Rural domestic sewage treatment device based on SBR (sequencing batch reactor) process

Abstract

The utility model provides a rural domestic sewage treatment device based on an SBR (Sequencing Batch Reactor) process. The rural domestic sewage treatment device comprises an outer ring reaction tank, a sludge barrel, a sewage discharge pipe, a microbial preparation guide pipe, an extrusion assembly and a plurality of sludge purification chambers, an inner cavity is formed in the outer ring reaction tank, and a water inlet and a pressure relief opening are formed in the outer wall of the outer ring reaction tank; the sludge barrel is fixed in the center of the outer-ring reaction tank, an opening is formed in the upper end of the sludge barrel, the sewage discharge pipe is connected with the sludge barrel and the outer side of the outer-ring reaction tank, and one end of the microbial preparation conduit is communicated with the bottom of the sludge barrel; a plurality of sludge purification chambers are located in the inner cavity and fixed beside the sludge barrel, gaps communicated with the inner cavity of the outer ring reaction tank are formed in the surfaces of the sludge purification chambers, and the sludge purification chambers are communicated with the sludge barrel through connecting pipes; a driving mechanism of the extrusion assembly is fixed on the upper side of the outer ring reaction tank. The sewage contact efficiency is improved through the multi-layer staggered sludge purification chamber, and sludge reduction and treatment efficiency maximization are realized in combination with extrusion type sludge discharge and dynamic microorganism addition technologies.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, specifically to a rural domestic wastewater treatment device based on SBR technology, which is particularly suitable for rural domestic wastewater treatment scenarios. Background Technology

[0002] Improving the effectiveness of rural domestic sewage treatment has become an urgent problem to be solved. The SBR (Sequencing Batch Reactor) process, as a highly efficient and energy-saving sewage treatment technology, has broad application prospects.

[0003] The Sequencing Batch Reactor (SBR) is a highly effective wastewater treatment process. While its pollutant removal mechanism is very similar to that of traditional activated sludge processes, their operational methods differ significantly. Traditional activated sludge processes operate continuously, with wastewater flowing sequentially through different units within the system. In contrast, the SBR employs an intermittent process, with wastewater entering and exiting the system at different times. In this case, only one unit exists within the system, undertaking different treatment tasks at different times. The complete SBR process comprises five phases: influent, reaction, sedimentation, effluent, and idle. Compared to traditional activated sludge processes, the SBR has a simpler structure, requires less equipment space, and has lower operating costs.

[0004] SBR (Sequencing Batch Reactor) technology is a relatively mature wastewater treatment process. Existing wastewater treatment equipment using SBR technology achieves sludge-water separation through natural sedimentation, but it is difficult to achieve good results in a short period of time. Often, the sedimentation is insufficient, resulting in sludge in the effluent, causing sludge loss and poor effluent quality.

[0005] The most fundamental characteristic of SBR (Sequencing Batch Reactor) is that the treatment process is not continuous but intermittent and periodic. Wastewater is sequentially processed in batches, including influent, aeration, sedimentation, and effluent, and then the cycle repeats. In the early SBR process, influent, aeration, sedimentation, effluent, and sludge removal were all intermittent. Later, various modifications emerged, some changing the influent to continuous, some changing partial aeration to continuous, and some changing the effluent to continuous. However, as long as the cyclical operation characteristic of sequencing batch reactors is retained, it should be considered within the scope of the SBR process.

[0006] The SBR (Sequencing Batch Reactor) process is an intermittent reactor in which aeration and non-aeration alternate. Intermittent, unstable biological reactions replace steady-state biological reactions, eliminating the need for a secondary sedimentation tank in conventional processes. Biological reaction and sludge-water separation are completed in one area, thus saving land, reducing the number of structures, and lowering costs. The SBR process itself is a low-energy, environmentally friendly process, more suitable for small-volume operations. Its application in rural areas can be widely promoted, especially addressing the difficulties of small-volume operation and dispersed sites in rural single-household or small-scale wastewater projects. Combining the SBR process with solar power generation can better solve these problems.

[0007] Using actual domestic wastewater as the research object, the SBR method was employed to achieve rapid start-up of short-cut nitrification through alternating anoxic and aerobic operation modes. The SBR reactor was used to treat artificially prepared high-concentration organic wastewater, and the effects of different aeration times and aeration rates on the COD removal efficiency of the SBR reactor were investigated. The results showed that different aeration times and aeration rates had a significant impact on the COD removal efficiency of the wastewater. When the aeration time was less than 10 h, the longer the aeration time, the higher the COD removal rate; under normal circumstances, the larger the aeration rate, the better the COD removal effect.

