Activated sludge process sewage pretreatment tank

Abstract

This invention provides an activated sludge wastewater pretreatment tank, belonging to the field of wastewater treatment technology. The tank includes a tank body with several aeration pipes arranged on the inner bottom surface. One end of each aeration pipe is connected to one side of a main air pipe, and an air inlet pipe is located on the other side of the main air pipe. Several spray pipes are fixedly connected to the upper surface of each aeration pipe. This invention features high bubble turbulence during aeration, which facilitates uniform aeration and prevents clogging. Clogging does not occur after shutdown, and frequent maintenance of the aeration positions is not required during use, making it convenient to operate.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to an activated sludge wastewater pretreatment tank. Background Technology

[0002] The activated sludge process is an aerobic biological treatment method for wastewater, invented by Clark and Gage in 1912 in the UK. Today, the activated sludge process and its derivative improved processes are the most widely used methods for treating municipal wastewater. It can remove dissolved and colloidal biodegradable organic matter, as well as suspended solids and other substances that can be adsorbed by activated sludge, from wastewater, while also removing some phosphorus and nitrogen. Wastewater and activated sludge enter an aeration tank together to form a mixed liquor. Air is introduced into the mixed liquor to increase the dissolved oxygen content in the wastewater and to keep the mixed liquor in a state of vigorous agitation, allowing dissolved oxygen, activated sludge, and wastewater to mix and come into full contact, enabling the activated sludge reaction to proceed normally. In existing technologies for treating wastewater, prolonged aeration at aeration nozzles is used to maintain microorganisms at various water levels within the tank. However, when long-term shutdowns are required, the descending flocculent material can easily clog the aeration nozzles. In such cases, frequent cleaning and replacement of the aeration nozzles are necessary to ensure unobstructed operation of the aeration equipment. Due to the large number of aeration nozzles, cleaning and maintenance are inconvenient, consuming a significant amount of time and cost, thus causing inconvenience.

[0003] CN111689575A discloses a wastewater treatment device based on activated sludge process, including an aeration tank and a discharge pipe. The discharge pipe is located at the bottom of one side of the aeration tank. An air pipe is inserted into one side of the aeration tank, with its bottom end located at the bottom of the aeration tank. Air nozzles are evenly distributed on one side of the air pipe. A shell is fixedly connected to the middle of the inner wall of the bottom of the aeration tank. A push rod motor is installed inside the shell, with its top extending above the middle of the shell. An arc-shaped plate is fixedly connected to the top of the push rod motor. During the aeration stage, the push rod motor drives the arc-shaped plate in a reciprocating mechanical motion. A rubber ring seals the gap between the push rod motor and the shell. When pushed upwards, sludge is spread on the top surface of the arc-shaped plate, increasing the contact area between the sludge and air, accelerating the reaction rate. The striped texture further expands the top surface area of ​​the arc-shaped plate, optimizing the spreading effect. Analysis revealed that the device disclosed in this document cannot solve the above problems, hence this invention is proposed. Summary of the Invention

[0004] This invention provides an activated sludge wastewater pretreatment tank, with the aim of solving at least one of the technical problems of the prior art mentioned in the background section.

[0005] The present invention provides the following technical solution to achieve the above objectives:

[0006] An activated sludge wastewater pretreatment tank includes a tank body, with a plurality of aeration pipes arranged on the inner bottom surface of the tank body. One end of the plurality of aeration pipes is connected to one side of a main air pipe, and an air inlet pipe is arranged on the other side of the main air pipe. A plurality of spray pipes are fixedly connected to the upper surface of each aeration pipe.

[0007] The aforementioned activated sludge wastewater pretreatment tank has an agitation tank on one side of the tank body, an overflow port at the connection between the agitation tank and the tank body, and an agitation mechanism on the inner side of the agitation tank. The agitation mechanism includes a top frame fixedly installed on the upper end of the agitation tank, a motor installed on the upper surface of the top frame, an agitation shaft connected to the lower part of the motor, and agitation blades installed at the bottom end of the agitation shaft.

[0008] The aforementioned activated sludge wastewater pretreatment tank has a drain pipe installed on the outer surface of the tank body away from the agitation tank.

[0009] In the aforementioned activated sludge wastewater pretreatment tank, the port of the spray pipe is slidably fitted with a cover, the upper surface of the cover is movably fitted with a bucket-shaped plate, the edge of the bucket-shaped plate is provided with an end cap, and the lower side of the end cap is provided with a limiting edge; a flow guiding mechanism is fixedly provided on the lower surface of the bucket-shaped plate.

