CN110862149A

CN110862149A - Enhanced separation columnar integral membrane bioreactor based on gravity action

Info

Publication number: CN110862149A
Application number: CN201911043390.XA
Authority: CN
Inventors: 朱文芳; 王小华
Original assignee: Zhejiang University of Science and Technology ZUST
Current assignee: Zhejiang Lover Health Science and Technology Development Co Ltd; Zhejiang University of Science and Technology ZUST
Priority date: 2019-10-30
Filing date: 2019-10-30
Publication date: 2020-03-06
Anticipated expiration: 2039-10-30
Also published as: CN110862149B

Abstract

The invention relates to a membrane bioreactor, and discloses a reinforced separation columnar integral membrane bioreactor based on the action of gravity, which comprises a reactor shell (1) and an adjustable aeration device (2), wherein the adjustable aeration device (2) comprises aeration pipes (21) and a gas transmission main pipe (22), the aeration pipes (21) are sequentially inserted into the reactor shell (1) along the vertical direction and aerate different horizontal heights in the reactor shell (1), and each aeration pipe (21) is provided with an adjusting valve (210). The invention fully degrades the corresponding components through the biodegradation section by performing adaptive control of an A/O section, a sludge backflow section and a strong shearing cross flow section on water quality; sludge and other components are separated based on gravity separation and mechanical separation (biofilm formation), and a good membrane section environment is created; membrane component interception and separation based on strong shearing and cross flow; all modules in the reactor can be detached and maintained.

Description

Enhanced separation columnar integral membrane bioreactor based on gravity action

Technical Field

The invention relates to a membrane bioreactor, in particular to a reinforced separation columnar integral membrane type bioreactor based on the gravity action.

Background

The integrated membrane bioreactor not only saves the construction of a secondary sedimentation tank and greatly improves the efficiency of solid-liquid separation by integrating the membrane separation technology and the biodegradation technology, but also improves the degradation speed of biochemical reaction based on the increase of the concentration of activated sludge in the reactor and the appearance of special-effect strains (especially advantageous flora) based on the membrane separation effect.

According to the analysis of the technical principle, in the membrane bioreactor, due to the separation effect of the membrane, the soluble macromolecular compounds with long degradation time are inevitably intercepted and returned to the bioreactor for further degradation, namely the corresponding hydraulic retention time is inevitably prolonged correspondingly, and the full degradation can be obtained. Correspondingly, the nitrifying bacteria with longer generation can be accumulated in the bioreactor, and the nitrifying effect is inevitably improved. The result of this benign cycle system is a significant reduction in effluent organic content, sludge production, total nitrogen and total phosphorus content, as compared to conventional activated sludge processes. In addition, the interception of the membrane component in the membrane bioreactor can also play a role in removing bacteria. Of course, the interception function of the membrane bioreactor can also eliminate the sludge bulking phenomenon to a certain extent. The great improvement of the microorganism concentration in the membrane bioreactor can correspondingly increase the volume treatment load of the bioreactor inevitably, and the impact load resistance capacity of the whole membrane bioreactor is increased to a great extent. These significant points are the fundamental reason for the development of integrated membrane bioreactors and the key point for their development as an important process for water treatment technology.

However, just because the integrated membrane module has a trapping effect, the membrane module is in direct contact with various complex components under the complex water quality environment condition, so that the membrane bioreactor has the problem of operation pollution. The membrane module needs to be washed and replaced regularly, so that the operating energy consumption and the operating cost of the membrane bioreactor have certain limitations.

In the integrated membrane bioreactor, the columnar reactor has the characteristics of compact structure and small occupied area. However, due to this feature, several problems are caused: 1) the columnar reactor is an integer, and the stirring effect in the aeration process can cause the deterioration of the water quality environment of the membrane component in the integrated membrane bioreactor, which is the root cause of membrane component pollution; 2) the traditional columnar reactor is aerated and pushed from the bottom, and the conditions formed by anaerobic nitrification can be destroyed under the action of pneumatic induction and stirring, so that the nitrification process is not facilitated. How to overcome the two problems is the difficult point that the cylindrical integrated membrane bioreactor must solve.

At present, the invention patent with the patent number of 201580070647.4, named as membrane aeration membrane bioreactor, has the defects that membrane components are easy to be polluted and the anaerobic nitrification forming condition is easy to be damaged.

Disclosure of Invention

Aiming at the defects that membrane components are easy to pollute and easily destroy anaerobic nitrification forming conditions in the prior art, the invention provides a reinforced separation columnar integrated membrane bioreactor based on the action of gravity.

