CN116081807A

CN116081807A - Sewage biochemical treatment device

Info

Publication number: CN116081807A
Application number: CN202310251190.3A
Authority: CN
Inventors: 冯丽霞; 刘丹丹; 施泰安
Original assignee: Hezheng Environmental Protection Engineering Co ltd
Current assignee: Hezheng Environmental Protection Engineering Co ltd
Priority date: 2023-03-16
Filing date: 2023-03-16
Publication date: 2023-05-09
Anticipated expiration: 2043-03-16
Also published as: CN116081807B

Abstract

The invention belongs to sewage treatment equipment, and discloses a sewage biochemical treatment device, wherein the prior art directly adds activated sludge into a treatment tank, the activated sludge can be treated after the sewage in the treatment tank is discharged, in addition, a pipeline is arranged at the bottom of the treatment tank, the pressure received by an air outlet valve on the pipeline can be increased along with the increase of sewage quantity, and then high-pressure air is required to be filled, so that the pipeline is damaged due to overlarge pressure.

Description

Sewage biochemical treatment device

Technical Field

The invention belongs to sewage treatment equipment, and particularly relates to a sewage biochemical treatment device.

Background

The sewage is discharged water from life and production, the original use function is lost, along with the improvement of the living standard of people and the rapid development of industry, the discharge amount of the sewage is also increased, and the sewage is required to be treated in order to meet the water quality requirement of being discharged into a certain water body or reused. Biochemical treatment is a common sewage treatment mode, and biological treatment is generally adopted, so that an activated sludge method is widely applied to sewage treatment, and mainly because activated sludge contains a large amount of active microorganisms, the microorganisms can rapidly and effectively remove organic matters in sewage.

When the activated sludge method is utilized to treat sewage in the prior art, the activated sludge is directly added into a treatment tank, the activated sludge is discharged in a subsequent precipitation mode, the static precipitation speed is low, the activated sludge can be treated after the sewage in the treatment tank is discharged, in addition, the existing aeration device is provided with a pipeline at the bottom of the treatment tank, the pressure received by an air outlet valve on the pipeline can be increased along with the increase of the sewage quantity, and then high-pressure gas is required to be filled, so that the pipeline is damaged due to overlarge pressure.

Disclosure of Invention

In order to solve the defects in the prior art, the invention aims to provide the sewage biochemical treatment device, which can be used for disassembling and installing the external spiral pipe so as to realize the replacement of the activated sludge block and the cleaning of the external spiral pipe, and is convenient to use.

The technical scheme adopted for solving the technical problems of the sewage biochemical treatment device is as follows:

the utility model provides a sewage biochemical treatment device, the power distribution device comprises a tank body, the bottom of the jar body is provided with the supporting leg, the top of the jar body is provided with the feed liquor pipe, be provided with the several baffle in the jar body and divide into the several compartment with the jar body, the screw has all been seted up with the top surface and the bottom surface of the jar body to the baffle, still including the outer screwed pipe of several sections, the external screw thread and screw thread cooperation of outer screwed pipe, the lower extreme of outer screwed pipe all seals, the outer end of outer screwed pipe is fixed mounting respectively has the screw rod, the inner wall upper portion of outer screwed pipe is provided with the internal thread and with screw thread cooperation, the periphery of outer screwed pipe has seted up the vertical groove of penetrating respectively, the top and the external intercommunication of groove are wedge structure, be provided with the net of separating with the groove one-to-one in the outer screwed pipe, be provided with the activated sludge piece in the outer screwed pipe, set up the dismounting device who dismantles the installation to the outer screwed pipe in the compartment of the jar body, the horizontal part of L pipe runs through the jar body respectively and rotates the connection, the horizontal part of L pipe is connected with the screw rod respectively, the one end is rotated the connecting pipe is connected with the air outlet pipe is provided with the corresponding to the air inlet pipe, the air outlet pipe is provided with the angle intercommunication on the air outlet pipe, the air outlet pipe is provided with the corresponding to the top of the air inlet pipe, the air outlet pipe is connected with the corresponding to the air inlet pipe, the top of the aeration pipe, the aeration pipe is connected to the aeration pipe is connected.

