Hospital sewage treatment system and treatment method thereof

Abstract

The invention provides a hospital sewage treatment system and a treatment method thereof. The hospital sewage treatment system comprises a grating tank, a regulating tank, an anoxic tank, a contact oxidation tank, a secondary sedimentation tank and a disinfection tank which are sequentially connected in a sewage treatment direction, the grating pool is connected with an accident pool and is used for removing floating objects in hospital wastewater and accident wastewater; lifting pumps are mounted in the regulating tank and the accident tank; the regulating tank is used for homogenizing water quality and water quantity; a bioreactor is arranged in the anoxic tank for denitrification treatment to remove the total nitrogen index in the sewage; the contact oxidation tank is divided into a membrane filter tank and a backwashing tank, a sealing partition plate is rotationally connected between the membrane filter tank and the backwashing tank, and a plurality of parallel membrane frames are fixedly connected to the two sides of the sealing partition plate at intervals. The effluent quality of the wastewater treated by the system is high and stable, the process parameters are easy to control, ammonia nitrogen and refractory organics in water can be removed, the water body is effectively sterilized and disinfected, the operation and management are convenient, and the automation control is easy.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and in particular to a hospital sewage treatment system and a treatment method thereof. Background Art

[0002] Medical sewage is mainly discharged from the hospital's treatment rooms, laboratories, wards, laundry rooms, X-ray studios and operating rooms, and its source and composition are very complex. Hospital sewage contains a large number of pathogenic bacteria, viruses and chemicals, and has the characteristics of space pollution, acute infection and latent infection.

[0003] As a hospital sewage treatment facility, it lacks professional maintenance, has weak management capabilities, and receives less attention. Therefore, it is necessary to select a treatment process with a high degree of automation, convenient operation and management, mature and simple treatment technology, and low labor intensity. Summary of the invention

[0004] In view of the above problems, the present invention provides a hospital sewage treatment system and a treatment method thereof. The wastewater effluent treated by the system has high-quality and stable water quality, and the process parameters are easy to control. It can remove ammonia nitrogen and difficult-to-degrade organic matter in the water, effectively sterilize and disinfect the water body, and is easy to operate and manage and easy to automatically control.

[0005] To solve the above problems, the technical solution adopted by the present invention is:

[0006] A hospital sewage treatment system, comprising a grid tank, a regulating tank, an anoxic tank, a contact oxidation tank, a secondary sedimentation tank and a disinfection tank connected in sequence according to the sewage treatment direction;

[0007] The grid pool is connected to an accident pool for removing floating objects from hospital wastewater and accident wastewater;

[0008] The regulating tank and the accident tank are both equipped with lifting pumps, and the regulating tank is used to homogenize the water quality and water quantity;

[0009] The anoxic pool is provided with a bioreactor for denitrification treatment to remove the total nitrogen index in the sewage;

[0010] The contact oxidation tank is divided into a membrane filter tank and a backwash tank, a sealing baffle is rotatably connected between the membrane filter tank and the backwash tank, a plurality of parallel membrane frames are fixedly connected at intervals on both sides of the sealing baffle, a plurality of membrane tubes are vertically installed on the frame, and a cleaning mechanism for cleaning the membrane tubes is installed in the backwash tank;

[0011] The secondary sedimentation tank and the contact oxidation tank are both equipped with a sludge return pump, the sludge return pump in the contact oxidation tank returns to the anoxic tank through a pipeline, the sludge return pump in the secondary sedimentation tank is connected to the sludge tank, and the sludge tank is connected to a sludge dewatering system;

[0012] The disinfection pool is externally connected to a chlorine dioxide generator, and the disinfected water is discharged to the outside through a pasteurization tank;

[0013] Aeration plates are installed at the bottom of the anoxic tank, contact oxidation tank and sludge tank;

[0014] The regulating tank, anoxic tank, contact oxidation tank, secondary sedimentation tank and disinfection tank are all externally connected with a deodorization system.

[0015] Preferably, the lift pump in the accident pool is connected to the grid pool via a pipeline, and the lift pump in the regulating pool is connected to the anoxic pool via a pipeline.

