An automatic dissolved oxygen control method and control system

Abstract

The present application relates to a method and a control system for automatically controlling dissolved oxygen. The control method includes obtaining historical measured data to construct a basic data dictionary, wherein the historical measured data includes influent flow rate, turbidity, measured value of dissolved oxygen, and actual opening degree of the intake valve; obtaining the current set value of dissolved oxygen, the current influent flow rate, and the current turbidity; based on the current set value of dissolved oxygen, the current influent flow rate, and the current turbidity, screening out a single piece of data from the basic data dictionary as reference data; and controlling the current opening degree of the intake valve based on the actual opening degree of the intake valve in the reference data. By realizing screening out a unique piece of data that conforms to the current working conditions (the current set value of dissolved oxygen, the current influent flow rate, and the current turbidity) from the basic data dictionary as reference data, and controlling the current opening degree of the intake valve according to the actual opening degree of the intake valve in the reference data, the control efficiency and accuracy of dissolved oxygen can be improved to meet the requirements of sewage biochemical treatment.

Description

Technical Field

[0001] This application relates to the field of sewage biochemical treatment, and in particular to a method and control system for automatic dissolved oxygen control. Background Art

[0002] Currently, most municipal sewage treatment plants in China use biochemical treatment technology to treat domestic sewage of urban residents.

[0003] Biochemical treatment usually includes two important elements: 1. Aerating a large amount of oxygen in water to support the survival of microorganisms; 2. Using microorganisms to decompose organic matter in sewage, thereby purifying the sewage.

[0004] Generally, data such as the influent flow rate and turbidity of the biological tank inlet change continuously, which requires the dissolved oxygen in the biological tank to be adjusted at any time according to the change of the influent water quality. Summary of the Invention

[0005] In order to improve the control efficiency and accuracy of dissolved oxygen to meet the requirements of sewage biochemical treatment, this application provides a method and control system for automatic dissolved oxygen control.

[0006] In the first aspect, this application provides a method for automatic dissolved oxygen control, adopting the following technical solutions:

[0007] A method for automatic dissolved oxygen control includes obtaining historical measured data to construct a basic data dictionary, where the historical measured data includes influent flow rate, turbidity, measured value of dissolved oxygen, and actual opening degree of the intake valve;

[0008] Obtaining the current set value of dissolved oxygen, the current influent flow rate, and the current turbidity;

[0009] Based on the current set value of dissolved oxygen, the current influent flow rate, and the current turbidity, screening out a single piece of data from the basic data dictionary as reference data;

[0010] Based on the actual opening degree of the intake valve in the reference data, controlling the current opening degree of the intake valve.

[0011] By adopting the above technical solutions, the historical measured data in the basic data dictionary records the actual situations of the influent flow rate, turbidity, measured value of dissolved oxygen, and actual opening degree of the intake valve. Screening out a single piece of data that conforms to the current working conditions (the current set value of dissolved oxygen, the current influent flow rate, and the current turbidity) from the basic data dictionary as reference data, and controlling the current opening degree of the intake valve according to the actual opening degree of the intake valve in the reference data can improve the control efficiency and accuracy of dissolved oxygen to meet the requirements of sewage biochemical treatment.

[0012] Preferably, the step of screening out a single piece of data from the basic data dictionary as the reference data based on the current dissolved oxygen set value, the current influent flow rate, and the current turbidity includes the following steps:

[0013] Based on the current dissolved oxygen set value, screen out a data set from the basic data dictionary and construct a dissolved oxygen reference set;

[0014] When only a single piece of data is included in the dissolved oxygen reference set, use this single piece of data as the reference data;

[0015] When multiple pieces of data are included in the dissolved oxygen reference set, based on the current influent flow rate and the current turbidity, screen out a single piece of data from the dissolved oxygen reference set as the reference data.

[0016] By adopting the above technical solution, the current influent flow rate and the current turbidity are constantly changing, and there may be cases where the current influent flow rate and the current turbidity have no records in the historical measured data. First, conduct a preliminary screening based on the current dissolved oxygen set value to facilitate screening out data that meets the current working conditions for reference.

