Aeration device and sewage treatment system with same

Abstract

The utility model relates to the technical field of sewage treatment, and provides an aeration device and a sewage treatment system with the aeration device, and the aeration device comprises an aerator which is arranged in an aerobic tank needing aeration; the premixing cover is arranged at the air outlet end of the aerator in a covering mode, and a first premixing area is formed in the space between the premixing cover and the aerator; a gap is reserved between the premixing cover and the aerator to form a first water return port, and the first water return port is communicated with the first premixing area and a space outside the first premixing area; wherein the flow area of the release port of the premixing cover is smaller than that of the water inlet of the premixing cover, so that the pressure in the first premixing area is increased in an aeration state. According to the aeration device provided by the utility model, when the aeration device is used, the concentration of dissolved oxygen is improved by refluxing, mixing and pressurizing dissolved gas, and the aeration device is higher in efficiency and more energy-saving under the same aeration condition.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to an aeration device and a sewage treatment system having the same. Background Art

[0002] In the water treatment process, aeration equipment is a key equipment for biological pretreatment of water and biological treatment of sewage. Its function is to take certain technical measures to transfer oxygen in the air to the liquid in the aeration tank through the aeration device to supply the oxygen required for aerobic biological metabolism, and at the same time fully and evenly mix the water in the tank to achieve the purpose of biological treatment. When the aeration device in the prior art is in use, air escapes from the aerator in the form of tiny bubbles and diffuses in the mixed liquid, so that the oxygen in the bubbles is transferred to the mixed liquid. At the same time, the bubbles strongly diffuse and stir in the mixed liquid, so that the mixed liquid is in a state of intense mixing and stirring. However, after the gas of such an aeration device escapes from the aerator, it moves directly toward the liquid surface, and the gas-water mixed liquid has a short extension, resulting in a low concentration of dissolved oxygen and an unsatisfactory mixing effect. Utility Model Content

[0003] Therefore, the technical problem to be solved by the utility model is that after the gas in the traditional aeration device escapes from the aerator, it moves directly toward the liquid surface, and the gas-water mixed liquid has a short extension, resulting in a low dissolved oxygen concentration and an unsatisfactory mixing effect, thereby providing an aeration device and a sewage treatment system having the same.

[0004] In order to solve the above technical problems, the technical solution of the utility model is as follows:

[0005] In one aspect, the utility model provides an aeration device, comprising:

[0006] Aerator, used to be set in an aerobic pool that needs aeration;

[0007] A premixing hood is arranged at the air outlet end of the aerator, and the space between the premixing hood and the aerator forms a first premixing zone; a gap is left between the premixing hood and the aerator to form a first water return port, and the first water return port connects the first premixing zone with the space outside the first premixing zone; wherein the flow area of ​​the release port of the premixing hood is smaller than the flow area of ​​the water inlet of the premixing hood, so as to increase the pressure in the first premixing zone under the aeration state.

[0008] Furthermore, the aeration device further comprises a fairing, which is arranged at the release port of the premixing hood, the end of the fairing away from the premixing hood is a sealing structure, and the inner diameter of the fairing gradually decreases in the direction away from the premixing hood;

[0009] The space between the fairing and the premixing cover forms a second premixing zone;

[0010] A gap is left between the fairing and the premixing cover to form a diversion port, and the diversion port connects the second premixing zone with the space outside the second premixing zone. The gas-water mixture in the second premixing zone is divided into a first branch and a second branch after flowing out through the diversion port. The gas-water mixture in the first branch moves toward the first water return port, and the gas-water mixture in the second branch flows over the fairing toward the downstream.

[0011] Furthermore, a plurality of tooth-shaped openings are arranged at the edge of the fairing opening, and the plurality of tooth-shaped openings are distributed along the circumference of the fairing.

[0012] Furthermore, the aeration device further comprises a speed-retaining member, which is arranged between the premixing hood and the fairing, and one end of the speed-retaining member away from the fairing is connected to a release port of the premixing hood.

[0013] Furthermore, the aeration device also includes a baffle plate, which is arranged inside the fairing, and the plate surface of the baffle plate is arranged facing the outlet of the speed-retaining component.

[0014] Furthermore, the aeration device further comprises a speed-maintaining member, which is arranged between the premixing hood and the aerator;

[0015] A gap is left between the speed-retaining component and the premixing cover to form the first water return port.

