Aeration device for reducing cleaning period of immersed hollow fiber curtain type membrane module

Abstract

The utility model relates to the field of sewage treatment, in particular to an aeration device capable of reducing the cleaning period of an immersed hollow fiber curtain type membrane component, which adjusts the air volume output from aeration holes by adjusting the positions and the hole diameters of the aeration holes on aeration branch pipes, and adds plug aeration holes at intervals to reduce the cleaning period of the immersed hollow fiber curtain type membrane component. Different aeration angles are utilized to push water flow to fluctuate, so that the membrane is driven to shake, sludge is prevented from being accumulated on the surface of the membrane or between membrane filaments on the membrane, the hardening probability of the membrane is reduced, and the cleaning period of the immersed hollow fiber curtain type membrane module is shortened.

Description

Technical Field

[0001] The utility model relates to the field of sewage treatment, in particular to an aeration device for reducing the cleaning cycle of an immersed hollow fiber curtain membrane component. Background Art

[0002] Membrane Bio-Reactor (MBR) is a high-efficiency wastewater treatment system that combines membrane separation technology and biological treatment technology. It uses membrane components to replace traditional secondary sedimentation tanks to achieve solid-liquid separation while maintaining high activated sludge concentration, increasing the organic load of biological treatment, reducing the footprint of sewage treatment facilities, and reducing the amount of residual sludge by maintaining a low sludge load.

[0003] As a major application of MBR membrane technology, the submerged hollow fiber curtain membrane module is composed of a large number of hollow fiber membrane filaments, which are arranged in sequence to form a curtain-like structure. Its working principle is based on membrane separation technology. Impurities and pollutants in the liquid are filtered and separated through the microporous structure of the membrane. The submerged design allows the membrane module to be directly immersed in the treated liquid, which can effectively improve the filtration efficiency and treatment capacity. At the same time, it occupies a relatively small area and is relatively easy to install and maintain.

[0004] In order to ensure the sewage treatment effect of the submerged hollow fiber curtain membrane assembly, the submerged hollow fiber curtain membrane assembly needs to be cleaned regularly. However, if the cleaning frequency is too high, it will not only increase the operating cost, but also cause the membrane fibers of the submerged hollow fiber curtain membrane assembly to break or be damaged, causing damage. If the cleaning frequency is too low, pollutants will accumulate and affect the performance of the membrane assembly, and may also cause blockage of the channels inside the membrane fibers, requiring the membrane assembly to be replaced in advance, increasing operating costs.

[0005] Based on a comprehensive analysis of a large number of cases in which submerged hollow fiber curtain membrane modules are actually used in sewage treatment, it was found that the aeration device used in conjunction with the submerged hollow fiber curtain membrane modules will directly affect the cleaning frequency of the membrane modules. Due to unreasonable aeration methods, the sludge in the membrane modules may become severely compacted and the water flux may decrease rapidly, which requires increasing the frequency of offline cleaning of the submerged hollow fiber curtain membrane modules. Frequent cleaning processes shorten the service life of the membrane modules, which not only affects the normal treatment frequency of the sewage treatment plant, but also increases the cost of sewage treatment.

[0006] As disclosed in Patent CN105293687A, an aeration device for a high-concentration suspended solid submerged membrane module is provided. Aeration holes are provided on the aeration pipes, and the opening angles of the aeration holes on all the aeration pipes are 45° downward horizontally, which improves the surface fluctuation of the membrane filaments inside the membrane module, thereby avoiding the problem of suspended solid caking at both ends and in the middle of the membrane curtain. However, since the membrane curtain is fixed to the membrane module bracket, under such an angle design, aeration cannot completely blow to the membrane module, and such a design will cause waste of the air volume blown out from each aeration pipe and cannot be fully and effectively utilized.

[0007] Therefore, there is an urgent need for an aeration device that can reduce the cleaning cycle of the submerged hollow fiber curtain membrane module. By adjusting the aeration method of the aeration device, the accumulation of pollutants on the membrane module is reduced, thereby reducing the offline cleaning frequency of the membrane module. Summary of the Utility Model

[0008] To solve the problems mentioned in the background art and overcome the above deficiencies, the present utility model provides the following technical solutions:

[0009] An aeration device for reducing the cleaning cycle of a submerged hollow fiber curtain membrane module, the aeration device is used in combination with the submerged hollow fiber curtain membrane module, and the submerged hollow fiber curtain membrane module is a membrane module composed of membrane sheets and a membrane module bracket, and the aeration device is arranged at the bottom of the membrane module bracket.

