CN220413137U - Air floatation sludge concentration device - Google Patents

Abstract

The utility model provides a sludge concentrating device by an air floatation method, which comprises the following steps: the device comprises a shell, a stirring assembly and a mud scraping assembly. The shell comprises a discharging section, an aeration section and a feeding section which are spliced in sequence from top to bottom, and a discharging box is arranged on the side wall of the discharging section. The inner side wall of the aeration section is provided with a plurality of mounting cuts, each mounting cut is provided with a detachably connected guide cover, a guide channel is formed between two adjacent guide covers, and the side wall of the guide cover, which is close to the guide channel, is provided with a plurality of aeration holes. The stirring assembly comprises a driving motor and a stirring shaft, an output shaft of the driving motor is connected with the stirring shaft, and a spiral auger blade is arranged on the side wall of the stirring shaft. The mud scraping assembly comprises a bearing disc and a mud scraping strip, the bearing disc is rotatably sleeved on the stirring shaft, and the mud scraping strip is arranged on the bottom surface of the bearing disc. The air-float sludge concentration device can improve the efficiency of air-float sludge concentration and reduce the difficulty of cleaning and maintaining equipment.

Description

Air floatation sludge concentration device

Technical Field

The utility model belongs to the field of sludge treatment equipment, and particularly relates to a sludge concentrating device by an air floatation method.

Background

Sludge is a precipitate generated in the sewage treatment process, and the higher the water content of the sludge is, the larger the volume of the sludge is, so that in order to reduce the difficulty of transporting and treating the sludge, workers need to concentrate the sludge. In the prior art, three common sludge concentration methods are a gravity concentration method, an air flotation concentration method and a centrifugal concentration method, wherein the air flotation concentration method is mostly used for concentrating the sludge with lighter sludge particles.

When the sludge is subjected to air floatation concentration, a worker can aerate and stir the sludge tank so that sludge particles float upwards under the action of fine bubbles, a floating slag layer is formed on the surface of the sludge tank, and then the floating slag layer is scraped out of the tank by a mud scraper, so that the purpose of reducing the water content of the sludge is realized.

However, the stirring effect of the existing device on the sludge is limited, and the sludge particles cannot be quickly mixed with bubbles generated by the aeration assembly, so that the working efficiency of sludge concentration is reduced. In addition, the aeration component in the existing device is also easily blocked by sludge particles, so that a worker needs to frequently clean and maintain the aeration component, thereby increasing the labor burden of the worker.

Disclosure of Invention

In view of the above, the present utility model aims to provide an air-float sludge concentrating apparatus to solve the above-mentioned technical problems.

In order to achieve the above purpose, the technical scheme of the utility model is realized as follows:

an air-float sludge concentrating apparatus comprising:

the shell comprises a discharge section, an aeration section and a feed section which are sequentially spliced from top to bottom, a mud inlet pipe and a drain pipe are arranged on the side wall of the feed section, a discharge box is arranged on the side wall of the discharge section, and the discharge box is communicated with the discharge section through a discharge notch; an air inlet cavity is formed in the side wall of the aeration section, an air inlet pipe is arranged on the outer side wall of the aeration section, a plurality of mounting notches are formed in the inner side wall of the aeration section, the air inlet pipe and the mounting notches are communicated with the air inlet cavity, and the plurality of mounting notches are annularly arranged on the periphery of the axis of the aeration section; a guide cover which is detachably connected is arranged on each mounting notch, a guide channel is formed between two adjacent guide covers, and a plurality of aeration holes are arranged on the side wall of the guide cover, which is close to the guide channel;

the stirring assembly comprises a driving motor and a stirring shaft, the stirring shaft is arranged in the shell, the stirring shaft is overlapped with the axis of the shell, an output shaft of the driving motor is connected with the stirring shaft, and spiral auger blades are arranged on the side wall of the stirring shaft;

the mud scraping assembly comprises a bearing disc and a mud scraping strip, the bearing disc is rotatably sleeved on the stirring shaft, the bearing disc is located above the spiral auger blade, the mud scraping strip is arranged on the bottom surface of the bearing disc, and the bottom surface of the mud scraping strip is flush with the bottom side wall of the discharge notch.

