Sewage treatment biochemical pool

Abstract

The utility model discloses a sewage treatment biochemical pool which comprises a biochemical pool main body, a biochemical treatment chamber is arranged in the biochemical pool main body, three groups of settling chambers are arranged in the biochemical pool main body, the settling chambers are positioned below the biochemical treatment chamber, one-way flow components are arranged at the tops of the settling chambers, and the one-way flow components are communicated with the biochemical treatment chamber. The one-way flowing assembly is used for preventing impurities adsorbed by the activated sludge from flowing back during sedimentation. According to the utility model, the one-way flowing component is mounted, impurities adsorbed by activated sludge are filtered by the porous filter plate during sedimentation and then reach the two groups of overlapped one-way baffles, and the one-way baffles rotate downwards under the gravity action of downward sedimentation of the impurities adsorbed by the activated sludge; impurities adsorbed by the activated sludge smoothly enter the settling chamber through the one-way flowing assembly, and when water flows to cause backflow of the impurities adsorbed by the activated sludge, due to the fact that the one-way baffle is blocked by the porous filter plate above, the impurities adsorbed by the activated sludge cannot flow back.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, specifically to a wastewater treatment biochemical tank. Background Technology

[0002] A wastewater treatment biochemical tank is a type of tank used for wastewater treatment. During the wastewater treatment process, the wastewater is biodegraded and organic matter is removed. The principle of the biochemical tank is to use the biochemical reactions of microorganisms to convert organic matter in wastewater into harmless substances. Through this process, the water quality can be purified, and the treated wastewater can meet the discharge standards. At the same time, it can also reduce environmental pollution and protect water resources.

[0003] Patent document CN210764570U discloses a biological wastewater treatment tank, "including a biological tank, within which are arranged several partition components, arranged sequentially with decreasing heights; each partition component includes a partition plate and an overflow component sealed to and located above the partition plate; the partition plate divides the internal cavity of the biological tank into several non-communicating small cavities; the overflow component and the partition plate are detachably connected, the overflow component includes a bottom plate and an overflow wall, the bottom plate and the overflow wall are connected to form an overflow groove, the bottom plate has a sealing groove adapted to the partition plate, the inner wall of the sealing groove has a first elastic sealing layer, and the width of the sealing groove is equal to the width of the partition plate. This utility model can effectively avoid the problem of poor drainage caused by the presence of moss, which affects the purification efficiency, and also has the characteristics of simple structure." This document mainly considers the problem of poor drainage caused by the presence of moss and other foreign objects, but does not consider the problem of impurities flowing with the water flow and causing backflow when the wastewater treatment biological tank settles impurities adsorbed by activated sludge. Utility Model Content

[0004] The purpose of this utility model is to provide a wastewater treatment biochemical tank to solve the technical problem that impurities adsorbed by activated sludge will flow with the water flow and cause backflow when the wastewater treatment biochemical tank settles.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a wastewater treatment biochemical tank, comprising a biochemical tank body, wherein a biochemical treatment chamber is provided inside the biochemical tank body, and three sets of settling chambers are provided inside the biochemical tank body, wherein the settling chambers are located below the biochemical treatment chambers, and a one-way movable component is installed on the top of the settling chambers, wherein the one-way movable component is used to prevent impurities adsorbed by activated sludge from flowing back during settling;

[0006] The unidirectional moving component includes multiple sets of connecting plates, which are installed inside the biochemical treatment chamber. A fixed plate is installed on one side of the connecting plate. A unidirectional baffle is installed inside the fixed plate through a movable shaft. Two sets of unidirectional baffles are overlapped and installed in the middle of the two sets of fixed plates. A porous filter plate is installed in the middle of the two sets of fixed plates, and the porous filter plate is located above the two sets of unidirectional baffles.

[0007] Preferably, a sludge discharge branch pipe is installed through the bottom of the settling chamber, a sludge discharge control valve is installed at the bottom of the sludge discharge branch pipe, a sludge discharge main pipe is installed at the bottom of the sludge discharge control valve, and a sludge discharge pump is installed at one end of the sludge discharge main pipe, the sludge discharge pump being the power source for sludge discharge.

