Water treatment control system and method

Abstract

The present application provides a water treatment control system and method, which relates to the field of water treatment technology. The system includes: a fan system, at least one biological reactor and a control system; wherein the fan system includes: at least one fan, the outlet of each fan is connected to the inlet of the main air duct through a branch air duct; the outlet of the main air duct is connected to the air duct of each biological reactor; each biological reactor is provided with a dissolved oxygen meter; each biological reactor air duct is also provided with a regulating valve; wherein the dissolved oxygen meter and the regulating valve are respectively communicated and connected to the control system, so that the control system calculates the target air volume required for each biological reactor according to the dissolved oxygen value in each biological reactor detected by the dissolved oxygen meter, and adjusts the opening of the regulating valve according to the target air volume to adjust the air volume delivered to each biological reactor. Compared with the existing technology, it avoids the problems of large fluctuations in dissolved oxygen concentration, large aeration power consumption, waste of resources and inaccurate aeration.

Description

Technical Field

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

[0002] Wastewater treatment is the process of purifying sewage to meet the water quality requirements for discharge into a water body or reuse. Wastewater treatment is widely used in various fields such as construction, agriculture, transportation, energy, petrochemicals, environmental protection, urban landscape, medical care, and catering, and is increasingly entering the daily lives of ordinary people. The sewage treatment process has the characteristics of nonlinearity, hysteresis, and time-varying properties, making it a relatively difficult control object. The sewage treatment biochemical aerobic tank is an important component of water treatment using the activated sludge method. The tank must provide a certain sewage retention time to meet the oxygen requirements of aerobic microorganisms and the mixing conditions for sufficient contact between sewage and activated sludge. The aeration system of the aerobic tank is a key link in the control of sewage plant effluent indicators and energy consumption.

[0003] At present, most domestic sewage treatment plants are still in the stage of manually controlling air blowing and aeration, that is, according to the values ​​displayed by the dissolved oxygen meter, through manual calculation or operating experience, the open-loop constant control valve opening is given to maintain a stable and abundant aeration volume.

[0004] Although manual control of excessive aeration can ensure that the effluent water quality does not fluctuate significantly, there are problems such as large fluctuations in dissolved oxygen concentration and inaccurate aeration. Summary of the Invention

[0005] The purpose of this application is to provide a water treatment control system and method to address the deficiencies in the above-mentioned prior art, so as to solve the problems of large fluctuations in dissolved oxygen concentration and inaccurate aeration in the prior art.

[0006] To achieve the above objectives, the technical solutions adopted in the embodiments of the present application are as follows:

[0007] In a first aspect, an embodiment of the present application provides a water treatment control system, comprising: a fan system, at least one biological reactor, and a control system; wherein the fan system comprises: at least one fan, the outlet of each fan being connected to the inlet of a main air duct via a branch air duct; the outlet of the main air duct being connected to the air duct of each biological reactor;

[0008] Each biological reaction tank is provided with a dissolved oxygen meter; and the air duct of each biological reaction tank is also provided with a regulating valve;

[0009] The dissolved oxygen meter and the regulating valve are respectively communicatively connected to the control system, so that the control system calculates the target air volume required for each biological reaction pool according to the dissolved oxygen value in each biological reaction pool detected by the dissolved oxygen meter, and adjusts the opening of the regulating valve according to the target air volume to adjust the air volume delivered to each biological reaction pool.

[0010] Optionally, a flow meter is provided on the air duct of each biological reaction tank;

[0011] The flow meter is also communicatively connected to the control system so that the control system adjusts the opening of the regulating valve according to the target air volume until the air volume output to each bioreactor tank measured by the flow meter after adjustment matches the preset dissolved oxygen value of each bioreactor tank.

[0012] Optionally, the control system is a distributed control system;

[0013] The dissolved oxygen meter, the flow meter, and the regulating valve are respectively communicatively connected to a first-level control system in the distributed control system.

[0014] Optionally, a first wind pressure transmitter is provided on the main air duct to detect the main duct wind pressure on the main air duct;

[0015] The first wind pressure transmitter is connected to the second-level control system in the distributed control system, so that the second-level control system is linked to the frequency converter of the at least one wind turbine according to the main pipe wind pressure control.

[0016] Optionally, a second wind pressure transmitter is provided on the branch air duct of each fan to detect the wind pressure output by each fan;

[0017] The frequency converter of each fan and the second wind pressure transmitter are respectively communicated with the second-level control system, so that the second-level control system performs frequency conversion and speed regulation on each fan according to the main pipe wind pressure and the wind pressure output by each fan, so that the total wind pressure output by at least one fan meets the requirements of the main pipe wind pressure.

[0018] In a second aspect, another embodiment of the present application provides a water treatment control method, which is applied to the control system in the water treatment control system described in the first aspect above, and the method includes:

[0019] The first control system in the control system calculates the target air volume required for each biological reaction tank according to the dissolved oxygen value in each biological reaction tank detected by the dissolved oxygen meter;

[0020] The first control system adjusts the opening of the regulating valve according to the target air volume to adjust the air volume delivered to each biological reaction tank.

