Combined aeration structure of membrane bioreactor

Abstract

The utility model discloses a combined aeration structure of a membrane bioreactor. The combined aeration structure comprises a plurality of first aeration pipes and a plurality of second aeration pipes, the first aeration pipe and the second aeration pipe are paved on the bottom surface of a container of the membrane bioreactor in parallel at an interval, and are paved on planes with different heights; each of the first aeration pipe and the second aeration pipe comprises an inner pipe and an outer pipe which are concentrically arranged, and the inner pipe is a solid pipe and sleeves a rotating shaft structure driven by a motor; the outer pipe is an aeration pipe, and aeration holes are uniformly formed in the surface of the outer pipe; the first aeration pipe and the second aeration pipe are connected with different aeration main pipes between the inner pipe and the outer pipe, and are connected with an aeration control device through the aeration main pipes to supply air. According to the utility model, combined aeration and accurate regulation and control of aeration can be carried out through the first aeration pipe and the second aeration pipe, so that an efficient and uniform aeration effect is realized in the membrane bioreactor.

Description

Technical Field

[0001] The utility model relates to sewage treatment equipment, in particular to a combined aeration structure of a membrane bioreactor. Background Art

[0002] Membrane Bio-Reactor (MBR) technology is a new technology for modern sewage treatment. Compared with traditional sewage treatment processes, membrane bioreactors have the advantages of good effluent quality, small footprint, low residual sludge volume, resistance to shock loads and easy control, and have been gradually promoted and applied around the world.

[0003] During the operation of the membrane bioreactor, sludge accumulates continuously on the membrane surface, increasing the filtration resistance. Aeration is required to blow off the sludge adsorbed on the membrane surface, maintain the cleanliness of the membrane surface, and ensure the stable operation and efficient filtration performance of the membrane bioreactor. However, the traditional aeration tube structure is usually relatively simple, and during the aeration process, there are often problems such as uneven aeration and a single aeration airflow path, which leads to excessive sludge accumulation in some areas of the membrane bioreactor and excessive aeration in other areas, thus affecting the overall treatment effect and operating efficiency. In addition, during the aeration process, sludge easily enters the air pipe, and the position of the aeration pipe is relatively fixed, which can easily cause the holes to become clogged and cause deposition and compaction at the bottom of the aeration pipe, affecting the aeration effect and ultimately the overall performance of the membrane bioreactor. Utility Model Content

[0004] The technical problem solved by the present invention is to provide a combined aeration structure of a membrane bioreactor, which combines multiple aeration methods to achieve efficient and uniform aeration effects, so as to solve the defects in the above technical background.

[0005] The technical problem solved by the present invention is achieved by the following technical solutions:

[0006] A combined aeration structure of a membrane bioreactor, comprising a plurality of first aeration tubes and a plurality of second aeration tubes;

[0007] The first aeration pipe and the second aeration pipe are laid parallel and spaced apart on the bottom surface of the membrane bioreactor container, and the first aeration pipe and the second aeration pipe are laid on planes at different heights;

[0008] The first aeration pipe and the second aeration pipe each include an inner pipe and an outer pipe arranged concentrically. The inner pipe is a solid pipe and is mounted on a rotating shaft structure driven by a motor. The outer pipe is an aeration pipe with aeration holes evenly distributed on its surface. Different aeration main pipes are connected between the inner and outer pipes of the first aeration pipe and the second aeration pipe, and are connected to an aeration control device through the aeration main pipe for air supply.

[0009] As a further limitation, the first aeration tube is formed with 3 to 5 arc-shaped protrusions on the tube surface of the outer tube, and the arc-shaped protrusions are arranged in a spiral line in the length direction of the outer tube. The arc-shaped protrusions are connected to the air supply tube cavity on the inner side, and the aeration holes are formed on the arc top surfaces of the corresponding arc-shaped protrusions.

[0010] As a further limitation, the paving plane of the first aeration pipe is located above the paving plane of the second aeration pipe; the cross-sectional size of the first aeration pipe is proportionally reduced to the cross-sectional size of the second aeration pipe, and the reduction ratio is 0.6 to 0.8;

[0011] On the same aeration pipe, the outer diameter of the inner pipe is 2 / 3 to 3 / 5 of the inner diameter of the outer pipe;

[0012] The diameter of the aeration holes on the first aeration tube is smaller than the diameter of the aeration holes on the second aeration tube.

[0013] As a further limitation, the aeration holes of the first aeration tube and the second aeration tube are arranged in a staggered manner, that is, the aeration holes on the first aeration tube and the aeration holes on the second aeration tube do not completely overlap in the horizontal direction.