[0016] Furthermore, the aeration device also includes an outer cylinder, which is used to be arranged in an aerobic pool requiring aeration;

[0017] The aerator, the speed-retaining member and the premixing cover are all located in the outer cylinder, and the gas-water mixture flowing out from the release port of the premixing cover flows out through the open port at the top of the outer cylinder;

[0018] A gap is left between the bottom of the outer cylinder and the aerator to form a second water return port, so that the air-water mixture outside the outer cylinder enters the speed-retaining component through the second water return port.

[0019] Furthermore, the aeration device further comprises a speed-retaining member; one end of the speed-retaining member is connected to the release port of the premixing hood, and the other end of the speed-retaining member extends in a direction away from the premixing hood.

[0020] Furthermore, the aeration device further comprises a throat pipe, which is disposed above the speed-retaining member;

[0021] The diameters of the two ends of the throat pipe are larger than the diameter of the middle section of the pipe body, and a gap is left between the throat pipe and the speed-retaining component to form a second water return port.

[0022] Furthermore, the aerators are arranged in a point shape or a strip shape in the aerobic tank.

[0023] On the other hand, the utility model further provides a sewage treatment system, comprising the aeration device described in any one of the above items, and also comprising an aerobic tank, wherein the aeration device is arranged in the aerobic tank.

[0024] The technical solution of the utility model has the following advantages:

[0025] The aeration device provided by the utility model has an aerator that releases air in the first premixing zone. As the bubbles rise rapidly, the water outside the first premixing zone is driven to enter the first premixing zone through the first water return port. In addition, the release port just above the premixing hood is reduced in diameter so that the pressure in the first premixing zone increases, so that the bubbles are further mixed with the water that flows back through the first water return port. Due to the increase in pressure, the effect of gas dissolving into water is better. The mixed gas-water mixture is ejected through the release port and rises to the aerobic area outside the first premixing zone. With such an arrangement, when the aeration device is in use, the concentration of dissolved oxygen is increased by reflowing, mixing and pressurizing dissolved gas. Under the same aeration conditions, the efficiency is higher and more energy-saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 It is a schematic diagram of an aeration device in one embodiment of the utility model;

[0028] Figure 2 is a schematic diagram of an aeration device in another embodiment of the utility model;

[0029] Figure 3 is a schematic diagram of an aeration device in another embodiment of the utility model;

[0030] Figure 4 is a schematic diagram of an aeration device in another embodiment of the utility model;

[0031] Figure 5 This is a schematic diagram of an aerator in an aeration device in an embodiment of the utility model when it is arranged in a strip shape;

[0032] Figure 6 This is a schematic diagram of an aeration device in an embodiment of the utility model when the aerators are arranged in a dotted manner;

[0033] Figure 7is a schematic diagram of an aeration device in another embodiment of the utility model;

[0034] Figure 8 is a schematic diagram of an aeration device in another embodiment of the utility model;

[0035] Fig. 9 is a schematic diagram of an aeration device in another embodiment of the utility model;

[0036] Fig.10 This is a schematic diagram of an aeration device in yet another embodiment of the utility model.

[0037] Description of reference numerals:

[0038] 1. Aerator; 2. Premixing hood; 3. First premixing zone; 4. First water return port; 5. Fairing; 6. Second premixing zone; 7. Second water return port; 8. Speed-retaining part; 9. Baffle; 10. Toothed port; 11. Outer cylinder; 12. Throat. DETAILED DESCRIPTION