[0016] Preferably, the sludge dewatering system comprises a screw pump, a sludge dewatering machine and a PAM dosing device, the inlet and outlet ends of the screw pump are respectively connected to the sludge tank and the sludge dewatering machine, and the PAM dosing device is connected to the sludge dewatering machine.

[0017] Preferably, the deodorization system includes an induced draft fan and a photo-catalyzed activated carbon integrated machine, the air suction end of the induced draft fan is connected to the regulating tank, the anoxic tank, the contact oxidation tank, the secondary sedimentation tank and the disinfection tank through a pipeline, and the air outlet end of the induced draft fan is connected to the photo-catalyzed activated carbon integrated machine.

[0018] Preferably, the aeration plate comprises an aeration pipeline, a plurality of aeration plates are evenly distributed on the aeration pipeline, and the aeration pipeline is externally connected to a fan.

[0019] Preferably, hollow shafts are fixed to the central top and bottom of the sealing baffle, main pipes connected to the corresponding hollow shafts are fixed to both sides of the top and bottom of the sealing baffle, and three-way valves are installed at the connections, branch pipes corresponding to multiple membrane frames are fixed to the side walls of the main pipes, and the upper and lower ends of the multiple membrane tubes are respectively connected to the corresponding branch pipes, the end of the top hollow shaft is connected to the pump water pipe through a rotating joint, and the end of the bottom hollow shaft is connected to the backwash pipe through a rotating joint.

[0020] Preferably, the hollow shaft at the top extends out of the contact oxidation tank and is fixed with a gear, a hydraulic cylinder is fixedly installed on the top of the contact oxidation tank, a rack is fixed to the retracted end of the hydraulic cylinder, and the rack is meshed with the gear.

[0021] Preferably, sealing gaskets are installed on both sides of the sealing baffle, and the sealing gaskets are in contact with the inner wall of the oxidation tank.

[0022] Preferably, the cleaning mechanism includes a pair of cylinders fixedly mounted on the top of the contact oxidation tank, the retracted ends of the cylinders extend into the backwash tank and are fixed with an arc-shaped plate, the side walls of the arc-shaped plate are fixedly connected to a plurality of mounting arms, the plurality of mounting arms correspond to the gaps between a plurality of membrane frames, a pair of circular cavities are arranged in the mounting arms, a pair of push rods are elastically connected in the circular cavities through springs, the pair of push rods extend out of the circular cavities and are fixed with a push plate, and the springs are externally connected to a controller.

[0023] The present invention also provides a method for treating hospital sewage, comprising the following steps:

[0024] S1. Hospital wastewater directly enters the screen pool, and accident wastewater first enters the accident pool, and then is pumped into the screen pool through the lifting pump to remove large floating suspended solids in hospital wastewater and accident wastewater;

[0025] S2. Wastewater filtered in the screen pool flows into the regulating pool by gravity, homogenizing the water quality and water volume, controlling the concentration of pollutants in the wastewater, and then pumped into the anoxic pool through the lifting pump;

[0026] S3. Denitrification treatment is carried out in the anoxic tank to remove the total nitrogen index in the sewage, and the macromolecular organic matter is decomposed into small molecular and easily degradable organic matter through the action of the bioreactor;

[0027] S4. The wastewater treated in the anoxic tank flows into the contact oxidation tank by gravity, and is subjected to aerobic biochemical treatment in the membrane filter tank. Through the multiple membrane tubes on the membrane rack, the aeration disk inflates the tank. The multiple membrane tubes pass through the pump pipe, the top hollow shaft, the main pipe on the corresponding side and multiple branch pipes to filter the wastewater through the membrane tubes. The obtained reclaimed water is extracted, and the soluble macromolecular compounds with a long degradation time can be intercepted by the membrane and returned to the bioreactor together with the sludge, so that the residence time of these compounds in the bioreactor becomes longer, which is conducive to the degradation of these compounds by microorganisms;

[0028] S5. The water after aerobic biochemical treatment flows into the secondary sedimentation tank for solid-liquid separation, and the settled sludge is discharged into the sludge tank. The effluent from the secondary sedimentation tank flows into the disinfection tank by gravity, and the chlorine dioxide prepared by the chlorine dioxide generator is sent to the disinfection tank. The disinfected water is discharged through the pasteurization tank.

