Sewage treatment device and sewage treatment system

Abstract

The present disclosure relates to a sewage treatment device and a sewage treatment system. The sewage treatment device comprises an anaerobic tank, an anoxic tank, an aerobic tank and a sedimentation tank which are connected in sequence. The sedimentation tank is also connected to the anaerobic tank. A first aeration device is arranged in the aerobic tank. The aeration port of the first aeration device is arranged near the midline of the depth of the aerobic tank, and the aeration direction of the aeration port is opposite to the bottom of the aerobic tank, so as to form an aerobic zone at least above the first aeration device and an anoxic zone below the first aeration device, so that sludge in the aerobic tank accumulates in the anoxic zone to form a carbon source; the space occupied by the aerobic zone in the aerobic tank is larger than the space occupied by the anoxic zone in the aerobic tank. Based on this, the sewage treatment device provided by the present disclosure can generate its own carbon source, thereby avoiding the defect of the prior art that an external carbon source is required, reducing the sewage treatment cost, and achieving a good sewage treatment effect.

Description

Technical Field

[0001] The present disclosure relates to the technical field of sewage treatment, and in particular to a sewage treatment device and a sewage treatment system. Background Art

[0002] The sewage treatment plant generally includes an anaerobic tank, an anoxic tank, an aerobic tank and a sedimentation tank which are connected in sequence. The aerobic tank is provided with an aeration device which is usually arranged at the bottom of the aerobic tank to aerate the aerobic zone to improve the oxygen mass transfer efficiency of the aerobic zone.

[0003] However, in actual operation, it was found that the carbon-nitrogen ratio in the sewage treatment device was relatively low and the sewage treatment effect was poor. In order to ensure the sewage treatment efficiency, an external carbon source is usually required to increase the carbon-nitrogen ratio for effective denitrification, but the cost of the external carbon source is very high. Summary of the invention

[0004] In order to solve the above technical problems or at least partially solve the above technical problems, the present disclosure provides a sewage treatment device and a sewage treatment system.

[0005] In order to achieve the above-mentioned purpose, the present disclosure provides a sewage treatment device on the one hand, comprising an anaerobic tank, an anoxic tank, an aerobic tank and a sedimentation tank connected in sequence, the sedimentation tank is also connected to the anaerobic tank, a first aeration device is arranged in the aerobic tank, an aeration port of the first aeration device is arranged near the midline of the depth of the aerobic tank, and an aeration direction of the aeration port is opposite to the bottom of the aerobic tank, so as to form an aerobic zone at least above the first aeration device and an anoxic zone below the first aeration device, so that the sludge in the aerobic tank accumulates in the anoxic zone to form a carbon source; the space occupied by the aerobic zone in the aerobic tank is larger than the space occupied by the anoxic zone in the aerobic tank.

[0006] Furthermore, the height of the aeration port of the first aeration device is 1 / 4 to 1 / 2 of the depth of the aerobic tank.

[0007] Furthermore, the ratio of the space occupied by the anoxic zone in the aerobic pool to the space occupied by the aerobic zone in the aerobic pool is 1:5 to 1:3.

[0008] Furthermore, the aerobic zone includes a first aerobic zone and a second aerobic zone; the first aeration device is arranged in the first aerobic zone, the anoxic zone is located directly below the first aerobic zone, the highest liquid level of the second aerobic zone is flush with the highest liquid level of the first aerobic zone, and the lowest liquid level of the second aerobic zone is flush with the lowest liquid level of the anoxic zone.

[0009] Furthermore, the aerobic pool has an inlet and an outlet, the first aerobic zone is arranged near the inlet, and the second aerobic zone is arranged near the outlet.

[0010] Furthermore, a second aeration device is provided at the bottom of the second aerobic zone, and the second aeration device is used to lift the sludge accumulated in the second aerobic zone.

[0011] Furthermore, a third aeration device is provided at the bottom of the anoxic zone, and the third aeration device is used to lift the sludge accumulated in the anoxic zone.

[0012] Furthermore, the third aeration device is located at the geometric center of the bottom of the anoxic zone.