[0017] Preferably, the step of screening out a data set from the basic data dictionary based on the current dissolved oxygen set value and constructing a dissolved oxygen reference set includes the following steps:

[0018] Based on the current dissolved oxygen set value and the preset dissolved oxygen allowable error value, generate a dissolved oxygen set range;

[0019] Based on the dissolved oxygen set range, screen out a data set from the basic data dictionary and construct a dissolved oxygen reference set.

[0020] By adopting the above technical solution, there may be cases where the current dissolved oxygen set value has no records in the historical measured data. At the same time, the current dissolved oxygen set value is usually the best value that meets the current working conditions and allows for fluctuations up and down. Then, based on the dissolved oxygen set range, screen out data for reference.

[0021] Preferably, the step of screening out a single piece of data from the basic data dictionary as the reference data based on the current dissolved oxygen set value, the current influent flow rate, and the current turbidity includes the following steps:

[0022] Based on the current influent flow rate, screen out a data set from the basic data dictionary and construct an influent reference set;

[0023] When only a single piece of data is included in the influent reference set, use this single piece of data as the reference data;

[0024] When multiple pieces of data are included in the influent reference set, based on the current turbidity, screen out a single piece of data from the influent reference set as the reference data.

[0025] By adopting the above technical solution, the dissolved oxygen is expressed in milligrams of oxygen per liter of water (mg / L). To ensure the dissolved oxygen, the aeration volume is directly related to the influent volume. Screening is carried out based on the current influent flow rate to screen out data that conforms to the current working conditions for reference.

[0026] Preferably, in the step of screening out a data set from the basic data dictionary based on the current influent flow rate and constructing an influent reference set, the following steps are included:

[0027] Based on the current influent flow rate and a preset allowable error value of the influent volume, an influent volume range is generated;

[0028] Based on the influent volume range, a data set is screened out from the basic data dictionary and an influent reference set is constructed.

[0029] By adopting the above technical solution, there may be a situation where the current influent flow rate has no record in the historical measured data. Then, based on the influent volume range, data is screened out for reference.

[0030] Preferably, when the influent reference set contains multiple specific turbidity data, the allowable error value of the influent volume is updated based on a preset influent volume screening coefficient, and the influent volume range and the influent reference set are updated;

[0031] Wherein, the specific turbidity data is data with a turbidity equal to the current turbidity, and the updated influent volume range is smaller than the influent volume range before update.

[0032] By adopting the above technical solution, by continuously narrowing the influent volume range, a unique piece of data that conforms to the current working conditions is screened out as the reference data to ensure the control efficiency and accuracy of the dissolved oxygen.

[0033] Preferably, in the step of screening out a single piece of data from the basic data dictionary as the reference data based on the current dissolved oxygen set value, the current influent flow rate, and the current turbidity, the following steps are included:

[0034] Based on the current turbidity, a data set is screened out from the basic data dictionary and a turbidity reference set is constructed;

[0035] When the turbidity reference set contains only a single piece of data, this single piece of data is used as the reference data.

[0036] By adopting the above technical solution, the turbidity mainly reflects the content of suspended substances and colloids such as organic matter and plankton in the sewage. Organic matter needs to be decomposed by microorganisms, and the dissolved oxygen should support the survival of microorganisms. Then, the aeration volume is indirectly related to the turbidity. Screening is carried out based on the current turbidity to screen out data that conforms to the current working conditions for reference.

[0037] Preferably, in the step of screening out a data set from the basic data dictionary based on the current turbidity and constructing a turbidity reference set, the following steps are included:

[0038] Based on the current turbidity and a preset turbidity allowable error value, a turbidity range is generated;

[0039] Based on the turbidity range, a data set is screened out from the basic data dictionary and a turbidity reference set is constructed.

[0040] By adopting the above technical solution, there may be a situation where the current turbidity is not recorded in the historical measured data. Then, based on the turbidity range, data is screened out for reference.

[0041] Preferably, when the turbidity reference set contains multiple specific water inlet flow data, the turbidity allowable error value is updated based on a preset turbidity screening coefficient, and the turbidity range and the turbidity reference set are updated;

[0042] Among them, the specific water inlet flow data is the data with the inlet water flow equal to the current inlet water flow, and the updated turbidity range is smaller than the previous turbidity range.

