An automatic sludge discharge system for rural domestic sewage treatment and its control method

Abstract

The present invention proposes an automatic sludge discharge system and a control method thereof for rural domestic sewage treatment, belonging to the technical field of sewage treatment. The automatic sludge discharge system includes a sedimentation subsystem, a sludge discharge subsystem, and a control subsystem. The control subsystem includes an SS monitor, a first rotation control subsystem, and a second self-priming pump control subsystem. Based on the SS content value monitored by the SS monitor, the control subsystem starts the first rotation control subsystem to control the rotation state of the sludge suction pipe assembly structure; and / or, based on the SS content value monitored by the SS monitor, the control subsystem starts the second self-priming pump control subsystem to control the start and stop state of the self-priming pump. The present invention also discloses a control method for the automatic sludge discharge system. The technical solution of the present invention can better adapt to the characteristics of large changes in water quality and water volume of rural domestic sewage inlet and concentrated water production time, and can ensure that the tail water meets the standards and the discharge facilities operate normally.

Description

Technical Field

[0001] The present invention belongs to the technical field of sewage treatment, and in particular relates to an automatic mud discharge system for rural domestic sewage treatment and a control method thereof. Background Art

[0002] The current trend of vigorously promoting the development of beautiful agricultural and rural villages has fundamentally transformed the rural living environment. While centralized collection and sorting of domestic waste have been largely completed, the degree of centralized treatment and efficiency of rural domestic sewage remain low. Rural sewage collection is difficult due to factors such as a lack of scientific planning, irrational layout, inadequate or nonexistent drainage networks, complex terrain, dispersed populations, narrow roads, and inadequate infrastructure. Furthermore, and most importantly, rural domestic sewage quality is highly unstable. Water flow fluctuates day and night, and can even cease, resulting in intermittent sewage discharge and a water consumption coefficient far greater than that found in cities.

[0003] Current rural domestic sewage treatment facilities are generally divided into pretreatment systems, biochemical treatment systems, sedimentation and sludge removal systems, and advanced treatment systems. The operating efficiency of each system is affected by changes in influent volume and quality. Sedimentation and sludge removal systems, in particular, must promptly discharge excess sludge generated during the biochemical process to ensure that tailwater meets discharge standards.

[0004] However, practice has found that the current sludge discharge systems used in rural domestic sewage treatment systems have a low degree of automation and are unable to adapt to the characteristics of rural domestic sewage inlet water quality, large changes in water volume, and concentrated water production time, and are not sufficiently adaptable to the actual rural sewage production environment. Summary of the Invention

[0005] In order to solve the above technical problems, the present invention proposes an automatic sludge discharge system for rural domestic sewage treatment and a control method thereof.

[0006] In a first aspect of the present invention, an automatic mud discharge system for rural domestic sewage treatment is provided, wherein the automatic mud discharge system is connected to a rural domestic sewage treatment system.

[0007] Specifically, the automatic mud discharge system includes a sedimentation subsystem, a mud discharge subsystem and a control subsystem;

[0008] The sedimentation subsystem includes a sludge sedimentation tank, and a sludge suction pipe combination structure is configured in the sludge sedimentation tank;

[0009] The sludge discharge subsystem includes a self-priming pump connected to the sludge suction pipe assembly structure in the sludge sedimentation tank;

[0010] The control subsystem includes an SS monitor, a first rotation control subsystem, and a second self-priming pump control subsystem;

[0011] The control subsystem is a PLC control cabinet, which includes a first rotary control cabinet and a second self-priming pump control cabinet.

[0012] The SS monitor is installed in the sludge sedimentation tank;

[0013] The control subsystem starts the first rotation control subsystem to control the rotation state of the sludge suction pipe assembly structure based on the SS content value monitored by the SS monitor;

[0014] And / or, the control subsystem starts the second self-priming pump control subsystem to control the start and stop status of the self-priming pump based on the SS content value monitored by the SS monitor.

[0015] The rural domestic sewage treatment system includes a sewage pretreatment system, a sewage biochemical treatment system and a sludge drying tank;

[0016] Rural domestic sewage enters the sewage biochemical treatment system after being pretreated by the sewage pretreatment system;

[0017] The sewage is treated by the biochemical treatment system and then enters the sedimentation subsystem of the automatic sludge discharge system;

[0018] The sludge in the sewage is sucked into the sludge drying tank through the self-priming pump of the sludge discharge subsystem.

