Wastewater discharge control method, device and system for wastewater storage tank

Abstract

The invention is suitable for the technical field of automatic control, and provides a wastewater discharge control method, device and system for a wastewater storage pool, and the method comprises the steps: obtaining the current liquid level value of the wastewater storage pool and the current flow value of each water inlet, and determining the current existence state of wastewater in the wastewater storage pool; according to the current liquid level value and the current flow value of each water inlet, determining a first duration required for rising from the current liquid level value to a preset safe liquid level value, and predicting a second duration required for stirring the wastewater to a uniform mixing state; under the condition that the second duration is less than or equal to the first duration, determining a first starting moment of the wastewater stirring equipment, and determining a second starting moment of the drainage pump; controlling the wastewater stirring equipment to start stirring the wastewater at the first starting moment; and the target drainage pump is started at the second starting moment to convey the wastewater to the target wastewater treatment device, so that automatic discharge control of the wastewater is realized, the phenomenon of wastewater overflow is reduced, and the labor cost is saved.

Description

Technical Field

[0001] The present application belongs to the field of automation control technology, and in particular, relates to a wastewater discharge control method, device and system for a wastewater storage tank. Background Art

[0002] In order to 2 ) To properly treat the industrial wastewater generated during the production process, avoid wasting resources by repeatedly building wastewater treatment equipment, improve the utilization rate of existing wastewater treatment equipment, and reduce the vacancy rate of existing wastewater treatment equipment, usually liquid CO 2 The wastewater generated during the production process is collected in the wastewater storage tank in the factory area. When the wastewater storage tank is almost full, the wastewater in the wastewater storage tank is transported to the existing wastewater treatment device through the wastewater transmission pipeline for centralized treatment.

[0003] However, the prior art usually requires manual inspection of the liquid level of the wastewater storage tank, and manually opening the drainage pump when the wastewater storage tank is almost full to transport the wastewater to the wastewater treatment device. This is not only cumbersome to operate and has high labor costs; it is also easy to cause overflow due to untimely wastewater transportation, causing environmental pollution. Summary of the invention

[0004] In view of this, the embodiments of the present application provide a wastewater discharge control method, device and system for a wastewater storage tank to solve the technical problems of the existing wastewater discharge control method having high labor costs and prone to wastewater overflow.

[0005] In a first aspect, an embodiment of the present application provides a method for controlling wastewater discharge from a wastewater storage tank, comprising:

[0006] When all drainage pumps of the wastewater storage tank are turned off, the current liquid level value of the wastewater storage tank and the current flow value of each water inlet are obtained, and the current existence state of the wastewater in the wastewater storage tank is determined; the existence state of the wastewater includes a stratified state, a partially stratified state and a uniformly mixed state;

[0007] Determine, based on the current liquid level value and the current flow value of each of the water inlets, a first time required for the wastewater storage tank to rise from the current liquid level value to a preset safety liquid level value; the preset safety liquid level value is less than the depth of the wastewater storage tank;

[0008] When the current state is not the uniformly mixed state, predicting a second time required to stir the wastewater to the uniformly mixed state;

[0009] When the second time duration is less than or equal to the first time duration, a first start time of the wastewater mixing device is determined according to the current time, the first time duration and the second time duration, and a second start time of the drainage pump is determined according to the current time and the first time duration; the first start time is earlier than the second start time;

[0010] Controlling the wastewater stirring device to start stirring the wastewater at the first start time;

[0011] The target drainage pump is turned on at the second start time to transport the wastewater to the target wastewater treatment device through the target water outlet pipe.

[0012] In an optional implementation of the first aspect, the method further includes:

[0013] When the second time period is greater than the first time period, controlling the wastewater stirring device to start stirring the wastewater;

[0014] During the stirring process of the wastewater, if the current liquid level value rises to the preset safe liquid level value, all the drainage pumps are turned on to transport the wastewater to each wastewater treatment device through each outlet pipe.

[0015] In an optional implementation of the first aspect, turbidity sensors are installed at multiple different depth points of the inner wall of the wastewater storage tank; correspondingly, determining the current state of wastewater in the wastewater storage tank includes:

[0016] Acquiring the current turbidity value of the wastewater collected by each of the turbidity sensors;

[0017] Calculating a first turbidity difference between the maximum current turbidity value and the minimum current turbidity value, calculating a second turbidity difference between the current turbidity values ​​corresponding to each two adjacent depth points, and calculating a standard deviation of all the current turbidity values;

[0018] In the case where the first turbidity difference is greater than a first turbidity threshold, and at least one of the second turbidity difference is greater than a second turbidity threshold, determining that the current existing state is the stratified state; the second turbidity threshold is used to describe the minimum turbidity difference value at which the wastewater can produce stratification, and the first turbidity threshold is greater than the second turbidity threshold;

[0019] When the first turbidity difference is less than the third turbidity threshold, and the standard deviation is less than the first standard deviation threshold, the current existing state is determined to be the uniform mixing state; the third turbidity threshold is used to describe the maximum turbidity difference value between different depth points when the wastewater is in the uniform mixing state, and the first standard deviation threshold is used to describe the maximum turbidity standard deviation allowed when the wastewater is in the uniform mixing state;

[0020] When the first turbidity difference is greater than or equal to the third turbidity threshold and less than or equal to the first turbidity threshold, and the standard deviation is greater than the first standard deviation threshold, it is determined that the current existing state is the partial stratification state.

[0021] In an optional implementation of the first aspect, when the current existing state is not the uniformly mixed state, predicting a second time required to stir the wastewater to the uniformly mixed state includes:

[0022] Calculating an average of all said current turbidity values;

[0023] The second duration is predicted by the following formula according to the first turbidity difference, the average value, the impeller diameter of the wastewater mixing device, and the rotation speed of the wastewater mixing device:

[0024]

[0025] Where, ΔT 2 is the second time length, k is the preset adjustment coefficient, D is the impeller diameter, Δtrub is the first turbidity difference, N is the rotation speed, trub avg is the average value.