[0043] By adopting the above technical solution, by continuously narrowing the turbidity range, a unique piece of data that conforms to the current working condition is screened out as the reference data to ensure the control efficiency and accuracy of dissolved oxygen.

[0044] In a second aspect, the present application provides a dissolved oxygen automatic control system, adopting the following technical solution:

[0045] A dissolved oxygen automatic control system includes a storage device, a human-computer interaction device, a detection device, a control device, and an aeration device;

[0046] Historical measured data is stored in the storage device to construct a basic data dictionary;

[0047] The human-computer interaction device is used to send a preset current dissolved oxygen set value to the control device;

[0048] The detection device is used to detect the inlet water flow and turbidity in real time, and send the current inlet water flow and the current turbidity to the control device;

[0049] The control device screens out a single piece of data from the basic data dictionary as the reference data based on the current dissolved oxygen set value, the current inlet water flow, and the current turbidity;

[0050] The control device controls the current opening degree of the inlet valve of the aeration device based on the actual opening degree of the inlet valve in the reference data.

[0051] By adopting the above technical solution, the historical measured data stored in the storage device records the actual situations of the influent flow rate, turbidity, measured dissolved oxygen value, and the actual opening degree of the intake valve. From these data, a unique piece of data that conforms to the current working conditions (the current dissolved oxygen set value, the current influent flow rate, and the current turbidity) is selected as the reference data. According to the actual opening degree of the intake valve in the reference data, the current opening degree of the intake valve is controlled, which can improve the control efficiency and accuracy of dissolved oxygen to meet the requirements of sewage biochemical treatment.

[0052] In summary, the present application includes at least one of the following beneficial technical effects:

[0053] 1. The historical measured data in the basic data dictionary records the actual situations of the influent flow rate, turbidity, measured dissolved oxygen value, and the actual opening degree of the intake valve. A unique piece of data that conforms to the current working conditions (the current dissolved oxygen set value, the current influent flow rate, and the current turbidity) is selected from the basic data dictionary as the reference data. According to the actual opening degree of the intake valve in the reference data, the current opening degree of the intake valve is controlled, which can improve the control efficiency and accuracy of dissolved oxygen to meet the requirements of sewage biochemical treatment. Description of the Drawings

[0054] Figure 1 is the structural block diagram of the dissolved oxygen automatic control system.

[0055] Figure 2 is the flowchart of the dissolved oxygen automatic control method.

[0056] Figure 3 is the flowchart of steps S310 - S320.

[0057] Figure 4 is the flowchart of steps S330 - S340.

[0058] Figure 5 is the flowchart of steps S350 - S360.

[0059] Figure 6 is the flowchart of steps S371 - S374.

[0060] Figure 7 is the flowchart of steps S375 - S378.

[0061] Figure 8 is the flowchart of steps S610 - S620.

[0062] Description of the Reference Numerals: 1. Storage device; 2. Human - machine interaction device; 3. Detection device; 4. Aeration device; 5. Control device. Detailed Description of the Embodiment

[0063] The following further describes the present application in detail with reference to the Figure 1-8 drawings.

[0064] An embodiment of the present application discloses an automatic dissolved oxygen control system for controlling the dissolved oxygen in a biochemical tank.

[0065] The automatic dissolved oxygen control system includes a storage device 1, a human-computer interaction device 2, a detection device 3, an aeration device 4, and a control device 5. Data interaction can be achieved between the devices through communication methods such as WiFi, Bluetooth, mobile data, WLAN, USB, RS232, RS485, etc.

[0066] The storage device 1 stores historical measured data of the current biochemical tank to construct a basic data dictionary. Among them, the historical measured data includes the influent flow rate, turbidity, measured dissolved oxygen value, and actual opening degree of the intake valve. Specifically, the storage device 1 can adopt a magnetic disk, magnetic tape, optical disc, USB flash drive, etc. Preferably, the storage device 1 adopts a hard disk (Hard Disk Drive).