[0021] Optionally, the first control system in the control system calculates the target air volume required for each biological reaction tank according to the dissolved oxygen value in each biological reaction tank detected by the dissolved oxygen meter, including:

[0022] The first control system calculates the target air volume according to a comparison result between the dissolved oxygen value and a preset dissolved oxygen value.

[0023] Optionally, the first control system adjusts the opening of the regulating valve according to the target air volume, including:

[0024] The first control system adjusts the opening of the regulating valve according to the target air volume until the air volume output to each bioreactor measured by the flow meter after adjustment matches the preset dissolved oxygen value of each bioreactor.

[0025] Optionally, the method further includes:

[0026] The second-level control system controls the frequency converter of the at least one fan to perform linkage according to the main pipe wind pressure control.

[0027] Optionally, the method further includes:

[0028] The second-level control system performs variable frequency speed regulation on each fan according to the main pipe wind pressure and the wind pressure output by each fan, so that the total wind pressure output by at least one fan meets the main pipe wind pressure requirement.

[0029] In a third aspect, another embodiment of the present application provides a water treatment control device, the device comprising: a calculation module and a first adjustment module, the calculation module and the first adjustment module can be arranged in a first-level control system in the control system.

[0030] The calculation module is used to calculate the target air volume required for each biological reaction tank according to the dissolved oxygen value in each biological reaction tank detected by the dissolved oxygen meter;

[0031] The first regulating module is used to regulate the opening of the regulating valve according to the target air volume, so as to regulate the air volume delivered to each biological reaction tank.

[0032] Optionally, the calculation module is specifically configured to calculate the target air volume based on a comparison result of the dissolved oxygen value and a preset dissolved oxygen value.

[0033] Optionally, the first regulating module is specifically configured to adjust the opening of the regulating valve according to the target air volume until the air volume output to each bioreactor measured by the flow meter after adjustment matches a preset dissolved oxygen value of each bioreactor.

[0034] Optionally, the device further comprises: a matching module, which may be provided in the second-level control system and may be used to control and match the frequency converter of the at least one fan for linkage according to the main pipe wind pressure.

[0035] Optionally, the device also includes: a second adjustment module, which can be arranged in a second-level control system, and is used for the second-level control system to perform variable frequency speed regulation on each fan according to the main pipe wind pressure and the wind pressure output by each fan, so that the total wind pressure output by at least one fan meets the requirement of the main pipe wind pressure.

[0036] In the fourth aspect, another embodiment of the present application provides a water treatment control device, comprising: a processor, a storage medium and a bus, wherein the storage medium stores machine-readable instructions executable by the processor. When the water treatment control device is running, the processor communicates with the storage medium through the bus, and the processor executes the machine-readable instructions to perform the steps of any method described in the second aspect above.

[0037] In the fifth aspect, another embodiment of the present application provides a storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of any method described in the second aspect are executed.

[0038] With the water treatment control system provided by the present application, closed-loop control is established between the dissolved oxygen meter and the regulating valve through the control system. Therefore, the regulating valve can determine the target air volume corresponding to each bioreactor tank at any time based on the dissolved oxygen value in each bioreactor tank detected by the dissolved oxygen meter, and adjust the opening of the corresponding regulating valve according to the target air volume, thereby adjusting the air volume delivered to each bioreactor tank. In this way, continuous automatic adjustment is performed, so that the oxygen demand and the target air volume are matched, the dissolved oxygen concentration in each bioreactor tank fluctuates slightly, and the problem of inaccurate aeration is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0040] Figure 1A schematic diagram of the structure of a water treatment control system provided in one embodiment of the present application;

[0041] Figure 2 A schematic structural diagram of a water treatment control system provided in another embodiment of the present application;

[0042] Figure 3 A schematic structural diagram of a water treatment control system provided in another embodiment of the present application;

[0043] Figure 4 A schematic structural diagram of a water treatment control system provided in another embodiment of the present application;

[0044] Figure 5 A schematic structural diagram of a water treatment control system provided in another embodiment of the present application;

[0045] Figure 6 A flow chart of a water treatment control method provided in one embodiment of the present application;

[0046] Figure 7 A schematic flow chart of a water treatment control method provided in another embodiment of the present application;

[0047] Figure 8 A schematic flow chart of a water treatment control method provided in another embodiment of the present application;

[0048] Figure 9 A schematic structural diagram of a water treatment control device provided in one embodiment of the present application;

[0049] Figure 10 A schematic structural diagram of a water treatment control device provided in another embodiment of the present application;

[0050] Figure 11 This is a structural diagram of a water treatment control device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments.

[0052] The components of the embodiments of the present application generally described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but rather merely represents selected embodiments of the present application. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without creative effort are within the scope of protection of the present application.

[0053] In addition, the flowcharts used in this application illustrate operations implemented according to some embodiments of the present application. It should be understood that the operations of the flowcharts may not be implemented in order, and steps that have no logical contextual relationship may be reversed or performed simultaneously. In addition, those skilled in the art, guided by the content of this application, may add one or more other operations to the flowcharts, or may remove one or more operations from the flowcharts.