[0008] Preferably, the main body of the biochemical tank is equipped with a partition plate, and a water inlet pipe is installed on one side of the partition plate. The water inlet pipe penetrates the side wall of the main body of the biochemical tank and is installed inside the biochemical treatment chamber. A water inlet regulating valve is installed at one end of the water inlet pipe, and a water inlet pump is installed at the other end of the water inlet regulating valve. Multiple diversion pipes are installed at the bottom of the water inlet pipe, and sprinkler heads are installed at the bottom of the diversion pipes. The sprinkler heads are used to circulate water and oxygenate the water inside the biochemical treatment chamber.

[0009] Preferably, the interior of the main body of the biochemical tank is equipped with packing material to provide an attachment environment for microorganisms. The interior of the biochemical treatment chamber is equipped with a main air intake pipe that runs through the side wall of the main body of the biochemical tank. One end of the main air intake pipe is installed on one side of the partition plate and is located below the water inlet pipe. Multiple sets of branch air intake pipes are installed at the bottom of the main air intake pipe. Microporous aeration pipes are installed at the bottom of the branch air intake pipes. The microporous aeration pipes are used to increase the oxygen solubility in the water inside the biochemical treatment chamber to promote biodegradation in the water.

[0010] Preferably, the main body of the biological treatment tank has a filtration chamber inside, which is located on one side of the biological treatment chamber and above the sedimentation chamber. The filtration chamber is equipped with a filtration assembly, which is used to filter impurities in the discharged water.

[0011] Preferably, the filtration assembly includes multiple sets of fixing blocks, with some fixing blocks installed on one side of the partition plate and other fixing blocks installed on the inner side wall of the main body of the biological tank. An M-shaped filter plate is installed between the two sets of opposing fixing blocks. The M-shaped filter plate performs primary filtration of the sewage. A porous screen plate is installed inside the filtration chamber, and the porous screen plate is located above the M-shaped filter plate. The density of the porous screen plate is less than that of the M-shaped filter plate, and the porous screen plate performs secondary filtration of the sewage.

[0012] Preferably, the main body of the biochemical tank has an overflow chamber inside, the overflow chamber has an overflow trough inside, a water outlet pipe is installed through the bottom of the overflow trough, and a water outlet regulating valve is installed at the bottom of the water outlet pipe. The water outlet regulating valve is used to adjust the water flow of the water outlet pipe as needed.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] This invention, by installing a one-way movable component, prevents the backflow of impurities adsorbed by activated sludge during sedimentation in the wastewater treatment biological tank. The impurities adsorbed by the activated sludge inside the biological treatment chamber settle downwards into the sedimentation chamber under static conditions. The impurities first pass through a porous filter plate for filtration, and then reach two sets of overlapping one-way baffles. The one-way baffles, under the influence of gravity from the downward settling of the impurities, rotate downwards about the movable shaft inside the fixed plate, allowing the impurities to smoothly pass through the one-way movable component into the sedimentation chamber. When water flow causes backflow of the impurities adsorbed by the activated sludge, the two sets of overlapping one-way baffles are blocked by the upper porous filter plate, preventing them from rotating upwards and thus ensuring the wastewater treatment efficiency of the biological wastewater treatment tank. This solves the problem of impurities flowing with the water flow and causing backflow during the sedimentation of activated sludge in the wastewater treatment biological tank.

[0015] This invention, by installing a filtration assembly, allows the treated wastewater to pass through multiple sets of M-shaped filter plates for initial filtration before being discharged through the outlet pipe. This prevents suspended solids and other impurities from being discharged with the wastewater, improving the wastewater treatment efficiency of the biological wastewater treatment tank. The multiple sets of M-shaped filter plates increase the contact area between the wastewater and the plates, further enhancing filtration efficiency and ensuring the cleanliness of the treated wastewater. Subsequently, the wastewater flows upward through a porous screen plate. Because the density of the porous screen plate is lower than that of the M-shaped filter plates, it performs secondary filtration, further filtering out impurities that were not filtered by the M-shaped filter plates, thus further improving the wastewater treatment efficiency. This also enhances the convenience of the biological wastewater treatment tank, enabling precise positioning of the welding area and improving both accuracy and convenience, ultimately increasing the overall efficiency of the biological wastewater treatment tank. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0017] Figure 2 This is a top view of the structure of this utility model;

[0018] Figure 3 This is a cross-sectional structural diagram of the present invention;

[0019] Figure 4 This is a schematic diagram of the unidirectional movable component structure of this utility model;

[0020] Figure 5 This is a schematic diagram of the filter assembly structure of this utility model.