[0013] Furthermore, there are at least two aerobic pools, and at least two of the aerobic pools are connected in sequence; along the water flow direction, the first of at least two aerobic pools is connected to the anoxic pool, and the last of at least two aerobic pools is connected to the sedimentation pool.

[0014] Another aspect of the present disclosure provides a sewage treatment system, comprising the above-mentioned sewage treatment device.

[0015] Compared with the prior art, the technical solution provided by the embodiments of the present disclosure has the following advantages:

[0016] The sewage treatment device and sewage treatment system provided by the present disclosure are provided with an anaerobic tank, an anoxic tank, an aerobic tank and a sedimentation tank which are connected in sequence, and the sedimentation tank is also connected with the anaerobic tank, wherein the aerobic tank is provided with a first aeration device, and the aeration port of the first aeration device is arranged near the midline of the depth of the aerobic tank, that is, the first aeration device is approximately located at half the depth of the aerobic tank, and the aeration direction of the aeration port is opposite to the bottom of the aerobic tank, that is, the aeration port of the first aeration device will not aerate toward the bottom wall of the aerobic tank, so as to form an aerobic zone at least above the first aeration device and an anoxic zone below the first aeration device, that is, a vertical A / O system with the aerobic zone above and the anoxic zone below is formed in the aerobic tank, so that the sludge in the aerobic tank is accumulated in the anoxic zone, i.e., the bottom of the tank, to form a carbon source; wherein the space occupied by the aerobic zone in the aerobic tank is larger than the space occupied by the anoxic zone in the aerobic tank. Based on this, the sewage treatment device provided by the present invention can form a vertical A / O system with aerobic at the top and anoxic at the bottom in the aerobic tank. The bottom of the aerobic tank is no longer aerated, thereby forming an anaerobic state, so that sludge is also accumulated at the bottom of the aerobic tank. The sludge will be hydrolyzed to generate volatile acid after accumulating at the bottom of the aerobic tank for a long time, that is, it can regenerate a high-quality carbon source, thereby avoiding the defect of the prior art that an external carbon source is required, reducing the cost of sewage treatment, and achieving good sewage treatment effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0019] Figure 1 It is a structural schematic diagram of the sewage treatment device according to an embodiment of the present disclosure;

[0020] Figure 2 It is a schematic diagram of the structure of an aerobic tank of a sewage treatment device according to an embodiment of the present disclosure;

[0021] Figure 3 It is a schematic structural diagram of an aerobic tank of a sewage treatment device according to another embodiment of the present disclosure;

[0022] Figure 4 This is a schematic diagram of the sludge operation in the aerobic tank of the sewage treatment device described in the embodiment of the present disclosure.

[0023] Among them, 1. anaerobic tank; 2. anoxic tank; 3. aerobic tank; 31. anoxic zone; 32. aerobic zone; 321. first aerobic zone; 322. second aerobic zone; 33. inlet; 34. outlet; 4. sedimentation tank; 5. third aeration device. DETAILED DESCRIPTION

[0024] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0025] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0026] Embodiment 1

[0027] refer to Figures 1 to 4As shown in , this embodiment provides a sewage treatment device, including an anaerobic tank 1, an anoxic tank 2, an aerobic tank 3 and a sedimentation tank 4 which are connected in sequence, the sedimentation tank 4 is also connected to the anaerobic tank 1, a first aeration device is arranged in the aerobic tank 3, an aeration port of the first aeration device is arranged near the midline of the depth of the aerobic tank 3, and an aeration direction of the aeration port is opposite to the bottom of the aerobic tank 3, so as to form an aerobic zone 32 at least above the first aeration device and an anoxic zone 31 below the first aeration device, so that the sludge in the aerobic tank 3 accumulates in the anoxic zone 31 to form a carbon source; the space occupied by the aerobic zone 32 in the aerobic tank 3 is larger than the space occupied by the anoxic zone 31 in the aerobic tank 3.

[0028] In this embodiment, the first aeration device is close to the midline of the depth of the aerobic tank 3, and the aeration direction of the aeration port is opposite to the bottom of the aerobic tank 3, that is, the aeration device aerates toward the upper part of the aerobic tank 3, and no longer aerates at the bottom of the aerobic tank 3, thereby forming a vertical A / O system with aerobic on the top and anoxic on the bottom in the aerobic tank 3, thereby adding an anoxic reaction section on the basis of the anaerobic-anoxic-oxic (AAO) process, that is, forming four biochemical reaction sections of anaerobic-anoxic-aerobic-anoxic, wherein the aerobic-anoxic reaction section is simultaneously located in the aerobic tank 3, and forming a vertical A / O system with aerobic on the top and anoxic on the bottom in the aerobic tank 3.