In order to solve the technical problem, the invention is solved by the following technical scheme:

reinforce integrative diaphragm type bioreactor of separation column based on action of gravity, including the reactor casing, the lower extreme of reactor casing is equipped with the water inlet, the upper end of reactor casing is equipped with the delivery port, the reactor casing is hollow columnar body, still including can regulate and control aeration equipment, can regulate and control aeration equipment and include aeration pipe and gas transmission house steward, gas transmission house steward is connected with the aeration pipe and to the aeration pipe air feed, the aeration pipe has many, the aeration pipe inserts in the reactor casing in proper order along vertical direction and aerates to different level in the reactor casing, all install the governing valve on every aeration pipe.

Preferably, the aeration pipe comprises an upper aeration pipe and a lower aeration pipe, the lower aeration pipe is provided with a plurality of aeration pipes which are uniformly arranged in the reactor shell, the upper aeration pipe performs oxygen-consuming aeration in the reactor shell, and the lower aeration pipe performs sludge pneumatic stirring in the reactor shell under the condition of not damaging anoxic environment. Through the control of the air flow, the sludge is stirred on the premise of not damaging the anoxic environment, so that the sludge is in a creeping state, the caking is avoided, and the continuous and uniform backflow of the sludge is facilitated.

Preferably, a concentric ring-shaped separation device is further installed in the reactor shell and comprises a plurality of separation rings which are sleeved with each other, the diameters of the ring surfaces of the separation rings are gradually reduced from top to bottom, the included angle between the ring surface of the separation ring and the horizontal plane is α, the included angle can be adjusted adaptively according to the actual water quality condition, α has the function of forming the effect of inclined plate sedimentation, specific values can be adjusted according to the water quality condition, the separation rings in the same group of concentric ring-shaped separation devices are arranged in parallel, and the distances between the separation rings in the same group of concentric ring-shaped separation devices are the same.

Preferably, the material of the separation ring is a material which is easy to hang a biological membrane, and the biological membrane is hung on the separation ring. Achieve the aim of further realizing water treatment by utilizing the biological membrane

Preferably, the sewage treatment device further comprises a baffle ring arranged on the separation ring, the lower ring surface of the baffle ring is fixedly connected with the upper ring surface of the separation ring, the diameter of the ring surface of the baffle ring is gradually increased from bottom to top, the included angle between the ring surface of the baffle ring and the horizontal plane is β, impurities are separated by using the inertia effect, and the angle is adaptively adjusted according to the water quality characteristics and the sludge backflow requirement.

Preferably, the device further comprises two groups of concentric annular separating devices, the two groups of concentric annular separating devices are arranged up and down and are positioned between the upper aerator pipe and the lower aerator pipe, each group of concentric annular separating devices comprises a plurality of separating rings which are mutually sleeved, and the diameters of the ring surfaces of the separating rings are gradually reduced from top to bottom.

Preferably, the reactor also comprises a sludge backflow device, the sludge backflow device comprises an inlet pipe and an outlet pipe, the outer end of the inlet pipe and the outer end of the outlet pipe are communicated with each other, the inner end of the inlet pipe and the inner end of the outlet pipe are communicated with the inside of the reactor shell, and backflow regulating valves are arranged on the inlet pipe and the outlet pipe.

Preferably, the inlet pipe is provided with a plurality of inlets communicated with the interior of the reactor shell, and the inlets are circumferentially distributed on the reactor shell and are used for conveying the sludge inwards. The system ensures the continuity of sludge backflow, and meanwhile, the sludge inlet at the upper part can be arranged in multiple directions or in an annular shape, so that the uniform distribution of the sludge backflow is ensured, and the treatment efficiency of the reactor is improved.

Preferably, the reactor also comprises a sludge stirring pneumatic device, wherein the sludge stirring pneumatic device is positioned at the bottom of the reactor shell and is of a hollow structure, the sludge stirring pneumatic device is provided with aeration holes, and the aeration pipe is communicated with the inner cavity of the sludge stirring pneumatic device and aerates through the aeration holes.

Preferably, the bottom of the reactor shell is an inverted conical cylinder, the water inlet is positioned at the lower end of the reactor shell, the sludge stirring pneumatic device is positioned in the conical cylinder above the water inlet and comprises a supporting rod and a stirring rod which are both of a hollow structure, the supporting rod is connected with the aeration pipe, the stirring rods are obliquely arranged and are close to the inner wall of the conical cylinder at the bottom of the reactor shell, and the aeration holes are positioned on the stirring rod or the supporting rod and the stirring rod.