Further, dismounting device constitute by three outer ring gear, three spring beam, three wedge, the pivot, two first gears, the second gear, five drive gears, have the first motor and the second motor of locking function, one of them outer ring gear rotates to be installed in the bottom of jar body, other two outer ring gear rotate to be installed in the top of jar body, the spring beam is fixed mounting respectively on outer ring gear, the wedge is fixed mounting respectively in the expansion end of corresponding spring beam, the wedge face of wedge all down, one side of jar body is provided with two first mounting panels about one, the pivot runs through two first mounting panels and rotates to be connected, two first gears are fixed mounting respectively in the pivot, the second gear passes through one-way bearing and installs in the pivot, the pivot passes through drive gear and the outer ring gear drive cooperation of the top, two first gears pass through drive gear and one of them first gear drive cooperation respectively, the second motor passes through drive gear and second gear drive cooperation.

Further, adjusting device constitute by several torsional spring, third gear, third motor, reciprocal lead screw, reciprocal screw, stop device and rack, the torsional spring sets up between the internal outer wall of L pipe and jar, the third gear is installed on L pipe through one-way bearing respectively, the periphery of jar body is provided with the second mounting panel, third motor fixed mounting is on the second mounting panel, the one end of the output shaft fixed connection reciprocal lead screw of third motor, reciprocal screw and reciprocal lead screw thread fit, stop device sets up on going up the multifilament female, reciprocal structure makes to the unable rotation of multifilament female only reciprocate, rack fixed mounting is on reciprocal screw, the third gear homoenergetic is with the rack meshing.

Further, the limiting device consists of a limiting ring and a limiting rod, wherein the periphery of the limiting ring is fixedly connected with the periphery of the multifilament master, one end of the limiting rod is fixedly connected with a second fixing plate, and the limiting rod penetrates through the limiting ring.

Furthermore, the aeration pipe is of an annular structure, and the air outlet valves are all arranged on the inner wall of the corresponding aeration pipe.

Further, the air outlet valve on the aerator pipe is arranged in a clockwise or anticlockwise direction.

Compared with the prior art, the invention has the beneficial effects that:

1. according to the sewage biochemical treatment device, sewage is added into the tank body through the liquid inlet pipe, when the sewage in the compartment is higher than the top of the L-shaped pipe, the sewage flows into the next compartment along the L-shaped pipe and the connecting pipe, the sewage can enter the outer spiral pipe along the permeable slot, microorganisms in the activated sludge block can decompose impurities, the treated partial impurities can be separated in the outer spiral pipe by the separation net and can be deposited in the outer spiral pipe, after the use is finished, the outer spiral pipe can be detached and replaced through the disassembling device, the inside of the outer spiral pipe is cleaned, the activated sludge block is replaced, in addition, gas can be introduced into each compartment through the air inlet pipe and the aeration pipe, and the sewage treatment speed of microorganisms in the activated sludge block is improved.

2. According to the sewage biochemical treatment device, an outer screw pipe to be installed is screwed into a lower-most screw rod from the bottom of a tank body, the lower-most wedge-shaped block can be clamped into a through groove on the outer screw pipe in the screwing process, a first motor is opened, the first motor can drive a rotating shaft to rotate forwards through a transmission gear and a first gear, and then the first gear and a second gear can be driven to rotate forwards, all the outer screw pipes can be driven to rotate forwards through an outer toothed ring, a spring rod and a wedge block and move upwards, the first motor is closed after the lower-most wedge-shaped block is separated from the through groove, at the moment, a second motor is opened, the second motor can drive the upper-most outer toothed ring to rotate forwards through the transmission gear and the second gear, under the action of a self-locking function of the first motor, the outer toothed ring at the upper-most can enable the wedge-most wedge-shaped block to be clamped into the through groove of the upper-most outer screw pipe, the upper-most outer screw pipe is driven to rotate forwards, and then the upper-most outer screw pipe can be driven to rotate forwards, and further the upper-most outer screw pipe can be enabled to be matched with the upper-most wedge-shaped block through the through groove, the upper-most wedge-shaped block can be conveniently separated from the bottom of the tank body through the external screw pipe through the device, and the upper-top of the tank can be conveniently detached from the external screw pipe through the device.

3. According to the sewage biochemical treatment device, the third motor is turned on, the output shaft of the third motor rotates to drive the reciprocating screw rod to rotate, under the influence of the limiting device, the reciprocating screw rod rotates to drive the multifilament nut to move up and down, the rack is driven to move up and down, when the rack moves up, the rack can sequentially contact with each third gear from top to bottom, and further sequentially drive each L-shaped pipe to rotate, sewage in each compartment of the tank body can sequentially flow downwards through the rotation of the L-shaped pipe, sewage in the bottommost layer of the tank body can be discharged through the structure, and sewage in each compartment of the tank body sequentially flows downwards, so that sewage is treated in batches.