[0029] It can be understood that the sewage first enters the anaerobic tank 1 for anaerobic reaction, then enters the anoxic tank 2 for anoxic reaction, then enters the aerobic tank 3 for aerobic reaction and anoxic reaction, and finally enters the sedimentation tank 4 for sedimentation treatment. Among them, the sewage will be precipitated in the anoxic zone 31 in the aerobic tank 3, and the sludge will be hydrolyzed to produce volatile acid after a long period of precipitation, that is, a high-quality carbon source is produced by itself, thereby meeting the carbon required by the sewage treatment device provided in this embodiment, without the need for an external carbon source, saving costs, and achieving a good sewage treatment effect.

[0030] In this embodiment, the first aeration device in the aerobic zone 32 is equivalent to the upper layer aeration, so as to provide sufficient dissolved oxygen for the aerobic pool 3 to ensure the removal efficiency of organic matter and the progress of nitrification.

[0031] In specific implementation, the first aeration device can be any suitable structure, such as a suspension chain microporous aerator, which includes an aeration main pipe and a tubular microporous aerator connected to the aeration main pipe. The aeration main pipe can be set on the surface of the water body, and the tubular microporous aerator is suspended at the lower part of the aeration main pipe, and air is supplied through the air inlet branch pipe, which is simple to install and easy to maintain.

[0032] refer to Figure 2As shown in , generally, the first aeration devices can be arranged near the horizontal plane where the midline of the depth of the aerobic tank 3 is located, that is, the horizontal plane parallel to the bottom of the aerobic tank 3. At this time, a vertical A / O system with an upper aerobic zone 32 and a lower anoxic zone 31 is formed in the aerobic tank 3.

[0033] refer to Figure 3 As shown in , according to some embodiments, the first aeration device is arranged in a partial area of ​​the horizontal plane near the midline of the depth of the aerobic tank 3. At this time, a vertical A / O system is formed in the aerobic tank 3, in which a part of the bottom area of ​​the aerobic tank 3 is an anoxic zone 31 and the rest of the aerobic tank 3 is an aerobic zone 32.

[0034] In specific implementation, the sewage has a longer residence time in the anoxic zone 31, so that the larger anaerobic zone volume in the lower layer has a longer time to hydrolyze the sludge into carbon sources. In this stage, the anaerobic process hydrolyzes the macromolecules in the sewage that are not easily degraded into small molecules that are easily utilized by organisms, and the hydrolysis effect is strong; the long anaerobic / anoxic process allows the nitrate carried by the return sludge to be completely reduced and the dissolved oxygen to be utilized by microorganisms and completely consume oxygen; at the same time, the carbon source generated in the lower anaerobic zone of the aerobic tank 3 is timely utilized by the "simultaneous nitrification and denitrification" of the upper layer, with high utilization efficiency and high sewage treatment efficiency.

[0035] Through the above technical scheme, the sewage treatment device and sewage treatment system provided in this embodiment are provided with an anaerobic tank 1, an anoxic tank 2, an aerobic tank 3 and a sedimentation tank 4 which are connected in sequence, and the sedimentation tank 4 is also connected with the anaerobic tank 1, wherein the aerobic tank 3 has a first aeration device, and the aeration port of the first aeration device is arranged near the midline of the depth of the aerobic tank 3, that is, the first aeration device is approximately located at half the depth of the aerobic tank 3, and the aeration direction of the aeration port is opposite to the bottom of the aerobic tank 3, That is, the aeration port of the first aeration device will not aerate toward the bottom wall of the aerobic tank 3, so as to form an aerobic zone 32 at least above the first aeration device and an anoxic zone 31 below the first aeration device, that is, a vertical A / O system is formed in the aerobic tank 3 with the aerobic zone 32 at the top and the anoxic zone 31 at the bottom, so that the sludge in the aerobic tank 3 accumulates in the anoxic zone 31, i.e., the bottom of the tank, to form a carbon source; wherein the space occupied by the aerobic zone 32 in the aerobic tank 3 is larger than the space occupied by the anoxic zone 31 in the aerobic tank 3. Based on this, the sewage treatment device provided by the present invention can form a vertical A / O system with aerobic at the top and anoxic at the bottom in the aerobic tank 3. The bottom of the aerobic tank 3 is no longer aerated, thereby forming an anaerobic state, so that sludge is also accumulated at the bottom of the aerobic tank 3. The sludge will be hydrolyzed to generate volatile acid after accumulating at the bottom of the aerobic tank 3 for a long time, that is, it can regenerate a high-quality carbon source, thereby avoiding the defect of the prior art that an external carbon source is required, reducing the sewage treatment cost, and achieving a good sewage treatment effect.

