An MBR integrated sewage treatment system and sewage treatment process

Abstract

The present application relates to an MBR integrated sewage treatment system and sewage treatment process, including a biological reactor, a membrane biological reactor and a filtering device. The biological reactor is used to place sludge that can degrade pollutants in sewage, and a water inlet pipe connected to the inside of the biological reactor is provided on one side of the biological reactor; the membrane biological reactor is located on the side of the biological reactor away from the water inlet pipe, the membrane biological reactor is connected to the biological reactor, and a water outlet pipe connected to the membrane biological reactor is provided on the end of the membrane biological reactor away from the biological reactor; the filtering device is located in the membrane biological reactor, and the filtering device includes a plurality of fixed frames, and a plurality of MBR filter membranes are staggered and stacked in the fixed frames. The present application has the effect that the staggered and stacked MBR filter membranes provide a certain support force to each other, thereby reducing the damage of the shear force of the water flow to the MBR filter membrane, thereby reducing the replacement frequency of the MBR filter membrane.

Description

Technical Field

[0001] The present invention relates to the field of sewage treatment, and in particular to an MBR integrated sewage treatment system and a sewage treatment process. Background Art

[0002] The MBR integrated sewage treatment system is an advanced sewage treatment technology that combines traditional biological treatment processes with membrane separation technology to more efficiently remove organic matter, nitrogen, phosphorus and other pollutants in sewage, producing clear and transparent wastewater that can be used for recycling or direct discharge.

[0003] In the prior art, there is an MBR integrated sewage treatment device, which includes an anaerobic tank, an aerobic tank, a membrane bioreactor tank, a filtration device, an inlet pipe and an outlet pipe. After the sewage enters the bioreactor tank through the inlet pipe, microorganisms convert pollutants in the sewage into biomass and gas by degrading organic matter. Then, the membrane bioreactor tank uses a microporous membrane to intercept microorganisms and suspended matter in the water in the reactor, thereby achieving solid-liquid separation and ensuring the quality of effluent.

[0004] Regarding the above-mentioned related technologies, when the flow rate of sewage in the membrane biological reactor is high, the water flow will generate a large shear force on the MBR filter membrane, thereby breaking the fibers in the MBR filter membrane, thereby causing a high frequency of replacement of the MBR filter membrane. Summary of the invention

[0005] In order to reduce the replacement frequency of MBR filter membranes, the present application provides an MBR integrated sewage treatment system and a sewage treatment process.

[0006] An MBR integrated sewage treatment system, comprising:

[0007] A biological reaction tank, wherein the biological reaction tank is used to place sludge that can degrade pollutants in sewage, and one side of the biological reaction tank is provided with a water inlet pipe connected to the inside of the biological reaction tank;

[0008] A membrane biological reaction tank, wherein the membrane biological reaction tank is located on a side of the biological reaction tank away from the water inlet pipe, the membrane biological reaction tank is connected with the biological reaction tank, and an end of the membrane biological reaction tank away from the biological reaction tank is provided with a water outlet pipe connected with the membrane biological reaction tank;

[0009] The filtering device is located in a membrane biological reaction tank and comprises a plurality of fixed frames, wherein a plurality of MBR filtering membranes are staggered and stacked and connected in the fixed frames.

[0010] By adopting the above technical solution, when the treatment system is working, the sewage enters the bioreactor through the water inlet pipe, the activated sludge in the bioreactor degrades the organic pollutants in the sewage through microorganisms, and then enters the membrane bioreactor. The MBR filter membrane in the membrane bioreactor intercepts the microorganisms, suspended solids and macromolecular organic matter in the sewage, so that the sludge concentration in the bioreactor can be maintained at a high level, thereby improving the biodegradation efficiency; in the process of sewage flowing through the membrane bioreactor, the sewage flow will generate impact force on the MBR filter membrane. At this time, the MBR filter membranes that are staggered and stacked provide each other with a certain support force, thereby reducing the damage to the MBR filter membrane caused by the shear force of the water flow, thereby reducing the replacement frequency of the MBR filter membrane.

[0011] Optionally, a fixing groove is provided on the inner side of the fixing frame, and fixing blocks are provided at both ends of the MBR filter membrane, and the fixing blocks are detachably connected to the fixing frame through the fixing groove.

