A control method for a sewage treatment system

Abstract

The present application relates to the technical field of sewage treatment, and in particular to a control method for a sewage treatment system, wherein the sewage treatment system includes a controller and a first reaction system, the first reaction system includes a regulating tank, a first reaction tank and a first water inlet component, a liquid level gauge is provided in the regulating tank, a first aeration component is provided in the first reaction tank, the first water inlet component is connected to the regulating tank and the first reaction tank, the controller stores a first sewage treatment program and controls a first intermittent aeration program, and the control method includes: monitoring the real-time liquid level of the regulating tank; comparing the real-time liquid level with a preset liquid level to obtain a comparison result; the preset liquid level includes a low liquid level, a high liquid level, and a protection liquid level; according to the comparison result, the controller controls the first reaction system to execute the first sewage treatment program, or controls the first aeration component to execute the first intermittent aeration program; wherein, within any cycle of the first reaction system, the first aeration component performs intermittent aeration.

Description

Technical Field

[0001] The present application relates to the technical field of sewage treatment, and in particular to a control method for a sewage treatment system. Background Art

[0002] In rural my country, domestic sewage quality varies significantly across regions, influenced by factors such as living habits, climate, economic development, and drainage systems. Rural populations are dispersed, resulting in low population density and a relatively small amount of centrally located sewage. This results in significant fluctuations in both quality and quantity of rural sewage, discontinuous discharge, and increased challenges in rural sewage treatment.

[0003] The Sequencing Batch Reactor Activated Sludge Process (SBR) is a variation of the traditional activated sludge process. Wastewater enters the reactor intermittently and periodically, undergoing different treatment steps in a chronological order within each cycle. The SBR process consists of five stages within each cycle: inlet, reaction, sedimentation, drainage, and idle. SBR units typically used for rural sewage treatment use a programmable logic controller (PLC) or single-chip microcomputer for automated execution, employing a single execution mode throughout. The inlet, reaction, sedimentation, drainage, and idle stages are all executed in a repetitive cycle with set timelines. When the SBR system receives a uniform flow of water, the difference between the liquid level in the SBR's regulating tank and the design level is small, the inlet flow rate meets the design requirements, and the SBR system can operate normally. However, when the water inflow of the SBR device is uneven, the difference between the liquid level of the regulating tank of the SBR device and the designed liquid level is large, and the water inflow and execution of the SBR device will be affected.

[0004] To address the uneven water flow, related technologies use a method of setting high and low liquid levels in the regulating tank, controlling the switch of the SBR unit's water inlet pump based on the liquid level. The specific adjustment method is: when the liquid level in the regulating tank is higher than the low level and lower than the high level, the water inlet pump is turned on to start water flowing from the regulating tank into the reaction tank. When the liquid level in the regulating tank is lower than the low level, the water inlet pump is turned off, water flow stops, and the reaction tank is left in a static state. This results in lower activity and a slower reaction speed when the reaction tank, which has been static for a long time, is filled with water again for reaction, affecting the reaction efficiency of the reaction tank. Summary of the Invention

[0005] In order to improve the reaction efficiency of a reaction tank when the incoming water volume is uneven, the present application provides a control method for a sewage treatment system.

[0006] The present application provides a control method for a sewage treatment system using the following technical solutions:

[0007] A control method for a sewage treatment system, the sewage treatment system comprising a controller and a first reaction system, the first reaction system comprising a regulating tank, a first reaction tank, and a first water inlet assembly, the regulating tank being provided with a liquid level gauge, the first reaction tank being provided with a first aeration assembly, the first reaction tank being located downstream of the regulating tank, the first water inlet assembly being connected to the regulating tank and the first reaction tank, the controller storing a first sewage treatment program for controlling the first reaction system to perform sewage treatment, and a first intermittent aeration program for controlling the first aeration assembly to perform intermittent aeration, the control method comprising:

[0008] Monitor the real-time liquid level in the regulating tank by a liquid level gauge;

[0009] Comparing the real-time liquid level with the preset liquid level to obtain a comparison result; the preset liquid level includes a low liquid level, a high liquid level, and a protection liquid level, the protection liquid level being the liquid level change of the regulating tank corresponding to a single water inflow into the first reaction tank, and the high liquid level being greater than the sum of the low liquid level and the protection liquid level;

[0010] According to the comparison result, the controller controls the first reaction system to execute the first sewage treatment program, or controls the first aeration component to execute the first intermittent aeration program; wherein, within any cycle of the first reaction system, the first aeration component performs intermittent aeration.

[0011] By adopting the above technical solution, the liquid level of the regulating tank is monitored in real time using a liquid level gauge in the regulating tank, and the monitored real-time liquid level is compared with a preset liquid level. Based on the comparison result, the first aeration component is controlled to perform intermittent aeration, so that the first aeration component performs intermittent aeration in any cycle of the first reaction system. In this way, when the water inflow of the sewage treatment system is insufficient and the first water inlet component is not taking in water, the first aeration component in the first reaction tank performs intermittent aeration on the first reaction tank, thereby ensuring the activity of the first reaction tank in a "static" state, thereby improving the reaction efficiency of the first reaction tank and even the entire first reaction system.

[0012] Optionally, the step of controlling the first reaction system to execute the first sewage treatment procedure or controlling the first aeration component to execute the first intermittent aeration procedure according to the comparison result includes: within one cycle of the first sewage treatment procedure,

[0013] When the real-time liquid level is greater than or equal to the high liquid level, the controller issues a high liquid level alarm;

[0014] When the real-time liquid level is less than the high liquid level and greater than or equal to the sum of the low liquid level and the protection liquid level, the controller controls the first reaction system to execute the first sewage treatment procedure;

[0015] When the real-time liquid level is less than the sum of the low liquid level and the protection liquid level, and is greater than or equal to the low liquid level, the controller controls the first aeration component to execute the first intermittent aeration program according to the liquid level change of the regulating tank in the previous intermittent aeration cycle;

[0016] When the real-time liquid level is lower than the low liquid level, the controller controls the first aeration component to execute the first intermittent aeration program and issues a low liquid level alarm;

[0017] Wherein, one cycle corresponds to one or more intermittent aeration cycles.

