Sewage treatment device

Abstract

The utility model relates to the technical field of sewage treatment, in particular to a sewage treatment device which comprises an aerobic tank and a sedimentation tank which are separated by a partition plate, the aerobic tank comprises a first tank body with a first accommodating cavity, a water inlet pipe is arranged on the first tank body, and a rotatable adjusting plate is arranged in the first accommodating cavity; an aeration assembly is arranged in the first accommodating cavity; the sedimentation tank comprises a second tank body with a second accommodating cavity, a water outlet pipe is arranged on the second tank body, and the first accommodating cavity is communicated with the second accommodating cavity through a communicating pipe; and the second tank body is also provided with a sludge discharge pipe for discharging sludge. According to the anaerobic ammonia oxidation sewage treatment device, the overall structure is simple, the first accommodating cavity can be divided into an oxygen-enriched area and an anoxic area by arranging the rotatable adjusting plate in the aerobic tank, and the anaerobic ammonia oxidation sewage treatment device has aerobic and anoxic environments and meets the sewage treatment requirements of an anaerobic ammonia oxidation process for high-ammonia-nitrogen organic wastewater such as kitchen garbage wastewater.

Description

Technical Field

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

[0002] Kitchen waste wastewater is a typical type of organic wastewater with high ammonia nitrogen and high concentration, with total nitrogen (TN, 2000-3000 mg / L) and ammonia nitrogen (NH4) content of 2000-3000 mg / L. + High concentrations of nitrogen (1500–2500 mg / L) and a low BOD5:TKN ratio (only 2:1–3:1) do not meet the COD / TKN requirements of traditional nitrification-denitrification processes. For kitchen waste wastewater with low COD / TKN ratios, traditional nitrification-denitrification processes require the addition of large amounts of carbon sources, leading to high denitrification costs and additional carbon emissions. Anaerobic ammonia oxidation (AAO) is a novel autotrophic denitrification process that does not require external carbon sources. This process requires that the influent COD / TKN ratio (BOD5:TKN) should not exceed 1; excessively high levels of organic pollutants (COD, BOD) in the wastewater are detrimental to total nitrogen removal. Therefore, for high-ammonia-nitrogen wastewater with high COD content (such as kitchen waste wastewater and landfill leachate), pretreatment is necessary to remove excessively high COD and BOD before using AAO.

[0003] Authorization announcement number CN214360840U and application number CN202022570919.8 disclose a pig farm wastewater treatment system, which includes a high-load activated sludge treatment unit. This unit comprises an aeration tank and a vertical flow sedimentation tank connected in sequence. The aeration tank has no packing material, avoiding system blockage and facilitating maintenance. In this system, the activated sludge concentration in the aeration tank is 8000–12000 mg / L, the air-to-water ratio is 10–15:1, the sludge return ratio is 100%–300%, and the total hydraulic retention time is 8–16 hours. The function of this high-load aerobic activated sludge unit is to remove a large amount of easily degradable organic matter generated from anaerobic treatment, reduce the denitrification load, and prevent nitrifying bacteria from being inhibited due to competition for dissolved oxygen.

[0004] For high-ammonia nitrogen wastewater such as kitchen wastewater and landfill leachate treated using anaerobic ammonia oxidation (ANAO), the high-load activated sludge treatment unit should remove as much total nitrogen as possible while removing easily degradable organic matter, and simultaneously, should not generate new nitrate nitrogen in the effluent to avoid adversely affecting subsequent ANAO. Existing technologies can only remove easily degradable organic matter, and the 100%–300% sludge return ratio leads to the enrichment of ammonia-oxidizing and nitrite-oxidizing bacteria in the activated sludge within the unit. Ammonia nitrogen in the wastewater is easily oxidized to nitrate nitrogen, resulting in increased nitrate nitrogen in the effluent, which negatively impacts the subsequent ANAO process and fails to meet the pretreatment requirements for high-ammonia nitrogen organic wastewater such as kitchen wastewater.