[0036] In this embodiment, the aeration port of the first aeration device is located at a height of 1 / 4 to 1 / 2 of the depth of the aerobic tank 3 .

[0037] Generally, the aerobic tank 3 is mainly used for aerobic reactions, so the space occupied by the aerobic zone 32 in the aerobic tank 3 should be larger than the space occupied by the anoxic zone 31 in the aerobic tank 3. Based on this, the height of the aeration port of the first aeration device is 1 / 4 to 1 / 2 of the depth of the aerobic tank 3, thereby forming an anoxic zone 31 of appropriate space in the area between the first aeration device and the bottom of the aerobic tank 3, so that sludge can be deposited in the anoxic zone 31. The sludge can be hydrolyzed to generate volatile acid, i.e., self-produced carbon source, after being deposited for a long time.

[0038] Furthermore, the ratio of the space occupied by the anoxic zone 31 in the aerobic pool 3 to the space occupied by the aerobic zone 32 in the aerobic pool 3 is 1:5 to 1:3, so that on the basis of ensuring that the aerobic pool 3 has an effective aerobic reaction space, an anoxic zone 31 is constructed at the bottom of the aerobic pool 3 to generate a self-generated carbon source, thereby ensuring the carbon source required by the sewage treatment device provided in this embodiment, with good nitrification and denitrification effects, high sewage treatment efficiency and low cost.

[0039] In this embodiment, reference Figure 3 As shown in the figure, the aerobic zone 32 includes a first aerobic zone 321 and a second aerobic zone 322; the first aeration device is arranged in the first aerobic zone 321, the anoxic zone 31 is located directly below the first aerobic zone 321, the highest liquid level of the second aerobic zone 322 is flush with the highest liquid level of the first aerobic zone 321, and the lowest liquid level of the second aerobic zone 322 is flush with the lowest liquid level of the anoxic zone 31.

[0040] It can be understood that the sum of the height of the first aerobic zone 321 and the height of the anoxic zone 31 is the same as the height of the second aerobic zone 322 .

[0041] Furthermore, the aerobic pool 3 has an inlet 33 and an outlet 34, the first aerobic zone 321 is arranged near the inlet 33, that is, the first aerobic zone 321 and the anoxic zone 31 are arranged in the middle front section of the aerobic pool 3, and the second aerobic zone 322 is arranged near the outlet 34, that is, the second aerobic zone 322 is arranged at the end of the aerobic pool 3. At this time, on the basis of the anaerobic-anoxic-oxic (AAO) process, an anoxic-aerobic reaction section is added, that is, five biochemical reaction sections of anaerobic-anoxic-oxic-anoxic-oxic are formed, wherein the aerobic-anoxic-aerobic reaction section is simultaneously located in the aerobic pool 3, and a vertical A / O system with aerobic at the top and anoxic at the bottom is formed in the aerobic pool 3.

[0042] At this time, the ratio of the height of the anaerobic zone to the height of the first aerobic zone 321 is 1:1 to 1:3, with a simple structure and a reasonable layout.

[0043] According to some embodiments, the first aerobic zone 321 is disposed near the outlet 34, and the second aerobic zone 322 is disposed near the inlet 33. At this time, on the basis of the anaerobic-anoxic-oxic (AAO) process, an aerobic-anoxic reaction section is added, that is, five biochemical reaction sections of anaerobic-anoxic-aerobic-aerobic-anoxic are formed, wherein the aerobic-aerobic-anoxic reaction section is simultaneously located in the aerobic tank 3, and a vertical A / O system with aerobic at the top and anoxic at the bottom is formed in the aerobic tank 3.