[0026] In an optional implementation of the first aspect, starting the target drainage pump at the second start-up time to transport the wastewater to the target wastewater treatment device through the target water outlet pipe includes:

[0027] For each outlet pipe corresponding to the drainage pump, determine the water delivery efficiency of each outlet pipe according to the historical total water delivery volume, pipe radius and pipe length of the outlet pipe;

[0028] Determine the water outlet pipeline with the highest water delivery efficiency as the target water outlet pipeline;

[0029] The target drainage pump corresponding to the target water outlet pipe is turned on at the second turn-on time.

[0030] In an optional implementation of the first aspect, determining the water delivery efficiency of each of the water outlet pipes according to the historical total water delivery volume, the pipe radius, and the pipe length of the water outlet pipes includes:

[0031] According to the total historical water delivery volume, the pipeline radius and the pipeline length, the water delivery efficiency of each of the outlet pipelines is determined by the following formula:

[0032]

[0033] Among them, E i is the water delivery efficiency of the ith outlet pipe, m is the number of outlet pipes, R i is the pipe radius of the i-th outlet pipe, V i is the total historical water delivery of the ith outlet pipeline, L i is the length of the i-th outlet pipe, w 1 、w 2 and w 3 are the weights of the pipeline radius, the historical total water delivery volume and the pipeline length, respectively, 1 、w 2 and w 3 The sum of is 1.

[0034] In an optional implementation of the first aspect, determining, according to the current liquid level value and the current flow value of each of the water inlets, a first time required for the wastewater storage tank to rise from the current liquid level value to a preset safety liquid level value comprises:

[0035] According to the current liquid level value and the current flow value of each water inlet, the first time required for the wastewater storage tank to rise from the current liquid level value to the preset safety liquid level value is determined by the following formula:

[0036]

[0037] Where, ΔT 1 is the first time length, A is the cross-sectional area of ​​the wastewater storage tank, H safe is the preset safety liquid level value, H now is the current liquid level value, Qin j is the water inlet flow value of the j-th water inlet, and n is the number of water inlets of the wastewater storage tank.

[0038] In a second aspect, an embodiment of the present application provides a wastewater discharge control device for a wastewater storage tank, comprising:

[0039] The first determination unit is used to obtain the current liquid level value of the wastewater storage tank and the current flow value of each water inlet when all the drainage pumps of the wastewater storage tank are turned off, and determine the current existence state of the wastewater in the wastewater storage tank; the existence state of the wastewater includes a stratified state, a partially stratified state and a uniformly mixed state;

[0040] A second determining unit is used to determine a first time required for the wastewater storage tank to rise from the current liquid level value to a preset safety liquid level value according to the current liquid level value and the current flow value of each of the water inlets; the preset safety liquid level value is less than the depth of the wastewater storage tank;

[0041] A prediction unit, configured to predict a second time required to stir the wastewater to the uniformly mixed state when the current existing state is not the uniformly mixed state;

[0042] a third determining unit, when the second time duration is less than or equal to the first time duration, determining a first start time of the wastewater mixing device according to a current time, the first time duration and the second time duration, and determining a second start time of the drainage pump according to the current time and the first time duration; the first start time is earlier than the second start time;

[0043] a first control unit, configured to control the wastewater stirring device to start stirring the wastewater at the first start time;

[0044] The second control unit is used to start the target drainage pump at the second start time to transport the wastewater to the target wastewater treatment device through the target water outlet pipe.

[0045] In a third aspect, an embodiment of the present application provides a wastewater discharge control device for a wastewater storage tank, comprising a memory and a computer program stored in the memory and executable on a processor, wherein when the processor executes the computer program, it implements the wastewater treatment control method as described in any optional implementation of the first aspect above.

[0046] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the wastewater treatment control method as described in any optional implementation of the first aspect above is implemented.

[0047] The wastewater discharge control method, device and system for the wastewater storage tank provided by the embodiments of the present application have the following beneficial effects:

[0048] The embodiment of the present application obtains the current liquid level value of the wastewater storage tank and the current flow value of each water inlet when all the drainage pumps of the wastewater storage tank are closed, and determines the current existence state of the wastewater in the wastewater storage tank; determines the first time required for the wastewater storage tank to rise from the current liquid level value to the preset safety liquid level value according to the current liquid level value and the current flow value of each water inlet; predicts the second time required to stir the wastewater to a uniformly mixed state when the current existence state is not a uniformly mixed state; determines the first start time of the wastewater stirring device according to the current time, the first time and the second time when the second time is less than or equal to the first time, and determines the second start time of the drainage pump according to the current time and the first time. By controlling the stirring device to start stirring the wastewater at the first start time, the wastewater can be in a uniformly mixed state when it is discharged, which can improve the wastewater discharge efficiency, avoid the blockage of the outlet pipe, and improve the stability of the entire wastewater discharge control system. By starting the target drainage pump at the second moment, the wastewater can be transported to the target wastewater treatment device through the target water outlet pipe before the current liquid level value of the wastewater storage tank exceeds the safe liquid level value, thereby reducing the wastewater overflow phenomenon and reducing the pollution of the environment by the wastewater. It can be seen that the wastewater discharge control method provided in the embodiment of the present application realizes the automatic discharge control of the wastewater in the wastewater storage tank, thereby reducing the labor cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0050] Figure 1 A schematic diagram of the structure of a wastewater discharge control system for a wastewater storage tank provided in an embodiment of the present application;

[0051] Figure 2 A schematic flow chart of a wastewater discharge control method for a wastewater storage tank provided in an embodiment of the present application;

[0052] Figure 3 A specific implementation flow chart of S201 in a wastewater discharge control method for a wastewater storage tank provided in an embodiment of the present application;

[0053] Figure 4 A specific implementation flow chart of S206 in a wastewater discharge control method for a wastewater storage tank provided in an embodiment of the present application;

[0054] Figure 5A schematic flow chart of a wastewater discharge control method for a wastewater storage tank provided in another aspect of the present application;

[0055] Figure 6 A schematic diagram of the structure of a wastewater discharge control device for a wastewater storage tank provided in an embodiment of the present application;

[0056] Figure 7 A schematic structural diagram of a wastewater discharge control device for a wastewater storage tank provided in another embodiment of the present application. DETAILED DESCRIPTION

[0057] It should be noted that the terms used in the embodiments of the present application are only used to explain the specific embodiments of the present application, and are not intended to limit the present application. In the description of the embodiments of the present application, unless otherwise specified, "multiple" refers to two or more than two, and "at least one", "one or more" refers to one, two or more. The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, it is defined that the "first" and "second" features can explicitly or implicitly include one or more of the features.