[0054] The following is an explanation of a water treatment control system provided by the embodiment of the present application with reference to a number of specific application examples. Figure 1 This is a schematic diagram of a water treatment control system provided in one embodiment of the present application, as shown in FIG. Figure 1 As shown, the water treatment control system 100 includes: a fan system 110, at least one biological reactor 120 and a control system 130; wherein, the fan system 110 includes: at least one fan 111, the outlet of each fan 111 is connected to the inlet of the main air duct through a branch air duct; the outlet of the main air duct is connected to the air duct of each biological reactor 121.

[0055] Each bioreactor tank 120 is equipped with a dissolved oxygen meter 121; a regulating valve 122 is also installed on the air duct of each bioreactor tank 120. The dissolved oxygen meter 121 is a dissolved oxygen meter, also known as an online dissolved oxygen meter. Dissolved oxygen meter 121 is installed within the bioreactor tank 120, meaning its probe is placed within the bioreactor tank 120. The dissolved oxygen meter 121 can be used to detect dissolved oxygen levels, such as dissolved oxygen concentration, in the water within the bioreactor tank 120 and display the test results. The regulating valve 122 can be used to adjust the air volume delivered to each bioreactor tank 120.

[0056] Among them, although the dissolved oxygen meter 121 and the regulating valve 122 are wirelessly connected to the control system 130 in the attached figure, it should be understood that the above connection method is only a connection method in one embodiment. In the embodiment provided in this application, the dissolved oxygen meter 121 and the regulating valve 122 are respectively connected to the control system 130 for communication. Among them, the communication connection can be wired communication or wireless communication. Figure 1 The wireless communication shown is not limited in this application.

[0057] The dissolved oxygen meter 121 and the regulating valve 122 are respectively communicated with the control system 130, so that the control system 130 calculates the target air volume required for each bioreactor 120 based on the dissolved oxygen value in each bioreactor 120 detected by the dissolved oxygen meter 121, and adjusts the opening of the regulating valve 122 according to the target air volume. The regulating valve 122 is an air volume regulating valve, also known as an air regulating valve, which is used to adjust the air volume delivered to each bioreactor 120.

[0058] Specifically, the dissolved oxygen meter 121, acting as a dissolved oxygen analysis transmitter (AIT), can detect the dissolved oxygen value in each bioreactor 120 and transmit it to the control system 130. The analysis and display (AI) logic function module in the control system 130 can process and display the dissolved oxygen value. The analysis and calculation (AY) logic function module in the control system 130 can analyze and calculate the dissolved oxygen value, for example, by comparing the dissolved oxygen value with a preset dissolved oxygen value corresponding to each bioreactor. The flow calculation (FY) logic function module in the control system 130 can also calculate the target air volume required for each bioreactor 120 based on the analysis and comparison results, that is, the air flow required for each bioreactor 120. The FY logic function module can, for example, be a preset PID closed-loop control logic function module.

[0059] After calculating the target air volume, the control system 130 may also display the flow value through the flow display (FI) logic function module. Furthermore, the flow control (FC) logic function module in the control system 130 may also adjust and control the opening of the regulating valve 122 based on the calculated target air volume. For example, the opening value of the regulating valve 122 may be set based on the target air volume, so that the regulating valve 122 can provide an output air volume based on the set opening value.

[0060] Among them, the control system 130 is also pre-set with the oxygen demand corresponding to each biological reaction tank 120, that is, the preset dissolved oxygen value corresponding to each biological reaction tank 120. The dissolved oxygen value detected by the dissolved oxygen meter 121 is actually the measured dissolved oxygen value of each biological reaction tank 120. This method of determining the target air volume based on the detected dissolved oxygen value and the preset dissolved oxygen value, and then adjusting the opening of the regulating valve 122 based on the target air volume, allows the target air volume to be adjusted according to the oxygen demand and the actual dissolved oxygen, thereby achieving a precise aeration control effect.

[0061] With the water treatment control system provided by the present application, closed-loop control is established between the dissolved oxygen meter and the regulating valve through the control system, so that the regulating valve can determine the target air volume corresponding to each bioreactor tank at any time according to the dissolved oxygen value in each bioreactor tank detected by the dissolved oxygen meter, and adjust the opening of the corresponding regulating valve according to the target air volume, thereby adjusting the air volume delivered to each bioreactor tank. In this way, continuous automatic adjustment is performed to match the oxygen demand and the target air volume, thereby achieving precise aeration, with small fluctuations in the dissolved oxygen concentration in each bioreactor tank, solving the problem of inaccurate aeration, and achieving precise control of biochemical aerobics.

[0062] For example, in one embodiment of the present application, each fan 111 is an air suspension fan. It should be understood that the type of specific fan can be flexibly adjusted according to user needs and is not limited to the above embodiment.

[0063] Optionally, based on the above embodiment, the embodiment of the present application may further provide a water treatment control system, and the structure of the above system is further illustrated below with reference to the accompanying drawings. Figure 2 This is a structural diagram of a water treatment control system provided by another embodiment of the present application, such as Figure 2 As shown, a flow meter 123 is provided on the air duct of each bioreactor 120 to measure the air volume on each air duct. The air volume detected by the flow meter 123 on the air duct of the bioreactor 120 is actually the air volume output by the fan system to each bioreactor 120.

