CN104403937B - Rotate internal circulation gas-lift type membrane bioreactor and process system thereof - Google Patents

Abstract

The invention discloses a rotating internal circulation air-lift membrane bioreactor, which comprises a reactor main body, a primary membrane separation device and a filtrate collection device; The two ends of the membrane module are detachably fixed on the two rotating frames arranged up and down, the rotating frame is fixed on the sealed bearing, and the sealed bearing is set on the guide tube; the filtrate collecting device includes a filtrate collector and a filtrate collecting pipe; Secondary membrane modules can be installed in the filtrate collector according to the process. The rotating internal circulation airlift membrane bioreactor integrates airlift reaction and membrane separation. Most of the energy required for the whole process is provided by compressed gas. The number, angle, activation or not of membrane modules, and membrane flux can all be adjusted manually. , in order to adapt to the different operations of the airlift reactor, the coupling of the two is well realized, and it has the advantages of low energy consumption, simple structure, flexible operation, and mild reaction conditions.

Description

Rotating internal circulation airlift membrane bioreactor and its process system

technical field

The invention relates to the technical field of membrane bioreactors, in particular to a rotary internal circulation airlift membrane bioreactor and a process system thereof.

Background technique

In the process of biochemical reaction, as the reaction proceeds, the fermentation product accumulates continuously, and the inhibitory effect of the product gradually becomes prominent. For example, in the production of popular chemicals such as ethanol, for general Saccharomyces cerevisiae, the concentration of ethanol at the end of single-stage tank batch fermentation reaches 18%- At 20%, the cell activity was severely inhibited and even a large number of cells died. In the process of enzymatically degrading biological polysaccharides to prepare active oligosaccharides, extracellular enzymes are often subject to both substrate induction and product inhibition. For example, in the production of carrageenan or alginate, excessive accumulation of disaccharide units obtained by enzymatic cleavage of substrates It will affect the bacteria to continue to produce enzymes.

On the other hand, product consumption also often exists. For example, during the submerged fermentation of Ganoderma lucidum polysaccharides, the fermented Ganoderma lucidum polysaccharides can be used by the fermentation cells, and the yield will be greatly reduced if the system is not removed in time.

Therefore, in order to improve the reaction yield and production intensity, it is one of the good solutions to use the characteristics of membrane bioreactor coupling reaction and separation operation to "remove while reacting" the product in the system. This type of bioreactor combines microbial fermentation and product separation, and is often used to solve problems such as fermentation product inhibition and substrate selection and supply. Through long-term continuous fermentation, it can achieve the purpose of high-density growth of microorganisms and increase the yield of fermentation products. The cell density or the yield of metabolites can usually reach ten times or even more than one hundred times that of batch fermentation. In this process, after the fermentation liquid is filtered through the membrane, the fermentation product is effectively removed from the fermenter, reducing or even eliminating the inhibition and consumption of the product, while the remaining raffinate and trapped cells continue to return to the fermenter, thereby The high cell concentration in the fermenter is maintained, and at the same time, the liquid level balance in the tank is conveniently realized. For example, using a membrane bioreactor system for continuous fermentation of Ganoderma lucidum polysaccharides, soluble Ganoderma lucidum polysaccharides can be continuously permeated through the filter membrane of the membrane bioreactor. By continuously replenishing fresh feed liquid, the sugar source is improved, the utilization of polysaccharide by mycelium is reduced, the yield of mycelium and the yield of Ganoderma lucidum polysaccharide are increased, and the growth of mycelium increases with the increase of dilution rate , the total dry weight of mycelium can be increased by more than 20% compared with batch fermentation.

However, during the operation of the membrane reactor, the feed liquid is separated on the surface of the membrane after being transported by the pump, and the pollution of the membrane is extremely serious, and the concentration of the product separated by the membrane is the same as that in the reaction tank, and the follow-up treatment is more troublesome; at the same time, Due to the use of pumps, the energy consumption of this process is high, and the violent turbulence of the fluid is easy to deteriorate the reaction conditions, which is not conducive to the growth of bacteria.