[0058] References to "one embodiment" or "some embodiments" etc. described in this specification mean that a particular feature, structure or characteristic described in conjunction with the embodiment is included in one or more embodiments of the present application. Thus, the phrases "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear at different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0059] Liquid carbon dioxide (CO 2 The production process of ) includes compression process, separation process, purification process and condensation purification process, etc. The purified CO 2 After cryogenic treatment, it will be sent to the wastewater storage tank for storage. 2 The separation and purification processes in the production process will produce industrial wastewater. If these industrial wastewaters are not properly treated, they will cause serious harm to people's lives.

[0060] In order to 2 To properly treat the industrial wastewater generated during the production process, avoid wasting resources by repeatedly building wastewater treatment equipment, improve the utilization rate of existing wastewater treatment equipment, and reduce the vacancy rate of existing wastewater treatment equipment, liquid CO2 The wastewater generated during the production process is collected in the wastewater storage tank in the factory area. When the wastewater storage tank is almost full, the wastewater in the wastewater storage tank is transported to the existing wastewater treatment device through the wastewater transmission pipeline for centralized treatment.

[0061] However, the prior art usually requires manual inspection of the liquid level of the wastewater storage tank, and manually opening the drainage pump when the wastewater storage tank is almost full to transport the wastewater to the wastewater treatment device. This is not only cumbersome to operate and has high labor costs; it is also easy for the wastewater to overflow due to untimely transportation, causing environmental pollution.

[0062] In view of this, in order to realize the automatic discharge control of wastewater in the wastewater storage tank, reduce the wastewater overflow phenomenon, and reduce labor costs, the embodiment of the present application provides a wastewater discharge control method, device and system for the wastewater storage tank. By obtaining the current liquid level value of the wastewater storage tank and the current flow value of each water inlet when all the drainage pumps in the wastewater storage tank are closed, and determining the current existence state of the wastewater in the wastewater storage tank; according to the current liquid level value and the current flow value of each water inlet, determining the first time required for the wastewater storage tank to rise from the current liquid level value to the preset safety liquid level value; when the current existence state is not a uniformly mixed state, predicting the second time required to stir the wastewater to a uniformly mixed state; when the second time is less than or equal to the first time, determining the first opening time of the wastewater stirring device according to the current time, the first time and the second time, and determining the second opening time of the drainage pump according to the current time and the first time. By controlling the stirring device to start stirring the wastewater at the first opening moment, the wastewater can be in a uniformly mixed state when it is discharged, which can improve the wastewater discharge efficiency, avoid the outlet pipe from being blocked, and improve the stability of the entire wastewater discharge control system. By turning on the target drainage pump at the second moment, the wastewater can be transported to the target wastewater treatment device through the target outlet pipe before the current liquid level value of the wastewater storage tank exceeds the safe liquid level value, thereby reducing the wastewater overflow phenomenon and reducing the pollution of wastewater to the environment. It can be seen that the wastewater discharge control method provided in the embodiment of the present application realizes the automated discharge control of the wastewater in the wastewater pool, thereby reducing labor costs.

[0063] See also Figure 1 , is a schematic diagram of the structure of a wastewater discharge control system for a wastewater storage tank provided in an embodiment of the present application. Figure 1 As shown, the wastewater storage tank may include n water inlets and m water outlets, where n and m are both positive integers. The n water inlets may be connected to different wastewater generating devices through water inlet pipes. The different wastewater generating devices may be liquid CO 2Wastewater generating devices in different production processes (such as separation process and purification process, etc.) during the production process. The m outlets can be connected to different wastewater treatment devices through outlet pipes. Different wastewater treatment devices can be wastewater treatment devices built in different factory areas, that is, the distance between the wastewater storage tank and each different wastewater treatment device can be different.

[0064] like Figure 1 As shown, the wastewater discharge control system of the wastewater storage tank may include: a liquid level meter 11, n flow meters 12, m drainage pumps 13, multiple turbidity sensors 14, wastewater mixing equipment 15, and a wastewater discharge control device 16. Among them, a communication connection is established between the wastewater discharge control device 16 and the n flow meters 12, the m drainage pumps 14, the multiple turbidity sensors 14, and the wastewater mixing equipment 15. The communication connection may be, for example, a wireless communication connection.

[0065] In some embodiments, the wastewater discharge control device 16 may specifically be an electronic device, such as a mobile phone, a tablet computer, or a laptop computer.

[0066] In other embodiments, the wastewater discharge control device 16 may specifically be a control module, which may be, for example, a field-programmable gate array (FPGA), a programmable automation controller (PAC), or a programmable logic controller (PLC).

[0067] The liquid level meter 11 is installed at a corresponding position inside the wastewater storage tank according to its type. For example, when the liquid level meter 11 is a static pressure liquid level meter, the liquid level meter 11 can be installed at the bottom of the wastewater storage tank. When the liquid level meter 11 is a magnetic flap liquid level meter, the liquid level meter 11 can be installed on the inner wall of the wastewater storage tank. The embodiment of the present application does not specifically limit the type and installation position of the liquid level meter 11.

[0068] The n flow meters 12 can be installed at n different water inlets of the wastewater storage tank, respectively. The flow meter 12 can be used to collect the flow value of the water inlet where it is located, and the flow value can be used to indicate the flow size of the wastewater entering the wastewater storage tank from the water inlet.

[0069] The m drainage pumps 13 can be installed at m different water outlets of the wastewater storage tank, respectively. The drainage pump 13 can be used to start conveying the wastewater in the wastewater storage tank to the corresponding target wastewater treatment device through the outlet pipe connected to the water outlet where the drainage pump 13 is located when receiving the opening instruction from the wastewater discharge control device 16. The drainage pump 13 can also be used to stop conveying the wastewater in the wastewater storage tank to the corresponding target wastewater treatment device when receiving the closing instruction from the wastewater discharge control device 16.

[0070] A plurality of turbidity sensors 14 can be installed at a plurality of different depth points on the inner wall of the wastewater storage tank. Different depth points are used to describe different locations on the inner wall at different distances from the bottom. For example, the distance between each two adjacent depth points can be equal, that is, the plurality of depth points can be equally spaced depth points.

