical," "horizontal," "length," "width," "thickness," "top," "bottom," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" are used, the orientations and positional relationships indicated by these terms are based on the orientations and positional relationships shown in the accompanying drawings and are used solely for the convenience of describing the invention and to simplify the explanation. It should be understood that these terms do not teach or suggest that the devices or elements mentioned have a specific orientation or must be configured and operated in a specific orientation, and therefore should not be understood as limitations on this invention.

[0043] Furthermore, where the terms “first” or “second” are used, these terms are used for descriptive purposes only and should not be understood as teaching or suggesting relative importance or implicitly specifying the number of technical features shown. Accordingly, features limited as “first” or “second” may explicitly or implicitly include at least one such feature. Where the term “multiple” is used in the description of the present invention, “multiple” means at least two, for example, two, three, etc., unless otherwise explicitly limited.

[0044] In the present invention, unless otherwise explicitly stated or limited, terms such as “attachment,” “connection,” “linking,” and “fixing” should be interpreted broadly. For example, unless otherwise explicitly stated, these may be fixed connections, removable connections, or integral structures; mechanical connections or electrical connections; direct connections or indirect connections via an intermediate medium; or internal communication between two elements or interaction relationships between two elements. Those skilled in the art will be able to understand the specific meaning of these terms in the present invention based on the specific circumstances.

[0045] In the present invention, unless otherwise explicitly stated or limited, any description similar to "above" or "below" the second feature means that the first and second features are in direct contact or indirectly in contact through an intermediate medium. Furthermore, "above," "above," or "below" the second feature may mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher level than the second feature. "Below," "below," or "below" the second feature may mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower level than the second feature.

[0046] It needs to be explained that when one element is said to be “attached” or “positioned” to another element, it may be directly on top of the other element, or there may be an intermediate element as well. When one element is considered to be “connected” to another element, it may be directly connected to the other element, or there may be an intermediate element simultaneously. The terms “vertical,” “horizontal,” “up,” “down,” “left,” “right,” and similar expressions used in this invention are for illustrative purposes only, where present, and do not represent only the embodiment.

[0047] Please refer to the attached diagram below.

[0048] Figure 1 is a schematic diagram of an aeration device according to one embodiment of the present invention. Figure 2 is a cross-sectional view of an aeration device according to one embodiment of the present invention. As shown in Figures 1 and 2, the aeration device 213 of the present invention includes a main shell 1100, an aeration pipe 111, an aeration cup 1300, and a gas conduit 1200. The main shell includes a top portion 1101 and a bottom portion 1102, and has a hollow lumen 1103 inside. An opening communicating with the lumen is formed at the bottom of the main shell, and when the aeration device is immersed in a mixed liquid, the mixed liquid can be filled into the lumen through the opening. Since the aeration pipe is positioned to penetrate the top portion of the main shell, the aeration pipe communicates with the lumen. The aeration cup is located inside the lumen, and a flow path 1301 is formed between the aeration cup and the aeration pipe. A gas introduction passage 1201 is provided in the gas conduit. The gas introduction passage extends along a straight line c, penetrating both ends of the gas conduit. One end of the gas conduit penetrates the top, and the other end is positioned close to the bottom, so the gas introduction passage inside the gas conduit has a columnar structure. Lateral vents 1202 are provided in the side wall of the gas conduit. The lateral vents 1202 communicate with the gas introduction passage and are located within the lumen. The end face of the other end of the gas conduit is an inclined surface 1203, which is inclined with respect to the plane of the bottom. The inclined surface forms an angle α with respect to the end face of the bottom, and the angle range of α is 10° to 60°. The inclined surface is inclined toward the interior of the lumen with respect to the plane of the opening, and the inclined surface and the lateral vents 202 face the same side of the gas conduit. If the gas flow rate input to the aeration device is too high, it will exceed the maximum intake pressure that the gas conduit can withstand, causing gas to overflow from the inclined end of the gas conduit and diffuse outside the aeration device. The inclined surface of the gas conduit is oriented in the direction of the aeration pipe 11 of the main shell.

[0049] In the present invention, the intermittent aeration process of the aeration device involves the following steps: When the aeration device passes gas from the upper end of the gas conduit to the gas introduction passage, gas is discharged from the lateral vents and enters the lumen. Subsequently, the gas that enters the lumen accumulates at the top of the lumen, i.e., the gas accumulates near the top. As the gas accumulates in the lumen, the space occupied by the gas gradually increases, compressing the mixed liquid in the lumen and causing it to gradually be discharged from the opening, thereby gradually lowering the liquid level in the lumen. When the liquid level in the lumen falls below the lower end surface of the aeration pipe, the gas is pushed into the aeration pipe and instantaneously released through the aeration pipe, causing bubbles with a certain impact force to be released from the aeration pipe. Once the release is complete, the mixed liquid is refilled into the lumen, and at this time the aeration pipe does not release gas. Therefore, gas is continuously transported to the aeration device through the gas conduit, and the aeration pipe intermittently releases gas, thereby the aeration device performs intermittent aeration.

