Efficient dissolved air flotation machine

Abstract

The utility model discloses an efficient dissolved air flotation machine, which belongs to the technical field of wastewater treatment and comprises an integrated air flotation tank and an air dissolving system. The integrated air floatation tank comprises a sewage inlet, an air floatation reaction area, a connecting pipe, a water dissolving area and a water return area which are sequentially communicated in the water flow direction. The gas dissolving system comprises a gas-liquid mixing pump, a gas dissolving tank, a pressure relief valve and a plurality of releasers which are communicated in sequence, the input end of the gas-liquid mixing pump is communicated with the water dissolving area, and the releasers are communicated with the end, close to the sewage inlet, of the air flotation reaction area. The air dissolving system recycles part of treated water as backflow water through the water dissolving area, the backflow water is guided into the air-liquid mixing pump, and the air-liquid mixing pump automatically sucks air to be preliminarily mixed with the backflow water to enter the air dissolving tank. Under the combined action of the high pressure provided by the gas-liquid mixing pump and the pressurizing space provided by the dissolved air tank, the air and the backflow water are further mixed and fused into the dissolved air water, and other gas path pipelines do not need to be laid.

Description

Technical Field

[0001] The utility model belongs to the technical field of wastewater treatment, in particular to a high-efficiency dissolved air flotation machine. Background Art

[0002] Dissolved air flotation is an efficient solid-liquid separation technology widely used in water treatment, especially for removing suspended solids, grease and other tiny particles in water. The basic principle of dissolved air flotation is to dissolve air in water by pressurizing it, and then release the water rich in dissolved air by decompressing it, so that the air precipitates in the water in the form of tiny bubbles. These tiny bubbles will attach to suspended particles or grease to form a bubble-particle complex, thereby increasing its buoyancy and causing it to rise to the surface of the water, forming a scum layer that is easy to remove.

[0003] In the sewage treatment process, dissolved air flotation technology, combined with the use of flocculants, can achieve a very high purification rate and has a good purification effect on fine dust suspended in sewage. However, traditional dissolved air flotation machines have some shortcomings: they need to be used with a centrifugal pump and compressed air, which is greatly affected by the air source and has a relatively high cost; some flocs sink to the bottom and affect the continuous operation of the system; the commonly used TS, TJ and TV type releasers have complex structures, narrow channels and easy blockage, and cannot handle sewage with a large amount of slag; using clean water as dissolved air water increases the cost of laying pipelines. Utility Model Content

[0004] The purpose of the utility model is to provide a high-efficiency dissolved air flotation machine to solve the problems raised in the above-mentioned prior art.

[0005] Provided is a high-efficiency dissolved air flotation machine, comprising:

[0006] An integrated flotation tank comprises a sewage inlet, a flotation reaction zone, a connecting pipe, a water dissolving zone and a water return zone which are sequentially connected along the flow direction of the water flow, wherein one end of the flotation reaction zone away from the sewage inlet forms a material drop zone;

[0007] The gas dissolving system comprises a gas-liquid mixing pump, a gas dissolving tank, a pressure relief valve and several releasers which are connected in sequence. The input end of the gas-liquid mixing pump is connected to the water dissolving area, and the several releasers are connected to one end of the gas flotation reaction area close to the sewage inlet.

[0008] Furthermore, a water flow regulating valve is provided between the input port of the gas-liquid mixing pump and the water dissolving area, and a pressure gauge is provided between the output port of the gas-liquid mixing pump and the gas dissolving tank. The water flow regulating valve is used to control the water flow rate input from the water dissolving area to the gas-liquid mixing pump, so as to control the reasonable stock of gas-dissolving water in the gas dissolving tank and avoid excessive pressure in the gas dissolving system. The pressure gauge can monitor the gas-liquid pressure between the gas-liquid mixing pump and the gas dissolving tank in real time, so as to make pressure adjustment actions in time to stabilize the pressure.

[0009] Furthermore, it also includes an upper scraper arranged on the top of the flotation reaction zone, the upper scraper includes a first drive mechanism, a first sprocket mechanism and a plurality of first scrapers, the first sprocket mechanism is in transmission connection with the first drive mechanism, and the first sprocket mechanism is used to drive the plurality of first scrapers opposite to the floating pool to move toward the material drop zone. The first scraper contacts the liquid surface of the floating pool in the flotation reaction zone and extends below the liquid surface. When the bubbles carry the slag and drive the slag to float to the water surface, the first scraper moves and drives the liquid surface and the slag on the liquid surface to move toward the material drop zone, and finally scrapes this part of the liquid and the slag into the material drop zone together.

