Electrocatalytic oxidation control method, control system, medium and product

Abstract

The application discloses an electro-catalytic oxidation control method, a control system, a medium and a product, and relates to the field of electric digital data processing. According to the application, the control system determines a COD allowable fluctuation interval based on the instantaneous water inflow COD concentration, then calculates the average current efficiency and uses the same to determine the working current, and then accurately controls the electro-catalytic oxidation process according to the current density and the hydraulic retention time. The adaptive control method can timely respond to the water quality change of the water inflow, ensures that the water outflow meets the standard, avoids energy waste, has higher treatment efficiency and better economy compared with the traditional constant current density control mode, and forms a closed-loop control when the water outflow exceeds the standard.

Description

Technical Field

[0001] This application relates to the field of electro-digital data processing, and in particular to an electrocatalytic oxidation control method, control system, medium, and product. Background Technology

[0002] With the continuous advancement of industrialization, the demand for industrial wastewater treatment is increasing daily. Electrocatalytic oxidation technology, due to its high efficiency, environmental friendliness, and ease of automation, shows great application potential in treating industrial wastewater containing recalcitrant organic matter. Electrocatalytic oxidation technology effectively degrades pollutants such as chemical oxygen demand (COD) in industrial wastewater by applying an electric field and utilizing active substances generated on the electrode surface and direct electron transfer.

[0003] Among related technologies, electrocatalytic oxidation technology mainly adopts a constant current density control mode for operation. That is, the operator sets the current density based on experience to drive the electrocatalytic oxidation reaction and adjusts the hydraulic retention time to achieve the required COD concentration in the effluent.

[0004] However, the COD concentration of industrial wastewater influent typically fluctuates significantly, making it difficult for constant current density control to respond promptly to changes in influent water quality. When the influent COD concentration is low, excessively high current density leads to energy waste; conversely, when the influent COD concentration is high, a fixed current density may not meet treatment requirements. Summary of the Invention

[0005] This application provides an electrocatalytic oxidation control method, control system, medium, and product for improving the processing efficiency of electrocatalytic oxidation.

[0006] In a first aspect, this application provides an electrocatalytic oxidation control method applied to a control system. The method includes: S101, acquiring the instantaneous influent flow rate and instantaneous influent COD concentration, and determining the allowable fluctuation range of COD based on the instantaneous influent COD concentration, wherein the allowable fluctuation range includes a preset number of influent COD concentrations; S102, inputting each influent COD concentration in the allowable fluctuation range into a preset current efficiency calculation formula to obtain a preset number of current efficiencies, and calculating the average current efficiency; S103, inputting the average current efficiency into a preset current calculation formula to obtain the operating current, and calculating the current density based on the operating current and the cross-sectional area of ​​the anode plate; S104, if the current density is less than or equal to a preset value, determining the ratio of the effective reaction volume of the reactor to the instantaneous influent flow rate as the hydraulic residence time; S105, detecting the effluent COD concentration after the hydraulic residence time; S106, if the effluent COD concentration is greater than the standard effluent COD concentration, adjusting the average current efficiency to the minimum current efficiency value, and re-executing steps S103 and S103 onwards.

[0007] By adopting the above technical solution, the control system determines the allowable fluctuation range of COD based on the instantaneous influent COD concentration, then calculates the average current efficiency and uses it to determine the operating current, and then precisely controls the electrocatalytic oxidation process according to the current density and hydraulic retention time. This adaptive control method can respond promptly to changes in influent water quality, ensuring that the effluent meets standards while avoiding energy waste. Compared with the traditional constant current density control mode, it has higher treatment efficiency and better economy. When the effluent exceeds the standard, the control system automatically adjusts the average current efficiency and re-executes the control process, thus forming a closed-loop control.