In order to overcome these problems, ZL01108189.9, ZL200520075139.9, and ZL200910026442.2 successively proposed to use compressed gas as the power of the membrane bioreactor instead of the traditional pump. However, the former connects the reactor and the membrane module through ordinary pipes, resulting in a relatively dispersed reactor structure and a long fluid circulation line, which affects the gas-liquid mass transfer effect and is difficult to meet the needs of large-scale reactions. On the basis of the former, the latter proposes an external circulation air-lift membrane reactor. In this reactor, the membrane module is well coupled with the reactor, but in this reactor, the return port is located in the enlarged section of the upper part of the reactor body. At the point where the return port is located above or below the liquid surface, the depth is very small. At the same time, there is no guide tube at the return port, and a large amount of compressed gas will escape and be discharged immediately after the cycle ends, which only plays the role of cycle power and has no effect. Be rationally utilized, resulting in energy loss. The latter proposes an outer loop airlift membrane bioreactor on the basis of the former two, which introduces membrane modules without changing the basic structure of the airlift reactor. Function of bioreactor and gas stripping. However, the existence of the air stripping unit in the reactor limits the scope of application of the reactor, that is, the volatile characteristics of the suppressed product are required. At the same time, because the membrane module of this type of reactor is located in the circulation pipe, the circulation resistance of the airlift reactor is increased, and it is easy to cause uneven distribution of cells and nutrients in the reactor. The above-mentioned inventions have solved the problem of membrane reactor reaction unit-separation unit coupling to a certain extent, but for the purpose of coupling, other complex structures have been introduced, which is not conducive to amplification, and there are low energy efficiency, narrow application range, complex structure, membrane Susceptibility to problems and defects such as contamination.

It can be seen that a new type of integrated membrane bioreactor with a wide range of applications has been developed, especially an integrated membrane bioreactor suitable for the field of fermentation, which combines the advantages of membrane separation and airlift reactors. At the same time, it has high energy utilization efficiency and has very important practical significance.

Contents of the invention

The purpose of the present invention is: in order to solve the above-mentioned problems of product inhibition and product consumption in the field of fermentation, according to the advantages of membrane separation reactors and airlift reactors and the characteristics of their mutual compensation of shortcomings, provide a kind of A rotary internal circulation airlift membrane bioreactor and its process system.

In order to solve the above technical problems, the technical solution of the present invention is: a rotary internal circulation airlift membrane bioreactor, comprising a reactor main body, a primary membrane separation device and a filtrate collection device; The kettle body and the gas distributor, the top of the kettle body is equipped with a pressure gauge and is provided with a liquid inlet, an exhaust port, and a vent port. The exhaust port is connected to the exhaust control valve, and the vent port is connected to the vent valve. The round wall is equipped with a window and a circulating liquid inlet, and the bottom of the kettle body is provided with a liquid discharge port. The inside of the kettle body is equipped with a guide tube, and the inside of the guide tube is installed with an air guide tube. The upper part of the air guide tube is connected to the vent. The lower part is connected with the gas distributor, and the gas distributor is a stepped multi-ring; the first-stage membrane separation device includes a rotating frame, a sealed bearing and a first-stage membrane module. The first-stage membrane modules are evenly distributed around the outer circular wall of the guide tube, and the two ends of the first-stage membrane module are detachably fixed on two rotating frames arranged up and down. The rotating frame is fixed on the sealed bearing, and the sealed bearing Set on the guide tube; the filtrate collection device includes a filtrate collector and a filtrate collection pipe, the filtrate collector includes a sealed bearing, an upper screw cap and a tank body, the upper screw cap is connected with the tank body, and the sealed bearing is set on the upper screw cap, The filtrate collector is installed on the bottom of the kettle through the upper screw cap and is located directly below the gas distributor. The filtrate collector is connected to the rotating frame at the lower part through the filtrate collection pipe. The bottom of the tank is provided with a filtrate port, which is connected to the vacuum The control valve is connected, and the lower part of the outer wall of the tank is provided with a circulating fluid outlet, and the circulating fluid outlet is connected with the circulation regulating valve.

Further, a secondary membrane module is installed in the filtrate collector.

Further, a viewing window is provided on the outer circular wall of the kettle body.

Further, the distance between the two rotating frames is 0.1-1 of the length of the guide tube.

Further, the aspect ratio of the main body of the reactor is 3-10.

