Multistage aeration tank for sewage treatment

Abstract

The utility model discloses a multistage aeration tank for sewage treatment, and belongs to the technical field of aeration tanks. Comprising an aeration tank, a partition plate with an overflow tank is arranged in the aeration tank, one side of the partition plate is a settling zone, the other side of the partition plate is an aeration zone, and an aeration device is arranged in the aeration zone. According to the multistage aeration tank for sewage treatment, the main gas pipe and the multiple branch pipelines are arranged, the aeration heads are combined to release tiny bubbles, a contraction pipeline and a bent pipe structure are introduced to the water outlet end, and the gas-liquid mixing effect is enhanced by utilizing the fluid mechanics principle, so that the transfer efficiency of oxygen from a gas phase to a liquid phase is remarkably improved; therefore, aerobic microorganisms are promoted to efficiently degrade organic pollutants; a stirring assembly is arranged in the aeration tank, a motor drives a connecting frame and a stirring rod to rotate, liquid in the tank is continuously disturbed, sludge is evenly suspended in water, bottom sludge deposition is avoided, the sludge-water contact efficiency is improved, and the stability and the treatment capacity of the treatment system are enhanced.

Description

Technical Field

[0001] This utility model relates to the field of aeration tank technology, specifically a multi-stage aeration tank for sewage treatment. Background Technology

[0002] In traditional wastewater treatment methods, aeration tanks are widely used as a core unit to promote the aerobic biodegradation of organic pollutants in wastewater. However, conventional aeration systems in existing aeration tanks often use a single aeration head or pipeline for air supply, resulting in large air bubbles, small gas-liquid contact area, low oxygen transfer efficiency, and negatively impacting the overall treatment effect.

[0003] Therefore, there is an urgent need to design a multi-stage aeration tank for wastewater treatment with a reasonable structure and high operating efficiency to solve the above-mentioned problems in the existing technology and improve the stability and treatment efficiency of the wastewater treatment system. Utility Model Content

[0004] The summary section of this application is intended to provide a brief overview of the concepts, which will be described in detail in the detailed description section below. This summary section is not intended to identify key or essential features of the claimed technical solutions, nor is it intended to limit the scope of the claimed technical solutions.

[0005] In order to overcome the shortcomings of the prior art, this utility model provides a multi-stage aeration tank for sewage treatment.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a multi-stage aeration tank for sewage treatment, comprising an aeration tank, wherein the aeration tank is provided with a partition with an overflow trough, one side of the partition is a sedimentation zone, the other side of the partition is an aeration zone, and an aeration device is provided inside the aeration zone. The aeration device includes a main air pipe connected at one end to an external unit pump, which is fixed to the upper end of the aeration tank by a clamp. A water outlet pipe is provided on one side of the aeration tank, and a shrinkage pipe is connected to one side of the water outlet pipe by a flange. A bend is provided on one side of the shrinkage pipe. A second branch pipe is provided on the main air pipe, and one end of the second branch pipe passes through the water outlet pipe and extends into the shrinkage pipe.

[0007] Preferably, the main air pipe is further provided with several branch pipes, and each of the several branch pipes is equipped with a set of aeration heads at its upper end.

[0008] Preferably, the aeration tank is further provided with an agitation component, which includes a mounting plate. The mounting plate is fixedly installed at the upper end of the aeration tank, and a motor is installed at the upper end of the mounting plate.

[0009] Preferably, the output end of the motor is provided with a connecting frame, and the connecting frame is provided with multiple agitator rods.

[0010] Preferably, the sedimentation zone has a water inlet on the side away from the partition.

[0011] Preferably, the overflow trough is provided with a mesh screen inside, and the mesh screen is inserted and connected to the partition.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] This utility model discloses a multi-stage aeration tank for wastewater treatment. By setting up a main air pipe and multiple branch pipes, combined with aeration heads to release microbubbles, and introducing a contraction pipe and bend structure at the effluent end, it utilizes fluid mechanics principles to enhance the gas-liquid mixing effect, significantly improving the efficiency of oxygen transfer from the gas phase to the liquid phase, thereby promoting the efficient degradation of organic pollutants by aerobic microorganisms. The aeration tank is equipped with a stirring component, which is driven by a motor to rotate the connecting frame and stirring rod, continuously agitating the liquid in the tank, so that the sludge is evenly suspended in the water, avoiding sludge deposition at the bottom, improving sludge-water contact efficiency, and enhancing the stability and treatment capacity of the treatment system. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the multi-stage aeration tank structure for wastewater treatment according to this utility model. Figure 1 ;

[0015] Figure 2 This is a schematic diagram of the multi-stage aeration tank structure for wastewater treatment according to this utility model. Figure 2 ;

[0016] Figure 3 This is a schematic diagram of the multi-stage aeration tank structure for wastewater treatment according to this utility model. Figure 3 ;

[0017] Figure 4 This is a schematic diagram of the multi-stage aeration tank structure for wastewater treatment according to this utility model. Figure 4 .