[0067] The human-computer interaction device 2 is connected to the control device 5. The human-computer interaction device 2 sends a preset current dissolved oxygen set value to the control device 5 based on the operations of the staff. Specifically, the human-computer interaction device 2 can adopt a mobile terminal, PAD, computer, etc.

[0068] The detection device 3 is connected to the control device 5. The detection device 3 is used to detect the influent flow rate and turbidity in real time, and send the current influent flow rate and current turbidity to the control device 5. Specifically, the detection device 3 includes a liquid flow sensor and a turbidimeter. The liquid flow sensor is connected to the control device 5. The liquid flow sensor is used to detect the influent flow rate of the biochemical tank in real time and send the current influent flow rate to the control device 5. The turbidimeter is connected to the control device 5. The turbidimeter is used to detect the turbidity of the sewage in the biochemical tank and send the current turbidity to the control device 5.

[0069] In this embodiment, the detection device 3 further includes a dissolved oxygen sensor. The dissolved oxygen sensor is connected to the control device 5. The dissolved oxygen sensor is used to detect the dissolved oxygen in the biochemical tank and send the current measured dissolved oxygen value to the control device 5.

[0070] The aeration device 4 is used to convey air or oxygen into the biochemical tank. Specifically, the aeration device 4 includes a gas source, a gas pipe, and an intake valve. One end of the gas pipe is connected to the outlet of the gas source, and the other end of the gas pipe extends into the biochemical tank. The intake valve is installed on the gas pipe to control the opening and closing of the gas pipe. Among them, the gas source can adopt a gas cylinder, a blower, etc.; the intake valve is an electric control valve.

[0071] The control device 5 is a device with data storage and processing capabilities, such as: a single-chip microcomputer, a computer, etc.

[0072] The control device 5 selects a single piece of data from the basic data dictionary as the reference data based on the current dissolved oxygen set value, the current influent flow rate, and the current turbidity. Meanwhile, the control device 5 is connected to the intake valve. The control device 5 controls the current opening degree of the intake valve of the aeration device 4 based on the actual opening degree of the intake valve in the reference data.

[0073] Meanwhile, the control device 5 sends the measured value of the current dissolved oxygen, the current influent flow rate, the current turbidity, and the current opening degree of the intake valve to the storage device 1 to update the basic data dictionary. Moreover, the control device 5 sends the measured value of the current dissolved oxygen, the current influent flow rate, the current turbidity, and the current opening degree of the intake valve to the human-machine interaction device 2 for display, and the human-machine interaction device 2 displays the current working condition for the staff to view.

[0074] The following elaborates on the control method in combination with the above-mentioned dissolved oxygen automatic control system.

[0075] The embodiment of the present application also discloses a dissolved oxygen automatic control method, which is mainly applied to a biochemical tank with a long operating time, so that the current biochemical tank has a large amount of historical measured data to meet the usage requirements.

[0076] The dissolved oxygen automatic control method includes the following steps:

[0077] Referring to Figure 2 , S100, obtain historical measured data to construct a basic data dictionary.

[0078] Specifically, the storage device 1 stores the historical measured data of the current biochemical tank to construct a basic data dictionary. Among them, the historical measured data includes the influent flow rate, turbidity, measured value of dissolved oxygen, and actual opening degree of the intake valve.

[0079] S200, obtain the current dissolved oxygen set value, the current influent flow rate, and the current turbidity.

[0080] Specifically, the human-machine interaction device 2 sends a preset current dissolved oxygen set value to the control device 5 based on the operation of the staff. The liquid flow sensor detects the influent flow rate of the biochemical tank in real time and sends the current influent flow rate to the control device 5. The turbidity meter detects the turbidity of the sewage in the biochemical tank and sends the current turbidity to the control device 5.

[0081] S300, based on the current dissolved oxygen set value, the current influent flow rate, and the current turbidity, select a single piece of data from the basic data dictionary as the reference data.

[0082] In step S300, it includes the following steps:

[0083] Referring to Figure 3 , S310, based on the current dissolved oxygen set value, select a data set from the basic data dictionary and construct a dissolved oxygen reference set.

