CN118637729A - A multi-circulation sewage treatment equipment - Google Patents

Abstract

The present invention relates to the field of sewage treatment, specifically a multiple circulation type sewage treatment equipment. It includes a frame, a pumping mechanism, a circulation filtering mechanism and a flocculant adding mechanism; the pumping mechanism is arranged on the frame; the circulation filtering mechanism includes a circulation pipe connected to the pumping mechanism and arranged on the frame, multiple groups of filter components horizontally arranged side by side, and a driving mechanism for driving the filter components to rotate to flip the trapped dirt downward, the circulation pipe includes a spiral pipe portion spirally distributed in the horizontal direction and multiple connecting pipe portions connected to the bottom end of the spiral pipe portion, the bottom end of the connecting pipe portion has a sewage discharge channel, the connecting pipe portion corresponds to the filter component one by one, and the filter component includes four filter plates distributed in a circular array; the flocculant adding mechanism is arranged on the frame and connected to the top of the spiral pipe portion. The present invention can conveniently clean the dirt on the filter plate to ensure the filtering performance of the filter plate.

Description

A multi-circulation sewage treatment equipment

Technical Field

The invention relates to the field of sewage treatment, and in particular to a multi-circulation sewage treatment device.

Background Art

Wastewater treatment is the process of purifying wastewater to meet the water quality requirements for discharge into a water body or reuse. Wastewater treatment is widely used in various fields such as construction, environmental protection, urban landscape, agriculture, transportation, energy, medical treatment, and catering.

Chinese patent announcement number CN217265125U discloses a circulating sewage treatment device for environmental engineering. Sewage is injected into a sedimentation tank from a sewage inlet pipe. Silt and impurities in the sewage will settle due to density. Then, a first water pump cooperates with a first delivery pipe to input sewage from the upper end of the sedimentation tank into a storage tank. The sewage is then delivered to a treatment tank through a second water pump and a second delivery pipe. The sewage is purified by a filter membrane and can be returned to the storage tank through a return pipe by opening a one-way valve for repeated filtration.

However, the above technical solution has the following shortcomings:

After the filter membrane filters sewage, the dirt remaining on the filter membrane gradually increases, causing the filtering performance of the filter membrane to gradually decrease, and the dirt on the filter membrane is not easy to clean.

Summary of the invention

The purpose of the present invention is to solve the problems existing in the background technology and to provide a multi-circulation sewage treatment device which can conveniently clean the dirt on the filter plate to ensure the filtering performance of the filter plate.

The technical solution of the present invention is a multiple circulation type sewage treatment equipment, comprising a frame, a pumping mechanism, a circulation filtering mechanism and a flocculant adding mechanism; the pumping mechanism is arranged on the frame; the circulation filtering mechanism comprises a circulation pipe connected to the pumping mechanism and arranged on the frame, a plurality of groups of filter components horizontally arranged side by side and a driving mechanism for driving the filter components to rotate so as to flip the retained dirt downward, the circulation pipe comprises a spiral pipe portion spirally distributed along the horizontal direction and a plurality of connecting pipe portions connected to the bottom end of the spiral pipe portion, the bottom end of the connecting pipe portion has a sewage discharge channel, the connecting pipe portion corresponds one-to-one with the filter component, and the filter component comprises four filter plates distributed in a circular array; the flocculant adding mechanism is arranged on the frame and connected to the top end of the spiral pipe portion.

Preferably, the pumping mechanism comprises a sewage pump arranged on the frame, a pumping pipe connected to the input end of the sewage pump, and a water inlet pipe connected between the output end of the sewage pump and the input end of the circulating pipe.

Preferably, the inner wall of the spiral tube portion is provided with a plurality of guide strips distributed along the direction of the spiral tube portion, and the width of the guide strips gradually decreases in a direction away from the inner wall of the spiral tube portion.

Preferably, the driving mechanism includes a rotating shaft a which is rotatably sealed and arranged on a plurality of connecting pipe parts, and a motor which is arranged on the connecting pipe parts and drivingly connected to the rotating shaft a. In each group of filter components, four filter plates are evenly distributed around the rotating shaft a, and the filter plates are radially connected to the outer peripheral surface of the rotating shaft a.

Preferably, the bottom end of the sewage discharge channel of the connecting pipe portion is connected with valve a, the bottom end of valve a is connected with a sewage collecting pipe, the bottom end of the sewage collecting pipe is connected with valve b, and the bottom end of valve b is connected with a sewage discharge pipe.