4. According to the sewage biochemical treatment device, the limiting ring can slide up and down along the limiting rod, and further the reciprocating nut can be limited, so that the multifilament nut can only move up and down and cannot rotate along the central line of the multifilament nut.

5. According to the sewage biochemical treatment device, the aeration pipe can enclose the outer spiral pipe, so that microorganisms in the activated sludge blocks can obtain sufficient oxygen, and the sewage treatment speed of the microorganisms is improved.

6. According to the sewage biochemical treatment device, the air outlet valve is arranged in a mode that discharged air drives sewage to form a rotational flow, so that water flows, a stirring effect is achieved on the water flows, and the sewage treatment speed of microorganisms in the activated sludge blocks is further improved.

Drawings

Other features, objects and advantages of the present application will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the following drawings, in which:

FIG. 1 is a schematic diagram of the structure of the present invention;

fig. 2 is a partial view in the direction a of fig. 1.

In the figure: 1. a tank body; 2. a liquid inlet pipe; 3. a partition plate; 4. a screw hole; 5. an outer coil; 6. a screw; 7. a through groove; 8. a screen; 9. an activated sludge block; 10 An L-shaped pipe; 11. a connecting pipe; 12. an aeration pipe; 13. an air inlet pipe; 14. an outer toothed ring; 15. a spring rod; 16. wedge blocks; 17. a rotating shaft; 18. a first gear; 19. a second gear; 20. a transmission gear; 21. a first motor; 22. a second motor; 23. a first mounting plate; 24. a torsion spring; 25. a third gear; 26. a third motor; 27 reciprocating screw rods; 28 reciprocal nuts; 29. a rack; 30. a second mounting plate; 31. a limiting ring; 32. and a limit rod.

Detailed Description

The present application is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be noted that, for convenience of description, only the portions related to the invention are shown in the drawings.

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

As shown in figures 1 and 2, the sewage biochemical treatment device comprises a tank body 1, a supporting leg is arranged at the bottom of the tank body 1, a liquid inlet pipe 2 is arranged at the top of the tank body 1, a plurality of partition boards 3 are arranged in the tank body 1 to divide the tank body 1 into a plurality of compartments, screw holes 4 are respectively formed in the top surface and the bottom surface of the tank body 1 and by the partition boards 3, a plurality of sections of outer screw pipes 5 are also included, the outer screw threads of the outer screw pipes 5 are matched with the screw holes 4, the lower ends of the outer screw pipes 5 are sealed, screw rods 6 are respectively fixedly arranged at the outer ends of the outer screw pipes 5, internal screw threads are arranged at the upper parts of the inner walls of the outer screw pipes 5 and are matched with the screw rods 6, a plurality of vertical through grooves 7 are respectively formed in the periphery of the outer screw pipes 5, the top parts of the through grooves 7 are communicated with the outside, the bottoms of the through grooves 7 are in a wedge-shaped structure, the outer spiral pipe 5 is internally provided with a separation net 8 which corresponds to the permeation groove 7 one by one, the outer spiral pipe 5 is internally provided with an active sludge block 9, the tank body 1 is internally provided with a dismounting device for dismounting the outer spiral pipe 5, the compartment of the tank body 1 is internally provided with an L-shaped pipe 10 respectively, the horizontal parts of the L-shaped pipe 10 respectively penetrate through the tank body 1 and are rotationally connected, the horizontal ends of the L-shaped pipe 10 respectively rotate one ends of connecting pipes 11, the other ends of the connecting pipes 11 except the lowest connecting pipe 11 penetrate through the tank body 1 and are communicated with the tops of the corresponding compartments, the tank body 1 is provided with an adjusting device for adjusting the angle of the L-shaped rod 10, the compartments of the tank body 1 are internally provided with aeration pipes 12 respectively, the aeration pipes 12 are provided with air outlet holes and are provided with unidirectional air outlet valves, and the aeration pipes 12 are communicated with the air inlet pipes 13. Through the inlet tube 2 to adding sewage in the jar body 1, sewage enters into jar body 1 in the compartment, when the sewage in the compartment is higher than L pipe 10's top, can flow into next compartment along L pipe 10 and connecting pipe 11, sewage can be followed and in the outer solenoid 5 is gone into to the infiltration tank 7, microorganism can decompose the processing to impurity in the activated sludge blanket 9, the part impurity after the processing can be separated in outer solenoid 5 by net 8, and can deposit in outer solenoid 5, after using, can dismantle the change to outer solenoid 5 through dismounting device, and then clear up outside solenoid 5 is inside, and change activated sludge blanket 9, in addition, can pass through intake pipe 13 and aeration pipe 12 and pass through gas to each compartment in, improve the sewage treatment speed of microorganism in the activated sludge blanket 9, compare with current sewage treatment plant, this application can dismantle the installation to outer solenoid 5, thereby realize changing activated sludge blanket 9 and solenoid 5, and convenient to use, secondly, this jar body is with the outer solenoid 5 can dismantle the change to the outer solenoid 5, and the volume of going out of each compartment of pressure control is convenient to the L pipe is convenient for reduce in order to take out the volume of each compartment with the jar body 1.