[0012] By adopting the above technical solution, when installing the MBR filter membrane, the MBR filter membrane is first stacked in an interlaced manner, and then the fixing blocks at both ends of the MBR filter membrane are placed in the fixing grooves, thereby realizing the installation of the MBR filter membrane. When one of the MBR filter membranes is damaged, only the damaged MBR filter membrane needs to be replaced, thereby reducing the replacement cost of the MBR filter membrane.

[0013] Optionally, the fixing frame includes a first fixing frame, the first fixing frame is detachably connected to a second fixing frame, and the fixing block is located between the first fixing frame and the second fixing frame.

[0014] By adopting the above technical solution, when the fixing blocks at both ends of the MBR filter membrane are placed in the fixing grooves, the first fixing frame is separated from the second fixing frame. After the fixing blocks at both ends of the MBR filter membrane are aligned with the first fixing frame or the second fixing frame, the first fixing frame is overlapped with the second fixing frame.

[0015] Optionally, the first fixed frame and the second fixed frame are connected with a locking member, and the locking member includes a connecting plate, both ends of the connecting plate are connected with locking plates, the width between the locking plates at both ends of the connecting plate is greater than the thickness of the fixed frame, and a threaded hole is opened on one side of the locking plate, and a screw is arranged in the threaded hole.

[0016] By adopting the above technical solution, after the first fixed frame overlaps with the second fixed frame, the fixed frame is placed between the locking plates located at both ends of the connecting plate, and then the screw is rotated so that one end of the screw abuts against the outer wall of the fixed frame, thereby achieving the fixation of the first fixed frame and the second fixed frame.

[0017] Optionally, there is a certain gap between the fixing groove and the mounting block, and an elastic member is provided on a side of the mounting block facing the MBR filter membrane, and an end of the elastic member facing away from the mounting block is connected to the fixing groove.

[0018] By adopting the above technical solution, under normal circumstances, the elastic member pushes the mounting block away from the MBR filter membrane. When turbulence occurs in the membrane biological reactor, the water flow impacts the MBR filter membrane. At this time, the elastic member continuously expands and contracts under the action of forces in different directions, providing a certain degree of buffering for the MBR filter membrane, thereby further reducing the risk of damage to the MBR filter membrane.

[0019] Optionally, the elastic member includes a spring, one end of the spring is connected to the side of the mounting block facing the MBR filter membrane, one end of the spring facing away from the mounting block is connected to the mounting plate, and one end of the mounting plate facing away from the spring abuts against the wall of the fixed groove.

[0020] By adopting the above technical solution, when water flows into the MBR filter membrane, the spring continuously expands and contracts under the action of forces in different directions. Since the contact area between the mounting plate and the wall of the fixed groove is large, the risk of spring dislocation is reduced.

[0021] Optionally, the membrane biological reactor is further connected to an air intake device, and the air intake device is used to flush air into the membrane biological reactor.

[0022] By adopting the above technical solution, the air flow and water flow generated by the air intake device can reduce the deposition of sludge on the surface of the MBR filter membrane, thereby reducing the pollution and clogging of the MBR filter membrane.

[0023] Optionally, the air intake device comprises an air intake pipe connected to the membrane biological reactor tank, and an air intake blower is provided at one end of the air intake pipe away from the membrane biological reactor tank.

[0024] By adopting the above technical solution, when the air intake device is working, the air intake blower is started, and the air intake blower transports air into the membrane biological reaction tank through the air intake pipe.

[0025] Optionally, the membrane biological reactor includes an anaerobic tank connected to a water inlet pipe, the end of the anaerobic tank away from the water inlet pipe is connected to an aerobic tank connected to the anaerobic tank, the aerobic tank is used to store activated sludge, the anaerobic tank is used to store anaerobic sludge, and the membrane biological reactor is connected to the anaerobic tank.

[0026] By adopting the above technical solution, the anaerobic sludge in the anaerobic tank treats the high-concentration organic matter in the sewage, converts it into methane and carbon dioxide through anaerobic bacterial digestion, and then the activated sludge in the aerobic tank further converts these intermediate products into harmless substances.