[0010] Furthermore, a slag discharge inclined plate is provided at the connection part between the flotation reaction zone and the material discharge zone, and an angle of α is formed between the slag discharge inclined plate and the horizontal plane, and the angle α is 5° to 20°. The slag discharge inclined plate cooperates with the first scraper, and when the liquid level of the floating pool is lower than the top of the slag discharge inclined plate, the slag is scraped out by the first scraper, giving the slag a certain drainage time, further concentrating the slag, and reducing the moisture of the slag when it is discharged from the material discharge zone.

[0011] Furthermore, it also includes a lower scraper and a screw pump arranged at the bottom of the flotation reaction zone, the lower scraper includes a second drive mechanism, a second sprocket mechanism and a plurality of second scrapers, the second sprocket mechanism is in transmission connection with the second drive mechanism, the screw pump is arranged at the bottom of the flotation reaction zone near one end of the material drop zone, the second sprocket mechanism is used to drive the plurality of second scrapers at the top to move toward the screw pump. Some of the slag that is too heavy or sinks due to floc breakage falls to the top of the second sprocket mechanism, and is brought to the screw pump end of the flotation reaction zone by the second scraper, and is discharged under the drive of the screw pump.

[0012] Furthermore, the second sprocket mechanism is arranged in an inclined shape as a whole, and an angle of β is formed between the second sprocket mechanism and the horizontal plane, and the β angle is 10° to 30°. The inclined design increases the shielding surface of the second scraper in the vertical direction of the floating pond, which is conducive to the slag being shielded by the second scraper and thus settling; and driven by the second scraper, the bottom and middle sewage in the flotation reaction zone can form a circulating water flow that flows obliquely toward the slag discharge port, and the slag in the middle of the floating pond is also guided to the releaser and the slag discharge port, so that the middle area of ​​the floating pond is kept clean, especially the water flow area near the connecting pipe is kept clean, the cleanliness of the recycled water is improved, and further ensure that the slag is prevented from entering the dissolved air system from the dissolved water area to cause the dissolved air system to be blocked.

[0013] Furthermore, an overflow plate is provided between the water dissolving area and the water return area, for adjusting the water level of the floating pool in the air flotation reaction area.

[0014] Furthermore, the air dissolving tank forms an angle of γ with the horizontal plane, and the angle γ is 10° to 40°. When the reflux water is located inside the air dissolving tank, the reflux water can increase the contact area with the air when the air dissolving tank is tilted, so that the efficiency of the reflux water and air dissolution is enhanced under the action of high pressure.

[0015] Furthermore, the output pipe opening of the releaser is provided with a reducer which can release the pressure of the dissolved gas water once and accelerate the release of tiny bubbles.

[0016] Furthermore, the output pipe opening of the releaser is provided with an arc-shaped guide plate, which can play a role in gathering and guiding, and directionally transport the dissolved air water toward the sewage inlet.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] The pressurized dissolved air solution adopted by the dissolved air system is to recover part of the treated water from the dissolved water area as reflux water, and introduce the reflux water into the gas-liquid mixing pump. The gas-liquid mixing pump forms negative pressure through the rotation of the impeller to automatically inhale air, so that the air and reflux water are initially mixed and enter the dissolved air tank. Under the combined effect of the high pressure provided by the gas-liquid mixing pump and the pressurized space provided by the dissolved air tank, the air and reflux water are further mixed and integrated into dissolved air water, and there is no need to lay other air pipelines. Part of the water in the dissolved water area flows back to participate in the dissolved air again, and there is no need to provide additional clean water for dissolved air. The air flotation machine provided in this application has a high efficiency in the dissolved air process, a simple dissolved air structure, and a stable operation process, which effectively reduces the use cost of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present drawings or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present drawings. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0020] Figure 1 It is a schematic diagram of the overall structure of a high-efficiency dissolved air flotation machine;

[0021] Figure 2 A schematic diagram of the structure of the gas dissolving system provided by the embodiment of the utility model;

[0022] Figure 3 A schematic diagram of the structure of a releaser provided in an embodiment of the utility model;

[0023] Figure 4 This is the structural layout diagram of the slag discharge inclined plate;

[0024] Figure 5It is the structural arrangement diagram of the air dissolving tank and the second sprocket mechanism;

[0025] Figure 6 A partial structural schematic diagram of an upper scraper provided in an embodiment of the utility model.