[0050] Figure 3 is a partially enlarged schematic diagram of A in Figure 2. As shown in Figure 3, the lower end of the gas conduit penetrates to the opening of the bottom 1102, and the lower end surface of the gas conduit is flush with the bottom end surface. When gas is transported to the aeration device, due to the effect of air pressure, as the gas enters the lumen of the main shell through the lateral vents, some of the liquid in the gas conduit is discharged from the lower end. The lower the lower end surface of the gas conduit, the greater the intake pressure it can withstand. In other words, if the gas does not overflow from the lower end of the gas conduit, the allowable intake flow rate is determined by the depth of the lower end surface of the gas conduit in the liquid. Therefore, the allowable intake flow rate of the gas conduit is maximized when the lower end surface of the gas conduit is flush with the lower end surface of the main shell. The inclined surface includes an acute angle side 12031 and an obtuse angle side 12032, with the acute and obtuse angles being opposite each other, and the inclined surface gradually shifts towards the lumen 1201 from the acute angle side to the obtuse angle side. Of these, the acute-angled side is flush with the bottom end face, but the obtuse-angled side is higher than the bottom end face, meaning the obtuse-angled side is located inside the lumen. Gas overflowing from the obtuse-angled side enters the lumen of the main shell directly, preventing waste of overflowing gas, allowing the gas to be used for bubble formation, and ultimately saving energy. The angle α between the inclined surface and the bottom end face determines the distance h between the obtuse-angled side and the bottom end face. The larger the angle α between the inclined surface and the bottom end face, the greater the distance between the obtuse-angled side and the bottom end face. Furthermore, the larger the distance between the obtuse-angled side and the bottom end face, the greater the impact on the allowable intake airflow rate of the gas conduit. Also, if the distance between the obtuse-angled side and the bottom end face is small, bubbles are more likely to overflow to the outside of the main shell. Considering the large allowable intake flow rate of the gas conduit and the fact that air bubbles are less likely to overflow to the outside of the main shell, the angle α between the inclined surface and the bottom end surface should be in the range of 20° to 45°.

[0051] Furthermore, refer to Figure 4, a schematic diagram of the airflow of an aeration device according to one embodiment of the present invention. As shown in Figure 4, the lower end of the aeration tube extends into the aeration cup, and a flow path is formed between the aeration cup and the aeration tube. When the liquid level in the lumen 1103 is lower than the upper end surface of the aeration cup, the mixture contained in the flow path is pushed into the intermediate aeration tube and discharged from the first bubble passage 1111. When the liquid level in the lumen is lower than the lower end surface of the aeration tube, and the liquid level in the flow path is lower than the lower end surface of the aeration tube, the gas releases larger bubbles in the aeration tube due to the siphon effect.

[0052] When using such an aeration system, the gas conduit will have alternating gas and liquid states for extended periods, making it easy for the mixture to adhere to the inner walls of the conduit. Furthermore, because of the airflow, the mixture adhering to the inner walls of the conduit dehydrates and solidifies, resulting in solidified impurities. As the amount of impurities increases, external forces can cause them to detach, and these detached impurities can accumulate in the gas conduit or be carried by the airflow to block the gas inlet, affecting the aeration of the aeration system. To prevent blockage of the gas inlet, it is necessary to clean the solidified impurities in the gas conduit after a certain period of use, which leads to a decrease in user experience.

[0053] In this invention, since the gas introduction passage 1201 in the gas conduit has a columnar structure that extends in a straight line, the detached impurities are discharged from the lower end of the gas conduit along the gas introduction passage by gravity. Furthermore, since lateral vents 1202 are provided in the side wall of the gas introduction passage, the detached impurities are less likely to adhere to the lateral vents. Therefore, impurities in the gas conduit are discharged from the gas conduit on their own, avoiding clogging of the lateral vents, thus reducing the frequency of cleaning the gas conduit and improving the user experience.

[0054] The gas conduit has an upper and lower end at each end, the gas conduit penetrates the top, the upper end of the gas conduit extends to the outside of the main shell, and the lower end of the gas conduit extends into the lumen, and the lower end of the gas conduit gradually approaches the bottom, and since the axis of the columnar gas introduction passage is parallel to the vertical line of the gas conduit, the gas introduction passage becomes a straight passage perpendicular to the horizontal plane, and when dewatered and solidified impurities detach within the gas introduction passage, the impurities fall due to gravity without being restricted by the gas introduction passage and are smoothly discharged from the lower end of the gas conduit.

[0055] The shape of the gas introduction passage may be cylindrical or rectangular, resulting in a hollow structure where the gas conduit extends vertically downwards. Alternatively, the gas introduction passage may be tapered, resulting in an upper end area smaller than the lower end area. Any shape of the gas introduction passage that is not limited by the inner wall of the gas introduction passage when impurities fall through should be considered a specific embodiment of the present invention.

[0056] More specifically, the configuration in which one end of the aeration pipe extends into the aeration cup and a flow path 1301 is formed between the aeration cup and the aeration pipe is as follows: The aeration pipe extends into the aeration cup, the lower end surface of the aeration pipe is close to the bottom of the aeration cup, and a gap is provided between the lower end surface of the aeration pipe and the bottom of the aeration cup, forming a flow path that passes through the inside of the aeration pipe and the aeration cup, the cross-sectional shape of the flow path is U-shaped, and the gas inlet of the aeration pipe is located at the lowest position in the vertical direction of the flow path. The reason for this is that when gas needs to be discharged from the aeration tube, the mixture in the aeration cup needs to be pushed out of the tube, which increases the gas pressure in the lumen, increases the amount of gas discharged from the tube, and causes larger bubbles. After the aeration tube has removed the gas from the lumen, the aeration tube and the flow path also undergo a siphon effect, drawing in more gas, the mixture is refilled into the lumen, the liquid level in the lumen rises, the mixture flows into the mixture in the aeration cup and seals the aeration tube, and then gas accumulates in the lumen again.