[0008] In conjunction with some embodiments of the first aspect, in some embodiments, after step S101, acquiring the instantaneous influent flow rate and instantaneous influent COD concentration, and determining the allowable fluctuation range of COD based on the instantaneous influent COD concentration, wherein the allowable fluctuation range of COD includes a preset amount of influent COD concentration, the method further includes: acquiring the influent flow rate of two adjacent detections, and calculating the rate of change of the influent flow rate between the two adjacent detections; if the rate of change of the influent flow rate shows that the influent flow rate increases by more than a preset first percentage, increasing the operating current based on the rate of change of the influent flow rate, and performing the step S103 of calculating the current density based on the operating current and the cross-sectional area of ​​the anode plate, and subsequent steps; if the rate of change of the influent flow rate shows that the influent flow rate decreases by more than a preset first percentage, decreasing the operating current based on the rate of change of the influent flow rate, and performing the step S103 of calculating the current density based on the operating current and the cross-sectional area of ​​the anode plate, and subsequent steps.

[0009] By adopting the above technical solution, the control system calculates the rate of change of influent flow between two consecutive detections. When the rate of change of influent flow exceeds a preset threshold, the operating current is adjusted accordingly. This allows the electrocatalytic oxidation process to quickly adapt to fluctuations in water volume, significantly improving the control system's adaptability to changes in hydraulic load and avoiding the low treatment efficiency problem caused by relying solely on adjusting the hydraulic residence time in traditional methods. Simultaneously, this dynamic adjustment method also helps maintain stable system operation and reduces the impact of sudden changes in water volume.

[0010] In conjunction with some embodiments of the first aspect, in some embodiments, the preset current efficiency calculation formula is as follows: =(CODin-CODout)×n×F×Qin / (M O2 ×Iin-out); where, The values ​​represent current efficiency, CODin represents the instantaneous influent COD concentration, CODout represents the instantaneous effluent COD concentration, n represents the stoichiometric coefficient of electron transfer, F represents the Faraday constant, Qin represents the instantaneous influent flow rate, and M... O2The value represents the molar mass of oxygen. Iin-out represents the current value corresponding to the instantaneous influent COD concentration and the instantaneous effluent COD concentration. The instantaneous effluent COD concentration refers to the effluent COD concentration measured at the same moment as the instantaneous influent COD concentration.

[0011] By adopting the above technical solution, the preset current efficiency calculation formula can accurately reflect the current utilization efficiency in the electrocatalytic oxidation process. The control system calculates the current efficiency in real time, which can assess the rationality of the current operating status and provide a basis for subsequent parameter adjustments, avoiding the uncertainty that may be brought about by empirical operation.

[0012] In conjunction with some embodiments of the first aspect, in some embodiments, the preset current calculation formula is: I = (CODin - CODstandard_out) × n × F × Qin / (M O2 × Where I represents the operating current, CODin represents the instantaneous influent COD concentration, CODstandard_out represents the standard effluent COD concentration, n represents the stoichiometric coefficient of electron transfer, F represents the Faraday constant, Qin represents the instantaneous influent flow rate, and M... O2 This indicates the molar mass of oxygen. This indicates the average current efficiency.

[0013] By adopting the above technical solution, the preset current calculation formula fully considers the stoichiometric relationship of pollutant degradation and Faraday's law, enabling the determination of the most suitable operating current based on actual treatment needs. Compared with traditional methods, this avoids the uncertainty of setting the operating current based on experience, ensuring both treatment effectiveness and preventing energy waste caused by excessive operating current. Especially when the influent water quality fluctuates significantly, this calculation method can achieve precise adjustment of the operating current, ensuring that the control system always operates under optimal conditions.

[0014] In conjunction with some embodiments of the first aspect, in some embodiments, after step S103, inputting the average current efficiency into the preset current calculation formula to obtain the working current, and calculating the current density based on the working current and the cross-sectional area of ​​the anode plate, the method further includes: if the current density is greater than a preset value, adjusting the current density to the preset value and determining the reduction range of the current density; reducing the instantaneous influent flow rate based on the reduction range of the current density, and performing steps S105 and S105 thereafter.

[0015] By adopting the above technical solution, when the current density exceeds the preset value, the control system will automatically adjust the current density to a safe value (preset value) and correspondingly reduce the instantaneous water flow rate. This protection mechanism can effectively prevent the electrode material from being damaged by excessive current density, thus extending the service life of the equipment.