[0044] It is understandable that the sludge in the aerobic tank 3 accumulates in the anoxic zone 31 for a long time, and will be hydrolyzed in the anaerobic / anoxic environment to produce volatile fatty acids, which can be used as a carbon source supplement, but the accumulation of sludge will also reduce the aeration effect in the aerobic tank 3, which is not conducive to the absorption of phosphorus by microorganisms and sludge discharge, and will reduce the pool capacity utilization rate of the aerobic tank 3. A second aeration device is provided at the bottom of the second aerobic zone 322, and the second aeration device is used to lift the sludge accumulated in the second aerobic zone 322.

[0045] In specific implementation, the second aeration device is the terminal aeration of the aerobic pool 3, and can be any suitable aeration structure arranged at the bottom of the pool, which can perform bottom aeration at the end of the aerobic pool 3. It can be arbitrarily selected according to specific use conditions, and no excessive restrictions are made here.

[0046] Exemplarily, the second aeration device is a floating boat aerator.

[0047] When used specifically, the second aeration device performs bottom aeration in the second aerobic zone 322, that is, performs bottom aeration at the outlet 34 of the aerobic pool 3. On the one hand, it can make up for the original defect of insufficient aeration, and at the same time, ensure the acidification of the sludge at the bottom of the front section of the aerobic pool 3 for carbon source supplementation; on the other hand, it is conducive to improving the efficiency of phosphorus absorption and reducing the phosphorus content of the effluent of the aerobic pool 3. In addition, the second aeration device can lift the accumulated sludge at the bottom of the second aerobic zone 322, which is conducive to stirring and plugging, and can discharge the deposited sludge at the bottom of the pool into the sedimentation pool 4 through the mixed liquid, which is convenient for sludge discharge, vacates part of the volume of the aerobic pool 3, and improves the sludge settling ratio and pool capacity utilization rate.

[0048] In this embodiment, a third aeration device 5 may be provided at the bottom of the anoxic zone 31 , and the third aeration device 5 is used to lift the sludge accumulated in the anoxic zone 31 .

[0049] In specific implementation, the third aeration device 5 can perform intermittent aeration through a valve. When self-produced carbon source is required, the third aeration device 5 does not aerate, so that the sludge in the aerobic pool 3 is precipitated in the anoxic zone 31, thereby hydrolyzing to generate volatile acid for carbon source supplementation. When the carbon source is sufficient and no additional carbon source is needed, the third aeration device 5 can perform pool bottom aeration, thereby overcoming the single aeration method in the aerobic pool 3 in the prior art, increasing the aeration range, and being able to perform full pool aeration of the aerobic pool 3 without dead ends, with good aeration effect, good sewage treatment effect, and effectively improving sewage treatment efficiency.

[0050] In specific implementation, since the aerobic pool 3 has a vertical A / O system, the anoxic zone 31 at the bottom of the aerobic pool 3 is maintained in an anaerobic / anoxic state. When the carbon source is sufficient and no additional carbon source is needed, the third aeration device 5 can perform bottom aeration. Figure 4 As shown in the figure, the sludge can be lifted. Due to the difference in density of the mixed liquid, the sludge in the middle of the bottom of the anoxic zone 31 is lifted by the compressed air, and the upper layer is aerated by the first aeration device, which is equivalent to a relay race. The density of the first aerobic zone 321 is smaller, so the sludge on both sides of the pool bottom flows toward the center of the aerobic pool 3, and the sludge at the bottom of the aerobic pool 3 moves upward continuously and is continuously transferred, so that the sludge at the bottom of the aerobic pool 3 is lifted, and the sludge along the Figure 4 On the other hand, it can provide a carbon source, and the sludge in the lower layer of the aerobic tank 3 is lifted along with the hydrolyzed volatile acid VFA during the lifting process, and the rising volatile fatty acids are used by the synchronous nitrification and denitrification microorganisms in the upper layer, thereby improving the sewage treatment effect.