[0057] In another embodiment, see Figure 5, which is a schematic diagram of the airflow of an aeration device according to another embodiment of the present invention. Figure 5 is similar to Figure 4, but differs in that at least two aeration pipes are provided penetrating the top, and aeration cups are provided covering the ends of the multiple aeration pipes. The multiple aeration pipes accelerate the bubble release rate from the aeration pipes, shorten the frequency of the bubble release cycle, and improve cleaning efficiency by simultaneously releasing bubbles from the first bubble passage and the second bubble passage 1112. Furthermore, by simultaneously releasing bubbles from the multiple aeration pipes, bubbles released from different aeration pipes can be guided to different areas, improving the uniformity of the bubbles, thus improving cleaning quality and obtaining a better cleaning effect.

[0058] For example, if an aeration system is installed horizontally, and the system is tilted, gas will have difficulty being discharged from some of the aeration pipes, affecting the uniformity of bubble release. Specifically, installing an aeration system horizontally means that the end faces of the aeration pipes extending into the aeration cups are on the same horizontal plane, and the bottom surface of the aeration cups is installed parallel to the end faces of the aeration pipes extending into the aeration cups.

[0059] In another embodiment, see Figure 6, a schematic diagram of the airflow of an aeration device according to another embodiment of the present invention. Figure 6 is similar to Figure 5, but differs in that the aeration cup is divided into multiple independent chambers by a partition plate 1302, and the aeration pipes extend correspondingly into each chamber, thereby forming relatively independent flow paths between the aeration pipes and the chambers. Since the flow paths separated by the partition plate transport gas independently, the exhaust from the aeration pipes does not interfere with each other.

[0060] Figure 7 is a schematic diagram of an immersion membrane module according to one embodiment of the present invention. As shown in Figure 7, the immersion membrane module of the present invention includes an aeration device 213, an upper water collection unit 130, a lower water collection unit 140, and a hollow fiber membrane 212, the upper water collection unit and the lower water collection unit are connected to both ends of the hollow fiber membrane, and the aeration device is connected to the lower end of the lower water collection unit.

[0061] Specifically, the upper water collection unit includes a gas inlet pipe 131 that communicates with the gas conduit 1200 and a generated water pipe 132. The generated water pipe communicates with a hollow fiber membrane, allowing the liquid filtered by the hollow fiber membrane to be sent to the generated water pipe and discharged. Here, the axis of the gas inlet pipe and the axis of the gas conduit are located on the same straight line c. The piping inside the gas inlet pipe communicates with the gas inlet passage inside the gas conduit, and the piping and the gas inlet passage are on the same axis. The gas inlet pipe is connected to the gas conduit in such a way that it forms a gas passage without any bends inside. As a result, impurities that have been dewatered and solidified in the gas passage are removed and easily discharged from the lower end of the gas conduit by gravity.

[0062] Furthermore, the immersed membrane module further includes a support rod 150 connected between the upper water collection unit and the lower water collection unit, and the support rod is supported between the upper water collection unit and the lower water collection unit, thereby reducing the compressive force on the hollow fiber membrane by the upper water collection unit and the lower water collection unit.

[0063] Specifically, there are at least two hollow fiber membranes, which are arranged at equal intervals to form a filter group, and two support rods are positioned vertically spaced apart so that the filter group can be placed in the gap between the two support rods, with the two support rods positioned on either side of the filter group. The position of the filter group is restricted by the two support rods, which simultaneously support the upper and lower water collection units, and the force acting on each support rod is relatively small, thus making the support of the support rods more stable. The support rods may also be used to connect the gas conduit and the gas inlet pipe. The gas conduit is positioned close to the side wall of the lumen, and the lateral vents are positioned toward the aeration pipe, so that the gas in the gas inlet passage is discharged from the lateral vents toward the aeration pipe.

[0064] For example, the support rods are hollow in structure, and there are two of them. These two support rods are connected to a gas inlet pipe and a generated water pipe, respectively. Here, the support rod connected to the gas inlet pipe is also connected to a gas conduit. The support rods function not only as support but also as transport passages for fluids such as airflow and waterflow.

[0065] In some embodiments of the present invention, the flow area of ​​the gas introduction passage is larger than the flow area of ​​the lateral vent. Because the flow area of ​​the gas introduction passage is larger, the airflow in the gas introduction passage is larger, and the flow area of ​​the lateral vent is smaller. In order to match the flow rate of the gas introduction passage with the discharge rate of the lateral vent, the airflow is discharged from the lateral vent at a faster speed as it passes through the lateral vent, thereby injecting the airflow further toward the aeration pipe, and the gas comes closer to the aeration pipe. Specifically, the flow area of ​​the lateral vent provided in the side wall of the gas conduit is 28 mm². 2 ~314mm 2 That is the case.