[0016] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes: obtaining the actual voltage between the anode plate and the cathode plate, and comparing the actual voltage with a standard voltage, wherein the standard voltage is the voltage measured when the cathode plate is free of scale; if the actual voltage is higher than the standard voltage by more than a preset second percentage, then injecting acid washing solution into the reactor through an acid washing water pump to clean the electrodes.

[0017] By adopting the above technical solution, the control system monitors the actual voltage between the electrodes in real time and compares it with the standard voltage. This allows for timely detection of electrode scaling and automatic initiation of the acid washing program for electrode cleaning. This automated scaling monitoring and cleaning mechanism avoids the lag and subjectivity of manual inspection and can promptly prevent increased energy consumption and decreased processing efficiency caused by electrode scaling.

[0018] In conjunction with some embodiments of the first aspect, in some embodiments, after step S105, which detects the effluent COD concentration after hydraulic retention time, the method further includes: if the effluent COD concentration is reduced by more than a preset third percentage compared to the standard effluent COD concentration, calculating the excess degree of COD treatment; reducing the current density according to the excess degree, and performing steps S104 and S104 thereafter.

[0019] By adopting the above technical solution, when the effluent COD concentration is significantly lower than the standard effluent COD concentration, the control system calculates the degree of excess COD treatment and correspondingly reduces the current density, thereby avoiding energy waste caused by over-treatment and optimizing system operating costs. Especially when the influent water quality is good, timely reduction of treatment intensity not only saves energy but also reduces the generation of byproducts. Through this adaptive adjustment method, the control system achieves a dynamic balance between treatment effect and energy consumption, greatly improving operational economy.

[0020] In a second aspect, embodiments of this application provide a control system comprising: one or more processors and a memory; the memory is coupled to the one or more processors and is used to store computer program code, the computer program code including computer instructions, wherein the one or more processors invoke the computer instructions to cause the control system to perform the method described in the first aspect and any possible implementation thereof.

[0021] Thirdly, embodiments of this application provide a computer program product containing instructions that, when the computer program product is run on a control system, cause the control system to perform the method described in the first aspect and any possible implementation thereof.

[0022] Fourthly, embodiments of this application provide a computer-readable storage medium including instructions that, when executed on a control system, cause the control system to perform the method described in the first aspect and any possible implementation thereof.

[0023] Understandably, the control system provided in the second aspect, the computer program product provided in the third aspect, and the computer storage medium provided in the fourth aspect are all used to execute the methods provided in the embodiments of this application. Therefore, the beneficial effects they can achieve can be referred to the beneficial effects in the corresponding methods, and will not be repeated here.

[0024] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0025] 1. By adopting the above technical solution, the control system determines the allowable fluctuation range of COD based on the instantaneous influent COD concentration, then calculates the average current efficiency and uses it to determine the operating current, and then precisely controls the electrocatalytic oxidation process according to the current density and hydraulic retention time. This adaptive control method can respond promptly to changes in influent water quality, ensuring that the effluent meets standards while avoiding energy waste. Compared with the traditional constant current density control mode, it has higher treatment efficiency and better economy. When the effluent exceeds the standard, the control system automatically adjusts the average current efficiency and re-executes the control process, thus forming a closed-loop control.

[0026] 2. By adopting the above technical solution, the control system calculates the rate of change of influent flow rate between two consecutive detections. When the rate of change of influent flow rate exceeds a preset threshold, the operating current is adjusted accordingly. This allows the electrocatalytic oxidation process to quickly adapt to fluctuations in water volume, significantly improving the control system's adaptability to changes in hydraulic load and avoiding the low treatment efficiency problem caused by relying solely on adjusting the hydraulic residence time in traditional methods. Simultaneously, this dynamic adjustment method also helps maintain stable system operation and reduces the impact of sudden changes in water volume.