Further, the inclination angle of the primary membrane module is 20-90 degrees.

Further, a thermometer, a pH meter, a dissolved oxygen electrode, a liquid level probe and a sampling port are installed on the side of the kettle body.

Further, the filtrate collector is connected to the lower rotating frame through 3 filtrate collecting pipes at an interval of 120 degrees.

The process system of the rotary internal circulation airlift membrane bioreactor, the ventilation valve of the rotary internal circulation airlift membrane bioreactor is connected with the gas flow meter, the steel cylinder and the compressed air machine in turn; the rotary internal circulation airlift membrane bioreactor The vacuum control valve of the rotary internal circulation airlift membrane bioreactor is connected with the filtrate collection tank and the vacuum pump in sequence; the circulation regulating valve of the rotary internal circulation airlift membrane bioreactor is connected with the circulation pump and the circulating liquid inlet of the rotary internal circulation airlift membrane bioreactor in sequence.

Further, a secondary membrane module is installed in the filtrate collector of the rotating internal circulation airlift membrane bioreactor.

Further, the gas flow meter is connected with the recoil control valve and the vacuum control valve in sequence.

Beneficial effects of the present invention:

1. The first-stage membrane separation device adopts a rotating first-stage membrane module, which uses the fluid kinetic energy in the airlift reactor to drive the first-stage membrane module to rotate without additional energy input, and at the same time increases the liquid contact area between the membrane and the reactor and improves The role of membrane permeation; at the same time, use fluid to flush the membrane surface to reduce membrane fouling; the number and installation angle of the first-stage membrane modules can be adjusted, which is suitable for different gas holdup reactions and products with different separation properties, expanding the application range of this reactor ;

2. Secondary membrane modules can be set in the filtrate collector to perform secondary membrane separation. During the secondary membrane separation process, the primary filtrate in the filtrate collector can be pumped into the kettle body for circulation through the circulation pump. The circulation pump can be used according to The production process is selected and opened, the scope of application of the reactor is expanded, and the purity of the product is improved;

3. Positive pressure operation or negative pressure suction can be selected for membrane separation. When positive pressure filtration is performed, the valve at the vent on the top of the reactor can be turned down to increase the pressure in the reactor and realize membrane separation; when the pressure in the reactor When it is normal pressure or negative pressure, turn on the vacuum pump for negative pressure operation; you can also adjust the pressure in the kettle to adjust the operation of the membrane separation device. For example, when the pressure in the kettle is normal, the membrane separation device is closed, so that it can Adjust the ventilation rate and membrane flux to change the product removal rate, so that the corresponding adjustment can be made according to the reaction rate, which can be applied to the reaction process with different oxygen demand, and the operation is more flexible;

In summary, the rotating internal circulation airlift membrane bioreactor breaks the concept of regionalization of membrane modules in traditional membrane reactors, integrates airlift reaction and membrane separation, and evenly disperses and arranges the first-stage membrane modules in the internal circulation airlift reaction The downcomer zone of the reactor realizes the effective coupling between the membrane reactor and the airlift reactor in the field of biological fermentation. Most of the energy required for the whole process is provided by compressed gas. Both can be manually adjusted to adapt to different operations of the airlift reactor, and the coupling between the two is well realized. It has the advantages of low energy consumption, simple structure, flexible operation, and mild reaction conditions. The process of sugar and other products and substrates with large molecular weight difference provides new reaction equipment and technology.

Description of drawings

Fig. 1 is a schematic structural diagram of a rotating internal circulation airlift membrane bioreactor;

Fig. 2 is a top view of a primary membrane separation device;

Fig. 3 is a schematic cross-sectional view of a first-stage membrane module;

Fig. 4 is a structural schematic diagram of a first-stage membrane module;

Fig. 5 is a schematic view of the structure of the filtrate collector;

Fig. 6 is a process system diagram of a rotating internal circulation airlift membrane bioreactor.