[0014] As a further limitation, the distance between the setting plane of the first aeration tube and the setting plane of the second aeration tube is 1 / 2 to 2 / 3 of the diameter of the outer tube of the second aeration tube; and the distance between the adjacent first aeration tube and the second aeration tube on the orthographic projection plane is 3 to 10 times the diameter of the outer tube of the second aeration tube.

[0015] As a further limitation, the first aeration pipe and the second aeration pipe arranged in the same plane are closed at one end of the pipe body, and the other end is connected in parallel to the aeration main pipe through a multi-way.

[0016] As a further limitation, the aeration holes provided on the outer tubes of the first aeration tube and the second aeration tube are preferably oblong holes or wavy holes provided along the length direction of the aeration tube.

[0017] Beneficial effect: The combined aeration structure of a membrane bioreactor of the present invention is provided with a first aeration tube and a second aeration tube, and is laid out in parallel and spaced apart on planes of different heights, and is connected to an independent aeration control device for air supply. Under low air volume conditions, only the first aeration tube or the second aeration tube can be opened, so that the first aeration tube and the second aeration tube can be independently controlled according to different aeration requirements, thereby achieving precise regulation of the aeration process. Under high air volume conditions, a uniform and three-dimensional staggered airflow disturbance can be formed in the membrane bioreactor by opening the first aeration tube and the second aeration tube at the same time and cooperating with the rotating shaft structure, thereby effectively avoiding the problems of uneven aeration and single aeration airflow path in traditional aeration methods, so that the sludge can be blown off more evenly on the membrane filament surface, reducing the accumulation of sludge on the membrane filament surface, maintaining the cleanliness of the membrane filament surface, and ensuring the stable operation and high-efficiency filtration performance of the membrane bioreactor. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the pavement configuration of a preferred embodiment of the present utility model.

[0019] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure of the first aeration tube.

[0020] Among them: 1. First aeration main pipe; 2. Second aeration main pipe; 3. First aeration pipe; 4. Bottom support; 5. Second aeration pipe; 6. Bend pipe section; 7. Membrane bioreactor bottom; 8. Aeration hole; 9. Outer pipe; 10. Air supply pipe cavity; 11. Inner pipe; 12. Rotating shaft. DETAILED DESCRIPTION

[0021] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below with reference to specific illustrations.

[0022] In the following embodiments, those skilled in the art will understand that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as those generally understood by those skilled in the art to which this application belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have meanings consistent with those in the context of the prior art, and will not be interpreted in an idealized or overly formal sense unless defined as herein.

[0023] See also Figure 1 、 Figure 2A preferred embodiment of a combined aeration structure of a membrane bioreactor. In this embodiment, the combined aeration structure of the membrane bioreactor includes two sets of aeration pipe systems arranged at different heights on the surface of the bottom 7 of the membrane bioreactor. The two sets of aeration pipe systems are arranged on planes at different heights of the bottom of the membrane bioreactor to form a three-dimensional aeration network to ensure the uniformity and efficiency of the aeration effect.

[0024] The paving plane of the first aeration pipe system is located above the paving plane of the second aeration pipe system. The first aeration pipe system is composed of a plurality of first aeration pipes 3. These first aeration pipes 3 are arranged in parallel and spaced apart, and the two ends are kept parallel. The structural style of the first aeration pipe 3 is as follows: Figure 2 As shown, it includes an inner tube 11 and an outer tube 9. In different embodiments, the outer diameter of the inner tube 11 can be 2 / 3 to 3 / 5 of the inner diameter of the outer tube 9. Those skilled in the art can choose according to actual needs; in this embodiment, the outer diameter of the inner tube 11 is 3 / 5 of the inner diameter of the outer tube 9.

[0025] The entire inner tube 11 is a solid tube, used to support and secure the outer tube 9. Structural support is achieved by providing external closed surfaces at both ends of the inner tube 11 and the outer tube 9 and / or by placing radial supports at intervals along the length of the first aeration tube 3 in the annular area between the inner tube 11 and the outer tube 9 (corresponding to the spatial location of the air supply lumen 10). The inner tube 11 is mounted on a motor-driven shaft 12 to enable the entire first aeration tube 3 to rotate, thereby generating dynamic airflow disturbances during the aeration process.