[0010] The aeration device is composed of a main aeration pipe and aeration branch pipes, and a plurality of aeration branch pipes are provided on each main aeration pipe;

[0011] Further, the main aeration pipe is horizontally arranged at the bottom of each group of membrane module brackets, the main aeration pipe is made of UPVC material, and the inner diameter of the main aeration pipe is 100 mm.

[0012] The aeration branch pipes are arranged side by side in the middle of the main aeration pipe and communicate with the main aeration pipe. The position where the aeration branch pipes are arranged corresponds to the position of the membrane sheets in the submerged hollow fiber curtain membrane module. The membrane sheets are fixed to the membrane module bracket, and the fixed position of the aeration branch pipes corresponds to the gaps between the membrane sheets;

[0013] Further, the material of the aeration branch pipes is UPVC material, and the inner diameter of the aeration branch pipes is 25 mm;

[0014] Further, a plurality of aeration holes are provided on the pipe body of the aeration branch pipe, the opening direction of the aeration holes, that is, the aeration direction, is towards the bottom of the aeration tank, the aperture of the aeration holes is 5 mm, and the distance between adjacent aeration holes is 200 mm;

[0015] Furthermore, the aeration holes on adjacent aeration branch pipes are arranged alternately in a certain order, that is, the opening positions of the aeration holes on adjacent aeration branch pipes are not aligned, and the corresponding aeration hole positions on adjacent aeration branch pipes are staggered by a certain distance. Although the opening positions of the aeration holes on adjacent two aeration branch pipes are staggered, the aeration branch pipes still maintain a certain regularity in the overall arrangement of the aeration pipeline.

[0016] Plug heads are respectively installed at both ends of the aeration branch pipes. The aeration branch pipes are arranged in sequence, and the plug heads on the aeration branch pipes are opened in an interval manner to form plug head aeration holes. That is, among the neatly arranged adjacent aeration branch pipes, one aeration branch pipe is provided with plug heads at both ends, and the other adjacent aeration branch pipe is also provided with plug heads at both ends, and holes are opened on the plug heads to make them have plug head aeration holes. Then, the other aeration branch pipe adjacent to the one with plug head aeration holes in the subsequent arrangement is still only provided with plug heads and no holes are opened, and so on.

[0017] Furthermore, the aperture of the plug head aeration hole is 8 mm, and the opening direction of the plug head aeration hole, that is, the aeration direction, is towards the bottom of the aeration tank.

[0018] One main aeration pipe and the aeration branch pipes connected thereto form a set of aeration pipelines. The aeration device is composed of several sets of aeration pipelines. Each set of aeration pipelines is provided with a separate valve. The separate valve is arranged on the main aeration pipe in each set of aeration pipelines, and the aeration flux is adjusted through the separate valve.

[0019] Each set of aeration pipelines corresponds to a set of membrane modules, and finally all the aeration pipelines form a complete aeration device.

[0020] Furthermore, the spacing between the aeration device and the membrane module is 100 - 150 mm.

[0021] Furthermore, the distance between the aeration device and the bottom of the aeration tank is 200 - 300 mm.

[0022] After assembling the aeration pipeline and the corresponding membrane module, connect the main aeration pipe to the aeration pipeline in the aeration tank. According to needs, open the valves on each aeration pipeline and adjust the aeration volume.

[0023] In the aeration state, the aeration holes on the aeration branch pipes face different positions at the bottom of the tank, all directly towards the bottom of the aeration tank. The air coming out of the aeration holes forms a strong counteracting force with the water flow in the aeration state, driving the water flow to fluctuate, so that the membrane sheets shake under the water flow fluctuation, which can effectively prevent the sludge from accumulating on the surface of the membrane sheets or between the membrane filaments on the membrane sheets, reduce the probability of the membrane sheets becoming caked, and can effectively reduce the cleaning cycle of the immersed hollow fiber curtain type membrane module.

[0024] Meanwhile, the aeration branch pipes on the same aeration pipeline are provided with plugging aeration holes at intervals, which increases the aeration volume and also adds aeration directions at other angles, making the water flow fluctuate more. At the same time, the plugging aeration holes can also prevent the aeration holes on the pipe body of the aeration branch pipe from being blocked, affecting the aeration efficiency.