[0008] SBR (Sequencing Batch Reactor) wastewater treatment technology is an activated sludge wastewater treatment technology that operates in an intermittent aeration mode. Unlike traditional wastewater treatment processes, SBR technology uses a time-segmented operation mode instead of a space-segmented operation mode, an unstable biochemical reaction instead of a steady-state biochemical reaction, and static ideal sedimentation instead of traditional dynamic sedimentation. Its main characteristics are its ordered and intermittent operation. The core of SBR technology is the SBR reactor, which integrates equalization, primary sedimentation, biodegradation, and secondary sedimentation functions into one tank, without a sludge return system.

[0009] The SBR (Sequencing Batch Reactor) operation consists of five basic stages: influent, reaction, sedimentation, effluent, and standby. One cycle is defined as the time from wastewater inflow to the end of the standby period. Within one cycle, all processes occur sequentially in a reaction tank equipped with aeration or stirring devices. This cycle is repeated continuously to achieve the goal of continuous wastewater treatment. The SBR process is simple and inexpensive.

[0010] Traditional SBR wastewater treatment processes have a total nitrogen removal efficiency of 60%-80%. When the total nitrogen content in the wastewater exceeds 250 mg / L, the total nitrogen content in the wastewater will exceed 50 mg / L after traditional SBR wastewater treatment, which does not meet the requirements of the national wastewater discharge standard GB27631-2011.

[0011] To address the shortcomings of traditional SBR wastewater treatment processes, such as low total nitrogen removal efficiency and various application purposes, many modified processes have emerged, including the Intermittent Circulating Extended Aeration System (ICEAS process), the Circulating Activated Sludge System (CASS process), the Circulating Activated Sludge Process (CAST process), the DAT-IAT process, and the UNITANK process. These modified SBR processes have addressed some of the shortcomings of traditional SBR processes, but they often suffer from high initial investment costs or high operating expenses. Utility Model Content

[0012] The purpose of this invention is to provide a rural domestic sewage treatment device based on SBR technology to solve the problems mentioned in the background art.

[0013] (1) How to improve the SBR device to achieve low energy consumption, high nitrogen and phosphorus removal efficiency and stable operation, which is particularly suitable for decentralized rural sewage treatment scenarios.

[0014] To achieve the above objectives, this utility model provides the following technical solution:

[0015] A rural domestic sewage treatment device based on SBR technology;

[0016] It includes an outer ring reaction tank, sludge tank, sewage pipe, microbial agent conduit, extrusion assembly, and several sludge purification chambers;

[0017] The outer ring reaction tank has an inner cavity for containing sewage, and the outer wall of the outer ring reaction tank has an inlet and a pressure relief port that communicate with the inner cavity.

[0018] The sludge bucket is fixed in the center of the outer ring reaction tank. The upper end of the sludge bucket has an opening. One end of the sewage pipe is connected to the bottom of the sludge bucket, and the other end of the sewage pipe is connected to the outside of the outer ring reaction tank. One end of the microbial preparation conduit is also connected to the bottom of the sludge bucket.

[0019] Several sludge purification chambers are located inside the inner cavity, and several sludge purification chambers are fixed to the side of the sludge bucket. The surface of the sludge purification chamber is provided with a gap that communicates with the inner cavity of the outer ring reaction tank. The sludge purification chamber and the sludge bucket are also connected by a connecting pipe.

[0020] The extrusion assembly includes a pressing cake and a driving mechanism. The driving mechanism is fixedly connected to the upper side of the outer ring reaction tank. The pressing cake extends into the sludge bucket from the upper opening. The outer contour of the pressing cake fits the cross-sectional shape of the inner cavity of the sludge bucket. The driving mechanism drives the pressing cake to reciprocate along the axial direction of the sludge bucket.

[0021] Based on the above technical solution, the present invention can be further improved as follows.

[0022] Furthermore, several sludge purification chambers are distributed in three layers along the axial direction of the sludge tank, and the three layers of sludge purification chambers are arranged in an alternating manner.