[0029] The beneficial effects of the present invention are:

[0030] 1. The effluent quality of the wastewater after treatment by the system is high-quality and stable, the process parameters are easy to control, it can remove ammonia nitrogen and difficult-to-degrade organic matter in the water, effectively sterilize and disinfect the water body, it is easy to operate and manage, and easy to automate.

[0031] 2. Add anoxic pools, add denitrification treatment processes to wastewater treatment, and improve the total nitrogen treatment capacity of the wastewater treatment system.

[0032] 3. Optimize the existing "contact oxidation tank + coagulation, flocculation tank + inclined tube sedimentation tank" treatment process to MBR treatment process. Cancel the mud hopper of the inclined tube sedimentation tank, change part of the tank capacity into an aerobic zone, and change the remaining part into a membrane tank of the MBR process, simplify the treatment process route, improve the degree of automation of the treatment process, and reduce the labor quota and labor intensity of the sewage treatment plant. Adopt the MBR treatment process based on membrane technology to improve the solid-liquid separation efficiency of the activated sludge treatment process. After treatment, the suspended solids in the effluent are less than 5mg / L, reduce the use of disinfectants, and improve the safety guarantee of effluent meeting the standards.

[0033] 4. Set up a deodorization system to optimize the operating environment of sewage treatment facilities. Use mechanical screens to remove floating objects in wastewater to prevent floating objects in sewage from entering subsequent equipment and treatment structures, reduce the load of subsequent treatment structures and prevent equipment blockage.

[0034] 5. Set up membrane filter tanks, backwash tanks and cleaning mechanisms to facilitate regular cleaning of membrane tubes on membrane racks. Use backwashing and vibration scraping to effectively scrape off attachments on the membrane surface, improve the use effect of membrane tubes and increase service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a structural schematic diagram of the present invention;

[0036] Figure 2 This is a schematic top view of the aeration plate proposed by the present invention;

[0037] Figure 3 It is a cross-sectional schematic diagram of the anoxic pool proposed by the present invention;

[0038] Figure 4 This is a schematic diagram of the contact oxidation tank structure proposed by the present invention;

[0039] Figure 5 A schematic top view of the contact oxidation tank proposed by the present invention;

[0040] Figure 6 A schematic cross-sectional view of the sealing partition proposed by the present invention;

[0041] Figure 7 A schematic top view of the cleaning mechanism proposed by the present invention;

[0042] Figure 8 A schematic cross-sectional view of the mounting arm proposed by the present invention;

[0043] Fig. 9 It is a schematic diagram of the system flow of the present invention.

[0044] In the figure: 1 grid tank, 2 regulating tank, 3 anoxic tank, 4 contact oxidation tank, 5 secondary sedimentation tank, 6 disinfection tank, 7 pasteurization tank, 8 sludge tank, 9 accident tank, 10 screw pump, 11 sludge dewatering machine, 12 PAM dosing equipment, 13 chlorine dioxide generator, 14 fan, 15 induced draft fan, 16 photocatalytic activated carbon integrated machine, 17 lift pump, 18 sludge return pump, 19 aeration plate, 20 membrane filter, 21 backwash tank, 22 sealing baffle, 23 sealing gasket, 24 hollow shaft, 25 branch pipe, 26 membrane frame, 27 main pipe, 28 arc plate, 29 mounting arm, 30 cylinder, 31 hydraulic cylinder, 32 rack, 33 gear, 34 pump water pipe, 35 membrane tube, 36 three-way valve, 37 backwash pipe, 38 back plate, 39 spring, 40 back rod, 41 aeration pipeline, 42 aeration plate, 43 bioreactor. DETAILED DESCRIPTION

[0045] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific implementation disclosed below.