[0027] An MBR integrated sewage treatment process comprises the following steps:

[0028] S1. The sewage is transported to the bioreactor through the water inlet pipe, and the pollutants in the sewage are degraded by the sludge in the bioreactor;

[0029] S2. After being degraded, the sewage enters the membrane bioreactor tank, and the sewage contacts the filtering device in the membrane bioreactor tank;

[0030] S3. The sewage contacts with a plurality of MBR filter membranes which are stacked and connected in an interlaced manner in the fixed frame. The MBR filter membranes retain microorganisms and suspended matter in the water in the reactor, thereby achieving solid-liquid separation.

[0031] In summary, the present application includes at least one of the following beneficial technical effects:

[0032] 1. When the treatment system is working, sewage enters the bioreactor through the water inlet pipe. The activated sludge in the bioreactor degrades the organic pollutants in the sewage through microorganisms, and then enters the membrane bioreactor. The MBR filter membrane in the membrane bioreactor intercepts the microorganisms, suspended solids and macromolecular organic matter in the sewage, so that the sludge concentration in the bioreactor can be maintained at a high level, improving the biodegradation efficiency; when the sewage flows through the membrane bioreactor, the sewage flow will produce impact force on the MBR filter membrane. At this time, the staggered and stacked MBR filter membranes provide a certain support force to each other, thereby reducing the damage to the MBR filter membrane caused by the shear force of the water flow, thereby reducing the replacement frequency of the MBR filter membrane;

[0033] 2. When installing the MBR filter membrane, first stack the MBR filter membranes in an interlaced manner, and then put the fixing blocks at both ends of the MBR filter membranes into the fixing grooves to achieve the installation of the MBR filter membranes. When one of the MBR filter membranes is damaged, only the damaged MBR filter membrane needs to be replaced, thereby reducing the replacement cost of the MBR filter membranes;

[0034] 3. Under normal circumstances, the elastic piece pushes the mounting block away from the MBR filter membrane. When turbulence occurs in the membrane biological reactor, the water flow impacts the MBR filter membrane. At this time, the elastic piece continuously expands and contracts under the action of forces in different directions, providing a certain degree of buffering for the MBR filter membrane, thereby further reducing the risk of damage to the MBR filter membrane. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application;

[0036] Figure 2 is a top view of an embodiment of the present application;

[0037] Figure 3 yes Figure 2 Schematic diagram of the cross-sectional structure at AA in the middle;

[0038] Figure 4 yes Figure 2 Schematic diagram of the cross-sectional structure at the middle BB;

[0039] Figure 5 yes Figure 4 A partial enlarged schematic diagram of part C in the middle;

[0040] In the figure: 1. biological reactor; 11. aerobic tank; 12. anaerobic tank; 2. membrane biological reactor; 3. filtering device; 31. fixing frame; 311. fixing groove; 312. first fixing frame; 313. second fixing frame; 32. MBR filter membrane; 33. fixing block; 34. locking piece; 341. connecting plate; 342. locking plate; 343. threaded hole; 344. screw; 35. elastic piece; 351. spring; 352. mounting plate; 4. air intake device; 41. air intake pipe; 42. air intake blower; 5. water inlet pipe; 6. water outlet pipe. DETAILED DESCRIPTION

[0041] The following is combined with Figure 1-5 This application is described in further detail.

[0042] The present application embodiment discloses an MBR integrated sewage treatment system. Figure 1 and Figure 2 An MBR integrated sewage treatment system includes a biological reaction tank 1 and a membrane biological reaction tank 2. The biological reaction tank 1 is used to place activated sludge that can degrade pollutants in sewage. One side of the biological reaction tank 1 is provided with an inlet pipe 5 connected to the inside of the biological reaction tank 1.

[0043] Reference Figure 2 and Figure 3 The membrane biological reactor 2 is located on the side of the biological reactor 1 away from the water inlet pipe 5, and the membrane biological reactor 2 is connected to the biological reactor 1. The end of the membrane biological reactor 2 away from the biological reactor 1 is provided with an outlet pipe 6 connected to the membrane biological reactor 2. A filtering device 3 is provided in the membrane biological reactor 2, and the filtering device 3 includes a plurality of fixed frames 31, and a plurality of MBR filter membranes 32 are staggered and stacked in the fixed frames 31; the membrane biological reactor 2 is also connected to an air intake device 4, and the air intake device 4 is used to flush air into the membrane biological reactor 2.