[0071] The wastewater mixing device 15 can be installed in the wastewater storage tank, for example, it can be installed at the bottom or side wall of the wastewater storage tank. Exemplarily, the wastewater mixing device 15 can be a submersible mixer or a paddle mixer, etc. The specific type of the wastewater mixing device 15 is not particularly limited in the embodiment of the present application.

[0072] The wastewater discharge control device 16 can be used to automatically control the discharge of wastewater in the wastewater storage tank according to the liquid level value of the wastewater storage tank collected by the liquid level meter 11, the flow values ​​of each water inlet collected by the n flow meters 12, and the turbidity value collected by the turbidity sensor 14. The specific working principle of the wastewater discharge control device 16 can be referred to the description in the subsequent method embodiment, which will not be described in detail here.

[0073] See also Figure 2 , is a schematic flow chart of a wastewater discharge control method for a wastewater storage tank provided in an embodiment of the present application. The execution subject of the wastewater discharge control method can be Figure 1 Wastewater discharge control device 16. Figure 2 As shown, the wastewater discharge control method may include S201 to S206, which are described in detail as follows:

[0074] S201, when all drainage pumps of the wastewater storage tank are turned off, obtain the current liquid level value of the wastewater storage tank and the current flow value of each water inlet, and determine the current existence status of the wastewater in the wastewater storage tank.

[0075] It is understandable that due to the 2During the production process, wastewater is constantly entering the water inlet of the wastewater storage tank. Therefore, when all the drainage pumps of the wastewater storage tank are turned off, the liquid level of the wastewater storage tank will become higher and higher. In this case, in order to avoid wastewater overflow, the liquid level of the wastewater storage tank needs to be monitored in real time. Specifically, when all the drainage pumps of the wastewater storage tank are turned off, the wastewater discharge control device 16 can obtain the current liquid level value of the wastewater storage tank from the liquid level meter 11 in real time, and obtain the current flow value of each water inlet from each flow meter 12 in real time, so as to determine the start time of wastewater discharge according to the current liquid level value and the current flow value of each water inlet.

[0076] It is understandable that as the amount of wastewater in the wastewater storage tank gradually increases, the wastewater may be stratified. When the wastewater is stratified, the viscosity at the bottom is higher. In this case, if the wastewater is discharged directly, the discharge efficiency of the wastewater will be reduced, and in severe cases, it will cause blockage of the outlet pipe. Therefore, in addition to monitoring the liquid level of the wastewater storage tank, it is also necessary to determine the current status of the wastewater in the wastewater storage tank in real time.

[0077] Exemplarily, the existence state of wastewater may include a stratified state, a partially stratified state, and a uniformly mixed state. Among them, the stratified state may refer to a state in which wastewater is divided into multiple obvious layers in a wastewater storage tank, and there are significant turbidity differences between different layers. The uniformly mixed state may refer to a state in which wastewater maintains a relatively uniform mixing state in a wastewater storage tank, and there is no obvious difference in the turbidity of wastewater at various depth points. The partially stratified state may refer to a state in which wastewater has a certain degree of stratification, there is a significant difference between the turbidity of wastewater at some depth points, and there is no obvious difference in the turbidity of wastewater at some depth points. Among them, the turbidity of wastewater can be as high as the turbidity degree of wastewater, which can be detected by a turbidity sensor.

[0078] In a specific implementation, the wastewater discharge control device can be Figure 3 S2011 to S2015 shown in the figure are used to determine the current state of wastewater in the wastewater storage tank, as detailed below:

[0079] S2011, obtaining the current turbidity value of the wastewater collected by each turbidity sensor.

[0080] The wastewater discharge control device 16 may obtain the current turbidity value of the wastewater collected by each turbidity sensor 14 from each turbidity sensor 14 .

[0081] S2012, calculating a first turbidity difference between the maximum current turbidity value and the minimum current turbidity value, calculating a second turbidity difference between the current turbidity values ​​corresponding to every two adjacent depth points, and calculating a standard deviation of all current turbidity values.

[0082] Exemplarily, assuming that s turbidity sensors 14 are installed on the inner wall of the wastewater storage tank, s-1 second turbidity difference values ​​can be obtained, where s is an integer greater than 1.

[0083] S2013: When the first turbidity difference is greater than the first turbidity threshold and at least one second turbidity difference is greater than the second turbidity threshold, determine that the current state of the wastewater is a stratified state.

[0084] The second turbidity threshold is used to describe the minimum turbidity difference value at which wastewater can be stratified, and the first turbidity threshold is greater than the second turbidity threshold.

[0085] It can be understood that when the first turbidity difference is greater than the first turbidity threshold and at least one second turbidity difference is greater than the second turbidity threshold, it means that there is at least one obvious stratification in the wastewater. In this case, the wastewater discharge control device 16 can determine that the current state of the wastewater is a stratified state.

[0086] S2014: When the first turbidity difference is less than the third turbidity threshold and the standard deviation is less than the first standard deviation threshold, determine that the current state of the wastewater is a uniformly mixed state.

[0087] The third turbidity threshold is used to describe the maximum turbidity difference between different depth points when the wastewater is in a uniformly mixed state, and the first standard deviation threshold is used to describe the maximum turbidity standard deviation allowed when the wastewater is in a uniformly mixed state.

[0088] It can be understood that when the first turbidity difference is less than the third turbidity threshold and the standard deviation is less than the first standard deviation threshold, it means that the difference between the turbidity values ​​of the wastewater at each depth point is small. In this case, the wastewater discharge control device 16 can determine that the current existence state of the wastewater is a uniformly mixed state.

[0089] S2015: When the first turbidity difference is greater than or equal to the third turbidity threshold and less than or equal to the first turbidity threshold, and the standard deviation is greater than the first standard deviation threshold, determine that the current state of the wastewater is a partial stratification state.

[0090] It can be understood that when the first turbidity difference is greater than or equal to the third turbidity threshold and less than or equal to the first turbidity threshold, and the standard deviation is greater than the first standard deviation threshold, it means that the wastewater is stratified, but the turbidity difference between different layers is not very large. In this case, the wastewater discharge control device 16 can determine that the current state of the wastewater is a partially stratified state.