Preferably, the flocculant adding mechanism includes a cylinder rack arranged on the top of the frame, a rotating cylinder arranged on the cylinder rack, a piston slidably arranged in the rotating cylinder and dividing the internal space of the rotating cylinder into a liquid chamber and an air chamber, a transmission assembly connected to the piston, an inlet pipe and an infusion pipe connected to the liquid chamber, a one-way valve c arranged on the inlet pipe, a plurality of discharge pipes connected between the top end of the spiral tube part and the infusion pipe, and a one-way valve d arranged on the discharge pipe, the inlet pipe is connected to a liquid storage barrel, the one-way valve c unidirectionally conducts the flocculant in the liquid storage barrel into the liquid chamber, and the one-way valve d unidirectionally conducts the flocculant in the infusion pipe into the spiral tube part.

Preferably, the diameters of the plurality of drainage pipes gradually decrease along the sewage flow direction.

Preferably, the air cavity is connected with an air inlet pipe and an air delivery pipe, and a one-way valve a is provided on the air inlet pipe to conduct external air into the air cavity in a one-way manner. A plurality of exhaust pipes are connected between the air delivery pipe and the top of the spiral tube portion, and the connection point between the exhaust pipe and the spiral tube portion is located on the rear side of the connection point between the drain pipe and the spiral tube portion. A one-way valve b is provided on the exhaust pipe to conduct air from the air delivery pipe to the spiral tube portion in a one-way manner.

Preferably, the transmission assembly includes a venturi tube having one end connected to the output end of the circulating flow tube, a reduction tube having one end connected to the other end of the venturi tube, a drain pipe having one end connected to the other end of the reduction tube, a rotating shaft b and a rotating shaft c rotatably arranged on the reduction tube, a plurality of blades evenly arranged on the circumferential surface of the rotating shaft b, a gear a coaxially arranged on the rotating shaft b, a gear b coaxially arranged on the rotating shaft c and meshingly connected to the gear a, a turntable coaxially arranged on the rotating shaft c, a connecting frame eccentrically connected to the turntable, and a sliding rod having two ends respectively connected to the connecting frame and the piston for rotation, the sliding rod being slidably arranged on the middle rotating cylinder, and the gear a being larger than the gear b.

Compared with the prior art, the present invention has the following beneficial technical effects:

The present invention can conveniently clean the dirt on the filter plate to ensure the filtering performance of the filter plate. The dirt can be turned off by rotating the filter assembly, and the dirt on the filter plate can be removed without taking out the filter plate, which is convenient for cleaning. The sewage can be filtered through multiple groups of filter assemblies to obtain multiple filtering treatments, and the filtering effect is good.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic structural diagram of an embodiment of the present invention;

FIG2 is a partial structural cross-sectional view of an embodiment of the present invention;

FIG3 is an enlarged view of the structure at A in FIG2;

FIG4 is an enlarged view of the structure at B in FIG2;

FIG5 is an exploded view of the structure of the circulation pipe, the guide strip, the venturi pipe, the speed reduction pipe and the drainage pipe;

FIG. 6 is a schematic diagram of a partial structure of a guide strip.

Figure numerals: 1, frame; 2, water pump; 3, sewage pump; 4, water inlet pipe; 5, circulation pipe; 51, spiral pipe; 52, connecting pipe; 6, venturi tube; 7, deceleration pipe; 8, drainage pipe; 9, guide strip; 10, shaft a; 11, filter plate; 12, motor; 13, valve a; 14, sewage collection pipe; 15, valve b; 16, sewage pipe; 17, shaft b; 18, blade; 1 9. Gear a; 20. Gear b; 21. Rotating shaft c; 22. Turntable; 23. Connecting frame; 24. Sliding rod; 25. Piston; 26. Transfer cylinder; 261. Cylinder rack; 27. Air inlet pipe; 271. Check valve a; 28. Air supply pipe; 29. Exhaust pipe; 291. Check valve b; 30. Liquid inlet pipe; 301. Check valve c; 31. Liquid supply pipe; 32. Liquid discharge pipe; 321. Check valve d.

DETAILED DESCRIPTION

Embodiment 1, as shown in FIG. 1 to FIG. 6 , this embodiment proposes a multiple circulation type sewage treatment equipment, including a frame 1, a pumping mechanism, a circulation filtering mechanism and a flocculant adding mechanism.