[0066] Figure 8 is a schematic diagram of an immersion membrane filtration apparatus according to one embodiment of the present invention. As shown in Figure 8, the immersion membrane filtration apparatus 10 of the present invention includes a frame 100, at least one membrane element group 200, a generated water pipeline 300, and a group of connecting pipes 400, and has the following configuration. The membrane element group includes a plurality of membrane elements 210 distributed along a first direction a and arranged within the frame, with a generated water outlet 2111 at the upper end of each membrane element for generating filtered water filtered by the membrane element. In a specific arrangement, the membrane elements include sequentially arranged upper end covers 211, hollow fiber membranes 212, and aeration devices 213, with a generated water outlet at the top of the upper end cover, and the hollow fiber membranes are used to filter raw water and generate filtered water. The number of membrane elements distributed along the first direction a in the membrane element group may be 2, 3, 4, 5, or more.

[0067] The generated water pipeline includes at least one generated water branch pipe 310, which is arranged in a frame, and in a specific arrangement, the generated water branch pipe is attached to the upper end of the frame, and the number of generated water branch pipes may be 1, 2, 3, 4, or more, and two adjacent membrane elements distributed along a first direction a in the membrane element group each constitute a pair of membrane elements, and each pair of membrane elements corresponds to one generated water branch pipe.

[0068] The connecting pipe group includes T-joints for generated water, each connecting to two adjacent generated water outlets and one generated water branch pipe. The T-joints for generated water are used to collect filtered water and transport it to the generated water branch pipe. This arrangement allows a pair of membrane elements to be connected to one generated water branch pipe via one T-joint for generated water. Compared to the conventional method where each membrane element in the same row is connected to one water generated branch pipe, the number of generated water branch pipes is reduced, the piping design is simplified, installation is simplified, and manufacturing costs are reduced.

[0069] To facilitate cleaning of the hollow fiber membrane, each membrane element is currently provided with an aeration inlet, and similarly, multiple aeration inlets in the same row are currently connected to a single gas introduction branch pipe, that is, each membrane element in the same row is connected to a single gas introduction branch pipe. To simplify the arrangement of the aeration pipeline, in a preferred embodiment, the immersion membrane filtration device further includes an aeration pipeline, and the group of connecting pipes further includes a T-shaped pipe for aeration, and has the following configuration. The aeration pipeline includes at least one gas inlet branch pipe 510 located in the frame, and in a specific arrangement, the number of gas inlet branch pipes may be one, two, three, four, or more, and the gas inlet branch pipes are attached to the upper end of the frame and spaced apart from the generated water branch pipes.

[0070] An aeration inlet 2112 is provided at the upper end of each membrane element, spaced apart from the generated water outlet. The aeration inlet is used to introduce a first gas for cleaning the membrane element. In the specific configuration, an aeration inlet is provided at the top of the upper end cover, spaced apart from the generated water outlet. Compressed air, which is the first gas, is transported to an aeration device through the aeration inlet. The aeration device is used to release the compressed air, which cleans the hollow fiber membrane with gas, thereby preventing fouling and clogging of the hollow fiber membrane.

[0071] Two aeration inlets in two adjacent membrane elements along the first direction a are positioned adjacent to each other, and / or two generated water outlets in two adjacent membrane elements along the first direction a are positioned adjacent to each other.

[0072] The aeration T-joint is connected to two adjacent aeration inlets and one gas introduction branch pipe, respectively, and is used to divert the first gas in the gas introduction branch pipe and transport it to the aeration inlets. With this arrangement, two adjacent membrane elements distributed along the first direction a can be connected to one gas introduction branch pipe via one aeration T-joint. Compared to the conventional method where each membrane element in the same row is connected to one gas introduction branch pipe, the number of gas introduction branch pipes is reduced, the piping design is simplified, installation is simplified, and manufacturing costs are reduced. In addition, the generated water branch pipe and the gas introduction branch pipe are fixed to the upper end of the frame, and the membrane elements can be connected to the generated water branch pipe and the gas introduction branch pipe via the generated water T-joint and the aeration T-joint. This eliminates the need for a separate membrane retaining device to fix the membrane elements, reducing manufacturing costs and making installation easier. To further stabilize the membrane elements, membrane element support rods are provided at the bottom of the frame.

[0073] Each membrane element is provided with a generated water outlet and an aeration inlet. To facilitate the arrangement of the generated water branch pipes and gas introduction branch pipes, the generated water outlets and aeration inlets in each membrane element may be arranged along the first direction a. In each group of membrane elements, the two aeration inlets of two adjacent membrane elements along the first direction a are arranged adjacent to each other, or the two generated water outlets are arranged adjacent to each other. Thus, two adjacent membrane elements along the first direction a have an adjacent pair of aeration ports or generated water outlets. For example, if a group of membrane elements includes three membrane elements arranged along the first direction a, the group of membrane elements has an adjacent pair of generated water outlets and an adjacent pair of aeration inlets arranged along the first direction a. Therefore, if each group of membrane elements includes at least three membrane elements, the gas introduction branch pipes and generated water branch pipes are arranged alternately along the first direction a. With the above arrangement, the first membrane element and the terminal membrane element in each group of membrane elements have a generated water outlet or aeration inlet that cannot be paired, and a single-port pipeline may be provided to connect such generated water outlets or aeration inlets, corresponding to a generated water branch pipe or a gas introduction branch pipe, respectively.