[0019] The sludge suction pipe assembly structure configured in the sludge sedimentation tank includes a sludge suction main pipe and multiple sludge suction branch pipes, and multiple sections of filter screens are evenly distributed on the sludge suction main pipe;

[0020] The plurality of mud suction branch pipes are symmetrically combined with the mud suction main pipe and are connected to the mud suction main pipe;

[0021] The self-priming pump is connected to the mud suction main pipe of the mud suction pipe combination structure through a first water inlet pipe.

[0022] In a second aspect of the present invention, a control method is provided for automatic sludge discharge control of an automatic sludge discharge system for rural domestic sewage treatment.

[0023] The control method comprises the following steps:

[0024] S600: Acquire the SS content value monitored by the SS monitor according to the first cycle;

[0025] S610: If the SS content value is less than the first preset value, proceed to step S620;

[0026] If the SS content value is greater than the first preset value and less than the second preset value, proceed to step S630;

[0027] If the SS content value is greater than the second preset value, proceed to step S640;

[0028] S620: If the self-priming pump is in the on state or the sludge suction pipe assembly structure is in the rotating state, shut down the second self-priming pump control subsystem to shut down the self-priming pump, or shut down the first rotation control subsystem to stop the rotation of the sludge suction pipe assembly structure, and return to step S600;

[0029] S630: Start the first rotation control subsystem to control the mud suction pipe assembly structure to rotate, and return to step S600;

[0030] S640: Turn off the first rotation control subsystem to stop the rotation of the mud suction pipe assembly structure;

[0031] Start the second self-priming pump control subsystem, turn on the self-priming pump, and return to step S600.

[0032] In step S620, if the self-priming pump is in the off state and the mud suction pipe assembly structure is in the non-rotating state, the first cycle is increased and the process returns to step S600.

[0033] In the step S640 , the second self-priming pump control subsystem is started. After the self-priming pump is turned on, the first cycle is reduced and the process returns to the step S600 .

[0034] In the step S600, if the current SS content value obtained is greater than the previous SS content value obtained last time, the first period is increased; otherwise, the first period is decreased.

[0035] The method further comprises:

[0036] Before step S600 , the initial value of the first cycle at different time periods, the first preset value, and the second preset value are set in the control subsystem.

[0037] Based on the technical solution of this invention, the automatic sludge discharge system can timely discharge sludge based on the real-time sludge production in the biochemical system and sludge in the sedimentation tank of the sewage treatment facility, ensuring that tailwater meets standards and the discharge facilities operate normally. The automatic sludge discharge system's self-priming pump start-stop status, start-stop cycle / sludge suction pipe combination structure, and other functions are adaptively monitored by the current real-time influent water quality, water volume changes, and trends, enabling better adaptation to the actual rural sewage generation environment.

[0038] Further advantages of the present invention will be further reflected in detail in the specific embodiments section in conjunction with the drawings of the specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0040] Figure 1 This is a schematic diagram of the overall connection between the automatic mud discharge system and the rural domestic sewage treatment system according to one embodiment of the present invention;

[0041] Figure 2 This is a schematic diagram of the specific structure and connection of an automatic mud discharge system for rural domestic sewage treatment according to an embodiment of the present invention;

[0042] Figure 3 This is a schematic diagram of the internal substructure control of an automatic mud discharge system according to an embodiment of the present invention;

[0043] Figure 4 1. It is a schematic diagram of the combined structure of the internal mud suction pipe included in the automatic mud discharge system according to one embodiment of the present invention;

[0044] Figure 5 This is a structural diagram of an external self-priming pump portion connected to a mud suction main pipe of an automatic mud discharge system according to an embodiment of the present invention;

[0045] Figure 6 This is a flow chart of a control method for an automatic sludge discharge system for rural domestic sewage treatment according to an embodiment of the present invention;

[0046] Figure 7 It is a flow chart of a more preferred embodiment of a control method for an automatic sludge discharge system for rural domestic sewage treatment according to an embodiment of the present invention. DETAILED DESCRIPTION

[0047] The invention is further described below with reference to the accompanying drawings and specific implementation methods.

[0048] Before introducing the technical solution of the present invention, the prior art related to the present application is first introduced in order to better understand the improvement motivation of the present application, thereby distinguishing the prior art part in the technical solution from the creative improvement part of the present invention, and reflecting the close integration of the improvement part of the present application with the actual production environment.

[0049] Wastewater treatment, also known as sewage treatment, mainly uses physical (filtration, sedimentation), chemical (chemical reaction) and biological (biological consumption) methods to eliminate pollutants in water.