[0027] 3. By adopting the above technical solution, the control system monitors the actual voltage between the electrodes in real time and compares it with the standard voltage. This allows for timely detection of electrode scaling and automatic initiation of the acid washing program for electrode cleaning. This automated scaling monitoring and cleaning mechanism avoids the lag and subjectivity of manual inspection and can promptly prevent increased energy consumption and decreased processing efficiency caused by electrode scaling. Attached Figure Description

[0028] Figure 1 This is a schematic flowchart of an electrocatalytic oxidation control method in an embodiment of this application;

[0029] Figure 2 This is another schematic flowchart of the electrocatalytic oxidation control method in the embodiments of this application;

[0030] Figure 3 This is a schematic diagram of the physical device structure of a control system in an embodiment of this application. Detailed Implementation

[0031] The terminology used in the following embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. As used in the specification of this application, the singular expressions “a,” “an,” “the,” “the,” and “this” are intended to include the plural expressions as well, unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used in this application refers to any or all possible combinations including one or more of the listed items.

[0032] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as implying or suggesting relative importance or implicitly indicating the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature, and in the description of the embodiments of this application, unless otherwise stated, "multiple" means two or more.

[0033] The following describes the process of the method provided in this implementation. Please refer to [link / reference]. Figure 1 This is a schematic flowchart of an electrocatalytic oxidation control method in an embodiment of this application.

[0034] S101. Obtain the instantaneous influent flow rate and instantaneous influent COD concentration, and determine the allowable fluctuation range of COD based on the instantaneous influent COD concentration. The allowable fluctuation range of COD includes a preset amount of influent COD concentration.

[0035] The instantaneous influent flow rate refers to the volumetric flow rate of industrial wastewater entering the electrocatalytic oxidation reactor per unit time, usually expressed in m³ / h; the instantaneous influent COD concentration is used to represent the real-time content of chemical oxygen demand in the influent, usually expressed in mg / L; the allowable fluctuation range of COD refers to the COD concentration range that fluctuates within a certain range (e.g., 1±10%) centered on the current instantaneous influent COD concentration; the preset quantity refers to the number of discrete influent COD concentration values ​​selected within the allowable fluctuation range of COD for subsequent calculations, usually 5-10 sample points; and the influent COD concentration refers to the specific COD concentration value selected within the allowable fluctuation range of COD.

[0036] The control system executes this step at preset time intervals when starting the electrocatalytic oxidation process and during operation. Specifically, firstly, the control system collects the instantaneous influent flow rate through a flow meter and simultaneously obtains the instantaneous influent COD concentration through an online COD analyzer. Then, using the obtained instantaneous influent COD concentration as the center value, preset percentages (e.g., ±10%) are extended upwards and downwards to form a COD tolerance fluctuation range. Within this COD tolerance fluctuation range, the control system selects a preset number (e.g., 7) of influent COD concentration values ​​according to an equidistant principle. These selected influent COD concentration values ​​will be used for subsequent current efficiency calculations.

[0037] The following is a specific example. Assuming the instantaneous influent flow rate is 5.0 m³ / h and the instantaneous influent COD concentration is 500 mg / L, and a fluctuation range of ±10% is adopted, then the allowable fluctuation range of COD is: the upper limit is 500 × (1 + 10%) = 550 mg / L, and the lower limit is 500 × (1 - 10%) = 450 mg / L. Seven equally spaced influent COD concentration values ​​are selected. The distance between two adjacent influent COD concentration values ​​is calculated as: distance = (upper limit - lower limit) ÷ (number of sampling points - 1) = (550 - 450) ÷ (7 - 1) = 16.7 mg / L, resulting in: (1) 450 mg / L (lower limit);

[0038] (2) 466.7mg / L (450+16.7);

[0039] (3) 483.3mg / L (466.7+16.7);

[0040] (4) 500 mg / L (central value);

[0041] (5) 516.7mg / L (500+16.7);

[0042] (6) 533.3mg / L (516.7+16.7);

[0043] (7) 550 mg / L (upper limit);

[0044] These seven influent COD concentration values ​​will be input into the preset current efficiency calculation formula for subsequent current efficiency calculation steps.

