Aeration device and sewage treatment system with same

Abstract

The present invention relates to the technical field of sewage treatment, and provides an aeration apparatus and a sewage treatment system having the same, the aeration apparatus comprises: an aerator 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 invention, 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] This invention relates to the field of wastewater treatment technology, specifically to an aeration device and a wastewater treatment system having the same. Background Technology

[0002] In water treatment processes, aeration equipment is a key component in biological pretreatment of water supply and biological treatment of wastewater. Its function is to transfer oxygen from the air into the liquid of the aeration tank through specific technical measures, supplying the oxygen needed for aerobic biological metabolism, while simultaneously ensuring thorough and uniform mixing of the water in the tank to achieve the purpose of biological treatment. In existing aeration devices, air escapes from the aerator in the form of tiny bubbles and diffuses in the mixed liquid, transferring oxygen from the bubbles into the liquid. Simultaneously, the bubbles strongly diffuse and agitate the mixture, creating a vigorous mixing and stirring state. However, in such aeration devices, the gas escapes directly towards the liquid surface after exiting the aerator, resulting in a short air-water mixing distance, leading to low dissolved oxygen concentration and unsatisfactory mixing effect. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present invention is that in traditional aeration devices, after the gas escapes from the aerator, it moves directly towards the liquid surface, resulting in a short gas-water mixture distance, which leads to a low dissolved oxygen concentration and an unsatisfactory mixing effect. The present invention provides an aeration device and a wastewater treatment system having the same.

[0004] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows:

[0005] On one hand, the present invention provides an aeration device, comprising:

[0006] Aerators are used to be installed in aerobic tanks that require aeration.

[0007] A premixing hood is installed over the air outlet 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 return water inlet, which connects the first premixing zone to 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 inlet of the premixing hood, so as to increase the pressure in the first premixing zone under aeration conditions.

[0008] Furthermore, the aeration device also includes a shroud covering the release port of the premixing shroud. The end of the shroud away from the premixing shroud is a sealed structure, and the inner diameter of the shroud gradually decreases in the direction away from the premixing shroud.

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

[0010] A gap is left between the rectifier and the premixing hood to form a diversion port. 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 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 return water port, and the gas-water mixture in the second branch flows over the rectifier and moves downstream.

[0011] Furthermore, the fairing has a plurality of toothed openings along its circumferential edge.

[0012] Furthermore, the aeration device also includes a speed-maintaining component disposed between the premixing hood and the rectifier hood, and the end of the speed-maintaining component away from the rectifier hood is connected to the release port of the premixing hood.

[0013] Furthermore, the aeration device also includes a baffle plate disposed inside the shroud, with the baffle plate surface facing the outlet of the speed-maintaining component.

[0014] Furthermore, the aeration device also includes a speed-maintaining component disposed between the premix hood and the aerator;

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

[0016] Furthermore, the aeration device also includes an outer cylinder for installation inside the aerobic tank that requires aeration;

[0017] The aerator, the speed-maintaining component, and the premixing hood are all located inside the outer cylinder. The gas-water mixture flowing out from the release port of the premixing hood flows out through the opening 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 return water inlet, so that the air-water mixture outside the outer cylinder can enter the retaining component through the second return water inlet.

[0019] Furthermore, the aeration device also includes a speed-maintaining component; one end of the speed-maintaining component is connected to the release port of the premixing hood, and the other end extends in a direction away from the premixing hood.

[0020] Furthermore, the aeration device also includes a throat pipe, which is positioned above the retaining element;

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

[0022] Furthermore, the aerators are arranged in a dotted or striped pattern within the aerobic tank.

[0023] On the other hand, the present invention also provides a wastewater treatment system, including the aeration device described in any one of the above, and further including an aerobic tank, wherein the aeration device is disposed in the aerobic tank.