[0018] By adopting the above technical solution and setting four liquid levels, the operation of the first reaction system can be controlled more accurately.

[0019] Optionally, the step of controlling the first aeration component to execute the first intermittent aeration program according to the change in the liquid level of the regulating tank during the previous intermittent aeration cycle includes:

[0020] During the first intermittent aeration cycle, the controller controls the first aeration component to perform intermittent aeration;

[0021] When the next intermittent aeration cycle begins, the real-time liquid level is less than the high liquid level and greater than or equal to the sum of the low liquid level and the protection liquid level. In the next intermittent aeration cycle, the controller controls the first aeration component to stop executing the first intermittent aeration program.

[0022] When the next intermittent aeration cycle begins, the real-time liquid level is less than the sum of the low liquid level and the protection liquid level and is greater than or equal to the low liquid level. In the next intermittent aeration cycle, the controller controls the first aeration assembly to perform intermittent aeration.

[0023] By adopting the above technical solution, by setting multiple intermittent aeration cycles within a cycle and setting corresponding intermittent aeration conditions, the reaction activity of the first reaction system is guaranteed, the energy consumption and the operating loss of the first aeration component are reduced, and the service life of the first aeration component is increased.

[0024] Optionally, the step of controlling the first aeration component to execute the first intermittent aeration program according to the change in the liquid level of the regulating tank during the previous intermittent aeration cycle includes:

[0025] During the first intermittent aeration cycle, the controller controls the first aeration component to perform intermittent aeration;

[0026] When the increase in the real-time liquid level in the previous intermittent aeration cycle is less than the protection liquid level, the controller controls the first aeration component to perform intermittent aeration in the next intermittent aeration cycle;

[0027] When the increase in the real-time liquid level in the previous intermittent aeration cycle is greater than or equal to the protection liquid level, the controller controls the first aeration component to stop executing the first intermittent aeration program in the next intermittent aeration cycle.

[0028] By adopting the above technical solution, by setting multiple intermittent aeration cycles within a cycle and setting corresponding intermittent aeration conditions, the reaction activity of the first reaction system is guaranteed, the energy consumption and the operating loss of the first aeration component are reduced, and the service life of the first aeration component is increased.

[0029] Optionally, one intermittent aeration cycle includes an aeration phase and a non-aeration phase, and the ratio of the duration of the aeration phase to the duration of the non-aeration phase is in the range of 1:5-1:2.

[0030] By adopting the above technical solution, reasonable aeration time and non-aeration time can be set within an intermittent aeration cycle, which is more conducive to the effectiveness of intermittent aeration.

[0031] Optionally, when the first water inlet component fails, the controller issues a fault alarm and controls the first aeration component to execute a first intermittent aeration program until the first water inlet component returns to normal.

[0032] By adopting the above technical solution, when the first water inlet component fails, on the one hand, an alarm can be provided so that the staff can repair it immediately, and on the other hand, the first aeration component intermittently aerates the first reaction tank to ensure the activity of the first reaction tank.

[0033] Optionally, the sewage treatment system further includes a second reaction system, wherein the cycle period of the second reaction system is the same as the cycle period of the first reaction system, the cycle period of the second reaction system is staggered with the cycle period of the first reaction system, and the staggered time is greater than or equal to the water inlet time of the first reaction tank; the second reaction system includes the regulating tank, the second reaction tank and the second water inlet component, the second reaction tank is provided with a second aeration component, the second reaction tank is located downstream of the regulating tank, the second water inlet component is connected to the regulating tank and the second reaction tank, and the controller further stores a second sewage treatment program for controlling the second reaction system to perform sewage treatment, and a second intermittent aeration program for controlling the second aeration component to perform intermittent aeration;

[0034] The control method of the second reaction system is the same as the control method of the first reaction system.

[0035] By adopting the above technical solution, two reaction systems are set up for sewage treatment, and when the water inflow is insufficient, the two reaction systems perform sewage treatment and intermittent aeration in rotation, thereby improving the reaction activity of the entire sewage treatment system and the working balance of the first reaction system and the second reaction system.

[0036] Optionally, when the first reaction system executes the first intermittent aeration program within a plurality of consecutive cycle periods, and the second reaction system executes the second sewage treatment program within one or a plurality of consecutive cycle periods, in the next cycle period, when the conditions for sewage treatment are met, the first reaction system executes the first sewage treatment program, and the second reaction system executes the second intermittent aeration program.

[0037] By adopting the above technical solution, forced rotation is achieved, so that the first reaction system and the second reaction system circulate to treat sewage, avoiding the imbalance phenomenon that one of the first reaction system and the second reaction system performs sewage treatment for a long time while the other performs intermittent aeration for a long time.

[0038] Optionally, when the first reaction system executes the first intermittent aeration program and the second reaction system executes the second intermittent aeration program, in the next cycle, when the conditions for sewage treatment are met, the reaction system with more intermittent aeration times between the first reaction system and the second reaction system executes the sewage treatment program, and the other reaction system executes the sewage treatment program or continues to execute the intermittent aeration program.

[0039] By adopting the above technical solution, the reaction system with more intermittent aeration times is forced to perform sewage treatment, and the work of the first reaction system and the second reaction system is also balanced.