[0039] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0040] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0041] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0043] like Figure 1 , Figure 5 as well as Figure 6 As shown, this embodiment provides an aeration device, including: an aerator 1, which is used to be arranged in an aerobic tank that needs aeration; wherein, a plurality of aerators 1 can be provided, and the aerators 1 can be arranged in a point-like manner in the aerobic tank, for example, a plurality of aerators 1 arranged in a point-like manner can be arranged in a ring. The aerator 1 can also be arranged in a strip-like manner in the aerobic tank, for example, a plurality of aerators 1 can be arranged in an array in rows or columns. The arrangement of the aerator 1 is not limited to the above two methods, and the actual arrangement of the aerator 1 can be designed as needed. The premixing hood 2 is arranged at the outlet end of the aerator 1, and the space between the premixing hood 2 and the aerator 1 forms the first premixing zone 3; a gap is left between the premixing hood 2 and the aerator 1 to form the first water return port 4, and the first water return port 4 connects the first premixing zone 3 with the space outside the first premixing zone 3; wherein the flow area of ​​the release port of the premixing hood 2 is smaller than the flow area of ​​the water inlet of the premixing hood 2, so as to increase the pressure in the first premixing zone 3 under the aeration state. For example, the premixing hood 2 can be a truncated cone structure, with both ends open, the large end at the bottom, the small end at the top, and the small end used as a release port. For another example, the premixing hood 2 can also be a prism structure, with both ends open, the large end at the bottom, the small end at the top, and the small end used as a release port. wherein the premixing hood 2 can be welded to the side wall of the aerobic tank by setting a connecting rod on the side wall; or it can be installed as an integrated structure with the air pipe bracket of the aerator and fixed on the air pipe bracket of the aerator.

[0044] In the aeration device provided in this embodiment, the aerator 1 releases air in the first premixing zone 3. Due to the rapid rise of bubbles, the water outside the first premixing zone 3 will be driven to enter the first premixing zone 3 through the first water return port 4. In addition, the release port just above the premixing cover 2 is reduced in diameter so that the pressure in the first premixing zone 3 increases, so that the bubbles are further mixed with the water flowing back through the first water return port 4, and the mixing effect will be better due to the increase in pressure. The mixed gas-water mixture is ejected through the release port and rises to the aerobic area outside the first premixing zone 3. With such a configuration, when the aeration device is in use, the concentration of dissolved oxygen is increased by reflowing, mixing and pressurizing dissolved gas, and the efficiency is higher and more energy-saving under the same aeration conditions.

[0045] like Figure 2As shown, the aeration device further comprises a fairing 5, which is arranged at the release port of the premixing hood 2, and the end of the fairing 5 away from the premixing hood 2 is a sealing structure, and the inner diameter of the fairing 5 gradually decreases in the direction away from the premixing hood 2; the space between the fairing 5 and the premixing hood 2 forms a second premixing zone 6; a gap is left between the fairing 5 and the premixing hood 2 to form a diversion port, and the diversion port connects the second premixing zone 6 with the space outside the second premixing zone 6. Wherein, the fairing 5 can be welded to the side wall of the aerobic tank by arranging a connecting rod on the side wall. For example, the fairing 5 can be a conical structure with the top of the cone on the top. For another example, the premixing hood 2 can also be a prismatic structure with a smaller top surface on the top. Wherein, the shape of the fairing 5 is adapted to the shape of the premixing hood 2, for example, when the premixing hood 2 is a truncated cone structure, the fairing 5 can be a conical structure. For example, when the premixing hood 2 is a prism structure, the fairing 5 can be a prismatic structure. When in use, the gas-water mixture in the first premixing zone 3 enters the second premixing zone 6 through the release port of the premixing cover 2, and the gas-water mixture in the second premixing zone 6 flows out through the diversion port and is divided into a first branch and a second branch. The gas-water mixture in the first branch moves toward the first water return port 4, thereby forming a cycle, and the gas-water mixture in the second branch flows toward the downstream over the fairing 5. Moreover, since the side wall of the fairing 5 is an inclined surface, a slope can be formed, and a part of the gas-water mixture will slide down along the slope and counter-mix with the rapidly rising gas-water mixture in the second branch, thereby improving the mixing effect.

[0046] like Figure 6 As shown, a plurality of tooth-shaped openings 10 can be provided at the edge of the fairing 5, and the plurality of tooth-shaped openings 10 are distributed along the circumference of the fairing 5. Such a setting has two advantages: first, the tooth-shaped openings 10 can increase the mixing effect, because the flow velocities of the concave area and the convex area through the tooth-shaped openings 10 are different, which can increase the disturbance mixing effect; second, it has the function of cutting bubbles, which can make large bubbles become smaller bubbles, increase the contact area of ​​water, and increase dissolved oxygen. In addition, the gas-water mixture has a horizontal and downward reflux diversion momentum, which can further increase the mixing effect, and the downward diversion of the gas-water mixture will increase the mixing extension, prolong the effective contact time, and will not directly rise to the liquid surface.