[0091] It should be noted that the above S2013, S2014 and S2015 are mutually exclusive steps, that is, the wastewater discharge control device 16 does not execute S2014 and S2015 when executing S2013, does not execute S2013 and S2015 when executing S2014, and does not execute S2013 and S2014 when executing S2015.

[0092] S202, determining a first time required for the wastewater storage tank to rise from the current liquid level value to a preset safety liquid level value according to the current liquid level value and the current flow value of each water inlet.

[0093] The preset safety liquid level value is less than the depth of the wastewater storage tank, that is, the preset safety liquid level value is less than the maximum liquid level value of the wastewater storage tank. The difference between the preset safety liquid level value and the maximum liquid level value of the wastewater storage tank can be set according to actual conditions, and the embodiment of the present application does not specifically limit it.

[0094] In a specific implementation, S202 may include the following steps:

[0095] According to the current liquid level value and the current flow value of each water inlet, the first time required for the wastewater storage tank to rise from the current liquid level value to the preset safe liquid level value is determined by the following formula (1):

[0096]

[0097] Where, ΔT 1 is the first duration, A is the cross-sectional area of ​​the wastewater storage tank, H safe is the preset safety level value, H now is the current liquid level value, Qin j is the water inlet flow value of the j-th water inlet, n is the number of water inlets of the wastewater storage tank, 1≤j≤n, and j is an integer.

[0098] S203: When the current state of the wastewater is not a uniformly mixed state, predict a second time period required to stir the wastewater to a uniformly mixed state.

[0099] It is understandable that when the current state of the wastewater is not a uniformly mixed state, the wastewater cannot be discharged directly. The wastewater needs to be stirred to a uniformly mixed state before it can be discharged. This can avoid blockage of the outlet pipe of the wastewater storage tank and improve the stability of wastewater discharge control.

[0100] In a specific implementation, S203 may include steps a1 to a2, which are described in detail as follows:

[0101] Step a1, calculate the average value of all current turbidity values.

[0102] Step a2, predicting the second duration by the following formula (2) based on the first turbidity difference, the average value of all current turbidity values, the impeller diameter of the wastewater mixing device, and the rotation speed of the wastewater mixing device:

[0103]

[0104] Where, ΔT 2 is the second time length, k is the preset adjustment coefficient, D is the impeller diameter of the wastewater mixing equipment, Δtrub is the first turbidity difference, N is the speed of the wastewater mixing equipment, trub avg is the average value of all current turbidity values. The value of k can be obtained based on multiple experiments.

[0105] For example, when the wastewater in the wastewater storage tank is in a stratified state or a partially stratified state, and the impeller diameter of the wastewater stirring device, the rotation speed of the wastewater stirring device, the first turbidity difference of the wastewater, and the average value of all current turbidity values ​​are all known, the second time required to stir the wastewater to a uniformly mixed state is recorded, and the second time and the impeller diameter of the wastewater stirring device, the rotation speed of the wastewater stirring device, the first turbidity difference of the wastewater, and the average value of all current turbidity values ​​are introduced into the above formula (2) to obtain the value of k. In practical applications, multiple sets of similar experiments can be used to obtain multiple values ​​of k, and the average value of multiple values ​​of k can be used to determine the value of k in the above formula (2).

[0106] S204, when the second time length is less than or equal to the first time length, determine the first start time of the wastewater mixing device according to the current time, the first time length and the second time length, and determine the second start time of the drainage pump according to the current time and the first time length.

[0107] It can be understood that when the second time duration is less than the first time duration, it means that before the current liquid level value of the wastewater storage tank rises to the preset safety liquid level value, there is enough time to stir the wastewater to a uniformly mixed state, and there is no need to immediately start the wastewater stirring device. In this case, the wastewater discharge control device 16 can determine the first start time of the wastewater stirring device according to the current time, the first time duration and the second time duration; and determine the second start time of the drainage pump according to the current time and the first time duration.

[0108] The first opening time is earlier than the second opening time.

[0109] Specifically, the wastewater discharge control device can determine the first opening time by the following formula (3):

[0110] Ts 1 =T now +(ΔT 1 -ΔT 2 ); formula (3)

[0111] Among them, Ts 1 is the first opening time, T now is the current moment, ΔT 1 is the first duration, ΔT 2 For the second duration.

[0112] Specifically, the wastewater discharge control device 16 can determine the first opening time by the following formula (4):

[0113] Ts 2 =T now +ΔT 1 ;Formula (4)

[0114] Among them, Ts 2 This is the second opening moment.

[0115] S205, controlling the wastewater stirring device to start stirring the wastewater at the first start time.

[0116] By controlling the stirring equipment to start stirring the wastewater at the first start time, the wastewater can be in a uniformly mixed state when being discharged, which can improve the wastewater discharge efficiency, avoid blockage of the outlet pipe, and improve the stability of the entire wastewater discharge control system.

[0117] S206, starting the target drainage pump at the second start time to transport the wastewater to the target wastewater treatment device through the target water outlet pipe.

[0118] By starting the target drainage pump at the second moment, wastewater can be transported to the target wastewater treatment device through the target outlet pipe before the current liquid level value of the wastewater storage tank exceeds the safe liquid level value, thereby reducing wastewater overflow and reducing wastewater pollution to the environment.

[0119] It is understandable that as the amount of wastewater transported by the outlet pipe increases, scale will be attached to the pipe wall of the outlet pipe. As the amount of scale attached increases, the wastewater transport efficiency (i.e., water transport efficiency) of the outlet pipe will gradually decrease, and the length of the outlet pipe will also affect its water transport efficiency. Based on this, in order to efficiently transport wastewater to the wastewater treatment device while reducing the cost of wastewater treatment, in a specific implementation, S206 may include the following: Figure 4 S2061 to S2063 shown are described in detail as follows:

[0120] S2061, for each outlet pipe corresponding to the drainage pump, determine the water delivery efficiency of each outlet pipe according to the historical total water delivery volume, pipe radius and pipe length of the outlet pipe.