[0026] In the figure: 1. integrated flotation tank; 11. sewage inlet; 12. flotation reaction zone; 13. connecting pipe; 14. water dissolving zone; 15. return water zone; 16. material dropping zone; 17. slag discharge port; 18. slag discharge inclined plate; 2. dissolved air system; 21. gas-liquid mixing pump; 22. dissolved air tank; 23. pressure relief valve; 24. releaser; 241. reducer; 242. arc guide plate; 25. water flow regulating valve; 26. pressure gauge; 3. upper scraper; 31. first drive mechanism; 32. first sprocket mechanism; 33. first scraper; 4. lower scraper; 41. second drive mechanism; 42. second sprocket mechanism; 43. second scraper; 5. overflow plate; 6. screw pump. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is described and illustrated below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. Based on the embodiments provided in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0028] Obviously, the drawings described below are only some examples or embodiments of the present application. For ordinary technicians in this field, the present application can also be applied to other similar scenarios based on these drawings without creative work. In addition, it can also be understood that although the efforts made in this development process may be complicated and lengthy, for ordinary technicians in this field related to the content disclosed in this application, some changes in design, manufacturing or production based on the technical content disclosed in this application are just conventional technical means, and should not be understood as insufficient content disclosed in this application.

[0029] However, unnecessary detailed descriptions may be omitted. For example, detailed descriptions of well-known matters and repeated descriptions of substantially the same structures may be omitted. This is to avoid the following description from becoming unnecessarily lengthy and to facilitate understanding by those skilled in the art. In addition, the drawings and the following description are provided to enable those skilled in the art to fully understand the present application and are not intended to limit the subject matter described in the claims.

[0030] See also Figure 1-2As shown, in the embodiment of the utility model, a high-efficiency dissolved air flotation machine includes an integrated air flotation tank 1 and an air dissolving system 2. The integrated air flotation tank 1 includes a sewage inlet 11, an air flotation reaction zone 12, a connecting pipe 13, a water dissolving zone 14 and a return water zone 15 which are sequentially connected along the flow direction of the water flow, and the end of the air flotation reaction zone 12 away from the sewage inlet 11 forms a material drop zone 16. The air dissolving system 2 includes a gas-liquid mixing pump 21, an air dissolving tank 22, a pressure relief valve 23 and a plurality of releasers 24 which are sequentially connected, the input end of the gas-liquid mixing pump 21 is connected to the water dissolving zone 14, and the plurality of releasers 24 are connected to the end of the air flotation reaction zone 12 close to the sewage inlet 11.

[0031] The dissolved air system 2 is located as a whole on the outer side of the integrated flotation tank 1. When the flotation machine is working, the dissolved air system 2 takes part of the water from the dissolved water area 14 of the integrated flotation tank 1 to start the reflux dissolved air. The water in the dissolved water area 14 is the water that has gone through the whole set of treatment procedures of the flotation machine. The solid content in the water is low, which avoids the subsequent impact on the dissolved air effect and the risk of pipeline blockage, and there is no need to build a separate return clean water pipeline. When the reflux water passes through the gas-liquid mixing pump 21, the gas-liquid mixing pump 21 automatically inhales air, and the reflux water and the inhaled air are mixed into the dissolved air tank 22. Under the combined effect of the pressure generated by the gas-liquid mixing pump 21 and the pressurized space provided by the dissolved air tank 22, the air and the reflux water are further mixed and integrated into dissolved air water.

[0032] After the dissolved air water passes through the air dissolving tank 22, it is firstly depressurized through the pressure relief valve 23, so that the dissolved air water has a tendency to initially release bubbles. The releasers 24 are installed at the sewage inlet 11 end of the integrated flotation tank 1 in a multi-point distribution. After the dissolved air water is depressurized, it enters the flotation reaction zone 12 and quickly releases tiny bubbles toward the sewage inlet 11. After the sewage to which the flocculant has been added in the previous process enters the flotation reaction zone 12, the flocs in it quickly combine with the tiny bubbles rising from the bottom, and the bubbles and flocs float to the surface.