[0018] In the diagram: 1. Aeration tank; 3. Baffle plate; 4. Mounting plate; 5. Motor; 6. Inlet; 7. Outlet pipe; 8. Contraction pipe; 9. Bend; 11. Main air pipe; 12. Branch pipe one; 13. Aeration head; 14. Connecting frame; 15. Stirring rod; 16. Branch pipe two; 17. Overflow trough; 18. Mesh screen. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figure 1-4 This embodiment provides the following technical solution:

[0021] A multi-stage aeration tank for wastewater treatment includes an aeration tank 1. The aeration tank 1 has a baffle 3 with an overflow trough 17 inside. One side of the baffle 3 is a sedimentation zone, and the other side of the baffle 3 is an aeration zone. An aeration device is installed inside the aeration zone. The aeration device includes a main air pipe 11 connected at one end to an external single pump and fixed to the upper end of the aeration tank 1 by a clamp. A water outlet pipe 7 is provided on one side of the aeration tank 1. A shrinkage pipe 8 is connected to one side of the water outlet pipe 7 by a flange. A bend 9 is provided on one side of the shrinkage pipe 8. A second branch pipe 16 is provided on the main air pipe 11, and one end of the second branch pipe 16 passes through the water outlet pipe 7 and extends into the shrinkage pipe 8. Several first branch pipes 12 are also provided on the main air pipe 11. A set of aeration heads 13 are installed at the upper end of each of the several first branch pipes 12. An inlet 6 is provided on the side of the sedimentation zone away from the baffle 3.

[0022] Specifically, the aeration device increases the dissolved oxygen content in the water, promoting the growth of aerobic microorganisms and thus decomposing organic matter in the wastewater. The aeration device includes a main air pipe 11 and branch pipes 12 and 16. Microbubbles are released into the water through the aeration head 13, increasing the oxygen concentration in the water and also aiding in mixing and preventing solid matter sedimentation. By setting up a contraction pipe 8, as the cross-sectional area of ​​the pipe gradually decreases, the liquid velocity increases, and the pressure decreases accordingly. Combined with the gas introduced through branch pipe 16, the gas and liquid are ejected from the same direction. The bend 9 enhances the gas-liquid mixing effect and further improves the oxygen transfer efficiency. The baffle 3 divides the aeration tank 1 into two parts: one part is used for aeration treatment, and the other part serves as a sedimentation zone to remove suspended solids from the water. Its function is to allow suspended particles to naturally settle to the bottom when the water flow velocity slows down, thereby achieving solid-liquid separation and purifying the water. The overflow tank 17 ensures that the water after sedimentation treatment can flow smoothly into the aeration zone.

[0023] The aeration tank 1 is also equipped with an agitation component, which includes a mounting plate 4. The mounting plate 4 is fixedly installed on the upper end of the aeration tank 1. A motor 5 is installed on the upper end of the mounting plate 4. A connecting frame 14 is installed on the output end of the motor 5. Multiple agitation rods 15 are installed inside the connecting frame 14.

[0024] Specifically, the stirring component can keep the sludge in aeration tank 1 continuously churning under low dissolved oxygen conditions, improving the mud-water mixing properties. After stirring, the sludge at the bottom of the aeration tank can be disturbed in time, effectively solving the problem of sludge accumulation at the bottom of aeration tank 1, and can also defoam the foam generated by aeration for the first time.

[0025] The agitator 15, driven by motor 5, effectively stirs the sludge and wastewater, ensuring thorough mixing and promoting contact between microorganisms and organic pollutants. The rotation of the agitator 15 and connecting frame 14 disrupts the original static state of the water, increasing the relative velocity between liquids and promoting oxygen diffusion from bubbles to the liquid phase, thus improving dissolved oxygen transfer efficiency. Furthermore, it helps break down larger bubbles into smaller ones, further increasing the gas-liquid contact area, which is beneficial for oxygen absorption. The high-speed rotation of the agitator 15 and connecting frame 14 generates strong shear forces, which tear surface foam into smaller pieces or cause it to collapse, reducing the amount of foam and its impact on the aeration process.

[0026] The overflow tank 17 is equipped with a mesh screen 18, and the mesh screen 18 is connected to the partition 3 by insertion.

[0027] Specifically, the mesh plate 18 has a good effect on blocking suspended matter. Since the mesh plate 18 is installed on the partition plate 3 by plugging, it can be easily disassembled for cleaning or replacement as needed, which is convenient for daily maintenance.