The pumping mechanism includes a sewage pump 3 arranged on a frame 1, a pumping pipe 2 connected to the input end of the sewage pump 3, and a water inlet pipe 4 connected to the output end of the sewage pump 3. The pumping pipe 2 is connected to the sewage source, and the sewage is pumped out by the sewage pump 3 and transported to the water inlet pipe 4. The water inlet pipe 4 is connected to the input end of the circulation filtering mechanism, and the sewage is transported to the circulation filtering mechanism for multiple circulation filtration.

The circulation filtering mechanism includes a circulation pipe 5 connected to the pumping mechanism and arranged on the frame 1, a plurality of filter components horizontally arranged side by side, and a driving mechanism for driving the filter components to rotate so as to flip the trapped dirt downward. The circulation pipe 5 includes a spiral pipe portion 51 spirally distributed in the horizontal direction and a plurality of connecting pipe portions 52 connected to the bottom end of the spiral pipe portion 51. The input end of the circulation pipe 5 is connected to the water inlet pipe 4 to receive the sewage transported by the water inlet pipe 4, and the sewage can flow in a spiral direction along the circulation pipe 5. The bottom end of the connecting pipe portion 52 has a sewage discharge channel, and the connecting pipe portion 52 corresponds to the filter component one by one. The filter component includes four filter plates 11 distributed in a circular array. The filter plate 11 is a rectangular plate-shaped structure. The connecting pipe portion 52 has a horizontally distributed rectangular channel for the filter plate 11 to move, and the sewage discharge channel is connected to the bottom end of the rectangular channel. The filter assembly is distributed inside the connecting pipe portion 52 and is located at the bottom of the entire circulating pipe 5, so it can more effectively intercept the dirt that is transported along the spiral shape from a higher position with the sewage, and the filtering effect is good.

The flocculant adding mechanism is arranged on the frame 1 and communicated with the top end of the spiral tube portion 51 , and can add flocculant into the spiral tube portion 51 . The sewage is mixed with the flocculant, and the generated flocculated precipitated dirt is retained by the filter plate 11 .

When the filter plates 11 are used to filter the dirt, two of the four filter plates 11 are horizontally distributed and block the top of the drainage channel, the upper filter plate 11 vertically blocks the rectangular channel, and the lower filter plate 11 is vertically located in the drainage channel. The dirt is intercepted by the filter plates 11 on the side of the sewage and the upper filter plate 11.

As shown in Figures 2 and 3, when cleaning the dirt on the filter plate 11, the filter plate 11 is driven by the driving mechanism to rotate counterclockwise by 90 degrees, and the filter plate 11 on the side of the original sewage and the filter plate 11 above flip the dirt into the sewage channel, which is convenient for cleaning. The filter plate 11 originally on the upper side rotates to the side of the sewage, the filter plate 11 on the side of the original sewage rotates to the bottom, the filter plate 11 originally on the bottom side rotates to the side of the sewage, and the filter plate 11 on the side of the original sewage rotates to the top, and finally the filter plate 11 rotated to the side of the sewage and the filter plate 11 rotated to the top can work together to intercept the dirt.

As shown in Fig. 5 and Fig. 6, the inner wall of the spiral tube portion 51 is provided with a plurality of guide strips 9 distributed along the direction of the spiral tube portion 51, and the width of the guide strips 9 gradually decreases in the direction away from the inner wall of the spiral tube portion 51. When the sewage and the flocculant flow in the spiral tube portion 51, they can further flow along the spiral shape through the guiding effect of the guide strips 9, so that the sewage and the flocculant are mixed more fully, and the flocculant has a better flocculation effect on the impurities in the sewage.

The driving mechanism includes a rotating shaft a10 which is rotatably sealed and arranged on a plurality of connecting pipes 52, and a motor 12 which is arranged on the connecting pipes 52 and is drivingly connected to the rotating shaft a10. In each filter assembly, four filter plates 11 are evenly distributed around the rotating shaft a10, and the filter plates 11 are radially connected to the outer peripheral surface of the rotating shaft a10. The motor 12 can drive the rotating shaft a10 to rotate, and the rotating shaft a10 drives the filter plates 11 to rotate synchronously.

This embodiment can conveniently clean the dirt on the filter plate 11 to ensure the filtering performance of the filter plate 11. The filter plate 11 is always located in the device, and the dirt on the filter plate 11 can be removed without taking out the filter plate 11, which is convenient to clean and ensures the filtering effect of the filter plate 11 on the dirt in the sewage. The sewage can be filtered through multiple groups of filtering components, and the filtering effect is good.

