Sewage treatment mechanism and sewage treatment device

Abstract

The utility model discloses a sewage treatment mechanism and a sewage treatment device, the sewage treatment mechanism comprises a support frame, and a biological membrane treatment assembly, an MABR membrane purification assembly and a suspension assembly which are respectively arranged on the support frame, and the suspension assembly is used for enabling the sewage treatment mechanism to suspend in water; the MABR membrane purification assembly comprises a first MABR aeration membrane and a second MABR aeration membrane, a first air hole with a first aperture is formed in the first MABR aeration membrane, a second air hole with a second aperture is formed in the second MABR aeration membrane, and the first aperture is larger than the second aperture; the utility model further discloses a sewage treatment device comprising the sewage treatment mechanism. The sewage treatment mechanism disclosed by the utility model can form synchronous nitrification and denitrification effects, can degrade pollutants such as COD (Chemical Oxygen Demand), total nitrogen and the like under the synchronous action of the biological membrane, and can suspend the whole structure in water without being influenced by the change of the liquid level of the water, so that the use efficiency of the two membrane components is greatly improved.

Description

Technical Field

[0001] The utility model relates to the field of sewage treatment, in particular to a sewage treatment mechanism and a sewage treatment device. Background Art

[0002] According to conventional sewage treatment methods, sewage treatment equipment is built off-site in polluted rivers to purify and replace polluted water. However, due to restrictions on conditions, land acquisition, electricity consumption, surrounding environment and other factors, off-site treatment is generally difficult to achieve results, and many integrated devices are basically abandoned. Therefore, existing river management technologies use in-situ treatment methods or interception and construction of wetland management plans, specifically using surface aeration, ecological floating islands, submerged plants, and the addition of bacterial agents to comprehensively manage polluted rivers. However, these technologies are relatively traditional, plants and floating islands are greatly affected by seasonality, bacterial agents are easily lost, and surface aeration equipment has a high failure rate. At the same time, these traditional technologies only have a certain degree of removal of organic matter such as ammonia nitrogen and CODcr, but the removal effect of total nitrogen is poor. Utility Model Content

[0003] The purpose of the utility model is to overcome one or more deficiencies in the prior art and provide an improved sewage treatment mechanism.

[0004] The utility model also provides a sewage treatment device comprising the sewage treatment mechanism.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solution:

[0006] A sewage treatment mechanism comprises a support frame and a biofilm treatment component, a MABR membrane purification component and a suspension component respectively arranged on the support frame, wherein the suspension component is used to suspend the sewage treatment mechanism in water; the MABR membrane purification component comprises a first MABR aeration membrane and a second MABR aeration membrane, wherein the first MABR aeration membrane is provided with a first pore with a first aperture, and the second MABR aeration membrane is provided with a second pore with a second aperture, and the first aperture is larger than the second aperture.

[0007] According to some preferred aspects of the present invention, the first MABR aeration membrane and the second MABR aeration membrane each have a plurality of membranes, and are arranged in sequence according to the following order:

[0008] a the second MABR aeration membrane, b the first MABR aeration membrane, c the second MABR aeration membrane;

[0009] a and c are greater than or equal to 1 respectively, and b is greater than or equal to 2.

[0010] Furthermore, the arrangement direction is horizontal.

[0011] Further, the set ratio of the sum of a and c to b is 1:1.5 - 5, and for example, it can be 1:1.5, 1:2, 1:2.5, 1:3, 1:3.5, 1:4, 1:4.5, 1:5, etc.

[0012] According to some preferred aspects of the present utility model, the first pore diameter is 1 - 8 microns, and the second pore diameter is 1 - 6 nanometers.

[0013] According to some preferred aspects of the present utility model, the biofilm treatment assembly includes an environment-friendly biofill that can self-release a carbon source. Among them, the "environment-friendly biofill that can self-release a carbon source" can be a commercially available product, or it can be the self-releasing carbon source and biodegradable environment-friendly fill in Patent CN218435240U. It can release a carbon source, provide a carbon source for the denitrification reaction, and thus can better remove pollutants such as total nitrogen.