[0005] In summary, there is an urgent need for a wastewater treatment device with a simple structure that meets the requirements of anaerobic ammonia oxidation processes for high-ammonia nitrogen organic wastewater such as kitchen waste, in order to solve the problems existing in the current technology. Utility Model Content

[0006] The purpose of this invention is to provide a wastewater treatment device with a simple structure that meets the requirements of anaerobic ammonia oxidation processes for high-ammonia nitrogen organic wastewater such as kitchen waste. This device can simultaneously and efficiently remove easily degradable organic matter and total nitrogen from wastewater, without increasing the nitrate nitrogen concentration in the effluent, making it suitable for subsequent anaerobic ammonia oxidation treatment. The specific technical solution is as follows:

[0007] A wastewater treatment apparatus includes an aerobic tank and a sedimentation tank separated by a partition.

[0008] The aerobic tank includes a first tank body with a first receiving cavity, and an inlet pipe is provided on the first tank body for sewage to flow into the first receiving cavity; a rotatable adjusting plate is provided in the first receiving cavity, which can divide the first receiving cavity into an oxygen-rich zone and an oxygen-deficient zone; an aeration component is provided in the first receiving cavity, which is connected to an oxygen source to provide oxygen to the first receiving cavity.

[0009] The sedimentation tank includes a second tank body with a second receiving cavity, and an outlet pipe is provided on the second tank body for discharging water that has passed through the sewage treatment device from the second receiving cavity; the first receiving cavity and the second receiving cavity are connected by a connecting pipe; the second tank body is also provided with a sludge discharge pipe for discharging sludge.

[0010] Preferably, the inner wall of the first receiving cavity is provided with an arc-shaped groove that matches the rotation trajectory of the rotatable adjusting plate;

[0011] The rotatable adjustment plate is rotatably mounted on the inner wall of the first receiving cavity via a rotating shaft, and the rotatable adjustment plate is provided with a locking device that matches the arc-shaped groove.

[0012] Preferably, the rotatable adjustment plate can rotate at an angle of 0°-45° relative to the vertical plane via the rotation axis.

[0013] Preferably, the arc-shaped groove includes a plurality of locking points arranged in sequence; the locking device includes a mounting base and a pin, the mounting base is disposed on the rotatable adjusting plate, and the pin is slidably disposed on the mounting base and can be inserted into the locking points to fix the relative position of the rotatable adjusting plate and the first receiving cavity.

[0014] Preferably, the first receiving cavity is a rectangular cavity, and the rotatable adjusting plate is a rectangular plate. The minimum distance between the lower end of the rotatable adjusting plate and the bottom of the first receiving cavity is 15% of the height of the first receiving cavity; the maximum distance between the side wall of the rotatable adjusting plate and the side wall of the first receiving cavity does not exceed 5% of the width of the first receiving cavity. The length of the first receiving cavity is greater than or equal to the height of the first receiving cavity; and when the rotatable adjusting plate is perpendicular to the bottom plate of the first receiving cavity, the horizontal distance between the adjusting plate and the partition is 40% of the height of the first receiving cavity.

[0015] Preferably, the inlet pipe is connected to the upper part of the first receiving cavity; the upper end of the connecting pipe is connected to the upper part of the first receiving cavity, and the lower end of the connecting pipe is 0.5-1 meter away from the bottom of the second receiving cavity; the outlet pipe is connected to the upper part of the second receiving cavity; the bottom end of the connecting pipe is also provided with a baffle for changing the direction of liquid flow, and the diameter of the baffle is 2-5 times the diameter of the connecting pipe; the sludge discharge pipe is connected to the lower part of the second receiving cavity.

[0016] Preferably, at least one of the inlet pipe, outlet pipe, connecting pipe, and sludge discharge pipe is equipped with a control valve.

[0017] Preferably, the aeration assembly includes an air inlet pipe and an aeration disc, the aeration disc being disposed within the first accommodating cavity and located directly below the rotation center of the rotatable adjusting plate within the first accommodating cavity; the air inlet pipe is used to connect an oxygen source and the aeration disc.