[0046] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0047] Reference Figure 1-9 A hospital sewage treatment system includes a grille tank 1, a regulating tank 2, an anoxic tank 3, a contact oxidation tank 4, a secondary sedimentation tank 5 and a disinfection tank 6 which are sequentially connected according to the sewage treatment direction, and an automated treatment process.

[0048] The grille pool 1 is connected to the accident pool 9, which is used to remove floating objects in hospital wastewater and accident wastewater. The lifting pump 17 in the accident pool 9 is connected to the grille pool 1 through a pipeline, and the lifting pump 17 in the regulating pool 2 is connected to the anoxic pool 3 through a pipeline. Lifting pumps 17 are installed in both the regulating pool 2 and the accident pool 9. The regulating pool 2 is used to homogenize water quality and water quantity.

[0049] A bioreactor 43 is arranged in the anoxic pool 3 to carry out denitrification treatment to remove the total nitrogen index in the sewage.

[0050] The contact oxidation tank 4 is divided into a membrane filter tank 20 and a backwash tank 21. A sealing partition 22 is rotatably connected between the membrane filter tank 20 and the backwash tank 21. A plurality of parallel membrane frames 26 are fixedly connected at intervals on both sides of the sealing partition 22. A plurality of membrane tubes 35 are vertically installed on the frame 26. A cleaning mechanism for cleaning the membrane tubes 35 is installed in the backwash tank 21.

[0051] Furthermore, a hollow shaft 24 is fixed to the center top and bottom of the sealing partition 22, and a main pipe 27 connected to the corresponding hollow shaft 24 is fixed to both sides of the top and bottom of the sealing partition 22, and a three-way valve 36 is installed at the connection, and a branch pipe 25 corresponding to a plurality of membrane frames 26 is fixed to the side wall of the main pipe 27, and the upper and lower ends of the plurality of membrane tubes 35 are respectively connected to the corresponding branch pipe 25, and the end of the top hollow shaft 24 is connected to the pump water pipe 34 through a rotating joint, and the end of the bottom hollow shaft 24 is connected to the backwash pipe 37 through a rotating joint, which is located The membrane frame 26 on one side of the membrane filter tank 20 and the three-way valve 36 on the top connect the top hollow shaft 24 with the main pipe 27 on the corresponding side, the aeration plate 19 inflates the tank, and the multiple membrane tubes 35 filter the wastewater through the membrane tubes 35 through the pump pipe 34, the top hollow shaft 24, the main pipe 27 on the corresponding side and the multiple branch pipes 25. The obtained reclaimed water is extracted, and the soluble macromolecular compounds with a long degradation time can be intercepted by the membrane and returned to the bioreactor 43 together with the sludge. At this time, the membrane frame 26 on the other side is located in the backwash tank 21 for cleaning, and the conversion is convenient.

[0052] During backwashing, it is only necessary to rotate the bottom and top three-way valves 36 to connect the bottom hollow shaft 24 with the main pipe 27 on one side of the backwash tank 21, close the top main pipe 27 and the branch pipe 25, and inject water into the membrane tube 35 through the backwash pipe 37, the bottom hollow shaft 24, the bottom main pipe 27 and the branch pipe 25 to achieve backwashing.

[0053] Furthermore, the top hollow shaft 24 extends out of the contact oxidation tank 4 and is fixed with a gear 33. A hydraulic cylinder 31 is fixedly installed on the top of the contact oxidation tank 4. A rack 32 is fixed to the retracted end of the hydraulic cylinder 31. The rack 32 is meshed with the gear 33. Sealing gaskets 23 are installed on both sides of the sealing baffle 22. The sealing gasket 23 contacts the inner wall of the contact oxidation tank 4. Starting the hydraulic cylinder 31 drives the rack 32 to move, and the hollow shaft 24 is driven to rotate through the gear 33, thereby driving the sealing baffle 22 to rotate 180°, thereby realizing the conversion between cleaning and filtration.