[0014] According to some preferred aspects of the present utility model, the MABR membrane purification assembly further includes an aeration main pipe, an aeration connecting pipe communicated with the aeration main pipe, and an aeration branch pipe communicated with the aeration connecting pipe. The first MABR aeration membrane and the second MABR aeration membrane are respectively communicated with the aeration branch pipe;

[0015] Taking the connection point of the aeration connecting pipe and the aeration branch pipe as the origin, the length from the connection point of the first MABR aeration membrane and the aeration branch pipe to the origin is L1, and the length from the connection point of the second MABR aeration membrane and the aeration branch pipe to the origin is L2, and L2 is greater than L1.

[0016] According to some preferred aspects of the present utility model, there are multiple aeration branch pipes that are interconnected and enclose a rectangle. The first MABR aeration membrane and the second MABR aeration membrane are arranged in parallel, and the length directions of both are parallel to the width direction of the rectangle, and the width directions of both are parallel to the length direction of the rectangle. The extending direction of the aeration connecting pipe is perpendicular to the plane where the rectangle is located.

[0017] According to some preferred aspects of the present utility model, the biofilm treatment assembly is located above the MABR membrane purification assembly.

[0018] According to some preferred aspects of the present utility model, the suspension assembly is arranged at the top of the support frame. The suspension assembly includes multiple floating cylinders, and all of the multiple floating cylinders are located above the biofilm treatment assembly.

[0019] According to some preferred aspects of the present utility model, the biofilm treatment assembly includes a plurality of biofilm fillers arranged in parallel. The diameter of the biofilm filler is 50 - 80 mm, the height is less than 4 m, and the distance between two adjacent biofilm fillers is 80 - 150 mm.

[0020] According to some preferred aspects of the present utility model, the sewage treatment mechanism further includes a limiting assembly for restricting the support frame within a preset area, and at least part of the limiting assembly is disposed on the support frame.

[0021] Another technical solution provided by the present utility model: A sewage treatment device, which includes the above-mentioned sewage treatment mechanism.

[0022] According to some preferred aspects of the present utility model, there are multiple sewage treatment mechanisms and they are distributed in an array.

[0023] Due to the application of the above technical solution, the present utility model has the following advantages compared with the prior art:

[0024] Based on the problems existing in the existing sewage treatment, such as poor removal effect of total nitrogen, the present utility model innovatively provides a sewage treatment mechanism that can realize in-situ restoration of river water bodies in natural water bodies. It combines two types of membranes, namely biofilm and MABR membrane, to treat polluted river bodies. In particular, by setting MABR aeration membranes with two different pore sizes, aerobic and anoxic membrane layers are formed through the difference in aeration degree of different pore sizes. Then, through gas-water exchange in water, simultaneous nitrification and denitrification can be achieved to degrade COD and total nitrogen. At the same time, under the simultaneous action of the biofilm, pollutants such as ammonia nitrogen, total nitrogen, and organic matters such as CODcr can be further removed. In addition, under the action of the suspension assembly of the present utility model, the biofilm treatment assembly and the MABR membrane purification assembly can be suspended in water, without being affected by the change of water level, greatly improving the use efficiency of the above two types of membrane assemblies. Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0026] Figure 1 It is a schematic structural diagram of the sewage treatment mechanism of the present utility model;

[0027] Figure 2 It is a schematic structural diagram of the sewage treatment mechanism of the present utility model with some components omitted;

[0028] Figure 3 This is a top view schematic diagram of the biofilm treatment component in the sewage treatment mechanism of the present utility model;

[0029] Figure 4 This is a top view schematic diagram of the MABR membrane purification component in the sewage treatment mechanism of the present utility model;

[0030] Figure 5 This is a structural schematic diagram of the sewage treatment device of the present utility model;