[0084] In step S310, the following steps are included:

[0085] S311, Based on the current dissolved oxygen set value and the preset dissolved oxygen allowable error value, generate a dissolved oxygen set range.

[0086] Specifically, the dissolved oxygen allowable error value can be set by the staff. That is, the human-computer interaction device 2 responds to the operation of the staff to send the dissolved oxygen allowable error value to the control device 5.

[0087] S312, Based on the dissolved oxygen set range, select a data set from the basic data dictionary and construct a dissolved oxygen reference set.

[0088] Specifically, select a data set in which the measured dissolved oxygen value falls within the dissolved oxygen set range from the basic data dictionary, and construct a dissolved oxygen reference set.

[0089] For example: The current dissolved oxygen set value is manually set by the staff to 0.8 mg / L, and the dissolved oxygen allowable error value is manually set by the staff to ±0.2 mg / L. Then the dissolved oxygen set range is 0.6 - 1.0 mg / L. Further, select a data set with a measured dissolved oxygen value of 0.6 - 1.0 mg / L from the basic data dictionary to construct a dissolved oxygen reference set.

[0090] S320, Whether the dissolved oxygen reference set contains multiple pieces of data. If not, execute step S321; if so, execute step S322.

[0091] S321, Use the single piece of data contained in the dissolved oxygen reference set as the reference data.

[0092] S322, Based on the current influent flow rate and the current turbidity, select a single piece of data from the dissolved oxygen reference set as the reference data.

[0093] After step S322, the following steps are further included:

[0094] Refer to Figure 4 , S330, Based on the current influent flow rate, select a data set from the dissolved oxygen reference set and construct an influent reference set.

[0095] In step S330, the following steps are included:

[0096] S331, Based on the current influent flow rate and the preset influent volume allowable error value, generate an influent volume range.

[0097] Specifically, the influent volume allowable error value can be set by the staff. That is, the human-computer interaction device 2 responds to the operation of the staff to send the influent volume allowable error value to the control device 5.

[0098] S332. Screen out the data set from the dissolved oxygen reference set and construct the influent water reference set based on the influent water volume range.

[0099] Specifically, screen out the data set in which the influent water flow falls within the influent water volume range from the dissolved oxygen reference set, and construct the influent water reference set.

[0100] For example: the current influent water flow is 200 m 3 / h, and the allowable error value of the influent water volume is manually set by the staff to be ±20 m 3 / h. Then the influent water volume range is 180 - 220 m 3 / h. Furthermore, screen out the data set with the influent water flow of 180 - 220 m 3 / h from the dissolved oxygen reference set to construct the influent water reference set.

[0101] S340. Whether there are multiple pieces of data in the influent water reference set. If not, execute step S341; if so, execute step S342.

[0102] S341. Use the single piece of data included in the dissolved oxygen reference set as the reference data.

[0103] S342. Based on the current turbidity, screen out a single piece of data from the influent water reference set as the reference data.

[0104] After step S342, the following steps are further included:

[0105] Refer to Figure 5 S350. Based on the current turbidity, screen out the data set from the influent water reference set and construct the turbidity reference set.

[0106] In step S350, the following steps are included:

[0107] S351. Based on the current turbidity and the preset allowable turbidity error value, generate the turbidity range.

[0108] Specifically, the allowable turbidity error value can be set by the staff. That is, the human-computer interaction device 2 responds to the operation of the staff to send the allowable turbidity error value to the control device 5.

[0109] S352. Based on the turbidity range, screen out the data set from the influent water reference set and construct the turbidity reference set.

[0110] Specifically, screen out the data set in which the turbidity falls within the turbidity range from the influent water reference set, and construct the turbidity reference set.

[0111] S360. Whether there are multiple pieces of data in the turbidity reference set. If not, execute step S361; if so, execute step S370.

[0112] S361, use a single piece of data included in the turbidity reference set as the reference data.

[0113] In step S370, the following steps are included:

[0114] Refer to Figure 6 , S371, check whether the turbidity reference set contains specific water inlet flow data; if not, execute step S372; if so, execute step S373.

[0115] Specifically, the specific water inlet flow data is the data in the turbidity reference set where the water inlet flow rate is equal to the current water inlet flow rate.