[0025] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0026] By arranging aeration holes and adding plugging aeration holes on the aeration branch pipes, the aeration volume of the aeration branch pipes in different positions can be increased. The positions of the aeration holes and the plugging aeration holes on the aeration branch pipes are different, and the wind blown from multiple angles in the aeration pipe can form a counterflush with the water flow in the aeration tank during the aeration process, making the water flow fluctuate. Coupled with the corresponding positions of the adjacent aeration branch pipes on both sides of a single membrane sheet of the submerged hollow fiber curtain membrane module, the membrane sheet on the submerged hollow fiber curtain membrane module can be better driven to vibrate, preventing sludge from accumulating on the surface of the membrane sheet or between the membrane filaments on the membrane sheet, reducing the probability of the membrane sheet becoming caked, and reducing the cleaning cycle of the submerged hollow fiber curtain membrane module. At the same time, the main aeration pipe and the aeration branch pipes are grouped and allocated corresponding to the submerged hollow fiber curtain membrane module, which is convenient for maintenance and repair. A separate valve is provided on the main aeration pipe of each group, and the aeration volume of each group can be regulated separately, avoiding waste of air volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic structural diagram of the aeration device for reducing the cleaning cycle of the submerged hollow fiber curtain membrane module of the present utility model;

[0028] Figure 2 It is a schematic diagram of the arrangement mode of the aeration holes and the plugging aeration holes of the aeration device for reducing the cleaning cycle of the submerged hollow fiber curtain membrane module of the present utility model;

[0029] 1 - membrane module support, 2 - main aeration pipe, 3 - aeration branch pipe, 31 - aeration hole, 32 - plugging aeration hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0031] It should be noted that, without conflict, the embodiments and the features in the embodiments of the present invention can be combined with each other.

[0032] Embodiment 1

[0033] As Figure 1 shown, the figure is a schematic structural diagram of the aeration device for reducing the cleaning cycle of the immersed hollow fiber curtain membrane module of the present utility model. In the figure, there are two groups of aeration pipelines, which are respectively fixed at the bottom of two groups of membrane module brackets 1. The distance between the aeration pipeline and the membrane module is 100 - 150 mm; the distance between the aeration pipeline and the bottom of the aeration tank is 200 - 300 mm.

[0034] Each group of aeration pipelines includes a main aeration pipe 2, and also includes a number of aeration branch pipes 3 arranged on the main aeration pipe 2. A separate valve is provided on the main aeration pipe 2 in each group of aeration pipelines, and the aeration flux is adjusted through the valve.

[0035] The main aeration pipe 2 is horizontally placed at the bottom of the membrane module bracket. The main aeration pipe 2 is made of UPVC material, and the inner diameter of the main aeration pipe is 100 mm; the aeration branch pipes 3 are arranged side by side in the middle of the main aeration pipe 2 and communicate with the main aeration pipe 2. The positions of the aeration branch pipes 3 correspond to both sides of the membrane sheets fixed on the membrane module bracket. The aeration branch pipes 3 are made of UPVC material, and the inner diameter of the aeration branch pipes 3 is 25 mm.

[0036] As Figure 2 shown, a number of aeration holes 31 are provided on the aeration branch pipe 3. The positions of the aeration holes 31 on adjacent aeration branch pipes 3 are alternately arranged in a certain order. The aeration holes 31 are provided at the bottom of the aeration branch pipe 3, and the aeration direction of the aeration holes 31 is towards the bottom of the aeration tank.

[0037] For example, in Figure 2 , in the order from left to right, there are two aeration holes 31 on the first aeration branch pipe 3, and the distance between the two aeration holes 31 is 200 mm. There are three aeration holes 31 on the second aeration branch pipe 3 adjacent to the first aeration branch pipe 3. The distance between adjacent aeration holes 31 on the second aeration branch pipe 3 is 200 mm. The positions of the aeration holes 31 on the second aeration branch pipe 3 correspond to the positions between adjacent two aeration holes 31 on the first aeration branch pipe 3 and the positions at both ends where no aeration holes 31 are provided. The aeration branch pipes 3 are arranged in sequence according to such an opening sequence.

[0038] Both ends of the aeration branch pipe 23 are also provided with aeration plugs, and some aeration branch pipes 3 are also provided with plug aeration holes 32: the plugs on the aeration branch pipes 3 are opened at intervals for adjacent aeration branch pipes 3 to form plug aeration holes 32. As Figure 2 shown, one of the adjacent aeration branch pipes 3 is opened on the plug to make it have a plug aeration hole 32, and the other adjacent aeration branch pipe 3 only has a plug and is not opened. And so on;

[0039] The aperture of the plug aeration hole 32 is 8 mm, facing the bottom of the aeration tank.