[0021] In the diagram: 1. Main body of the biological treatment tank; 2. Biological treatment chamber; 3. Settling chamber; 4. Connecting plate; 5. Fixing plate; 6. One-way baffle; 7. Porous filter plate; 8. Sludge discharge branch pipe; 9. Sludge discharge control valve; 10. Sludge discharge main pipe; 11. Sludge discharge pump; 12. Partition plate; 13. Inlet pipe; 14. Inlet regulating valve; 15. Inlet water pump; 16. Diversion pipe; 17. Sprinkler head; 18. Main air inlet pipe; 19. Packing material; 20. Inlet branch pipe; 21. Microporous aeration pipe; 22. Filter chamber; 23. Fixing block; 24. M-shaped filter plate; 25. Porous sieve plate; 26. Overflow chamber; 27. Overflow trough; 28. Outlet pipe; 29. ​​Outlet regulating valve. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5This utility model provides an embodiment: a sewage treatment biochemical tank, including a biochemical tank body 1, a biochemical treatment chamber 2 is provided inside the biochemical tank body 1, and three sets of settling chambers 3 are provided inside the biochemical tank body 1, with the settling chambers 3 located below the biochemical treatment chambers 2. A one-way movable component is installed on the top of the settling chambers 3, and the one-way movable component is used to prevent the impurities adsorbed by the activated sludge from flowing back during settling.

[0025] The unidirectional moving component includes multiple sets of connecting plates 4, and the connecting plates 4 are installed inside the biochemical treatment chamber 2. A fixing plate 5 is installed on one side of the connecting plate 4. A unidirectional baffle 6 is installed inside the fixing plate 5 through a movable shaft. Two sets of unidirectional baffles 6 are overlapped and installed in the middle of two sets of fixing plates 5. A porous filter plate 7 is installed in the middle of the two sets of fixing plates 5, and the porous filter plate 7 is located above the two sets of unidirectional baffles 6.

[0026] When using this wastewater treatment biological treatment tank, the unidirectional moving components can prevent the backflow of impurities adsorbed by the activated sludge during settling. The impurities adsorbed by the activated sludge inside the biological treatment chamber 2 settle downwards into the settling chamber 3 under static conditions. The impurities first pass through the porous filter plate 7 for filtration, and then reach two sets of overlapping unidirectional baffles 6. The unidirectional baffles 6 are subjected to the downward force of the adsorbed impurities settling downwards, and rotate downwards about the movable shaft inside the fixed plate 5, allowing the impurities adsorbed by the activated sludge to smoothly pass through the unidirectional moving components into the settling chamber 3. When the water flow causes the adsorbed impurities to flow back, the two sets of overlapping unidirectional baffles 6 are blocked by the upper porous filter plate 7, preventing the unidirectional baffles 6 from rotating upwards and preventing the backflow of the adsorbed impurities. This ensures the wastewater treatment efficiency of the biological treatment tank and solves the problem of impurities flowing with the water flow and causing backflow during the settling of adsorbed impurities in the wastewater treatment biological treatment tank.

[0027] A sludge discharge branch pipe 8 is installed through the bottom of the settling chamber 3. A sludge discharge control valve 9 is installed at the bottom of the sludge discharge branch pipe 8. A sludge discharge main pipe 10 is installed at the bottom of the sludge discharge control valve 9. A sludge discharge pump 11 is installed at one end of the sludge discharge main pipe 10. The sludge discharge pump 11 is the power source for sludge discharge. After the sludge discharge pump 11 is started, the sludge discharge control valve 9 at the bottom of the sludge discharge branch pipe 8 is opened. The impurities adsorbed by the activated sludge settling inside the settling chamber 3 enter the sludge discharge main pipe 10 through the sludge discharge branch pipe 8 and are discharged from the wastewater treatment biological treatment tank.