[0018] Preferably, a power source is provided between the air inlet pipe and the oxygen source; the power source is a blower; there are multiple aeration discs, which are evenly distributed at the bottom of the first receiving cavity.

[0019] The advantages of applying the technical solution of this utility model are as follows: The wastewater treatment device of this utility model includes an aerobic tank and a sedimentation tank separated by a partition. The aerobic tank includes a first tank body with a first receiving cavity, an inlet pipe on the first tank body, and a rotatable adjusting plate inside the first receiving cavity; an aeration component is installed inside the first receiving cavity. The sedimentation tank includes a second tank body with a second receiving cavity, an outlet pipe on the second tank body, and the first receiving cavity and the second receiving cavity are connected by a connecting pipe; a sludge discharge pipe for discharging sludge is also provided on the second tank body. The overall structure of this utility model is simple, and by providing a rotatable adjusting plate inside the aerobic tank, the first receiving cavity can be divided into an oxygen-rich zone and an anoxic zone, providing both aerobic and anoxic environments, thus meeting the wastewater treatment requirements of anaerobic ammonia oxidation processes for high-ammonia nitrogen organic wastewater such as kitchen waste. In addition, the sludge in the sedimentation tank is not returned to the aerobic tank and is instead discharged as surplus sludge into a separate sludge dewatering device for dewatering treatment. This has two advantages: ① Compared with the traditional A / O process, it saves on the return mechanism, which can save on equipment investment and operation and maintenance costs; ② There is no external sludge return to the aerobic tank, and the hydraulic retention time (HRT) of the wastewater is 1 to 3 days, which is the same as the sludge retention time. This avoids the accumulation of nitrite-oxidizing bacteria in the aerobic tank, thereby preventing nitrite ions in the aerobic tank from being oxidized to nitrate by nitrite-oxidizing bacteria. The nitrate nitrogen in the effluent does not increase, which is beneficial to the operation of the subsequent anaerobic ammonia oxidation unit.

[0020] In addition to the objectives, features, and advantages described above, this utility model has other objectives, features, and advantages. The present utility model will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0021] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0022] Figure 1 This is a schematic diagram of the wastewater treatment device in the embodiment;

[0023] Figure 2 yes Figure 1 Top view;

[0024] Among them, 1. Aerobic tank, 1.1. First containment chamber; 2. Sedimentation tank, 2.1. Second containment chamber; 3. Baffle; 4. Inlet pipe; 5. Rotatable adjusting plate; 6. Aeration assembly, 6.1. Air inlet pipe, 6.2. Aeration disc, 6.3. Aeration pipe; 7. Outlet pipe; 8. Connecting pipe; 9. Sludge discharge pipe; 10. Arc-shaped trough, 10.1. Locking point; 11. Rotating shaft; 12. Locking device; 13. Control valve. Detailed Implementation

[0025] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered by the claims.

[0026] Example:

[0027] See Figure 1 and Figure 2 A wastewater treatment device, specifically a wastewater treatment device that meets the requirements of anaerobic ammonia oxidation process pretreatment for high-ammonia nitrogen organic wastewater such as kitchen waste wastewater. The wastewater treatment device includes an aerobic tank 1 and a sedimentation tank 2 separated by a partition 3, and the detailed structure is as follows:

[0028] The aerobic tank 1 includes a first tank body with a first receiving cavity 1.1. The first tank body is provided with an inlet pipe 4 for sewage to flow into the first receiving cavity 1.1. The first receiving cavity 1.1 is provided with a rotatable adjusting plate 5, which can divide the first receiving cavity 1.1 into an oxygen-rich zone and an oxygen-deficient zone. The first receiving cavity 1.1 is provided with an aeration assembly 6, which is connected to an oxygen source to provide oxygen to the first receiving cavity 1.1.