[0026] The inner tube 11 and outer tube 9 of the first aeration tube 3 are concentrically arranged, and the inner tube 11 on one end face of the first aeration tube 3 is a closed end face structure. At the same time, an open interface structure is provided on the air supply tube cavity 10 on this side end face, through which the first aeration main pipe 1 can be connected to the aeration control device; the tube end face at the other end of the first aeration tube 3 is entirely closed, and is assembled as a whole with the aforementioned rotating shaft 12 at the position of the center hole of the inner tube 11 corresponding to the tube end face. The rotating shaft 12 is externally connected to a drive motor to drive the inner tube 11 and the outer tube 9 of the first aeration tube 3 to rotate synchronously, thereby realizing the function of rotary aeration.

[0027] The outer tube 9 of the first aeration tube 3 serves as an aeration tube, and aeration holes 8 are evenly opened on its surface for releasing the airflow provided by the aeration control device in the form of bubbles. Combined with the overall rotation of the first aeration tube 3, dynamic airflow disturbance can be generated during the aeration process, thereby improving the aeration efficiency.

[0028] The first aeration tube 3 is formed with a base 4 at the bottom of both sides of the tube body. The base 4 is fixed at the bottom, the top surface is an arc surface, and supporting rollers are formed at the top of the arc. The base 4 is arranged at intervals in the length direction of the first aeration tube 3. While supporting the first aeration tube 3, the rollers on its surface assist in driving the first aeration tube 3 to rotate. However, no aeration holes 8 are provided on the supporting part of the base 4 corresponding to the first aeration tube 3.

[0029] The second aeration pipe system is similar to the first aeration pipe system. The second aeration pipe system consists of a plurality of second aeration pipes 5. The second aeration pipes 5 are straight pipe structures, and the cross-sectional structure of the second aeration pipe 5 is similar to that of the first aeration pipe 3, which is a concentric sleeve structure of an outer pipe inside an inner pipe. The second aeration pipe 2 is similar in style to the first aeration pipe 1 and is connected to the aeration control device in the same connection style.

[0030] The only difference between the cross-sectional dimensions of the second aeration tube 5 and the first aeration tube 3 is that the cross-sectional dimension of the first aeration tube 3 is proportionally reduced to that of the second aeration tube 5 , with the reduction ratio being 0.6 to 0.8. The second aeration tube 5 has a larger aeration volume and a wider coverage area due to its larger cross-sectional dimension.

[0031] In addition, the bottom ends of the single second aeration tube 5 are also provided with bases at both ends to serve as supporting structures for the second aeration tube 5. However, unlike the first aeration tube 3, the bases of the second aeration tube 5 are designed to be height-adjustable so that they can be adjusted according to different aeration requirements, aeration pressure, and changes in the water level in the reactor, thereby ensuring optimal aeration effect.

[0032] In this embodiment, the corresponding aeration control device is an external structure, and the aeration volume can be adjusted as needed. In other embodiments, the corresponding aeration control device can be built into the aeration pipe system to achieve a more compact design. At the same time, the shape and distribution of the aeration holes 8 can also be redesigned according to the requirements of aeration efficiency and bubble size to ensure the optimal aeration effect under the corresponding operating conditions. For example, in an embodiment with better aeration effect, the aeration holes 8 are distributed in a staggered arrangement, so that the aeration holes on the first aeration pipe 3 and the aeration holes on the second aeration pipe 5 do not completely overlap in the horizontal direction, further enhancing the airflow disturbance effect.

[0033] In order to improve the aeration efficiency and aeration effect of the second aeration pipe system and the first aeration pipe system during the aeration process, it is necessary to further define the positional layout of the second aeration pipe system and the first aeration pipe system. Specifically, the spacing between the setting plane of the first aeration pipe 3 and the setting plane of the second aeration pipe 5 is 1 / 2 to 2 / 3 of the diameter of the outer tube of the second aeration pipe 5, and the spacing between the adjacent first aeration pipe 3 and the second aeration pipe 5 on the orthographic projection plane is 3 to 10 times the diameter of the outer tube of the second aeration pipe 5. This spacing and structural position design can ensure that the two groups of aeration pipe systems complement each other during aeration, forming a more uniform and efficient aeration network, which not only ensures mutual influence and cooperation between the aeration pipes, but also avoids mutual interference and repeated aeration, thereby optimizing the aeration effect and further improving the uniformity and stability of the aeration effect.

[0034] In addition, considering that in some embodiments the paving plane of the first aeration pipe system and the paving plane of the second aeration pipe system partially overlap, in the actual assembly operation of this embodiment, a bent pipe section is further provided at the connection section between the first aeration pipe 3 and the first aeration main pipe 1 to assist in assembly.

