Contact oxidation pond with double aeration devices

Abstract

The utility model provides a contact oxidation pond with double aeration devices, and belongs to the technical field of sewage treatment. Comprising a contact oxidation pond body, a double-layer net rack structure composed of an upper-layer net rack and a lower-layer net rack is arranged on the upper portion in the contact oxidation pond body, elastic filler is arranged between the upper-layer net rack and the lower-layer net rack, and a lower aeration device is laid at the bottom of the contact oxidation pond body; an upper aeration device is arranged in the contact oxidation pond body and is positioned at the lower part of the double-layer net rack structure; the upper aeration device is fixed on the upper-layer net rack in a replaceable manner. According to the utility model, the upper aeration device is fixed on the upper-layer net rack and is convenient for personnel to install and operate, and when the aeration device at the bottom of the contact oxidation pond has the problems that the dissolved oxygen content in the pond is low and production halt and overhaul cannot be realized due to falling of an aeration head, the upper aeration device is directly started to increase the dissolved oxygen content in the pond to the required content; and the discharged sewage index is ensured to reach the standard.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewage treatment, and particularly relates to a contact oxidation tank with a double aeration device. Background Technique

[0002] In the contact oxidation tank of the sewage treatment facility in a cigarette factory, there is a double-layer grid and elastic packing sandwiched between the double-layer grid. An aeration device is provided at the bottom of the contact oxidation tank to increase the dissolved oxygen content in the tank. At present, in the aeration facility in the contact oxidation tank, the aeration heads fall off, the aeration in the tank is uneven, and the sludge enters the aeration pipeline through the connection of the fallen aeration heads. After the next aeration, the normal aeration heads are blocked, and the muddy water enters the aeration pipeline to block the remaining normal aeration heads, making it impossible to discharge air. As a result, the oxygen discharge outlet of the aeration system decreases, the dissolved oxygen content in the tank drops sharply, the biological bacteria do not have sufficient oxygen to support the metabolism, the activity of the bacterial species becomes poor, the COD and ammonia nitrogen concentrations of the up-to-standard discharged sewage increase rapidly, and the sewage discharge index of up-to-standard is affected. Since the existing aeration pipeline is at the bottom of the tank and under the lower part of the two-layer steel bar grid, the overhaul of this facility requires a 2-month production suspension. Therefore, the sewage treatment facility is generally overhauled only once every several years. Therefore, when the problem of low dissolved oxygen content in the tank caused by the falling off of the aeration heads occurs, it is impossible to carry out a production suspension for overhaul. To solve the above problems, generally, an air compressor is used to dredge the pipeline at the bottom of the tank through the main aeration pipeline, so that the aeration pipeline can be temporarily used normally. However, due to the start and stop of the Roots blower, the muddy water will still enter the aeration system, and the problem of reaching the standard of the oxygen content in the tank cannot be completely solved. Therefore, improvements must be made. Content of the Utility Model

[0003] The technical problem solved by the utility model: Provide a contact oxidation tank with a double aeration device. By improving the aeration device in the contact oxidation tank, the utility model solves the problems that the aeration device at the bottom of the contact oxidation tank has aeration heads falling off, resulting in low dissolved oxygen content in the tank and inability to carry out a production suspension for overhaul, and ensures that the sewage discharge index meets the standard.

[0004] To achieve the above object, the technical solution adopted by the utility model is:

[0005] A contact oxidation tank with a double aeration device, including a contact oxidation tank body. A double-layer grid structure composed of an upper grid and a lower grid is provided above the interior of the contact oxidation tank body. Elastic packing is provided between the upper grid and the lower grid. The bottom of the contact oxidation tank body is paved with a lower aeration device. An upper aeration device is provided inside the contact oxidation tank body and under the double-layer grid structure. The upper aeration device is fixedly installed on the upper grid in a replaceable manner.

[0006] For further limitation of the above solution, the upper aeration device includes an upper main aeration pipe, which is horizontally laid on the upper part of the upper grid and fixedly connected to the upper grid. A plurality of upper sub-aeration pipes I are evenly distributed and connected to both sides of the upper main aeration pipe. The upper sub-aeration pipes I are horizontally arranged and perpendicularly connected to the upper main aeration pipe. One end of each upper sub-aeration pipe I is connected to an upper sub-aeration pipe II. The upper sub-aeration pipe II vertically passes downward through the upper grid, elastic filler and lower grid. The lower end of the upper sub-aeration pipe II is connected to an upper aeration head, and the upper aeration head is located below the lower grid.

