Single-stage aerobic sbr
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- FANPING BRANCH OF HUANENG GANSU ENERGY DEVELOPMENT CO LTD
- Filing Date
- 2025-10-22
- Publication Date
- 2026-06-04
Smart Images
Figure CN2025129129_04062026_PF_FP_ABST
Abstract
Description
A single-stage aerobic SBR reactor Technical Field
[0001] This invention relates to the field of water treatment technology, and in particular to a single-stage aerobic SBR reactor. Background Technology
[0002] The pollutants in urban water, along with the corresponding chemicals added later, can often reach 4 to 5 times the concentration of the water after being concentrated in the cooling circulation system. This results in problems such as excessive nitrogen and phosphorus content and high concentration of inorganic salt ions in the circulating cooling water, which has a relatively adverse impact on its reuse or discharge.
[0003] Currently, most power plants use the effluent from the Xigu wastewater treatment plant as cooling circulating water, which saves water resources. However, during the use of circulating cooling water, phosphates accumulate due to evaporation and other reasons, causing the concentration of nutrients such as nitrogen and phosphorus in the water to gradually increase, which will lead to eutrophication of the water body. If the water is discharged in an emergency, it will bring the risk of environmental pollution.
[0004] The power plant's existing biological treatment process can efficiently remove other pollutants, but its phosphorus removal effect is unsatisfactory. An additional phosphorus removal process is needed to reduce the burden on subsequent biological treatment and mitigate the environmental risks associated with emissions. In the initial stages, the power plant's technicians used chemical and physical methods for phosphorus removal. While these methods offer high operational flexibility, high phosphorus removal efficiency, and simple operation, and the effluent meets the power plant's requirements, they are costly to operate, increase sludge volume by 60%–70%, and reduce sludge concentration by approximately 20%. Improper disposal of the resulting precipitates can cause secondary pollution. Furthermore, the addition of phosphorus removal agents will increase the heavy metal ion content in the water, affecting subsequent biological treatment processes and introducing new environmental risks. Summary of the Invention
[0005] In view of the problems existing in the prior art, the present invention is proposed.
[0006] Therefore, the present invention aims to solve the problem of high phosphorus content in the circulating cooling water of thermal power plants.
[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a single-stage aerobic SBR reactor, comprising: a reaction vessel, an inlet water assembly located on one side of the reaction vessel, a sludge discharge assembly located on the other side of the reaction vessel, a suspension plate located in the middle of the reaction vessel, and a suspension tank assembly located above the interior of the reaction vessel.
[0008] As a preferred embodiment of the single-stage aerobic SBR reactor described in this invention, the reaction vessel is a hollow structure composed of a bottom cone and a top cylinder.
[0009] In a preferred embodiment of the single-stage aerobic SBR reactor described in this invention, the water inlet assembly includes a water inlet tank located on one side of the reaction vessel. A water inlet pipe is fixedly connected inside the water inlet tank. The end of the water inlet pipe away from the water inlet tank is fixedly connected to the inside of the reaction vessel. A water pump, including a fixing plate, is fixedly connected to the water inlet pipe. The fixing plate is fixedly connected to the top of the reaction vessel. A motor is fixedly connected to the bottom of the fixing plate. A stirring shaft is fixedly connected to the output shaft end of the motor. A drain pipe is fixedly connected inside the reaction vessel and to the side of the stirring shaft.
[0010] As a preferred embodiment of the single-stage aerobic SBR reactor described in this invention, a spiral stirring blade is fixedly connected to the bottom of the stirring shaft, and the bottom of the drain pipe conforms to the bottom shape of the reaction vessel.
[0011] In a preferred embodiment of the single-stage aerobic SBR reactor described in this invention, the suspension plate is located inside the reaction vessel, the cross-sectional area of the suspension plate is smaller than the upper cross-sectional area of the reaction vessel, and the material density of the suspension plate is less than the density of water.
[0012] As a preferred embodiment of the single-stage aerobic SBR reactor of the present invention, wherein: a stirring positioning hole is provided in the middle of the suspension plate, and a sewage discharge positioning hole is provided at the top corner of the surface of the suspension plate.
[0013] As a preferred embodiment of the single-stage aerobic SBR reactor described in this invention, the suspension tank assembly includes an effluent tank one, an effluent pipe fixedly connected inside the effluent tank one, an effluent tank two located at the bottom of the end of the effluent pipe away from the effluent tank one, a plurality of counterweight balls fixedly connected inside the effluent tank two, a positioning block fixedly connected to the bottom of the effluent tank two, an air bladder attached to the lower part of the positioning block, an air inlet valve fixedly connected to the bottom of the air bladder, a connecting pipe fixedly connected to the bottom of the air inlet valve, and the end of the connecting pipe away from the air bladder located outside the reaction vessel.