[0035] In this embodiment, the combined structure of the first aeration pipe system and the second aeration pipe system has several different usage modes:

[0036] 1) When the first aeration pipe system is used alone, the first aeration pipe 3 can provide precise aeration control when a smaller aeration volume or more precise regulation is required;

[0037] 2) When the second aeration pipe system is used alone, the second aeration pipe 5 can play a better role when a higher aeration volume or a wider coverage area is required;

[0038] 3) When the first aeration tube system and the second aeration tube system are used in combination: on the one hand, the aeration volume can be greatly increased; on the other hand, the first aeration tube 3 and the second aeration tube 5 are aerated simultaneously during the rotation process, which can form a staggered three-dimensional airflow disturbance, thereby enhancing the aeration effect and achieving a more uniform and efficient aeration process.

[0039] In usage mode (3), this combination not only optimizes aeration efficiency but also makes the membrane bioreactor's aeration operation more flexible and controllable. To achieve these functional effects and further optimize the aeration system's performance, the diameter of the aeration holes 8 in the first aeration tube 3 is smaller than that of the aeration holes 8 in the second aeration tube 5. This allows the first aeration tube 3 to form finer bubbles when providing a smaller aeration volume, increasing the contact area between the bubbles and the sewage and thus enhancing the aeration effect.

[0040] In addition, the technical solution of this embodiment also has the technical advantages of anti-blocking and sewage discharge, specifically:

[0041] As for the anti-clogging effect, in the technical solution of this embodiment, during the rotary aeration process of the first aeration tube 3 and the second aeration tube 5, if the sludge and suspended particles in the membrane bioreactor enter the air supply tube cavity 10 of the corresponding aeration tube, they will rotate with the inner tube 11 thereof, so that the sludge and suspended particles entering the air supply tube cavity 10 will be discharged from the corresponding aeration tube due to the centrifugal force generated during the rotation of the corresponding first aeration tube 3 / second aeration tube 5; in addition, the sludge and suspended particles originally entering the air supply tube cavity 10 will not easily be deposited and solidified and adhered to in the air supply tube cavity 10 due to the rotation of the first aeration tube 3 / second aeration tube 5.

[0042] As for the sewage discharge effect based on usage mode three), in this usage mode, the second aeration tube 5 will produce large-sized bubbles at the aeration holes 8 on the surface, and the first aeration tube 3 will produce small-sized bubbles at the aeration holes 8 on the surface. If the sewage contains a high level of dirt and has a high viscosity, the corresponding small-sized bubbles will adhere to and be retained on the large-sized bubbles, thereby forming a unique mixed bubble effect. This mixed bubble effect not only improves the contact efficiency between bubbles and pollutants in the sewage, but also drives small-sized bubbles through the rise of large-sized bubbles, increasing the residence time of bubbles in the water. In addition, because small-sized bubbles have a larger specific surface area, they can more effectively adsorb tiny particles and soluble pollutants in the sewage, and the buoyancy of the mixed bubbles lifts them out of the water to form foam scum, which can be scraped out of the system by a scraper. Therefore, this unique mixed bubble effect not only improves the aeration efficiency, but also enhances the removal effect of pollutants, thereby achieving more efficient sewage treatment.

[0043] In another embodiment, the staggered distribution of aeration holes (i.e., the aeration holes 8 on the first aeration tube 3 and the aeration holes 8 on the second aeration tube 5 do not completely overlap in the horizontal direction) further enhances the uniformity and three-dimensionality of aeration, avoiding dead corners and blind spots during the aeration process.

[0044] In another embodiment, in order to further improve the aeration pressure and aeration efficiency of the aeration holes 8 and reduce aeration energy consumption, the corresponding aeration holes 8 on the first aeration tube 3 and the second aeration tube 5 can be replaced by traditional round holes with oblong holes or wavy holes arranged along the length direction of the aeration tube; while improving the aeration efficiency, the aeration airflow is made softer and more uniform, which is beneficial to reduce the impact and damage to the membrane fibers; it can also increase the difficulty of sludge and suspended particulate matter entering the aeration holes 8 and reduce the cleaning frequency.

[0045] In another embodiment, in order to further optimize the aforementioned sewage discharge effect, the corresponding first aeration pipe 3 may be further improved:

[0046] That is, while maintaining the same size and shape of the inner tube 11 in the first aeration tube 3, a plurality of arc-shaped protrusions 13 are formed on the outer tube surface of the outer tube 9. The number of these arc-shaped protrusions 13 is 3 to 5, and they are arranged in a spiral line in the length direction of the outer tube 9. The arc-shaped protrusions 13 are connected to the air supply tube cavity 10 on the inner side, and the corresponding aeration holes 8 are formed on the arc top surfaces of the corresponding arc-shaped protrusions 13.