[0033] After the dust contained in the sewage is removed, it enters the water dissolving area 14 through the connecting pipe 13 connected to the flotation reaction area 12. The connecting pipe 13 is located in the middle of the baffle between the flotation reaction area 12 and the material dropping area 16. The connecting pipe 13 set in the middle of the baffle is not subject to secondary pollution from the floating scum on the water surface and avoids interference from the sediment below. Part of the water in the water dissolving area 14 flows back from the dissolved air system 2 to dissolve gas again, and part of it enters the return water area 15 and is discharged as treated water.

[0034] Specifically, both ends of the gas dissolving tank 22 may be provided with ball valves for controlling the medium input into the gas dissolving tank 22 and maintaining the airtight state and flow rate.

[0035] A water flow regulating valve 25 is provided between the input port of the gas-liquid mixing pump 21 and the water dissolving area 14, and a pressure gauge 26 is provided between the output port of the gas-liquid mixing pump 21 and the gas dissolving tank 22. The water flow regulating valve 25 is used to control the water flow rate input from the water dissolving area 14 to the gas-liquid mixing pump 21, so as to control the reasonable stock of gas-dissolving water in the gas dissolving tank 22 and avoid excessive pressure in the gas dissolving system. The pressure gauge 26 can monitor the gas-liquid pressure between the gas-liquid mixing pump 21 and the gas dissolving tank 22 in real time, so as to make pressure adjustment actions in time to stabilize the pressure.

[0036] The flotation machine also includes an upper scraper 3 disposed on the top of the flotation reaction zone 12, and the upper scraper 3 includes a first drive mechanism 31, a first sprocket mechanism 32, and a plurality of first scrapers 33. The first sprocket mechanism 32 drives the belt or chain belt through a plurality of rollers for transmission, and the first drive mechanism 31 drives the rollers to rotate, so that the belt or chain belt rotates periodically along a predetermined track. A plurality of first scrapers 33 are fixed on the surface of the belt or chain belt, and are driven by the belt or chain belt to rotate synchronously. The first scraper 33 is used to scrape the floating flocs on the surface of the floating pool, so that the flocs are guided to the drop zone 16. Scraping along the direction of the water flow can reduce the disturbance of the first scraper 33 on the water surface of the flotation reaction zone 12, and avoid breaking up the flocs.

[0037] In one embodiment, the liquid level of the floating pond is flush with or slightly lower than the top of the baffle between the flotation reaction zone 12 and the material drop zone 16, and the first scraper 33 carries part of the water flow and the flocculants to push both out of the top of the baffle to remove the flocculants. However, this solution will remove the slag while causing the slag to carry a large amount of water and be discharged from the material drop zone 16, which is not conducive to the subsequent separation of the slag and water.

[0038] In one embodiment, a slag discharge ramp 18 is provided at the connecting portion between the air flotation reaction zone 12 and the material discharge zone 16, and the first sprocket mechanism 32 is arranged in parallel with the slag discharge ramp 18 in the region where the first sprocket mechanism 32 moves along the slag discharge ramp 18, so that the first scraper 33 will not interfere with the movement along the slag discharge ramp 18. The water level of the floating pool is lower than the top of the slag discharge ramp 18. The first scraper 33 carries the slag and moves along the inclined surface of the slag discharge ramp 18. During this process, most of the water flow flows back into the floating pool, and the slag is pushed to the material discharge zone 16 for discharge, giving the slag a certain amount of drainage time, further concentrating the slag, and reducing the water carried by the slag when it is discharged from the material discharge zone 16.

[0039] For further information, see Figure 4As shown, the angle between the slag discharge inclined plate 18 and the horizontal plane is 5° to 20°. If the inclination angle of the slag discharge inclined plate 18 is too small, the height difference between the top of the slag discharge inclined plate 18 and the floating pond will be insufficient, the drainage time of the slag will be insufficient, and the drainage effect will be poor; if the length of the slag discharge inclined plate 18 is extended, the height difference can be increased, but the overall length of the flotation machine will be increased. If the inclination angle of the slag discharge inclined plate 18 is too large, the return rate of the slag will be increased, resulting in an increased probability of the slag sliding off the slag discharge inclined plate 18, a reduction in the single discharge amount of the slag from the drop zone 16, and a reduction in the sewage treatment efficiency.