[0010] The aforementioned activated sludge wastewater pretreatment tank includes a guide bucket fixedly installed on the lower surface of a bucket-shaped plate, and a number of guide plates arranged in a ring array on the lower surface of the guide bucket; the side surface of the end cap has a number of oblique holes.

[0011] In the aforementioned activated sludge wastewater pretreatment tank, a sliding sleeve is provided at the lower end of the casing, and the sliding sleeve is fitted onto the outer surface of the spray pipe.

[0012] In the aforementioned activated sludge wastewater pretreatment tank, a guide ring is fixedly installed on the inner top surface of the casing, and an arc-shaped surface is formed on the lower surface of the guide ring. During aeration, the arc-shaped surface forms a meandering zone.

[0013] In the aforementioned activated sludge wastewater pretreatment tank, a guide bar is fixedly connected to the lower end of the guide ring. A sliding opening is provided on the outer surface of the guide bar. A fixing rod is fixedly installed on the inner wall of the spray pipe near the upper end. The fixing rod slides through the inner side of the sliding opening to guide the cover to slide up and down.

[0014] In the aforementioned activated sludge wastewater pretreatment tank, the upper surface of the casing is provided with several baffles around the bucket-shaped plate, and a sealing mechanism is provided on the side of the baffle away from the bucket-shaped plate, which blocks the through holes provided on the upper surface of the casing.

[0015] In the aforementioned activated sludge wastewater pretreatment tank, the sealing mechanism includes several connecting frames fixedly connected to the lower side of the baffle. A connecting column is provided on the upper surface of the connecting frame, and a sealing head is provided at the upper end of the connecting column. The sealing head is slidably inserted into the inner side of the through hole. The ends of the several connecting frames are connected to a reinforcing frame, and a limit block is provided on the upper surface of the reinforcing frame.

[0016] Beneficial effects

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. When gas is ejected from the nozzle, the cover will be pushed upward. Correspondingly, the fixing rod moves downward along the inner side of the sliding port. The guide bar prevents the cover from moving upward too much and detaching from the nozzle port. Due to the continuous impact of the gas, the bucket plate moves upward and the end cap moves upward at the same time. The oblique hole on the end cap is exposed to the outside. After the gas is discharged, it is blocked by the baffle and most of it flows directly upward. At the baffle, due to the airflow, the sealing head is pushed upward and detached from the inside of the through hole. During this process, the baffle also moves upward at the same time. Therefore, gas will be ejected from the through holes on the top and sides. The distribution of bubbles in the middle and at the edges can ensure uniform aeration.

[0019] 2. The side-emitting bubbles of this invention can effectively expand the aeration range, thus reducing the number of aeration heads required compared to traditional aeration technologies, which is beneficial for later maintenance and management.

[0020] 3. In the aeration process of this invention, when the airflow impacts the guide plate, it guides the bucket-shaped plate to rotate. The guide bucket is used to guide the gas to be sprayed out towards the inclined hole. Therefore, during aeration, bubbles are generated at the bucket-shaped plate while it rotates. Not only are central bubbles generated, but also swirling bubbles are generated. Swirling bubbles have a certain lateral movement trajectory, which plays a role in disturbing the edge bubbles, thereby increasing the degree of turbulence during bubble production and facilitating uniform aeration in the tank.

[0021] 4. In this invention, when aeration stops, the bucket-shaped plate moves downward under the influence of gravity, and the cover also moves downward. The gradually settling flocculent impurities fall onto the upper surface of the bucket-shaped plate and the cover, and slide away along the inclined surface, effectively avoiding the problem of impurity accumulation. Impurities will not enter the through holes and inclined holes on the upper surface, so there will be no blockage problem when aeration resumes. The aeration head has a long service life, does not require frequent maintenance, and is convenient to use.

[0022] 5. The present invention exhibits a high degree of bubble disorder during aeration, which facilitates uniform aeration and prevents clogging. It does not cause clogging problems after shutdown and does not require frequent maintenance of the aeration position during use, making it convenient to use. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below only relate to some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of an activated sludge wastewater pretreatment tank according to the present invention;

[0025] Figure 2 This is a schematic diagram of the casing of an activated sludge wastewater pretreatment tank according to the present invention.

[0026] Figure 3 This is a cross-sectional view of the casing of an activated sludge wastewater pretreatment tank according to the present invention.