Further, the inside first filter that is equipped with of installation incision is equipped with a plurality of first filtration holes on first filter, and the aperture of first filtration hole is less than the aperture of aeration hole.

Further, the air guide sleeve is an arc-shaped sleeve with an arc top facing the stirring shaft.

Further, a second filter plate is arranged in the discharging box, the top surface of the second filter plate is positioned below the side wall of the bottom of the discharging notch, and a plurality of second filter holes are formed in the second filter plate; the side wall of the discharge box is provided with a mud outlet pipe and a liquid discharge pipe, the pipe orifice of the mud outlet pipe is positioned above the second filter plate, the pipe orifice of the liquid discharge pipe is positioned below the second filter plate, and the liquid discharge pipe is communicated with the mud inlet pipe.

Further, the air floatation sludge concentration device also comprises a circulating pipe, one end of the circulating pipe is communicated with the sludge inlet pipe, and the other end of the circulating pipe is communicated with the liquid outlet pipe.

Further, the mud scraping assembly further comprises a driving gear and a driven gear, the driving gear is sleeved on the stirring shaft, an installation shaft is arranged on the top surface of the bearing disc, the driven gear is rotatably arranged on the installation shaft and meshed with the driving gear, and the pitch diameter of the driven gear is larger than that of the driving gear.

Further, a plurality of mud scraping strips are arranged on the bottom surface of the bearing disc in a radial manner,

further, the stirring shaft comprises a connecting section, a positioning section and a stirring section which are sequentially connected from top to bottom, the diameter of the positioning section is larger than that of the connecting section, the bearing disc is sleeved on the connecting section through a bearing, and the spiral auger blade is arranged on the side wall of the stirring section.

Compared with the prior art, the air floatation sludge concentration device has the following advantages:

(1) The utility model relates to a sludge concentrating device by an air floatation method, wherein a plurality of guide plates are arranged on the inner side wall of an aeration section, aeration holes are formed in the guide plates, and a guide channel is formed between two adjacent guide plates. When the sludge to be treated enters the shell, the rotation of the spiral auger blade can enable the sludge to be axially stirred in the shell from bottom to top, and the flow direction of the sludge can be disturbed by the flow guide channel, so that the micro bubbles generated by the aeration holes are efficiently and uniformly mixed with the sludge, and the concentration efficiency of the sludge is improved. And secondly, because the aeration holes in the device are arranged on the side wall of the guide plate, which is close to the guide channel, the probability of blocking the aeration holes by sludge can be reduced, and thus, the cleaning and maintenance workload of equipment is reduced. In addition, this device still is equipped with rotatable mud subassembly of scraping on stirring the axle, when driving motor drives stirring the axle and rotates, scrapes the mud subassembly and can rotate along with it, consequently can retrench device quantity, makes the dross layer get into the discharging case in the middle of fast.

(2) According to the air floatation sludge concentration device, the first filter plate is arranged in the installation notch, fine sludge particles entering the air guide sleeve can be intercepted by arranging the first filter plate, and therefore the air inlet cavity is prevented from being blocked.

(3) The utility model relates to a sludge concentrating device by an air floatation method, which can be communicated with a sludge inlet pipe and a water outlet pipe through circulating pipes and can be communicated with a discharge box and the sludge inlet pipe through the liquid outlet pipe. When the sludge is concentrated, a worker can drive the sludge in the device to carry out circulating treatment according to actual conditions, so that the quality of sludge concentration is improved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. In the drawings:

FIG. 1 is a schematic diagram of a device for concentrating sludge by an air floatation method according to an embodiment of the utility model;

FIG. 2 is a cross-sectional view of an air-float sludge concentrating apparatus according to an embodiment of the present utility model;

FIG. 3 is an exploded view of a housing according to an embodiment of the present utility model;

FIG. 4 is a schematic view of the structure of the aeration section, the first filter plate and the pod according to the embodiment of the present utility model;

fig. 5 is a schematic structural view of a mud scraping assembly according to an embodiment of the present utility model.