[0024] The technical solution of this invention has the following advantages:

[0025] The aeration device provided by this invention releases air in the first premixing zone. Due to the rapid rise of the bubbles, water from outside the first premixing zone enters through the first return inlet. Furthermore, the narrowed diameter of the release port directly above the premixing hood increases the pressure in the first premixing zone, allowing the bubbles to mix further with the water returning through the first return inlet. The increased pressure also improves the dissolution of the gas into the water. The resulting air-water mixture is then sprayed out through the release port and rises to the aerobic area outside the first premixing zone. This design allows the aeration device to increase dissolved oxygen concentration through gas recirculation, mixing, and pressurization during operation, resulting in higher efficiency and greater energy savings under the same aeration conditions. Attached Figure Description

[0026] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of an aeration device according to one embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of an aeration device in another embodiment of the present invention;

[0029] Figure 3 This is a schematic diagram of an aeration device in another embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram of an aeration device in another embodiment of the present invention;

[0031] Figure 5 This is a schematic diagram of the aeration device in one embodiment of the present invention, in which the aerators are arranged in a strip shape.

[0032] Figure 6 This is a schematic diagram of an aeration device in an embodiment of the present invention, in which the aerators are arranged in a dotted pattern.

[0033] Figure 7 This is a schematic diagram of an aeration device in another embodiment of the present invention;

[0034] Figure 8 This is a schematic diagram of an aeration device in another embodiment of the present invention;

[0035] Figure 9 This is a schematic diagram of an aeration device in another embodiment of the present invention;

[0036] Figure 10 This is a schematic diagram of an aeration device in another embodiment of the present invention.

[0037] Explanation of reference numerals in the attached figures:

[0038] 1. Aerator; 2. Premixing hood; 3. First premixing zone; 4. First return water inlet; 5. Rectifier hood; 6. Second premixing zone; 7. Second return water inlet; 8. Speed-maintaining component; 9. Baffle; 10. Toothed inlet; 11. Outer cylinder; 12. Throat pipe. Detailed Implementation

[0039] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0041] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0042] Furthermore, 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, used to be installed in an aerobic tank requiring aeration; wherein, multiple aerators 1 can be installed, and the aerators 1 can be arranged in a point pattern in the aerobic tank, for example, multiple point-arranged aerators 1 can be arranged in a ring. The aerators 1 can also be arranged in a strip pattern in the aerobic tank, for example, multiple aerators 1 can be arranged in a row or column array. The arrangement of the aerators 1 is not limited to the above two methods, and the actual arrangement of the aerators 1 can be designed according to needs. A premixing hood 2 is installed over the air outlet 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 return water inlet 4, which connects the first premixing zone 3 to the space outside the first premixing zone 3. The flow area of ​​the release port of the premixing hood 2 is smaller than the flow area of ​​the inlet of the premixing hood 2, so as to increase the pressure within the first premixing zone 3 under aeration conditions. For example, the premixing hood 2 can be a frustum-shaped structure with open ends, the larger end at the bottom and the smaller end at the top, with the smaller end used as the release port. Alternatively, the premixing hood 2 can also be a frustum-shaped structure with open ends, the larger end at the bottom and the smaller end at the top, with the smaller end used as the release port. The premixing hood 2 can be welded to the side wall of the aerobic tank by a connecting rod; or it can be installed as an integral structure with the aerator's air pipe support and fixed to the aerator's air pipe support.

[0044] The aeration device provided in this embodiment releases air from the aerator 1 in the first premixing zone 3. Due to the rapid rise of the bubbles, water from outside the first premixing zone 3 is drawn into it through the first return water inlet 4. Furthermore, the narrowing of the release port directly above the premixing hood 2 increases the pressure in the first premixing zone 3, further mixing the bubbles with the water returning through the first return water inlet 4. The increased pressure further enhances the mixing effect. The resulting air-water mixture is then sprayed out through the release port and rises to the aerobic area outside the first premixing zone 3. This configuration allows the aeration device to increase dissolved oxygen concentration through reflux, mixing, and pressurization of dissolved gases during use, resulting in higher efficiency and greater energy savings under the same aeration conditions.