[0050] Rural domestic wastewater treatment primarily involves urine, feces, and rural shed flushing water. This type of wastewater is characterized by high concentrations of organic matter, suspended solids, high levels of ammonia nitrogen and total phosphorus, and a strong odor. Rural feces contain large amounts of nitrogen, phosphorus, suspended solids, pathogenic bacteria, heavy metals, and veterinary drug residues. If these pollutants are not properly treated and enter natural water bodies and farmland, they can cause serious environmental pollution and serve as a vector for numerous diseases.

[0051] Rural domestic wastewater first enters a screen well, where a mechanical screen intercepts and removes floating debris larger than 2mm in diameter to prevent clogging of subsequent pumps and pipes. It then enters a mixing and regulating tank, where water quality and quantity are regulated and feces and wastewater are thoroughly mixed. It is then pumped into a biogas fermentation reactor via a lift pump, where large organic molecules are broken down into small molecules. Most of this organic matter is then converted into methane and carbon dioxide and removed (biogas undergoes desulfurization, dehydration, and fire retardation for use in rural areas and can also be used for biogas power generation). Finally, it enters a sedimentation state for mud and water separation.

[0052] Therefore, in terms of overall structure, the treatment process of rural domestic sewage basically includes pretreatment (such as the aforementioned "removal of floating objects with a particle diameter greater than 2 mm through mechanical screens to prevent clogging of subsequent pumps and pipes"), biochemical treatment (aeration and oxygenation, etc.), sedimentation and sludge discharge (such as the aforementioned "entering the sedimentation state and performing mud-water separation"), and deep treatment (which may include other treatment processes, such as further desulfurization, dehydration, and fire retardation for rural use, biogas power generation, and other processes).

[0053] Rural domestic sewage sludge contains a large amount of organic matter, nitrogen, phosphorus, and potassium nutrients, which are beneficial for subsequent resource utilization, especially phosphorus resources. Sludge products can meet 20%-30% of agricultural phosphorus demand. In the above process, sedimentation and sludge discharge require the timely discharge of excess sludge generated during the biochemical process to ensure that the tailwater meets discharge standards.

[0054] Existing sludge removal systems are typically equipped with self-priming pumps. To remove sludge promptly, these pumps often need to run for extended periods, sometimes around the clock. This control method is essential when sewage inflow is high and continuous.

[0055] However, unlike other wastewater sources, rural domestic sewage exhibits significant variability in influent quality and volume, with concentrated water production. Specifically, it experiences high volumes in the morning, afternoon, and evening, with minimal production at other times. Continuing to use existing sludge discharge systems and traditional control methods would increase energy consumption and reduce treatment efficiency, making them unsuitable for the specific characteristics of rural domestic sewage production.

[0056] After the above observations and long-term on-site statistical practice, the inventor proposed the improved technical solution of the present application. The technical solution of the present invention can better adapt to the characteristics of large changes in water quality / water volume of rural domestic sewage inflow and concentrated water production time, and can ensure that the tail water meets the standards and the discharge facilities operate normally.

[0057] First refer to Figure 1 This application first proposes an automatic mud discharge system, which can be applied to the existing rural domestic sewage treatment process. Specifically, in terms of overall structure, the automatic mud discharge system is connected to the existing rural domestic sewage treatment system.

[0058] It can be understood that the automatic mud discharge system of the present application can be connected to various existing rural domestic sewage treatment systems.

[0059] As mentioned above, the treatment process of rural domestic sewage basically includes pretreatment, biochemical treatment, sedimentation and sludge discharge, and deep treatment.

[0060] When the automatic sludge discharge system of the present application is connected to the above-mentioned rural domestic sewage treatment system, it is used to perform the sedimentation and sludge discharge processes therein, and other processes still use the existing structure.

[0061] Figure 2 The specific structural connection diagram of the automatic sludge discharge system for rural domestic sewage treatment is further shown.

[0062] Combine Figure 2 , the rural domestic sewage treatment system includes a sewage pretreatment system, a sewage biochemical treatment system and a sludge drying tank;

[0063] Rural domestic sewage enters the sewage biochemical treatment system after being pretreated by the sewage pretreatment system;

[0064] The sewage is treated by the biochemical treatment system and then enters the sedimentation subsystem of the automatic sludge discharge system;

[0065] The sludge in the sewage is sucked into the sludge drying tank through the self-priming pump of the sludge discharge subsystem.