[0023] Furthermore, several sludge purification chambers on each floor are evenly distributed in a circular pattern along the axis of the sludge tank.

[0024] Furthermore, the extrusion assembly also includes a telescopic column, the drive mechanism is a geared motor, the inner wall of the sludge bucket is threaded, the pressed cake is threadedly engaged with the inner wall of the sludge bucket, and the geared motor and the pressed cake are connected and fixed by the telescopic column.

[0025] Furthermore, it also includes an aeration assembly, which includes an aeration pipeline, an air pump, and several aeration nozzles. The air pump is fixedly connected to the outside of the outer ring reaction tank, the main body of the aeration pipeline is arranged at the bottom of the inner cavity of the outer ring reaction tank, the beginning of the aeration pipeline is connected to the air outlet of the air pump, and several aeration nozzles are distributed on the aeration pipeline.

[0026] Furthermore, algae and other plants that promote the proliferation of microorganisms are cultivated in the inner cavity of the outer ring reaction tank.

[0027] With this structure, the rural domestic sewage treatment device based on the SBR process mainly consists of influent, sludge filling, and a micro-algae symbiosis system. First, sewage enters the outer ring reaction tank through the inlet. Once the outer ring reaction tank is full, the geared motor is activated to provide driving force for the sludge cake, which in turn drives the telescopic rod to press the sludge cake downwards. The sludge cake is then screwed tightly onto the bottom thread of the sludge bucket. During this process, the sewage in the sludge bucket is forced into the corresponding sludge chamber and agitated, keeping it in a continuous state of motion and forming a dynamic rotating layer. This greatly increases the contact area between the sludge and air, as well as treatment agents. Increasing the aeration intensity ensures that more oxygen dissolves into the sludge, meeting the metabolic needs of the microorganisms.

[0028] To improve the efficiency of activated sludge, the sludge purification chamber is divided into three layers, with eight chambers on each layer. During water injection, the sludge chambers on each layer are aligned to facilitate water injection. When wastewater reacts with sludge, the chambers on each layer are staggered, and the aeration effect is increased in conjunction with an air pump. The activated sludge is replaced when the reaction is completed.

[0029] The external detection unit detects the activated sludge that has been working in the sludge chamber. After being pressed by the extrusion assembly, the sludge is discharged through the sewage pipe. A portion of it is returned to the sludge purification chamber through the sludge bucket for secondary use. At the same time, the device will also periodically provide the microorganisms required for sewage purification to the activated sludge layer and the sewage reaction zone through the microbial agent conduit according to parameters such as sewage BOD5 and COD, so as to maintain the activity and working efficiency of the activated sludge.

[0030] After a period of time, once the wastewater meets the standards as determined by the testing unit, the pressure relief valve is opened, and the reclaimed water is discharged for use in agricultural irrigation and other applications. Finally, all waste sludge is transported to a sludge treatment plant, where it is processed into bricks for recycling.

[0031] Based on the main factors affecting microbial growth and propagation—pH, temperature, dissolved oxygen, nutrient solution concentration, growth factors, light, and auxiliary conditions—this rural domestic wastewater treatment device based on the SBR process can automatically regulate these indicators to provide a suitable temperature and pH environment for microbial and algal growth and operation. An air pump supplies oxygen and carbon dioxide to the inner tank, ensuring sufficient dissolved oxygen for microbial propagation. A natural wetland-like treatment area is located at the bottom of the outer ring reaction tank. By cultivating algae and other plants that promote microbial propagation, a symbiotic relationship is established, which, combined with the agitation of the sludge layer, significantly increases the microbial propagation rate. The sludge tank is removable for easy periodic cleaning and maintenance. Attached Figure Description

[0032] Figure 1 This is one of the perspective views of an embodiment of a rural domestic sewage treatment device based on the SBR process.

[0033] Figure 2 This is the second perspective view of an embodiment of a rural domestic sewage treatment device based on the SBR process (the side wall of the outer ring reaction tank is omitted in the figure to make the internal structure of the device clearer).

[0034] Figure 3 This is a perspective view of the sludge bucket, sewage pipe, microbial agent conduit, sludge purification chamber, and extrusion assembly in an embodiment of a rural domestic sewage treatment device based on the SBR process.

[0035] Figure 4 yes Figure 3 Sectional view along AA.

[0036] Figure 5 This is a perspective view of the aeration components in an embodiment of a rural domestic sewage treatment device based on the SBR process.