[0031] In the attached drawing reference numerals: 1, support frame; 11, upper layer fixed support; 12, middle layer fixed support; 13, lower layer fixed support; 14, connection hole; 2, biofilm treatment component; 21, biofilm filler; 22, biofilm filler fixing frame; 3, MABR membrane purification component; 31, first MABR aeration membrane; 32, second MABR aeration membrane; 33, aeration connecting pipe; 34, aeration branch pipe; 4, suspension component; 41, floating cylinder; 42, floating cylinder fixing frame. Detailed implementation manners

[0032] Chemical Oxygen Demand (COD) is the amount of reducible substances that need to be oxidized in a water sample measured by chemical methods. In wastewater, effluent from wastewater treatment plants, and polluted water, it is the oxygen equivalent of substances (generally organic matter) that can be oxidized by strong oxidants. In the study of river pollution and the properties of industrial wastewater, as well as the operation and management of wastewater treatment plants, it is an important and quickly measurable organic pollution parameter, often represented by the symbol COD.

[0033] Total nitrogen, abbreviated as TN, the total nitrogen content in water is one of the important indicators for measuring water quality. The definition of total nitrogen is the total amount of various forms of inorganic and organic nitrogen in water. It includes inorganic nitrogen such as NO3 - , NO2 - and NH4 + and other inorganic nitrogen and organic nitrogen such as proteins, amino acids, and organic amines, calculated in milligrams of nitrogen per liter of water. It is often used to represent the degree of water body pollution by nutrients.

[0034] CODcr is the chemical oxygen demand measured using potassium dichromate (K2Cr2O7) as the oxidant, that is, the dichromate index. The dichromate index is the dichromate value, also known as dichromate oxidizability or dichromate oxygen demand, denoted as CODCr. It is the chemical oxygen demand of water measured with potassium dichromate as the oxidant using standard procedures. An excess of potassium dichromate solution and sulfuric acid are added to the water sample, heated, and silver sulfate is used as a catalyst to promote the completion of the oxidation reaction. The excess potassium dichromate is titrated back with a standard ferrous sulfate solution using ferroin as the indicator, and then the consumption of potassium dichromate is converted to milligrams of oxygen consumed per liter of water. This method has a high degree of oxidation and can be used to analyze severely polluted industrial wastewater to illustrate the situation of wastewater pollution by organic matter.

[0035] To make the above objects, features, and advantages of the present utility model more obvious and understandable, the following will describe the present utility model in detail with reference to the accompanying drawings and specific embodiments. Many specific details are set forth in the following description to facilitate a full understanding of the present utility model. However, the present utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed below.

[0036] In the description of the present utility model, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0037] In the present utility model, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over", and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below", and "beneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0038] The following will describe in detail the preferred embodiments of the present utility model with reference to the accompanying drawings.

[0039] Example 1:

[0040] See Figures 1 to 4As shown, this example provides a sewage treatment mechanism, which includes a support frame 1, a biofilm treatment component 2, a MABR membrane purification component 3, and a suspension component 4 that are respectively arranged on the support frame 1. The suspension component 4 is used to suspend the sewage treatment mechanism in water; the MABR membrane purification component 3 includes a first MABR aeration membrane 31 and a second MABR aeration membrane 32. A first air hole with a first pore diameter (not shown, the formation method of the air hole is a conventional method and will not be specifically described here) is provided on the first MABR aeration membrane 31, and a second air hole with a second pore diameter is provided on the second MABR aeration membrane 32. The first pore diameter is larger than the second pore diameter.

[0041] In this example, there are multiple first MABR aeration membranes 31 and second MABR aeration membranes 32 respectively, and they are arranged in sequence as follows: a second MABR aeration membranes 31, b first MABR aeration membranes 32, c second MABR aeration membranes 31; a and c are respectively greater than or equal to 1, and b is greater than or equal to 2. Such an arrangement is beneficial to form an aerobic layer in the inner layer and an anoxic layer in the outer layer. Through gas-water exchange, simultaneous nitrification and denitrification are formed to degrade COD and TN.