[0029] The sedimentation tank 2 includes a second tank body with a second receiving cavity 2.1. An outlet pipe 7 is provided on the second tank body for discharging water treated by the wastewater treatment device from the second receiving cavity 2.1. The first receiving cavity 1.1 and the second receiving cavity 2.1 are connected by a connecting pipe 8. A sludge discharge pipe 9 is also provided on the second tank body for discharging sludge. The sludge in the sedimentation tank is not returned to the aerobic tank and is entirely discharged as surplus sludge into a separate sludge dewatering device for dewatering. This has two advantages: ① Compared to the traditional A / O process, it saves on the return mechanism, reducing equipment investment and operating and maintenance costs; ② There is no external sludge return to the aerobic tank, and the hydraulic retention time (HRT) of the wastewater is 1-3 days, the same as the sludge retention time. This avoids the accumulation of nitrite-oxidizing bacteria in the aerobic tank, thus preventing nitrite ions in the aerobic tank from being oxidized to nitrate by nitrite-oxidizing bacteria. The nitrate nitrogen in the effluent does not increase, which is beneficial for the operation of the subsequent anaerobic ammonia oxidation unit.

[0030] In this preferred embodiment, the inner wall of the first receiving cavity 1.1 is provided with an arc-shaped groove 10 that matches the rotation trajectory of the rotatable adjusting plate 5, as detailed in [link to details]. Figure 1The arc-shaped groove 10 includes a plurality of locking points 10.1 arranged sequentially. The rotatable adjusting plate 5 is rotatably mounted on the inner wall of the first receiving cavity 1.1 via a rotating shaft 11 (in this embodiment, the rotating shaft is located in the middle part of the rotatable adjusting plate along the height direction of the first receiving cavity). The rotatable adjusting plate 5 is provided with a locking device 12 that matches the arc-shaped groove 10. More preferably, the locking device 12 includes a mounting base and a pin. The mounting base is disposed on the rotatable adjusting plate 5, and the pin is slidably disposed on the mounting base and can be inserted into the locking point 10.1 to fix the relative position of the rotatable adjusting plate 5 and the first receiving cavity 1.1. That is, when the pin is pulled out from the locking point, the rotatable adjusting plate can rotate around the rotating shaft; when the pin is inserted into the locking point, the rotatable adjusting plate cannot rotate around the rotating shaft, thereby achieving fixation between the rotatable adjusting plate and the inner wall of the first receiving cavity. In this embodiment, when the partition is perpendicular to the bottom of the first receiving cavity 1.1, the entire first receiving cavity 1.1 is an aerobic zone, and its function is solely to remove easily degradable organic matter (COD, BOD) under aerobic conditions. When the partition is not perpendicular to the bottom of the first receiving cavity 1.1, an aerobic zone and an anoxic zone are formed within the first receiving cavity 1.1, allowing for simultaneous removal of organic matter and denitrification. In a further preferred embodiment, the locking point is a groove structure, and the included angle between the centers of adjacent groove structures is 2°-10°.

[0031] In this embodiment, the length of the first receiving cavity 1.1 is greater than or equal to the height of the first receiving cavity 1.1; and when the rotatable adjusting plate 5 is perpendicular to the bottom plate of the first receiving cavity 1.1, the horizontal distance between the adjusting plate 5 and the partition 3 is 40% of the height of the first receiving cavity 1.1.

[0032] In this preferred embodiment, the rotatable adjustment plate 5 can rotate relative to the vertical plane at an angle of 0°-45° via the rotation shaft 11.

[0033] like Figure 1 As shown, the first receiving cavity 1.1 is a rectangular cavity, and the rotatable adjusting plate 5 is a rectangular plate. The minimum distance between the lower end of the rotatable adjusting plate 5 and the bottom of the first receiving cavity 1.1 is 15% of the height of the first receiving cavity 1.1; the maximum distance between the side wall of the rotatable adjusting plate 5 and the side wall of the first receiving cavity 1.1 does not exceed 5% of the width of the first receiving cavity 1.1. Furthermore, the width and height of the rotatable adjusting plate can be selected according to the actual application scenario.

