Combined sewage secondary treatment device

Abstract

The utility model relates to the technical field of sewage treatment, and particularly discloses a combined sewage secondary treatment device which comprises a biochemical pool for sewage treatment and at least two sedimentation pools for sludge sedimentation, the biochemical pool is arranged in front of the sedimentation pools, a fixed distance is kept between the two sedimentation pools, and the biochemical pool is arranged in front of the sedimentation pools. A sludge return pump room is arranged at the interval and is used for pumping sludge; the biochemical tank comprises a tank body, one or more groups of aeration assemblies are arranged on one side, close to the sedimentation tank, of the inner side of the tank body, and each aeration assembly comprises a guide pipe arranged at a preset angle and a bubble opening formed in the guide pipe; through the combination of the biochemical tank and the sedimentation tank, during use, continuous aeration of the biochemical tank can be realized by using the aeration assembly, and meanwhile, the biochemical tank extends to the bottom of the sedimentation tank through the pipeline and is matched with the sludge scraping plate, so that the possibility that the sludge floats upwards after being settled is reduced through oxygen supply while the sludge is discharged.

Description

TECHNICAL FIELD

[0001] The utility model relates to sewage treatment technical field, concretely is a combined sewage secondary treatment device. BACKGROUND

[0002] Traditional secondary biochemical treatment system mainly comprises two treatment units of biochemical pool and secondary sedimentation tank, usually adopts plane dispersion arrangement form.

[0003] Process requirement improves: along with the sewage treatment process requirement unceasingly improves, the coefficient of variation increases, biochemical pool retention time increases, and secondary sedimentation tank surface hydraulic load reduces, leading to the increase of secondary treatment unit area.

[0004] In order to match secondary biochemical treatment, still need to configure blower room, deodorization facilities and distribution room and other subsidiary structures, these subsidiary structures also need to occupy part of sewage treatment plant land.

[0005] Urban sewage treatment plant is usually located in the city periphery or urban area, and serves urban sewage treatment, so that urban land is tight becomes the new influencing factor in the process of sewage treatment plant reconstruction and expansion.

[0006] In order to solve the problems existing in traditional sewage secondary biochemical treatment system, such as land area increase, land shortage, etc., based on this, the application provides a combined sewage secondary treatment device. INVENTION CONTENTS

[0007] In view of the deficiencies of the prior art, the utility model provides a combined sewage secondary treatment device, which solves the problems existing in the traditional sewage secondary biochemical treatment system, such as land area increase, land shortage, etc.

[0008] The combined sewage secondary treatment device of the utility model, including the biochemical pool for sewage treatment and the sedimentation tank for sludge sedimentation, and the biochemical pool is arranged in front of the sedimentation tank, and the sedimentation tank is at least two, and a fixed interval is kept between the two, and a sludge return pump room is installed at the interval for sludge suction.

[0009] The biochemical pool comprises a pool body, one side of the inner side of the pool body close to the sedimentation tank is provided with one or more groups of aeration assemblies, the aeration assembly comprises a guide pipe arranged at a preset angle and a bubble port arranged on the guide pipe, and is used for oxygen supply in the biochemical pool.

[0010] The sedimentation tank comprises a body, a group of transmission assemblies are arranged on the inner side of the body, a mud scraping plate is arranged at the transmission assembly, the mud scraping plate comprises a plate body, one or more oxygen supply ports are arranged on the top of the plate body, and the oxygen supply port extends to the inner side of the biochemical pool through an air pipe and is communicated with the guide pipe.

[0011] As a further improvement of the present application, the upper portion of the pool body is provided with a driving member, the bottom of the driving member is connected with a stirring plate through a connecting member, and the stirring plate is used for stirring the inside of the biochemical pool.

[0012] As a further improvement of the present application, the inside of the pool body is provided with a water inlet pipe for the introduction of sewage, and the bottom of the water inlet pipe extends to the bottom of the pool body.

[0013] As a further improvement of the present application, the bottom of the body of the sedimentation tank is provided with one or more mud outlets, the lower portion of the mud outlet is provided with a guide plate, a plurality of guide plates form a volume cavity, and a mud guide pipe is arranged at the volume cavity.

[0014] As a further improvement of the present application, the end of the two mud guide pipes close to each other extends to the sludge return pump house and is connected with the sludge return pump house.