Embodiment 2, as shown in Figures 1-3, this embodiment proposes a multiple circulation sewage treatment equipment. Compared with Embodiment 1, in this embodiment, the bottom end of the sewage discharge channel of the connecting pipe part 52 is connected to a valve a13, the bottom end of the valve a13 is connected to a sewage collecting pipe 14, the bottom end of the sewage collecting pipe 14 is connected to a valve b15, and the bottom end of the valve b15 is connected to a sewage discharge pipe 16.

When using the filter plate 11 to filter the dirt, open valve a13 and close valve b15. When cleaning the dirt on the filter plate 11, the original sewage will fall into the sewage discharge channel after the filter plate 11 on one side and the filter plate 11 above, and the flowing sewage can wash away the dirt on the two filter plates 11, and the dirt will fall down into the sewage collection pipe 14 for centralized collection. When it is necessary to discharge the dirt in the sewage collection pipe 14, close valve a13, open valve b15, and discharge the dirt from the sewage discharge pipe 16. The process of discharging the dirt does not affect the normal sewage treatment process, and the sewage can be continuously filtered through the circulation filtration mechanism, thereby ensuring the sewage treatment efficiency. In addition, as the sewage gradually undergoes multiple filtrations, the dirt intercepted by the multiple groups of filter components becomes less and less, and the amount of dirt collected in the multiple sewage collection pipes 14 decreases successively. Therefore, the closer the sewage collection pipe 14 is to the front, the higher the frequency of its need to discharge the dirt.

Embodiment 3, as shown in Figures 1 to 5, this embodiment proposes a multi-circulation sewage treatment equipment. Compared with Embodiment 1, in this embodiment, the flocculant adding mechanism includes a cylinder frame 261 arranged on the top of the frame 1, a rotating cylinder 26 arranged on the cylinder frame 261, a piston 25 slidably arranged in the rotating cylinder 26 and dividing the internal space of the rotating cylinder 26 into a liquid cavity and an air cavity, a transmission assembly connected to the piston 25, a liquid inlet pipe 30 and a liquid delivery pipe 31 connected to the liquid cavity, a one-way valve c301 arranged on the liquid inlet pipe 30, a plurality of liquid discharge pipes 32 connected between the top of the spiral tube part 51 and the liquid delivery pipe 31, and a one-way valve d321 arranged on the liquid discharge pipe 32. The spatial dimensions of the liquid cavity and the air cavity change dynamically with the movement of the piston 25, but the total spatial dimensions of the liquid cavity and the air cavity remain unchanged. The liquid inlet pipe 30 is connected to a liquid storage barrel, and the one-way valve c301 conducts the flocculant in the liquid storage barrel to the liquid cavity in a one-way manner. When the flocculant in the liquid storage barrel is almost used up, the flocculant is directly added to the liquid storage barrel. The liquid inlet pipe 30 and the liquid storage barrel can be connected by a hose, and the liquid storage barrel can be placed on the side of the frame 1. The one-way valve d321 conducts the flocculant in the liquid delivery pipe 31 to the spiral tube part 51 in a one-way manner.

The diameters of the multiple drainage pipes 32 gradually decrease along the sewage flow direction. The smaller the diameter of the drainage pipe 32, the smaller the amount of flocculant output. As the sewage gradually undergoes multiple filtrations, the sewage becomes cleaner as time goes by. Therefore, only less flocculant needs to be delivered in the future to ensure the flocculation effect, reducing costs.

The air cavity is connected with an air inlet pipe 27 and an air supply pipe 28. A one-way valve a271 is provided on the air inlet pipe 27 to conduct external air into the air cavity in a one-way manner. A plurality of exhaust pipes 29 are connected between the air supply pipe 28 and the top of the spiral tube portion 51. The connection between the exhaust pipe 29 and the spiral tube portion 51 is located on the rear side of the connection between the drain pipe 32 and the spiral tube portion 51, that is, when sewage circulates, it first passes through the connection between the drain pipe 32 and the spiral tube portion 51, and then passes through the connection between the exhaust pipe 29 and the spiral tube portion 51. A one-way valve b291 is provided on the exhaust pipe 29 to conduct air from the air supply pipe 28 to the spiral tube portion 51 in a one-way manner.