[0040] Optionally, the sewage treatment system further includes a third reaction system, wherein the cycle period of the third reaction system is the same as the cycle period of the second reaction system, the cycle period of the third reaction system is staggered with the cycle period of the second reaction system, and the cycle period of the third reaction system is staggered with the cycle period of the first reaction system, and the staggered time is greater than or equal to the water inflow time of the second reaction tank; the third reaction system includes the regulating tank, the third reaction tank and the third water inflow component, the third reaction tank is provided with a third aeration component, the third reaction tank is located downstream of the regulating tank, the third water inflow component connects the regulating tank and the third reaction tank, and the control method of the second reaction system is the same as the control method of the first reaction system;

[0041] When the first reaction system, the second reaction system, and the third reaction system all perform the intermittent aeration program, in the next cycle, when the real-time liquid level of the regulating tank meets the sewage treatment conditions, the reaction system with more intermittent aeration times among the first reaction system, the second reaction system, and the third reaction system performs the sewage treatment program, and the remaining two reaction systems perform the sewage treatment program or continue to perform the intermittent aeration program;

[0042] When two of the first reaction system, the second reaction system, and the third reaction system execute the intermittent aeration program, the other reaction system executes the sewage treatment program. In the next cycle, when the real-time liquid level of the regulating tank meets the sewage treatment conditions, the reaction system with the larger number of aeration times among the two reaction systems executing the intermittent aeration program executes the sewage treatment program.

[0043] When one of the first reaction system, the second reaction system and the third reaction system executes the intermittent aeration program, the other two reaction systems execute the sewage treatment program. In the next cycle, when the real-time liquid level of the regulating tank meets the sewage treatment conditions, the reaction system executing the intermittent aeration program executes the sewage treatment program.

[0044] In summary, this application includes at least one of the following beneficial technical effects:

[0045] 1. The liquid level in the regulating tank is monitored in real time by a liquid level gauge within the regulating tank. The real-time liquid level is compared with a preset liquid level. Based on the comparison result, the first aeration assembly is controlled to perform intermittent aeration, so that the first aeration assembly performs intermittent aeration during any cycle of the first reaction system. In this way, when the water inflow of the sewage treatment system is insufficient and the first water inlet assembly is not receiving water, the first aeration assembly within the first reaction tank performs intermittent aeration of the first reaction tank, ensuring the activity of the first reaction tank in a "static" state, thereby improving the reaction efficiency of the first reaction tank and the entire first reaction system.

[0046] 2. By setting multiple intermittent aeration cycles within a cycle and setting corresponding intermittent aeration conditions, the reaction activity of the first reaction system is guaranteed, while energy consumption and operating loss of the first aeration component are reduced, thereby extending the service life of the first aeration component;

[0047] 3. By setting up two reaction systems for sewage treatment, and allowing the two reaction systems to perform sewage treatment and intermittent aeration in rotation when the water inflow is insufficient, the reaction activity of the entire sewage treatment system is improved, as well as the working balance of the first reaction system and the second reaction system;

[0048] 4. Through forced rotation, the first reaction system and the second reaction system are cyclically used for sewage treatment, thereby avoiding the imbalance phenomenon that one of the first reaction system and the second reaction system is subjected to sewage treatment for a long time while the other is subjected to intermittent aeration for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 This is a structural block diagram of the first reaction system in Example 1 of the present application.

[0050] Figure 2 This is the first flow chart of the control method of the sewage treatment system in Example 1 of the present application.

[0051] Figure 3 This is the second flow chart of the control method of the sewage treatment system in Example 1 of the present application.

[0052] Figure 4 This is the third flow chart of the control method for the sewage treatment system in Example 1 of the present application.

[0053] Figure 5 This is the fourth flow chart of the control method of the sewage treatment system in Example 2 of the present application.

[0054] Figure 6 This is a structural block diagram of the sewage treatment system in Example 3 of the present application.

[0055] Figure 7 This is a structural block diagram of the sewage treatment system in Example 4 of the present application.

[0056] Description of reference numerals:

[0057] 1. Controller; 10. First reaction system; 11. Regulating tank; 111. Liquid level gauge; 12. First reaction tank; 121. First aeration assembly; 13. First water inlet assembly; 20. Second reaction system; 22. Second reaction tank; 221. Second aeration assembly; 23. Second water inlet assembly; 30. Third reaction system; 32. Third reaction tank; 321. Third aeration assembly; 33. Third water inlet assembly. DETAILED DESCRIPTION

[0058] The following is combined with Figure 1-7 This application is described in further detail.

[0059] The embodiment of the present application discloses a control method for a sewage treatment system.

[0060] Example 1

[0061] Reference Figure 1The sewage treatment system of the embodiment of the present application includes a controller 1 and a first reaction system 10. The first reaction system 10 includes a regulating tank 11, a first reaction tank 12, and a first water inlet assembly 13. The regulating tank 11 is provided with a liquid level gauge 111, and the first reaction tank 12 is provided with a first aeration assembly 121. The first reaction tank 12 is located downstream of the regulating tank 11. The first water inlet assembly 13 connects the regulating tank 11 and the first reaction tank 12. The controller 1 is used to control the operation of the first water inlet assembly 13 and the first aeration assembly 121. The controller 1 stores a first sewage treatment program for controlling the first reaction system 10 to perform normal sewage treatment, and a first intermittent aeration program for controlling the first aeration assembly 121 to perform intermittent aeration. The first sewage treatment program and the first intermittent aeration program are two independent programs.

[0062] The cycle period described below in this embodiment corresponds to the first sewage treatment procedure, and the intermittent aeration period corresponds to the first intermittent aeration procedure. The cycle period is the minimum reaction period when the first reaction system 10 performs sewage treatment, including the water intake stage, the reaction stage, the sedimentation stage, the drainage stage and the idle stage. In one cycle period, the first water inlet component 13 takes in water, and the first reaction system 10 performs normal sewage treatment operations; the first water inlet component 13 does not take in water, and the first reaction system 10 is in a "stationary" state, that is, in the water intake stage, the reaction stage, the sedimentation stage, the drainage stage and the idle stage, all equipment structures of the first reaction system 10 do not work. An intermittent aeration cycle includes an aeration stage and a stop aeration stage, and the ratio of the duration of the aeration stage to the duration of the stop aeration stage is in the range of 1:5-1:2; the duration of an intermittent aeration cycle is greater than or equal to the single water intake duration of the first reaction tank 12.