[0015] As a further improvement of the present application, the other end of the sludge return pump house is connected with the biochemical pool through a pipeline for returning the sludge to the biochemical pool.

[0016] As a further improvement of the present application, the plate body of the mud scraping plate is provided with a top plate below the oxygen supply port, a through hole is formed between the top plate and the plate body, and a guide wheel is arranged, and the guide wheel is matched with the transmission assembly.

[0017] As a further improvement of the present application, the bottom of the plate body is provided with a groove upwardly formed, a scraper is arranged at the groove, the scraper has a plurality of scraper, and is in contact with the bottom of the body of the sedimentation tank, and the scraper is arranged at a preset angle.

[0018] As a further improvement of the present application, the aeration assembly further comprises a supporting member arranged between the sedimentation tank and the biochemical pool for supporting the sedimentation tank and the biochemical pool.

[0019] Compared with the prior art, the present application has the following advantages:

[0020] The combination of the biochemical pool and the sedimentation tank is arranged, in use, the use of the aeration assembly can realize the continuous aeration of the biochemical pool, at the same time, the pipeline extends to the bottom of the sedimentation tank, and cooperates with the mud scraping plate, so that the sludge can be discharged, and the possibility of the sludge floating after sedimentation is reduced by oxygen supply, at this time, only one set of the whole aeration assembly needs to be installed, the structure is simple, and the oxygen supply assembly does not need to be additionally arranged in the sedimentation tank, the efficiency of sludge sedimentation is improved, the needs of use are met, the combination of the sedimentation tank and the deepening tank is arranged, the plane splicing and the vertical stacking structure system are utilized, the land occupation of the sewage treatment plant is greatly saved, the land utilization rate is improved, the pipeline is reduced, and the energy consumption is saved. BRIEF DESCRIPTION OF DRAWINGS

[0021] The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:

[0022] Figure 1 It is a combined structure schematic view of the biochemical pool and the sedimentation pool of the utility model;

[0023] Figure 2 It is a front view structure schematic view of the biochemical pool of the utility model;

[0024] Figure 3 It is a combined structure schematic view of the biochemical pool and the aeration assembly of the utility model;

[0025] Figure 4 It is a combined structure schematic view of the sedimentation pool and the mud scraping plate of the utility model;

[0026] Figure 5 It is a three-dimensional structure schematic view of the mud scraping plate of the utility model;

[0027] Figure 6 It is a top view structure schematic view of the mud scraping plate of the utility model;

[0028] Figure 7 It is a combined structure schematic view of the utility model Figure 6 It is a B-B section structure schematic view of the utility model;

[0029] Figure 8 It is a structure flow chart of the sludge backflow and the pretreatment incoming water circulation line of the utility model;

[0030] Figure 9 It is a combined structure schematic view of the transport ramp, the deodorization equipment, the odor collection line, the air blower room and the power distribution room of the utility model;

[0031] Figure 10 It is a combined structure schematic view of the air blower room and the biochemical pool and the sedimentation pool of the utility model.

[0032] In the drawing: 1, biochemical pool; 2, sedimentation pool; 3, aeration assembly; 4, sludge backflow pump room; 5, mud scraping plate; 6, pretreatment incoming water circulation line; 7, sludge backflow route; 8, transport ramp; 9, deodorization equipment; 10, odor collection line; 11A, air blower room; 11B, power distribution room;

[0033] 11, pool body; 12, connecting piece; 13, stirring plate; 14, water inlet pipe; 15, driving piece;

[0034] 21, main body; 22, mud guide pipe; 23, air pipe; 24, transmission assembly; 25, mud outlet;

[0035] 31. Bubble port; 32. Conduit; 33. Support member;

[0036] 51. Plate body; 52. Oxygen supply port; 53. Top plate; 54. Guide wheel; 55. Scraper. DETAILED DESCRIPTION

[0037] The following diagrams illustrate various embodiments of the present invention. For clarity, many physical details will be included in the following description. However, it should be understood that these physical details are not intended to limit the present invention. In other words, in some embodiments of the present invention, these physical details are not essential. Furthermore, to simplify the illustrations, some commonly used structures and components are depicted in a simplified schematic manner.