[0027] Figure 4 This invention relates to an activated sludge wastewater pretreatment tank. Figure 3 Enlarged view of point A in the middle;

[0028] Figure 5 This invention relates to an activated sludge wastewater pretreatment tank. Figure 3 Enlarged view at point B in the middle;

[0029] Figure 6 This is a schematic diagram of the hopper-shaped plate of an activated sludge wastewater pretreatment tank according to the present invention;

[0030] Figure 7 This is a schematic diagram of the sealing mechanism of an activated sludge wastewater pretreatment tank according to the present invention;

[0031] Figure 8 This is a schematic diagram from another perspective of an activated sludge wastewater pretreatment tank according to the present invention;

[0032] Figure 9 This is a cross-sectional view of the cover of an activated sludge wastewater pretreatment tank during aeration, according to the present invention.

[0033] Figure 10 This is a diagram showing the gas flow direction during aeration in an activated sludge wastewater pretreatment tank according to the present invention.

[0034] Figure 11 This invention relates to the bubble distribution during aeration in an activated sludge wastewater pretreatment tank. Figure 1 ;

[0035] Figure 12 This invention relates to the bubble distribution during aeration in an activated sludge wastewater pretreatment tank. Figure 2 .

[0036] Reference numerals in the attached diagram: 1-tank body; 2-aeration pipe; 3-drainage pipe; 4-spray pipe; 5-cover; 6-sliding sleeve; 7-guide ring; 8-arc-shaped surface; 9-guide bar; 10-sliding port; 11-fixing rod; 12-bucket-shaped plate; 13-end cap; 14-guide bucket; 15-guide plate; 16-limiting edge; 17-slanted hole; 18-baffle; 19-connecting frame; 20-reinforcing frame; 21-limiting block; 22-connecting column; 23-sealing head; 24-through hole; 25-main air pipe; 26-air inlet pipe; 27-stirring tank; 28-top frame; 29-stirring shaft; 30-stirring blade; 31-motor; 32-air inlet zone; 33-winding zone; 34-vortex zone; 35-central bubble; 36-edge bubble; 37-dissipating bubble; 38-swirling bubble. Detailed Implementation

[0037] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0038] It should be noted that in this invention: the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products, or devices; the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," "longitudinal," etc., indicate orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings. The terminology used is primarily for the purpose of better describing the invention and its embodiments, and is not intended to limit the indicated devices, elements, or components to having a specific orientation, or to construct and operate in a specific orientation. Terms such as "first," "second," etc., are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. Terms such as "installed," "set," "equipped with," "connected," "linked," "socketed," etc., should be interpreted broadly; for example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, elements, or components. Furthermore, some terms, in addition to indicating orientation or positional relationships, may also have other meanings; for example, the term "above" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this invention according to the specific circumstances.

[0039] Example. An activated sludge wastewater pretreatment tank, such as... Figure 8 The system includes a tank body 1, with several aeration pipes 2 installed on the inner bottom surface of the tank body 1. One end of each aeration pipe 2 is connected to one side of a main air pipe 25, and an air inlet pipe 26 is installed on the other side of the main air pipe 25. Several spray pipes 4 are fixedly connected to the upper surface of each aeration pipe 2. In use, a mixture of sewage and activated sludge is injected into the tank body 1, and the air inlet pipe 26 is opened. Gas enters the main air pipe 25 through the air inlet pipe 26, then enters each aeration pipe 2, and finally sprays out from the spray pipes 4 in the form of bubbles, thus initiating the activated sludge reaction.

[0040] A stirring tank 27 is provided on one side of the pool body 1, such as... Figure 1 An overflow port is provided at the connection between the agitation tank 27 and the tank body 1 to allow the recovered sludge water to overflow into the tank body 1. An agitation mechanism is installed inside the agitation tank 27. The agitation mechanism includes a top frame 28 fixedly installed at the upper end of the agitation tank. A motor 31 is mounted on the upper surface of the top frame 28, and a stirring shaft 29 is connected to the lower part of the motor 31. A stirring blade 30 is installed at the bottom end of the stirring shaft 29. By turning on the motor 31, the stirring shaft 29 and the stirring blade 30 are rotated, thereby mixing the recovered sludge.

[0041] A drain pipe 3 is provided on the outer surface of the pool body 1 away from the stirring pool 27. Water is discharged from the pool body 1 through the drain pipe 3.