[0028] The main body 1 of the biochemical tank is equipped with a partition 12, which separates the biochemical treatment chamber 2 and the filtration chamber 22 inside the main body 1. A water inlet pipe 13 is installed on one side of the partition 12 and penetrates the side wall of the main body 1 of the biochemical tank. The water inlet pipe 13 is installed inside the biochemical treatment chamber 2. A water inlet regulating valve 14 is installed at one end of the water inlet pipe 13 and a water inlet pump 15 is installed at the other end of the water inlet regulating valve 14. The water inlet pump 15 is the power source of the water inlet pipe 13. After the water inlet pump 15 is started, the water inlet regulating valve 14 is opened, so that the water flow can reach the diversion pipe 16 from the water inlet pipe 13 and then spray out from the sprinkler head 17. Multiple diversion pipes 16 are installed at the bottom of the water inlet pipe 13. Sprinkler heads 17 are installed at the bottom of the diversion pipes 16. The sprinkler heads 17 are used to circulate water and oxygenate the water inside the biochemical treatment chamber 2.

[0029] The main body 1 of the biochemical tank is equipped with packing material 19, which provides an attachment environment for microorganisms. Microorganisms can form a biofilm by attaching to the surface of the packing material 19, thereby utilizing the organic matter in the wastewater as their nutrient source to achieve the purpose of wastewater treatment. The main air intake pipe 18 is installed through the interior of the biochemical treatment chamber 2, and the main air intake pipe 18 penetrates the side wall of the main body 1 of the biochemical tank. One end of the main air intake pipe 18 is installed on one side of the partition plate 12, and the main air intake pipe 18 is located below the water inlet pipe 13. Multiple sets of air intake branch pipes 20 are installed at the bottom of the main air intake pipe 18. Microporous aeration pipes 21 are installed at the bottom of the air intake branch pipes 20. Air passes through the main air intake pipe 18 to the air intake branch pipes 20 and then exits from the microporous aeration pipes 21. The microporous aeration pipes 21 are used to increase the oxygen solubility of the water in the biochemical treatment chamber 2 to promote the biodegradation in the water, promote the growth of microorganisms, and improve the wastewater treatment efficiency of the wastewater treatment biochemical tank.

[0030] The main body 1 of the biochemical tank has a filter chamber 22 inside. The filter chamber 22 is used to filter impurities in the discharged water to prevent blockage of the outlet pipe 28. The filter chamber 22 is located on one side of the biochemical treatment chamber 2 and above the sedimentation chamber 3. The filter chamber 22 is equipped with a filter assembly inside. The filter assembly is used to filter impurities in the discharged water.

[0031] The filtration assembly includes multiple sets of fixing blocks 23, with some fixing blocks 23 installed on one side of the partition plate 12 and others installed on the inner wall of the main body 1 of the biological treatment tank. An M-shaped filter plate 24 is installed between two sets of opposing fixing blocks 23, securing the M-shaped filter plate 24 to ensure its stability. The M-shaped filter plate 24 performs primary filtration of the wastewater. A porous screen plate 25 is installed inside the filtration chamber 22, positioned above the M-shaped filter plate 24. The density of the porous screen plate 25 is less than that of the M-shaped filter plate 24, and the porous screen plate 25 performs secondary filtration of the wastewater. Before the treated wastewater can be discharged from the outlet pipe 28, it must first pass through multiple sets of M-shaped filter plates 24 for primary filtration. This prevents suspended solids and other impurities in the wastewater from being discharged through the outlet pipe 28, thereby improving the wastewater treatment efficiency of the wastewater treatment biochemical tank. The multiple sets of M-shaped filter plates 24 increase the contact area between the wastewater and the M-shaped filter plates 24, improving filtration efficiency and ensuring the cleanliness of the treated wastewater. Subsequently, the wastewater flows upward through the porous screen plate 25. Since the density of the porous screen plate 25 is less than that of the M-shaped filter plate 24, the porous screen plate 25 performs secondary filtration on the wastewater, further filtering out impurities that were not filtered by the M-shaped filter plate 24, thereby further improving the wastewater treatment efficiency.