As shown in fig. 1, it is further preferable that the dismounting device is composed of three outer toothed rings 14, three spring rods 15, three wedge blocks 16, a rotating shaft 17, two first gears 18, a second gear 19, five transmission gears 20, a first motor 21 with a locking function and a second motor 22, wherein one outer toothed ring 14 is rotatably mounted at the bottom of the tank 1, the other two outer toothed rings 14 are rotatably mounted at the top of the tank 1, the spring rods 15 are fixedly mounted on the outer toothed rings 14 respectively, the wedge blocks 16 are fixedly mounted at the movable ends of the corresponding spring rods 15 respectively, the wedge faces of the wedge blocks 16 face downwards, one side of the tank 1 is provided with an upper first mounting plate and a lower first mounting plate 23, the rotating shaft 17 penetrates through the two first mounting plates 23 and is rotatably connected, the two first gears 18 are fixedly mounted on the rotating shaft 17 respectively, the second gear 19 is mounted on the rotating shaft 17 through a one-way bearing, when the rotating shaft 17 rotates positively, the second gear 19 can be driven to rotate, the rotating shaft 17 is in transmission fit with the uppermost outer toothed ring 14 through the transmission gears 20, the two first gears 18 are respectively in transmission fit with the first motor 20 through the corresponding first gear 20 and one of the first gears 20 through the corresponding first gear 19. The outer screw tube 5 to be installed is screwed into the screw rod 6 at the lowest part from the bottom of the tank body 1, the process of screwing the outer screw tube 5 can lead the wedge block 16 at the lowest part to be clamped into the through groove 7 on the outer screw tube 5, the first motor 21 is opened, the first motor 21 can drive the rotating shaft 17 to rotate forwards through the transmission gear 20 and the first gear 18, then the first gear 18 and the second gear 19 can be driven to rotate forwards, then all the outer screw tubes 5 can be driven to rotate forwards and move upwards through the outer toothed ring 14, the spring rod 15 and the wedge block 16, after the wedge block 16 at the lowest part is separated from the through groove 7, the first motor 21 is closed, at the moment, the second motor 22 is opened, the second motor 22 can drive the outer toothed ring 14 at the highest part to rotate forwards through the transmission gear 20 and the second gear 19, under the effect of the self-locking function of the first motor 21, the outer toothed ring 14 except the uppermost outer toothed ring 14 cannot rotate, the uppermost outer toothed ring 14 rotates to enable the uppermost wedge-shaped block 16 to be clamped into the through groove 7 of the uppermost outer helical tube 5, the uppermost outer helical tube 5 is driven to rotate forwards, the screw rod 6 on the uppermost outer helical tube 5 is further enabled to be separated from the outer helical tube 5 in threaded fit below the uppermost outer helical tube 5, the outer helical tube 5 can be removed through the existing lifting clamping equipment (such as a mechanical arm), the dismounting device is matched with the structure of the tank, the wedge-shaped block 16 positioned below the top of the tank 1 can fix the second outer helical tube 5 from top to bottom, so that the uppermost outer helical tube 5 is separated from the wedge-shaped block 16 is enabled to be convenient for the wedge-shaped block 16 to separate from the through groove 7 downwards, and after the installation of the wedge-shaped structure at the bottom of the through groove 7 is completed, the sewage can be well prevented from flowing out from the permeable tank 7.