[0074] To more easily achieve communication between the generated water outlet and the generated water branch pipe, and between the aeration inlet and the gas introduction branch pipe, specifically, the generated water branch pipe is provided with at least one water supply pipe communicating with itself, the T-shaped pipe for generated water is provided with two adjacent generated water outlets and one water supply pipe, the gas introduction branch pipe is provided with at least one gas supply pipe communicating with itself, and the T-shaped pipe for aeration is provided with two adjacent aeration inlets and one gas supply pipe. In the specific arrangement, the water supply pipe is perpendicular to the generated water branch pipe, and the gas supply pipe is perpendicular to the gas introduction branch pipe.

[0075] To further optimize the generated water pipeline and aeration pipeline, more specifically, the number of membrane element groups is multiple, the multiple membrane element groups are arranged along a second direction b, the second direction b is perpendicular to the first direction a, the generated water branch pipe is provided with multiple water supply pipes distributed along the second direction b, the generated water outlets of the membrane elements arranged along the second direction b correspond one-to-one with the water supply pipes on the same generated water branch pipe, the gas introduction branch pipe is provided with multiple gas supply pipes distributed along the second direction b, and the aeration inlets of the membrane elements arranged along the second direction b correspond one-to-one with the gas supply pipes on the same gas introduction branch pipe. In specific arrangements, the number of membrane element groups may be 2, 3, 4, 5, or more, and the number of water supply pipes and gas supply pipes is usually set to be the same as the number of membrane element groups. With the above arrangement, membrane elements arranged along the first direction a form one row in each group of membrane elements, and multiple groups of membrane elements arranged along the second direction b form multiple rows, so that the membrane elements are arranged in a matrix, and two adjacent rows of membrane elements are connected to the same generated water branch pipe or gas introduction branch pipe via a T-joint for generated water or aeration, so that the number of generated water branch pipes and gas introduction branch pipes is greatly reduced and the generated water pipeline and aeration pipeline are simplified.

[0076] If the number of membrane elements in each row is too large, the generated water branch pipe or gas inlet branch pipe corresponding to each row needs to be customized to meet the length requirements. To broaden the application range of generated water branch pipes and gas inlet branch pipes, installing multiple unit-length generated water branch pipes or gas inlet branch pipes in series increases their versatility, facilitates mass production of generated water branch pipes and gas inlet branch pipes, and simultaneously facilitates the expansion of the module array of the immersion membrane filtration system.

[0077] If there are many membrane elements in each row, in order to uniformly distribute the filtered water in the generated water branch pipe, more specifically, the immersion membrane filtration system further includes a connecting pipe 600 which includes a first pipe 610 and a second pipe 620, both of which are generated water main pipes, one end of the generated water branch pipe is connected to the first pipe, the other end of the generated water branch pipe is connected to the second pipe, and both ends of the gas introduction branch pipe are fixed corresponding to the first pipe and the second pipe, respectively, but do not communicate with the first pipe and the second pipe. In the specific arrangement, the first connection port 611 of the first pipeline is arranged in a one-to-one correspondence with the second connection port of the second pipeline, one end of the generated water branch pipe communicates with the first connection port, and the other end of the generated water branch pipe communicates with the second connection port. The second dead-end hole 612 of the first pipeline is arranged in a one-to-one correspondence with the first dead-end hole of the second pipeline, one end of the generated water branch pipe is connected to the first dead-end hole, and the other end of the generated water branch pipe communicates with the second dead-end hole. The second connection ports and the first dead-end holes are arranged alternately, and the second dead-end holes and the first connection ports are arranged alternately. With the above arrangement, the generated water from the membrane element is collected in the first horizontal pipe and the second horizontal pipe via the generated water branch pipe and is generated from the first collection port of the generated water main pipe. A flange interface 800 may be provided at the first collection port, and the filtered water is transported to a predetermined location through an external pipeline connected to the flange interface.

[0078] If the number of membrane elements in each row is large, in order to better transport the first gas, the connecting pipeline further includes a third pipeline 630 fixed to the frame and extending in a direction parallel to the first direction a, the third pipeline being the main gas inlet pipeline, positioned above the gas inlet branch pipes and communicating with the gas inlet branch pipes. In the specific arrangement, the third pipeline is positioned at a distance from the first and second pipelines. In the above arrangement, if the third pipeline is the main gas inlet pipeline, a second collection port is provided in the third pipeline, and the first gas, which is compressed air, input from the second collection port is distributed from the third pipeline to the gas inlet branch pipes on both sides, flows into the aeration device, and the membrane elements are gas-washed by the aeration device.

[0079] In the specific configuration, fixing plates 640 are provided at both ends of the third pipeline, the lower ends of the fixing plates are connected to the frame, and multiple transport pipes are arranged in the third pipeline that communicate with itself, the multiple transport pipes are arranged at intervals along the first direction a, the transport pipes communicate with the gas introduction branch pipes, and the transport pipes are connected to the generated water branch pipes, but do not communicate with them. If the number of membrane elements in each row is too large, multiple generated water branch pipes are connected in series via the two horizontal pipe openings of the first T-joint, and multiple gas introduction branch pipes are connected in series via the two horizontal pipe openings of the second T-joint 420, and further, the fixing of the generated water branch pipes and the first T-joint is achieved by anchors 700, and the fixing of the gas introduction branch pipes and the second T-joint is achieved by anchors, the vertical pipe opening of the first T-joint does not communicate with the transport pipes, and the vertical pipe opening of the second T-joint communicates with the transport pipes.