[0121] Specifically, the wastewater discharge control device 16 can determine the water delivery efficiency of each outlet pipe through step b1, as described in detail as follows:

[0122] Step b1, according to the historical total water delivery volume, pipeline radius and pipeline length of the water outlet pipeline, the water delivery efficiency of each water outlet pipeline is determined by the following formula (5):

[0123]

[0124] Among them, E i is the water delivery efficiency of the i-th outlet pipe, m is the number of outlet pipes, R i is the pipe radius of the i-th outlet pipe, V i is the total historical water delivery of the ith outlet pipe, L i is the length of the i-th outlet pipe, w 1 、w 2 and w 3 are the weights of pipeline radius, historical total water delivery and pipeline length, w 1 、w 2 and w 3 The sum of is 1. 1 、w 2 and w 3 The value of can be set according to actual needs and is not particularly limited here.

[0125] S2062, determining the water outlet pipeline with the highest water delivery efficiency as the target water outlet pipeline.

[0126] S2063, starting the target drainage pump corresponding to the target water outlet pipe at the second start time.

[0127] See also Figure 5 , is a schematic flow chart of a wastewater discharge control method for a wastewater storage tank provided in another embodiment of the present application. Figure 5 As shown, in some other embodiments, the wastewater discharge control method may further include S207 to S208, which are described in detail as follows:

[0128] S207, when the second time period is longer than the first time period, control the wastewater stirring device to start stirring the wastewater.

[0129] It can be understood that when the second time period is longer than the first time period, it means that there is insufficient time to stir the wastewater to a uniformly mixed state before the current liquid level value of the wastewater storage tank rises to the safe liquid level value. Therefore, in order to prevent the wastewater from having obvious stratification when it is discharged as much as possible, the wastewater discharge control device 16 can immediately control the wastewater stirring equipment 15 to start stirring the wastewater.

[0130] S208, during the mixing process of the wastewater, if the current liquid level value rises to a preset safe liquid level value, all drainage pumps are turned on to transport the wastewater to various wastewater treatment devices through all outlet pipes.

[0131] During the stirring process of the wastewater, the wastewater discharge control device 16 can obtain the current liquid level value of the wastewater storage tank from the liquid level meter 11 in real time. When the current liquid level value of the wastewater storage tank rises to the preset safety liquid level, all drainage pumps are turned on to transport the wastewater to each wastewater treatment device through all outlet pipes with maximum efficiency, thereby minimizing the overflow of wastewater.

[0132] In some further embodiments, the wastewater discharge control method may further include:

[0133] The real-time liquid level value of the wastewater storage tank during the wastewater discharge process is obtained, and when the real-time liquid level value is less than the second preset liquid level value, all drainage pumps are turned off to stop water delivery. The second preset liquid level value can be a lower liquid level value, for example, the second preset liquid level value can be less than 50% of the maximum liquid level value of the wastewater storage tank, which can be set according to actual needs and is not particularly limited here.

[0134] It is understandable that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0135] Based on the wastewater treatment control method provided in the above embodiment, the present application further provides an embodiment of the exhaust gas venting control device to implement the above method embodiment. Figure 6 , is a schematic diagram of the structure of an exhaust gas venting control device provided in an embodiment of the present application. For ease of description, only the parts related to this embodiment are shown. Figure 6 As shown, the exhaust gas discharge control device may include a first determination unit 601 , a second determination unit 602 , a prediction unit 603 , a third determination unit 604 , a first control unit 605 and a second control unit 606 .

[0136] Among them, the first determination unit 601 is used to obtain the current liquid level value of the wastewater storage tank and the current flow value of each water inlet when all the drainage pumps of the wastewater storage tank are turned off, and determine the current existence state of the wastewater in the wastewater storage tank; the existence state of the wastewater includes a stratified state, a partially stratified state and a uniformly mixed state.

[0137] The second determination unit 602 is used to determine the first time required for the wastewater storage tank to rise from the current liquid level value to a preset safety liquid level value based on the current liquid level value and the current flow value of each water inlet; the preset safety liquid level value is less than the depth of the wastewater storage tank.

[0138] The prediction unit 603 is used to predict a second time period required to stir the wastewater to the uniformly mixed state when the current existing state is not the uniformly mixed state.

[0139] The third determination unit 604 determines the first start time of the wastewater mixing device according to the current time, the first time and the second time when the second time is less than or equal to the first time, and determines the second start time of the drainage pump according to the current time and the first time; the first start time is earlier than the second start time.

[0140] The first control unit 605 is used to control the wastewater stirring device to start stirring the wastewater at the first start time.

[0141] The second control unit 606 is used to start the target drainage pump at the second start-up time to transport the wastewater to the target wastewater treatment device through the target outlet pipe.

[0142] Optionally, the exhaust venting control device may further include a third control unit and a fourth control unit.

[0143] The third control unit is used for controlling the wastewater stirring device to start stirring the wastewater when the second time length is greater than the first time length.

[0144] The fourth control unit is used to start all the drainage pumps to transport the wastewater to each wastewater treatment device through each outlet pipe if the current liquid level value rises to the preset safety liquid level value during the stirring process of the wastewater.

[0145] Optionally, turbidity sensors are installed at multiple different depth points of the inner wall of the wastewater storage tank; correspondingly, the first determination unit 601 is specifically used for:

[0146] Acquiring the current turbidity value of the wastewater collected by each of the turbidity sensors;

[0147] Calculating a first turbidity difference between the maximum current turbidity value and the minimum current turbidity value, calculating a second turbidity difference between the current turbidity values ​​corresponding to each two adjacent depth points, and calculating a standard deviation of all the current turbidity values;

[0148] In the case where the first turbidity difference is greater than a first turbidity threshold, and at least one of the second turbidity difference is greater than a second turbidity threshold, determining that the current existing state is the stratified state; the second turbidity threshold is used to describe the minimum turbidity difference value at which the wastewater can produce stratification, and the first turbidity threshold is greater than the second turbidity threshold;

[0149] When the first turbidity difference is less than the third turbidity threshold, and the standard deviation is less than the first standard deviation threshold, the current existing state is determined to be the uniform mixing state; the third turbidity threshold is used to describe the maximum turbidity difference value between different depth points when the wastewater is in the uniform mixing state, and the first standard deviation threshold is used to describe the maximum turbidity standard deviation allowed when the wastewater is in the uniform mixing state;

[0150] When the first turbidity difference is greater than or equal to the third turbidity threshold and less than or equal to the first turbidity threshold, and the standard deviation is greater than the first standard deviation threshold, it is determined that the current existing state is the partial stratification state.