[0066] exist Figure 2 In the automatic mud discharge system, the automatic mud discharge system includes a sedimentation subsystem, a mud discharge subsystem and a control subsystem;

[0067] The sedimentation subsystem includes a sludge sedimentation tank. The sludge discharge subsystem includes a self-priming pump.

[0068] It can be understood that the sludge sedimentation tank and self-priming pump can adopt various sedimentation devices and self-priming pump devices used in sewage treatment cities known in the prior art. Their structures are known. Since they are not the focus of improvement of this application, they are not specifically elaborated in this embodiment.

[0069] As one of the specific improvements of the present application, a sludge suction pipe assembly structure is provided in the sludge sedimentation tank, and the self-priming pump is connected to the sludge suction pipe assembly structure in the sludge sedimentation tank.

[0070] In order to better reflect the above improvements, Figure 2 Based on Figure 3 . Figure 3 It is a schematic diagram of the internal substructure control of the automatic mud discharge system of an embodiment of the present invention.

[0071] Wherein, the control subsystem includes an SS monitor, a first rotation control subsystem and a second self-priming pump control subsystem;

[0072] The SS monitor is installed in the sludge sedimentation tank.

[0073] Specifically, the control subsystem is a PLC control cabinet, and the PLC control cabinet includes a first rotary PLC control cabinet and a second self-priming pump PLC control cabinet.

[0074] SS monitor is short for suspended solids (SS) monitor. Suspended solids (SS) in water refers to the solid matter retained on a 0.45μm filter membrane after a water sample passes through it and is then dried at 103-105°C to a constant weight.

[0075] The basic process of SS content detection by SS monitor can also be referred to the existing technology.

[0076] Figure 4 The figure is a schematic diagram of the internal mud suction pipe assembly structure included in the automatic mud discharge system of one embodiment of the present invention.

[0077] The sludge suction pipe assembly structure configured in the sludge sedimentation tank includes a sludge suction main pipe and a plurality of sludge suction branch pipes;

[0078] The plurality of mud suction branch pipes are symmetrically combined with the mud suction main pipe and are connected to the mud suction main pipe;

[0079] The self-priming pump is connected to the mud suction main pipe of the mud suction pipe combination structure through a first water inlet pipe.

[0080] Multiple sections of filter screens are evenly distributed on the mud suction main pipe.

[0081] exist Figure 4 The suction pipe assembly structure includes a rotation axis, which is a vertical line running vertically along the main suction pipe. The suction pipe assembly can rotate 360° clockwise or counterclockwise along this vertical rotation axis. During rotation, the sludge-laden wastewater inside the main and branch pipes is accelerated and discharged along the main pipe due to the interaction of centrifugal and centripetal forces.

[0082] Of course, it is worth pointing out that in actual operation, the rotation speed of the sludge suction pipe assembly structure when in a rotating state is relatively low, for example, one rotation per minute (360° / min) or two rotations per minute (720° / min), and generally not more than 5 rotations per minute, so as to avoid excessive rotation and reducing the subsequent sedimentation rate of the sludge.

[0083] At the same time, since the mud suction pipe combination structure may be in a rotating state, therefore, in the above embodiment, "the self-priming pump is connected to the mud suction main pipe of the mud suction pipe combination structure through the first water inlet pipe", the self-priming pump is not physically contacted (or fixed) connected, but is close to the bottom mud discharge outlet corresponding to the mud suction main pipe ( Figure 3 Schematic diagram described above).

[0084] exist Figures 1-4 Based on Figure 5 . Figure 5 The present invention is a schematic structural diagram of an external self-priming pump connected to a mud suction main pipe of an automatic mud discharge system according to an embodiment of the present invention.

[0085] After biochemical treatment, rural domestic sewage enters the automatic sludge discharge system for treatment.

[0086] At this time, the control subsystem starts the first rotation control subsystem to control the rotation state of the sludge suction pipe assembly structure based on the SS content value monitored by the SS monitor;

[0087] And / or, the control subsystem starts the second self-priming pump control subsystem to control the start and stop status of the self-priming pump based on the SS content value monitored by the SS monitor.

[0088] During this process, the main pipe of the sludge settling tank is connected to a self-priming pump. The first rotary PLC control cabinet controls the rotation of the sludge suction pipe assembly structure; the second self-priming pump PLC control cabinet controls the start and stop status of the self-priming pump, thereby sucking out the sludge and finally entering the sludge drying tank.