[0044] When the treatment system is working, the sewage enters the bioreactor 1 through the water inlet pipe 5. The activated sludge in the bioreactor 1 degrades the organic pollutants in the sewage through microorganisms, and then enters the membrane bioreactor 2. The MBR filter membrane 32 in the membrane bioreactor 2 intercepts the microorganisms, suspended solids and macromolecular organic matter in the sewage, so that the sludge concentration in the bioreactor 1 can be maintained at a high level, thereby improving the biodegradation efficiency. When the sewage flows through the membrane bioreactor 2, the sewage flow will generate an impact force on the MBR filter membrane 32. At this time, the MBR filter membranes stacked on top of each other 32 provide a certain supporting force to each other, thereby reducing the damage of the shear force of the water flow to the MBR filter membrane 32, thereby reducing the replacement frequency of the MBR filter membrane 32. At the same time, since the filter membrane is composed of a plurality of staggered and stacked MBR filter membranes 32, the size of a single MBR filter membrane 32 is reduced to a certain extent, thereby reducing the production difficulty; at the same time, when the treatment system is working, the air intake device 4 flushes air into the membrane bioreactor 2, and the air flow and water flow generated by the air intake device 4 reduce the deposition of sludge on the surface of the MBR filter membrane 32, thereby reducing the pollution and clogging of the MBR filter membrane 32.

[0045] Reference Figure 1 and Figure 2 The membrane biological reactor 2 includes an anaerobic tank 12 connected to the water inlet pipe 5. The end of the anaerobic tank 12 away from the water inlet pipe 5 is connected to an aerobic tank 11 connected to the anaerobic tank 12. The aerobic tank 11 is used to store activated sludge, and the anaerobic tank 12 is used to store anaerobic sludge. The membrane biological reactor 2 is connected to the anaerobic tank 12; the anaerobic sludge in the anaerobic tank 12 processes the high-concentration organic matter in the sewage, and converts it into methane and carbon dioxide through anaerobic bacterial digestion, and then the activated sludge in the aerobic tank 11 further converts these intermediate products into harmless substances.

[0046] Reference Figure 4 and Figure 5A fixing groove 311 is provided inside the fixing frame 31, and fixing blocks 33 are provided at both ends of the MBR filter membrane 32. The fixing blocks 33 are detachably connected to the fixing frame 31 through the fixing groove 311; the fixing frame 31 includes a first fixing frame 312, and the first fixing frame 312 is detachably connected to the second fixing frame 313. The fixing block 33 is located between the first fixing frame 312 and the second fixing frame 313. The separation and combination of the fixing block 33 and the fixing frame 31 can be realized by separating and combining the first fixing frame 312 and the second fixing frame 313; when installing the MBR filter membrane 32, firstly, the MBR filter membrane 32 is The first fixing frame 312 and the second fixing frame 313 are staggered and then separated. When the fixing blocks 33 at both ends of the MBR filter membrane 32 are aligned with the first fixing frame 312 or the second fixing frame 313, the first fixing frame 312 and the second fixing frame 313 are overlapped. At this time, the fixing blocks 33 at both ends of the MBR filter membrane 32 are located in the fixing groove 311, thereby realizing the installation of the MBR filter membrane 32. When one of the MBR filter membranes 32 is damaged, only the damaged MBR filter membrane 32 needs to be replaced, thereby reducing the replacement cost of the MBR filter membrane 32.

[0047] Reference Figure 4 and Figure 5 There is a certain gap between the fixing groove 311 and the mounting block. An elastic member 35 is provided on the side of the mounting block facing the MBR filter membrane 32. The elastic member 35 includes a spring 351. One end of the spring 351 is connected to the side of the mounting block facing the MBR filter membrane 32. The end of the spring 351 away from the mounting block is connected to the mounting piece 352. The end of the mounting piece 352 away from the spring 351 is in contact with the groove wall of the fixing groove 311. Under normal conditions, the spring 351 pushes the mounting block away from the MBR filter membrane 32. When turbulence occurs in the membrane biological reactor 2, the water flow impacts MBR filter membrane 32, at this time, the spring 351 continuously expands and contracts under the action of forces in different directions, providing a certain degree of buffering for the MBR filter membrane 32, thereby further reducing the risk of damage to the MBR filter membrane 32; at the same time, during the process of water flow impacting the MBR filter membrane 32, the spring 351 continuously expands and contracts under the action of forces in different directions. At this time, due to the large contact area between the mounting piece 352 and the wall of the fixed groove 311, the force between the mounting piece 352 and the wall of the fixed groove 311 is increased, thereby reducing the risk of dislocation of the spring 351.