[0080] It is easy to understand that the third pipeline also functions as the main pipeline for generated water, the original aeration pipeline becomes the generated water pipeline, the first and second pipelines also function as the main pipelines for gas introduction, the original generated water pipeline becomes the aeration pipeline, and all that is needed is to swap the generated water outlet and aeration inlet of the membrane element.

[0081] To facilitate maintenance of the piping of the immersion membrane filtration system, a lifting bracket 900 is provided at the top of the frame, which is convenient for lifting and transporting the immersion membrane filtration system. Furthermore, the first, second, and third pipelines, the generated water branch pipe, and the gas introduction branch pipe are all located at the top of the frame. In other words, all the pipelines of the immersion membrane filtration system are located at the top of the frame, so if a pipeline malfunctions and maintenance is required, it is only necessary to lower the liquid level until the pipelines at the top of the immersion membrane filtration system are exposed, making pipeline maintenance easy.

[0082] Figure 9 is a schematic diagram of the structure of an immersion membrane filtration apparatus according to another embodiment of the present invention. As shown in Figure 9, in order to rationally install the generated water branch pipe 310 and the gas introduction branch pipe 510 included in the aeration pipeline 500, the immersion membrane filtration apparatus 10 further includes a connecting pipeline, the connecting pipeline includes a first pipeline and a second pipeline 620, the first pipeline and the second pipeline are spaced apart from each other and arranged in the frame 100, the generated water branch pipe and the gas introduction branch pipe are both installed between the first pipeline and the second pipeline, and the generated water branch pipe and the gas introduction branch pipe are both connected to the first pipeline and the second pipeline. In the specific arrangement, the extension directions of the first and second pipelines are parallel to the first direction a, the first and second pipelines are spaced apart at the top of the frame along the second direction b, the extension direction of the generated water branch pipe and the gas introduction branch pipe is the second direction b, and the generated water branch pipe and the gas introduction branch pipe are perpendicular to the first and second pipelines, and the generated water branch pipe and the gas introduction branch pipe are fixed to the first and second pipelines by anchors.

[0083] To simplify the collection of filtered water, more specifically, the first pipeline is the main pipeline for generated water, one end of the generated water branch pipe is connected to the first pipeline, and the other end of the generated water branch pipe is fixed to the second pipeline, but not connected to the second pipeline. The main pipeline for generated water is used to collect filtered water from within the generated water branch pipe. In the specific arrangement, the first pipeline is provided with a first connection port that communicates with itself, and the first pipeline communicates with one end of the generated water branch pipe via the first connection port. The generated water branch pipe and the first pipeline are fixed together by anchors. The second pipeline is provided with a first blind hole that does not communicate with itself. The first blind hole is butt-connected to the other end of the generated water branch pipe, and the generated water branch pipe and the second pipeline are also fixed together by anchors. The first connection port and the first blind hole are arranged in a one-to-one ratio. To easily transport the filtered water collected in the main water generation pipe to a designated location, the main water generation pipe is provided with a first collection port communicating with itself, and a flange interface 800 may be attached to the first collection port, and the filtered water is transported to the designated location through an external pipeline connected to the flange interface.

[0084] More specifically, in order to deliver the first gas more conveniently, the second pipeline is a main gas inlet pipe, one end of the gas inlet branch pipe is connected to the second pipeline, and the other end of the gas inlet branch pipe is fixed to the first pipeline but does not connect to the first pipeline. The main gas inlet pipe is used to deliver the first gas to the gas inlet branch pipe. In the specific configuration, the second pipeline is also provided with a second connection port communicating with itself, and the second connection ports and the first blind holes are arranged alternately, communicating with one end of the gas introduction branch pipe via the second connection port, and the gas introduction branch pipe and the second pipeline are fixed by anchors. The first pipeline is also provided with a second blind hole that does not communicate with itself, and the second blind holes and the first connection ports are arranged alternately, and after the second blind holes are butt-connected to the other end of the gas introduction branch pipe, the gas introduction branch pipe and the first pipeline are also fixed by anchors, and the second connection ports and second blind holes are arranged in a one-to-one ratio. To easily transport the first gas, the gas introduction main pipe is provided with a second collection port communicating with itself, and a flange interface may be attached to the second collection port, and the external first gas is transported to an immersion membrane filtration device through an external pipeline connected to the flange interface.

[0085] To more easily achieve communication between the generated water outlet and the generated water branch pipe, and between the aeration inlet and the gas introduction branch pipe, specifically, the generated water branch pipe is provided with at least one water supply pipe 320 communicating with itself, the T-shaped pipe for generated water is connected to two adjacent generated water outlets and one water supply pipe, the gas introduction branch pipe is provided with at least one gas supply pipe 520 communicating with itself, and the T-shaped pipe for aeration is connected to two adjacent aeration inlets and one gas supply pipe. In the specific arrangement, the water supply pipe is perpendicular to the generated water branch pipe, and the gas supply pipe is perpendicular to the gas introduction branch pipe.

[0086] Figure 10 is a schematic diagram of a T-shaped pipe for generated water according to one embodiment of the present invention. As shown in Figure 10, in order to easily connect two adjacent generated water outlets to one generated water branch pipe, the T-shaped pipe 410 for generated water includes a first generated water main pipe 411 and two first generated water branch pipes 412, the two first generated water branch pipes are spaced apart from each other and are located on the wall of the first generated water main pipe and are in communication with the first generated water main pipe.

