Aerobic granular sludge sewage treatment system based on high-concentration oxygen enhancement

Abstract

The utility model provides an aerobic granular sludge sewage treatment system based on high-concentration oxygen enhancement, which relates to the technical field of sewage treatment, and comprises a reaction tank, a guide cylinder, an air supply mechanism, an oxygen supply mechanism and a plurality of groups of gradient aeration components, the guide cylinder is arranged in the reaction tank, and the bottom of the reaction tank is connected with a water inlet module; the gradient aeration assemblies are arranged in the guide cylinder, each gradient aeration assembly comprises a ventilation screw rod and a plurality of microporous ceramic aeration parts arranged on the ventilation screw rod, the diameters of the microporous ceramic aeration parts from bottom to top are gradually reduced, and the distance between every two adjacent microporous ceramic aeration parts is gradually increased. The oxygen supply mechanism is arranged to be matched with the gradient aeration assembly, aeration intensity gradient control is formed, compared with traditional air aeration, the content of dissolved oxygen in sewage can be effectively increased, the problem of sludge disintegration caused by formation of an anoxic / anaerobic zone is avoided, high aeration intensity is not needed, and energy consumption is reduced.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to an aerobic granular sludge wastewater treatment system based on high-concentration oxygen enhancement. Background Technology

[0002] The main reason why aerobic granular sludge requires aeration is to provide sufficient dissolved oxygen to ensure the normal metabolism and activity of microorganisms. Traditional aerobic granular sludge processes have the following technical bottlenecks: oxygen mass transfer limitation: air aeration (21% O2) leads to insufficient dissolved oxygen (DO), usually <3 mg / L, which easily forms anoxic / anaerobic zones inside the granules, causing sludge disintegration. Maintaining granule stability requires high aeration intensity, generally an air-to-water ratio >10:1, which increases the energy consumption required for the treatment process. In response to the above defects, this application is proposed. Utility Model Content

[0003] The purpose of this invention is to provide an aerobic granular sludge wastewater treatment system based on high-concentration oxygen enhancement, which solves the problems of insufficient dissolved oxygen and high energy consumption in the current aerobic granular sludge treatment process.

[0004] To address the aforementioned problems, this utility model provides an aerobic granular sludge wastewater treatment system enhanced with high-concentration oxygen, comprising a reaction tank, a guide tube, an air supply mechanism, an oxygen supply mechanism, and gradient aeration components. The guide tube is disposed in the reaction tank, and the bottom of the reaction tank is connected to an inlet module. Several groups of gradient aeration components are disposed and connected to the air supply mechanism and the oxygen supply mechanism, and are all disposed in the guide tube. Each gradient aeration component includes an air-permeable screw and several microporous ceramic aeration sections disposed on the air-permeable screw. The diameter of the microporous ceramic aeration sections gradually decreases from bottom to top, and the spacing between adjacent microporous ceramic aeration sections gradually increases, forming a multi-layered aeration gradient with decreasing intensity from bottom to top.

[0005] According to one embodiment of the present invention, at least three sets of microporous ceramic aeration sections are installed on each venting screw to form an aeration gradient of bottom layer, middle layer and top layer.

[0006] According to one embodiment of the present invention, the aeration intensity of the bottom layer is 5~8 L / min·m², the aeration intensity of the middle layer is 3~5 L / min·m, and the aeration intensity of the top layer decreases accordingly.

[0007] According to one embodiment of the present invention, the air supply mechanism includes a blower, an air flow meter, and an air regulating valve.

[0008] According to one embodiment of the present invention, the oxygen supply mechanism includes an oxygen source, an oxygen flow meter, and an oxygen regulating valve, wherein the oxygen source is an oxygen generator or a liquid oxygen storage tank.

[0009] According to one embodiment of this utility model, a selective screen, preferably with a pore size of 1-2 mm, is provided in the reaction tank to trap large sludge particles. Larger sludge particles reduce oxygen transfer efficiency because oxygen is less likely to penetrate into them, leading to localized hypoxia and affecting microbial activity. These larger sludge particles can be treated separately, reducing their impact on sludge treatment efficiency and system stability.

[0010] According to one embodiment of the present invention, the selective screen is connected to the track assembly. The selective screen can be configured as an annular screen and installed on several track assemblies. The selective screen can move on the track assembly.