[0014] In a preferred embodiment of the single-stage aerobic SBR reactor described in this invention, the counterweight balls are evenly distributed inside the second effluent tank, and the effluent pipe is located above the counterweight balls; the positioning block and the air bladder are fitted and engaged with each other.
[0015] In a preferred embodiment of the single-stage aerobic SBR reactor described in this invention, the stirring shaft passes through the stirring positioning hole on the suspension plate, and the drain pipe passes through the drain positioning hole on the suspension plate.
[0016] The beneficial effects of this invention are as follows: This single-stage aerobic SBR reactor utilizes acclimatized sludge to react with water, and accelerates the reaction between the sludge and water through a stirring shaft. Then, the treated water is recycled in layers using a suspension tank assembly. This process can efficiently remove phosphorus even when the influent nutrient concentration is low. Furthermore, this single-stage aerobic SBR phosphorus removal process is a phosphorus removal process that does not require an anaerobic section, has good phosphorus removal effect, is easy to operate, and is less affected by nitrates. The existing water quality and facility conditions of the power plant can meet the phosphorus removal requirements of this process. Attached Figure Description
[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:
[0018] Figure 1 is a schematic diagram of the overall structure of a single-stage aerobic SBR reactor provided by the present invention.
[0019] Figure 2 is a detailed internal structure diagram of a single-stage aerobic SBR reactor provided by the present invention;
[0020] Figure 3 is a cross-sectional view of a single-stage aerobic SBR reactor provided by the present invention;
[0021] Figure 4 is a detailed view of the suspension plate in a single-stage aerobic SBR reactor provided by the present invention.
[0022] Figure 5 is an enlarged detail view of part A in Figure 3 of a single-stage aerobic SBR reactor provided by the present invention;
[0023] Figure 6 is a schematic diagram of the operation mode of a single-stage aerobic SBR reactor provided by the present invention.
[0024] In the diagram: 100, reaction vessel; 101, water inlet assembly; 101a, water inlet tank; 101b, water inlet pipe; 101c, water pump; 102, wastewater discharge assembly; 102a, fixing plate; 102b, motor; 102c, stirring shaft; 102d, wastewater discharge pipe; 201, suspension plate; 201a, stirring positioning hole; 201b, wastewater discharge positioning hole; 202, suspension tank assembly; 202a, water outlet tank one; 202b, water outlet pipe; 202c, water outlet tank two; 202d, counterweight ball; 202e, positioning block; 202f, air bladder; 202g, air inlet valve; 202h, connecting pipe. Detailed Implementation
[0025] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
[0026] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.
[0027] Secondly, the present invention will be described in detail with reference to the schematic diagrams. When describing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure will be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include the three-dimensional spatial dimensions of length, width, and depth.
[0028] Furthermore, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places throughout this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that mutually excludes other embodiments.
[0029] Example 1
[0030] Referring to Figures 1-5, this embodiment provides a single-stage aerobic SBR reactor, including a reaction vessel 100. The bottom of the reaction vessel 100 is fixed on a horizontal platform or the ground. The reaction vessel 100 is a barrel structure with a sealed bottom and an open top.
[0031] Specifically, there is a water inlet assembly 101 located on one side of the reaction vessel 100, which is fixed on a horizontal platform or the ground; a wastewater discharge assembly 102 located on the other side of the reaction vessel 100, which is also fixed on a horizontal platform or the ground; a suspension plate 201 located in the middle of the reaction vessel 100, which is placed inside the reaction vessel 100; and a suspension tank assembly 202 located above the inside of the reaction vessel 100, which is placed inside the reaction vessel 100.
[0032] Furthermore, the reaction vessel 100 has a hollow structure consisting of a bottom cone and a top cylinder. This structure facilitates the accumulation of substances at the bottom of the reaction vessel 100 and makes it convenient to recycle the accumulated substances.
[0033] Preferably, the water inlet assembly 101 includes a water inlet tank 101a, which is a hollow cylindrical structure. The water inlet tank 101a is fixedly connected to a horizontal platform on one side of the reaction vessel 100. A water inlet pipe 101b is fixedly connected inside the water inlet tank 101a. One end of the water inlet pipe 101b away from the water inlet tank 101a is fixedly connected to the inside of the reaction vessel 100. A water pump 101c is fixedly connected to the water inlet pipe 101b. The water inlet tank 101a is transported to the inside of the reaction vessel 100 by the water pump 101c and then through the water inlet pipe 101b.