Reference numerals illustrate:

1-a discharging section; 11, a discharge box; 12-a second filter plate; 13-a mud outlet pipe; 14-a liquid discharge pipe; 2-an aeration section; 21-an air intake cavity; 22-mounting notch; 23-an air inlet pipe; 3-a feeding section; 31-a mud inlet pipe; 32-a liquid outlet pipe; 4-a diversion cover; 41-aeration holes; 51-driving a motor; 52-stirring shaft; 53-spiral auger leaf; 61-a carrier tray; 611-mounting a shaft; 62-scraping mud strips; 63-a drive gear; 64-driven gear; 7-a first filter plate; 8-circulating pipe.

Detailed Description

It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art in a specific case.

The utility model will be described in detail below with reference to the drawings in connection with embodiments.

The structure of the air-float sludge concentrating apparatus can be schematically shown in fig. 1 to 5, and the air-float sludge concentrating apparatus according to the embodiment includes: the device comprises a shell, a stirring assembly and a mud scraping assembly. When using, the casing is used for providing the processing space for the concentration of mud to treat the inside aeration of mud, turn over and stir the inside mud of subassembly for stirring the casing, thereby make mud and the bubble homogeneous mixing that aeration produced, scrape mud subassembly and be used for scraping the mud dross that floats at the top layer, thereby be convenient for collect mud dross.

Specifically, as shown in fig. 2 and 3, the shell comprises a discharge section 1, an aeration section 2 and a feed section 3 which are sequentially spliced from top to bottom, wherein a mud inlet pipe 31 and a drain pipe 32 are arranged on the side wall of the feed section 3, a discharge box 11 for collecting sludge scum is further arranged on the side wall of the discharge section 1, and the discharge box 11 is communicated with the discharge section 1 through a discharge notch arranged on the side wall of the discharge section 1.

For the convenience of assembly, the joint parts of the discharging section 1, the aeration section 2 and the feeding section 3 should be provided with connecting flanges by staff, and when splicing is carried out, sealing structures such as rubber gaskets and the like should be arranged between two adjacent connecting flanges, so that the sludge is prevented from leaking outwards along a splicing gap in the concentration process.

In use, sludge to be treated will enter the interior of the housing through the sludge inlet pipe 31, and the aeration section 2 will aerate the interior of the sludge so that a large number of micro-bubbles will be present in the interior of the sludge to be treated. Under the stirring of the stirring component, the tiny bubbles can be uniformly dispersed in the sludge to be treated and gradually coated outside the sludge particles. Because the coating of the micro bubbles can improve the buoyancy of the sludge particles, the coated sludge particles float upwards, so that a floating slag layer appears at the top of the sludge to be treated. The sludge scraping assembly can enable the floating slag layer to enter the discharge box 11, and further air-float concentration treatment of sludge is achieved.

To achieve agitation of the sludge to be treated, the agitation assembly may include a driving motor 51 and an agitation shaft 52, wherein the agitation shaft 52 is disposed inside the housing, the agitation shaft 52 coincides with the axis of the housing, an output shaft of the driving motor 51 is connected to the agitation shaft 52, and a spiral auger 53 is disposed on a side wall of the agitation shaft 52. When the driving motor 51 is started, the stirring shaft 52 drives the spiral auger blade 53 to rotate, and at the moment, the sludge to be treated in the shell is axially stirred from bottom to top, so that the sludge to be treated is prevented from depositing in the feeding section 3, and sludge particles in the sludge to be treated are uniformly dispersed in the shell.

In order to realize the aeration function of the aeration section 2, in this embodiment, an air inlet cavity 21 is provided inside the side wall of the aeration section 2, and an air inlet pipe 23 and a plurality of mounting notches 22 are respectively provided on the outer side and the inner side wall of the aeration section 2, the air inlet pipe 23 and the mounting notches 22 should be communicated with the air inlet cavity 21, and the plurality of mounting notches 22 should be annularly arranged on the circumferential side of the axis of the aeration section 2. In addition, each mounting notch 22 should be provided with a detachably connected air guide sleeve 4, an air guide channel is formed between two adjacent air guide sleeves 4, and a plurality of aeration holes 41 are formed on the side wall of the air guide sleeve 4 close to the air guide channel. Before use, the worker should connect the air inlet pipe 23 with the air outlet pipe of an external air source (such as an air pump, etc.). When the aeration operation is required, the air flow generated by the external air source enters the air inlet cavity 21 along the air inlet pipe 23, is uniformly distributed into the air guide covers 4 through the plurality of mounting notches 22, and enters the sludge to be treated along the aeration holes 41.