[0042] The port of the ejector pipe 4 is slidably fitted with a cover 5, such as Figure 2 A funnel-shaped plate 12 is movably fitted onto the upper surface of the casing 5. An end cap 13 is provided at the edge of the funnel-shaped plate 12, and a limiting edge 16 is provided at the lower edge of the end cap 13. A flow guiding mechanism is fixedly provided on the lower surface of the funnel-shaped plate 12. The flow guiding mechanism includes a guide bucket 14 fixedly provided on the lower surface of the funnel-shaped plate 12, and a plurality of flow guiding plates 15 are provided on the lower surface of the guide bucket 14. The flow guiding plates 15 are arranged in a circular array. A plurality of oblique holes 17 are opened on the side surface of the end cap 13. Figure 6 , Figure 10 When the gas passes through the guide plate 15, it forms a vortex zone 34, which is guided into the inclined hole 17, and at the same time, the bucket-shaped plate 12 rotates.

[0043] A sliding sleeve 6 is provided at the lower end port of the cover 5, such as Figure 3 The sliding sleeve 6 is fitted onto the outer surface of the spray pipe 4. The sliding sleeve 6 improves the stability of the up-and-down movement of the cover 5 and can effectively reduce the problem of water seeping into the spray pipe 4.

[0044] A flow guide ring 7 is fixedly provided on the inner top surface of the cover 5, such as Figure 3 , Figure 5 , Figure 10The lower surface of the guide ring 7 has an arc-shaped surface 8, which forms a meandering zone 33 during aeration, guiding the airflow towards the vicinity of the through hole 24. A guide strip 9 is fixedly connected to the lower end of the guide ring 7, and a sliding opening 10 is formed on the outer surface of the guide strip 9. A fixing rod 11 is fixedly installed on the inner wall of the spray pipe 4 near the upper end. The fixing rod 11 slides through the inner side of the sliding opening 10, serving to guide the cover 5 to slide up and down.

[0045] The upper surface of the cover 5 is provided with a plurality of baffles 18 surrounding the funnel-shaped plate 12, such as Figure 3 , Figure 4 , Figure 7 A sealing mechanism is provided on the side of the baffle 18 away from the bucket-shaped plate 12. The sealing mechanism blocks the through hole 24 on the upper surface of the cover 5. The sealing mechanism includes several connecting frames 19 fixedly connected to the lower side of the baffle 18. A connecting post 22 is provided on the upper surface of the connecting frame 19. A sealing head 23 is provided at the upper end of the connecting post 22. The sealing head 23 is slidably inserted into the inner side of the through hole 24. The ends of the several connecting frames 19 are connected to a reinforcing frame 20. A limit block 21 is provided on the upper surface of the reinforcing frame 20. The outer edge of the guide ring 7 supports the lower side of the baffle 18 to prevent the baffle 18 from moving down excessively, thereby causing the sealing head 23 to disengage from the through hole 24.

[0046] The side surface of the cover 5 is also provided with through holes.

[0047] During use, when gas is ejected from the nozzle 4, i.e., gas enters from the air inlet 32, it will push the cover 5 upward. Conversely, the fixing rod 11 moves downward along the inner side of the sliding port 10. The guide strip 9 prevents the cover 5 from moving excessively upward and detaching from the nozzle 4 port. Due to the continuous impact of the gas, the bucket plate 12 moves upward, and the end cap 13 moves upward at the same time, exposing the oblique hole 17 on the end cap 13. After the gas is discharged, it is blocked by the baffle 18, and most of it flows directly upward. At the baffle 18, due to the airflow, the sealing head 23 is pushed upward and detaches from the inner side of the through hole 24. During this process, the baffle 18 also moves upward synchronously. Therefore, gas will be ejected from both the upper and side through holes 24. The distribution of central bubbles 35 and edge bubbles 36 can ensure uniform aeration. The side diffused bubbles 37 can effectively expand the aeration range. Therefore, compared with traditional aeration technology, it can effectively reduce the number of aeration heads and facilitate later maintenance and management. During aeration, when the airflow impacts the guide plate 15, it guides the funnel-shaped plate 12 to rotate. The guide bucket 14 guides the gas towards the inclined hole 17. Therefore, during aeration, bubbles are generated at the funnel-shaped plate 12 as it rotates. Not only are central bubbles 35 generated, but also swirling bubbles 38. The swirling bubbles 38 have a certain lateral movement trajectory, which disturbs the edge bubbles 36, thereby increasing the degree of turbulence during aeration and facilitating uniform aeration within the tank 1. When aeration stops, under the influence of gravity, the funnel-shaped plate 12 moves downward, and the cover 5 also moves downward. The gradually settling flocculent impurities fall onto the upper surfaces of the funnel-shaped plate 12 and the cover 5 and slide away along the inclined surfaces, effectively avoiding the problem of impurity accumulation. Impurities will not enter the through holes 24 and inclined holes 17 on the upper surface, so there will be no blockage problem when aeration resumes. The aeration head has a long service life, does not require frequent maintenance, and is convenient to use.