[0034] First, place and fix the reaction dish 100 and the water inlet tank 101a. Then, fix the inlet of the water inlet pipe 100b to the water inlet tank 101a and fix the outlet of the water inlet pipe 100b to the reaction dish 100. Install a water pump 101c on the water inlet pipe 101b above the water inlet tank 101a. Place the water to be treated in the water inlet tank 101a and start the water pump 101c. The water to be treated can be transferred to the inside of the reaction dish 100 for reaction. When the water to be treated enters the inside of the reaction dish 100, the suspension plate 201 floats up synchronously with the rise of the water level in the reaction dish 100.
[0035] Example 2
[0036] Referring to Figures 1-5, this is the second embodiment of the present invention, which is based on the previous embodiment and differs from the previous embodiment in that:
[0037] The sewage discharge component 102 includes a fixing plate 102a, which is usually the roof plate of the building structure or a panel with a certain load-bearing capacity, and is used to support and support the structure.
[0038] Specifically, a fixed plate 102a is fixedly connected to the top of the reaction vessel 100, and a motor 102b is fixedly connected to the bottom of the fixed plate 102a. A stirring shaft 102c is fixedly connected to the output shaft end of the motor 102b. When the motor 102b is started, the stirring shaft 102c can be driven to rotate evenly. A drain pipe 102d is fixedly connected inside the reaction vessel 100 and to one side of the stirring shaft 102c. The drain pipe 102d is used to discharge the material at the bottom of the reaction vessel 100.
[0039] Furthermore, a spiral stirring blade is fixedly connected to the bottom of the stirring shaft 102c, which can stir the water to be treated more evenly and quickly. The bottom of the drain pipe 102d is fitted to the bottom shape of the reaction vessel 100, which can better clean the material to be cleaned at the bottom of the reaction vessel 100.
[0040] When the water inside the reaction vessel 100 begins to react, aeration is required. This is done by connecting the drain pipe 102d to an air pump and installing an aeration head to accelerate the reaction. Before the reaction, sludge needs to be added to the bottom of the reaction vessel 100. A sludge pump is connected to the end of the drain pipe 102d away from the reaction vessel 100. The sludge at the other end of the sludge pump is taken from a domesticated reaction vessel that has been acclimatized and is in stable operating condition. This sludge is placed inside the reaction vessel 100 and reacts with the water to be treated in the reaction vessel 100. To speed up the reaction and make the reaction more efficient, the motor 102b is turned on, driving the stirring shaft 102c to stir the inside of the reaction vessel 100 and accelerate the aeration process.
[0041] By turning on the motor 102b, the stirring shaft 102c rotates synchronously with the motor 102b. At this time, the stirring shaft 102c stirs the water and sludge inside the reaction vessel 100. Since there is a suspension plate 201 floating above the water, the suspension plate 201 prevents the sludge from splashing during the rotation and also prevents the water from splashing indiscriminately.
[0042] Example 3
[0043] Referring to Figures 1-6, this is the third embodiment of the present invention, which is based on the previous embodiment and differs from the previous embodiment in that:
[0044] The suspension tank assembly 202 includes a water outlet tank 202a, the bottom of which is fixed to a horizontal platform or ground on the other side of the reaction vessel 100.
[0045] Specifically, an outlet pipe 202b is fixedly connected inside the outlet tank 202a. An outlet tank 202c is located at the bottom of the end of the outlet pipe 202b furthest from the outlet tank 202a. The outlet tank 202c floats on the surface of the water inside the reaction vessel 100. Multiple counterweight balls 202d are fixedly connected inside the outlet tank 202c. Placing the counterweight balls 202d inside the outlet tank 202c causes the top of the outlet tank 202c to be slightly below the water surface, allowing water to overflow into the outlet tank 202c. A positioning block 202e is fixedly connected to the bottom center of c. A spherical groove is opened at the bottom of the positioning block 202e. An air bag 202f is attached to the bottom of the positioning block 202e. An air inlet valve 202g is fixedly connected to the bottom of the air bag 202f. A connecting pipe 202h is fixedly connected to the bottom of the air inlet valve 202g. The end of the connecting pipe 202h away from the air bag 202f is located on the outside of the reaction vessel 100. An air inlet device is connected to the end of the connecting pipe 202h away from the air bag 202f for air intake treatment of the air bag 202f.
[0046] Furthermore, the counterweight balls 202d are evenly distributed inside the water outlet tank 202c, and the water outlet pipe 202b is located above the counterweight balls 202d. The positioning block 202e and the airbag 202f are engaged and locked together.