Because this device forms the water conservancy diversion passageway between two adjacent kuppe 4, consequently when waiting to handle mud flows from bottom to top under stirring the effect of subassembly, the existence of water conservancy diversion passageway can disturb the flow direction of mud to make mud granule and aeration process produced tiny bubble more even mix. In addition, because the aeration holes 41 are formed in the side wall, close to the diversion channel, of the diversion cover 4, when sludge is stirred, the flowing direction of the sludge is not right opposite to the opening direction of the aeration holes 41, so that the probability that sludge particles block the aeration holes 41 can be reduced, the service life of the device is prolonged, and frequent cleaning and maintenance of the diversion cover 4 by workers are avoided.

Alternatively, to enhance the turbulence effect of the air guide sleeve 4 on the sludge, the air guide sleeve 4 may be configured as an arc-shaped sleeve with an arc top facing the stirring shaft 52 in this embodiment. When the sludge flows from bottom to top in the shell, the sludge which is not contacted with the air guide sleeve 4 flows upwards along the air guide channel, and the sludge contacted with the air guide sleeve 4 gathers towards the area where the stirring shaft 52 is positioned under the action of the arc-shaped cover, so that the sludge forms different flowing directions when passing through the aeration section 2, and further forms local turbulence, and the mixing effect of micro bubbles and sludge particles is enhanced.

In addition, in order to prevent sludge particles with smaller particle sizes from entering the air intake cavity 21 along the aeration holes 41, as shown in fig. 4, the present embodiment may further be provided with a detachable first filter plate 7 inside the installation slit 22. Specifically, a plurality of first filter holes having a smaller pore diameter than the aeration holes 41 should be provided in the first filter plate 7. When the sludge particles with smaller particle size pass through the aeration holes 41 and enter the air guide cover 4, the first filter plate 7 can intercept the sludge particles, so that the air inlet cavity 21 is prevented from being blocked by the sludge particles. Correspondingly, the staff can also dismantle and clean the air guide sleeve 4 and the first filter plate 7 after the device runs for a period of time, so that the accumulation and blockage of sludge particles in the air guide sleeve 4 are avoided.

To facilitate the scraping of the layer of scum floating on top of the sludge into the discharge box 11, the sludge scraping assembly may comprise a carrying tray 61 and a sludge scraping strip 62. Specifically, the bearing disc 61 is rotatably sleeved on the stirring shaft 52, the bearing disc 61 is located above the spiral auger blade 53, the mud scraping strip 62 is disposed on the bottom surface of the bearing disc 61, and the bottom surface of the mud scraping strip 62 is flush with the bottom side wall of the discharge notch. When the driving motor 51 drives the stirring shaft 52 to rotate, the bearing disc 61 rotates along with the stirring shaft, and the floating slag layer is scraped by the scraping strip 62, so that the slag layer enters the discharge box 11 along the discharge notch.

As an alternative implementation of the present embodiment, in order to enhance the efficiency of scraping the slag layer of the sludge scraping assembly, a plurality of sludge scraping strips 62 may be provided, and the plurality of sludge scraping strips 62 should be radially arranged on the bottom surface of the carrier tray 61. When the carrying tray 61 rotates, the plurality of radially arranged sludge scraping strips 62 scrape the floating slag layer at a higher frequency, so that the separation efficiency of the slag layer and the sludge can be improved, and the concentration speed of the sludge by the air floatation method can be increased.

Optionally, to facilitate axial positioning of the mud scraping assembly, the stirring shaft 52 may include a connection section, a positioning section, and a stirring section sequentially connected from top to bottom, and the diameter of the positioning section should be greater than the diameter of the connection section. During assembly, the operator can set the carrier plate 61 on the connecting section via the bearing housing and set the spiral auger blade 53 on the side wall of the stirring section. Because the diameter of the positioning section is larger than that of the connecting section, the top end face of the positioning section can axially limit the bearing, so that the axial movement of the mud scraping assembly in the working process is prevented.