[0063] Reference Figure 2 The control method of this embodiment includes the following steps B1 to B3.

[0064] Step B1: monitor the real-time liquid level in the regulating tank 11 through the liquid level meter 111.

[0065] Specifically, the liquid level in the regulating tank 11 is detected before each cycle of the first reaction system 10 begins; and the liquid level in the regulating tank 11 is detected before each intermittent aeration cycle of the first reaction system 10 begins. In this way, the operation of the first reaction system 10 can be guided by the liquid level during each cycle and each intermittent aeration cycle.

[0066] Step B2, compare the real-time liquid level with the preset liquid level to obtain a comparison result; wherein, the preset liquid level includes a low liquid level, a high liquid level, and a protection liquid level, the high liquid level is greater than the sum of the low liquid level and the protection liquid level, and the protection liquid level is the liquid level change of the regulating tank 11 corresponding to the single water inflow of the first reaction tank 12.

[0067] Specifically, the real-time liquid level is compared with the sum of the high liquid level, the low liquid level and the protection liquid level, and the low liquid level, to obtain a comparison result. In this way, by setting four liquid level levels, the operation of the first reaction system 10 can be more accurately controlled.

[0068] The single water inflow of the first reaction tank 12 in this embodiment is defined as the water inflow into the first reaction tank 12 during a normal wastewater treatment operation of the first reaction system 10 within one cycle. The protection level is the liquid level in the regulating tank 11 corresponding to the amount of water inflow placed in the regulating tank 11.

[0069] Step B3: Based on the comparison results, the controller 1 controls the first reaction system 10 to execute the first sewage treatment process or controls the first aeration assembly 121 to execute the first intermittent aeration process. The first aeration assembly 121 performs intermittent aeration during any cycle of the first reaction system 10. This ensures that the first aeration assembly 121 performs intermittent aeration regardless of the real-time liquid level range of the regulating tank 11. Specifically, when the first reaction system 10 is performing the normal first sewage treatment process or in a "resting" state, the first aeration assembly 121 performs intermittent aeration of the first reaction tank 12, ensuring the reaction activity of the first reaction tank 12 and improving the efficiency of the first reaction system 10.

[0070] Please refer to Figure 3 , step B3 specifically includes the following steps B31 to B34.

[0071] Step B31: In a cycle, when the real-time liquid level is greater than or equal to the high liquid level, the controller 1 issues a high liquid level alarm. At this time, neither the first sewage treatment program nor the first intermittent aeration program is executed.

[0072] Step B32: During a cycle, if the real-time liquid level is less than the high liquid level and greater than or equal to the sum of the low liquid level and the protection liquid level, controller 1 controls first reaction system 10 to execute the first sewage treatment process. At this point, first reaction system 10 performs normal sewage treatment, and first water inlet assembly 13 infuses water from the reaction tank into first reaction tank 12. The first intermittent aeration process is not executed.

[0073] Step B33: Within a cycle, when the real-time liquid level is less than the sum of the low liquid level and the protection liquid level, and is greater than or equal to the low liquid level, the controller 1 controls the first aeration component 121 to execute the first intermittent aeration program according to the liquid level change of the regulating tank 11 within the previous intermittent aeration cycle.

[0074] Please refer to Figure 4 , step B33 specifically includes the following steps B331 to B333.

[0075] Step B331: During the first intermittent aeration cycle, controller 1 controls first aeration assembly 121 to perform intermittent aeration. Thus, at the beginning of a cycle, if the real-time liquid level is less than the sum of the low liquid level and the protection liquid level, but greater than or equal to the low liquid level, controller 1 controls first aeration assembly 121 to directly perform intermittent aeration during the first intermittent aeration cycle. This ensures intermittent aeration of first reaction system 10 during this "resting" cycle, thereby maintaining the reactivity of first reaction system 10.

[0076] Step B332: When the next intermittent aeration cycle begins, the real-time liquid level is less than the high liquid level and greater than or equal to the sum of the low liquid level and the protection liquid level. During the next intermittent aeration cycle, the controller 1 controls the first aeration assembly 121 to cease the first intermittent aeration process. At this point, the liquid level in the regulating tank 11 meets the inflow conditions for the first reaction tank 12 in the next cycle. This means that the first reaction system 10 will continue normal sewage treatment operations in the next cycle. Therefore, cessation of intermittent aeration during the next intermittent aeration cycle reduces energy consumption and operating losses of the first aeration assembly 121 while maintaining the reaction activity of the first reaction system 10, thereby increasing the service life of the first aeration assembly 121.

[0077] Step B333: When the next intermittent aeration cycle begins, the real-time liquid level is less than the sum of the low liquid level and the protection liquid level, but greater than or equal to the low liquid level. During the next intermittent aeration cycle, the controller 1 controls the first aeration assembly 121 to perform intermittent aeration. At this point, the liquid level in the regulating tank 11 still does not meet the inlet conditions for the first reaction tank 12 in the next cycle. That is, the first reaction system 10 may remain in a "stationary" state during the next cycle. Therefore, the first aeration assembly 121 continues to perform intermittent aeration during the next intermittent aeration cycle, maintaining the reaction activity of the first reaction system 10.

[0078] Step B34: within a cycle, when the real-time liquid level is lower than the low liquid level, the controller 1 controls the first aeration assembly 121 to perform intermittent aeration and issues a low liquid level alarm.

[0079] The control method of the sewage treatment system provided in Example 1 of the present application further includes: when the first water inlet component 13 fails, the controller 1 issues a fault alarm and controls the first aeration component 121 to perform intermittent aeration until the first water inlet component 13 works normally.