Among them: 1. Liquid inlet, 2. Air duct, 3. Guide cylinder, 4. Kettle body, 5. Gas distributor, 6. Liquid outlet, 7. Secondary membrane module, 8. Filtrate port, 9. Vacuum control valve, 10. Circulation regulating valve, 11. Filtrate collector, 12. Filtrate collection pipe, 13. Swivel frame, 14. Sealed bearing, 15. Primary membrane module, 16. Window, 17. Circulating fluid inlet, 18 .Exhaust port, 19. Exhaust control valve, 20. Vent valve, 21. Vent port, 22. Screw cap, 23. Circulation pump, 24. Tank body, 25. Filtrate collection tank, 26. Vacuum pump, 27. Recoil control valve, 28. Steel cylinder, 29. Compressed air machine, 30. Gas flow meter, 31. Circulating fluid outlet.

detailed description

Embodiment one

As shown in Figures 1 to 5, the rotating internal circulation airlift membrane bioreactor includes the main body of the reactor, the primary membrane separation device and the filtrate collection device; the main body of the reactor includes the air duct 2, the guide tube 3, and the reactor 4 and a gas distributor 5, a pressure gauge is installed on the top of the kettle body 4 and is provided with a liquid inlet 1, an exhaust port 18, and an air vent 21, and the exhaust port 18 is connected with the exhaust control valve 19, and the exhaust volume is adjusted Thereby regulating the pressure in the kettle body 4, the vent 21 is connected with the vent valve 20, the outer circular wall of the kettle body 4 is provided with a window 16, a circulating liquid inlet 17, and the side of the kettle body 4 is equipped with a thermometer, a pH meter, a dissolved oxygen Electrodes, liquid level probes and sampling ports are provided. The bottom of the kettle body 4 is provided with a liquid outlet 6. The inside of the kettle body 4 is equipped with a guide tube 3. The upper part of the reactor is connected to the vent 21, and the lower part is connected to the gas distributor 5. The gas distributor 5 is stepped and multi-ring, and the height-to-diameter ratio of the main body of the reactor is 3-10; the first-stage membrane separation device includes a rotating frame 13 and a sealed bearing 14 and the primary membrane assembly 15, the primary membrane assembly 15 is an elbow-type hollow structure with a horseshoe-shaped cross-section, which can reduce the overall weight, make it easier to rotate, and increase the specific surface area of the primary membrane assembly 15 in contact with the liquid. The primary membrane assembly 15 can Replace with ultrafiltration or microfiltration inorganic membranes according to production needs, which can withstand sterilization operations and intercept bacteria and unreacted polysaccharide substrates. The number of first-stage membrane modules 15 can be selected according to the production process. First-stage membrane modules 15 The inclination angle can be manually adjusted to 20-90 degrees. The first-stage membrane module 15 performs positive pressure filtration when liquid/solid separation is performed, and the transmembrane pressure difference is 0.01-1MPa, or negative pressure suction is used, and the transmembrane pressure difference is 0.01-1MPa, the four first-stage membrane modules 15 in the gas-lifting-liquid area are evenly distributed around the outer circular wall of the guide tube 3 at an axial angle of 45 degrees, and the two ends of the first-stage membrane modules 15 are detachably fixed on the upper and lower rows respectively. On the two rotating racks 13 of cloth, the distance between the two rotating racks 13 is 0.1-1 of the length of the guide tube 3, the rotating rack 13 is fixed on the sealed bearing 14, and the sealed bearing 14 is sleeved on the guide tube 3; the filtrate is collected The device includes a filtrate collector 11 and a filtrate collecting pipe 12, the filtrate collector 11 includes a sealed bearing 14, an upper screw cap 22 and a tank body 24, the upper screw cap 22 is connected with the tank body 24, and the sealed bearing 14 is set on the upper screw cap 22 , the filtrate collector 11 is installed on the bottom of the kettle body 4 through the upper screw cap 22 and is located directly below the gas distributor 5, and the filtrate collector 11 is connected to the lower rotating frame 13 through three filtrate collecting pipes 12 at an interval of 120 degrees , to generate a rotating torque, so that the rotation can be carried out smoothly, and it is also beneficial for the primary membrane module 15 to be washed away to prevent pollution. The secondary membrane module 7 can be installed in the filtrate collector 11, and can be replaced with ultrafiltration or microfiltration inorganic according to production needs. Membrane, which can withstand sterilization operations, intercept bacteria and unreacted polysaccharide substrates, the bottom of the tank body 24 is provided with a filtrate port 8, and the filtrate port 8 is connected to the vacuum control valve 9, and the lower part of the outer circular wall of the tank body 24 A circulating fluid outlet 31 is provided, and the circulating fluid outlet 31 is connected with the circulation regulating valve 10 .