[0054] Specifically, the cleaning mechanism includes a pair of cylinders 30 fixedly installed on the top of the contact oxidation tank 4, the retracted end of the cylinder 30 extends into the backwash tank 21 and is fixed with an arc plate 28, the side wall of the arc plate 28 is fixedly connected to a plurality of mounting arms 29, and the plurality of mounting arms 29 correspond to the gaps between the plurality of membrane frames 26, a pair of circular cavities are arranged in the mounting arms 29, a pair of push rods 40 are elastically connected in the circular cavities through springs 39, a pair of push rods 40 extend out of the circular cavities and are fixed with the push plate 38, the spring 39 is externally connected to a controller, the cylinder 30 is started to drive the arc plate 28 to descend, and then drive the plurality of mounting arms 29 to descend, passing through the gaps between the plurality of adjacent membrane frames 26, the controller intermittently supplies power to the spring 39, the spring 39 is energized to contract, and is reset when the power is off, and then the push plate 38 is driven to vibrate back and forth through the push rod 40, intermittently abutting against the surface of the membrane tube, vibrating the surrounding water flow, causing the attachments to fall off, and improving the cleaning effect.

[0055] A sludge return pump 18 is installed in both the secondary sedimentation tank 5 and the contact oxidation tank 4. The sludge return pump 18 in the contact oxidation tank 4 returns to the anoxic tank 3 through a pipeline. The sludge return pump 18 in the secondary sedimentation tank 5 is connected to the sludge tank 8. The sludge tank 8 is connected to a sludge dewatering system. The sludge dewatering system includes a screw pump 10, a sludge dewaterer 11 and a PAM dosing device 12. The inlet and outlet ends of the screw pump 10 are respectively connected to the sludge tank 8 and the sludge dewaterer 11. The PAM dosing device 12 is connected to the sludge dewaterer 11.

[0056] The disinfection tank 6 is connected to a chlorine dioxide generator 13, and the disinfected water is discharged to the outside through the pasteurization tank 7;

[0057] An aeration plate 19 is installed at the bottom of the anoxic tank 3, the contact oxidation tank 4 and the sludge tank 8. The aeration plate 19 includes an aeration pipeline 41. A plurality of aeration plates 42 are evenly distributed on the aeration pipeline 41. The aeration pipeline 41 is externally connected to the fan 14.

[0058] The regulating tank 2, the anoxic tank 3, the contact oxidation tank 4, the secondary sedimentation tank 5 and the disinfection tank 6 are all connected to an external deodorization system, which includes an induced draft fan 15 and a photo-activated carbon integrated machine 16. The air suction end of the induced draft fan 15 is connected to the regulating tank 2, the anoxic tank 3, the contact oxidation tank 4, the secondary sedimentation tank 5 and the disinfection tank 6 through a pipeline, and the air outlet end of the induced draft fan 15 is connected to the photo-activated carbon integrated machine 16.

[0059] Reference Fig. 9 The present invention also provides a method for treating hospital sewage, comprising the following steps:

[0060] S1, hospital wastewater directly enters the grid pool 1, accident wastewater first enters the accident pool 9, and then is pumped into the grid pool 1 through the lifting pump 17 to remove large floating suspended solids in the hospital wastewater and accident wastewater;

[0061] S2, the wastewater filtered by the grid pool 1 flows into the regulating pool 2 by gravity, the water quality and water volume are homogenized, the pollutant concentration in the wastewater is controlled, and the wastewater is pumped into the anoxic pool 3 by the lifting pump 17;

[0062] S3, denitrification treatment is carried out in the anoxic tank 3 to remove the total nitrogen index in the sewage, and the macromolecular organic matter is decomposed into small molecular and easily degradable organic matter through the action of the bioreactor 43;

[0063] S4, the wastewater treated in the anoxic tank 3 flows into the contact oxidation tank 4 by gravity, and is subjected to aerobic biochemical treatment in the membrane filter 20. The aeration plate 19 inflates the tank through the multiple membrane tubes 35 on the membrane frame 26. The multiple membrane tubes 35 pass through the pump pipe 34, the top hollow shaft 24, the main pipe 27 on the corresponding side and the multiple branch pipes 25 to filter the wastewater through the membrane tubes 35. The obtained reclaimed water is extracted, and the soluble macromolecular compounds with a long degradation time can be intercepted by the membrane and returned to the bioreactor 43 together with the sludge, so that the residence time of these compounds in the bioreactor becomes longer, which is conducive to the degradation of these compounds by microorganisms;