[0007] For further limitation of the above solution, the upper main aeration pipe is fixedly connected to the upper grid through fasteners.

[0008] For further limitation of the above solution, the lower aeration device includes a lower main aeration pipe. A plurality of lower sub-aeration pipes are evenly distributed and connected to the lower main aeration pipe, and lower aeration heads are provided on the lower sub-aeration pipes.

[0009] For further limitation of the above solution, it further includes an aerator and a distribution cylinder. Both the upper main aeration pipe and the lower main aeration pipe are connected to the distribution cylinder, and the distribution cylinder is connected to the aerator.

[0010] Advantages of the present utility model compared with the prior art:

[0011] 1. In this solution, an upper aeration device is provided inside the contact oxidation tank and below the double-layer grid structure. The upper aeration device is fixed on the upper grid, which is convenient for personnel installation and operation. When the aeration heads of the aeration device at the bottom of the contact oxidation tank fall off, resulting in low dissolved oxygen content in the tank and the inability to carry out shutdown and major overhaul, the upper aeration device can be directly turned on to increase the dissolved oxygen content in the tank to the required content, ensuring that the discharged sewage index meets the standard.

[0012] 2. In this solution, although the upper aeration heads in the upper aeration device are arranged below the lower grid, the upper aeration device is fixed by fixing the upper main aeration pipe on the upper part of the upper grid, thus ensuring convenient installation of the upper aeration device and easy maintenance and replacement in case of damage, extending the service life of the contact oxidation tank and ensuring the normal progress of production. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the internal structure of the contact oxidation tank in the present utility model;

[0014] Figure 2 It is a top view layout schematic diagram of the upper aeration device in the present utility model;

[0015] Figure 3 It is a top view layout schematic diagram of the lower aeration device in the present utility model. Detailed implementation mode

[0016] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present utility model.

[0017] It should be noted that in this article, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation. The element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, article or device including the said element.

[0018] Please refer to Figures 1-3 for a detailed description of the embodiments of the present utility model.

[0019] Embodiment: Refer to Figure 1 As shown, an oxidation ditch with a double aeration device includes an oxidation ditch main body 1. A double-layer grid structure composed of an upper grid 2 and a lower grid 3 is arranged above the interior of the oxidation ditch main body 1. An elastic filler 4 is arranged between the upper grid 2 and the lower grid 3. It is characterized in that: a lower aeration device 5 is laid at the bottom of the oxidation ditch main body 1, and an upper aeration device 6 is arranged inside the oxidation ditch main body 1 and below the double-layer grid structure. The upper aeration device 6 is fixedly arranged on the upper grid 2 in a replaceable manner.

[0020] In this embodiment, by arranging an upper aeration device inside the oxidation ditch main body and below the double-layer grid structure, and the upper aeration device is fixed on the upper grid, it is convenient for personnel to install and operate. When the aeration head of the aeration device at the bottom of the oxidation ditch falls off, resulting in a low dissolved oxygen content in the tank and the inability to carry out a major overhaul during production stoppage, the upper aeration device can be directly turned on to increase the dissolved oxygen content in the tank to the required content and ensure that the discharged sewage index meets the standard.

[0021] In a specific implementation mode, refer to Figure 2As shown in the figure, the upper aeration device 6 includes an upper main aeration pipe 6-1, which is horizontally laid on the upper part of the upper grid 2 and fixedly connected to the upper grid 2. A plurality of upper sub-aeration pipes I 6-2 are evenly distributed and connected on both sides of the upper main aeration pipe 6-1. The upper sub-aeration pipes I 6-2 are horizontally arranged and vertically connected to the upper main aeration pipe 6-1. One end of each upper sub-aeration pipe I 6-2 is connected to an upper sub-aeration pipe II 6-3. The upper sub-aeration pipe II 6-3 vertically penetrates downward through the upper grid 2, the elastic filler 4 and the lower grid 3. The lower end of the upper sub-aeration pipe II 6-3 is connected to an upper aeration head 6-4, and the upper aeration head 6-4 is located below the lower grid 3. The upper main aeration pipe 6-1 is fixedly connected to the upper grid 2 through a fastener 6-5.