As shown in fig. 1, further preferably, the adjusting device is composed of a plurality of torsion springs 24, a third gear 25, a third motor 26, a reciprocating screw 27, a reciprocating screw 28, a limiting device and a rack 29, wherein the torsion springs 24 are arranged between the L-shaped tube 10 and the outer wall in the tank 1, the torsion springs 24 can enable the vertical portion of the L-shaped tube 10 to be in a vertical state, the third gear 25 is respectively installed on the L-shaped tube 10 through a one-way bearing, a second installation plate 30 is arranged at the periphery of the tank 1, the third motor 26 is fixedly installed on the second installation plate 30, an output shaft of the third motor 26 is fixedly connected with one end of the reciprocating screw 27, the reciprocating screw 28 is in threaded fit with the reciprocating screw 27, the limiting device is arranged on the multi-filament screw 28, the reciprocating structure enables the reciprocating screw 28 to be unable to rotate and only move up and down, the rack 29 is fixedly installed on the reciprocating screw 28, the third gear 25 can be meshed with the rack 29, the length of the rack 29 is one fourth of the circumference of the third gear 25, the rack 29 drives the rotation angle of the third gear 25 to be 90 °, and the third gear 25 can be driven to rotate by the third gear 25 upwards through the one-way bearing 29 when moving upwards. The third motor 26 is opened, the output shaft of the third motor 26 rotates to drive the reciprocating screw rod 27 to rotate, the influence of the limiting device, the reciprocating screw rod 27 rotates to drive the multifilament mother 28 to move up and down, then the rack 29 is driven to move up and down, when the rack 29 moves up, the rack 29 can sequentially contact with each third gear 25 from top to bottom, and then sequentially drive each L-shaped pipe 10 to rotate, the L-shaped pipe 10 rotates to sequentially flow down sewage in each compartment of the tank body 1, the structure can enable sewage in the bottommost layer to be discharged, and sewage in each compartment in the tank body 1 sequentially flows down, so that batch treatment is carried out on the sewage.

As shown in fig. 1, it is further preferable that the limiting device comprises a limiting ring 31 and a limiting rod 32, wherein the periphery of the limiting ring 31 is fixedly connected with the periphery of the reciprocating nut 28, one end of the limiting rod 32 is fixedly connected with the second fixing plate 30, and the limiting rod 32 passes through the limiting ring 31. The stop collar 31 can slide up and down along the stop lever 32, and then can limit the reciprocating nut 28, so that the multifilament nut 28 can only move up and down and can not rotate along the center line of the stop collar, and the stop device is simple in structure and convenient to produce and manufacture.

As shown in fig. 1 and 2, it is further preferable that the aeration tubes 12 have a ring structure, and the air outlet valves are disposed on the inner walls of the corresponding aeration tubes 12. The aeration pipe 12 can enclose the outer spiral pipe 5, so that microorganisms in the activated sludge block 9 can obtain sufficient oxygen, and the sewage treatment speed of the microorganisms is improved.

As shown in fig. 1 and 2, it is further preferable that the air outlet valve on the aeration tube 12 is disposed in a clockwise or counterclockwise direction. The arrangement mode of the air outlet valve can enable the discharged air to drive sewage to form rotational flow, so that water flow flows, the stirring effect is achieved on the water flow, and the sewage treatment speed of microorganisms in the activated sludge block 9 is further improved.

The foregoing description is only of the preferred embodiments of the present application and is presented as a description of the principles of the technology being utilized. It will be appreciated by persons skilled in the art that the scope of the invention referred to in this application is not limited to the specific combinations of features described above, but it is intended to cover other embodiments in which any combination of features described above or equivalents thereof is possible without departing from the spirit of the invention. Such as the above-described features and technical features having similar functions (but not limited to) disclosed in the present application are replaced with each other.

Other technical features besides those described in the specification are known to those skilled in the art, and are not described herein in detail to highlight the innovative features of the present invention.

