Combined aeration structure of membrane bioreactor

Abstract

The invention 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 membrane bioreactor, combined aeration and accurate regulation and control of aeration can be performed 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 invention relates to sewage treatment equipment, in particular to a combined aeration structure of a membrane bioreactor. Background Art

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

[0003] During the operation of the membrane bioreactor, as sludge accumulates on the membrane surface, the filtration resistance increases. 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 there are often problems such as uneven aeration and a single aeration airflow path during the aeration process, 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 operation efficiency; in addition, during the aeration process, sludge is easy to enter the air pipe, and the position of the aeration pipe is relatively fixed, which is easy to cause blockage of the holes and also causes deposition and compaction at the bottom of the aeration pipe, affecting the aeration effect and ultimately affecting the overall performance of the membrane bioreactor. Summary of the invention

[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 adopting 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 of different heights;

[0008] The first aeration pipe and the second aeration pipe both include an inner pipe and an outer pipe which are arranged concentrically. The inner pipe is a solid pipe which is mounted on a rotating shaft structure driven by a motor. The outer pipe is an aeration pipe with aeration holes evenly arranged on its surface. Different aeration main pipes are connected between the inner pipe and the outer pipe 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 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 with the air supply tube cavity on the inner side, and the aeration holes are formed on the arc top surfaces corresponding to the 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 0.6-0.8;

[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 aperture of the aeration holes on the first aeration tube is smaller than the aperture 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 distributed in a staggered manner, that is, the aeration holes on the first aeration tube do not completely overlap with the aeration holes on the second aeration tube 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 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.

[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 with 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 the tubes are laid in parallel and spaced apart on planes of different heights, and are 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 realizing 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 the traditional aeration method, 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 It is a schematic diagram of the paving configuration of a preferred embodiment of the present invention.

[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. bent 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 easy to understand, the present invention is further explained below with reference to specific diagrams.

[0022] In the following embodiments, it will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as the general understanding of 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 the same meaning as the meaning in the context of the prior art, and will not be interpreted with an idealized or overly formal meaning unless defined as herein.

[0023] See also Figure 1 , Figure 2A preferred embodiment of a combined aeration structure of a membrane bioreactor is provided. In this embodiment, the combined aeration structure of the membrane bioreactor includes two groups of aeration pipe systems arranged at different heights on the surface of the bottom 7 of the membrane bioreactor. The two groups 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, which is used to support and fix the outer tube 9. The structural support effect can be achieved by setting external closed surfaces at both ends of the inner tube 11 and the outer tube 9 and / or setting radial brackets at intervals along the length direction of the first aeration tube 3 at the annular position between the inner tube 11 and the outer tube 9 (corresponding to the spatial position of the air supply tube cavity 10). The inner tube 11 is sleeved on the rotating shaft 12 structure driven by the motor to realize the overall rotation of the first aeration tube 3, thereby generating dynamic airflow disturbances during the aeration process.

[0026] The inner tube 11 and the 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 the side end face, and the first aeration main pipe 1 can be connected to the aeration control device through the open interface; the tube end face of the other end of the first aeration tube 3 is integrally closed, and is assembled as a whole with the aforementioned rotating shaft 12 at the position of the middle hole of the inner tube 11 corresponding to the tube end face, and the rotating shaft 12 is connected to the driving motor on the outside to be able 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 a supporting roller is formed at the top of the arc. The base 4 is arranged at intervals in the length direction of the first aeration tube 3, and can support the first aeration tube 3 while driving the first aeration tube 3 to rotate through the rollers on its surface; and no aeration holes 8 are set at 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 structural style 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 sleeve and an inner pipe. The second aeration pipe 2 is similar to the first aeration pipe 1 and is connected and assembled with 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 dimensions of the first aeration tube 3 are proportionally reduced by 0.6 to 0.8 of the cross-sectional dimensions of the second aeration tube 5 . The second aeration tube 5 has a larger aeration volume and a wider coverage area due to its larger cross-sectional dimensions.

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

[0032] In this embodiment, the corresponding aeration control device is an external structure, and the aeration amount 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 that the best aeration effect is achieved under the corresponding operating conditions. For example, in an embodiment with a better aeration effect, the distribution of the aeration holes 8 adopts 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 effect of airflow disturbance.

[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 limit the position arrangement 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. The design of this spacing and structural position can ensure that the two groups of aeration pipe systems complement each other during aeration to form a more uniform and efficient aeration network, which not only ensures the 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 connecting section between the first aeration pipe 3 and the first aeration main pipe 1 to assist 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 pipe system and the second aeration pipe system are used in combination: on the one hand, the aeration volume can be greatly increased, and on the other hand, the first aeration pipe 3 and the second aeration pipe 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 the use mode 3), this combination not only optimizes the aeration efficiency, but also makes the aeration operation of the membrane bioreactor more flexible and controllable. In order to cooperate with the realization of the above functional effects and further optimize the performance of the aeration system, when the aperture of the aeration hole 8 on the first aeration tube 3 is smaller than the aperture of the aeration hole 8 on the second aeration tube 5, the first aeration tube 3 can form finer bubbles when providing a smaller aeration amount, increase the contact area between the bubbles and the sewage, and thus enhance 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 scheme 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 the use mode three), in this use mode, the second aeration tube 5 will generate large-sized bubbles at the aeration hole 8 on the surface, and the first aeration tube 3 will generate small-sized bubbles at the aeration hole 8 on the surface. If the sewage contains a high content 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 can not only improve the contact efficiency between bubbles and pollutants in sewage, but also drive small-sized bubbles through the rise of large-sized bubbles, thereby increasing the residence time of bubbles in water. In addition, since small-sized bubbles have a larger specific surface area, they can more effectively absorb tiny particles and soluble pollutants in sewage, and form foam scum by the buoyancy of mixed bubbles to the water surface, 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 and avoids dead angles 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 the 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 filaments; it can also increase the difficulty of sludge and suspended particles 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 keeping the size and shape of the inner tube 11 in the first aeration tube 3 consistent, 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 with 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 this technical condition, during the aeration process of the first aeration tube 3, due to the existence of the spiral arc-shaped protrusions 13 on the outer tube 9, during the rotation 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 the airflow under the guidance of the spiral line, further improving the anti-blocking performance of the system.

[0048] The basic principle, main features and advantages of the present invention are shown and described above. It should be understood by those skilled in the art that the use of these embodiments is only used to illustrate the present invention and is not intended to limit the scope of protection of the present invention. In addition, it should also be understood that after reading the technical content of the present invention, those skilled in the art can make various changes, modifications and / or variations to the present invention, and all of these equivalent forms also fall within the scope of protection defined by the claims attached to this application.

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 of different heights; The first aeration pipe and the second aeration pipe both include an inner pipe and an outer pipe which are arranged concentrically. The inner pipe is a solid pipe which is mounted on a rotating shaft structure driven by a motor. The outer pipe is an aeration pipe with aeration holes evenly arranged on its surface. Different aeration main pipes are connected between the inner pipe and the outer pipe 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 pipe cross-sectional size of the first aeration pipe is proportionally reduced to the pipe 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 aperture of the aeration holes on the first aeration tube is smaller than the aperture 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: The connecting section between the first aeration pipe and the first aeration main pipe in the first aeration pipe system is provided with a bent pipe section to assist assembly.

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