[0089] The sludge suction main pipe is connected to the water inlet of the self-priming pump through the water inlet flange, and the self-priming pump is connected to the sludge drying tank through the water outlet flange.

[0090] The above is an introduction to the basic structure and basic working principle of the automatic mud discharge system for rural domestic sewage treatment in one embodiment of the present application. Figure 6-Figure 7 , further introduces the automation control method of the automatic sludge discharge system for rural domestic sewage treatment.

[0091] See also Figure 6 , the automatic control method comprises the following steps:

[0092] S600: Acquire the SS content value SSvalue monitored by the SS monitor according to the first cycle;

[0093] S610: If the SS content value SSvalue is less than the first preset value FirSet, proceed to step S620;

[0094] If the SS content value SSvalue is greater than the first preset value FirSet and less than the second preset value SecSet, proceed to step S630;

[0095] If the SS content value SSvalue is greater than the second preset value SecSet, proceed to step S640;

[0096] S620: If the self-priming pump is in the on state or the sludge suction pipe assembly structure is in the rotating state, shut down the second self-priming pump control subsystem to shut down the self-priming pump, or shut down the first rotation control subsystem to stop the rotation of the sludge suction pipe assembly structure, and return to step S600;

[0097] S630: Start the first rotation control subsystem to control the mud suction pipe assembly structure to rotate, and return to step S600;

[0098] S640: Turn off the first rotation control subsystem to stop the rotation of the mud suction pipe assembly structure;

[0099] Start the second self-priming pump control subsystem, turn on the self-priming pump, and return to step S600.

[0100] During actual execution, before step S600 , the initial value of the first cycle at different time periods, the first preset value, and the second preset value are set in the control subsystem.

[0101] As a specific example, the different time periods include morning / noon / evening / other time periods.

[0102] Specifically, the initial values of the first cycle in different time periods can be set according to the following table:

[0103]

[0104] As a specific example, if the current time period is in the morning time period, the SS content value SSvalue monitored by the SS monitor is obtained every 15 minutes;

[0105] If the SS content value SSvalue is less than the first preset value FirSet (10 mg / L) corresponding to the current time period, if the self-priming pump is in the on state or the sludge suction pipe assembly structure is in the rotating state, the second self-priming pump control subsystem is turned off to turn off the self-priming pump, or the first rotation control subsystem is turned off to stop the rotation of the sludge suction pipe assembly structure, and the process returns to step S600;

[0106] If the SS content value SSvalue is greater than the first preset value FirSet (10 mg / L) corresponding to the current time period and less than the second preset value SecSet (50 mg / L) corresponding to the current time period, the first rotation control subsystem is activated to control the sludge suction pipe assembly structure to rotate, and the process returns to step S600;

[0107] If the SS content value SSvalue is greater than the second preset value SecSet (50 mg / L) corresponding to the current time period, the first rotation control subsystem is turned off to stop the rotation state of the sludge suction pipe assembly structure;

[0108] Start the second self-priming pump control subsystem, turn on the self-priming pump, and return to step S600.

[0109] It can be seen that in the embodiments of the present application, the first period / first preset value / second preset value corresponding to different time periods may be different. The above table is merely indicative. During actual operation, the initial value of the first period at different time periods, the first preset value, and the second preset value can be pre-set in the control subsystem based on historical experience values. After setting, the system can operate automatically. After a period of automatic operation, the initial value of the first period at different time periods, the first preset value, and the second preset value can be further adjusted based on the updated historical experience values, thereby achieving adaptive feedback closed-loop learning and control.

[0110] As a more preferred example, see Figure 7 .

[0111] In step S620, if the self-priming pump is in the off state and the mud suction pipe assembly structure is in the non-rotating state, the first cycle is increased and the process returns to step S600.

[0112] In the step S640 , the second self-priming pump control subsystem is started. After the self-priming pump is turned on, the first cycle is reduced and the process returns to the step S600 .

[0113] In the step S600, if the current SS content value obtained is greater than the previous SS content value obtained last time, the first period is increased; otherwise, the first period is decreased.

[0114] As can be seen, in a preferred embodiment, the length of the first cycle can be adaptively changed even within the same time period. For example, even if the first cycle of the morning period is preset to 15 minutes, the length of the next first cycle can be adaptively adjusted after each first cycle in the morning period of 6:00-9:00, thereby responding to actual conditions more promptly and avoiding a mechanical static control method.

[0115] In the above embodiments of the present invention, other structures or control methods not specifically described in the specification, such as the sludge drying tank, controlling the rotation of the sludge suction pipe combination structure, turning on / off the self-priming pump, etc., all refer to the existing technology.

