Air floatation equipment for sewage treatment

Abstract

The utility model relates to sewage treatment technical field especially sewage treatment is with air support equipment, including air support machine main part, air support machine main part is along the direction of sewage flow and is equipped with flocculation area, aeration tank and impurity separation area in proper order, the inside of aeration tank is equipped with a plurality of baffle, a plurality of baffle divide aeration tank into a plurality of aeration area, every aeration area all keep fluid communication with flocculation area alone, be equipped with aeration unit for producing air bubble in aeration area, aeration area is used for shortening the diffusion path of air bubble in it, avoid air bubble because of diffusion distance is too long and forms local deficient area, the utility model discloses through being added a plurality of baffle in aeration tank, divide into a plurality of aeration area, make every area independent bubble, scum adsorption, reduce the processing range of single area, reduce the influence that air bubble is unevenly distributed, effectively reduce local leak floating phenomenon.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to an air flotation device for wastewater treatment. Background Technology

[0002] Against the backdrop of rapid industrialization and urbanization, wastewater discharge continues to rise, and the composition of water quality is becoming increasingly complex. The pollutants contained in wastewater, such as suspended particles, colloidal substances, and grease, pose a severe challenge to wastewater treatment. To achieve wastewater discharge that meets standards or for reuse, efficient solid-liquid separation technology has become crucial. Air flotation equipment has been widely used in the field of wastewater treatment. Air flotation equipment mixes air and water into dissolved air water by setting up a dissolved air tank, which is then introduced into the wastewater in the aeration tank. The dissolved air water generates bubbles, and the bubbles adhere to the pollutant particles to form a complex with a density less than that of water. The pollutants are carried to the water surface by buoyancy, and then separated by methods such as sludge scraping.

[0003] However, during the process of pollutants coming into contact with air bubbles, the complex water flow in the aeration tank can easily form eddies or dead zones, causing the air bubbles to diffuse disorderly with the water flow and fail to evenly cover all pollutants. Air bubbles often exhibit local enrichment or scarcity. When pollutants enter the aeration tank, if they are in an area lacking air bubbles, the pollutant particles cannot effectively combine with enough air bubbles to form a stable floating complex. This causes some pollutants to directly enter subsequent stages with the water flow, resulting in leakage and increasing the difficulty of subsequent treatment.

[0004] Therefore, based on the above situation, it is necessary to design an air flotation device for wastewater treatment to solve the above problems. Utility Model Content

[0005] This invention provides an air flotation device for wastewater treatment to solve the problems in the prior art.

[0006] The technical problem solved by this utility model is achieved by the following technical solution:

[0007] A flotation device for wastewater treatment includes a flotation machine body. The flotation machine body is provided with a flocculation zone, an aeration tank, and an impurity separation zone in sequence along the direction of wastewater flow. The aeration tank is provided with multiple baffles, which divide the aeration tank into multiple aeration zones. Each aeration zone is individually fluidly connected to the flocculation zone. Each aeration zone is provided with an aeration unit for generating bubbles. The aeration zone is used to shorten the diffusion path of bubbles within it and avoid the formation of localized deficiencies due to excessively long diffusion distances.

[0008] Preferably, the aeration unit includes an internally hollow aeration plate and a plurality of aeration heads disposed on the aeration plate, and the aeration plate is connected to a delivery pipe for conveying dissolved air water.

[0009] Preferably, the aeration unit further includes a dissolved air tank and a main conveying pipe connected to the output end of the dissolved air tank, wherein the output end of the main conveying pipe is connected to the input end of a plurality of conveying branch pipes.

[0010] Preferably, the cross-sectional profile of the aeration plate is the same as that of the aeration zone.

[0011] Preferably, the height of the baffle is lower than the height of the aeration tank wall, and a gap is left between the top of the baffle and the liquid surface of the aeration tank.

[0012] Preferably, the multiple aeration heads are arranged in a regular array on the aeration plate that matches the shape of the aeration plate.