In addition, in order to facilitate control of the rotational speed of the mud scraping assembly, as shown in fig. 5, the mud scraping assembly may further include a driving gear 63 and a driven gear 64, and the pitch diameter of the driven gear 64 should be greater than that of the driving gear 63. For easy installation, the top surface of the carrying disc 61 should be provided with an installation shaft 611, and when the assembly is performed, the driving gear 63 is fixedly sleeved on the stirring shaft 52, the driven gear 64 is rotatably arranged on the installation shaft 611, and the driven gear 64 is meshed with the driving gear 63.

Because the bearing plate 61 is rotationally connected with the stirring shaft 52 through the bearing, and the pitch diameter of the driven gear 64 is larger than that of the driving gear 63, when the stirring shaft 52 rotates, the driving gear 63 and the driven gear 64 cooperate to drive the bearing plate 61 to rotate at a lower speed than that of the stirring shaft 52, and sufficient time can be provided for the floating of the sludge particles by reducing the rotation speed of the bearing plate 61, so that more sludge particles are contained in the scum layer, and the sludge particles can enter the discharge box 11 more efficiently, thereby improving the collection efficiency of the sludge particles.

Optionally, in order to promote the concentration effect of this device to mud, be equipped with second filter 12 in discharging case 11 inside. Specifically, the top surface of the second filter plate 12 should be located below the bottom sidewall of the discharge slot, and a plurality of second filter holes are formed in the second filter plate 12. Correspondingly, a mud outlet pipe 13 and a drain pipe 14 are also arranged on the side wall of the discharge box 11, wherein the pipe orifice of the mud outlet pipe 13 is positioned above the second filter plate 12, and the pipe orifice of the drain pipe 14 is positioned below the second filter plate 12. After the floating slag layer enters the discharge box 11 under the action of the mud scraping assembly, the second filter plate 12 can bear the floating slag layer, at the moment, liquid phase components in the floating slag layer pass through the second filter plate 12 and leave the discharge box 11 through the liquid discharge pipe 14, sludge particles in the floating slag layer are intercepted above the second filter plate 12, and finally leave the device in a form of concentrated sludge along the mud discharge pipe 13.

In addition, in order to further improve the sludge concentration effect of the device, the air floatation sludge concentration device of the embodiment can also perform circulating concentration treatment on sludge to be treated. In order to realize the circulating concentration of the sludge, the air-float sludge concentration device can further comprise a circulating pipe 8, when the circulating pipe 8 is connected with a pipeline, one end of the circulating pipe 8 is communicated with a sludge inlet pipe 31, the other end of the circulating pipe is communicated with a liquid outlet pipe 32, and the liquid outlet pipe 14 is communicated with the sludge inlet pipe 31. In the actual working process, the staff can choose whether to carry out the circulating concentration treatment according to the concentration effect of the sludge to be treated. When the concentration degree of the sludge meets the actual requirement, staff can discharge the liquid phase components in the shell out of the device through the liquid outlet pipe 32. When the concentration degree of the sludge is lower than the actual requirement, the worker can make the material entering the liquid outlet pipe 32 enter the sludge inlet pipe 31 again through the circulating pipe 8 by using the control valve preset on the liquid outlet pipe 32, so that the material can enter the device again for air floatation concentration, and the concentration degree of the sludge is improved. Correspondingly, the liquid phase components collected in the discharge box 11 can be led into the shell by connecting the liquid discharge pipe 14 with the mud inlet pipe 31, so that the liquid phase material content of sludge to be treated in the shell is improved, the difficulty of floating sludge particles by means of micro bubbles is reduced, and the efficiency of concentrating the sludge by the air floatation method is improved.

Effects of the above scheme are described below:

the embodiment provides a device for concentrating sludge by an air floatation method, which can improve the mixing uniformity of sludge particles and tiny bubbles through the cooperation of a guide cover and a stirring component, thereby improving the efficiency of concentrating the sludge by the air floatation method. Secondly, because this device sets up the aeration hole on the lateral wall that the kuppe is close to the water conservancy diversion passageway, and is equipped with first filter in the installation incision is inside, consequently can reduce the jam probability of air inlet cavity to avoid the staff to carry out frequent clean maintenance to this device. In addition, the device can also carry out circulating concentration treatment on the sludge to be treated according to actual conditions, so that the concentration degree of the sludge can meet actual demands.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.