[0038] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0039] See also Figures 1-7 The secondary sewage treatment system is a common process treatment unit in a sewage treatment plant. Conventional secondary biochemical treatment units are composed of two treatment units: biochemical pool 1 and secondary sedimentation tank, and are often arranged in a dispersed plane. With the continuous improvement of sewage treatment process requirements, the increase in the coefficient of variation, the increase in the residence time of biochemical pool 1, and the decrease in the surface hydraulic load of the secondary sedimentation tank, the area occupied by the secondary treatment unit has increased. At the same time, in order to support the secondary biochemical treatment, ancillary structures such as blower rooms, deodorization facilities and distribution rooms are also required. These ancillary structures also need to occupy part of the sewage treatment plant land. Urban sewage treatment plants are often located in the outskirts of cities or urban areas, serving urban sewage treatment, and urban land is tight; saving land has become a new influencing factor in the renovation and expansion of urban sewage treatment plants.

[0040] In order to solve the problems existing in the traditional sewage secondary biochemical treatment system, the present application provides a combined sewage secondary treatment device, including a biochemical tank 1 for sewage treatment and a sedimentation tank 2 for sludge sedimentation, and the biochemical tank 1 is arranged in front of the sedimentation tank 2. There are at least two sedimentation tanks 2, and a fixed distance is maintained between the two. A sludge return pump room 4 is installed at the distance for sludge suction;

[0041] The biochemical pool 1 includes a pool body 11. One or more aeration assemblies 3 are provided on the inner side of the pool body 11 near the sedimentation tank 2. The aeration assemblies 3 include a conduit 32 provided at a preset angle and a bubble port 31 provided on the conduit 32 for supplying oxygen to the biochemical pool 1.

[0042] The sedimentation tank 2 comprises a body 21, and a set of transmission assemblies 24 are arranged on the inner side of the body 21. A mud scraping plate 5 is arranged at the transmission assemblies 24, and the mud scraping plate 5 comprises a plate body 51, and one or more oxygen supply ports 52 are arranged on the top of the plate body 51. The oxygen supply ports 52 extend to the inner side of the biochemical tank 1 through an air pipe 23 and communicate with a guide pipe 32.

[0043] The biochemical tank 1 comprises a solid tank body 11, and one or more sets of aeration assemblies 3 are arranged on the inner side of the tank body 11 close to one side of the sedimentation tank 2. The tank body 11 is made of high-strength concrete material, and an anticorrosive coating is coated on the inside, so that the tank body 11 is not corroded by sewage in long-term use.

[0044] The aeration assembly 3 comprises a guide pipe 32 arranged at a preset angle and a bubble port 31 arranged on the guide pipe 32. The guide pipe 32 is made of high-corrosion-resistant stainless steel material, and the bubble port 31 is designed to ensure that bubbles are uniformly distributed in the biochemical tank 1 and sufficient oxygen is provided.

[0045] The sedimentation tank 2 comprises a solid body 21, and a set of transmission assemblies 24 are arranged on the inner side of the body 21. The body 21 is also made of high-strength concrete material, and an anticorrosive coating is coated on the inside, so that the body 21 is not corroded by sewage in long-term use.

[0046] The mud scraping plate 5 is arranged at the transmission assemblies 24, and the mud scraping plate 5 comprises a solid plate body 51, and one or more oxygen supply ports 52 are arranged on the top of the plate body 51. The oxygen supply ports 52 extend to the inner side of the biochemical tank 1 through an air pipe 23 and communicate with a guide pipe 32, so that sufficient oxygen can be obtained when the sludge is discharged, and the possibility of the sludge floating after sedimentation is reduced.

[0047] The sedimentation tank 2 has at least two, and a fixed interval is maintained between the two, and a sludge return pump house 4 is installed at the interval for sludge pumping. The sludge return pump house 4 uses a high-efficiency and energy-saving sewage pump to ensure that the sludge can be smoothly pumped and returned to the biochemical tank 1.

[0048] The aeration assembly 3 is started through the control panel, and the guide pipe 32 and the bubble port 31 continuously supply oxygen to the biochemical tank 1, so as to ensure the oxygen demand in the biochemical process.

[0049] The transmission assemblies 24 are started, and the mud scraping plate 5 moves along the inner wall of the sedimentation tank 2 to scrape the sedimented sludge to the sludge return pump house 4, and the sludge is pumped and returned to the biochemical tank 1 through the sludge return pump house 4.