[0116] For example: if the current water inlet flow rate is 200 m 3 / h, then the specific water inlet flow data is the data in the turbidity reference set where the water inlet flow rate is 200 m 3 / h.

[0117] S372, update the allowable error value of the water inlet flow rate based on a preset water inlet flow rate screening coefficient, and execute steps S330 - S360.

[0118] Specifically, the water inlet flow rate screening coefficient can be set by the staff. That is, the human - machine interaction device 2 responds to the operation of the staff to send the water inlet flow rate screening coefficient to the control device 5. The control device 5 updates the water inlet flow rate range and the water inlet reference set based on the updated allowable error value of the water inlet flow rate.

[0119] For example, the allowable error value of the water inlet flow rate is ±N0 (m 3 / h), and the water inlet flow rate screening coefficient is manually set by the staff to K1, where K1 < 1. Then the updated allowable error value of the water inlet flow rate is ±N1 (m 3 / h), and N1 = N0×(1 - K1), so that the updated water inlet flow rate range is smaller than the water inlet flow rate range before the update.

[0120] S373, check whether the number of specific water inlet flow rate data is 1; if so, execute step S374.

[0121] S374, use the specific water inlet flow rate data as the reference data.

[0122] Refer to Figure 7 , S375, check whether the turbidity reference set contains specific turbidity data; if not, execute step S376; if so, execute step S377.

[0123] Specifically, the specific turbidity data is the data in the turbidity reference set where the turbidity is equal to the current turbidity.

[0124] S376, update the allowable error value of the turbidity based on a preset turbidity screening coefficient, and execute steps S350 - S360.

[0125] Specifically, the turbidity screening coefficient can be set by the staff. That is, the human-machine interaction device 2 responds to the operation of the staff to send the turbidity screening coefficient to the control device 5. The control device 5 updates the turbidity range and the turbidity reference set based on the updated turbidity allowable error value.

[0126] For example, if the turbidity allowable error value is ±M0 (NTU / FNU / FTU), and the water inflow screening coefficient is manually set by the staff to K2, where K2 < 1, then the updated water inflow allowable error value is ±M1 (NTU / FNU / FTU), and M1 = M0×(1 - K2), so that the updated turbidity range is smaller than the turbidity range before the update.

[0127] S377, whether the number of specific turbidity data is 1; if so, execute step S378.

[0128] S378, use the specific turbidity data as the reference data.

[0129] It should be noted that in step S370, the staff can set the priorities of steps S371 and S375 based on the actual situation.

[0130] If the priority of step S371 is set higher than the priority of step S375, then the control device 5 first executes step S371, and at this time, step S373 also includes: if the number of specific water inflow data is not 1, then execute step S375.

[0131] If the priority of step S375 is set higher than the priority of step S371, then the control device 5 first executes step S375, and at this time, step S377 also includes: if the number of specific turbidity data is not 1, then execute step S371.

[0132] Refer to Figure 2 , S400, based on the actual opening degree of the intake valve in the reference data, control the current opening degree of the intake valve.

[0133] The control device 5 screens out a unique piece of data that conforms to the current working conditions (current dissolved oxygen set value, current water inflow, and current turbidity) from the basic data dictionary as the reference data, and controls the current opening degree of the intake valve according to the actual opening degree of the intake valve in the reference data.

[0134] S500, obtain the measured data of the current biochemical pool and update the basic data dictionary.

[0135] Specifically, the dissolved oxygen sensor is used to detect the dissolved oxygen in the biochemical pool and send the measured value of the current dissolved oxygen to the control device 5. The control device 5 sends the measured value of the current dissolved oxygen, the current water inflow, the current turbidity, and the current opening degree of the intake valve to the storage device 1 to update the basic data dictionary.

[0136] Meanwhile, the automatic dissolved oxygen control method further includes:

[0137] Referring to Figure 8 , S610, if in step S300, there is no data in the dissolved oxygen reference set, the influent reference set or the turbidity reference set, data is screened from the basic data dictionary based on the current influent flow rate and the current turbidity, and a set reference set is constructed.