[0037] Explanation of the labels in the diagram:

[0038] Outer ring reaction tank - 100; Inner cavity - 110; Inlet - 120; Pressure relief port - 130; Working platform - 140; Sludge bucket - 200; Sewage pipe - 300; Microbial agent conduit - 400; Sludge purification chamber - 500; Connecting pipe - 510; Press cake - 610; Gear motor - 620; Telescopic column - 630; Plant - 700; Aeration pipeline - 810; Air pump - 820; Aeration nozzle - 830. Detailed Implementation

[0039] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0040] The terms “vertical,” “horizontal,” “left,” “right,” and similar expressions used in this document are for illustrative purposes only and do not represent the only possible implementation.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0042] Please refer to Figure 1 to Figure 5 .

[0043] This rural domestic sewage treatment device based on SBR technology includes an outer ring reaction tank 100, a sludge tank 200, a sewage discharge pipe 300, a microbial preparation conduit 400, a squeezing assembly, an aeration assembly, and twenty-four sludge purification chambers 500.

[0044] The outer ring reaction tank 100 has an inner cavity 110 for containing sewage. The outer wall of the outer ring reaction tank 100 has an inlet 120 and a pressure relief port 130 that communicate with the inner cavity 110.

[0045] The sludge bucket 200 is fixed at the center of the outer ring reaction tank 100. The upper end of the sludge bucket 200 is provided with an opening. One end of the sewage pipe 300 is connected to the bottom of the sludge bucket 200, and the other end of the sewage pipe 300 is connected to the outside of the outer ring reaction tank 100. One end of the microbial agent conduit 400 is also connected to the bottom of the sludge bucket 200, and the other end of the microbial agent conduit 400 is connected to an external microbial agent source.

[0046] All twenty-four sludge purification chambers 500 are located within the inner cavity 110. All sludge purification chambers 500 are fixed to the side of the sludge tank 200. The twenty-four sludge purification chambers 500 are distributed in three layers along the axial direction of the sludge tank 200. Each layer has eight sludge purification chambers 500. The eight sludge purification chambers 500 in each layer are evenly distributed in a circle along the axis of the sludge tank 200, and the three layers of sludge purification chambers 500 are staggered.

[0047] The sludge purification chamber 500 has a gap on its surface that communicates with the inner cavity 110 of the outer ring reaction tank 100. The sludge purification chamber 500 and the sludge bucket 200 are also connected by a connecting pipe 510.

[0048] The extrusion assembly includes a pressing cake 610, a telescopic column 630, and a drive mechanism. The drive mechanism is a geared motor 620, which is welded and fixed to the upper side of the outer ring reaction tank 100. The pressing cake 610 extends into the sludge tank 200 from the upper opening. The outer contour of the pressing cake 610 fits the cross-sectional shape of the inner cavity 110 of the sludge tank 200. The inner wall of the sludge tank 200 is threaded, and the pressing cake 610 and the inner wall of the sludge tank 200 are threadedly engaged. The geared motor 620 and the pressing cake 610 are connected and fixed through the telescopic column 630. The telescopic column 630 can freely extend and retract along the axial direction of the sludge tank, thereby rotating the geared motor 620 and driving the pressing cake 610 to reciprocate along the axial direction of the sludge tank 200.

[0049] The geared motor 620 can provide stable rotational power, which provides linear movement power for the cake 610. The extrusion assembly can provide a large thrust, which is suitable for moving heavier sludge chamber structures.

[0050] The aeration assembly includes an aeration pipe 810, an air pump 820, and several aeration nozzles 830. The air pump 820 is fixedly connected to the outside of the outer ring reaction tank 100. The main body of the aeration pipe 810 is arranged at the bottom of the inner cavity 110 of the outer ring reaction tank 100. The beginning end of the aeration pipe 810 extends out of the outer ring reaction tank 100 and is connected to the air outlet of the air pump 820. Several aeration nozzles 830 are distributed on the aeration pipe 810.

[0051] The inner cavity 110 of the outer ring reaction tank 100 also cultivates algae and other plants 700 that are conducive to the propagation of microorganisms.

[0052] An operating platform 140 for personnel use is also provided on the upper side of the outer ring reaction tank 100.