[0050] The transmission assemblies 24 generally drive the chain with the driving motor, so that the mud scraping plate 5 reciprocates at the bottom of the sedimentation tank 2, and the movement speed is slow;

[0051] The oxygen supply ports 52 communicate with the guide pipe 32 in the biochemical tank 1 through the air pipe 23, so that sufficient oxygen can be obtained during the sedimentation of the sludge, and the possibility of the sludge floating after sedimentation is reduced.

[0052] The aeration assembly 3 includes a conduit 32 and a bubble port 31, which ensures uniform distribution of oxygen in the biochemical tank 1, improves oxygen utilization efficiency in the biochemical process, and further improves the sewage treatment efficiency.

[0053] The oxygen supply port 52 of the mud scraping plate 5 is communicated with the conduit 32 in the biochemical tank 1 through the air pipe 23, which ensures that the sludge can obtain sufficient oxygen during discharge, reduces the possibility of sludge precipitation and floating, and improves the efficiency of sludge precipitation.

[0054] The combination of the biochemical tank 1 and the sedimentation tank 2 is arranged through the plane splicing and vertical stacking structure system, which greatly saves the land occupation area of the sewage treatment plant and improves the land utilization rate.

[0055] The setting of the sludge return pump house 4 ensures that the sludge can flow smoothly to the biochemical tank 1, reducing the additional land requirement.

[0056] The overall aeration assembly 3 only needs to be installed in one group, and the structure is simple, without the need to increase the oxygen supply assembly in the sedimentation tank 2, reducing energy consumption.

[0057] The sludge return pump house 4 uses a high-efficiency and energy-saving sewage pump to ensure that the sludge can be smoothly pumped and returned to the biochemical tank 1, reducing energy consumption.

[0058] The upper portion of the pool body 11 is provided with a driving member 15, and the bottom of the driving member 15 is connected with a stirring plate 13 through a connecting piece 12. The stirring plate 13 is used for stirring the inside of the biochemical tank 1.

[0059] The inside of the pool body 11 is provided with a water inlet pipe 14 for the introduction of sewage, and the bottom of the water inlet pipe 14 extends to the bottom of the pool body 11.

[0060] The upper portion of the pool body 11 is provided with a driving member 15, and the driving member 15 adopts an electric motor. The bottom of the driving member 15 is connected with a stirring plate 13 through a connecting piece 12. The stirring plate 13 can efficiently stir the inside of the biochemical tank 1, ensuring that the organic matter and microorganisms in the sewage are fully mixed.

[0061] The inside of the pool body 11 is provided with a water inlet pipe 14 for the introduction of sewage, and the bottom of the water inlet pipe 14 extends to the bottom of the pool body 11. The water inlet pipe 14 is made of corrosion-resistant PVC material, which is smooth inside, reduces dirt adhesion, and ensures that the sewage can be uniformly distributed in the biochemical tank 1.

[0062] The driving member 15 is started through the control panel, and the driving member 15 drives the stirring plate 13 to rotate. The design of the stirring plate 13 ensures that it can cover most of the area of the biochemical tank 1 during rotation, achieving efficient stirring.

[0063] The stirring plate 13 rotates under the action of the driving member 15, cooperates with the aeration assembly 3, and fully mixes the sewage and microorganisms in the biochemical tank 1 through mechanical stirring, improves the efficiency of the biochemical process, and ensures that the organic matter and oxygen can fully contact.

[0064] The bottom of the water inlet pipe 14 extends to the bottom of the tank body 11, ensuring that the sewage can be uniformly introduced into the biochemical tank 1. The sewage is introduced into the biochemical tank 1 through the water inlet pipe 14. The design of the water inlet pipe 14 ensures that the sewage can be uniformly distributed, avoiding the phenomenon of local high or low concentration, and ensuring the stable progress of the biochemical process.

[0065] The bottom of the body 21 of the sedimentation tank 2 is provided with one or more mud outlets 25. A guide plate is arranged below the mud outlet 25. A plurality of guide plates form a volume cavity, and a mud guide pipe 22 is arranged at the volume cavity.

[0066] The two mud guide pipes 22 extend to the sludge return pump house 4 at one end close to each other and are connected with the sludge return pump house 4.