[0040] See also Figure 1 and Figure 6 As shown, the flotation machine also includes a lower scraper 4 and a screw pump 6 arranged at the bottom of the flotation reaction zone 12. The lower scraper 4 includes a second drive mechanism 41, a second sprocket mechanism 42 and a plurality of second scrapers 43. The screw pump 6 is arranged at the bottom of the flotation reaction zone 12 near one end of the material drop zone 16. The second sprocket mechanism 42 also drives the belt or chain belt through a plurality of rollers. The second drive mechanism 41 drives the roller to rotate and then drives the plurality of second scrapers 43 to rotate synchronously through the belt or chain belt. Some of the slag that is too heavy or sinks due to floc breakage falls to the top of the second sprocket mechanism 42, and is driven by the second scraper 43 to move toward the screw pump 6, so that the slag is deposited at the screw pump 6 and is discharged through the slag discharge screw drive in the screw pump 6.

[0041] Driven by the second scraper 43 and pumped by the screw pump 6, the bottom and middle sewage in the flotation reaction zone 12 can form a water flow flowing toward the screw pump 6, guiding the slag in the middle of the floating pond to the screw pump 6, and actively collecting and discharging it through the screw pump 6. The middle area of ​​the floating pond is kept clean, especially the water flow area near the connecting pipe 13 is kept clean, the cleanliness of the recycled water is improved, and further ensure that the slag is prevented from entering the dissolved air system 2 from the dissolved water area 14 to cause the dissolved air system 2 to be blocked.

[0042] The bottom of the integrated flotation tank 1 near the sewage inlet 11 is provided with a slag discharge port 17. When the flotation reaction zone 12 needs to be cleaned, the second sprocket mechanism 42 can be driven in reverse by the second driving mechanism 41, thereby driving a plurality of second scrapers 43 to move toward the slag discharge port 17, so that the cleaned slag is discharged from the slag discharge port 17, thereby improving the cleaning effect and cleaning efficiency.

[0043] The second sprocket mechanism 42 is arranged in an inclined shape as a whole. In the vertical direction of the floating pond, the shielding surface formed by the inclined second sprocket mechanism 42 and the second scraper 43 is increased, thereby realizing inclined plate sedimentation and improving sedimentation efficiency.

[0044] See also Figure 1 and Figure 5As shown, the second sprocket mechanism 42 forms an angle of 10° to 30° with the horizontal plane. If the inclination angle of the second sprocket mechanism 42 is too small, the shielding surface formed by the second scrapers 43 will be insufficient in height, and the shielding and sedimentation effect of the slag will be poor. Since the top of the second sprocket mechanism 42 cannot exceed the connecting pipe 13 after inclination, the inclination angle of the second sprocket mechanism 42 is limited to within 30°.

[0045] See also Figure 2 and Figure 5 As shown, the angle between the gas dissolving tank 22 and the horizontal plane is 10° to 40°. By increasing the inclination angle of the gas dissolving tank 22, the reflux water is inclined relative to the radial plane of the gas dissolving tank 22, so that the exposed area of ​​the reflux water in the gas dissolving tank 22 can be increased, thereby increasing the contact area between the reflux water and the air. The inclination angle of the gas dissolving tank 22 cannot be too large, otherwise the exposed area of ​​the reflux water will be insufficient. The inclination angle of the gas dissolving tank 22 cannot be too small, otherwise the volume of dissolved water that can be stored in the gas dissolving tank 22 will be insufficient.

[0046] An overflow plate 5 is provided between the water dissolving zone 14 and the water return zone 15 . The overflow plate 5 can control the water level of the water dissolving zone 14 , and further control the water level of the floating pool in the air flotation reaction zone 12 under the action of water pressure.

[0047] See also Figure 2 and Figure 3 As shown, the output pipe of the releaser 24 is provided with a reducer 241, which is a tapered pipe structure with an inner diameter that changes from small to large along the flow direction of the dissolved air water. When the dissolved air water passes through the reducer 241, the dissolved air water can be depressurized for the second time through the expanded pipe diameter. After the pressure is released twice by the pressure relief valve 23 and the reducer 241, the dissolved air water can quickly release tiny bubbles and combine with flocs after entering the floating pond.