[0042] Furthermore, the arrangement direction of the foregoing multiple first MABR aeration membranes 31 and second MABR aeration membranes 32 is the horizontal direction. At the same time, the setting ratio of the sum of a and c to b is 1:1.5 - 5. For example, it can be 1:1.5, 1:2, 1:2.5, 1:3, 1:3.5, 1:4, 1:4.5, 1:5, etc. In this example, the setting ratio of the sum of a and c to b can be 1:2, a and c are both 1, and b is 4.

[0043] In this example, the first pore diameter is 1 - 8 microns. The micron-level pore diameter can generate bubbles in water when ventilating and supplying oxygen. For example, nanoscale bubbles can be formed, and the effective utilization rate of dissolved oxygen is high. The second pore diameter is 1 - 6 nanometers. This type of air hole enables only a small amount of tiny bubbles to be generated on the membrane surface.

[0044] In this example, the MABR membrane purification component 3 further includes an aeration main pipe (not shown), an aeration connecting pipe 33 communicated with the aeration main pipe, and an aeration branch pipe 34 communicated with the aeration connecting pipe 33. The first MABR aeration membrane 31 and the second MABR aeration membrane 32 are respectively communicated with the aeration branch pipe 34. Taking the connection point of the aeration connecting pipe 33 and the aeration branch pipe 34 as the origin, the length from the connection point of the first MABR aeration membrane 31 and the aeration branch pipe 34 to the origin is L1, and the length from the connection point of the second MABR aeration membrane 32 and the aeration branch pipe 34 to the origin is L2. L2 is greater than L1, so that it is beneficial to form an aerobic layer in the inner layer and an anoxic layer in the outer layer. There are multiple aeration branch pipes 34 that are interconnected and enclose a rectangle, actually forming a rectangular loop. The first MABR aeration membrane 31 and the second MABR aeration membrane 32 are arranged in parallel, and the length directions of both are parallel to the width direction of the rectangle, and the width directions of both are parallel to the length direction of the rectangle. The extending direction of the aeration connecting pipe 33 is perpendicular to the plane where the rectangle is located. In this example, the lengths of the first MABR aeration membrane 31 and the second MABR aeration membrane 32 are set to be 2 - 2.5 meters, and the installation distance between adjacent two membranes can be 200 - 400 millimeters. The MABR aeration membrane can be prepared from a material with a filament breaking tensile force ≥ 2500 cN.

[0045] Furthermore, the aeration main pipe, the aeration connecting pipe 33, and the aeration branch pipe 34 can all be UPVC pipe fittings. The aeration main pipe can be connected and communicated with a blower, and air (such as air) can be introduced into the aeration connecting pipe 33 through some hoses. The blower can be fixed on the shore or float in the river.

[0046] In this example, the biological membrane treatment component 2 includes a plurality of biologically membrane fillers 21 arranged in parallel. The diameter of the biologically membrane filler 21 is 50 - 80 millimeters and the height is less than 4 meters, for example, it can be 2.5 - 3.5 meters, and the distance between adjacent two biologically membrane fillers 21 is 80 - 150 millimeters. Further, the biologically membrane filler 21 can be an environment-friendly biological filler that self-releases carbon sources. Among them, the "environment-friendly biological filler that self-releases carbon sources" can be a commercially available product or the self-releasing carbon source and biodegradable environment-friendly filler in Patent CN218435240U. It can release carbon sources, provide carbon sources for denitrification reactions, and thus can better remove pollutants such as total nitrogen. Specifically, through the action of microorganisms on the biologically membrane filler, nitrification and denitrification reactions are formed to remove organic matters such as ammonia nitrogen, total nitrogen, and CODcr. In other cases, other types of biological fillers can also be used for the biological membrane treatment component.