[0067] The other end of the sludge return pump house 4 is connected with the biochemical tank 1 through a pipeline for returning the sludge to the biochemical tank 1.

[0068] The bottom of the body 21 of the sedimentation tank 2 is provided with one or more mud outlets 25. A guide plate is arranged below the mud outlet 25. The guide plate is made of high-strength corrosion-resistant material. A plurality of guide plates form a volume cavity to ensure that the sludge can be smoothly discharged. A mud guide pipe 22 is arranged at the volume cavity. The mud guide pipe 22 is made of corrosion-resistant PVC material and has a smooth inner surface to reduce dirt adhesion. The two mud guide pipes 22 extend to the sludge return pump house 4 at one end close to each other and are connected with the sludge return pump house 4.

[0069] The sewage pump of the sludge return pump house 4 ensures that the sludge can be smoothly pumped and returned to the biochemical tank 1. The other end of the sludge return pump house 4 is connected with the biochemical tank 1 through a pipeline. The pipeline is made of corrosion-resistant steel pipe to ensure that the sludge can be smoothly returned to the biochemical tank 1.

[0070] The sewage pump of the sludge return pump house 4 is started through the control panel. The sludge flows from the mud outlet 25 of the sedimentation tank 2 through the guide plate into the mud guide pipe 22, then enters the sludge return pump house 4 through the mud guide pipe 22, and finally returns to the biochemical tank 1 through the pipeline, ensuring that the sludge can be recycled and improving the treatment efficiency.

[0071] The top plate 53 is arranged below the plate body 51 of the mud scraping plate 5 and is provided with a through hole between the plate body 51 and the top plate 53. A guide wheel 54 is arranged in the through hole and is matched with the transmission assembly 24.

[0072] The bottom of the plate body 51 is provided with a recess upwardly opened, and the recess is provided with a plurality of scrapers 55 in contact with the bottom of the body 21 of the sedimentation tank 2. The scrapers 55 are inclined at a preset angle.

[0073] The aeration assembly 3 further comprises a support 33 arranged between the sedimentation tank 2 and the biochemical tank 1 for supporting the sedimentation tank 2 and the biochemical tank 1.

[0074] The plate body 51 of the mud scraping plate 5 is provided with a top plate 53 below the oxygen supply port 52, and a through hole is formed between the top plate 53 and the plate body 51, and a guide wheel 54 is arranged. The guide wheel 54 is matched with the transmission assembly 24, which ensures that the mud scraping plate 5 can move smoothly under the drive of the transmission assembly 24.

[0075] The bottom of the plate body 51 is provided with a recess upwardly opened, and the recess is provided with a plurality of scrapers 55 in contact with the bottom of the body 21 of the sedimentation tank 2. The scrapers 55 are inclined at a preset angle, which ensures that the sludge can be effectively scraped to the sludge outlet 25 during the scraping process.

[0076] The aeration assembly 3 further comprises a support 33 arranged between the sedimentation tank 2 and the biochemical tank 1 for supporting the sedimentation tank 2 and the biochemical tank 1. The support 33 is made of high-strength corrosion-resistant material, which ensures that the structure is stable and is not affected by corrosion during long-term use.

[0077] The transmission assembly 24 is started by the control panel, and the transmission assembly 24 drives the mud scraping plate 5 to move. The design of the top plate 53 and the guide wheel 54 ensures that the mud scraping plate 5 can move smoothly under the drive of the transmission assembly 24, and the design of the scraper 55 ensures that the sludge can be effectively scraped to the sludge outlet 25 during the movement.

[0078] The support 33 ensures that the structure of the sedimentation tank 2 and the biochemical tank 1 is stable, and is not affected by corrosion and vibration during long-term use, which ensures the stable operation of the whole system.

[0079] The scrapers 55 are inclined at a preset angle, which ensures that the sludge can be effectively scraped to the sludge outlet 25 during the scraping process, improves the efficiency of sludge sedimentation, avoids the accumulation of sludge in the sedimentation tank 2, and the design of the top plate 53 and the guide wheel 54 ensures that the mud scraping plate 5 can move smoothly under the drive of the transmission assembly 24, which improves the efficiency of mud scraping.