Due to the adoption of the technical scheme, the invention has the remarkable technical effects that: the adaptive control of an A/O section, a sludge backflow section and a strong shearing cross flow section is carried out on water quality, and corresponding components are fully degraded through a biodegradation section; sludge and other components are separated based on gravity separation and mechanical separation (biofilm formation), and a good membrane section environment is created; membrane component interception and separation based on strong shearing and cross flow; all modules in the reactor can be detached and maintained.

Drawings

Fig. 1 is a schematic structural view of the present invention.

Fig. 2 is a top view of the concentric annular separation device of fig. 1.

Fig. 3 is a cross-sectional view of the concentric annular separation device of fig. 1.

The names of the parts indicated by the numerical references in the drawings are as follows: 1-reactor shell, 2-adjustable aeration device, 3-concentric annular separation device, 4-sludge reflux device, 5-sludge stirring pneumatic device, 11-water inlet, 12-water outlet, 21-aeration pipe, 22-gas transmission main pipe, 210-regulating valve, 211-upper aeration pipe, 212-lower aeration pipe, 31-separation ring, 32-baffle ring, 41-inlet pipe, 42-outlet pipe, 43-reflux regulating valve, 411-inlet, 51-support rod, 52-stirring rod.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

Example 1

Enhanced separation column-shaped integral membrane bioreactor based on gravity action, as shown in the figure, including reactor shell 1, reactor shell 1's lower extreme is equipped with water inlet 11, reactor shell 1's upper end is equipped with delivery port 12, reactor shell 1 is hollow columnar body, still including adjustable aeration equipment 2, adjustable aeration equipment 2 includes aeration pipe 21 and gas transmission main 22, gas transmission main 22 is connected with aeration pipe 21 and supplies air to aeration pipe 21, aeration pipe 21 has many, aeration pipe 21 inserts reactor shell 1 in proper order along vertical direction and aerates to reactor shell 1 interior different level, all install governing valve 210 on every aeration pipe 21.

The aeration pipe 21 includes an upper aeration pipe 211 and a lower aeration pipe 212, the lower aeration pipe 212 is provided with a plurality of pipes and is uniformly arranged in the reactor shell 1, the upper aeration pipe 211 conducts oxygen-consuming aeration in the reactor shell 1, and the lower aeration pipe 212 conducts sludge pneumatic stirring in the reactor shell 1 under the condition of not destroying an oxygen-deficient environment.

For the columnar bioreactor, aeration is carried out from the bottom by a conventional aeration mode, and the stirring effect brought by the aeration process is utilized, so that on one hand, the efficiency of dissolved oxygen is improved, and on the other hand, sludge is fully contacted with the component to be degraded. The air in the sewage flows from bottom to top, which can destroy the water quality environment condition required by nitrification. This is another problem to be solved in the column reactor, which can further improve the treatment efficiency of the column reactor based on the full utilization of the advantageous features of the column reactor. Aiming at the problem, the invention adopts a mode of a plurality of layers of adjustable aeration devices 2 to achieve the integral optimization organization of aeration, and based on the direction of sewage treatment, the aeration process in the whole reactor can be graded while the anaerobic environment is created at the bottom of the columnar reactor, and the aeration intensity is adjusted and controlled by adjusting the corresponding valve opening. That is, by arranging the aeration pipes in multiple layers along the elevation, the aeration intensity of each path can be controlled by the control valve 210. Therefore, the anaerobic environment is built at the bottom by fully utilizing the sludge concentration at the bottom and the flowing organization mode of sewage entering from the bottom, and the aerobic effect at the upper part is realized by multi-level aeration. The aeration intensity of each layer is integrally controlled to adjust and optimize the pneumatic stirring effect brought by the aeration process, an A/O adjustable degradation mode is constructed in the columnar reactor, and the treatment capacity of the biodegradation section of the columnar integral membrane bioreactor is improved.

Example 2

The reactor is similar to that of embodiment 1, except that a concentric annular separation device 3 is further installed in the reactor shell 1, the concentric annular separation device 3 comprises a plurality of separation rings 31 which are sleeved with each other, the diameters of the ring surfaces of the separation rings 31 are gradually reduced from top to bottom, the smaller included angle between the ring surface of the separation ring 31 and the horizontal plane is α, the separation rings 31 in the same group of concentric annular separation devices 3 are arranged in parallel, and the distances between the separation rings 31 in the same group of concentric annular separation devices 3 are the same.