[0064] The flow meter 123 is also communicatively connected to the control system 130 so that the control system 130 adjusts the opening of the regulating valve 122 according to the target air volume until the air volume output to each bioreactor 120 measured by the flow meter 123 after adjustment matches the preset dissolved oxygen value; that is, the adjusted air volume is the target air volume.

[0065] The control system 130 continuously and repeatedly adjusts the opening of the regulating valve 122. That is, after adjusting the opening of the regulating valve 122 based on the currently monitored dissolved oxygen value, the dissolved oxygen value in each biological reaction tank 120 is monitored again, and the target air volume is re-determined based on the re-monitored dissolved oxygen value. The opening of the regulating valve 122 is adjusted again based on the re-determined target air volume. This continuous and repeated automatic adjustment is carried out until the preset dissolved oxygen value, i.e., the oxygen demand, matches the required air volume, i.e., the target air volume, thereby achieving precise aeration control.

[0066] Optionally, in one embodiment of the present application, the control system 130 may be, for example, a distributed control system (DCS), which is a multi-level control system and may include a first-level control system 131. The first-level control system 131 is a first-level closed-loop control system that may be used to perform closed-loop control of a regulating valve on an air duct of each bioreactor tank based on the dissolved oxygen value of each bioreactor tank.

[0067] The dissolved oxygen meter 121 , the flow meter 123 and the regulating valve 122 are respectively connected to the first-level control system 131 in the distributed control system through communication.

[0068] For example, in one embodiment of the present application, the first-level control system 131 further includes: at least one air volume controller. Each air volume controller can be a PLC in the first-level control system 131. The dissolved oxygen meter 121, the flow meter 123, and the regulating valve 122 are respectively communicatively connected to the air volume controller of each bioreactor tank 120, so that the air volume controller of each bioreactor tank 120 calculates the target air volume required for each bioreactor tank 120 based on the dissolved oxygen value in each bioreactor tank 120 detected by the dissolved oxygen meter 121, and adjusts the opening of the regulating valve 122 based on the target air volume until the air volume output to each bioreactor tank 120 measured by the flow meter 123 matches the preset dissolved oxygen value after adjustment.

[0069] Optionally, based on the above embodiment, the embodiment of the present application may further provide a water treatment control system, and the structure of the above system is further illustrated below with reference to the accompanying drawings. Figure 3 This is a structural diagram of a water treatment control system provided by another embodiment of the present application. The control system 130 may further include a second-level control system 132. The second-level control system 132 is a second-level closed-loop control system, which can be used to perform variable frequency adjustment on the speed of the fan. Figure 3 As shown, a first air pressure transmitter (PT) 111 is provided on the main air duct to detect the main duct air pressure on the main air duct; the first air pressure transmitter 112 is connected to the second-level control system 132 in the distributed control system, so that the second-level control system 132 controls and matches the frequency converter of at least one fan 111 according to the main duct air pressure for linkage.

[0070] Among them, the second-level control system 132 can realize closed-loop control of the main duct air outlet volume by matching the inverter of at least one fan 111 according to the main duct air pressure control, thereby achieving the effect of accurately controlling the air pressure and air volume.

[0071] Specifically, the first air pressure transmitter (PT) is used to detect the main duct air pressure on the trunk air duct and transmit it to the second-level control system 132. The second-level control system 132 can then use a preset pressure display (PI) logic function module to process the pressure value and display the pressure. It can also use a preset pressure calculation (PY) logic function module to analyze the pressure value. The second-level control system 132 controls the inverter matching at least one fan 111 to perform linkage based on the analysis result, thereby controlling the air output of each fan 111. The sum of the air outputs of each fan 111 makes the air pressure on the trunk air duct reach the main duct air pressure. Among them, the PY logic function control module can, for example, be a preset PID closed control logic function control module.

[0072] Optionally, based on the above embodiment, the embodiment of the present application may further provide a water treatment control system, and the structure of the above system is further illustrated below with reference to the accompanying drawings. Figure 4 This is a structural diagram of a water treatment control system provided by another embodiment of the present application, such as Figure 4 As shown, a second wind pressure transmitter 113 is provided on the branch air duct of each fan 111 to detect the wind pressure output by each fan 111; the frequency converter and the second wind pressure transmitter 113 of each fan 111 are respectively communicated with the second-level control system 132, so that the second-level control system 132 can adjust the frequency of each fan 111 according to the main pipe wind pressure and the wind pressure output by each fan 111, so that the total wind pressure output by at least one fan 111 meets the main pipe wind pressure requirement.

[0073] Optionally, in one embodiment of the present application, the second-level control system 132 may include: a master control panel (MCP); a first wind pressure transmitter connected to the MCP, so that the MCP matches the frequency converter of at least one fan 111 according to the main pipe wind pressure for linkage.

[0074] Specifically, the frequency converter is used to control the air output corresponding to each fan 111 by changing the working power frequency of the motor corresponding to each fan 111, that is, by frequency control (SC). The preset pressure calculation (PY) logic function module can be used on the branch air duct corresponding to each fan 111 to analyze the pressure value, and then the preset pressure display (PI) logic function module can be used to process the pressure value and display the pressure of each branch air duct, wherein the PY logic function control module can, for example, be a preset PID closed control logic function control module.