[0047] See Figures 1-4As shown, the support frame 1 includes an upper fixed frame 11, a middle fixed frame 12, and a lower fixed frame 13. The support frame 1 is also provided with a connection hole 14, and the connection hole 14 can be used to connect two support frames 1 together by bolts, etc., so that multiple sewage treatment mechanisms can be connected in parallel, which can enhance the treatment capacity of the water body;

[0048] In this example, the biofilm treatment component 2 is located above the MABR membrane purification component 3; the suspension component 4 is arranged on the top of the support frame 1, that is, the suspension component 4, the biofilm treatment component 2, and the MABR membrane purification component 3 are arranged in sequence from top to bottom, wherein the biofilm filler 21 is arranged between the middle-layer fixed support 12 and the upper-layer fixed support 11, and the upper and lower ends of the biofilm filler 21 are fixed to the middle-layer fixed support 12 and the upper-layer fixed support 11 through the biofilm filler fixing frame 22;

[0049] Furthermore, the suspension component 4 includes a plurality of floats 41, which are all located above the biofilm treatment component 2. The floats 41 are fixed to the upper fixed bracket 11 of the support frame 1 through a float fixing frame 42. In actual operation, an anti-ultraviolet film can be coated on the outer surface of the float 41 to improve weather resistance.

[0050] In this example, at least two symmetrical floats 41 are provided to help maintain balance. Through the buoyancy, the entire mechanism always floats in the water and is not affected by changes in the liquid level to affect its use effect.

[0051] In this example, the sewage treatment mechanism also includes a limiting component for limiting the support frame 1 to a preset area. The limiting component is at least partially arranged on the support frame 1. The limiting component can be fixed by fixed piles, fixed anchors (such as iron anchors), concrete blocks, etc., or by ropes such as nylon ropes, so as to limit the sewage treatment mechanism to a preset treatment water body area so that it will not flow away, move or tip over due to scouring.

[0052] Furthermore, this example also provides a sewage treatment device, which includes the above-mentioned sewage treatment mechanism, and the sewage treatment mechanism has multiple and array-distributed, forming a matrix structure; see Figure 5 As shown, every two buoys 41 represent a sewage treatment mechanism. Figure 5 A schematic diagram of a sewage treatment device in which four sewage treatment mechanisms are connected in a matrix structure is given as an example.

[0053] Embodiment 2:

[0054] This example provides a sewage treatment device, the sewage treatment device includes the above-mentioned sewage treatment mechanism, the sewage treatment mechanism has multiple and is distributed in an array to form a matrix structure;

[0055] Specifically, the matrices are arranged in 2 rows, with 20 sewage treatment institutions in each matrix. The specifications of the sewage treatment institutions are 1.8m×2m×2m, the packing layer height is 1.5m, and they are connected to submerged water pumps and arranged along the river in the direction of the water flow. The river is 10m wide and 5km long in total. One set of matrices is set every 50m, and one row of matrices is set on each side of the river bank. The biofilm packing uses bionic waterweed packing, combined with the MABR aeration membrane, to remove pollutants, and can treat the river water from inferior class V to class III water.

[0056] Example 3:

[0057] In this example, a sewage treatment device is provided. The sewage treatment device includes the above-mentioned sewage treatment institutions. There are multiple sewage treatment institutions and they are arranged in an array to form a matrix structure;

[0058] Specifically, the matrix scale is 10×4, with 40 in each matrix, and a total of 8 groups of matrices are set at the narrow pass in the lake. A submerged blower is set beside the matrix, and the blower floats in the lake water through a floating barrel. The packing uses an environmentally friendly biological packing with self-releasing carbon source, combined with the MABR aeration membrane, to remove pollutants in the lake and improve the water quality from near class IV to class III.

[0059] Example 4:

[0060] In this example, a sewage treatment device is provided. The sewage treatment device includes the above-mentioned sewage treatment institutions. There are multiple sewage treatment institutions and they are arranged in an array to form a matrix structure;

[0061] Specifically, the matrix scale is 8×5, with 40 in each matrix. It is set at the confluence of two rivers, and a total of 4 groups are set to form an interception checkpoint. A submerged blower is set on the shore. The packing uses a high-efficiency denitrifying biofilm packing (which can be commercially obtained, for example, using the SJ type high-efficiency denitrifying packing of Sujing), combined with the MABR aeration membrane, to remove pollutants in the river section.