[0045] like Figure 2As shown, the aeration device also includes a rectifier 5, which covers the release port of the premixing hood 2. The end of the rectifier 5 away from the premixing hood 2 is sealed, and the inner diameter of the rectifier 5 gradually decreases in the direction away from the premixing hood 2. The space between the rectifier 5 and the premixing hood 2 forms a second premixing zone 6. A gap is left between the rectifier 5 and the premixing hood 2 to form a diversion port, which connects the second premixing zone 6 to the space outside the second premixing zone 6. The rectifier 5 can be welded to the side wall of the aerobic tank by means of connecting rods on the side wall. For example, the rectifier 5 can be a conical structure with the cone apex at the top. As another example, the premixing hood 2 can also be a prismatic structure with the smaller top surface at the top. The shape of the rectifier 5 is adapted to the shape of the premixing hood 2. For example, when the premixing hood 2 is a frustum-shaped structure, the rectifier 5 can be a conical structure. For example, when the premixing hood 2 is a frustum-shaped structure, the rectifier 5 can be a prismatic structure. 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 hood 2. The gas-water mixture in the second premixing zone 6 flows out through the branch port and splits into a first branch and a second branch. The gas-water mixture in the first branch moves towards the first return port 4, thus forming a circulation. The gas-water mixture in the second branch flows downstream over the rectifier hood 5. Furthermore, because the sidewall of the rectifier hood 5 is inclined, it forms a slope. A portion of the gas-water mixture slides down the slope, colliding and mixing with the rapidly rising gas-water mixture in the second branch, thereby improving the mixing effect.

[0046] like Figure 6 As shown, the edge of the fairing 5 can be provided with several toothed orifices 10, which are distributed circumferentially along the fairing 5. This arrangement has two advantages: first, the toothed orifices 10 can enhance the mixing effect because the flow velocities in the concave and convex areas of the toothed orifices 10 are different, which can increase the turbulent mixing effect; second, it has the function of cutting bubbles, which can break large bubbles into smaller bubbles, increasing the contact area with water and increasing dissolved oxygen. In addition, the horizontal and downward backflow of the gas-water mixture can further enhance the mixing effect, and the downward splitting of the gas-water mixture will increase the mixing distance, prolong the effective contact time, and prevent it from rising directly to the liquid surface.

[0047] like Figure 3As shown, in one embodiment, the aeration device further includes a flow retainer 8, disposed between the premixing hood 2 and the rectifier hood 5, with the end of the flow retainer 8 away from the rectifier hood 5 connected to the release port of the premixing hood 2. For example, when the premixing hood 2 has a frustum-shaped structure, the flow retainer 8 can be a circular tube. When the premixing hood 2 has a frustum-shaped structure, the flow retainer 8 can be a square tube, thus adapting to the shape of the premixing hood 2. In use, the air-water mixture flowing out of the release port of the premixing hood 2 can enter the flow retainer 8. Within the flow retainer 8, the velocity change of the air-water mixture is small, maintaining a high flow rate, and then it is released from the top outlet of the flow retainer 8 to the second premixing zone 6. With this configuration, adding a section of flow retainer 8 at the release port of the premixing hood 2, this straight flow retainer 8 can maintain a large guiding force in the first premixing zone 3. Because the speed-maintaining component 8 increases the height of the release port of the premixing hood 2, the flow rate of the gas-water mixture outside the premixing hood 2 is relatively low, and the speed difference between it and the gas-water mixture in the first premixing zone 3 is relatively large, so the pressure difference is large. Compared with the absence of the speed-maintaining component 8, the speed difference between the two is even greater, so the diversion effect is better.

[0048] like Figure 4 The aeration device further includes a baffle 9, which is disposed inside the shroud 5, with the baffle 9 facing the outlet of the retaining element 8. During use, the gas-water mixture released from the outlet at the top of the retaining element 8 impacts the baffle 9 and then diffuses outwards. This arrangement prevents air from accumulating at the top of the shroud 5, thus preventing bubble aggregation and ensuring smooth gas release 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 component 8, disposed between the premixing hood 2 and the aerator 1; a gap is left between the speed-retaining component 8 and the premixing hood 2 to form a first return water inlet 4. This arrangement accelerates the flow of water through the first return water inlet 4 into the first premixing zone 3. The speed-retaining component 8 can be a round pipe or a square pipe, whichever is required.

[0050] The aeration device includes an outer cylinder 11, which is installed inside the aerobic tank requiring aeration. The aerator 1, the flow retainer 8, and the premixing hood 2 are all located inside the outer cylinder 11. The air-water mixture flowing from the release port of the premixing hood 2 flows out through the opening 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 return port 7, allowing the air-water mixture outside the outer cylinder 11 to enter the flow retainer 8 through the second return port 7. The outer cylinder 11 can be a round or square tube, depending on the requirements. This configuration increases the number of return cycles, equivalent to two-stage return mixing, which improves the air-water mixing effect.