[0116] Compared with the manual opening and full-time opening methods of the sludge discharge device in the prior art, the start and stop status of the self-priming pump of the automatic sludge discharge system proposed in the technical solution of the present invention, the rotation status of the start and stop cycle / sludge suction pipe combination structure, etc., are all adaptive to the current real-time influent water quality, water volume change value and change trend of rural domestic sewage, can better adapt to the actual rural sewage production environment, and significantly reduce energy consumption.

[0117] In terms of effectiveness, the automatic sludge discharge system realizes timely sludge discharge based on the real-time situation of sludge production in the biochemical system and sludge in the sedimentation tank in the sewage treatment facility, so as to ensure that the tail water meets the standards and the discharge facilities operate normally.

[0118] The applicant has successfully implemented this technical solution in many rural areas. Its economy, efficiency and various indicators have reached or exceeded relevant industry standards and have been widely reported and promoted.

[0119] In the various embodiments of the present invention, the embodiments of the present invention have been shown and described, but it is understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A control method for an automatic mud discharge system for rural domestic sewage treatment, wherein the automatic mud discharge system comprises a sedimentation subsystem, a mud discharge subsystem, and a control subsystem; The sedimentation subsystem includes a sludge sedimentation tank, and a sludge suction pipe combination structure is configured in the sludge sedimentation tank; The sludge discharge subsystem includes a self-priming pump connected to the sludge suction pipe assembly structure in the sludge sedimentation tank; The control subsystem includes an SS monitor, a first rotation control subsystem, and a second self-priming pump control subsystem; The SS monitor is installed in the sludge sedimentation tank; It is characterized by: The control method comprises the following steps: S600: Acquire the SS content value monitored by the SS monitor according to the first cycle; S610: If the SS content value is less than the first preset value, proceed to step S620; If the SS content value is greater than the first preset value and less than the second preset value, proceed to step S630; If the SS content value is greater than the second preset value, proceed to step S640; S620: If the self-priming pump is in the on state or the sludge suction pipe assembly structure is in the rotating state, shut down the second self-priming pump control subsystem to shut down the self-priming pump, or shut down the first rotation control subsystem to stop the rotation of the sludge suction pipe assembly structure, and return to step S600; S630: Start the first rotation control subsystem to control the mud suction pipe assembly structure to rotate, and return to step S600; S640: Turn off the first rotation control subsystem to stop the rotation state of the mud suction pipe assembly structure; Start the second self-priming pump control subsystem, turn on the self-priming pump, and return to step S600.

2. The control method of the automatic mud discharge system for rural domestic sewage treatment according to claim 1, characterized in that: In step S620, if the self-priming pump is in the off state and the mud suction pipe assembly structure is in the non-rotating state, the first cycle is increased and the process returns to step S600.

3. The control method of the automatic mud discharge system for rural domestic sewage treatment according to claim 1, characterized in that: In the step S640 , the second self-priming pump control subsystem is started. After the self-priming pump is turned on, the first cycle is reduced and the process returns to the step S600 .

4. The control method of the automatic mud discharge system for rural domestic sewage treatment according to claim 1, characterized in that: In the step S600, if the current SS content value obtained is greater than the previous SS content value obtained last time, the first period is increased; otherwise, the first period is decreased.

5. The control method of the automatic mud discharge system for rural domestic sewage treatment according to claim 1, characterized in that: The method further includes: before step S600, setting the initial value of the first cycle in different time periods, the first preset value, and the second preset value in the control subsystem.

6. The control method of the automatic mud discharge system for rural domestic sewage treatment according to claim 1, characterized in that: The sludge suction pipe assembly structure configured in the sludge sedimentation tank includes a sludge suction main pipe and a plurality of sludge suction branch pipes; The plurality of mud suction branch pipes are symmetrically combined with the mud suction main pipe and are connected to the mud suction main pipe; The self-priming pump is connected to the mud suction main pipe of the mud suction pipe combination structure through a first water inlet pipe.

7. A control method for an automatic mud discharge system for rural domestic sewage treatment according to claim 6, characterized in that: Multiple sections of filter screens are evenly distributed on the mud suction main pipe.

8. The control method of the automatic mud discharge system for rural domestic sewage treatment according to claim 1, characterized in that: The control subsystem is a PLC control cabinet, which includes a first rotary control cabinet and a second self-priming pump control cabinet.

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