[0151] Optionally, the prediction unit 603 is specifically configured to:

[0152] Calculating an average of all said current turbidity values;

[0153] The second duration is predicted by the following formula according to the first turbidity difference, the average value, the impeller diameter of the wastewater mixing device, and the rotation speed of the wastewater mixing device:

[0154]

[0155] Where, ΔT 2 is the second time length, k is the preset adjustment coefficient, D is the impeller diameter, Δtrub is the first turbidity difference, N is the rotation speed, trub avg is the average value.

[0156] Optionally, the second control unit 606 is specifically configured to:

[0157] For each outlet pipe corresponding to the drainage pump, determine the water delivery efficiency of each outlet pipe according to the historical total water delivery volume, pipe radius and pipe length of the outlet pipe;

[0158] Determine the water outlet pipeline with the highest water delivery efficiency as the target water outlet pipeline;

[0159] The target drainage pump corresponding to the target water outlet pipe is turned on at the second turn-on time.

[0160] Optionally, the second control unit 606 is further configured to:

[0161] According to the total historical water delivery volume, the pipeline radius and the pipeline length, the water delivery efficiency of each of the outlet pipelines is determined by the following formula:

[0162]

[0163] Among them, E i is the water delivery efficiency of the ith outlet pipe, m is the number of outlet pipes, R i is the pipe radius of the i-th outlet pipe, V i is the total historical water delivery of the ith outlet pipeline, L i is the length of the i-th outlet pipe, w 1 、w 2 and w 3 are the weights of the pipeline radius, the historical total water delivery volume and the pipeline length, respectively, 1 、w 2 and w 3 The sum of is 1.

[0164] Optionally, the second determining unit 602 is specifically configured to:

[0165] According to the current liquid level value and the current flow value of each water inlet, the first time required for the wastewater storage tank to rise from the current liquid level value to the preset safety liquid level value is determined by the following formula:

[0166]

[0167] Where, ΔT 1 is the first time length, A is the cross-sectional area of ​​the wastewater storage tank, H safe is the preset safety liquid level value, H now is the current liquid level value, Qin j is the water inlet flow value of the j-th water inlet, and n is the number of water inlets of the wastewater storage tank.

[0168] It should be noted that the information interaction, execution process and other contents between the above-mentioned units are based on the same concept as the method embodiment of the present application. Their specific functions and technical effects can be specifically referred to the method embodiment part and will not be repeated here.

[0169] Those skilled in the art can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units is used as an example for illustration. In actual applications, the above-mentioned functions can be assigned to different functional units as needed, that is, the internal structure of the control device can be divided into different functional units to complete all or part of the functions described above. The functional units in the embodiment can be integrated into a processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of each unit in the above-mentioned control device can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0170] See also Figure 7 , Figure 7 This is a schematic diagram of the structure of an exhaust gas venting control device provided in another embodiment of the present application. Figure 7 As shown, the wastewater discharge control device 7 provided in this embodiment may include: a processor 70, a memory 71, and a computer program 72 stored in the memory 71 and executable on the processor 70, such as a program corresponding to the wastewater treatment control method. When the processor 70 executes the computer program 72, each step in the above wastewater treatment control method embodiment is implemented, such as Figure 2 Alternatively, when the processor 70 executes the computer program 72, the functions of each module / unit in the above-mentioned exhaust gas venting control device embodiment are realized, for example Figure 6 The functions of units 601 to 606 are shown.

[0171] Exemplarily, the computer program 72 may be divided into one or more modules / units, one or more modules / units are stored in the memory 71 and executed by the processor 70 to complete the present application. One or more modules / units may be a series of computer program instruction segments that can complete specific functions, and the instruction segments are used to describe the execution process of the computer program 72 in the wastewater discharge control device 7. For example, the computer program 72 may be divided into a first determination unit, a second determination unit, a prediction unit, a third determination unit, a first control unit, and a second control unit. For the specific functions of each unit, please refer to Figure 7 The relevant descriptions in the corresponding embodiments are not repeated here.

[0172] Those skilled in the art will understand that Figure 7 This is merely an example of the wastewater discharge control device 7 and does not constitute a limitation of the wastewater discharge control device 7, which may include more or less components than shown in the figure, or a combination of certain components, or different components.

[0173] The processor 70 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor, etc.

[0174] The memory 71 may be an internal storage unit of the wastewater discharge control device 7, such as a hard disk or memory of the wastewater discharge control device 7. The memory 71 may also be an external storage device of the wastewater discharge control device 7, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, or a flash card, etc., equipped on the wastewater discharge control device 7. Further, the memory 71 may also include both an internal storage unit and an external storage device of the wastewater discharge control device 7. The memory 71 is used to store computer programs and other programs and data required by the method. The memory 71 may also be used to temporarily store data that has been output or is to be output.

[0175] An embodiment of the present application also provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, each step of the wastewater discharge control method described in the above method embodiment is implemented.

[0176] An embodiment of the present application provides a computer program product. When the computer program product runs on a control device, the control device implements the steps in the above-mentioned various method embodiments.

[0177] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0178] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0179] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A method for controlling wastewater discharge from a wastewater storage tank, characterized in that: include: When all drainage pumps of the wastewater storage tank are turned off, the current liquid level value of the wastewater storage tank and the current flow value of each water inlet are obtained, and the current existence state of the wastewater in the wastewater storage tank is determined; the existence state of the wastewater includes a stratified state, a partially stratified state and a uniformly mixed state; Determine, according to the current liquid level value and the current flow value of each of the water inlets, a first time required for the wastewater storage tank to rise from the current liquid level value to a preset safety liquid level value; The preset safety liquid level value is less than the depth of the wastewater storage tank; When the current existing state is not the uniformly mixed state, predicting a second time period required to stir the wastewater to the uniformly mixed state; When the second time duration is less than or equal to the first time duration, a first start time of the wastewater mixing device is determined according to the current time, the first time duration and the second time duration, and a second start time of the drainage pump is determined according to the current time and the first time duration; the first start time is earlier than the second start time; Controlling the wastewater stirring device to start stirring the wastewater at the first start time; The target drainage pump is turned on at the second start time to transport the wastewater to the target wastewater treatment device through the target water outlet pipe.