[0028] Working principle: During the operation of this multi-stage aeration tank for wastewater treatment, wastewater first enters the system through inlet 6 located in the sedimentation zone. After entering, the water flow velocity is significantly reduced, causing heavier suspended particles to naturally settle to the bottom of the tank under gravity, forming a sludge layer and achieving preliminary solid-liquid separation.

[0029] After initial sedimentation, the supernatant flows into the aeration zone through the overflow trough 17 on the baffle 3, completing the first stage of pretreatment. Inside the overflow trough 17, there is a detachable mesh plate 18 to further intercept fine suspended solids that have not yet completely settled, preventing them from entering the aeration zone, thereby ensuring the stability and treatment effect of the subsequent treatment process.

[0030] Upon entering the aeration zone, the external unit pump is activated, and gas is delivered through the main air pipe 11 to branch pipe 12 and branch pipe 2 16 respectively. Among them, a set of aeration heads 13 are connected to the end of branch pipe 12, which evenly releases air into tiny bubbles, diffuses them into the wastewater, effectively increases the dissolved oxygen concentration in the water, and promotes the efficient degradation of organic pollutants by aerobic microorganisms.

[0031] Meanwhile, the agitator installed at the top of the aeration tank 1 begins operation. Motor 5 drives the connecting frame 14 to rotate, causing multiple agitator rods 15 to continuously agitate the liquid within the tank. This agitation not only improves the uniformity of the mixing of sludge and wastewater but also enhances the contact efficiency between microorganisms and pollutants. Simultaneously, the shear force generated by the agitation helps to break down the foam structure formed on the water surface, achieving initial defoaming and breaking large bubbles into smaller ones, further increasing the gas-liquid contact area and improving oxygen transfer efficiency.

[0032] In addition, a gas-liquid mixing enhancement structure consisting of a contraction pipe 8 and a bend 9 is provided at the water outlet. When the water flows through the contraction pipe 8, whose cross-sectional area gradually decreases, the flow velocity increases and the pressure decreases. At this time, the gas introduced through the branch pipe 16 is ejected in the same direction as the water flow. Under the action of the bend 9, a strong turbulent mixing effect is formed, which significantly enhances the degree of gas-liquid mixing and further improves the oxygen transfer efficiency.

[0033] After thorough aeration and mixing, the wastewater is finally discharged from the system through effluent pipe 7, either entering the next treatment unit or being discharged directly in compliance with standards.

[0034] The above description is merely a selection of preferred embodiments of this disclosure and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the utility model involved in the embodiments of this disclosure is not limited to the technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in the embodiments of this disclosure.

Claims

1. A multi-stage aeration tank for wastewater treatment, comprising an aeration tank (1), characterized in that: The aeration tank (1) is equipped with a partition (3) with an overflow trough (17). One side of the partition (3) is a sedimentation zone, and the other side of the partition (3) is an aeration zone. An aeration device is provided inside the aeration zone. The aeration device includes a main air pipe (11) connected to an external unit pump at one end, which is fixed to the upper end of the aeration tank (1) by a clamp. A water outlet pipe (7) is provided on one side of the aeration tank (1). A shrink pipe (8) is connected to a flange on one side of the water outlet pipe (7). A bend pipe (9) is provided on one side of the shrink pipe (8). A branch pipe (16) is provided on the main air pipe (11), and one end of the branch pipe (16) passes through the water outlet pipe (7) and extends into the shrink pipe (8).

2. The multi-stage aeration tank for wastewater treatment according to claim 1, characterized in that: The main air pipe (11) is also provided with several branch pipes (12), and each branch pipe (12) is equipped with a set of aeration heads (13).

3. The multi-stage aeration tank for wastewater treatment according to claim 1, characterized in that: The aeration tank (1) is also equipped with an agitation component, which includes a mounting plate (4). The mounting plate (4) is fixedly installed on the upper end of the aeration tank (1), and a motor (5) is installed on the upper end of the mounting plate (4).

4. A multi-stage aeration tank for wastewater treatment according to claim 3, characterized in that: A connecting frame (14) is provided on the output end of the motor (5), and multiple stirring rods (15) are provided inside the connecting frame (14).

5. A multi-stage aeration tank for wastewater treatment according to claim 1, characterized in that: The sedimentation zone is provided with an inlet (6) on the side away from the partition (3).

6. A multi-stage aeration tank for wastewater treatment according to claim 1, characterized in that: The overflow trough (17) is provided with a mesh plate (18) inside, and the mesh plate (18) is connected to the partition plate (3) by insertion.

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