[0087] In the specific arrangement, the first generated water main pipe and the two first generated water branch pipes are both arranged vertically, the first generated water main pipe has a cavity structure with one end open, the open ends of the two first generated water branch pipes are located on the opposite side from the open end of the first generated water main pipe, a sealing groove may be provided on the outer wall of the first generated water main pipe, and the inner walls of the two first generated water branch pipes are smooth. When using a T-shaped pipe for generated water, the two first generated water branch pipes are connected to two adjacent generated water outlets in each row with spigot-type sealing, and the first generated water main pipe is connected to the water supply pipe of the generated water branch pipe with spigot-type sealing. Specifically, the two first generated water branch pipes are joined to two adjacent generated water outlets by pushing them in from top to bottom in a spigot-type connection, and when assembling the first generated water main pipe and water supply pipe, the generated water branch pipes are joined by pushing them in from top to bottom in a spigot-type connection. To ensure that the T-joint for generated water can properly collect filtered water, the diameter of the pores in the first generated water main is larger than that of the pores in the first generated water branch pipe, thereby ensuring that the flow rate of filtered water is properly distributed when it is collected through the T-joint for generated water. The T-joint for aeration includes a first aeration main and two first aeration branch pipes, and the specific structure of the T-joint for aeration is similar to that of the T-joint for generated water, and its structure facilitates the diversion of compressed gas.

[0088] The first and last membrane elements of each membrane element group have a generated water outlet or aeration inlet that cannot be paired, and when these are connected to the generated water outlet and gas introduction branch pipe via the corresponding T-joints for generated water and aeration, leakage can be prevented by simply plugging one of the first generated water branch pipes of the T-joint for generated water or one of the first aeration branch pipes of the T-joint for aeration.

[0089] The technical features of the embodiments described above can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the embodiments described above are listed, but any combination of these technical features that is inconsistent should be considered to be included within the scope of this specification.

[0090] The embodiments described above represent only a few embodiments of the present invention, and although the description is relatively specific and detailed, it should not be understood as limiting the scope of protection of the present invention. It should be noted that those skilled in the art will be able to make several changes and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Accordingly, the scope of protection of the present invention should be as defined by the appended claims. [Explanation of Symbols]

[0091] 213 Aeration equipment 1100 Main Shell 1101 Top 1102 Bottom 1103 Lumen 1200 Gas pipeline 1201 Gas Inlet Passage 1202 Side ventilation holes 1203 Slope 12031 Acute angle side 12032 Obtuse angle side 1300 Aeration Cups 1301 Flow channel 1302 Partition Plate 111 Arakawa 1111 First bubble passage 1112 Second bubble passage 130 Upper water collection unit 131 Gas inlet pipe 132 Generated water pipe 140 Lower water collection unit 150 support rod 212 Hollow fiber membrane 10 Immersion membrane filtration equipment a First direction b Second direction 100 frames 200 film element group 210 film element 211 Upper cover 2111 Produced water outlet 2112 Aeration Inlet 300 Generated water pipeline 310 Produced water branch pipe 320 Water supply pipe 400 connecting pipes 410 T-shaped pipe for produced water 411 First water-generating main pipe 412 First water generation branch pipe 420 Second T-joint 500 Aeration pipe 510 Gas Inlet Branch Pipe 520 Gas supply pipe 600 connecting conduits 610 First pipeline 611 First connection port 612 Second dead hole 620 Second pipeline 630 Third pipeline 640 Fixed plate 700 anchors 800 flange interface 900 Hanging hardware

Claims

1. A main body shell (1100) having a hollow internal lumen (1103) and an opening communicating with the internal lumen provided at the bottom (1102), An aeration pipe (111) penetrates the top (1101) of the main body shell and communicates with the lumen, An aeration device characterized by including a gas conduit (1200) disposed within the lumen, one end of which penetrates to the top and the other end which is located close to the bottom, a gas introduction passage (1201) extending linearly through both ends is provided inside, and a lateral vent hole (1202) communicating with the gas introduction passage is provided in the side wall.

2. Further including an aeration cup (1300), The aeration device according to claim 1, characterized in that the aeration cup is positioned within the lumen of the aeration pipe, covering one end of the aeration pipe away from its top, and a flow path (1301) is formed between the inner wall of the aeration cup and the aeration pipe.

3. The aeration device according to claim 2, characterized in that at least two of the aeration pipes are provided penetrating the top portion, and the aeration cups are provided covering the ends of a plurality of the aeration pipes.

4. The aeration device according to claim 1, characterized in that the gas conduit is positioned close to the side wall of the lumen and the lateral vent is positioned toward the aeration pipe.

5. The aeration device according to claim 4, characterized in that the other end of the gas conduit penetrates to the opening at the bottom.

6. The aeration device according to claim 5, characterized in that the other end of the gas conduit is an inclined surface (1203) that slopes toward the interior of the lumen with respect to the plane of the opening, and the inclined surface and the lateral vent hole are facing the same side of the gas conduit.

7. The aeration device according to any one of claims 1 to 6, characterized in that the flow area of ​​the gas introduction passage is larger than the flow area of ​​the lateral ventilation hole.

8. Hollow fiber membrane (212) and, An upper water collection unit (130) and a lower water collection unit (140) are connected to both ends of the hollow fiber membrane, An immersed membrane module characterized by including an aeration device (213) according to any one of claims 1 to 7, connected to the lower end of the lower water collection unit.