The separating ring 31 is hung with a biological membrane.

The device also comprises a baffle ring 32 arranged on the separation ring 31, wherein the lower ring surface of the baffle ring 32 is fixedly connected with the upper ring surface of the separation ring 31, the diameter of the ring surface of the baffle ring 32 is gradually increased from bottom to top, the included angle between the ring surface of the baffle ring 32 and the horizontal plane is β, impurities are separated by utilizing the inertia effect, and the angle is adaptively adjusted according to the water quality characteristics and the sludge backflow requirement.

Still include two sets of concentric annular separation device 3, two sets of concentric annular separation device 3 set up from top to bottom and lie in between aeration pipe 211 and the lower aeration pipe 212, and every concentric annular separation device 3 of group all includes a plurality of separating ring 31 of establishing each other cover, and the anchor ring diameter of separating ring 31 reduces from top to bottom gradually.

The traditional integrated membrane bioreactor has the main problem that the membrane component and the bioreactor are different integral components, so that the pneumatic stirring of the bioreactor causes the deterioration of the water quality environment where the membrane component is located during aeration. As mentioned previously, membrane module rejection is the separation of complex components, which is the root cause of membrane fouling. For the tank-shaped bioreactor, the gravity separation function can be achieved to a certain degree by controlling the aeration intensity at different stages. However, due to the quasi-two-dimensional characteristics (the height direction is generally far larger than the size of the radius of the section), the aeration is usually pushed from the bottom, and the aeration has a strong induced stirring effect in a limited space, and considering that the following performance of the sludge is strong, the stirring inevitably causes the deterioration of the environment where the membrane module is located in a relatively upper space. If this is avoided simply by reducing the aeration intensity, it will cause the problem of insufficient aeration (the aerobic section is destroyed). Aiming at the phenomenon, the process that the flow of the columnar bioreactor is generally from the lower part of water inlet and the upper part of water outlet is considered, the gravity direction is opposite to the water flow direction, the total use based on gravity separation can be considered, the sludge basic separation can be realized by matching with the corresponding mechanical separation effect, and the water quality environment where the membrane module is positioned is optimized. The separation process takes full account of the combined effects of gravity separation and mechanical separation. The mechanical separation is achieved in the form of a two-stage concentric annular separation device 3 as shown (the second stage can also be a conventional cylindrical separation device). The cross section of the two-section concentric annular separation device 3 is shown in the figure, three boiling state fluids of gas, liquid and solid flow into the first section concentric annular separator along a set gradient after overflowing to the inlet of the first section concentric annular separator, the gradient of the concentric annular separator is equivalent to that a group of inclined plate sedimentation units are arranged in each local section, and the reverse hook arranged at the top of the annular separator is used for changing the flow direction so as to ensure that the separation is more sufficient. The second stage concentric annular separation device 3 is in the same structural form as the first stage concentric annular separation device 3. The size, spacing and slope of the two end concentric annular separators can be adjusted within suitable ranges. Meanwhile, the material can be selected from the materials which are easy to hang the biological membrane, so that a certain degradation effect can be achieved, and the separation is matched. A section of traditional cylindrical separator (the material of the membrane can be selected easily, and the aperture and the number of cylinders can be adjusted) is arranged on the two groups of concentric annular separators. The resistance characteristic of the separation structure can limit the action of pneumatic stirring to be basically below the concentric annular separation device 3 (gravity separation and mechanical separation are matched), and the local water quality environment of the membrane separation section can be improved to a considerable extent. The concentric ring-shaped separation device 3 is different in that a baffle ring 32 with an inclined outlet at different angles is designed, further inertial separation of sludge is achieved by utilizing the change of water flow direction, and a foundation is further laid for water quality optimization of a membrane separation section.

Example 3

The reactor is the same as the embodiment 1, but different from the embodiment 1, the reactor further comprises a sludge backflow device 4, the sludge backflow device 4 comprises an inlet pipe 41 and an outlet pipe 42, the outer end of the inlet pipe 41 is communicated with the outer end of the outlet pipe 42, the inner end of the inlet pipe 41 and the inner end of the outlet pipe 42 are both communicated with the inside of the reactor shell 1, the inner end of the inlet pipe 41 is positioned on the upper side of the lower aeration pipe 212, the inner end of the outlet pipe 42 is positioned on the horizontal plane where the second lower aeration pipe 212 counted from bottom to top is positioned, and backflow regulating valves 43 are arranged on the inlet pipe 41 and the outlet pipe 42.