[0047] Preferably, the suspension plate 201 has a stirring positioning hole 201a at its center and a drain positioning hole 201b at the top corner of its surface. The stirring shaft 102c passes through the stirring positioning hole 201a on the suspension plate 201 and is rotatably connected to the suspension plate 201. The drain pipe 102d passes through the drain positioning hole 201b on the suspension plate 201 and is also rotatably connected to the suspension plate 201.
[0048] Once the reaction vessel 100 contains water to be treated, the operator injects air into the end of the connecting pipe 202h away from the airbag 202f. The air enters the airbag 202f through the air inlet valve 202g, and the airbag 202f engages with the positioning block 202e. The injected air balances the buoyancy of the water below the airbag 202f with the weight generated by the water outlet tank 202a and the counterweight ball 202d above the airbag 202f, thus maintaining the water outlet tank 202a at a constant level. Positionally, when the stirring shaft 102c rotates and drives the water inside the reaction vessel 100 to move, the water surface is turned over due to the force generated by the movement, and some water will flow into the water outlet tank 202a. Since the height of the water outlet tank 202a is higher than the height of the water outlet tank 202c, the water inside the water outlet tank 202a can be discharged into the water outlet tank 202c through the water outlet pipe 202b, so that the water outlet tank 202a and the counterweight ball 202d continue to maintain a relatively stable position.
[0049] The bottom of the suspension plate 201 is provided with a support leg of a certain height. As the water level inside the reaction vessel 100 gradually decreases, the height of the suspension plate 201 also decreases. However, when the support leg of the suspension plate 201 contacts the bottom of the reaction vessel 100, the position of the suspension plate 201 will not decrease.
[0050] This device employs a single-stage aerobic phosphorus removal process. In this process, the microorganisms in the water within the reaction vessel 100 are constantly in a cycle of abundant and scarce external carbon sources. A discharge device rich in floc-like microorganisms is connected to the end of the drain pipe 102d furthest from the reaction vessel 100, transporting these microorganisms into the interior of the reaction vessel 100. An air pump is then connected to the end of the drain pipe 102d furthest from the reaction vessel 100, and an aeration head is installed to aerate the interior of the reaction vessel 100. The operator then starts the motor 102b, causing the stirring shaft 102c to rotate at the bottom of the reaction vessel 100. This stirring promotes the dominance of the floc-like microorganisms and induces excessive phosphorus absorption. After the reaction is complete, the high-phosphorus sludge, with a density greater than water, settles to the bottom of the reaction vessel 100. The drain pipe 102d is then connected to a sludge pump to discharge this high-phosphorus sludge into the water body, thus completing the absorption and removal of phosphates from the wastewater.
[0051] A single-stage aerobic SBR reaction typically consists of four stages: influent, aeration reaction, drainage, and settling. The aeration reaction lasts 3.5 hours, drainage lasts 0.5 hours, and settling lasts 8 hours. After settling, sludge is discharged. Each reactor 100 is discharged once a day, and the sludge retention time for a single reactor 100 is 30 days. Each reactor 100 operates for two cycles per day (each cycle is 12 hours).
[0052] After water is injected into the reaction vessel 100 through the inlet pipe 101b and the pump 101c, soil rich in microorganisms is then injected into the reaction vessel 100 through the drain pipe 102d. Subsequently, the motor 102b is started to drive the stirring shaft 102c to rotate and stir. At this time, the water inside the reaction vessel 100 enters the initial aeration stage, and the organic nutrients in the water are relatively abundant. Microorganisms in the system decompose short-chain fatty acids (VFAs) through the tricarboxylic acid cycle (TCA cycle), using external carbon sources to provide energy and reducing power to convert them into poly(β-hydroxyalkanoates) (PHAs) for storage. Therefore, the COD concentration in the wastewater decreases rapidly. This process of oxidative decomposition of external carbon sources leads to a large consumption of dissolved oxygen in the water, causing the wastewater to exhibit a brief anaerobic state even during aeration. In the subsequent nutrient-deficient stage, the external carbon source is decomposed, and dissolved oxygen gradually returns to an aerobic state. Microorganisms decompose the stored polymers within themselves to provide energy and excessively absorb orthophosphates from the water, forming polyphosphate particles within their bodies.