[0048] The output pipe opening of the releaser 24 is provided with an arc-shaped guide plate 242. The arc-shaped guide plate 242 limits the flow direction of the dissolved air water after the dissolved air water is sprayed out through the arc-shaped plate structure, and plays a guiding role.

[0049] It should be noted that the present application is not limited to the above-mentioned embodiments. The above-mentioned embodiments are only examples, and the embodiments having the same structure as the technical idea and exerting the same effect within the scope of the technical solution of the present application are all included in the technical scope of the present application. In addition, without departing from the scope of the main purpose of the present application, various modifications that can be thought of by those skilled in the art to the embodiments and other methods of combining some of the constituent elements in the embodiments are also included in the scope of the present application.

Claims

1. A high-efficiency dissolved air flotation machine, characterized in that: include: An integrated flotation tank (1) comprises a sewage inlet (11), a flotation reaction zone (12), a connecting pipe (13), a water dissolving zone (14) and a water return zone (15) which are sequentially connected along a water flow direction, wherein the end of the flotation reaction zone (12) away from the sewage inlet (11) forms a material drop zone (16); The gas dissolving system (2) comprises a gas-liquid mixing pump (21), a gas dissolving tank (22), a pressure relief valve (23) and a plurality of releasers (24) which are connected in sequence, wherein the input end of the gas-liquid mixing pump (21) is connected to the water dissolving area (14), and the plurality of releasers (24) are connected to one end of the gas flotation reaction area (12) close to the sewage inlet (11).

2. A high-efficiency dissolved air flotation machine according to claim 1, characterized in that: A water flow regulating valve (25) is provided between the input port of the gas-liquid mixing pump (21) and the water dissolving area (14), and a pressure gauge (26) is provided between the output port of the gas-liquid mixing pump (21) and the gas dissolving tank (22).

3. A high-efficiency dissolved air flotation machine according to claim 1, characterized in that: The invention also comprises an upper scraper (3) arranged at the top of the flotation reaction zone (12), wherein the upper scraper (3) comprises a first driving mechanism (31), a first sprocket mechanism (32) and a plurality of first scrapers (33), wherein the first sprocket mechanism (32) is transmission-connected to the first driving mechanism (31), and the first sprocket mechanism (32) is used to drive the plurality of first scrapers (33) opposite to the floating pool to move toward the material dropping zone (16).

4. A high-efficiency dissolved air flotation machine according to claim 3, characterized in that: A slag discharge inclined plate (18) is provided at the connection portion between the air flotation reaction zone (12) and the material discharge zone (16), and an angle of α is formed between the slag discharge inclined plate (18) and the horizontal, and the angle α is 5° to 20°.

5. A high-efficiency dissolved air flotation machine according to claim 1, characterized in that: The invention also comprises a lower scraper (4) and a screw pump (6) arranged at the bottom of the flotation reaction zone (12); the lower scraper (4) comprises a second driving mechanism (41), a second sprocket mechanism (42) and a plurality of second scrapers (43); the second sprocket mechanism (42) is transmission-connected to the second driving mechanism (41); the screw pump (6) is arranged at the bottom of the flotation reaction zone (12) near one end of the material dropping zone (16); the second sprocket mechanism (42) is used to drive the plurality of second scrapers (43) at the top to move toward the screw pump (6).

6. A high-efficiency dissolved air flotation machine according to claim 5, characterized in that: The second sprocket mechanism (42) is arranged in an inclined shape as a whole, and an angle of β degrees is formed between the second sprocket mechanism (42) and a horizontal plane, and the angle β is 10° to 30°.

7. A high-efficiency dissolved air flotation machine according to claim 1, characterized in that: An overflow plate (5) is provided between the water dissolving area (14) and the water returning area (15).

8. The high-efficiency dissolved air flotation machine according to claim 1, characterized in that: An angle of γ degrees is formed between the gas dissolving tank (22) and the horizontal plane, and the angle γ is 10° to 40°.

9. A high-efficiency dissolved air flotation machine according to claim 1, characterized in that: The output pipe opening of the releaser (24) is provided with a reducing pipe (241).

10. A high-efficiency dissolved air flotation machine according to claim 1, characterized in that: The output pipe opening of the releaser (24) is provided with an arc-shaped guide plate (242).

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