[0034] like Figure 1As shown, the inlet pipe 4 is connected to the upper part of the first receiving cavity 1.1; the upper end of the connecting pipe 8 is connected to the upper part of the first receiving cavity 1.1, and the lower end of the connecting pipe 8 is 0.5-1 meter away from the bottom of the second receiving cavity 2.1, preferably 1 meter; the outlet pipe 7 is connected to the upper part of the second receiving cavity 2.1; and the sludge discharge pipe 9 is connected to the lower part of the second receiving cavity 2.1. At least one of the inlet pipe 4, outlet pipe 7, connecting pipe 8, and sludge discharge pipe 9 is equipped with a control valve 13, such as... Figure 1 and Figure 2 As shown, only the control valve 13 is shown on the sludge discharge pipe 9.

[0035] In addition, the bottom end of the connecting pipe is provided with a baffle for changing the direction of liquid flow. The baffle is mounted on the connecting pipe by a support frame. When the liquid enters the second receiving cavity from the connecting pipe, the liquid flow is diffused in all directions by the baffle to prevent the liquid flow from directly impacting the bottom of the second receiving cavity. Further preferably, the diameter of the baffle is 2-5 times the diameter of the outlet end of the connecting pipe (the specific size can be selected according to the actual situation).

[0036] Preferably, in this embodiment, the aeration assembly 6 includes an air inlet pipe 6.1 and an aeration disc 6.2. The aeration disc 6.2 is disposed within the first receiving cavity 1.1 and located directly below the rotation center of the rotatable adjusting plate 5 within the first receiving cavity. The air inlet pipe 6.1 connects the oxygen source and the aeration disc 6.2. Figure 1 and Figure 2 As shown, there are multiple aeration discs 6.2, which are evenly distributed at the bottom of the first receiving cavity. Figure 2 As shown, the aeration assembly 6 also includes aeration pipes 6.3, with multiple aeration pipes 6.3 arranged side-by-side at intervals and all connected to the air inlet pipe 6.1. Multiple aeration discs 6.2 are evenly arranged on the multiple aeration pipes 6.3, with adjacent aeration discs 6.2 spaced apart. In addition, a power source is provided between the air inlet pipe 6.1 and the oxygen source; the power source is a blower.

[0037] In this embodiment, the rotatable adjusting plate, water inlet pipe, air inlet pipe, aeration disc, aeration pipe, water outlet pipe, connecting pipe, sludge discharge pipe, rotating shaft and other components are preferably made of corrosion-resistant metals. The specific material selection can refer to the existing technology.

[0038] The specific application of the technical solution of this utility model is as follows:

[0039] The wastewater treatment device can operate in a continuous influent and continuous effluent mode. The hydraulic retention time (HRT) of the wastewater in the aerobic tank 1 is 1 to 3 days. The sludge obtained from solid-liquid separation in the sedimentation tank 2 is not returned to the aerobic tank 1. The combination of short retention time (HRT) and non-return of sludge avoids the accumulation of nitrite-oxidizing bacteria in the aerobic tank, thereby preventing nitrite ions in the aerobic tank from being oxidized to nitrate by nitrite-oxidizing bacteria.