[0053] After the aeration reaction is completed, a water pump 101c is also installed on the outlet pipe 202b, and then the air supply to the air bag 202f is stopped, causing the outlet tank 202a to continuously settle. During this process, the water pump 101c is turned on, and the water flowing out of the outlet tank 202a is transferred to the outlet tank 202c through the outlet pipe 202b. When the outlet tank 202a reaches its lowest point, that is, when the suspension plate 201 falls to the bottom of the reaction vessel 100 under the gravity of the outlet tank 202a and the counterweight ball 202d, the treated water inside the reaction vessel 100 is extracted.
[0054] Finally, sedimentation is carried out at the bottom of reaction vessel 100. After sedimentation, phosphorus-rich mud and other substances are discharged through sewage pipe 102d, thereby achieving the purpose of phosphorus removal from wastewater.
[0055] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape, and proportions of various elements, as well as parameter values (e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of the invention. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structurally equivalent but also equivalent in structure. Other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments without departing from the scope of the invention. Therefore, the present invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.
[0056] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the currently considered best mode for carrying out the invention, or those features that are not relevant to implementing the invention) may be omitted.
[0057] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.
[0058] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.
Claims
1. A single stage aerobic SBR reactor characterized in that: include, The reaction vessel (100), the water inlet assembly (101) located on one side of the reaction vessel (100), the drain assembly (102) located on the other side of the reaction vessel (100), the suspension plate (201) located in the middle of the reaction vessel (100), and the suspension tank assembly (202) located above the interior of the reaction vessel (100).
2. The single-stage aerobic SBR reactor according to claim 1, characterized in that: The reaction vessel (100) is a hollow structure consisting of a bottom cone and a top cylinder.
3. The single-stage aerobic SBR reactor according to claim 2, characterized in that: The water inlet assembly (101) includes a water inlet tank (101a), which is located on one side of the reaction vessel (100). A water inlet pipe (101b) is fixedly connected inside the water inlet tank (101a). One end of the water inlet pipe (101b) away from the water inlet tank (101a) is fixedly connected to the inside of the reaction vessel (100). A water pump (101c) is fixedly connected to the water inlet pipe (101b).
4. The single-stage aerobic SBR reactor according to any one of claim 3, characterized in that: The sewage discharge assembly (102) includes a fixing plate (102a), which is fixedly connected to the top of the reaction vessel (100). A motor (102b) is fixedly connected to the bottom of the fixing plate (102a). A stirring shaft (102c) is fixedly connected to the output shaft end of the motor (102b). A sewage discharge pipe (102d) is fixedly connected inside the reaction vessel (100) and to one side of the stirring shaft (102c).
5. The single-stage aerobic SBR reactor according to claim 4, characterized in that: The bottom of the stirring shaft (102c) is fixedly connected with a spiral stirring blade, and the bottom of the drain pipe (102d) conforms to the bottom shape of the reaction vessel (100).
6. The single-stage aerobic SBR reactor according to claim 5, characterized in that: The suspension plate (201) is located inside the reaction vessel (100). The cross-sectional area of the suspension plate (201) is smaller than the upper cross-sectional area of the reaction vessel (100). The material density of the suspension plate (201) is less than the density of water.
7. The single-stage aerobic SBR reactor according to claim 6, characterized in that: The suspension plate (201) has a stirring positioning hole (201a) in the middle and a sewage positioning hole (201b) at the top corner of the surface of the suspension plate (201).
8. The single-stage aerobic SBR reactor according to any one of claims 1 to 7, characterized in that: The suspension tank assembly (202) includes a first outlet tank (202a), an outlet pipe (202b) is fixedly connected inside the first outlet tank (202a), a second outlet tank (202c) is provided at the bottom of the end of the outlet pipe (202b) away from the first outlet tank (202a), a plurality of counterweight balls (202d) are fixedly connected inside the second outlet tank (202c), a positioning block (202e) is fixedly connected to the bottom of the second outlet tank (202c), an air bag (202f) is attached to the bottom of the positioning block (202e), an air inlet valve (202g) is fixedly connected to the bottom of the air inlet valve (202g), a connecting pipe (202h) is fixedly connected to the bottom of the air inlet valve (202g), and the end of the connecting pipe (202h) away from the air bag (202f) is located on the outside of the reaction vessel (100).
9. The single-stage aerobic SBR reactor according to claim 8, characterized in that: The counterweight balls (202d) are evenly distributed inside the water outlet tank (202c), and the water outlet pipe (202b) is located above the counterweight balls (202d). The positioning block (202e) and the airbag (202f) are engaged and locked together.
10. The single-stage aerobic SBR reactor according to claim 7, characterized in that: The stirring shaft (102c) passes through the stirring positioning hole (201a) on the suspension plate (201), and the drain pipe (102d) passes through the drain positioning hole (201b) on the suspension plate (201).