The inlet pipe 412 is provided with a plurality of inlets 411 communicated with the interior of the reactor shell 1, and the inlets 411 are circumferentially distributed on the reactor shell 1 and convey sludge back inwards.

For the columnar reactor, the quasi-two-dimensional characteristic of the columnar reactor can be fully utilized, namely the basic topological structure characteristic that the height direction dimension is much larger than the radial dimension is utilized, and the reactor wall is directly utilized to construct an aeration mechanism for strengthening shearing. On the upper part of the reactor shell 1, on the two concentric annular separating devices 3 and a section of cylindrical separating section, a special aeration pipeline for strengthening shearing cross flow is arranged, the wall surface of the reactor shell 1 and a valve are matched, the cross flow shearing strength of the surface of the membrane component is controlled, the boundary layer condition corresponding to membrane pollution is damaged, and the optimized operation target of greatly improving the membrane pollution condition is achieved. In addition, by utilizing the sludge backflow organization optimization technology, the sludge backflow adopts a sludge backflow device 4 as shown in the figure, thereby ensuring that the sludge backflow is fully adjustable. The sludge reflux device 4 also has the functions of a membrane adsorption section, shear cross flow strengthening control, such as optimization control of an upper airflow organization system in the figure and optimization of bottom sludge reflux peristaltic pneumatic stirring, and ensures the efficiency of sludge reflux.

In order to ensure the effect of sludge backflow, as shown in the figure, under the action of the sludge backflow peristaltic pneumatic sludge stirring pneumatic device 5 of the reactor shell 1 and under the condition of ensuring that sludge is not hardened and not deposited, a multidirectional backflow method is adopted for sludge backflow, the inlet pipe 41 is divided into different directions to flow back into the reactor shell 1, the number of the inlets 411 can be adjusted as required, and the inlet pipe 41 can also be designed in a layered mode (the number of layers is determined according to requirements). The intensity of the sludge reflux can be adjusted by the corresponding reflux adjusting valve 43. Different water qualities can also correspondingly adjust the intensity proportion of the sludge backflow. The prerequisite for smooth sludge return is proper fluidity of the bottom sludge, so as to ensure uniform sludge flow during the return process.

Example 4

The reactor is the same as the embodiment 1, but different from the embodiment in that the reactor further comprises a sludge stirring pneumatic device 5, the sludge stirring pneumatic device 5 is positioned at the bottom of the reactor shell 1, the sludge stirring pneumatic device 5 is of a hollow structure, aeration holes are formed in the sludge stirring pneumatic device 5, and an aeration pipe 21 is communicated with the inner cavity of the sludge stirring pneumatic device 5 and performs aeration through the aeration holes.

The bottom of reactor casing 1 is the toper barrel of inversion, water inlet 11 is located the lower extreme of reactor casing 1, mud stirring pneumatic means 5 is located the toper barrel of water inlet 11 top, mud stirring pneumatic means 5 is including bracing piece 51 and the puddler 52 that is hollow structure, bracing piece 51 is connected with aeration pipe 21, puddler 52 has many, puddler 52 slope sets up, puddler 52 is close to the toper barrel inner wall setting of reactor casing 1 bottom, the aeration hole is located on puddler 52 or on bracing piece 51 and the puddler 52.

By utilizing the sludge stirring pneumatic device 5 of the inventor, the sludge at the bottom can be always in a slow flowing state at the bottom of the reactor shell 1 through a pneumatic stirring technology as shown in the figure, so that the realization of sludge backflow control is facilitated.

On the whole, the reactor can perform adaptive control of an A/O section, a sludge backflow section and a strong shearing cross flow section according to water quality, and corresponding components are fully degraded through a biodegradation section; sludge and other components are separated based on gravity separation and mechanical separation (biofilm formation), and a good membrane section environment is created; membrane module interception separation based on strong shearing cross flow. All modules in the reactor can be detached and maintained. For the purposes of the present invention, it is generally characterized by a standardized process, which can be used as a standard unit in the overall wastewater treatment process.

In summary, the above-mentioned embodiments are only preferred embodiments of the present invention, and all equivalent changes and modifications made in the claims of the present invention should be covered by the claims of the present invention.