[0051] like Figure 10As shown, in another embodiment, the aeration device further includes a speed-maintaining component 8; one end of the speed-maintaining component 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 , Figure 9 As shown, in another embodiment, the aeration device further includes a speed-maintaining component 8 and a throat 12; from top to bottom, the components are the throat 12, the speed-maintaining component 8, the premixing hood 2, and the aerator 1. One end of the speed-maintaining component 8 is connected to the release port of the premixing hood 2, and the other end extends upward into the throat 12. The diameters of both ends of the throat 12 are larger than the diameter of the middle section of the pipe, and a gap is left between the throat 12 and the speed-maintaining component 8 to form a second return water inlet. In use, the speed-maintaining component 8 is used to achieve primary speed maintenance, and the throat 12 is used to achieve secondary speed maintenance. This arrangement increases the number of return flows, which is equivalent to secondary return mixing, thus improving the air-water mixing effect. In this embodiment, the aerator 1 is arranged in a point-like pattern.

[0053] In another embodiment, a wastewater treatment system is provided, including an aeration device of any of the above, and further including an aerobic tank, wherein the aeration device is disposed in the aerobic tank.

[0054] In summary, the aeration device and wastewater treatment system described in this application have reflux, mixing, and pressurized dissolved gas, which increases the dissolved oxygen concentration. Under the same aeration conditions, the efficiency is improved and energy saving is greater.

[0055] The aeration device and wastewater treatment system described in this application have multiple flow patterns, including horizontal flow, vertical flow, and circulating flow. This increases the flow range, prolongs the reaction time, and improves the dissolved oxygen concentration. Under the same aeration conditions, the efficiency is improved, resulting in greater energy savings.

[0056] The aeration device and wastewater treatment system described in this application, under the same aeration conditions, utilize airlift and diversion to enable reflux mixing, resulting in greater energy savings.

[0057] The aeration device and wastewater treatment system described in this application have an upward flow velocity variation effect that improves particle collision and mixing, and makes it easier for aerobic particles to be coated and scrubbed together.

[0058] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. An aeration device, characterized in that, include: Aerator (1), used to be installed in the aerobic tank that requires aeration; A premixing hood (2) is installed over the air outlet of the aerator (1). 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 return water inlet (4). The first return water inlet (4) connects the first premixing zone (3) with the space outside the first premixing zone (3). The flow area of ​​the release port of the premixing hood (2) is smaller than the flow area of ​​the inlet of the premixing hood (2) to increase the pressure in the first premixing zone (3) under aeration conditions.

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

3. The aeration device according to claim 2, characterized in that, The fairing (5) has a plurality of toothed openings (10) along its edge, and the plurality of toothed openings (10) are distributed circumferentially along the fairing (5).

4. The aeration device according to claim 3, characterized in that, It also includes a speed-maintaining component (8), which is disposed between the premixed cover (2) and the fairing (5), and the end of the speed-maintaining component (8) away from the fairing (5) is connected to the release port of the premixed cover (2).

5. The aeration device according to claim 4, characterized in that, It also includes a baffle (9) disposed inside the fairing (5), with the baffle (9) facing the outlet of the speed-maintaining component (8).

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

7. The aeration device according to claim 6, characterized in that, It also includes an outer cylinder (11) for installation in the aerobic tank that requires aeration; The aerator (1), the speed-maintaining component (8) and the premixing hood (2) are all located inside the outer cylinder (11). The gas-water mixture flowing out from the release port of the premixing hood (2) flows out through the opening 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 return water port (7), so that the air-water mixture outside the outer cylinder (11) enters the retaining component (8) through the second return water port (7).

8. The aeration device according to claim 1, characterized in that, It also includes speed protection components (8); One end of the speed-maintaining component (8) is connected to the release port of the premixed cover (2), and the other end extends in a direction away from the premixed cover (2).

9. The aeration device according to claim 8, characterized in that, It also includes a throat tube (12), which is placed above the speed-maintaining component (8); The diameter of the two ends of the throat (12) is larger than the diameter of the middle section of the pipe. There is a gap between the throat (12) and the retaining component (8) to form a second return water port.

10. The aeration device according to claim 1, characterized in that, The aerators (1) are arranged in a dotted or striped pattern in the aerobic tank.

11. A wastewater treatment system, characterized in that, The aeration device includes any one of claims 1-10, and further includes an aerobic tank, wherein the aeration device is disposed within the aerobic tank.

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