[0040] The specific wastewater treatment process is as follows: Wastewater enters the first containment chamber 1.1 of the aerobic tank 1 through the inlet pipe 4, and mixes and contacts with the activated sludge in the first containment chamber 1.1; the blower operates, continuously aerating and oxygenating the first containment chamber 1.1 through the air inlet pipe 6.1, aeration pipe 6.3, and aeration disc 6.2; the angle of the baffle is adjusted, specifically: ① when the rotatable adjusting plate 5 is perpendicular to the bottom of the first containment chamber 1.1, the interior of the first containment chamber 1.1 is a uniformly mixed aeration tank, and the tank is in an aerobic state; ② the rotatable adjusting plate 5 is rotated so that there is a certain angle between the rotatable adjusting plate and the vertical plane (i.e., the angle formed by the rotatable adjusting plate 5 and the bottom of the first containment chamber 1.1), such as... Figure 1 As shown, the aeration rate per unit volume of mixed liquid contacted by the two sides of the rotatable regulating plate 5 can be different, thus creating a difference in dissolved oxygen. Adjusting it to a certain angle can make the left side of the rotatable regulating plate a high dissolved oxygen zone and the right side a low dissolved oxygen zone. When the dissolved oxygen on the right side of the rotatable regulating plate is lower than 0.5 mg / L, an anoxic zone can be formed on the right side. At this time, the first receiving cavity 1.1 simultaneously has both aerobic and anoxic environments. The wastewater treatment mechanism is: ① Organic matter in the wastewater is degraded into carbon dioxide and water by microorganisms under aerobic conditions. ① Ammonia nitrogen in wastewater is oxidized to nitrite nitrogen by ammonia-oxidizing bacteria. The generated nitrite nitrogen will not be further oxidized to nitrate nitrogen (the short HRT in the biological treatment tank and the non-recirculation of sludge prevent nitrite nitrogen from being further oxidized to nitrate nitrogen); ② In the anoxic zone on the right side of the rotatable regulating plate, under anoxic conditions, denitrifying bacteria in the activated sludge use the organic matter in the wastewater to carry out short-range denitrification to remove nitrite nitrogen from the wastewater, achieving the function of simultaneously removing organic matter and denitrification, without increasing nitrate nitrogen in the effluent.

[0041] Compared with the prior art, this embodiment has the following features and technical effects:

[0042] 1. In this embodiment, the rotatable adjusting plate 5 installed in the first containment cavity 1.1 of the aerobic tank 1 can realize multiple functional partitions in the reactor: ① When the partition is perpendicular to the bottom of the first containment cavity 1.1, the first containment cavity 1.1 is entirely an aerobic zone, and its function is only to remove easily degradable organic matter (COD, BOD) in an aerobic environment; ② When the partition is not perpendicular to the bottom of the first containment cavity 1.1, an aerobic zone and an anoxic zone are formed in the first containment cavity 1.1, which can simultaneously remove organic matter and denitrify.

[0043] Second, in this embodiment, the aerobic tank 1 has no external sludge recirculation (referring to sludge recirculated from the sedimentation tank to the aerobic tank) and no internal sludge recirculation (referring to the recirculation of mixed liquor from the anoxic zone to the aerobic zone within the reactor). Compared with the traditional A / O process, it saves the recirculation mechanism, which can save equipment investment and operation and maintenance costs.

[0044] Third, in this embodiment, there is no sludge recirculation in the aerobic tank 1, and the hydraulic retention time (HRT) of the wastewater is 1 to 3 days, which is the same as the sludge retention time. This avoids the accumulation of nitrite-oxidizing bacteria in the aerobic tank, thereby preventing nitrite ions in the aerobic tank from being oxidized to nitrate by nitrite-oxidizing bacteria. As a result, the nitrate nitrogen in the effluent does not increase, which is beneficial to the operation of the subsequent anaerobic ammonia oxidation unit.

[0045] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A wastewater treatment device, characterized in that, It includes an aerobic tank (1) and a sedimentation tank (2) separated by a partition (3); The aerobic tank (1) includes a first tank body with a first receiving cavity (1.1), and an inlet pipe (4) is provided on the first tank body for sewage to flow into the first receiving cavity (1.1); a rotatable adjusting plate (5) is provided in the first receiving cavity (1.1), and the rotatable adjusting plate (5) can divide the first receiving cavity (1.1) into an oxygen-rich zone and an oxygen-deficient zone; an aeration assembly (6) is provided in the first receiving cavity (1.1), and the aeration assembly (6) is connected to an oxygen source to provide oxygen to the first receiving cavity (1.1); The sedimentation tank (2) includes a second tank body with a second receiving cavity (2.1), and the second tank body is provided with an outlet pipe (7) for discharging water that has passed through the sewage treatment device from the second receiving cavity (2.1); the first receiving cavity (1.1) and the second receiving cavity (2.1) are connected by a connecting pipe (8); the second tank body is also provided with a sludge discharge pipe (9) for discharging sludge.