Claims

1. Strengthen integrative diaphragm type bioreactor of separation column based on action of gravity, including reactor casing (1), the lower extreme of reactor casing (1) is equipped with water inlet (11), and the upper end of reactor casing (1) is equipped with delivery port (12), its characterized in that: still including adjustable aeration equipment (2), adjustable aeration equipment (2) include aeration pipe (21) and gas transmission house steward (22), gas transmission house steward (22) are connected with aeration pipe (21) and to aeration pipe (21) air feed, aeration pipe (21) have many, aeration pipe (21) insert reactor casing (1) in proper order along vertical direction and to the aeration of reactor casing (1) interior different level, all install governing valve (210) on every aeration pipe (21).

2. The gravity-based enhanced separation cylindrical integrated membrane bioreactor of claim 1, wherein: the aeration pipe (21) comprises an upper aeration pipe (211) and a lower aeration pipe (212), the lower aeration pipe (212) is provided with a plurality of aeration pipes which are uniformly arranged in the reactor shell (1), the upper aeration pipe (211) carries out oxygen consumption aeration in the reactor shell (1), and the lower aeration pipe (212) carries out sludge pneumatic stirring in the reactor shell (1) under the condition of not damaging an anoxic environment.

3. The bioreactor with the reinforced separation columnar integral membrane based on the gravity action as claimed in claim 1, wherein a concentric annular separation device (3) is further installed in the reactor shell (1), the concentric annular separation device (3) comprises a plurality of separation rings (31) which are sleeved with each other, the diameter of the ring surface of each separation ring (31) is gradually reduced from top to bottom, and the included angle between the ring surface of each separation ring (31) and the horizontal plane is α.

4. The gravity-based enhanced separation cylindrical integrated membrane bioreactor of claim 3, wherein: the separating ring (31) is made of a material which is easy to hang a biological membrane.

5. The bioreactor of claim 3, further comprising a baffle ring (32) installed on the separation ring (31), wherein the lower ring surface of the baffle ring (32) is fixedly connected with the upper ring surface of the separation ring (31), the diameter of the ring surface of the baffle ring (32) is gradually increased from bottom to top, and the included angle between the ring surface of the baffle ring (32) and the horizontal plane is β and is larger than β.

6. The gravity-based enhanced separation cylindrical integrated membrane bioreactor of claim 2, wherein: still include two sets of concentric annular separation device (3), two sets of concentric annular separation device (3) set up from top to bottom and lie in and go up between aeration pipe (211) and lower aeration pipe (212), and every concentric annular separation device of group (3) all includes a plurality of separating ring (31) of establishing of overlapping each other, and the anchor ring diameter of separating ring (31) reduces from top to bottom gradually.

7. The gravity-based enhanced separation cylindrical integrated membrane bioreactor of claim 2, wherein: still include mud reflux unit (4), mud reflux unit (4) are including advancing pipe (41) and exit tube (42), advance the outer end of pipe (41) and the outer end of exit tube (42) and communicate each other, advance and all be equipped with return flow control valve (43) on pipe (41) and exit tube (42).

8. The gravity-based enhanced separation cylindrical integrated membrane bioreactor of claim 7, wherein: the inlet pipe (41) is provided with a plurality of inlets (411) communicated with the interior of the reactor shell (1), and the inlets (411) are circumferentially distributed on the reactor shell (1) and convey sludge inwards.

9. The gravity-based enhanced separation cylindrical integrated membrane bioreactor of claim 1, wherein: the reactor is characterized by further comprising a sludge stirring pneumatic device (5), wherein the sludge stirring pneumatic device (5) is located at the bottom of the reactor shell (1), the sludge stirring pneumatic device (5) is of a hollow structure, aeration holes are formed in the sludge stirring pneumatic device (5), and an aeration pipe (21) is communicated with the inner cavity of the sludge stirring pneumatic device (5) and aerates through the aeration holes.

10. The gravity-based enhanced separation cylindrical integrated membrane bioreactor of claim 9, wherein: the bottom of reactor casing (1) is the toper barrel of inversion, water inlet (11) are located the lower extreme of reactor casing (1), mud stirring pneumatic means (5) are located the toper barrel of water inlet (11) top, mud stirring pneumatic means (5) are including bracing piece (51) and puddler (52) that are hollow structure, bracing piece (51) are connected with aeration pipe (21), puddler (52) have many, puddler (52) slope sets up, puddler (52) are close to the toper barrel inner wall setting of reactor casing (1) bottom, the aeration hole is located on puddler (52) or on bracing piece (51) and puddler (52).