[0048] Reference Figure 4 and Figure 5The first fixing frame 312 and the second fixing frame 313 are connected with a locking member 34, and the locking member 34 includes a connecting plate 341, and locking plates 342 are connected to both ends of the connecting plate 341. The width between the locking plates 342 at both ends of the connecting plate 341 is greater than the thickness of the fixing frame 31, and a threaded hole 343 is opened on one side of the locking plate 342 and penetrates the locking plate 342. A screw 344 is arranged in the threaded hole 343; after the first fixing frame 312 and the second fixing frame 313 are overlapped, the fixing frame 31 is placed between the locking plates 342 at both ends of the connecting plate 341, and then the screw 344 is rotated so that one end of the screw 344 abuts against the outer wall of the fixing frame 31, thereby achieving the fixation of the first fixing frame 312 and the second fixing frame 313.

[0049] Reference Figure 2 and Figure 3 The air intake device 4 includes an air intake pipe 41 connected to the membrane biological reactor 2, and an air intake blower 42 is provided at one end of the air intake pipe 41 away from the membrane biological reactor 2; when the air intake device 4 is working, the air intake blower 42 is started, and the air intake blower 42 transports air into the membrane biological reactor 2 through the air intake pipe 41. The air flow and water flow generated by the air intake blower 42 reduce the deposition of sludge on the surface of the MBR filter membrane 32, thereby reducing the pollution and blockage of the MBR filter membrane 32.

[0050] The implementation principle of an MBR integrated sewage treatment system in the embodiment of the present application is as follows: sewage enters the bioreactor 1 through the water inlet pipe 5, the activated sludge in the bioreactor 1 degrades the organic pollutants in the sewage through microorganisms, and then enters the membrane bioreactor 2, the MBR filter membrane 32 in the membrane bioreactor 2 intercepts the microorganisms, suspended solids and macromolecular organic matter in the sewage, so that the sludge concentration in the bioreactor 1 can be maintained at a high level, thereby improving the biodegradation efficiency; when the sewage flows through the membrane bioreactor 2, the sewage flow will generate an impact force on the MBR filter membrane 32, at which time the MB The R filter membranes 32 provide a certain supporting force to each other, thereby reducing the damage of the shear force of the water flow to the MBR filter membrane 32, thereby reducing the replacement frequency of the MBR filter membrane 32; when turbulence occurs in the membrane biological reactor 2, the elastic member 35 continuously expands and contracts under the action of forces in different directions, providing a certain degree of buffering for the MBR filter membrane 32. In addition, during the operation of the treatment system, the air intake blower 42 transports air into the membrane biological reactor 2 through the air intake pipe 41. The air flow and water flow generated by the air intake blower 42 reduce the deposition of sludge on the surface of the MBR filter membrane 32, thereby reducing the pollution and blockage of the MBR filter membrane 32.

[0051] The present application also discloses an MBR integrated sewage treatment process, referring to Figure 1 and Figure 2 , an MBR integrated sewage treatment process includes the following steps:

[0052] S1. The sewage is transported to the bioreactor 1 through the water inlet pipe 5, and the pollutants in the sewage are degraded by the sludge in the bioreactor 1;

[0053] S2. After being degraded, the sewage enters the membrane bioreactor 2, and then the sewage contacts the filtration device 3 in the membrane bioreactor 2;

[0054] S3. The sewage contacts with a plurality of MBR filter membranes 32 which are stacked and connected in an interlaced manner in the fixed frame 31. Then, the MBR filter membranes 32 retain the microorganisms and suspended matter in the water in the reactor, thereby achieving solid-liquid separation.