[0047] like Figure 3As shown, in one embodiment, the aeration device further includes a speed-keeping component 8, which is disposed between the premixing hood 2 and the fairing 5, and one end of the speed-keeping component 8 away from the fairing 5 is connected to the release port of the premixing hood 2. For example, when the premixing hood 2 is a truncated cone structure, the speed-keeping component 8 may be a round tube. When the premixing hood 2 is a prism-shaped structure, the speed-keeping component 8 may be a square tube, so as to match the shape of the premixing hood 2. When in use, the gas-water mixture flowing out of the release port of the premixing hood 2 can enter the speed-keeping component 8, and the speed of the gas-water mixture in the speed-keeping component 8 changes little, and a high flow rate can be maintained, and then it is released from the top outlet of the speed-keeping component 8 to the second premixing zone 6. In this arrangement, a section of the speed-keeping component 8 is added to the release port of the premixing hood 2, and this straight speed-keeping component 8 can keep the drainage force of the first premixing zone 3 relatively large. Because the speed-retaining component 8 increases the height of the release port of the premixing hood 2, the flow velocity of the gas-water mixture outside the premixing hood 2 is relatively low, and the speed difference with the gas-water mixture in the first premixing zone 3 is relatively large, so the pressure difference is large. Compared with the case without the speed-retaining component 8, the speed difference between the two is greater, so the drainage effect is better.

[0048] like Figure 4 The aeration device further comprises a baffle 9, which is arranged inside the fairing 5, and the plate surface of the baffle 9 is arranged opposite to the outlet of the speed-retaining member 8. When in use, the gas-water mixture released from the outlet at the top of the speed-retaining member 8 hits the baffle 9 and then diffuses to the surroundings. Such arrangement can prevent the accumulation of gas bubbles on the top of the fairing 5, so that the gas is smoothly released into the water, thereby improving the gas-water mixing effect.

[0049] like Figure 7 As shown, in another embodiment, the aeration device further includes a speed-retaining member 8, which is arranged between the premixing hood 2 and the aerator 1; a gap is left between the speed-retaining member 8 and the premixing hood 2 to form a first water return port 4. Such an arrangement can accelerate the water body to enter the first premixing zone 3 through the first water return port 4. The speed-retaining member 8 can be a round tube or a square tube, which can be selected according to needs.

[0050] Among them, the aeration device also includes an outer cylinder 11, which is used to be set in an aerobic pool that needs aeration; the aerator 1, the speed-retaining component 8 and the premixing hood 2 are all located in the outer cylinder 11, and the gas-water mixture flowing out from the release port of the premixing hood 2 flows out through the open port at the top of the outer cylinder 11; a gap is left between the bottom of the outer cylinder 11 and the aerator 1 to form a second water return port 7, so that the gas-water mixture outside the outer cylinder 11 enters the speed-retaining component 8 through the second water return port 7. Among them, the outer cylinder 11 can be a round tube or a square tube, which can be selected according to needs. Such a setting increases the number of reflux times, which is equivalent to secondary reflux mixing, which is beneficial to improving the gas-water mixing effect.

[0051] like Fig.10As shown, in another embodiment, the aeration device further includes a speed-retaining member 8 ; one end of the speed-retaining member 8 is connected to the release port of the premixing hood 2 , and the other end extends in a direction away from the premixing hood 2 .

[0052] like Figure 8 , Fig. 9 As shown, in another embodiment, the aeration device further includes a speed-retaining component 8 and a throat 12; from top to bottom, they are the throat 12, the speed-retaining component 8, the premixing hood 2 and the aerator 1. One end of the speed-retaining component 8 is connected to the release port of the premixing hood 2, and the other end extends upward into the throat 12; the diameter of both ends of the throat 12 is larger than the diameter of the middle section of the pipe body, and a gap is left between the throat 12 and the speed-retaining component 8 to form a second water return port. When in use, the speed-retaining component 8 is used to achieve the first-level speed retention, and the throat 12 is used to achieve the second-level speed retention. This arrangement increases the number of reflux times, which is equivalent to the second-level reflux mixing, and is beneficial to improving the gas-water mixing effect. Among them, in the aeration device under this embodiment, the aerator 1 is selected to be arranged in a point shape.

[0053] In another embodiment, a sewage treatment system is provided, comprising any one of the aeration devices described above, and further comprising an aerobic tank, wherein the aeration device is disposed in the aerobic tank.