[0013] The beneficial effects of this utility model are: by adding multiple baffles in the aeration tank to divide it into multiple aeration zones, each zone can independently adsorb bubbles and scum, thereby reducing the treatment range of a single zone, reducing the impact of uneven bubble distribution, and effectively reducing local leakage. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0015] Figure 1 Schematic diagram of the three-dimensional structure provided by this utility model Figure 1 ;

[0016] Figure 2 Schematic diagram of the three-dimensional structure provided by this utility model Figure 2 ;

[0017] Figure 3 A cross-sectional structural schematic diagram provided for this utility model;

[0018] Figure 4 This is a three-dimensional structural diagram of the aeration unit in this utility model.

[0019] In the diagram, 1. Air flotation machine main body; 2. Flocculation zone; 3. Aeration tank; 4. Impurity separation zone; 5. Baffle plate; 6. Aeration zone; 7. Aeration unit; 71. Aeration plate; 72. Aeration head; 73. Dissolved air tank; 74. Main conveying pipe; 8. Branch conveying pipe; 9. Stirring mechanism; 10. Liquid inlet pipe; 11. Sludge scraping mechanism; 12. Sludge collection zone; 13. Clear water tank; 14. Air compressor; 15. Liquid guide pipe; 16. Water pump; 17. Pressurized water pump; 18. Electrical control box. Detailed Implementation

[0020] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the following description, in conjunction with specific illustrations, further elaborates on this utility model.

[0021] Reference Figures 1-4 As shown, a flotation device for wastewater treatment includes a flotation machine body 1. The flotation machine body 1 is provided with a flocculation zone 2, an aeration tank 3, and an impurity separation zone 4 in sequence along the direction of wastewater flow. Wastewater is introduced into the flocculation zone 2 through an inlet pipe 10. A stirring mechanism 9 is provided in the flocculation zone 2. Flocculant PAC and coagulant aid PAM are added to the flocculation zone 2. The stirring mechanism 9 stirs them with the wastewater to carry out an effective flocculation reaction. The raw water enters the aeration tank 3. Then, an aeration unit 7 is provided in the aeration tank 3. The aeration unit 7 can generate bubbles in the aeration tank 3. The bubbles attach to the flocculated suspended matter and enter the impurity separation zone 4 together. The overall density of the suspended matter with a large number of bubbles is less than 1. The flocs and bubbles rise to the liquid surface together to form scum, realizing solid-liquid separation. At the same time, a scum scraping mechanism 11 is provided on the impurity separation zone 4. The scum scraping mechanism 11 scrapes the scum and makes it enter the sludge collection zone 12 connected to the impurity separation zone 4. The clear water at the bottom flows into the clear water tank 13 by gravity.

[0022] In order to uniformly cover all pollutants and reduce the phenomenon of local enrichment or depletion of bubbles, thereby improving the efficiency of impurity separation, multiple baffles 5 are installed in the aeration tank 3. The multiple baffles 5 divide the aeration tank 3 into multiple aeration zones 6. Each aeration zone 6 is individually fluidly connected to the flocculation zone 2, which reduces the treatment range of a single area and reduces the complexity of water flow caused by the large area of ​​the aeration tank 3. At the same time, it shortens the diffusion path of bubbles in the aeration zone 6. Then, an aeration unit 7 is installed in each aeration zone 6 to avoid the formation of local depletion areas due to excessive diffusion distance of bubbles, reduce the impact of uneven bubble distribution, and effectively reduce local leakage.

[0023] Reference Figure 3 As shown, the aeration unit 7 further includes an aeration plate 71 with a hollow interior and multiple aeration heads 72 disposed on the aeration plate 71. The aeration heads 72 are connected to a delivery pipe 8 for conveying dissolved air water. The dissolved air water is a mixture of air and water and contains a large number of micro bubbles. The dissolved air water is conveyed into the aeration plate 71 through the delivery pipe 8 and flows out into each aeration zone 6 through the multiple aeration heads 72. The dissolved air water with bubbles releases a large number of bubbles and attaches to the flocs, causing the flocs to float and achieving solid-liquid separation.