[0075] This method of adjusting the total air pressure according to the main pipe air pressure requirement can control the inverter of at least one fan 111 to be linked according to the total air pressure requirement, so that the total air pressure of each fan 111 meets the main pipe air pressure requirement, thereby realizing closed-loop control and dynamic automatic adjustment of the total air pressure, achieving the effect of accurately controlling the air pressure and air volume, and solving the problems of high aeration power consumption and inaccurate aeration.

[0076] For example, in some possible embodiments, the second-level control system 132 also includes: at least one local control panel (LCP); the frequency converter and the second wind pressure transmitter of each fan 111 are respectively communicated with the LCP of each fan, so that the LCP of each fan can adjust the frequency of each fan 111 according to the main pipe wind pressure and the wind pressure output by each fan 111, so that the total wind pressure output by at least one fan 111 meets the main pipe wind pressure requirement.

[0077] The second-level control system continuously controls the module based on the PID closed-loop control logic function, and repeatedly adjusts dynamically and automatically to achieve precise control of the wind pressure and air volume.

[0078] The solution of this application utilizes the aforementioned dual closed-loop control technology, a two-stage closed-loop control system. Initially, once the sewage treatment process meets influent conditions and is put into operation, aeration parameters and control are adjusted in the aerobic tank. After a period of time, further adjustments are made to achieve relatively precise dynamic control matching between the bioreactor's changing oxygen demand, the air control valve opening, the duct pressure and volume, and the blower's variable frequency speed regulation. This dual closed-loop control and automatic adjustment technology for aeration in the biochemical aerobic stage has reduced the sewage treatment plant's electrical energy consumption by over 5%.

[0079] Optionally, in one embodiment of the present application, the distributed control system is a multi-level programmable logic controller (PLC) system. It should be understood that the type of specific distributed control system can be flexibly adjusted according to user needs and is not limited to the above embodiments.

[0080] Figure 5 This is a structural diagram of a water treatment control system provided in another embodiment of the present application, as shown in FIG. Figure 5 As shown, the water treatment control system is a two-stage closed-loop control system. The following describes the complete workflow of the water treatment control system 100 by taking the water treatment control system including two biological reaction tanks 120 and three fans 111 as an example:

[0081] The branch air ducts of the three fans are all connected to the main air duct, and the main air duct is respectively connected to the air duct of each biological reaction tank.

[0082] Among them, X1-AIT refers to the dissolved oxygen meter installed in the first bioreactor, X1-AI refers to the logic function module in the first-level control system that analyzes and displays (AI) the first bioreactor, and X1-AY refers to the logic function module in the first-level control system that analyzes and calculates (AY) the first bioreactor. X2-AIT refers to the dissolved oxygen meter installed in the second bioreactor, X2-AI refers to the logic function module in the second-level control system that analyzes and displays (AI) the second bioreactor, and X2-AY refers to the logic function module in the first-level control system that analyzes and calculates (AY) the second bioreactor.

[0083] The air duct of the first bioreactor is also provided with a flow meter 123 and a regulating valve 122. The first-level control system has a flow transmitter corresponding to the first bioreactor such as Figure 5 The flow display (FI) logic function module corresponding to X1-FIT and the first biological reaction pool is as follows: Figure 5The X1-FI in the first biological reaction pool and the flow calculation (FY) logic function module are as follows: Figure 5 X1-FY in.

[0084] The air duct of the second bioreactor is also provided with a flow meter 123 and a regulating valve 122. The first-level control system has a flow transmitter corresponding to the second bioreactor such as Figure 5 The flow display (FI) logic function module corresponding to the X2-FIT and the second biological reaction pool is as follows: Figure 5 The X2-FI in the second biological reaction pool and the flow calculation (FY) logic function module are as follows: Figure 5 X2-FY in.

[0085] Each fan's branch duct is equipped with a pressure transmitter. The X1-PT is the pressure transmitter for the first fan's branch duct, the X2-PT is the pressure transmitter for the second fan in the control system, and the X3-PT is the pressure transmitter for the third fan in the control system. The main duct is also equipped with a pressure transmitter, with the X4-PT being the pressure transmitter for the main duct.

[0086] The second-level control system has a pressure display (PI) logic function module corresponding to the first fan, such as Figure 5 The X1-PI and the pressure calculation (PY) logic function modules corresponding to the first fan are as follows: Figure 5 The frequency control (SC) logic function module corresponding to X1-PY and the first fan is as follows: Figure 5 X1-SC in the second fan; it also has a pressure display (PI) logic function module corresponding to the second fan. Figure 5 The X2-PI and the pressure calculation (PY) logic function modules corresponding to the second fan are as follows: Figure 5 The frequency control (SC) logic function module corresponding to X2-PY and the second fan is as follows: Figure 5 X2-SC in the third fan; also has the pressure display (PI) logic function module corresponding to the third fan. Figure 5 The X3-PI in the third fan and the corresponding pressure calculation (PY) logic function module are as follows: Figure 5 The frequency control (SC) logic function module corresponding to the third fan in X3-PY is as follows: Figure 5 X3-SC in.