As shown in Figures 1-6, the process system of the rotary internal circulation airlift membrane bioreactor, the vent valve 20 of the rotary internal circulation airlift membrane bioreactor is connected with the gas flow meter 30, the steel cylinder 28, the compressed air machine in sequence 29 connected; the vacuum control valve 9 of the rotary internal circulation airlift membrane bioreactor is connected with the filtrate collection tank 25 and the vacuum pump 26 successively; the circulation regulating valve 10 of the rotary internal circulation airlift membrane bioreactor is sequentially connected with the circulation pump 23, The circulating liquid inlet 17 of the rotary internal circulation airlift membrane bioreactor is connected; the gas flow meter 30 is connected with the recoil control valve 27 and the vacuum control valve 9 in sequence, and the first-stage membrane module 15 and the second-stage membrane module 15 can be backwashed after production is completed. Membrane module 7: applied to continuous fermentation to produce enzymes to degrade carrageenan substrate to obtain oligosaccharide components, after in-situ sterilization, feed liquid into the kettle body 4 through the liquid inlet 1, and blow into it through the vent 21 Compressed gas, the gas enters the guide tube 3 through the gas distributor 5, due to the entry of compressed gas with a certain initial velocity, there is a density difference between the gas lifting liquid area and the guide tube 3, under the action of these two , the fluid in the guide tube 3 moves upward, and the liquid in the air-lifting liquid area moves downward, and when it reaches the first-stage membrane module 15, the opening of the first-stage membrane separation device can be controlled by the vacuum control valve 9; the biomass and enzyme activity can be detected by sampling Determining the enzyme production status of the thalline by measuring, etc., when the enzyme production is stable, turn on the first-level membrane separation device for about 12 hours, and then carry out continuous fermentation operation, and the first-level membrane separation device is always open; the concentrated liquid enters the filtrate collection through the filtrate collection pipe 12 In the device 11, the hollow fiber secondary membrane module 7 in the filtrate collector 11 is used to perform secondary membrane separation, so that the product purity and concentration are improved at the same time; the primary filtrate needs to be pumped into the kettle body 4 through the filtrate circulation pipeline, and then concentrated The liquid is collected in the filtrate collection tank 25; this embodiment can also be used in the fermentation separation process of products such as agarose oligosaccharides and alginate oligosaccharides, and substrates with large molecular weight differences.