[0047] Under these technical conditions, during the aeration process of the first aeration tube 3, due to the presence of the spiral arc-shaped protrusions 13 on the outer tube 9, during the rotational aeration process of the first aeration tube 3, these protrusions 13 can guide the aeration airflow to flow along the spiral line direction, thereby forming a spiral airflow on the surface of the first aeration tube 3. The spiral airflow not only increases the contact area and contact momentum between the airflow and the pollutants in the sewage, but also can effectively stir and disperse the sludge and suspended particles in the sewage, further improving the aeration efficiency. In addition, the design of this spiral arc-shaped protrusion 13 can also reduce the deposition of sludge and suspended particles in the air supply tube cavity 10, because they are more easily discharged continuously with the flow of air under the guidance of the spiral line, further improving the anti-blocking performance of the system.

[0048] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that these embodiments are intended only to illustrate the present invention and are not intended to limit the scope of protection of the present invention. Furthermore, it should be understood that after reading the technical content of the present invention, those skilled in the art may make various changes, modifications, and / or variations to the present invention, all of which equivalent forms fall within the scope of protection defined by the appended claims.

Claims

1. A combined aeration structure of a membrane bioreactor, characterized in that: comprising a plurality of first aeration tubes and a plurality of second aeration tubes; The first aeration pipe and the second aeration pipe are laid parallel and spaced apart on the bottom surface of the membrane bioreactor container, and the first aeration pipe and the second aeration pipe are laid on planes at different heights; The first aeration pipe and the second aeration pipe each include an inner pipe and an outer pipe arranged concentrically. The inner pipe is a solid pipe and is mounted on a rotating shaft structure driven by a motor. The outer pipe is an aeration pipe with aeration holes evenly distributed on its surface. Different aeration main pipes are connected between the inner and outer pipes of the first aeration pipe and the second aeration pipe, and are connected to an aeration control device through the aeration main pipe for air supply.

2. The combined aeration structure of the membrane bioreactor according to claim 1, characterized in that: The first aeration tube has 3 to 5 arc-shaped protrusions formed on the tube surface of the outer tube. The arc-shaped protrusions are arranged in a spiral line in the length direction of the outer tube. The arc-shaped protrusions are connected to the air supply tube cavity on the inside, and the aeration holes are formed on the arc top surfaces corresponding to the arc-shaped protrusions.

3. The combined aeration structure of the membrane bioreactor according to claim 1, characterized in that: The paving plane of the first aeration pipe is located above the paving plane of the second aeration pipe; the cross-sectional size of the first aeration pipe is proportionally reduced to the cross-sectional size of the second aeration pipe, and the reduction ratio is 0.6-0.

8.

4. The combined aeration structure of the membrane bioreactor according to claim 3, characterized in that: On the same aeration pipe, the outer diameter of the inner pipe is 2 / 3 to 3 / 5 of the inner diameter of the outer pipe.

5. The combined aeration structure of the membrane bioreactor according to claim 3, characterized in that: The diameter of the aeration holes on the first aeration tube is smaller than the diameter of the aeration holes on the second aeration tube.

6. The combined aeration structure of the membrane bioreactor according to claim 1, characterized in that: The aeration holes of the first aeration tube and the second aeration tube are arranged in a staggered manner, that is, the aeration holes on the first aeration tube and the aeration holes on the second aeration tube do not completely overlap in the horizontal direction.

7. The combined aeration structure of the membrane bioreactor according to claim 1, characterized in that: The distance between the setting plane of the first aeration tube and the setting plane of the second aeration tube is 1 / 2 to 2 / 3 of the outer tube diameter of the second aeration tube; and the distance between the adjacent first aeration tube and the second aeration tube on the orthographic projection plane is 3 to 10 times the outer tube diameter of the second aeration tube.

8. The combined aeration structure of the membrane bioreactor according to claim 1, characterized in that: The first aeration pipe and the second aeration pipe arranged in the same plane are closed at one end of the pipe body, and the other end is connected in parallel with the aeration main pipe through a multi-way.

9. The combined aeration structure of the membrane bioreactor according to claim 1, characterized in that: The aeration holes arranged on the outer tubes of the first aeration tube and the second aeration tube are oblong holes or wavy holes arranged along the length direction of the aeration tube.

10. The combined aeration structure of the membrane bioreactor according to claim 1, characterized in that: In the first aeration pipe system, a connecting section between the first aeration pipe and the first aeration main pipe is provided with a bent pipe section to assist assembly.

Images