[0032] The main body 1 of the biochemical tank has an overflow chamber 26 inside. Water flows upward through the filter chamber 22 and enters the overflow trough 27 inside the overflow chamber 26. The overflow trough 27 is provided inside the overflow chamber 26. A water outlet pipe 28 is installed through the bottom of the overflow trough 27. A water outlet regulating valve 29 is installed at the bottom of the water outlet pipe 28. The water outlet regulating valve 29 is used to adjust the water flow of the water outlet pipe 28 according to the needs. When water needs to be discharged, the water outlet regulating valve 29 is opened, and the water flows out of the sewage treatment biochemical tank through the water outlet pipe 28.

[0033] Working principle: When using this wastewater treatment biological tank, air enters through the main air intake pipe 18 and reaches the branch air intake pipe 20, then exits through the microporous aeration pipe 21. The microporous aeration pipe 21 is used to increase the oxygen solubility in the water inside the biological treatment chamber 2 to promote biodegradation in the water, promote the growth of microorganisms, and improve the wastewater treatment efficiency of the wastewater treatment biological tank. After starting the inlet water pump 15, the inlet water regulating valve 14 is opened, so that the water flows from the inlet pipe 13 to the diversion pipe 16, and then sprays out from the sprinkler head 17. The sprinkler head 17 is used to circulate water and oxygenate the water inside the biological treatment chamber 2, continuously mixing and cultivating the wastewater and various microbial communities inside the wastewater treatment biological tank to form activated sludge. Utilizing the bio-coagulation, adsorption, and oxidation effects of the activated sludge, organic pollutants in the wastewater can be decomposed and removed.

[0034] The packing material 19 is used to provide an attachment environment for microorganisms. Microorganisms can form a biofilm by attaching to the surface of the packing material 19 and use the attached organic matter as an energy and nutrient source. By degrading the organic matter into simple inorganic matter, the purpose of sewage treatment is achieved. Inside the biochemical treatment chamber 2, microbial particles and adsorbents form a mixed suspension with water. Under static conditions, the mixture settles to the bottom of the settling chamber 3. After the sludge discharge pump 11 is started, the sludge discharge control valve 9 at the bottom of the sludge discharge branch pipe 8 is opened. The impurities adsorbed by the activated sludge settled inside the settling chamber 3 enter the sludge discharge main pipe 10 through the sludge discharge branch pipe 8 and are discharged from the sewage treatment biochemical tank.

[0035] Water flows into the filtration chamber 22 in a circulating manner. Before the treated wastewater can be discharged from the outlet pipe 28, it must first pass through multiple sets of M-shaped filter plates 24 for primary filtration. This prevents suspended solids and other impurities in the wastewater from being discharged through the outlet pipe 28, thereby improving the wastewater treatment efficiency of the wastewater treatment biological treatment tank. The multiple sets of M-shaped filter plates 24 increase the contact area between the wastewater and the M-shaped filter plates 24, improving filtration efficiency and ensuring the cleanliness of the treated wastewater. Subsequently, the wastewater flows upward through the porous screen plate 25. Since the density of the porous screen plate 25 is less than that of the M-shaped filter plate 24, the porous screen plate 25 performs secondary filtration on the wastewater, further filtering out impurities that were not filtered by the M-shaped filter plate 24, thereby further improving the wastewater treatment efficiency. The water flows upward through the filtration chamber 22 and enters the overflow trough 27 inside the overflow chamber 26. When it is time to discharge the water, the outlet regulating valve 29 is opened, and the water flows out of the wastewater treatment biological treatment tank through the outlet pipe 28.

[0036] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A wastewater treatment biological treatment tank, comprising a main body (1), characterized in that: The main body (1) of the biochemical tank has a biochemical treatment chamber (2) inside. The main body (1) of the biochemical tank has three sets of settling chambers (3) inside. The settling chambers (3) are located below the biochemical treatment chambers (2). A one-way moving component is installed on the top of the settling chambers (3). The one-way moving component is used to prevent the impurities adsorbed by the activated sludge from flowing back during settling. The unidirectional moving component includes multiple sets of connecting plates (4), and the connecting plates (4) are installed inside the biochemical treatment chamber (2). A fixing plate (5) is installed on one side of the connecting plate (4). A unidirectional baffle (6) is installed inside the fixing plate (5) through a movable shaft. Two sets of unidirectional baffles (6) are installed overlappingly in the middle of the two sets of fixing plates (5). A porous filter plate (7) is installed in the middle of the two sets of fixing plates (5), and the porous filter plate (7) is located above the two sets of unidirectional baffles (6).