Embodiment two

As shown in Figures 1 to 5, the rotating internal circulation airlift membrane bioreactor includes the main body of the reactor, the primary membrane separation device and the filtrate collection device; the main body of the reactor includes the air duct 2, the guide tube 3, and the reactor 4 and a gas distributor 5, a pressure gauge is installed on the top of the kettle body 4 and is provided with a liquid inlet 1, an exhaust port 18, and an air vent 21, and the exhaust port 18 is connected with the exhaust control valve 19, and the exhaust volume is adjusted Thereby regulating the pressure in the kettle body 4, the vent 21 is connected with the vent valve 20, the outer circular wall of the kettle body 4 is provided with a window 16, a circulating liquid inlet 17, and the side of the kettle body 4 is equipped with a thermometer, a pH meter, a dissolved oxygen Electrodes, liquid level probes and sampling ports are provided. The bottom of the kettle body 4 is provided with a liquid outlet 6. The inside of the kettle body 4 is equipped with a guide tube 3. The upper part of the reactor is connected to the vent 21, and the lower part is connected to the gas distributor 5. The gas distributor 5 is stepped and multi-ring, and the height-to-diameter ratio of the main body of the reactor is 3-10; the first-stage membrane separation device includes a rotating frame 13 and a sealed bearing 14 and the primary membrane assembly 15, the primary membrane assembly 15 is an elbow-type hollow structure with a horseshoe-shaped cross-section, which can reduce the overall weight, make it easier to rotate, and increase the specific surface area of the primary membrane assembly 15 in contact with the liquid. The primary membrane assembly 15 can Replace with ultrafiltration or microfiltration inorganic membranes according to production needs, which can withstand sterilization operations and intercept bacteria and unreacted polysaccharide substrates. The number of first-stage membrane modules 15 can be selected according to the production process. First-stage membrane modules 15 The inclination angle can be manually adjusted to 20-90 degrees. The first-stage membrane module 15 performs positive pressure filtration when liquid/solid separation is performed, and the transmembrane pressure difference is 0.01-1MPa, or negative pressure suction is used, and the transmembrane pressure difference is 0.01-1MPa, the four first-stage membrane modules 15 in the gas-lifting-liquid area are evenly distributed around the outer circular wall of the guide tube 3 at an axial angle of 45 degrees, and the two ends of the first-stage membrane modules 15 are detachably fixed on the upper and lower rows respectively. On the two rotating racks 13 of cloth, the distance between the two rotating racks 13 is 0.1-1 of the length of the guide tube 3, the rotating rack 13 is fixed on the sealed bearing 14, and the sealed bearing 14 is sleeved on the guide tube 3; the filtrate is collected The device includes a filtrate collector 11 and a filtrate collecting pipe 12, the filtrate collector 11 includes a sealed bearing 14, an upper screw cap 22 and a tank body 24, the upper screw cap 22 is connected with the tank body 24, and the sealed bearing 14 is set on the upper screw cap 22 , the filtrate collector 11 is installed on the bottom of the kettle body 4 through the upper screw cap 22 and is located directly below the gas distributor 5, and the filtrate collector 11 is connected to the lower rotating frame 13 through three filtrate collecting pipes 12 at an interval of 120 degrees , to generate a rotating moment, so that the rotation can be carried out smoothly, and it is also beneficial to the first-stage membrane module 15 to be washed away to prevent pollution. The lower part of the wall is provided with a circulating fluid outlet 31 , and the circulating fluid outlet 31 is connected with the circulating regulating valve 10 .

As shown in Figures 1-6, the process system of the rotary internal circulation airlift membrane bioreactor, the vent valve 20 of the rotary internal circulation airlift membrane bioreactor is connected with the gas flow meter 30, the steel cylinder 28, the compressed air machine in sequence 29 connected; the vacuum control valve 9 of the rotary internal circulation airlift membrane bioreactor is connected with the filtrate collection tank 25 and the vacuum pump 26 successively; the circulation regulating valve 10 of the rotary internal circulation airlift membrane bioreactor is sequentially connected with the circulation pump 23, The circulating liquid inlet 17 of the rotary internal circulation air-lift membrane bioreactor is connected; the gas flow meter 30 is connected with the recoil control valve 27 and the vacuum control valve 9 in turn, and the primary membrane module 15 can be backwashed after the production is completed; In the process of producing Ganoderma lucidum polysaccharide by submerged fermentation method, feed liquid is added into the kettle body 4 through the liquid inlet 1, and compressed gas is blown into it through the vent 21, and the gas enters the guide tube 3 through the gas distributor 5, and the guide tube 3 The internal fluid moves upwards, and the liquid in the gas-lifting liquid area moves downwards. When it reaches the first-stage membrane module 15, the vacuum pump 26 is turned on to adjust the transmembrane pressure difference and carry out negative pressure suction to make the membrane flux consistent with the feeding rate. Keep the liquid level balance in the tank; the concentrated solution enters the filtrate collector 11 through the filtrate collection pipe 12, and then the concentrated solution is collected in the filtrate collection tank 25, because the thalline cannot pass through the microfiltration membrane, the thalline remains in the still body 4, The tank contains a higher cell concentration; this embodiment can also be used for primary membrane filtration such as lentinan, versicolor polysaccharide, and Hericium erinaceus polysaccharide.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto, and any person familiar with the technical field within the technical scope disclosed in the present invention, according to the technical solution of the present invention Any equivalent replacement or change of the inventive concepts thereof shall fall within the protection scope of the present invention.