[0080] The real-time principle of a control method for a sewage treatment system provided in Example 1 of the present application is as follows: the liquid level of the regulating tank 11 is monitored in real time by a liquid level meter 111 provided in the regulating tank 11, and the monitored real-time liquid level is compared with a preset liquid level. Based on the comparison result, the first aeration component 121 is controlled to perform intermittent aeration, so that the first aeration component 121 performs intermittent aeration in any cycle of the first reaction system 10; in this way, when the water inflow of the sewage treatment system is insufficient and the first water inlet component 13 does not take in water, the first aeration component 121 in the first reaction tank 12 performs intermittent aeration on the first reaction tank 12, thereby ensuring the activity of the first reaction tank 12 in a "static" state, thereby improving the reaction efficiency of the first reaction tank 12 and even the entire first reaction system 10.

[0081] The following describes in more detail the control method for the sewage treatment system provided in Example 1 of this application, using a specific application scenario. The first reaction system 10 has a cycle of 3 hours, corresponding to 3 intermittent aeration cycles. Each intermittent aeration cycle lasts 1 hour, with an aeration phase lasting 10 minutes and a non-aeration phase lasting 50 minutes. The single water inflow time of the first reaction tank 12 is 0.5 hours. The low liquid level of the regulating tank 11 is 7 liters, the high liquid level is 10 liters, and the protective liquid level is 1 liter.

[0082] At the beginning of each cycle, the first real-time liquid level of the regulating tank 11 is detected. When the first real-time liquid level is greater than or equal to 10 liters, the controller 1 issues a high liquid level warning.

[0083] When the first real-time liquid level is less than 10 liters and greater than or equal to 8 liters, the first sewage treatment program is started, and the controller 1 controls the first water inlet component 13 to inlet water from the regulating tank 11 into the first reaction tank 12 .

[0084] When the first real-time liquid level is less than 8 liters and greater than or equal to 7 liters, the first reaction system 10 executes the first intermittent aeration process instead of the first sewage treatment process. During the first intermittent aeration cycle, the controller 1 controls the first aeration assembly 121 to perform intermittent aeration. At the beginning of the second intermittent aeration cycle, the liquid level meter 111 detects the second real-time liquid level in the regulating tank 11. When the second real-time liquid level is greater than 10 liters, the controller 1 issues a high liquid level warning. When the second real-time liquid level is less than 10 liters and greater than or equal to 8 liters, the first intermittent aeration process is terminated. When the second real-time liquid level is less than 8 liters and greater than or equal to 7 liters, the controller 1 controls the first aeration assembly 121 to continue intermittent aeration. At the beginning of the third intermittent aeration cycle, the liquid level meter 111 detects the third real-time liquid level of the regulating tank 11. When the third real-time liquid level is greater than 10 liters, the controller 1 issues a high liquid level warning; when the third real-time liquid level is less than 10 liters and greater than or equal to 8 liters, the first intermittent aeration program is stopped; when the third real-time liquid level is less than 8 liters and greater than or equal to 7 liters, the controller 1 controls the first aeration component 121 to perform intermittent aeration.

[0085] When the first real-time liquid level is less than 7 liters, the controller 1 controls the first aeration assembly 121 to perform intermittent aeration and issues a low liquid level alarm.

[0086] The next cycle repeats the steps of the previous cycle in sequence, and so on.

[0087] Example 2

[0088] The content of Example 2 is basically the same as that of Example 1. The same or similar parts between Example 2 and Example 1 will not be repeated here. The difference is that step B33 specifically includes the following steps B334 to B336. Please refer to Figure 5 .

[0089] Step B334: During the first intermittent aeration cycle, controller 1 controls first aeration assembly 121 to perform intermittent aeration. Thus, at the beginning of a cycle, if the real-time liquid level is less than the sum of the low liquid level and the protection liquid level, but greater than or equal to the low liquid level, controller 1 controls first aeration assembly 121 to directly perform intermittent aeration during the first intermittent aeration cycle. This ensures intermittent aeration of first reaction system 10 during this "resting" cycle, thereby maintaining the reactivity of first reaction system 10.

[0090] Step B335: When the increase in the real-time liquid level during the previous intermittent aeration cycle is greater than or equal to the protection liquid level, the controller 1 controls the first aeration assembly 121 to cease the first intermittent aeration process during the next intermittent aeration cycle. At this point, the liquid level in the regulating tank 11 is less than the high liquid level and greater than or equal to the sum of the low liquid level and the protection liquid level. This satisfies the inflow conditions for the first reaction tank 12 during the next cycle, meaning that the first reaction system 10 will continue normal sewage treatment operations during the next cycle. Therefore, cessation of intermittent aeration during the next intermittent aeration cycle reduces energy consumption and operating losses of the first aeration assembly 121 while maintaining the reaction activity of the first reaction system 10, thereby increasing the service life of the first aeration assembly 121.

[0091] Step B336: If the increase in the real-time liquid level during the previous intermittent aeration cycle is less than the protective liquid level, controller 1 controls first aeration assembly 121 to perform intermittent aeration during the next intermittent aeration cycle. At this point, the amount of water entering regulating tank 11 during the previous intermittent aeration cycle is relatively low, and the real-time liquid level in regulating tank 11 may not meet the inflow requirements for first reaction tank 12 during the next cycle. Therefore, first aeration assembly 121 continues intermittent aeration during the next intermittent aeration cycle, maintaining the reactivity of first reaction system 10.

[0092] Example 3

[0093] Reference Figure 6 , the content of Example 3 is basically the same as that of Example 1 and Example 2, and the same or similar parts of Example 3 and Example 1 and Example 2 are not repeated here. The difference is that: the sewage treatment system of Example 3 also includes a second reaction system 20, and the cycle period of the second reaction system 20 is the same as the cycle period of the first reaction system 10. The cycle period of the second reaction system 20 is staggered with the cycle period of the first reaction system 10, and the staggered time is greater than or equal to the water inlet time of the first reaction tank 12; the second reaction system 20 includes a regulating tank 11, a second reaction tank 22 and a second water inlet component 23, a second aeration component 221 is provided in the second reaction tank 22, the second reaction tank 22 is located downstream of the regulating tank 11, and the second water inlet component 23 is connected to the regulating tank 11 and the second reaction tank 22, and the controller 1 also stores a second sewage treatment program for controlling the second reaction system 20 to perform sewage treatment, and a second intermittent aeration program for controlling the second aeration component 221 to perform intermittent aeration.