[0055] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An MBR integrated sewage treatment system, characterized in that: include: A biological reaction tank (1), the biological reaction tank (1) being used to store sludge capable of degrading pollutants in sewage, and a water inlet pipe (5) communicating with the interior of the biological reaction tank (1) being provided on one side of the biological reaction tank (1); A membrane bioreactor (2), the membrane bioreactor (2) being located on a side of the bioreactor (1) away from the water inlet pipe (5), the membrane bioreactor (2) being connected to the bioreactor (1), and an outlet pipe (6) connected to the membrane bioreactor (2) being provided at one end of the membrane bioreactor (2) away from the bioreactor (1); A filtration device (3), the filtration device (3) being located in a membrane biological reactor (2), the filtration device (3) comprising a plurality of fixing frames (31), a plurality of MBR filter membranes (32) being staggered and stacked and connected in a single fixing frame (31); a fixing groove (311) is provided on the inner side of the fixing frame (31), fixing blocks (33) are provided at both ends of the MBR filter membrane (32), and the fixing blocks (33) are detachably connected to the fixing frame (31) via the fixing groove (311).

2. The MBR integrated sewage treatment system according to claim 1, characterized in that: The fixing frame (31) comprises a first fixing frame (312), the first fixing frame (312) being detachably connected to a second fixing frame (313), and the fixing block (33) being located between the first fixing frame (312) and the second fixing frame (313).

3. The MBR integrated sewage treatment system according to claim 2 is characterized in that: The first fixing frame (312) and the second fixing frame (313) are connected with a locking member (34), and the locking member (34) comprises a connecting plate (341), both ends of the connecting plate (341) are connected with locking plates (342), the width between the locking plates (342) at both ends of the connecting plate (341) is greater than the thickness of the fixing frame (31), and a threaded hole (343) penetrating the locking plate (342) is provided on one side of the locking plate (342), and a screw (344) is provided in the threaded hole (343).

4. The MBR integrated sewage treatment system according to claim 3 is characterized in that: There is a certain gap between the fixing groove (311) and the fixing block (33); an elastic member (35) is provided on a side of the fixing block (33) facing the MBR filter membrane (32); and an end of the elastic member (35) facing away from the fixing block (33) is connected to the fixing groove (311).

5. The MBR integrated sewage treatment system according to claim 4 is characterized in that: The elastic member (35) comprises a spring (351), one end of the spring (351) being connected to a side of the fixing block (33) facing the MBR filter membrane (32), one end of the spring (351) facing away from the fixing block (33) being connected to a mounting plate (352), and one end of the mounting plate (352) facing away from the spring (351) being in contact with a groove wall of the fixing groove (311).

6. The MBR integrated sewage treatment system according to claim 1, characterized in that: The membrane biological reaction tank (2) is also connected to an air intake device (4), and the air intake device (4) is used to fill air into the membrane biological reaction tank (2).

7. The MBR integrated sewage treatment system according to claim 6, characterized in that: The air intake device (4) comprises an air intake pipe (41) connected to the membrane biological reaction tank (2); an air intake blower (42) is provided at one end of the air intake pipe (41) facing away from the membrane biological reaction tank (2).

8. The MBR integrated sewage treatment system according to claim 1, characterized in that: The membrane biological reaction tank (2) comprises an aerobic tank (11) connected to a water inlet pipe (5); one end of the aerobic tank (11) away from the water inlet pipe (5) is connected to an anaerobic tank (12); the aerobic tank (11) is used to store activated sludge, the anaerobic tank (12) is used to store anaerobic sludge, and the membrane biological reaction tank (2) is connected to the anaerobic tank (12).

9. An MBR integrated sewage treatment process, based on the MBR integrated sewage treatment system according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1. The sewage is transported to the biological reaction tank (1) through the water inlet pipe (5), and the pollutants in the sewage are degraded by the sludge in the biological reaction tank (1); S2. After being degraded, the sewage enters the membrane bioreactor (2), and the sewage contacts the filtering device (3) in the membrane bioreactor (2); S3. The sewage contacts the multiple MBR filter membranes (32) which are staggered and connected in the fixed frame (31). The MBR filter membranes (32) retain the microorganisms and suspended matter in the water in the reactor, thereby achieving solid-liquid separation.

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