Claims (8)

1. An air-float sludge concentrating apparatus, comprising:

the device comprises a shell, wherein the shell comprises a discharge section (1), an aeration section (2) and a feed section (3) which are sequentially spliced from top to bottom, a mud inlet pipe (31) and a liquid outlet pipe (32) are arranged on the side wall of the feed section (3), a discharge box (11) is arranged on the side wall of the discharge section (1), and the discharge box (11) is communicated with the discharge section (1) through a discharge notch; an air inlet cavity (21) is formed in the side wall of the aeration section (2), an air inlet pipe (23) is formed in the outer side wall of the aeration section (2), a plurality of mounting notches (22) are formed in the inner side wall of the aeration section (2), the air inlet pipe (23) and the mounting notches (22) are communicated with the air inlet cavity (21), and the plurality of mounting notches (22) are annularly arranged on the periphery of the axis of the aeration section (2); a guide cover (4) which is detachably connected is arranged on each mounting notch (22), a guide channel is formed between two adjacent guide covers (4), and a plurality of aeration holes (41) are formed on the side wall of the guide cover (4) close to the guide channel;

the stirring assembly comprises a driving motor (51) and a stirring shaft (52), the stirring shaft (52) is arranged in the shell, the stirring shaft (52) is overlapped with the axis of the shell, an output shaft of the driving motor (51) is connected with the stirring shaft (52), and a spiral auger blade (53) is arranged on the side wall of the stirring shaft (52);

the mud scraping assembly comprises a bearing disc (61) and a mud scraping strip (62), the bearing disc (61) is rotatably sleeved on the stirring shaft (52), the bearing disc (61) is located above the spiral auger blade (53), the mud scraping strip (62) is arranged on the bottom surface of the bearing disc (61), and the bottom surface of the mud scraping strip (62) is flush with the bottom side wall of the discharging notch.

2. An air-float sludge concentrating apparatus according to claim 1, wherein: the inside first filter (7) that is equipped with of installation incision (22), be equipped with a plurality of first filtration holes on first filter (7), and the aperture of first filtration hole is less than the aperture of aeration hole (41).

3. An air-float sludge concentrating apparatus according to claim 1, wherein: the air guide sleeve (4) is an arc-shaped sleeve with an arc top facing the stirring shaft (52).

4. An air-float sludge concentrating apparatus according to claim 1, wherein: a second filter plate (12) is arranged in the discharging box (11), the top surface of the second filter plate (12) is positioned below the side wall of the bottom of the discharging notch, and a plurality of second filter holes are formed in the second filter plate (12); the side wall of the discharging box (11) is provided with a mud outlet pipe (13) and a liquid discharge pipe (14), the pipe orifice of the mud outlet pipe (13) is positioned above the second filter plate (12), the pipe orifice of the liquid discharge pipe (14) is positioned below the second filter plate (12), and the liquid discharge pipe (14) is communicated with the mud inlet pipe (31).

5. The apparatus for concentrating sludge by air-float process according to claim 4, wherein: the air-float sludge concentration device also comprises a circulating pipe (8), one end of the circulating pipe (8) is communicated with the sludge inlet pipe (31), and the other end of the circulating pipe is communicated with the liquid outlet pipe (32).

6. An air-float sludge concentrating apparatus according to claim 1, wherein: the mud scraping assembly further comprises a driving gear (63) and a driven gear (64), the driving gear (63) is sleeved on the stirring shaft (52), an installation shaft (611) is arranged on the top surface of the bearing disc (61), the driven gear (64) is rotatably arranged on the installation shaft (611), the driven gear (64) is meshed with the driving gear (63), and the pitch circle diameter of the driven gear (64) is larger than that of the driving gear (63).

7. An air-float sludge concentrating apparatus according to claim 1, wherein: the plurality of mud scraping strips (62) are arranged on the bottom surface of the bearing disc (61) in a radial mode.

8. An air-float sludge concentrating apparatus according to claim 1, wherein: the stirring shaft (52) comprises a connecting section, a positioning section and a stirring section which are sequentially connected from top to bottom, the diameter of the positioning section is larger than that of the connecting section, the bearing disc (61) is sleeved on the connecting section through a bearing, and the spiral auger blade (53) is arranged on the side wall of the stirring section.