[0138] Specifically, there are the following situations that may result in no data in the dissolved oxygen reference set, the influent reference set or the turbidity reference set:

[0139] 1. Incorrect current dissolved oxygen set value caused by misoperation of the staff;

[0140] 2. The data of the current working condition does not meet the treatment standard of the current biochemical tank.

[0141] Among them, for the second situation, there are the following possible reasons: First, the detection device 3 fails; Second, the previous sewage treatment is unqualified, resulting in the sewage flowing into the current biochemical tank not meeting the treatment standard of the current biochemical tank.

[0142] Meanwhile, when the control device 5 screens data from the basic data dictionary based on the current influent flow rate and the current turbidity and constructs a set reference set, the influent volume allowable error value and the turbidity allowable error value can be combined for screening.

[0143] S620, determine whether there is data in the set reference set; if there is, execute step S621; if not, execute step S622.

[0144] S621, generate a set reference range based on the measured dissolved oxygen value in the set reference set.

[0145] Specifically, the control device 5 performs bubble sorting on the data in the set reference set based on the measured dissolved oxygen value to obtain the maximum and minimum values of the measured dissolved oxygen value in the set reference set, and generates a set reference range. Meanwhile, the control device 5 sends the set reference range to the human-computer interaction device 2 for display for the staff to refer to.

[0146] S622, determine that the data of the current working condition does not meet the treatment standard of the current biochemical tank and issue a prompt.

[0147] Specifically, the control device 5 sends a prompt message to the human-computer interaction device 2 for display to prompt the staff to conduct a fault check.

[0148] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. An automatic dissolved oxygen control method, characterized in that, it includes the following steps: Obtain historical measured data to construct a basic data dictionary, where the historical measured data includes influent flow rate, turbidity, measured dissolved oxygen value, and actual opening degree of the intake valve; Obtain the current dissolved oxygen set value, current influent flow rate, and current turbidity; Based on the current dissolved oxygen set value, current influent flow rate, and current turbidity, select a single piece of data from the basic data dictionary as the reference data; Based on the actual opening degree of the intake valve in the reference data, control the current opening degree of the intake valve; In the step of selecting a single piece of data from the basic data dictionary as the reference data based on the current dissolved oxygen set value, current influent flow rate, and current turbidity, it includes the following steps: Based on the current dissolved oxygen set value, select a data set from the basic data dictionary and construct a dissolved oxygen reference set; Based on the current influent flow rate, select a data set from the basic data dictionary and construct an influent reference set; Based on the current turbidity, select a data set from the basic data dictionary and construct a turbidity reference set; When the current dissolved oxygen set value is incorrect due to misoperation by the staff and / or the data of the current working condition does not meet the treatment standard of the current biochemical tank, there is no data in the dissolved oxygen reference set, influent reference set, or turbidity reference set; When there is no data in the dissolved oxygen reference set, influent reference set, or turbidity reference set, select data from the basic data dictionary based on the current influent flow rate and current turbidity and construct a set reference set, When there is data in the set reference set, generate a set reference range based on the measured dissolved oxygen value in the set reference set, When there is no data in the set reference set, determine that the data of the current working condition does not meet the treatment standard of the current biochemical tank and issue a prompt.

2. The automatic dissolved oxygen control method according to claim 1, characterized in that, in the step of selecting a single piece of data from the basic data dictionary as the reference data based on the current dissolved oxygen set value, current influent flow rate, and current turbidity, it includes the following steps: When there is only one piece of data in the dissolved oxygen reference set, use this single piece of data as the reference data; When there are multiple pieces of data in the dissolved oxygen reference set, select a single piece of data from the dissolved oxygen reference set based on the current influent flow rate and current turbidity as the reference data.

3. The automatic dissolved oxygen control method according to claim 2, characterized in that, in the step of selecting a data set from the basic data dictionary and constructing a dissolved oxygen reference set based on the current dissolved oxygen set value, it includes the following steps: Generate a dissolved oxygen set range based on the current dissolved oxygen set value and a preset dissolved oxygen allowable error value; Based on the dissolved oxygen set range, select a data set from the basic data dictionary and construct a dissolved oxygen reference set.