Claims

1. The utility model provides a sewage biochemical treatment device, including a jar body (1), the bottom of jar body (1) is provided with the supporting leg, the top of jar body (1) is provided with feed liquor pipe (2), the interior of jar body (1) is provided with several baffle (3) and divide into several compartment with jar body (1), characterized by, screw (4) have all been seted up with the top surface and the bottom surface of jar body (1) baffle (3), still including several sections outer screwed pipe (5), the external screw thread and screw (4) screw thread fit of outer screwed pipe (5), the lower extreme of outer screwed pipe (5) is all sealed, the outer end of outer screwed pipe (5) is fixed mounting respectively has screw rod (6), the inner wall upper portion of outer screwed pipe (5) is provided with the internal thread and screw rod (6) screw fit, the periphery of outer screwed pipe (5) has seted up several vertical through groove (7) respectively, the top and the external intercommunication of through groove (7), the bottom of through groove (5) is wedge structure, be provided with in outer screwed pipe (5) with the one-to-one and-to-one correspondence in the outer screwed pipe (7) and separate the piece (8), the inner side of outer screwed pipe (5) is provided with one-to dismantle the inner side of outer screwed pipe (5) and one side of the inner pipe (5) is provided with the inner wall of outer screwed pipe (5) is provided with one-to be connected with the inner pipe (1) of a segment (1), the sewage pipe (1) is connected with a sewage pipe (1) respectively, the sewage treatment device is connected with sewage tank (1), the horizontal end of L pipe (10) rotates the one end of connecting pipe (11) respectively, except that the other end of connecting pipe (11) outside below connecting pipe (11) runs through jar body (1) and communicates with corresponding compartment top, be provided with the adjusting device who adjusts L shape pole (10) angle on jar body (1), be provided with aeration pipe (12) in the compartment of jar body (1) respectively, be provided with the venthole on aeration pipe (12) and be provided with unidirectional valve of giving vent to anger, aeration pipe (12) all communicate with intake pipe (13).

2. The biochemical sewage treatment device according to claim 1, wherein the disassembling device comprises three outer tooth rings (14), three spring rods (15), three wedge blocks (16), a rotating shaft (17), two first gears (18), a second gear (19), five transmission gears (20), a first motor (21) with a locking function and a second motor (22), wherein one outer tooth ring (14) is rotatably mounted at the bottom of the tank body (1), the other two outer tooth rings (14) are rotatably mounted at the top of the tank body (1), the spring rods (15) are fixedly mounted on the outer tooth rings (14) respectively, the wedge blocks (16) are fixedly mounted at the movable ends of the corresponding spring rods (15) respectively, the wedge faces of the wedge blocks (16) are downward, one side of the tank body (1) is provided with an upper first mounting plate and a lower first mounting plate (23), the rotating shaft (17) penetrates through the two first mounting plates (23) and is rotatably connected, the two first gears (18) are fixedly mounted on the top of the tank body (17) respectively, the second gears (19) are mounted on the top of the tank body (17) through bearings (17) and are correspondingly matched with the two outer tooth rings (14) through the bearings (20) respectively, the first motor (21) is in transmission fit with one of the first gears (18) through a transmission gear (20), and the second motor (22) is in transmission fit with the second gear (19) through the transmission gear (20).

3. The biochemical sewage treatment device according to claim 1, wherein the adjusting device is composed of a plurality of torsion springs (24), a third gear (25), a third motor (26), a reciprocating screw (27), a reciprocating screw (28), a limiting device and a rack (29), the torsion springs (24) are arranged between the L-shaped pipe (10) and the outer wall in the tank body (1), the third gear (25) is respectively arranged on the L-shaped pipe (10) through a one-way bearing, the second mounting plate (30) is arranged on the periphery of the tank body (1), the third motor (26) is fixedly arranged on the second mounting plate (30), an output shaft of the third motor (26) is fixedly connected with one end of the reciprocating screw (27), the reciprocating screw (28) is in threaded fit with the reciprocating screw (27), the limiting device is arranged on the reciprocating screw (28), the reciprocating structure enables the reciprocating screw (28) to be incapable of rotating and only up and down, the rack (29) is fixedly arranged on the reciprocating screw (28), and the third gear (25) can be meshed with the rack (29).

4. A sewage biochemical treatment device according to claim 3, wherein the limiting device comprises a limiting ring (31) and a limiting rod (32), the periphery of the limiting ring (31) is fixedly connected with the periphery of the multifilament female yarn (28), one end of the limiting rod (32) is fixedly connected with the second fixing plate (30), and the limiting rod (32) penetrates through the limiting ring (31).

5. The biochemical sewage treatment device according to claim 1, wherein the aeration pipes (12) are of annular structures, and the air outlet valves are arranged on the inner walls of the corresponding aeration pipes (12).

6. The biochemical treatment device for sewage according to claim 5, wherein the air outlet valve on the aeration pipe (12) is arranged in a clockwise or anticlockwise direction.