[0053] The method for treating wastewater using the above-mentioned rural domestic wastewater treatment device based on SBR technology includes the following steps:

[0054] Unpurified rural domestic sewage is fed into the inner cavity 110 of the outer ring reaction tank 100 through the inlet 120. The unpurified rural domestic sewage can pass through the inner cavity 110, sludge purification chamber 500, connecting pipe 510, and sludge bucket 200 in sequence until the inner cavity 110, sludge purification chamber 500, connecting pipe 510, and sludge bucket 200 are filled with unpurified rural domestic sewage. After standing for a certain period of time (e.g., one hour), according to the sewage parameters such as BOD5 and COD, the microbial solution required for sewage purification is transported into the sewage bucket through the microbial agent conduit 400. After a certain period of time (e.g., five hours), it is discharged from the sewage discharge pipe 300. During this process, the aeration component air pump 820 transports external air to the inner cavity 110 of the outer ring reaction tank 100 through the aeration pipe 810 and aeration nozzle 830.

[0055] One hour after each injection of the microbial solution required for wastewater purification into the wastewater tank via the microbial agent conduit 400, the concentration of the microbial solution at the beginning of the microbial agent conduit 400 is detected. If the concentration of the microbial solution is still greater than or equal to half of the concentration 10 minutes after injection, it indicates that sludge and foreign objects have accumulated in the wastewater tank and sludge purification chamber 500. The squeezing component is then activated. The drive mechanism of the squeezing component moves the pressing cake 610 to the bottom of the sludge tank 200. The pressing cake 610 not only squeezes the sludge in the sludge tank 200 and discharges it from the sewage pipe 300, but also the movement trajectory of the pressing cake 610 causes water flow disturbance in the sludge purification chamber 500, preventing sludge and foreign objects from clogging the gaps on the surface of the sludge purification chamber 500.

[0056] To achieve the aforementioned complex actions, a precise control system is required. A programmable logic controller (PLC) can be used for this control. In PLC programming, the different program logic for the water injection and reaction stages is set.

[0057] During water injection, the PLC issues a command, which uses sensors (such as position sensors) to provide feedback on whether each chamber is functioning normally. Once a signal is received, the water injection operation begins.

[0058] During the reaction phase, the PLC controls the speed and distance of the pressing cake 610 to move according to preset parameters and the reaction time and requirements, so as to achieve the best reaction effect.

[0059] Microbial wastewater treatment can automatically adjust the adaptability of microorganisms, achieving good treatment results under different conditions, and the treatment effect is stable and reliable. We have also significantly improved the reactor volume utilization rate and reduced the complexity of equipment control. Traditional SBR process equipment requires a very high degree of automation, so we have optimized its control algorithm and logic to more accurately control various parameters of the reaction tank, such as water level and dissolved oxygen.

[0060] Water level control algorithm optimization: A PID control algorithm can be adopted. A high-precision water level sensor is installed in the reaction tank to acquire water level data in real time. The PID controller calculates the control signal based on the deviation between the set water level value and the actual water level value. During the water injection phase, if the water level is lower than the set value, the opening of the inlet valve is increased; if the water level is higher than the set value, the opening of the inlet valve is decreased. The same principle applies during the drainage phase, achieving precise water level regulation by controlling the drainage valve. Simultaneously, the PID parameters are dynamically adjusted. For example, when the water level deviation is large, the proportional coefficient is appropriately increased to accelerate the adjustment speed; when approaching the set water level, the proportional coefficient is decreased, and the integral and derivative actions are increased to reduce overshoot and oscillation, thus maintaining the water level more stably at the target value.

[0061] Dissolved oxygen control logic optimization: On one hand, a combination of fuzzy control and PID control is adopted. Multiple dissolved oxygen sensors are installed in the reaction tank to collect dissolved oxygen data at different locations. The fuzzy controller establishes fuzzy rules based on relevant parameters such as influent flow rate, water quality (e.g., organic matter content), and temperature to dynamically adjust the target value of dissolved oxygen. For example, when the influent organic matter content is high and the temperature is suitable, the target dissolved oxygen value is appropriately increased. Then, the PID controller controls the aeration equipment, such as the speed of the aeration blower and the opening degree of the aeration valve, based on the deviation between the target value output by the fuzzy controller and the actual dissolved oxygen value.