[0051] The third aeration device 5 may be any suitable structure as long as it can perform micro-aeration at the bottom of the anoxic zone 31 .

[0052] In addition, the third aeration device 5 can be set at any suitable position of the anoxic zone 31, as long as it can aerate and lift the sludge. Preferably, the third aeration device 5 is located at the geometric center of the bottom of the anoxic zone 31, so that aeration is uniform and the sewage treatment effect is good.

[0053] Generally, there can be one aerobic pool 3. Of course, there can also be at least two aerobic pools 3, that is, multiple aerobic pools 3 are connected in sequence; along the water flow direction, the first of the multiple aerobic pools 3 is connected to the anoxic pool 2, and the last of the multiple aerobic pools 3 is connected to the sedimentation pool 4.

[0054] Embodiment 2

[0055] This embodiment also provides a sewage treatment system, including the above-mentioned sewage treatment device.

[0056] The sewage treatment device in this embodiment has the same structure as the sewage treatment device provided in Embodiment 1, and can bring the same or similar technical effects, which will not be described one by one here, and the details can be referred to the description of Embodiment 1.

[0057] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0058] The above description is only a specific embodiment of the present disclosure, so that those skilled in the art can understand or implement the present disclosure. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure will not be limited to the embodiments described herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A sewage treatment device, comprising an anaerobic tank (1), an anoxic tank (2), an aerobic tank (3) and a sedimentation tank (4) connected in sequence, wherein the sedimentation tank (4) is also connected to the anaerobic tank (1), characterized in that: A first aeration device is provided in the aerobic tank (3), an aeration port of the first aeration device is provided near the midline of the depth of the aerobic tank (3), and an aeration direction of the aeration port is opposite to the bottom of the aerobic tank (3), so as to form an aerobic zone (32) at least above the first aeration device and an anoxic zone (31) below the first aeration device, so that the sludge in the aerobic tank (3) is accumulated in the anoxic zone (31) to form a carbon source; The space occupied by the aerobic zone (32) in the aerobic pool (3) is larger than the space occupied by the anoxic zone (31) in the aerobic pool (3); The aerobic zone (32) includes a first aerobic zone (321) and a second aerobic zone (322); The first aeration device is arranged in the first aerobic zone (321), the anoxic zone (31) is located directly below the first aerobic zone (321), the highest liquid level of the second aerobic zone (322) is flush with the highest liquid level of the first aerobic zone (321), and the lowest liquid level of the second aerobic zone (322) is flush with the lowest liquid level of the anoxic zone (31); The height at which the aeration port of the first aeration device is located is 1 / 4 to 1 / 2 of the depth of the aerobic pool (3).

2. The sewage treatment device according to claim 1, characterized in that: The ratio of the space occupied by the anoxic zone (31) in the aerobic pool (3) to the space occupied by the aerobic zone (32) in the aerobic pool (3) is 1:5 to 1:

3.

3. The sewage treatment device according to claim 1, characterized in that: The aerobic pool (3) has an inlet (33) and an outlet (34), the first aerobic zone (321) is arranged close to the inlet (33), and the second aerobic zone (322) is arranged close to the outlet (34).

4. The sewage treatment device according to claim 3, characterized in that: A second aeration device is provided at the bottom of the second aerobic zone (322), and the second aeration device is used to lift the sludge accumulated in the second aerobic zone (322).

5. The sewage treatment device according to any one of claims 1 to 4, characterized in that: A third aeration device (5) is provided at the bottom of the anoxic zone (31), and the third aeration device (5) is used to lift the sludge accumulated in the anoxic zone (31).

6. The sewage treatment device according to claim 5, characterized in that: The third aeration device (5) is located at the geometric center of the bottom of the anoxic zone (31).

7. The sewage treatment device according to claim 5, characterized in that: There are at least two aerobic pools (3), and at least two aerobic pools (3) are connected in sequence; Along the water flow direction, the first of at least two aerobic tanks (3) is connected to the anoxic tank (2), and the last of at least two aerobic tanks (3) is connected to the sedimentation tank (4).

8. A sewage treatment system, characterized in that: It comprises the sewage treatment device as claimed in any one of claims 1 to 7.

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