2. The wastewater discharge control method according to claim 1, characterized in that: Also includes: When the second time period is greater than the first time period, controlling the wastewater stirring device to start stirring the wastewater; During the stirring process of the wastewater, if the current liquid level value rises to the preset safe liquid level value, all the drainage pumps are turned on to transport the wastewater to each wastewater treatment device through each outlet pipe.

3. The wastewater discharge control method according to claim 1, characterized in that: Turbidity sensors are installed at multiple different depth points on the inner wall of the wastewater storage tank; correspondingly, determining the current state of wastewater in the wastewater storage tank includes: Acquiring the current turbidity value of the wastewater collected by each of the turbidity sensors; Calculating a first turbidity difference between the maximum current turbidity value and the minimum current turbidity value, calculating a second turbidity difference between the current turbidity values ​​corresponding to each two adjacent depth points, and calculating a standard deviation of all the current turbidity values; In the case where the first turbidity difference is greater than a first turbidity threshold, and at least one of the second turbidity difference is greater than a second turbidity threshold, determining that the current existing state is the stratified state; the second turbidity threshold is used to describe the minimum turbidity difference value at which the wastewater can produce stratification, and the first turbidity threshold is greater than the second turbidity threshold; When the first turbidity difference is less than the third turbidity threshold, and the standard deviation is less than the first standard deviation threshold, the current existing state is determined to be the uniform mixing state; the third turbidity threshold is used to describe the maximum turbidity difference value between different depth points when the wastewater is in the uniform mixing state, and the first standard deviation threshold is used to describe the maximum turbidity standard deviation allowed when the wastewater is in the uniform mixing state; When the first turbidity difference is greater than or equal to the third turbidity threshold and less than or equal to the first turbidity threshold, and the standard deviation is greater than the first standard deviation threshold, it is determined that the current existing state is the partial stratification state.

4. The wastewater discharge control method according to claim 3, characterized in that: In a case where the current existing state is not the uniformly mixed state, predicting a second time required to stir the wastewater to the uniformly mixed state comprises: Calculating an average of all said current turbidity values; The second duration is predicted by the following formula according to the first turbidity difference, the average value, the impeller diameter of the wastewater mixing device, and the rotation speed of the wastewater mixing device: Wherein, ΔT2 is the second time length, k is the preset adjustment coefficient, D is the impeller diameter, Δtrub is the first turbidity difference, N is the rotation speed, trub avg is the average value.

5. The wastewater discharge control method according to claim 1, characterized in that: The target drainage pump is started at the second start time to transport the wastewater to the target wastewater treatment device through the target outlet pipe, including: For each outlet pipe corresponding to the drainage pump, determine the water delivery efficiency of each outlet pipe according to the historical total water delivery volume, pipe radius and pipe length of the outlet pipe; Determine the water outlet pipeline with the highest water delivery efficiency as the target water outlet pipeline; The target drainage pump corresponding to the target water outlet pipe is turned on at the second turn-on time.

6. The wastewater discharge control method according to claim 5, characterized in that: Determining the water delivery efficiency of each of the water outlet pipelines according to the historical total water delivery volume, the pipeline radius, and the pipeline length of the water outlet pipelines includes: According to the total historical water delivery volume, the pipeline radius and the pipeline length, the water delivery efficiency of each of the outlet pipelines is determined by the following formula: Among them, E i is the water delivery efficiency of the ith outlet pipe, m is the number of outlet pipes, R i is the pipe radius of the ith outlet pipe, V i is the total historical water delivery of the ith outlet pipeline, L i is the length of the i-th water outlet pipe, w1, w2 and w3 are the weights of the pipe radius, the historical total water delivery and the pipe length respectively, and the sum of w1, w2 and w3 is 1.

7. The method for controlling wastewater discharge according to any one of claims 1 to 6, characterized in that: Determining a first time required for the wastewater storage tank to rise from the current liquid level value to a preset safety liquid level value according to the current liquid level value and the current flow value of each of the water inlets, comprising: According to the current liquid level value and the current flow value of each water inlet, the first time required for the wastewater storage tank to rise from the current liquid level value to the preset safety liquid level value is determined by the following formula: Wherein, ΔT1 is the first time length, A is the cross-sectional area of ​​the wastewater storage tank, H safe is the preset safety liquid level value, H now is the current liquid level value, Qin j is the water inlet flow value of the j-th water inlet, and n is the number of water inlets of the wastewater storage tank.

8. A wastewater discharge control device for a wastewater storage tank, characterized in that: include: The first determination unit is used to obtain the current liquid level value of the wastewater storage tank and the current flow value of each water inlet when all the drainage pumps of the wastewater storage tank are turned off, and determine the current existence state of the wastewater in the wastewater storage tank; the existence state of the wastewater includes a stratified state, a partially stratified state and a uniformly mixed state; A second determining unit, configured to determine a first time required for the wastewater storage tank to rise from the current liquid level value to a preset safety liquid level value according to the current liquid level value and the current flow value of each of the water inlets; The preset safety liquid level value is less than the depth of the wastewater storage tank; A prediction unit, configured to predict a second time required to stir the wastewater to the uniformly mixed state when the current existing state is not the uniformly mixed state; a third determining unit, when the second time duration is less than or equal to the first time duration, determining a first start time of the wastewater mixing device according to a current time, the first time duration and the second time duration, and determining a second start time of the drainage pump according to the current time and the first time duration; the first start time is earlier than the second start time; a first control unit, configured to control the wastewater stirring device to start stirring the wastewater at the first start time; The second control unit is used to start the target drainage pump at the second start time to transport the wastewater to the target wastewater treatment device through the target water outlet pipe.

9. A wastewater discharge control device for a wastewater storage tank, characterized in that: The method comprises a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the wastewater discharge control method as described in any one of claims 1 to 7 when executing the computer program.

10. A wastewater discharge control system for a wastewater storage tank, characterized in that: The wastewater discharge control device comprises one or more flow meters, a liquid level sensor, a plurality of turbidity sensors, one or more drainage pumps and the wastewater discharge control device as claimed in claim 8 or 9.

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