2. The wastewater treatment biological treatment tank according to claim 1, characterized in that: A sludge discharge branch pipe (8) is installed through the bottom of the settling chamber (3). A sludge discharge control valve (9) is installed at the bottom of the sludge discharge branch pipe (8). A sludge discharge main pipe (10) is installed at the bottom of the sludge discharge control valve (9). A sludge discharge pump (11) is installed at one end of the sludge discharge main pipe (10). The sludge discharge pump (11) is the power source for sludge discharge.

3. The wastewater treatment biological treatment tank according to claim 1, characterized in that: The main body (1) of the biochemical tank is equipped with a partition plate (12). A water inlet pipe (13) is installed on one side of the partition plate (12) and the water inlet pipe (13) penetrates the side wall of the main body (1) of the biochemical tank. The water inlet pipe (13) is installed inside the biochemical treatment chamber (2). A water inlet regulating valve (14) is installed at one end of the water inlet pipe (13). A water inlet pump (15) is installed at one end of the water inlet pipe (14). Multiple diversion pipes (16) are installed at the bottom of the water inlet pipe (13). A water spray nozzle (17) is installed at the bottom of the diversion pipe (16). The water spray nozzle (17) is used to circulate water and oxygenate the water inside the biochemical treatment chamber (2).

4. A wastewater treatment biological treatment tank according to claim 1, characterized in that: The main body (1) of the biochemical tank is equipped with packing material (19), which is used to provide an attachment environment for microorganisms. The main air intake pipe (18) is installed through the interior of the biochemical treatment chamber (2), and the main air intake pipe (18) penetrates the side wall of the main body (1) of the biochemical tank. One end of the main air intake pipe (18) is installed on one side of the partition plate (12), and the main air intake pipe (18) is located above the packing material (19) and below the water inlet pipe (13). Multiple sets of air intake branch pipes (20) are installed at the bottom of the main air intake pipe (18). Microporous aeration pipes (21) are installed at the bottom of the air intake branch pipes (20). The microporous aeration pipes (21) are used to increase the oxygen solubility of the water in the biochemical treatment chamber (2) to promote the biodegradation in the water.

5. A wastewater treatment biological treatment tank according to claim 1, characterized in that: The main body (1) of the biochemical tank has a filter chamber (22) inside, and the filter chamber (22) is located on one side of the biochemical treatment chamber (2) and above the sedimentation chamber (3). The filter chamber (22) is equipped with a filter assembly, which is used to filter impurities in the discharged water.

6. A wastewater treatment biological treatment tank according to claim 5, characterized in that: The filter assembly includes multiple sets of fixed blocks (23), with some fixed blocks (23) installed on one side of the partition plate (12) and other fixed blocks (23) installed on the inner side wall of the main body (1) of the biological tank. An M-shaped filter plate (24) is installed between the two sets of opposing fixed blocks (23). The M-shaped filter plate (24) performs primary filtration of the sewage. A porous sieve plate (25) is installed inside the filter chamber (22), and the porous sieve plate (25) is located above the M-shaped filter plate (24). The density of the porous sieve plate (25) is less than the density of the M-shaped filter plate (24). The porous sieve plate (25) performs secondary filtration of the sewage.

7. A wastewater treatment biological treatment tank according to claim 1, characterized in that: The main body (1) of the biochemical tank has an overflow chamber (26) inside, and an overflow trough (27) is provided inside the overflow chamber (26). A water outlet pipe (28) is installed through the bottom of the overflow trough (27). A water outlet regulating valve (29) is installed at the bottom of the water outlet pipe (28). The water outlet regulating valve (29) is used to adjust the water flow of the water outlet pipe (28) according to the needs.

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