[0064] S5. The water after aerobic biochemical treatment flows into the secondary sedimentation tank 5 for solid-liquid separation, and the settled sludge is discharged into the sludge tank 8. The effluent from the secondary sedimentation tank 5 flows into the disinfection tank 6 by gravity, and the chlorine dioxide prepared by the chlorine dioxide generator 13 is sent to the disinfection tank 6. The disinfected water is discharged through the pasteurization tank 7.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A hospital sewage treatment system, characterized in that: It comprises a screen tank (1), a regulating tank (2), an anoxic tank (3), a contact oxidation tank (4), a secondary sedimentation tank (5) and a disinfection tank (6) which are connected in sequence according to the sewage treatment direction; The grid pool (1) is connected to an accident pool (9) for removing floating objects from hospital wastewater and accident wastewater; The regulating tank (2) and the accident tank (9) are both equipped with a lifting pump (17), and the regulating tank (2) is used to homogenize water quality and water quantity; The anoxic pool (3) is provided with a bioreactor (43) for performing denitrification treatment to remove the total nitrogen index in the sewage; The contact oxidation tank (4) is divided into a membrane filter tank (20) and a backwash tank (21), a sealing baffle (22) is rotatably connected between the membrane filter tank (20) and the backwash tank (21), a plurality of parallel membrane frames (26) are fixedly connected at intervals on both sides of the sealing baffle (22), a plurality of membrane tubes (35) are vertically installed on the frame (26), and a cleaning mechanism for cleaning the membrane tubes (35) is installed in the backwash tank (21); The secondary sedimentation tank (5) and the contact oxidation tank (4) are both equipped with a sludge return pump (18). The sludge return pump (18) in the contact oxidation tank (4) returns to the anoxic tank (3) through a pipeline. The sludge return pump (18) in the secondary sedimentation tank (5) is connected to the sludge tank (8), and the sludge tank (8) is connected to a sludge dewatering system. The disinfection pool (6) is externally connected to a chlorine dioxide generator (13), and the disinfected water is discharged to the outside through a pasteurization tank (7); Aeration plates (19) are installed at the bottom of the anoxic tank (3), the contact oxidation tank (4) and the sludge tank (8); The regulating tank (2), the anoxic tank (3), the contact oxidation tank (4), the secondary sedimentation tank (5) and the disinfection tank (6) are all externally connected to a deodorization system.

2. A hospital sewage treatment system according to claim 1, characterized in that: The lift pump (17) in the accident pool (9) is connected to the grid pool (1) via a pipeline, and the lift pump (17) in the regulating pool (2) is connected to the anoxic pool (3) via a pipeline.

3. A hospital sewage treatment system according to claim 1, characterized in that: The sludge dewatering system comprises a screw pump (10), a sludge dewatering machine (11) and a PAM dosing device (12); the inlet end and the outlet end of the screw pump (10) are respectively connected to a sludge pool (8) and the sludge dewatering machine (11); and the PAM dosing device (12) is connected to the sludge dewatering machine (11).

4. A hospital sewage treatment system according to claim 1, characterized in that: The deodorization system comprises an induced draft fan (15) and a photocatalytic activated carbon integrated machine (16); the air suction end of the induced draft fan (15) is connected to a regulating tank (2), an anoxic tank (3), a contact oxidation tank (4), a secondary sedimentation tank (5) and a disinfection tank (6) through a pipeline; and the air outlet end of the induced draft fan (15) is connected to the photocatalytic activated carbon integrated machine (16).

5. A hospital sewage treatment system according to claim 1, characterized in that: The aeration plate (19) comprises an aeration pipeline (41), a plurality of aeration plates (42) are evenly distributed on the aeration pipeline (41), and the aeration pipeline (41) is externally connected to a fan (14).