[0062] Example 5:

[0063] In this example, a sewage treatment device is provided. The sewage treatment device includes the above-mentioned sewage treatment institutions. There are multiple sewage treatment institutions and they are arranged in an array to form a matrix structure;

[0064] Specifically, the matrix scale is 6×20, with 120 in each matrix. It is set at the narrow pass of the river, and a total of 3 groups are set. A submerged blower is set beside the matrix. An environmentally friendly biofilm packing with self-releasing carbon source + two MABR aeration membranes (the total of a and c and the setting ratio of b is 1∶2) is used for aeration. The first pore size is about 3±1 microns, and the second pore size is about 2±1 nanometers;

[0065] Apply the sewage treatment device of this example to a river regulation project in Sichuan. For the specific results, see Table 1.

[0066] Table 1 Detection Port Data of a Project in Sichuan

[0067]

[0068] This project started commissioning in January 2024, added strains of bacteria, and passed the commissioning acceptance test in April 2024, with qualified effluent. As can be seen from Table 1, when the sewage treatment device in this example was put into the river, a substantial reduction was basically achieved within one month, and the expected goal was basically achieved within 3 months, showing relatively quick results.

[0069] Comparative Example 1:

[0070] Basically the same as Example 5, the only difference being that: both of the two MABR aeration membranes in Example 5 were replaced with UPVC perforated aeration (pore diameter 4 ± 1 mm) for a river project in Ningbo, Zhejiang.

[0071] Comparative Example 2:

[0072] Basically the same as Example 5, the only difference being that: both of the two MABR aeration membranes in Example 5 were replaced with UPVC perforated aeration (pore diameter 4 ± 1 mm) for a river project in Jiaxing, Zhejiang.

[0073] Comparative Example 3:

[0074] Basically the same as Example 5, the only difference being that: the second MABR aeration membrane 32 in Example 5 was replaced with the first MABR aeration membrane 31, that is, all MABR aeration membranes used the first MABR aeration membrane 31 for a river project in Tianchang, Anhui.

[0075] The comparison results of the organic matter removal rates of the four projects of Example 5 and Comparative Examples 1 - 3 are shown in Table 2.

[0076] Table 2

[0077]

[0078] Calculation method of removal rate: The difference obtained by subtracting the average value of the data after the effluent is qualified from the average value of the data before the sewage treatment device is put into use, and then dividing this difference by the average value of the data before the sewage treatment device is put into use.

[0079] Note: There were no requirements for the total nitrogen removal rate during the treatment of a river project in Ningbo, Zhejiang, a river project in Jiaxing, Zhejiang, and a river project in Tianchang, Anhui. After other indicators met the requirements, it was considered to achieve the goal. However, in terms of the removal effect, their removal effect on total nitrogen was relatively poor.

[0080] Comparing vertically, the Sichuan project has the best effect, and its start-up speed is fast. The Tianchang project is the second, and the Ningbo and Jiaxing projects are slightly worse. In particular, the total nitrogen (TN) removal rate of the Sichuan project is relatively high, and the effluent stably reaches below 1 mg / L.

[0081] In summary, based on the problems existing in the existing sewage treatment, such as poor removal effect of total nitrogen, the present utility model innovatively provides a sewage treatment mechanism capable of in-situ repairing river water bodies in natural water bodies. It combines two types of membranes, namely biofilm and MABR membrane, to treat polluted river bodies. In particular, by setting MABR aeration membranes with two different pore sizes, aerobic and anoxic membrane layers are formed through the difference in aeration degree of different pore sizes. Furthermore, through gas-water exchange in water, simultaneous nitrification and denitrification can be formed to degrade COD and total nitrogen. At the same time, under the simultaneous action of the biofilm, pollutants such as ammonia nitrogen, total nitrogen, and organic matters such as CODcr can be further removed. In addition, the sewage treatment mechanism of the present utility model can also, under the action of the suspension assembly, make the biofilm treatment assembly and the MABR membrane purification assembly suspended in water, not affected by the change of water level, greatly improving the use efficiency of the above two types of membrane components.