When the piston 25 moves away from the air inlet pipe 27, negative pressure is generated in the air cavity, the one-way valve a271 opens, the one-way valve b291 closes, and the external air enters the air cavity through the air inlet pipe 27. When the piston 25 moves toward the air inlet pipe 27, the one-way valve a271 closes, the one-way valve b291 opens, and the piston 25 delivers the air to the spiral tube part 51 through the air supply pipe 28 and the exhaust pipe 29. On the one hand, the air can be aerated and purified by the sewage after entering the spiral tube part 51. On the other hand, the air can accelerate the mixing of the sewage and the flocculant by rushing into the sewage, thereby improving the flocculation effect. In addition, the air can be divided into smaller bubbles by the guide strip 9, so that it can be in more complete contact with the sewage, and the aeration and purification effect is better.

When external air enters the air cavity through the air inlet pipe 27, the flocculant in the liquid cavity is transported to the spiral tube portion 51 through the liquid delivery pipe 31 and the liquid discharge pipe 32. When the flocculant enters the liquid cavity from the liquid inlet pipe 30, the air in the air cavity is transported to the spiral tube portion 51 through the air delivery pipe 28 and the exhaust pipe 29.

Embodiment 4, as shown in Figures 1 to 5, this embodiment proposes a multiple circulation type sewage treatment equipment. Compared with Embodiment 3, in this embodiment, the transmission assembly includes a venturi tube 6 connected to the output end of the circulation tube 5 at one end, a speed reducer tube 7 connected to the other end of the venturi tube 6 at one end, a drain pipe 8 connected to the other end of the speed reducer tube 7 at one end, a rotating shaft b17 and a rotating shaft c21 rotatably arranged on the speed reducer tube 7, a plurality of blades 18 evenly arranged on the circumferential surface of the rotating shaft b17, a gear a19 coaxially arranged on the rotating shaft b17, a gear b20 coaxially arranged on the rotating shaft c21 and meshingly connected to the gear a19, a turntable 22 coaxially arranged on the rotating shaft c21, a connecting frame 23 eccentrically connected to the turntable 22, and a sliding rod 24 rotatably connected to the connecting frame 23 and the piston 25 at both ends, the sliding rod 24 is slidably arranged on the middle rotating cylinder 26, and the sliding rod 24 and the middle rotating cylinder 26 are sealed to prevent air leakage at the connection. Gear a19 is larger than gear b20, and can make the turntable 22 rotate at a speed greater than the rotation shaft b17. The speed reducer 7 includes a rectangular tube portion and an arc-shaped tube portion connected to the top of the rectangular tube portion. When the blade 18 is inside the rectangular tube portion, it can be flushed open by the water flow and rotate into the arc-shaped tube portion. As the water flow continues to flow, the blade 18 can continue to rotate, and the impact force of the water flow is used to achieve the reciprocating movement of the piston 25. After the water hits the blade 18, the flow rate slows down and is discharged through the drain pipe 8.

In this embodiment, the treated sewage flows from the outer end of the circulation pipe 5 to the venturi tube 6, the water flow velocity increases, and the blade 18 in the speed reduction tube 7 is flushed open, the blade 18 drives the rotating shaft b17 to rotate, the rotating shaft b17 drives the gear a19 to rotate, the gear a19 drives the gear b20 to rotate, the gear b20 drives the turntable 22 to rotate through the rotating shaft c21, the turntable 22 drives the connecting frame 23 to move, the connecting frame 23 drives the slide rod 24 to move back and forth, and the slide rod 24 drives the piston 25 to move back and forth.

The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto, and various changes can be made within the knowledge scope of technicians in the relevant technical field without departing from the purpose of the present invention.

Claims (9)

1. A multiple loop type sewage treatment apparatus, comprising:

a frame (1);

The water pumping mechanism is arranged on the frame (1);

The circulating filter mechanism comprises a circulating pipe (5) which is communicated with the water pumping mechanism and is arranged on the frame (1), a plurality of groups of filter components which are horizontally distributed side by side and a driving mechanism for driving the filter components to rotate so as to downwards turn down trapped dirt, wherein the circulating pipe (5) comprises a spiral pipe part (51) which is spirally distributed along the horizontal direction and a plurality of connecting pipe parts (52) which are communicated with the bottom end of the spiral pipe part (51), the bottom end of each connecting pipe part (52) is provided with a sewage drainage channel, the connecting pipe parts (52) are in one-to-one correspondence with the filter components, and the filter components comprise four filter plates (11) which are distributed in a circular array;

And the flocculating agent adding mechanism is arranged on the machine frame (1) and is communicated with the top end of the spiral pipe part (51).