[0054] In summary, the aeration device in the present application and the sewage treatment system having the same have reflux, mixing, and pressurized dissolved gas, which increase the concentration of dissolved oxygen. Under the same aeration conditions, the efficiency is improved and more energy-saving is achieved.

[0055] The aeration device in the present application and the sewage treatment system having the same have multiple flow patterns such as horizontal flow, vertical flow, and circulating flow, which increase the extension distance, prolong the reaction time, and increase the concentration of dissolved oxygen. Under the same aeration conditions, the efficiency is improved and more energy-saving is achieved.

[0056] The aeration device and the sewage treatment system having the same in the present application utilize the air lift drainage effect to enable the reflux mixing to play a role under the same aeration conditions, which is more energy-efficient.

[0057] The aeration device in the present application and the sewage treatment system having the same have an ascending flow velocity variable effect that causes particle collision and better mixing effect, and aerobic particles are more easily wrapped and scrubbed to form.

[0058] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. An aeration device, characterized in that: include: An aerator (1) is used to be arranged in an aerobic pool that needs aeration; A premixing hood (2) is arranged at the air outlet end of the aerator (1), and the space between the premixing hood (2) and the aerator (1) forms a first premixing zone (3); a gap is left between the premixing hood (2) and the aerator (1) to form a first water return port (4), and the first water return port (4) communicates with the first premixing zone (3) and the space outside the first premixing zone (3).

2. The aeration device according to claim 1, characterized in that: It also comprises a fairing (5) which is arranged at the release port of the premixing cover (2), the end of the fairing (5) away from the premixing cover (2) is a sealing structure, and the inner diameter of the fairing (5) gradually decreases in a direction away from the premixing cover (2); The space between the fairing (5) and the premixing cover (2) forms a second premixing zone (6); A gap is left between the fairing (5) and the premixing cover (2) to form a diversion port, and the diversion port communicates with the second premixing zone (6) and the space outside the second premixing zone (6).

3. The aeration device according to claim 2, characterized in that: A plurality of tooth-shaped openings (10) are arranged at the edge of the fairing opening of the fairing (5), and the plurality of tooth-shaped openings (10) are distributed along the circumference of the fairing (5).

4. The aeration device according to claim 3, characterized in that: It also comprises a speed-retaining component (8) which is arranged between the premixing cover (2) and the fairing (5), and one end of the speed-retaining component (8) away from the fairing (5) is connected to the release port of the premixing cover (2).

5. The aeration device according to claim 4, characterized in that: It also includes a baffle (9) which is arranged inside the fairing (5), and the plate surface of the baffle (9) is arranged facing the outlet of the speed-retaining component (8).

6. The aeration device according to claim 1, characterized in that: It also includes a speed-maintaining component (8) disposed between the premixing cover (2) and the aerator (1); A gap is left between the speed-retaining component (8) and the premixing cover (2) to form the first water return port (4).

7. The aeration device according to claim 6, characterized in that: It also includes an outer cylinder (11) for being arranged in an aerobic pool requiring aeration; The aerator (1), the speed-retaining component (8) and the premixing cover (2) are all located in the outer cylinder (11), and the gas-water mixture flowing out from the release port of the premixing cover (2) flows out through the open port at the top of the outer cylinder (11); A gap is left between the bottom of the outer cylinder (11) and the aerator (1) to form a second water return port (7), so that the gas-water mixture outside the outer cylinder (11) enters the speed-retaining component (8) through the second water return port (7).

8. The aeration device according to claim 1, characterized in that: Also includes a speed-retaining member (8); One end of the speed-retaining member (8) is connected to the release port of the premixing cover (2), and the other end extends in a direction away from the premixing cover (2).

9. The aeration device according to claim 8, characterized in that: It also includes a throat (12) which is arranged above the speed-retaining member (8); The diameters of the two ends of the throat pipe (12) are larger than the diameter of the middle pipe body, and a gap is left between the throat pipe (12) and the speed-retaining component (8) to form a second water return port.

10. The aeration device according to claim 1, characterized in that: The aerator (1) is arranged in a point shape or a strip shape in the aerobic tank.

11. A sewage treatment system, characterized in that: The invention comprises the aeration device according to any one of claims 1 to 10, and further comprises an aerobic tank, wherein the aeration device is arranged in the aerobic tank.

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