2. The wastewater treatment device according to claim 1, characterized in that, The inner wall of the first receiving cavity (1.1) is provided with an arc-shaped groove (10) that matches the rotation trajectory of the rotatable adjusting plate (5); The rotatable adjustment plate (5) is rotatably mounted on the inner wall of the first receiving cavity (1.1) via a rotating shaft (11), and the rotatable adjustment plate (5) is provided with a locking device (12) that matches the arc groove (10).

3. The wastewater treatment device according to claim 2, characterized in that, The rotatable adjustment plate (5) can rotate at an angle of 0°-45° relative to the vertical plane via the rotation shaft (11).

4. The wastewater treatment device according to claim 2, characterized in that, The arc-shaped groove (10) includes a plurality of locking points (10.1) arranged in sequence; the locking device (12) includes a mounting base and a pin. The mounting base is disposed on the rotatable adjusting plate (5), and the pin is slidably disposed on the mounting base and can be inserted into the locking point (10.1) to fix the relative position of the rotatable adjusting plate (5) and the first receiving cavity (1.1).

5. The wastewater treatment apparatus according to any one of claims 1-4, characterized in that, The first receiving cavity (1.1) is a rectangular cavity, and the rotatable adjustment plate (5) is a rectangular plate. The minimum distance between the lower end of the rotatable adjustment plate (5) and the bottom of the first receiving cavity (1.1) is 15% of the height of the first receiving cavity (1.1); the maximum distance between the side wall of the rotatable adjustment plate (5) and the side wall of the first receiving cavity (1.1) does not exceed 5% of the width of the first receiving cavity (1.1). The length of the first receiving cavity (1.1) is greater than or equal to the height of the first receiving cavity (1.1); and when the rotatable adjusting plate (5) is perpendicular to the bottom plate of the first receiving cavity (1.1), the horizontal distance between the adjusting plate (5) and the partition (3) is 40% of the height of the first receiving cavity (1.1).

6. The wastewater treatment apparatus according to any one of claims 1-4, characterized in that, The inlet pipe (4) is connected to the upper part of the first accommodating cavity (1.1); the upper end of the connecting pipe (8) is connected to the upper part of the first accommodating cavity (1.1), and the lower end of the connecting pipe (8) is 0.5-1 meter away from the bottom of the second accommodating cavity (2.1); the outlet pipe (7) is connected to the upper part of the second accommodating cavity (2.1); the bottom end of the connecting pipe (8) is also provided with a baffle for changing the direction of liquid flow, and the diameter of the baffle is 2-5 times the diameter of the connecting pipe; the sludge discharge pipe (9) is connected to the lower part of the second accommodating cavity (2.1).

7. The wastewater treatment device according to claim 6, characterized in that, At least one of the inlet pipe (4), outlet pipe (7), connecting pipe (8) and sludge discharge pipe (9) is equipped with a control valve (13).

8. The wastewater treatment apparatus according to any one of claims 1-4, characterized in that, The aeration assembly (6) includes an air inlet pipe (6.1) and an aeration disc (6.2). The aeration disc (6.2) is disposed in the first accommodating cavity (1.1) and located directly below the rotation center of the rotatable adjusting plate (5) that rotates within the first accommodating cavity. The air inlet pipe (6.1) is used to connect the oxygen source and the aeration disc (6.2).

9. The wastewater treatment apparatus according to claim 8, characterized in that, A power source is provided between the air intake pipe (6.1) and the oxygen source; the power source is a blower; The number of aeration discs (6.2) is multiple, and the multiple aeration discs (6.2) are evenly distributed at the bottom of the first receiving cavity.

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