[0080] Referring to Figure 9 and Figure 10 During the process of sewage treatment, a transportation ramp 8 is further arranged on one side of the biochemical tank 1, and a power distribution room 11B and a blower room 11A are further arranged, and the blower room 11A is combined with the aeration assembly 3 to supply sufficient gas to the aeration assembly 3 to meet the needs of aeration;

[0081] At the same time, for the need of gas treatment during sewage treatment, a deodorization device 9, such as activated carbon for filtration and adsorption, a biological filter, plasma deodorization, or light catalysis and ozone oxidation, can be arranged at the biochemical tank 1 to form a stable deodorization need.

[0082] During the treatment of sewage, the sewage pretreatment inflow circulating line 6, the sludge backflow line 7, and the odor collection line 10 can be referred to Figure 8 to form a complete treatment need.

[0083] After the sewage treatment, the sewage enters a sludge treatment unit and a deep treatment unit for subsequent treatment needs; the sludge is collected, treated, and reused.

[0084] The above only describes the embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application should be included in the scope of the claims of the present application.

Claims

1. A combined secondary sewage treatment device, comprising a biochemical tank (1) for sewage treatment and a sedimentation tank (2) for sludge sedimentation, and the biochemical tank (1) is arranged in front of the sedimentation tank (2), the sedimentation tank (2) is at least two, and a fixed interval is kept between the two, and a sludge return pump house (4) is arranged at the interval for sludge pumping; Characterized in that: The biochemical tank (1) comprises a tank body (11), one or more groups of aeration assemblies (3) are arranged on the inner side of the tank body (11) close to the sedimentation tank (2), the aeration assembly (3) comprises a guide pipe (32) arranged at a preset angle and a bubble port (31) arranged on the guide pipe (32), and the bubble port (31) is used for oxygen supply in the biochemical tank (1); The sedimentation tank (2) comprises a body (21), a group of transmission assemblies (24) are arranged on the inner side of the body (21), a mud scraping plate (5) is arranged at the transmission assembly (24), the mud scraping plate (5) comprises a plate body (51), one or more oxygen supply ports (52) are arranged on the top of the plate body (51), the oxygen supply port (52) extends to the inner side of the biochemical tank (1) through an air pipe (23) and communicates with the guide pipe (32).

2. The combined sewage secondary treatment device according to claim 1, characterized in that: A driving member (15) is arranged above the tank body (11), a stirring plate (13) is connected to the bottom of the driving member (15) through a connecting member (12), and the stirring plate (13) is used for stirring the inner side of the biochemical tank (1).

3. The combined sewage secondary treatment device according to claim 1, characterized in that: A water inlet pipe (14) is arranged on the inner side of the tank body (11) for water inlet, and the bottom of the water inlet pipe (14) extends to the bottom of the tank body (11).

4. The combined sewage secondary treatment device of claim 1, wherein: One or more sludge outlets (25) are arranged on the bottom of the body (21) of the sedimentation tank (2), guide plates are arranged below the sludge outlets (25), a plurality of guide plates form a volume cavity, and a sludge guide pipe (22) is arranged at the volume cavity.

5. The combined sewage secondary treatment device according to claim 4, wherein: The two sludge guide pipes (22) extend to the sludge return pump house (4) at one end close to each other and are connected with the sludge return pump house (4).

6. The combined sewage secondary treatment device of claim 1, wherein: The other end of the sludge return pump house (4) is connected with the biochemical tank (1) through a pipeline for returning sludge to the biochemical tank (1).

7. The combined sewage secondary treatment device of claim 1, wherein: A top plate (53) is arranged below the oxygen supply port (52) of the plate body (51) of the mud scraping plate (5), a through hole is arranged between the top plate (53) and the plate body (51), and a guide wheel (54) is arranged, and the guide wheel (54) is matched with the transmission assembly (24).

8. The modular secondary wastewater treatment device of claim 1, wherein: A recess is arranged upward on the bottom of the plate body (51), a scraper (55) is arranged in the recess, the scraper (55) is a plurality of, and is in contact with the bottom of the body (21) of the sedimentation tank (2), and the scraper (55) is arranged at a preset angle.

9. The modular secondary wastewater treatment device of claim 1, wherein: The aeration assembly (3) further comprises a support member (33), the support member (33) is arranged between the sedimentation tank (2) and the biochemical tank (1), and is used for supporting the sedimentation tank (2) and the biochemical tank (1).

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