[0087] The second-level control system also has a pressure display (PI) logic function module corresponding to the main air duct, such as Figure 5 The X4-PI and the pressure calculation (PY) logic function modules corresponding to the main air duct are as follows: Figure 5 X4-PY in.

[0088] The first-level control system 131 may be, for example, a PLC system. The dissolved oxygen meter 121 within each bioreactor 120 functions as a dissolved oxygen analysis transmitter (AIT), establishing a closed-loop control loop with the regulating valve 122 via the PLC. The dissolved oxygen meter 121 within each bioreactor 120 measures the actual dissolved oxygen value in the water and uploads it to the PLC system. The PLC system then processes and displays the dissolved oxygen value using a preset analysis and display (AI) logic control module. It also analyzes and calculates the dissolved oxygen value using a preset analysis and calculation (AY) logic control module, comparing it with a preset oxygen demand (taking into account hysteresis). Based on the analysis and comparison results, the PLC system also calculates the target air volume required for each bioreactor 120 using a preset flow calculation (FY) logic control module, such as a PID controller, and displays the flow rate (FI). Furthermore, the PLC system can also use the flow control (FC) logic function control module to adjust the opening of the regulating valve 122 based on the calculated target air volume. For example, the opening value of the regulating valve 122 is set based on the target air volume, so that the regulating valve 122 can provide an output air volume based on the set opening value. This continuous and automatic adjustment of the opening value of the regulating valve 122 ensures that the preset oxygen demand corresponding to each bioreactor 120 matches the target air volume, thereby achieving precise aeration control.

[0089] Secondly, the second-level control system 132 is used for closed-loop control of the air output through the main air duct pressure and the frequency conversion linkage between the three fans 111. The change in the actual oxygen demand corresponding to each biological reactor 120 forms a change in the main air duct pressure. After the second-level control system obtains the main air duct pressure value uploaded by the first air pressure transmitter (PT), the second-level control system 132 can use the preset pressure display (PI) logic function control module to process the pressure value and then display the pressure. It can also use the preset pressure logic function control module (PY) to analyze the pressure value and control the three fans 111 to work in conjunction; and through the air pressure transmitter set on the outlet branch air duct of each blower, the air pressure value corresponding to each fan 111 is transmitted to the corresponding local control panel LCP, and the LCP is used Control the variable frequency speed regulation of the corresponding fan 111, that is, control the air output corresponding to each fan 111 by means of frequency control (SC). A preset pressure logic function control module (PY) can be used on the branch air duct corresponding to each fan 111 to analyze the pressure value. Subsequently, a preset pressure display (PI) logic function control module can be used to process the pressure value and then display the pressure of each branch air duct so that the total air pressure of each branch air duct corresponding to the three fans 111 meets the main duct air pressure requirement. In this way, the continuous dynamic automatic adjustment based on the PID closed-loop control logic function control module can achieve the goal of accurately controlling the air pressure and air volume.

[0090] For example, in one embodiment of the present application, after the sewage treatment process meets water inlet conditions and is put into operation, the corresponding aeration parameters and control adjustment parameters of each biological reactor 120 can be preliminarily set. For example, the oxygen demand corresponding to each biological reactor 120 can be set. After the water treatment control system 100 has been operating for a period of time, the opening value of the regulating valve 122 and the corresponding wind pressure value of each fan 111 are deeply adjusted through the closed-loop control method provided in the above embodiment. This ensures that the changes in the oxygen demand in the biological reactor 120, the opening value of the regulating valve 122, the air duct air pressure and air volume, and the variable frequency speed regulation of the fan 111 are dynamically controlled and matched with each other in a relatively precise manner, thereby significantly saving the electricity consumption of the sewage treatment plant.

[0091] By adopting the water treatment control system provided by the present application, a dual closed-loop automatic control system with the goal of dissolved oxygen concentration control and blower frequency regulation is realized through the setting of the first-level control system and the second-level control system. It can not only relatively accurately control the water outlet indicators, but also solve the problem of open-loop determination of the blower volume in the prior art, which leads to large fluctuations in the dissolved oxygen concentration in each biological reaction tank, large aeration power consumption and inaccurate aeration, reduces the power consumption problem caused by excessive aeration, reduces the fluctuation of dissolved oxygen concentration, saves power consumption and improves the accuracy of aeration.

[0092] The following is an explanation of a water treatment control method provided in an embodiment of the present application in combination with a number of specific application examples. Figure 6 A flow chart of a water treatment control method provided in one embodiment of the present application, which is applied to the above Figure 1 - Figure 5 The control system in the water treatment control system, such as Figure 6 As shown, the method includes:

[0093] S201: The first control system in the control system calculates the target air volume required for each biological reaction tank according to the dissolved oxygen value in each biological reaction tank detected by the dissolved oxygen meter.

[0094] S202: The first control system adjusts the opening of the regulating valve according to the target air volume to adjust the air volume delivered to each bioreactor.