9. The immersion membrane module according to claim 8, characterized in that the upper water collection unit includes a gas introduction pipe (131) that communicates with the gas conduit, and the axis of the gas introduction pipe and the axis of the gas conduit are located on the same straight line.

10. Further including a support rod (150), The immersion type membrane module according to claim 8, characterized in that the support rod is connected between the upper water collection unit and the lower water collection unit.

11. An immersion-type membrane filtration apparatus comprising a frame (100), at least one group of membrane elements (200), a water-generating pipeline (300), and a group of connecting pipes (400), The group of membrane elements includes a plurality of membrane elements (210) distributed along a first direction and arranged within the frame, and each of the membrane elements is provided with a generated water outlet (2111) at its upper end for generating filtered water filtered by the membrane element. The generated water pipeline includes at least one generated water branch pipe (310), and the generated water branch pipe is arranged in the frame. The immersion-type membrane filtration apparatus is characterized in that the group of connecting pipes includes a T-shaped pipe (410) for generated water that communicates with two adjacent generated water outlets (2111) and one generated water branch pipe, respectively, and the T-shaped pipe for generated water is used to collect the filtered water and transport it to the generated water branch pipe.

12. The aeration pipeline (500) is further included, and the group of connecting pipes further includes a T-shaped pipe for aeration. The aeration pipeline includes at least one gas introduction branch pipe (510) located in the frame, An aeration inlet (2112) is provided at the upper end of each membrane element, spaced apart from the generated water outlet, and the aeration inlet is used to introduce a first gas for cleaning the membrane element. The two aeration inlets in two adjacent membrane elements along the first direction are arranged adjacent to each other, and / or the two generated water outlets in two adjacent membrane elements along the first direction are arranged adjacent to each other. The immersion membrane filtration apparatus according to claim 11, characterized in that the aeration T-shaped pipe is connected to two adjacent aeration inlets and one gas introduction branch pipe, respectively, and is used to divert the first gas in the gas introduction branch pipe and transport it to the aeration inlets.

13. The immersion-type membrane filtration apparatus according to claim 12, characterized in that the generated water branch pipe is provided with at least one water supply pipe (320) communicating with itself, the generated water T-pipe is communicated with two adjacent generated water outlets and one water supply pipe, the gas introduction branch pipe is provided with at least one gas supply pipe (520) communicating with itself, and the aeration T-pipe is communicated with two adjacent aeration inlets and one gas supply pipe.

14. The immersion-type membrane filtration apparatus according to claim 13, characterized in that the number of membrane element groups is multiple, the multiple membrane element groups are arranged along a second direction perpendicular to the first direction, the generated water branch pipe is provided with multiple water supply pipes distributed along the second direction, the generated water outlets of the membrane elements arranged along the second direction correspond one-to-one with the water supply pipes of the same generated water branch pipe, the gas introduction branch pipe is provided with multiple gas supply pipes distributed along the second direction, and the aeration inlets of the membrane elements arranged along the second direction correspond one-to-one with the gas supply pipes of the same gas introduction branch pipe.

15. The immersion membrane filtration apparatus according to claim 12, further comprising a connecting pipeline (600), the connecting pipeline comprising a first pipeline (610) and a second pipeline (620), the first pipeline and the second pipeline being spaced apart in the frame, and the generated water branch pipe and the gas introduction branch pipe both being installed between the first pipeline and the second pipeline and connected to the first pipeline and the second pipeline.

16. The immersion-type membrane filtration apparatus according to claim 15, characterized in that the first pipeline is a main pipeline for generated water, one end of the generated water branch pipe is connected to the first pipeline, the other end of the generated water branch pipe is fixed to the second pipeline but not connected to the second pipeline, and the main pipeline for generated water is used to collect the filtered water in the generated water branch pipe.

17. The immersion membrane filtration apparatus according to claim 15, characterized in that the second pipeline is a gas introduction main pipe, one end of the gas introduction branch pipe is in communication with the second pipeline, and the other end of the gas introduction branch pipe is fixed to the first pipeline but is not in communication with the first pipeline, and the gas introduction main pipe is used to send the first gas to the gas introduction branch pipe.

18. The immersion-type membrane filtration apparatus according to claim 15, characterized in that both the first pipeline and the second pipeline are main pipelines for generated water, one end of the generated water branch pipe is connected to the first pipeline, the other end of the generated water branch pipe is connected to the second pipeline, and both ends of the gas introduction branch pipe are fixed to the first pipeline and the second pipeline, respectively, but do not communicate with the first pipeline and the second pipeline.

19. The immersion membrane filtration apparatus according to claim 15, wherein the connecting pipeline further includes a third pipeline (630) fixed to the frame and extending in a direction parallel to the first direction, the third pipeline being a gas introduction main pipeline, positioned above the gas introduction branch pipeline, and communicating with the gas introduction branch pipeline.

20. The immersion-type membrane filtration apparatus according to claim 11, wherein the T-shaped pipe for generated water includes a first generated water main pipe (411) and two first generated water branch pipes (412), the two first generated water branch pipes being spaced apart on the wall of the first generated water main pipe and communicating with the first generated water main pipe.

21. The immersion-type membrane filtration apparatus according to claim 11, characterized in that the membrane elements include an upper end cover (211), a hollow fiber membrane (212), and an aeration device (213) according to any one of claims 1 to 7, arranged in sequence.

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