[0011] According to one embodiment of the present invention, an impeller assembly is provided at the bottom of the guide tube to draw sewage from the bottom inlet area into the guide tube, thereby reducing the rotational flow on the horizontal surface of the liquid and enhancing the axial flow, thus improving the aeration effect.

[0012] According to one embodiment of the present invention, the reaction tank is connected to the sedimentation tank.

[0013] According to one embodiment of the present invention, a reflux pipe is provided between the sedimentation tank and the reaction tank.

[0014] The beneficial effects of this invention are that by setting up an oxygen supply mechanism in conjunction with a gradient aeration component, a gradient control of aeration intensity can be formed. Compared with traditional air aeration, this can effectively increase the dissolved oxygen content in wastewater, avoid the formation of anoxic / anaerobic zones and the resulting sludge disintegration problem, and reduce energy consumption without requiring high aeration intensity. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 This is a schematic diagram of the aerobic granular sludge wastewater treatment system enhanced with high-concentration oxygen in Example 1;

[0017] Figure 2 This is a schematic diagram of the gradient aeration component.

[0018] Figure 3 A plan view showing the ring arrangement of the gradient aeration components;

[0019] Figure 4 A plan view showing the matrix arrangement of the gradient aeration components;

[0020] Figure 5 This is a schematic diagram of the aerobic granular sludge wastewater treatment system enhanced with high concentration of oxygen in Example 3. Detailed Implementation

[0021] The following description is only intended to disclose the present invention so that those skilled in the art can implement it. The embodiments in the following description are merely examples, and those skilled in the art will conceive of other obvious modifications. The basic principles of the present invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other solutions that do not depart from the spirit and scope of the present invention.

[0022] Example 1:

[0023] Aerobic granular sludge wastewater treatment systems enhanced with high-concentration oxygen, such as Figure 1 It includes a reaction tank 1, a guide tube 10, an air supply mechanism, an oxygen supply mechanism, and a gradient aeration assembly 11. The guide tube 10 is installed in the reaction tank 1. The bottom of the reaction tank 1 is connected to the water inlet module 12. The bottom of the guide tube 10 and the outer area of ​​the guide tube 10 are connected to the water inlet area 16 at the bottom of the reaction tank 1.

[0024] The reaction tank 1 has a cylindrical structure with a height-to-diameter ratio of 4:1 to 6:1, and an internal flow guide tube 10 forms an internal circulation.

[0025] The air supply mechanism includes a blower 4, an air flow meter 5, and an air regulating valve 6.

[0026] The oxygen supply system includes an oxygen source 7, an oxygen flow meter 8, and an oxygen regulating valve 9. The oxygen source 7 is an oxygen generator or a liquid oxygen storage tank.

[0027] Staff adaptively control the ratio of air and oxygen by adjusting valves based on wastewater parameters to provide high concentrations of oxygen. High-energy oxygen can maintain the aerobic activity of the aerobic particulate sludge surface and prevent it from turning completely into anoxic, which would lead to sludge acidification and hydrolysis.

[0028] Several groups of gradient aeration components 11 are provided, all of which are installed in the guide tube 10. The configuration can be as follows: Figure 3 , Figure 4 It can be arranged in a ring or a matrix.

[0029] like Figure 2 The gradient aeration component 11 includes an air-supplied screw 111 and several microporous ceramic aeration sections 112 disposed on the air-supplied screw 111. The air-supplied screw 111 is connected to an air supply pipe, which is connected to an air supply mechanism and an oxygen supply mechanism. The air-supplied screw 111 is provided with air holes 113 connected to the microporous ceramic aeration sections 112. The structure is similar to that of a corundum aerator. The microporous ceramic aeration sections 112 can be spherical, spherical, flat, etc. The diameter of the microporous ceramic aeration sections 112 gradually decreases from the bottom to the top, and the distance between adjacent microporous ceramic aeration sections 112 gradually increases, forming a multi-layer aeration gradient.

[0030] Preferably, 3 to 4 sets of microporous ceramic aeration sections 112 are provided. In this embodiment, three sets of microporous ceramic aeration sections 112 are provided to form an aeration gradient of bottom layer, middle layer and top layer. The aeration intensity of the bottom layer is 5 to 8 L / min·m², the aeration intensity of the middle layer is 3 to 5 L / min·m, and the aeration intensity of the top layer is 1 to 3 L / min·m.

[0031] By combining the oxygen supply mechanism with the gradient aeration component 11, a gradient control of aeration intensity is formed, the DO concentration in the reaction zone is maintained at 5-8 mg / L, the aeration pressure is 0.05-0.15 MPa, the oxygen consumption per unit COD removal is reduced by 40%-50%, and the granular sludge cultivation cycle is shortened.