[0040] During operation, the main aeration pipe 2 is connected to the aeration pipes in the aeration tank. Under the aeration state, the aeration holes 31 on the aeration branch pipes 3 face the bottom of the tank for aeration. Since the aeration holes 31 are provided on the aeration branch pipes 3 and the positions of the aeration holes 31 on adjacent aeration branch pipes 3 are different and arranged alternately, the aeration holes 31 can perform multi-directional aeration. Therefore, the air coming out of the aeration holes 31 at different positions can form a countercurrent with the water flow, driving the water flow to fluctuate. As a result, the diaphragm vibrates under the water flow fluctuation, which can effectively prevent sludge from accumulating on the surface of the diaphragm or between the membrane filaments on the diaphragm, reduce the probability of the diaphragm becoming caked, and effectively reduce the cleaning cycle of the immersed hollow fiber curtain membrane module.

[0041] The plug aeration holes 32 are arranged at intervals on the aeration branch pipes 3 on the same aeration pipeline, increasing the aeration volume and adding aeration directions at other angles, making the water flow fluctuate more. At the same time, the plug aeration holes 32 can also prevent the aeration holes 31 on the pipe body of the aeration branch pipe 3 from being blocked, affecting the aeration efficiency.

[0042] A separate valve is provided on the main aeration pipe 1 of each group of aeration pipelines. After the aeration pipes in the aeration tank are opened, the aeration volume of the main aeration pipe 1 can still be adjusted through the separate valves in different groups.

[0043] Embodiment 2

[0044] As Figure 1 shown, it is a schematic structural diagram of the aeration device for reducing the cleaning cycle of the immersed hollow fiber curtain membrane module of the present invention. In the figure, there are two groups of aeration pipelines, which are respectively fixed at the bottom of two groups of membrane module supports 1. The distance between the aeration pipeline and the membrane module is 100 - 150 mm; the distance between the aeration pipeline and the bottom of the aeration tank is 200 - 300 mm.

[0045] Each group of aeration pipelines includes a main aeration pipe 2, and also includes several aeration branch pipes 3 arranged on the main aeration pipe 2. Each group of aeration pipelines is provided with a separate valve, and the aeration flux is adjusted through the valve.

[0046] The main aeration pipe 2 is horizontally placed at the bottom of the membrane module support. The main aeration pipe 2 is made of UPVC material, and the inner diameter of the main aeration pipe is 100 mm; the aeration branch pipes 3 are arranged side by side in the middle of the main aeration pipe 2 and communicate with the main aeration pipe 2. The positions of the aeration branch pipes 3 correspond to both sides of the diaphragm fixed on the membrane module support. The aeration branch pipes 3 are made of UPVC material, and the inner diameter of the aeration branch pipes 3 is 25 mm.

[0047] A number of aeration holes 31 are provided on the aeration branch pipe 3, and some aeration branch pipes 3 are also provided with plug aeration holes 32.

[0048] In the original aeration device, the aeration branch pipe 3 is provided with aeration holes with an aperture of 2 mm and an inclination angle of 45 degrees downward. An elbow is added at the end, and the elbow is a UPVC pipe with a diameter of 20 mm. Since the aeration direction of the 2-mm aeration holes is 45 degrees downward, it is difficult to make the diaphragm vibrate in water.

[0049] On this basis, the original aeration branch pipe 3 can be improved. The aeration holes with an aperture of 2 mm and an inclination angle of 45 degrees downward on the original aeration branch pipe 3 are retained, and aeration holes 31 with an aperture of 5 mm facing the bottom of the aeration tank are added at the bottom of the aeration branch pipe 3. The distance between adjacent 5-mm aeration holes 31 is 200 mm. The positions of the aeration holes 31 on adjacent aeration branch pipes 3 are arranged alternately in a certain order.

[0050] Alternatively, according to the actual situation, after blocking the original 2-mm aeration holes, aeration holes 31 with an aperture of 5 mm inclined toward the bottom of the aeration tank are opened. The distance between adjacent 5-mm aeration holes 31 is 200 mm. The positions of the aeration holes 31 on adjacent aeration branch pipes 3 are arranged alternately in a certain order.

[0051] And the end elbow on the original aeration branch pipe 3 is changed to a plug. Adjacent aeration branch pipes 3 are used to open holes in the plugs on the aeration branch pipes 3 at intervals to form plug aeration holes 32. As Figure 2 shown, one of the adjacent aeration branch pipes 3 has a hole opened in the plug to make it have a plug aeration hole 32, and the other adjacent aeration branch pipe 3 only has a plug and no hole is opened, and so on. The aperture of the plug aeration hole 32 is 8 mm and faces the bottom of the aeration tank.