Claims (10)

1. rotate internal circulation gas-lift type membrane bioreactor, it is characterised in that: include reactor main body, one-level film Segregation apparatus and Filtrate collection device；Reactor main body includes airway (2), guide shell (3), kettle (4) With gas distributor (5), the top of kettle (4) is provided with Pressure gauge and is provided with inlet (1), aerofluxus Mouth (18), blow vent (21), air vent (18) is connected with gas exhausting valve (19), blow vent (21) Being connected with breather valve (20), the cylindrical wall of kettle (4) is provided with form (16), circulation fluid entrance (17), The bottom of kettle (4) is provided with leakage fluid dram (6), and the internally installed of kettle (4) has guide shell (3), water conservancy diversion Cylinder the internally installed of (3) has airway (2), and the top of airway (2) is connected with blow vent (21), Bottom is connected with gas distributor (5), and gas distributor (5) is that how annular ladder is；

One-level membrane separation device includes swivel mount (13), seals bearing (14) and one-level membrane module (15), One-level membrane module (15) is the bent-tube boiler hollow structure of horseshoe shaped section, some described one-level membrane modules (15) being distributed on the cylindrical wall surrounding of guide shell (3), the two ends of one-level membrane module (15) are the most removable The formula of unloading is fixed on two swivel mounts (13) arranged up and down, and swivel mount (13) is fixed on sealing bearing (14) On, seal bearing (14) and be sleeved on guide shell (3)；

Filtrate collection device includes filtrate collection (11) and percolate collection tubes (12), filtrate collection (11) Including sealing bearing (14), upper spiral cover (22) and tank body (24), upper spiral cover (22) and tank body (24) Connecting, seal bearing (14) and be sleeved on spiral cover (22), filtrate collection (11) is by upper spiral cover (22) it is arranged on the bottom of kettle (4) and is positioned at the underface of gas distributor (5), filtrate collection (11) it is connected by percolate collection tubes (12) with the swivel mount (13) being positioned at bottom, tank body (24) Bottom is provided with filtrate port (8), and filtrate port (8) is connected with vacuum control valve (9), tank body (24) cylindrical The bottom of wall is provided with circulation fluid outlet (31), and circulation fluid outlet (31) is connected with circulating regulation valve (10).

Rotation internal circulation gas-lift type membrane bioreactor the most according to claim 1, it is characterised in that: institute In the filtrate collection (11) stated, second membrane module (7) is installed.

Rotation internal circulation gas-lift type membrane bioreactor the most according to claim 1, it is characterised in that: institute The 0.1-1 that spacing is guide shell (3) length of two swivel mounts (13) stated.

Rotation internal circulation gas-lift type membrane bioreactor the most according to claim 1, it is characterised in that: institute The ratio of height to diameter stating reactor main body is 3-10.

Rotation internal circulation gas-lift type membrane bioreactor the most according to claim 1, it is characterised in that: institute The angle of inclination stating one-level membrane module (15) is 20-90 degree.

Rotation internal circulation gas-lift type membrane bioreactor the most according to claim 1, it is characterised in that: institute The side stating kettle (4) is provided with thermometer, pH meter, dissolved oxygen electrode, liquid-level probe and is provided with sample tap.

Rotation internal circulation gas-lift type membrane bioreactor the most according to claim 1, it is characterised in that: institute The filtrate collection (11) stated and the swivel mount (13) being positioned at bottom pass through 3 percolate collection tubes (12) It is connected in 120 degree of spacing.

8. applying the system rotating internal circulation gas-lift type membrane bioreactor described in claim 1, it is special Levy and be: the breather valve (20) of described rotation internal circulation gas-lift type membrane bioreactor successively with gas flow Meter (30), steel cylinder (28), air compressor (29) are connected；Rotate internal circulation gas-lift type membrane biological reaction The vacuum control valve (9) of device is connected with filtrate collection tank (25), vacuum pump (26) successively；Follow in rotation The circulating regulation valve (10) of ring gas-lifting type membrane bioreactor circulates with in circulating pump (23), rotation successively The circulation fluid entrance (17) of gas-lifting type membrane bioreactor is connected.

System the most according to claim 8, it is characterised in that: described rotation internal circulation gas-lift type film is biological In the filtrate collection (11) of reactor, second membrane module (7) is installed.

System the most according to claim 8, it is characterised in that: described gas flowmeter (30) is successively It is connected with recoil control valve (27), vacuum control valve (9).