2. A multiple circulation sewage treatment plant according to claim 1, characterised in that the pumping means comprise a sewage pump (3) arranged on the frame (1), a pumping pipe (2) communicating with the input of the sewage pump (3) and a water inlet pipe (4) communicating between the output of the sewage pump (3) and the input of the circulation pipe (5).

3. A multiple circulation sewage treatment plant according to claim 1, wherein the inner wall of the spiral pipe section (51) is provided with a plurality of guide strips (9) distributed along the trend of the spiral pipe section (51), the guide strips (9) decreasing in width in a direction away from the inner wall of the spiral pipe section (51).

4. A multiple circulation sewage treatment device according to claim 1, wherein the driving mechanism comprises a rotary shaft a (10) rotatably and sealingly arranged on a plurality of joint pipe portions (52) and a motor (12) arranged on the joint pipe portions (52) and drivingly connected with the rotary shaft a (10), four filter plates (11) in each group of filter assemblies are uniformly distributed around the rotary shaft a (10), and the filter plates (11) are radially connected on the outer peripheral surface of the rotary shaft a (10) along the rotary shaft a (10).

5. The multiple circulation sewage treatment device according to claim 4, wherein the bottom end of the sewage channel of the connecting pipe portion (52) is communicated with a valve a (13), the bottom end of the valve a (13) is communicated with a sewage collecting pipe (14), the bottom end of the sewage collecting pipe (14) is communicated with a valve b (15), and the bottom end of the valve b (15) is communicated with a sewage discharging pipe (16).

6. The multiple circulation sewage treatment device according to claim 1, wherein the flocculant adding mechanism comprises a barrel frame (261) arranged at the top of the frame (1), a transfer barrel (26) arranged on the barrel frame (261), a piston (25) which is arranged in the transfer barrel (26) in a sliding manner and divides the inner space of the transfer barrel (26) into a liquid cavity and an air cavity, a transmission assembly which is in transmission connection with the piston (25), a liquid inlet pipe (30) and a liquid delivery pipe (31) which are communicated with the liquid cavity, a one-way valve c (301) arranged on the liquid inlet pipe (30), a plurality of liquid discharge pipes (32) which are communicated between the top end of the spiral pipe part (51) and the liquid delivery pipe (31) and one-way valves d (321) arranged on the liquid discharge pipe (32), wherein the liquid inlet pipe (30) is communicated with a liquid storage barrel, the one-way valve c (301) is communicated with the flocculant in the liquid storage barrel into the liquid cavity, and the one-way valve d (321) is communicated with the flocculant in the liquid delivery pipe (31) into the part (51).

7. A multiple circulation sewage treatment apparatus according to claim 6, wherein the diameters of the plurality of liquid discharge pipes (32) gradually decrease in the sewage circulation direction.

8. The multiple circulation sewage treatment device according to claim 6, wherein the air chamber is communicated with an air inlet pipe (27) and an air delivery pipe (28), a check valve a (271) for conducting outside air into the air chamber in a one-way is arranged on the air inlet pipe (27), a plurality of exhaust pipes (29) are communicated between the air delivery pipe (28) and the top of the spiral pipe part (51), the communicating position of the exhaust pipes (29) and the spiral pipe part (51) is positioned at the rear side of the communicating position of the liquid discharge pipe (32) and the spiral pipe part (51), and a check valve b (291) for conducting air into the spiral pipe part (51) from the air delivery pipe (28) is arranged on the exhaust pipe (29).

9. A multiple circulation sewage treatment device according to claim 8, wherein the transmission assembly comprises a venturi tube (6) having one end communicated with the output end of the circulation tube (5), a speed reducing tube (7) having one end communicated with the other end of the venturi tube (6), a drain tube (8) having one end communicated with the other end of the speed reducing tube (7), a rotating shaft b (17) and a rotating shaft c (21) rotatably provided on the speed reducing tube (7), a plurality of blades (18) uniformly provided on the circumferential surface of the rotating shaft b (17), a gear a (19) coaxially provided on the rotating shaft b (17), a gear b (20) coaxially provided on the rotating shaft c (21) and engaged with the gear a (19), a turntable (22) coaxially provided on the rotating shaft c (21), a connecting frame (23) eccentrically rotatably connected with the turntable (22), and a slide bar (24) having both ends rotatably connected with the connecting frame (23) and the piston (25), the slide bar (24) being slidably provided on the middle drum (26), and the gear a (19) being larger than the gear b (20).