[0094] The control method of the second reaction system 20 is the same as the control method of the first reaction system 10 , and may refer to Example 1 or Example 2 for details.

[0095] The first difference between the sewage treatment system control method of Example 3 and the sewage treatment system control methods of Examples 1 and 2 is that: when the first reaction system 10 performs the first intermittent aeration process for multiple consecutive cycles, and the second reaction system 20 performs the second sewage treatment process for one or more consecutive cycles, in the next cycle, when the liquid level in the regulating tank 11 meets the sewage treatment conditions, the first reaction system 10 performs the first sewage treatment process, and the second reaction system 20 performs the second intermittent aeration process. In this way, forced rotation causes the first reaction system 10 and the second reaction system 20 to cycle through sewage treatment, avoiding the imbalance caused by one of the first reaction system 10 and the second reaction system 20 performing sewage treatment for a long period of time while the other performs intermittent aeration for a long period of time. The multiple cycles described in this embodiment include, but are not limited to, two cycles, three cycles, four cycles, etc.

[0096] For example, when the cycle of the first reaction system 10 lags behind the cycle of the second reaction system 20 by 0.5 hours, the first reaction system 10 performs the first intermittent aeration program during both the first and second cycles, while the second reaction system 20 performs the first sewage treatment program during the first and / or second cycles. At the beginning of the third cycle of the second reaction system 20, the real-time liquid level of the equalization tank 11 is less than the high liquid level and greater than or equal to the sum of the low liquid level and the protection liquid level, forcing a rotation. The controller 1 controls the second reaction system 20 to perform the first intermittent aeration program during the third cycle, while controlling the first reaction system 10 to perform the first sewage treatment program during the third cycle.

[0097] The second difference is that when the first reaction system 10 is performing the first intermittent aeration process and the second reaction system 20 is performing the second intermittent aeration process, in the next cycle, when the liquid level in the regulating tank 11 meets the sewage treatment conditions, the reaction system with the higher number of intermittent aeration cycles will perform the sewage treatment process, while the other reaction system will perform the sewage treatment process or continue to perform the intermittent aeration process. This forces the reaction system with the higher number of intermittent aeration cycles to perform sewage treatment, thus balancing the work of the first and second reaction systems 10 and 20.

[0098] For example, if the cycle of the first reaction system 10 lags behind that of the second reaction system 20 by 0.5 hours, the first reaction system 10 will perform the first intermittent aeration procedure during both the first and second cycles, while the second reaction system 20 will perform the second intermittent aeration procedure during both the first and second cycles. At the start of the third cycle of the second reaction system 20, the real-time liquid level in the equalization tank 11 is less than the high level and greater than or equal to the sum of the low level and the protection level. If the number of aerations in the first reaction system 10 exceeds that in the second reaction system 20 during the first and second cycles, the second reaction system 20 will perform the second intermittent aeration procedure during the third cycle, while the first reaction system 10 will perform the first sewage treatment procedure during the third cycle. If the aeration times of the second reaction system 20 are greater than those of the first reaction system 10 during the first and second cycle periods, the second reaction system 20 executes the second sewage treatment procedure during the third cycle period; when the third cycle period of the first reaction system 10 begins, the real-time liquid level of the equalization tank 11 is less than the high liquid level and is greater than or equal to the sum of the low liquid level and the protection liquid level, the first reaction system 10 executes the first sewage treatment procedure during the third cycle period; when the third cycle period of the first reaction system 10 begins, the real-time liquid level of the equalization tank 11 is less than the sum of the low liquid level and the protection liquid level and is greater than or equal to the low liquid level, the first reaction system 10 executes the first intermittent aeration procedure during the third cycle period.

[0099] The implementation principle of Example 3 of the present application is: by setting up two reaction systems for sewage treatment, and allowing the two reaction systems to perform sewage treatment and intermittent aeration in rotation when the water intake is insufficient, the reaction activity of the entire sewage treatment system and the working balance of the first reaction system 10 and the second reaction system 20 are improved.

[0100] Example 4

[0101] Reference Figure 7, the contents of Example 4 are basically the same as those of Example 3, and the same or similar parts as those of Example 3 are not repeated here. The difference is that: the sewage treatment system of Example 4 also includes a third reaction system 30, the cycle period of the third reaction system 30 is the same as the cycle period of the second reaction system 20, the cycle period of the third reaction system 30 is staggered with the cycle period of the second reaction system 20, and the cycle period of the third reaction system 30 is staggered with the cycle period of the first reaction system 10, and the staggered time is greater than or equal to the water inflow time of the first reaction tank 12; the third reaction system 30 includes a regulating tank 11, a third reaction tank 32 and a third water inlet component 33, a third aeration component 321 is provided in the third reaction tank 32, the third reaction tank 32 is located downstream of the regulating tank 11, the third water inlet component 33 connects the regulating tank 11 and the third reaction tank 32, and the controller 1 also stores a third sewage treatment program for controlling the third reaction system 30 to perform sewage treatment, and a third intermittent aeration program for controlling the third aeration component 321 to perform intermittent aeration.

[0102] The control method of the third reaction system 30 is the same as the control method of the first reaction system 10 , and may refer to Example 1 or Example 2 for details.

[0103] The first difference between the control method of the sewage treatment system of Example 4 and the control method of the sewage treatment system of Example 3 is that: when the first reaction system 10, the second reaction system 20 and the third reaction system 30 all execute the intermittent aeration program, in the next cycle, when the real-time liquid level of the regulating tank 11 meets the sewage treatment conditions, the reaction system with more intermittent aeration times among the first reaction system 10, the second reaction system 20 and the third reaction system 30 executes the sewage treatment program, and the other two reaction systems execute the sewage treatment program or continue to execute the intermittent aeration program.