[0095] With the water treatment control method provided in the present application, the control system can calculate the target air volume required for each bioreactor based on the dissolved oxygen value in each bioreactor detected by the dissolved oxygen meter; and adjust the opening of the regulating valve according to the target air volume, so that the air volume delivered to each bioreactor is the target air volume required by each bioreactor. This arrangement establishes a closed-loop control between the dissolved oxygen meter and the regulating valve through the control system, so that the regulating valve can determine the target air volume corresponding to each bioreactor at any time based on the dissolved oxygen value in each bioreactor detected by the dissolved oxygen meter, and adjust the opening of the corresponding regulating valve according to the target air volume, thereby adjusting the air volume delivered to each bioreactor. In this way, continuous automatic adjustment is performed, so that the oxygen demand and the target air volume are matched, the dissolved oxygen concentration in each bioreactor fluctuates slightly, and the problem of inaccurate aeration is solved.

[0096] Optionally, in an embodiment of the present application, S201 may be, for example: the first control system calculates the target air volume according to the dissolved oxygen value and a comparison result of a preset dissolved oxygen value.

[0097] For example, in some possible embodiments, S202 may be the first control system adjusting the opening of the regulating valve according to the target air volume until the air volume output to each bioreactor measured by the flow meter after adjustment matches the preset dissolved oxygen value of each bioreactor.

[0098] Optionally, based on the above embodiment, the embodiment of the present application may further provide a water treatment control method, and the implementation process of the above method is illustrated below with reference to the accompanying drawings. Figure 7 A flow chart of a water treatment control method provided in another embodiment of the present application is shown as follows: Figure 7 As shown, the method further includes:

[0099] S203: The second-level control system controls and links the frequency converter of at least one fan according to the main pipe wind pressure control.

[0100] Optionally, based on the above embodiment, the embodiment of the present application may further provide a water treatment control method, and the implementation process of the above method is illustrated below with reference to the accompanying drawings. Figure 8 A flow chart of a water treatment control method provided in another embodiment of the present application is shown as follows: Figure 8 As shown, the method further includes:

[0101] S204: The second-level control system performs frequency conversion speed regulation on each fan according to the main duct air pressure and the air pressure output by each fan, so that the total air pressure output by at least one fan meets the main duct air pressure requirement.

[0102] By adopting the water treatment control method provided in the present application, a dual closed-loop automatic control system with the goal of dissolved oxygen concentration control and blower frequency regulation is realized through the first-level control system and the second-level control system in the control system. It can not only relatively accurately control the water outlet indicators, but also solve the problem of open-loop determination of the blower volume in the prior art, which leads to large fluctuations in the dissolved oxygen concentration in each biological reaction tank, large aeration power consumption and inaccurate aeration, reduces the power consumption problem caused by excessive aeration, reduces the fluctuation of dissolved oxygen concentration, saves power consumption and improves the accuracy of aeration.

[0103] The following is an explanation of the water treatment control device provided by this application with reference to the accompanying drawings. The water treatment control device can perform the above Figure 6-Figure 8 The specific implementation and beneficial effects of any water treatment control method are as described above and will not be repeated below.

[0104] Figure 9 This is a schematic diagram of the structure of a water treatment control device provided in one embodiment of the present application, as shown in FIG. Figure 9 As shown, the device includes: a calculation module 301 and a first adjustment module 302, and the calculation module 301 and the first adjustment module 302 can be set in the first level control system in the control system.

[0105] A calculation module 301 is used to calculate the target air volume required for each bioreactor according to the dissolved oxygen value in each bioreactor detected by the dissolved oxygen meter;

[0106] The first regulating module 302 is used to regulate the opening of the regulating valve according to the target air volume, so as to regulate the air volume delivered to each bioreactor.

[0107] Optionally, the calculation module 301 is specifically configured to calculate the target air volume according to the dissolved oxygen value and a comparison result of a preset dissolved oxygen value.

[0108] Optionally, the first regulating module 302 is specifically configured to regulate the opening of the regulating valve according to the target air volume until the air volume output to each bioreactor measured by the flow meter after regulation matches a preset dissolved oxygen value of each bioreactor.

[0109] Figure 10 This is a structural diagram of a water treatment control device provided in another embodiment of the present application, as shown in FIG. Figure 10 As shown, the device further includes: a matching module 303, which can be provided in the second-level control system and can be used to control and match the frequency converter of at least one fan for linkage according to the main pipe wind pressure.

[0110] like Figure 10As shown, the device also includes: a second regulating module 304, which can be set in the second-level control system, and is used to perform variable frequency speed regulation on each fan according to the main pipe wind pressure and the wind pressure output by each fan, so that the total wind pressure output by at least one fan meets the main pipe wind pressure requirement.

[0111] The above-mentioned device is used to execute the method provided in the above-mentioned embodiment. Its implementation principle and technical effect are similar and will not be repeated here.

[0112] The above modules can be one or more integrated circuits configured to implement the above methods, such as one or more application-specific integrated circuits (ASICs), one or more digital singnal processors (DSPs), or one or more field programmable gate arrays (FPGAs). For another example, when a module is implemented by scheduling program code through a processing element, the processing element can be a general-purpose processor, such as a central processing unit (CPU) or other processor that can call program code. For another example, these modules can be integrated together and implemented in the form of a system-on-a-chip (SOC).