[0052] During the operation process, the main aeration pipe 2 is connected to the aeration pipe in the aeration tank. In the aeration state, the aeration holes 31 on the aeration branch pipe 3 face the bottom of the tank for aeration. The air coming out of the aeration holes 31 at different positions forms a countercurrent with the water flow. If the original 2-mm aeration holes are retained, due to their setting angle, the 2-mm aeration holes have a poor effect on driving the diaphragm to vibrate, but they can also provide more angles for promoting the water flow fluctuation. Under the dual action of the aeration holes 31 and the 2-mm aeration holes, the diaphragm vibrates in the water flow, which can effectively prevent sludge from accumulating on the surface of the diaphragm or between the membrane filaments on the diaphragm, reduce the probability of the diaphragm becoming caked, and effectively reduce the cleaning cycle of the submerged hollow fiber curtain type membrane module.

[0053] On the aeration branch pipe 3 on the same aeration pipeline, plug aeration holes 32 are arranged at intervals, which increases the aeration volume and also adds the aeration direction at other angles, making the water flow fluctuate more. At the same time, the plug aeration holes 32 can also prevent the aeration holes 31 on the pipe body of the aeration branch pipe 3 from being blocked, which affects the aeration efficiency.

[0054] A separate valve is provided on the main aeration pipe 1 of each group of aeration pipelines. After the aeration pipes in the aeration tank are opened, the aeration volume of the main aeration pipe 1 can still be adjusted through the separate valves in different groups.

[0055] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. An aeration device for reducing the cleaning cycle of an immersed hollow fiber curtain membrane module, the immersed hollow fiber curtain membrane module comprising a membrane sheet and a membrane module bracket (1) for fixing the membrane sheet, the aeration device being arranged at the bottom of the membrane module bracket (1), characterized in that, The aeration device is composed of a main aeration pipe (2) and aeration branch pipes (3) arranged on the main aeration pipe (2). The pipe body of the aeration branch pipe (3) is provided with aeration holes (31), and the aeration holes (31) are arranged staggeredly on adjacent aeration branch pipes (3); both ends of the aeration branch pipe (3) are provided with plugs, and adjacent aeration branch pipes (3) are provided with plug aeration holes (32) on the plugs at intervals.

2. The aeration device for reducing the cleaning cycle of the immersed hollow fiber curtain membrane module according to claim 1, wherein The opening direction of the aeration hole (31) is towards the bottom of the aeration tank, the aperture of the aeration hole (31) is 5 mm, and the distance between adjacent aeration holes (31) is 200 mm.

3. The aeration device for reducing the cleaning cycle of the submerged hollow fiber curtain membrane module according to claim 1, characterized in that, The aperture of the plug aeration hole (32) is 8 mm, and the plug aeration hole (32) faces the bottom of the aeration tank.

4. The aeration device for reducing the cleaning cycle of the submerged hollow fiber curtain membrane module according to claim 1, characterized in that, The main aeration pipe (2) is horizontally arranged at the bottom of the membrane module support (1), and the aeration branch pipes (3) are arranged side by side in the middle of the main aeration pipe (2) and communicate with the main aeration pipe (2); a separate valve is provided on the main aeration pipe (2).

5. The aeration device for reducing the cleaning cycle of the submerged hollow fiber curtain membrane module according to claim 4, wherein, The main aeration pipe (2) is horizontally arranged at the bottom of each group of membrane module supports. The main aeration pipe (2) is made of UPVC, and the inner diameter of the main aeration pipe (2) is 100 mm.

6. The aeration device for reducing the cleaning cycle of the immersed hollow fiber curtain membrane module according to claim 4, characterized in that, The material of the aeration branch pipe (3) is UPVC, and the inner diameter of the aeration branch pipe (3) is 25 mm.

7. The aeration device for reducing the cleaning cycle of the immersed hollow fiber curtain membrane module according to claim 6, characterized in that, The membrane sheets of the submerged hollow fiber curtain type membrane module are fixed on the membrane module support (1), and the fixing position of the aeration branch pipe (3) corresponds to the gap between the membrane sheets.

8. The aeration device for reducing the cleaning cycle of the immersed hollow fiber curtain membrane module according to claim 1, wherein, The distance between the aeration device and the membrane module is 100 - 150 mm; the distance between the aeration device and the bottom of the aeration tank is 200 - 300 mm.

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