[0104] The second difference is that when two of the first reaction system 10, the second reaction system 20 and the third reaction system 30 execute the intermittent aeration program, and the other reaction system executes the sewage treatment program, in the next cycle, when the real-time liquid level of the regulating tank 11 meets the sewage treatment conditions, rotation is forced, and the reaction system with more aeration times among the two reaction systems executing the intermittent aeration program executes the sewage treatment program.

[0105] The third difference is that when one of the first reaction system 10, the second reaction system 20 and the third reaction system 30 executes the intermittent aeration program, the other two reaction systems execute the sewage treatment program. In the next cycle, when the real-time liquid level of the regulating tank 11 meets the sewage treatment conditions, forced rotation is performed, and the reaction system executing the intermittent aeration program executes the sewage treatment program.

[0106] In other embodiments, the sewage treatment system described in the embodiments of the present application may further include a fourth reaction system, a fifth reaction system, a sixth reaction system, and the like. The control method of the corresponding sewage treatment system can refer to the above-mentioned embodiments 1 to 4, and be designed accordingly on this basis. The improvements made on the basis of the disclosure of the above-mentioned embodiments also belong to the technical content claimed to be protected by this application and will not be elaborated here.

[0107] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A control method for a sewage treatment system, characterized in that: The sewage treatment system comprises a controller (1) and a first reaction system (10), wherein the first reaction system (10) comprises a regulating tank (11), a first reaction tank (12) and a first water inlet component (13), wherein a liquid level meter (111) is provided in the regulating tank (11), and a first aeration component (121) is provided in the first reaction tank (12), wherein the first reaction tank (12) is located downstream of the regulating tank (11), and the first water inlet component (13) is connected to the regulating tank (11) and the first reaction tank (12), and wherein the controller (1) stores information for controlling the first reaction system (10) to perform sewage treatment. The first sewage treatment program and the first intermittent aeration program for controlling the first aeration component (121) to perform intermittent aeration are two independent programs. The cycle period corresponds to the first sewage treatment program, and the intermittent aeration period corresponds to the first intermittent aeration program. The cycle period is the minimum reaction period when the first reaction system performs sewage treatment, including the water inlet stage, the reaction stage, the sedimentation stage, the drainage stage and the idle stage. During any cycle period of the first reaction system (10), the first aeration component (121) performs intermittent aeration. The control method includes: Monitoring the real-time liquid level in the regulating tank (11) by means of the liquid level meter (111); Comparing the real-time liquid level with the preset liquid level to obtain a comparison result; the preset liquid level includes a low liquid level, a high liquid level, and a protection liquid level, the protection liquid level being the liquid level change of the regulating tank (11) corresponding to a single water inflow of the first reaction tank (12), and the high liquid level being greater than the sum of the low liquid level and the protection liquid level; During one cycle of the first sewage treatment process: When the real-time liquid level is greater than or equal to the high liquid level, the controller (1) issues a high liquid level alarm; When the real-time liquid level is less than the high liquid level and greater than or equal to the sum of the low liquid level and the protection liquid level, the controller (1) controls the first reaction system (10) to execute the first sewage treatment procedure; When the real-time liquid level is less than the sum of the low liquid level and the protection liquid level, and is greater than or equal to the low liquid level, the controller (1) controls the first aeration component (121) to execute the first intermittent aeration program according to the liquid level change of the regulating tank (11) in the previous intermittent aeration cycle; When the real-time liquid level is lower than the low liquid level, the controller (1) controls the first aeration component (121) to execute the first intermittent aeration program and issues a low liquid level alarm; The controller (1) controls the first aeration component (121) to execute the first intermittent aeration program according to the change in the liquid level of the regulating tank (11) during the previous intermittent aeration cycle, comprising: During the first intermittent aeration cycle, the controller (1) controls the first aeration component (121) to perform intermittent aeration; When the next intermittent aeration cycle begins, if the real-time liquid level is less than the high liquid level and greater than or equal to the sum of the low liquid level and the protection liquid level, then in the next intermittent aeration cycle, the controller (1) controls the first aeration component (121) to stop executing the first intermittent aeration program; When the next intermittent aeration cycle begins, if the real-time liquid level is less than the sum of the low liquid level and the protection liquid level, and is greater than or equal to the low liquid level, then in the next intermittent aeration cycle, the controller (1) controls the first aeration component (121) to perform intermittent aeration; Wherein, one cycle corresponds to one or more intermittent aeration cycles.