[0113] Figure 11 This is a structural diagram of a water treatment control device provided in one embodiment of the present application.

[0114] The water treatment control device includes: a processor 501 , a storage medium 502 and a bus 503 .

[0115] The processor 501 is used to store programs. The processor 501 calls the program stored in the storage medium 502 to execute the above Figure 6 - Figure 8 The operations performed by the first-level control system and / or the second-level control system in the corresponding method embodiments are similar in specific implementation and technical effects and will not be described in detail here.

[0116] Optionally, the present application also provides a program product, such as a storage medium, on which a computer program is stored, including a program that, when executed by a processor, executes an embodiment corresponding to the above method.

[0117] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0118] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0119] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or in the form of hardware plus software functional units.

[0120] The above-mentioned integrated unit implemented in the form of a software functional unit can be stored in a computer-readable storage medium. The above-mentioned software functional unit is stored in a storage medium, including a number of instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) or a processor (English: processor) to perform some steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (English: Read-Only Memory, abbreviated: ROM), random access memory (English: Random Access Memory, abbreviated: RAM), disk or optical disk and other media that can store program code.

Claims

1. A water treatment control system, characterized in that: The water treatment control system includes: a fan system, at least one biological reaction tank and a control system; wherein the fan system includes: at least one fan, the outlet of each fan is connected to the inlet of the main air duct through a branch air duct; the outlet of the main air duct is connected to the air duct of each biological reaction tank; Each biological reaction tank is provided with a dissolved oxygen meter; the air duct of each biological reaction tank is also provided with a regulating valve and a flow meter; The dissolved oxygen meter and the regulating valve are respectively communicatively connected to the control system, so that the control system calculates the target air volume required for each bioreactor tank based on the dissolved oxygen value in each bioreactor tank detected by the dissolved oxygen meter, and adjusts the opening of the regulating valve according to the target air volume to adjust the air volume delivered to each bioreactor tank; the flow meter is also communicatively connected to the control system, so that the control system adjusts the opening of the regulating valve according to the target air volume until the air volume output to each bioreactor tank measured by the flow meter after adjustment matches the preset dissolved oxygen value of each bioreactor tank; Wherein, the control system is a distributed control system; the distributed control system is a multi-level control system, and the distributed control system includes: a first-level control system and a second-level control system; The first-level control system is a first-level closed-loop control system, which is used to perform closed-loop control on the regulating valve on the air duct of each biological reaction tank based on the dissolved oxygen value of each biological reaction tank; the second-level control system is a second-level closed-loop control system, which is used to perform variable-frequency adjustment on the speed of the fan; The first-level control system includes: at least one air volume controller; the dissolved oxygen meter, the flow meter, and the regulating valve are respectively communicatively connected to the air volume controller of each bioreactor tank, so that the air volume controller of each bioreactor tank calculates the target air volume required for each bioreactor tank based on the dissolved oxygen value in each bioreactor tank detected by the dissolved oxygen meter and a comparison result of a preset dissolved oxygen value through a preset PID closed control logic function module, and adjusts the opening of the regulating valve until the air volume output to each bioreactor tank measured by the flow meter after adjustment matches the preset dissolved oxygen value of each bioreactor tank; Wherein, the main air duct is provided with a first air pressure transmitter to detect the main air pressure on the main air duct; the branch air duct of each fan is provided with a second air pressure transmitter to detect the air pressure output by each fan; The second-level control system includes: a main control board and at least one local control board; the first wind pressure transmitter is connected to the main control board; so that the main control board matches the frequency converter of the at least one fan according to the main pipe wind pressure control to perform linkage; the frequency converter of each fan and the second wind pressure transmitter are respectively communicated and connected to the main control board of each fan, so that the main control board of each fan performs frequency conversion and speed regulation on each fan according to the main pipe wind pressure and the wind pressure output by each fan through the preset PID closed control logic function control module, so that the total wind pressure output by the at least one fan meets the main pipe wind pressure requirement.

2. A water treatment control method, characterized in that: The control system applied to the water treatment control system according to claim 1, wherein the method comprises: The first control system in the control system calculates the target air volume required for each biological reaction tank according to the dissolved oxygen value in each biological reaction tank detected by the dissolved oxygen meter; The first control system adjusts the opening of the regulating valve according to the target air volume to adjust the air volume delivered to each biological reaction tank; The first control system in the control system calculates the target air volume required for each biological reaction pool according to the dissolved oxygen value in each biological reaction pool detected by the dissolved oxygen meter, including: The first control system calculates the target air volume according to a comparison result between the dissolved oxygen value and a preset dissolved oxygen value; The first control system adjusts the opening of the regulating valve according to the target air volume, including: The first control system adjusts the opening of the regulating valve according to the target air volume until the air volume output to each bioreactor measured by the flow meter after adjustment matches the preset dissolved oxygen value of each bioreactor; Among them, the second-level control system is linked to the frequency converter of at least one fan according to the main pipe wind pressure control; The second-level control system performs variable frequency speed regulation on each fan according to the main pipe wind pressure and the wind pressure output by each fan, so that the total wind pressure output by at least one fan meets the main pipe wind pressure requirement.

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