[0032] Preferably, the bottom of the guide tube 10 is provided with an impeller assembly 17, which is used to draw the sewage in the bottom inlet area 16 into the guide tube 10, thereby reducing the rotational flow on the horizontal surface of the liquid and enhancing the axial flow, thus improving the aeration effect.

[0033] Example 2:

[0034] Based on Example 1, in this example, a selective screen 18, preferably with a pore size of 1-2 mm, is installed in the reaction tank 1 to trap large sludge particles. Larger sludge particles reduce oxygen transfer efficiency because oxygen is less likely to penetrate into them, leading to localized hypoxia and affecting microbial activity. These sludge particles can be treated separately, reducing their impact on sludge treatment efficiency and system stability.

[0035] Preferably, the selective screen 18 is connected to the track assembly 15. The selective screen 18 can be configured as an annular screen and installed on several track assemblies 15. The selective screen 18 can move on the track assembly 15 and can be driven by a chain or other drive mechanism, which facilitates the height adjustment of the selective screen 18 and allows it to rise and leave the reaction tank.

[0036] Example 3:

[0037] Based on Example 1 or 2, such as Figure 5 The reaction tank 1 and the sedimentation tank 2 are connected by a drainage structure 13. The aerated wastewater enters the sedimentation tank 2 for sedimentation treatment.

[0038] Preferably, a return pipe 14 is provided between the sedimentation tank 2 and the reaction tank 1, which can regulate the sludge concentration through sludge return to ensure stable biological treatment efficiency.

[0039] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functional and structural principles of the present invention have been shown and explained in the embodiments. Without departing from the stated principles, the implementation of the present invention may have any variations and modifications.

Claims

1. An aerobic granular sludge wastewater treatment system based on high concentration oxygen intensification, characterized by: The system includes a reaction tank (1), a guide tube (10), an air supply mechanism, an oxygen supply mechanism, and a gradient aeration assembly (11). The guide tube (10) is located in the reaction tank (1). The bottom of the reaction tank (1) is connected to an inlet module (12). Several groups of gradient aeration assemblies (11) are provided and connected to the air supply mechanism and the oxygen supply mechanism. They are all located in the guide tube (10). The gradient aeration assembly (11) includes an air screw (111) and several microporous ceramic aeration parts (112) located on the air screw (111). The diameter of the microporous ceramic aeration parts (112) gradually decreases from the bottom to the top, and the distance between adjacent microporous ceramic aeration parts (112) gradually increases, forming a multi-layered aeration gradient with decreasing intensity.

2. The high concentrated oxygen reinforced aerobic granular sludge wastewater treatment system according to claim 1, characterized in that: At least three sets of microporous ceramic aeration sections (112) are installed on each aeration screw (111) to form an aeration gradient of bottom, middle and top layers.

3. The high concentrated oxygen reinforced aerobic granular sludge wastewater treatment system according to claim 2, characterized in that: The aeration intensity of the bottom layer is 5~8 L / min·m², and the aeration intensity of the middle layer is 3~5 L / min·m².

4. The high concentrated oxygen reinforced aerobic granular sludge wastewater treatment system according to any one of claims 1-3, characterized in that: The air supply mechanism includes a blower (4), an air flow meter (5), and an air regulating valve (6).

5. The high concentrated oxygen reinforced aerobic granular sludge wastewater treatment system according to claim 4, characterized in that: The oxygen supply mechanism includes an oxygen source (7), an oxygen flow meter (8), and an oxygen regulating valve (9). The oxygen source (7) is an oxygen generator or a liquid oxygen storage tank.

6. The high concentrated oxygen reinforced aerobic granular sludge wastewater treatment system according to claim 1, wherein: The reaction tank (1) is equipped with a selective screen (18).

7. The high concentrated oxygen reinforced aerobic granular sludge wastewater treatment system according to claim 6, characterized in that: The selective screen (18) is connected to the track assembly (15).

8. The high concentrated oxygen reinforced aerobic granular sludge wastewater treatment system according to any one of claims 5-7, characterized in that: An impeller assembly (17) is provided at the bottom of the guide tube (10).

9. The high concentrated oxygen reinforced aerobic granular sludge wastewater treatment system according to claim 1, wherein: The reaction tank (1) is connected to the sedimentation tank (2).

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