2. A control method for a sewage treatment system, characterized in that: The sewage treatment system comprises a controller (1) and a first reaction system (10), wherein the first reaction system (10) comprises a regulating tank (11), a first reaction tank (12) and a first water inlet component (13), wherein a liquid level meter (111) is provided in the regulating tank (11), and a first aeration component (121) is provided in the first reaction tank (12), wherein the first reaction tank (12) is located downstream of the regulating tank (11), and the first water inlet component (13) is connected to the regulating tank (11) and the first reaction tank (12), and wherein the controller (1) stores information for controlling the first reaction system (10) to perform sewage treatment. The first sewage treatment program and the first intermittent aeration program for controlling the first aeration component (121) to perform intermittent aeration are two independent programs. The cycle period corresponds to the first sewage treatment program, and the intermittent aeration period corresponds to the first intermittent aeration program. The cycle period is the minimum reaction period when the first reaction system performs sewage treatment, including the water inlet stage, the reaction stage, the sedimentation stage, the drainage stage and the idle stage. During any cycle period of the first reaction system (10), the first aeration component (121) performs intermittent aeration. The control method includes: Monitoring the real-time liquid level in the regulating tank (11) by means of the liquid level meter (111); Comparing the real-time liquid level with a preset liquid level to obtain a comparison result; the preset liquid level includes a low liquid level, a high liquid level, and a protection liquid level, the protection liquid level being the liquid level change of the regulating tank (11) corresponding to a single water inflow of the first reaction tank (12), and the high liquid level being greater than the sum of the low liquid level and the protection liquid level; During one cycle of the first sewage treatment process: When the real-time liquid level is greater than or equal to the high liquid level, the controller (1) issues a high liquid level alarm; When the real-time liquid level is less than the high liquid level and greater than or equal to the sum of the low liquid level and the protection liquid level, the controller (1) controls the first reaction system (10) to execute the first sewage treatment procedure; When the real-time liquid level is less than the sum of the low liquid level and the protection liquid level, and is greater than or equal to the low liquid level, the controller (1) controls the first aeration component (121) to execute the first intermittent aeration program according to the liquid level change of the regulating tank (11) in the previous intermittent aeration cycle; When the real-time liquid level is lower than the low liquid level, the controller (1) controls the first aeration component (121) to execute the first intermittent aeration program and issues a low liquid level alarm; The controller (1) controls the first aeration component (121) to execute the first intermittent aeration program according to the change in the liquid level of the regulating tank (11) during the previous intermittent aeration cycle, comprising: During the first intermittent aeration cycle, the controller (1) controls the first aeration component (121) to perform intermittent aeration; When the increase in the real-time liquid level in the previous intermittent aeration cycle is less than the protection liquid level, the controller (1) controls the first aeration component (121) to perform intermittent aeration in the next intermittent aeration cycle; When the increase in the real-time liquid level in the previous intermittent aeration cycle is greater than or equal to the protection liquid level, in the next intermittent aeration cycle, the controller (1) controls the first aeration component (121) to stop executing the first intermittent aeration program; Wherein, one cycle corresponds to one or more intermittent aeration cycles.

3. The control method according to claim 1 or 2, characterized in that: One intermittent aeration cycle includes an aeration phase and a non-aeration phase, and the ratio of the duration of the aeration phase to the duration of the non-aeration phase is in the range of 1:5-1:

2.

4. The control method according to claim 1 or 2, characterized in that: When the first water inlet component (13) fails, the controller (1) issues a fault alarm and controls the first aeration component (121) to execute a first intermittent aeration program until the first water inlet component (13) returns to normal.

5. The control method according to claim 1 or 2, characterized in that: The sewage treatment system further comprises a second reaction system (20) connected in parallel with the first reaction system (10), wherein the cycle of the second reaction system (20) is the same as the cycle of the first reaction system (10), and the cycle of the second reaction system (20) is staggered with the cycle of the first reaction system (10), and the staggered time is greater than or equal to the water inlet time of the first reaction tank (12); the second reaction system (20) comprises the regulating tank (11), the second reaction tank (22) and the second water inlet component (23), the second reaction tank (22) is provided with a second aeration component (221), the second reaction tank (22) is located downstream of the regulating tank (11), the second water inlet component (23) is connected to the regulating tank (11) and the second reaction tank (22), and the controller (1) further stores a second sewage treatment program for controlling the second reaction system (20) to perform sewage treatment, and a second intermittent aeration program for controlling the second aeration component (221) to perform intermittent aeration; The control method of the second reaction system (20) is the same as the control method of the first reaction system (10).

6. The control method according to claim 5, wherein: When the first reaction system (10) executes the first intermittent aeration program within a plurality of consecutive cycle periods, and the second reaction system (20) executes the second sewage treatment program within one or a plurality of consecutive cycle periods, in the next cycle period, when the real-time liquid level of the regulating tank (11) meets the sewage treatment conditions, the first reaction system (10) executes the first sewage treatment program, and the second reaction system (20) executes the second intermittent aeration program.

7. The control method according to claim 5, wherein: When the first reaction system (10) executes the first intermittent aeration program and the second reaction system (20) executes the second intermittent aeration program, in the next cycle, when the real-time liquid level of the regulating tank (11) meets the sewage treatment condition, the reaction system with more intermittent aeration times between the first reaction system (10) and the second reaction system (20) executes the sewage treatment program, and the other reaction system executes the sewage treatment program or continues to execute the intermittent aeration program.

8. The control method according to claim 5, wherein: The sewage treatment system further comprises a third reaction system (30) connected in parallel with the first reaction system (10) and the second reaction system (20); the cycle of the third reaction system (30) is the same as the cycle of the second reaction system (20); the cycle of the third reaction system (30) is staggered with the cycle of the second reaction system (20); the cycle of the third reaction system (30) is staggered with the cycle of the first reaction system (10); and the staggered time is greater than or equal to the water inflow time of the second reaction tank (22); the third reaction system (30) comprises the regulating tank (11), the third reaction tank (32) and the third water inflow component (33); the third reaction tank (32) is provided with a third aeration component (321); the third reaction tank (32) is located downstream of the regulating tank (11); the third water inflow component (33) connects the regulating tank (11) and the third reaction tank (32); the control method of the third reaction system (30) is the same as the control method of the first reaction system (10); When the first reaction system (10), the second reaction system (20) and the third reaction system (30) all execute the intermittent aeration program, in the next cycle, when the real-time liquid level of the regulating tank (11) meets the sewage treatment condition, the reaction system with the greater number of intermittent aeration times among the first reaction system (10), the second reaction system (20) and the third reaction system (30) executes the sewage treatment program, and the remaining two reaction systems execute the sewage treatment program or continue to execute the intermittent aeration program; When two of the first reaction system (10), the second reaction system (20) and the third reaction system (30) execute the intermittent aeration program, and the other reaction system executes the sewage treatment program, in the next cycle, when the real-time liquid level of the regulating tank (11) meets the sewage treatment condition, the reaction system with the greater number of aeration times among the two reaction systems executing the intermittent aeration program executes the sewage treatment program; When one of the first reaction system (10), the second reaction system (20) and the third reaction system (30) executes the intermittent aeration program, the other two reaction systems execute the sewage treatment program. In the next cycle, when the real-time liquid level of the regulating tank (11) meets the sewage treatment conditions, the reaction system executing the intermittent aeration program executes the sewage treatment program.

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