4. The automatic dissolved oxygen control method according to claim 1, characterized in that, in the step of selecting a single piece of data from the basic data dictionary as the reference data based on the current dissolved oxygen set value, current influent flow rate, and current turbidity, it includes the following steps: When there is only one piece of data in the influent reference set, use this single piece of data as the reference data; In the case where there are multiple pieces of data in the influent reference set, a single piece of data is screened out from the influent reference set based on the current turbidity as the reference data.

5. The dissolved oxygen automatic control method according to claim 4, characterized in that In the step of screening out a data set from the basic data dictionary based on the current influent flow rate and constructing the influent reference set, the following steps are included: Based on the current influent flow rate and a preset allowable error value of the influent volume, an influent volume range is generated; Based on the influent volume range, a data set is screened out from the basic data dictionary and the influent reference set is constructed.

6. The dissolved oxygen automatic control method according to claim 5, characterized in that: In the case where there are multiple pieces of specific turbidity data in the influent reference set, the allowable error value of the influent volume is updated based on a preset influent volume screening coefficient, and the influent volume range and the influent reference set are updated; wherein the specific turbidity data is data with a turbidity equal to the current turbidity, and the updated influent volume range is smaller than the updated influent volume range.

7. The dissolved oxygen automatic control method according to claim 1, characterized in that In the step of screening out a single piece of data from the basic data dictionary as the reference data based on the current dissolved oxygen set value, the current influent flow rate, and the current turbidity, the following steps are included: In the case where there is only a single piece of data in the turbidity reference set, this single piece of data is used as the reference data.

8. The dissolved oxygen automatic control method according to claim 7, characterized in that In the step of screening out a data set from the basic data dictionary based on the current turbidity and constructing the turbidity reference set, the following steps are included: Based on the current turbidity and a preset allowable error value of the turbidity, a turbidity range is generated; Based on the turbidity range, a data set is screened out from the basic data dictionary and the turbidity reference set is constructed.

9. The dissolved oxygen automatic control method according to claim 8, characterized in that: In the case where there are multiple pieces of specific influent volume data in the turbidity reference set, the allowable error value of the turbidity is updated based on a preset turbidity screening coefficient, and the turbidity range and the turbidity reference set are updated; wherein the specific influent volume data is data with an influent flow rate equal to the current influent flow rate, and the updated turbidity range is smaller than the updated turbidity range.

10. A dissolved oxygen automatic control system, characterized in that: It includes a storage device (1), a human-computer interaction device (2), a detection device (3), a control device (5), and an aeration device (4); Historical measured data is stored in the storage device (1) to construct a basic data dictionary; The human-computer interaction device (2) is used to send a preset current dissolved oxygen set value to the control device (5); The detection device (3) is used to detect the influent flow rate and turbidity in real time, and send the current influent flow rate and the current turbidity to the control device (5); The control device (5) screens out a single piece of data from the basic data dictionary as the reference data based on the current dissolved oxygen set value, the current influent flow rate, and the current turbidity; The control device (5) controls the current opening degree of the intake valve of the aeration device (4) based on the actual opening degree of the intake valve in the reference data. The control device (5) filters out data sets from the basic data dictionary based on the current dissolved oxygen set value and constructs a dissolved oxygen reference set; the control device (5) filters out data sets from the basic data dictionary based on the current influent flow rate and constructs an influent reference set; the control device (5) filters out data sets from the basic data dictionary based on the current turbidity and constructs a turbidity reference set; In the case where the current dissolved oxygen set value is incorrect due to misoperation by the staff and / or the data of the current working condition does not meet the treatment standard of the current biochemical tank, there is no data in the dissolved oxygen reference set, the influent reference set or the turbidity reference set; In the case where there is no data in the dissolved oxygen reference set, the influent reference set or the turbidity reference set, the control device (5) filters out data from the basic data dictionary based on the current influent flow rate and the current turbidity and constructs a set reference set; In the case where there is data in the set reference set, the control device (5) generates a set reference range based on the measured dissolved oxygen value in the set reference set, In the case where there is no data in the set reference set, the control device (5) determines that the data of the current working condition does not meet the treatment standard of the current biochemical tank and issues a prompt.

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