[0082] The above embodiments are only for illustrating the technical concept and characteristics of the present utility model, and the purpose is to enable those skilled in the art to understand the content of the present utility model and implement it accordingly. It should not be used to limit the protection scope of the present utility model. Any equivalent changes or modifications made according to the spirit and essence of the present utility model should be covered within the protection scope of the present utility model.

Claims

1. A sewage treatment mechanism, characterized in that, The sewage treatment mechanism includes a support frame, and a biofilm treatment component, an MABR membrane purification component, and a suspension component respectively arranged on the support frame. The suspension component is used to suspend the sewage treatment mechanism in water. The MABR membrane purification component includes a first MABR aeration membrane and a second MABR aeration membrane. The first MABR aeration membrane is provided with first air holes having a first pore diameter, and the second MABR aeration membrane is provided with second air holes having a second pore diameter. The first pore diameter is larger than the second pore diameter.

2. The sewage treatment mechanism according to claim 1, characterized in that, There are multiple first MABR aeration membranes and multiple second MABR aeration membranes respectively, and they are arranged in sequence according to the following order: a second MABR aeration membranes, b first MABR aeration membranes, c second MABR aeration membranes; a and c are respectively greater than or equal to 1, and b is greater than or equal to 2.

3. The sewage treatment mechanism according to claim 2, characterized in that, The arrangement direction is the horizontal direction; and / or, the setting ratio of the sum of a and c to b is 1∶1.5 - 5.

4. The sewage treatment mechanism according to claim 1, characterized in that The first pore diameter is 1 - 8 microns, and the second pore diameter is 1 - 6 nanometers; the biofilm treatment component includes an environment-friendly biofilm filler that releases carbon sources by itself.

5. The sewage treatment mechanism according to claim 1, characterized in that, The MABR membrane purification component further includes an aeration main pipe, an aeration connecting pipe communicated with the aeration main pipe, and an aeration branch pipe communicated with the aeration connecting pipe. The first MABR aeration membrane and the second MABR aeration membrane are respectively communicated with the aeration branch pipe; Taking the connection point of the aeration connecting pipe and the aeration branch pipe as the origin, the length from the connection point of the first MABR aeration membrane and the aeration branch pipe to the origin is L1, and the length from the connection point of the second MABR aeration membrane and the aeration branch pipe to the origin is L2, and L2 is greater than L1.

6. The sewage treatment mechanism according to claim 5, characterized in that, There are multiple aeration branch pipes that are interconnected and enclose a rectangle. The first MABR aeration membrane and the second MABR aeration membrane are arranged in parallel, and the length directions of both are parallel to the width direction of the rectangle, and the width directions of both are parallel to the length direction of the rectangle. The extending direction of the aeration connecting pipe is perpendicular to the plane where the rectangle is located.

7. The sewage treatment mechanism according to claim 1, wherein The biofilm treatment component is located above the MABR membrane purification component; and / or, the suspension component is arranged at the top of the support frame. The suspension component includes multiple floating cylinders, and all of the multiple floating cylinders are located above the biofilm treatment component.

8. The sewage treatment mechanism according to claim 1, characterized in that The biofilm treatment component includes multiple biofilm fillers arranged in parallel. The diameter of the biofilm filler is 50 - 80 millimeters and the height is less than 4 meters. The distance between adjacent two biofilm fillers is 80 - 150 millimeters; and / or, the sewage treatment mechanism further includes a limiting component for restricting the support frame in a preset area, and the limiting component is at least partially arranged on the support frame.

9. A sewage treatment device, characterized in that, The sewage treatment device includes the sewage treatment mechanism according to any one of claims 1 - 8.

10. The sewage treatment device according to claim 9, characterized in that, There are multiple sewage treatment mechanisms and they are distributed in an array.

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