6. A hospital sewage treatment system according to claim 1, characterized in that: A hollow shaft (24) is fixed to the center top and bottom of the sealing baffle (22), and a main pipe (27) connected to the corresponding hollow shaft (24) is fixed to both sides of the top and bottom of the sealing baffle (22), and a three-way valve (36) is installed at the connection. Branch pipes (25) corresponding to multiple membrane frames (26) are fixed to the side wall of the main pipe (27), and the upper ends and lower ends of the multiple membrane tubes (35) are respectively connected to the corresponding branch pipes (25). The end of the top hollow shaft (24) is connected to the pump water pipe (34) through a rotating joint, and the end of the bottom hollow shaft (24) is connected to the backwash pipe (37) through a rotating joint.

7. A hospital sewage treatment system according to claim 6, characterized in that: The hollow shaft (24) at the top extends out of the contact oxidation tank (4) and is fixed with a gear (33). A hydraulic cylinder (31) is fixedly installed on the top of the contact oxidation tank (4). A rack (32) is fixed at the retracted end of the hydraulic cylinder (31), and the rack (32) is meshed with the gear (33).

8. A hospital sewage treatment system according to claim 1, characterized in that: Sealing gaskets (23) are installed on both sides of the sealing partition (22), and the sealing gaskets (23) are in contact with the inner wall of the contact oxidation tank (4).

9. A hospital sewage treatment system according to claim 1, characterized in that: The cleaning mechanism includes a pair of cylinders (30) fixedly mounted on the top of the contact oxidation tank (4), the retracted end of the cylinder (30) extending into the backwash tank (21) and fixed with an arc plate (28), the side wall of the arc plate (28) is fixedly connected with a plurality of mounting arms (29), the plurality of mounting arms (29) corresponding to the gaps between a plurality of membrane frames (26), a pair of circular cavities are arranged in the mounting arms (29), a pair of push rods (40) are elastically connected in the circular cavities through springs (39), the pair of push rods (40) extend out of the circular cavities and are fixed with a push plate (38), and the springs (39) are externally connected to a controller.

10. A method for treating a hospital sewage treatment system according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1, hospital wastewater directly enters the screen pool (1), accident wastewater first enters the accident pool (9), and then is pumped into the screen pool (1) through the lifting pump (17) to remove large floating objects in the hospital wastewater and accident wastewater; S2, the wastewater filtered by the grid pool (1) flows into the regulating pool (2) by gravity, the water quality and water volume are homogenized, the concentration of pollutants in the wastewater is controlled, and the wastewater is pumped into the anoxic pool (3) through the lifting pump (17); S3, denitrification treatment is carried out in the anoxic tank (3) to remove the total nitrogen index in the sewage, and the macromolecular organic matter is decomposed into small molecular and easily degradable organic matter through the action of the bioreactor (43); S4, the wastewater treated in the anoxic tank (3) flows by gravity into the contact oxidation tank (4), and is subjected to aerobic biochemical treatment in the membrane filter tank (20). The multiple membrane tubes (35) on the membrane frame (26) and the aeration disk (19) are used to inflate the tank. The multiple membrane tubes (35) are passed through the pump pipe (34), the top hollow shaft (24), the main pipe (27) on the corresponding side and the multiple branch pipes (25). The wastewater is filtered through the membrane tubes (35), and the obtained reclaimed water is extracted. Soluble macromolecular compounds with a long degradation time can be intercepted by the membrane and returned to the bioreactor (43) together with the sludge, so that the residence time of these compounds in the bioreactor is prolonged, thereby facilitating the degradation of these compounds by microorganisms; S5. The water after aerobic biochemical treatment flows into the secondary sedimentation tank (5) for solid-liquid separation, and the settled sludge is discharged into the sludge tank (8). The effluent from the secondary sedimentation tank (5) flows into the disinfection tank (6) by gravity, and chlorine dioxide is prepared by the chlorine dioxide generator (13) and sent to the disinfection tank (6). The disinfected water is discharged through the pasteurization tank (7).

Images