[0048] Obviously, the above description is only a part of the embodiments of the present invention, and not all of the embodiments. The above embodiments are not intended to limit the present invention, and various modifications and variations can be made to the present invention by those skilled in the art. Any combination, modification, equivalent substitution, improvement, and all other embodiments that can be made by those skilled in the art within the spirit and principles of the present invention should be within the protection scope of the present invention.

Claims

1. An activated sludge wastewater pretreatment tank, characterized in that: it includes a tank body (1), and a plurality of aeration pipes (2) are provided on the inner bottom surface of the tank body (1). One end of the plurality of aeration pipes (2) is connected to one side of a main air pipe (25), and an air inlet pipe (26) is provided on the other side of the main air pipe (25); a plurality of spray pipes (4) are fixedly connected to the upper surface of each aeration pipe (2). The port of the ejector pipe (4) is slidably fitted with a cover (5), and a bucket-shaped plate (12) is movably embedded on the upper surface of the cover (5). An end cap (13) is provided at the edge of the bucket-shaped plate (12), and a limiting edge (16) is provided on the lower side of the end cap (13). A flow guiding mechanism is fixedly provided on the lower surface of the bucket-shaped plate (12). The upper surface of the cover (5) is provided with a number of baffles (18) around the bucket-shaped plate (12). A sealing mechanism is provided on the side of the baffle (18) away from the bucket-shaped plate (12), and the sealing mechanism blocks the through hole (24) provided on the upper surface of the cover (5). The sealing mechanism includes several connecting frames (19) fixedly connected to the bottom of the baffle (18). A connecting column (22) is provided on the upper surface of the connecting frame (19). A sealing head (23) is provided at the upper end of the connecting column (22). The sealing head (23) is slidably inserted into the inside of the through hole (24). The ends of several connecting frames (19) are connected to a reinforcing frame (20). A limit block (21) is provided on the upper surface of the reinforcing frame (20).

2. The activated sludge wastewater pretreatment tank according to claim 1 is characterized in that: a stirring tank (27) is provided on one side of the tank body (1), an overflow port is provided at the connection between the stirring tank (27) and the tank body (1), a stirring mechanism is provided on the inner side of the stirring tank (27), the stirring mechanism includes a top frame (28) fixedly installed on the upper end of the stirring tank, a motor (31) is installed on the upper surface of the top frame (28), a stirring shaft (29) is connected to the lower part of the motor (31), and a stirring blade (30) is installed at the bottom end of the stirring shaft (29).

3. The activated sludge wastewater pretreatment tank according to claim 2 is characterized in that: a drain pipe (3) is provided on the outer surface of the tank body (1) away from the stirring tank (27).

4. The activated sludge wastewater pretreatment tank according to claim 1 is characterized in that: the flow guiding mechanism includes a guide bucket (14) fixedly disposed on the lower surface of the bucket-shaped plate (12), and a plurality of flow guiding plates (15) are disposed on the lower surface of the guide bucket (14), and the flow guiding plates (15) are arranged in a ring array; a plurality of oblique holes (17) are opened on the side surface of the end cap (13).

5. The activated sludge wastewater pretreatment tank according to claim 3 is characterized in that: a sliding sleeve (6) is provided at the lower end port of the cover (5), and the sliding sleeve (6) is sleeved on the outer surface of the spray pipe (4).

6. The activated sludge wastewater pretreatment tank according to claim 3 is characterized in that: a guide ring (7) is fixedly provided on the inner top surface of the cover (5), and an arc-shaped surface (8) is provided on the lower surface of the guide ring (7), and the arc-shaped surface (8) forms a meandering zone (33) during aeration.

7. The activated sludge wastewater pretreatment tank according to claim 6 is characterized in that: the lower end of the guide ring (7) is fixedly connected to a guide bar (9), the outer surface of the guide bar (9) is provided with a sliding opening (10), and a fixing rod (11) is fixedly provided on the inner wall of the spray pipe (4) near the upper end. The fixing rod (11) slides through the inner side of the sliding opening (10) to guide the cover (5) to slide up and down.

Images