[0062] On the other hand, model predictive control (MPC) is introduced. Based on a dynamic model of the reactor, the trend of dissolved oxygen changes over a future period is predicted. The aeration strategy is adjusted in advance based on the prediction results to cope with fluctuations in influent water quality and quantity, and to better maintain dissolved oxygen within a suitable range. Simultaneously, the model prediction results are corrected by combining real-time data feedback, continuously optimizing the control strategy and improving control accuracy.

[0063] The rural domestic sewage treatment device based on the SBR process was used to treat rural domestic sewage. The parameters of the raw sewage were: COD=350mg / L, TN=45mg / L, TP=6mg / L.

[0064] After five hours of operation, this rural domestic wastewater treatment device based on the SBR process achieved a COD removal rate of ≥95%, a TN removal rate of ≥85%, and a TP removal rate of ≥90%, with a 22% reduction in power consumption compared to traditional SBR systems (actual measured data). The microbial solution dosage was 0.5 L / m³ per cycle. 3 .

[0065] The above description is only one embodiment of the present utility model. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the principle of the present utility model, and these should also be considered to fall within the protection scope of the present utility model.

Claims

1. A rural domestic sewage treatment device based on SBR technology, characterized in that: It includes an outer ring reaction tank (100), a sludge bucket (200), a sewage pipe (300), a microbial agent conduit (400), an extrusion assembly, and several sludge purification chambers (500); The outer ring reaction tank (100) is provided with an inner cavity (110) for containing sewage. The outer wall of the outer ring reaction tank (100) has an inlet (120) and a pressure relief port (130) that communicate with the inner cavity (110). The sludge bucket (200) is fixed at the center of the outer ring reaction tank (100). The upper end of the sludge bucket (200) has an opening. One end of the sewage pipe (300) is connected to the bottom of the sludge bucket (200), and the other end of the sewage pipe (300) is connected to the outside of the outer ring reaction tank (100). One end of the microbial preparation conduit (400) is also connected to the bottom of the sludge bucket (200). Several sludge purification chambers (500) are located inside the inner cavity (110), and several sludge purification chambers (500) are fixed to the side of the sludge bucket (200). The surface of the sludge purification chamber (500) is provided with a gap that communicates with the inner cavity (110) of the outer ring reaction tank (100). The sludge purification chamber (500) and the sludge bucket (200) are also connected by a connecting pipe (510). The extrusion assembly includes a pressing cake (610) and a driving mechanism. The driving mechanism is fixedly connected to the upper side of the outer ring reaction tank (100). The pressing cake (610) extends into the sludge tank (200) from the upper opening. The outer contour of the pressing cake (610) fits the cross-sectional shape of the inner cavity (110) of the sludge tank (200). The driving mechanism drives the pressing cake (610) to reciprocate along the axial direction of the sludge tank (200).

2. The rural domestic sewage treatment device based on SBR process according to claim 1, characterized in that: Several sludge purification chambers (500) are distributed in three layers along the axial direction of the sludge bucket (200), and the three layers of sludge purification chambers (500) are arranged alternately.

3. The rural domestic sewage treatment device based on SBR process according to claim 2, characterized in that: Several sludge purification chambers (500) on each floor are evenly distributed in a circular pattern along the axis of the sludge bucket (200).

4. The rural domestic sewage treatment device based on SBR process according to claim 1, characterized in that: The extrusion assembly also includes a telescopic column (630), the driving mechanism is a geared motor (620), the inner wall of the sludge bucket (200) is threaded, the pressing cake (610) is threadedly engaged with the inner wall of the sludge bucket (200), and the geared motor (620) and the pressing cake (610) are connected and fixed through the telescopic column (630).

5. The rural domestic sewage treatment device based on SBR process according to claim 1, characterized in that: It also includes an aeration assembly, which includes an aeration pipe (810), an air pump (820), and several aeration nozzles (830). The air pump (820) is fixedly connected to the outside of the outer ring reaction tank (100). The main body of the aeration pipe (810) is arranged at the bottom of the inner cavity (110) of the outer ring reaction tank (100). The beginning of the aeration pipe (810) is connected to the air outlet of the air pump (820). Several aeration nozzles (830) are distributed on the aeration pipe (810).

6. The rural domestic sewage treatment device based on SBR process according to claim 1, characterized in that: Algae and plants (700) that promote the proliferation of microorganisms are also cultivated in the inner cavity (110) of the outer ring reaction tank (100).

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