[0024] The aeration unit 7 also includes a dissolved air tank 73 and a main delivery pipe 74 connected to the output end of the dissolved air tank 73. The output end of the main delivery pipe 74 is connected to the input ends of multiple delivery branch pipes 8. In order to generate dissolved air water, an air compressor 14 is installed to deliver air into the dissolved air tank 73. At the same time, part of the water in the clear water tank 13 is discharged, and part of the water is connected to a liquid guide pipe 15 in the clear water tank 13. The water pump 16 in the clear water tank 13 is pumped into the dissolved air tank 73, and the air and clear water are mixed under the action of the dissolved air tank 73 to form dissolved air water containing saturated air. The working principle of the dissolved air tank 73 is existing technology and will not be described in detail here, but should be known by those skilled in the art. Then, the dissolved air water in the dissolved air tank 73 is pressurized and released into the main delivery pipe 74 by the pressurized water pump 17 and flows into the delivery branch pipes 8. Finally, it is released into the aeration tank 3. All the above components are controlled by the electrical control box 18 to realize the automated management of equipment operation.

[0025] Reference Figure 3 As shown, the cross-sectional profile of the aeration plate 71 is the same as that of the aeration zone 6. For example, if the aeration zone 6 is circular, the aeration plate 71 is also circular; if the aeration tank 3 is rectangular, the aeration plate 71 is also rectangular. The same profile design can guide the sewage to form a streamline that matches the boundary in the aeration zone 6, reducing the local eddies or stagnant flow caused by the difference in the profile of the aeration plate 71 and the aeration zone 6. At the same time, it can make the bubbles released by the aeration head 72 evenly fill the entire space of the aeration zone 6, avoiding insufficient bubble coverage in the edge area due to the mismatch between the size or shape of the aeration plate 71 and the aeration zone 6. For example, when a circular aeration plate 71 is used in a rectangular aeration zone 6, aeration blind zones are easily formed at the four corners, ensuring that the sewage can fully contact the bubbles in all areas of the aeration zone 6.

[0026] Among them, the aeration heads 72 are arranged on the aeration plate 71 in a regular array that matches the shape of the aeration plate 71. The regular array ensures that the spacing between adjacent aeration heads 72 is constant, such as the equal angular interval of the circumferential array and the equal row and column spacing of the matrix array, so that the bubbles form a three-dimensional distribution field with uniform density in the aeration zone 6, avoiding local bubbles that are too dense or too sparse.

[0027] Reference Figure 3 As shown, the height of the baffle 5 is lower than the height of the wall of the aeration tank 3, and there is a gap between the top of the baffle 5 and the liquid surface of the aeration tank 3. The gap between the top of the baffle 5 and the liquid surface allows the water to flow freely on both sides of the baffle 5, preventing water accumulation on one side or a sudden drop in flow rate due to the complete blockage of the baffle 5, so that the water flow in the aeration tank 3 forms a circulating convection.

[0028] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A flotation device for wastewater treatment, comprising a flotation machine body (1), wherein the flotation machine body (1) is provided with a flocculation zone (2), an aeration tank (3), and an impurity separation zone (4) sequentially along the direction of wastewater flow, characterized in that, The aeration tank (3) is provided with multiple partitions (5) inside, which divide the aeration tank (3) into multiple aeration zones (6). Each aeration zone (6) is individually fluidly connected to the flocculation zone (2). The aeration zone (6) is provided with an aeration unit (7) for generating bubbles. The aeration zone (6) is used to shorten the diffusion path of bubbles within it, so as to avoid the formation of local shortage areas due to excessive diffusion distance of bubbles.

2. The air flotation device for wastewater treatment according to claim 1, characterized in that, The aeration unit (7) includes an internally hollow aeration plate (71) and multiple aeration heads (72) provided on the aeration plate (71). The aeration plate (71) is connected to a delivery pipe (8) for delivering dissolved air water.

3. The air flotation device for wastewater treatment according to claim 2, characterized in that, The aeration unit (7) also includes a dissolved gas tank (73) and a conveying main pipe (74) connected to the output end of the dissolved gas tank (73). The output end of the conveying main pipe (74) is connected to the input end of a plurality of conveying branch pipes (8).

4. The air flotation device for wastewater treatment according to claim 2, characterized in that, The cross-sectional profile of the aeration plate (71) is the same as that of the aeration zone (6).

5. The air flotation device for wastewater treatment according to claim 1, characterized in that, The height of the partition (5) is lower than the height of the aeration tank (3) wall, and there is a gap between the top of the partition (5) and the liquid surface of the aeration tank (3).

6. The air flotation device for wastewater treatment according to claim 2, characterized in that, The multiple aeration heads (72) are arranged in a regular array on the aeration plate (71) that matches the shape of the aeration plate (71).

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