[0022] In this embodiment, the height of the upper grid from the pool top is only 550 mm, and there is 3.5 m of elastic filler in the double-layer grid. The aeration device must pass through about 3.8 m of the upper and lower two layers of grids to meet the aeration requirements. Therefore, the upper main aeration pipe is directly fixed on the upper grid, and the length of the upper sub-aeration pipe II is set to meet the requirement of penetrating into the lower grid. Due to the obstruction of the upper grid of the contact oxidation tank and the fact that the water tank is a confined space with hydrogen sulfide gas present, it is not possible to carry out hot work or insert the entire pipe into the tank. After testing, the upper main aeration pipe is divided into sections of 3M each, and the upper sub-aeration pipe I is divided into sections of 600 mm each, and they are connected with flanges and fixed above the upper grid. When distributing the aeration heads, the gas volume area of one aerator is 6 square meters. After checking the original lower aeration device and the aeration volume on the drawing, the aerators are distributed in a pattern of alternating long and short arrangements to avoid gas volume concentration and prevent the membrane on the filler from falling off.

[0023] In this embodiment, although the upper aeration head in the upper aeration device is arranged below the lower grid, the upper aeration device is fixed by fixing the upper main aeration pipe on the upper part of the upper grid, which ensures the convenient installation of the upper aeration device and is also convenient for maintenance in case of damage, thereby extending the service time of the contact oxidation tank and ensuring the normal progress of production.

[0024] In a specific embodiment, refer to Figure 3 As shown in the figure, the lower aeration device 5 includes a lower main aeration pipe 5-1, and a plurality of lower sub-aeration pipes 5-2 are evenly distributed and connected to the lower main aeration pipe 5-1. The lower sub-aeration pipes 5-2 are provided with lower aeration heads 5-3. This structure is the existing aeration structure in the contact oxidation tank.

[0025] In a specific embodiment, it further includes an aerator 8 and a distribution cylinder 7. The upper main aeration pipe 6-1 and the lower main aeration pipe 5-1 are both connected to the distribution cylinder 7, and the distribution cylinder 7 is connected to the aerator 8. This structure enables the upper aeration device and the lower aeration device to share a set of aerators to realize the use of the device.

[0026] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and the present utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present utility model. Any reference signs in the claims should not be construed as limiting the claims involved.

[0027] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. Contact oxidation tank with double aeration device, comprising a contact oxidation tank body (1), wherein a double-layer grid structure composed of an upper grid (2) and a lower grid (3) is arranged above the interior of the contact oxidation tank body (1), and an elastic filler (4) is arranged between the upper grid (2) and the lower grid (3), characterized in that: A lower aeration device (5) is laid at the bottom of the biological contact oxidation tank body (1). An upper aeration device (6) is arranged inside the biological contact oxidation tank body (1) and below the double-layer grid structure. The upper aeration device (6) is fixedly installed on the upper grid (2) in a replaceable manner.

2. The contact oxidation tank with a double aeration device according to claim 1, characterized in that: The upper aeration device (6) includes an upper main aeration pipe (6-1). The upper main aeration pipe (6-1) is horizontally laid above the upper grid (2) and fixedly connected to the upper grid (2). A plurality of first upper aeration branch pipes (6-2) are evenly connected to both sides of the upper main aeration pipe (6-1). The first upper aeration branch pipes (6-2) are horizontally arranged and perpendicularly connected to the upper main aeration pipe (6-1). One end of each first upper aeration branch pipe (6-2) is connected to a second upper aeration branch pipe (6-3). The second upper aeration branch pipe (6-3) vertically passes downward through the upper grid (2), the elastic filler (4), and the lower grid (3). The lower end of the second upper aeration branch pipe (6-3) is connected to an upper aeration head (6-4). The upper aeration head (6-4) is located below the lower grid (3).

3. The contact oxidation tank with a double aeration device according to claim 2, characterized in that: The upper main aeration pipe (6-1) is fixedly connected to the upper grid (2) through a fastener (6-5).

4. The contact oxidation tank with a double aeration device according to claim 2, characterized in that: The lower aeration device (5) includes a lower main aeration pipe (5-1). A plurality of lower aeration branch pipes (5-2) are evenly connected to the lower main aeration pipe (5-1). Lower aeration heads (5-3) are arranged on the lower aeration branch pipes (5-2).

5. The contact oxidation tank with a dual aeration device according to claim 4, characterized in that: It further includes an aerator (8) and an air distribution cylinder (7). The upper main aeration pipe (6-1) and the lower main aeration pipe (5-1) are both connected to the air distribution cylinder (7). The air distribution cylinder (7) is connected to the aerator (8).

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