[0045] S102. Input the COD concentration of each influent in the COD allowable fluctuation range into the preset current efficiency calculation formula to obtain the preset number of current efficiencies, and calculate the average current efficiency.

[0046] Among them, the preset current efficiency calculation formula is a mathematical expression used to calculate current efficiency, which includes multiple process parameters; current efficiency refers to the proportion of input electrical energy converted into energy that effectively degrades COD, expressed as a percentage; average current efficiency is the result obtained by calculating the arithmetic mean of the current efficiencies of a preset number; process parameters include physicochemical constants such as electron transfer number, Faraday constant, and oxygen molar mass.

[0047] The control system executes this step immediately after obtaining the discrete influent COD concentrations within the permissible COD fluctuation range. Specifically, the control system substitutes each selected influent COD concentration value into a preset current efficiency calculation formula, which is as follows: =(CODin-CODout)×n×F×Qin / (M O2 ×Iin-out); where, The values ​​represent current efficiency, CODin represents the instantaneous influent COD concentration, CODout represents the instantaneous effluent COD concentration, n represents the stoichiometric coefficient of electron transfer, F represents the Faraday constant, Qin represents the instantaneous influent flow rate, and M... O2 The value represents the molar mass of oxygen. Iin-out represents the current value corresponding to the instantaneous influent COD concentration and the instantaneous effluent COD concentration. The instantaneous effluent COD concentration refers to the effluent COD concentration measured at the same moment as the instantaneous influent COD concentration.

[0048] Assume that at time T, the control system acquires the instantaneous influent COD concentration entering the electrocatalytic oxidation reactor and simultaneously collects the instantaneous effluent COD concentration exiting the reactor. The control system queries the mapping relationship between the influent COD concentration, the effluent COD concentration, and the current value to determine the current value under the combination of the instantaneous influent COD concentration and the instantaneous effluent COD concentration.

[0049] For each influent COD concentration, the control system can calculate a corresponding current efficiency (continuing from the example in step S101, there are 7 influent COD concentrations, so there are also 7 current efficiencies). Finally, the control system performs an arithmetic average of these current efficiencies to obtain the average current efficiency, which is used for subsequent operating current calculations.

[0050] It should be noted that only influent COD concentrations and effluent COD concentrations that have occurred in the historical operating data will have corresponding current values. If a combination of influent and effluent COD concentrations does not exist in the historical operating data, then the instantaneous influent COD concentration with the smallest difference from that influent COD concentration in the historical operating data will be selected to replace that value. Continuing with the example in step S101, seven equally spaced influent COD concentration values ​​are selected as follows:

[0051] (1) 450 mg / L (lower limit);

[0052] (2) 466.7mg / L (450+16.7);

[0053] (3) 483.3mg / L (466.7+16.7);

[0054] (4) 500 mg / L (central value);

[0055] (5) 516.7mg / L (500+16.7);

[0056] (6) 533.3mg / L (516.7+16.7);

[0057] (7) 550 mg / L (upper limit);

[0058] If the influent COD concentration value at the third sampling point (483.3 mg / L) is not in the historical operating data, but the influent COD concentration at a certain instant in the historical operating data (e.g., 479.5 mg / L) is the smallest difference from this influent COD concentration value, then the influent COD concentration value is changed to 479.5 mg / L.

[0059] S103. Input the average current efficiency into the preset current calculation formula to obtain the working current, and calculate the current density based on the working current and the cross-sectional area of ​​the anode plate.

[0060] Among them, the preset current calculation formula refers to the mathematical expression used to calculate the required working current; the working current is used to represent the actual current applied to the electrode, usually in amperes (A); the anode plate cross-sectional area refers to the effective area of ​​the anode plate in contact with industrial wastewater, usually in square meters (m²); and the current density refers to the current on a unit electrode area, usually in A / m².

[0061] The control system executes this step immediately after obtaining the average current efficiency. Specifically, the control system substitutes the calculated average current efficiency into a preset current calculation formula, which is: I = (CODin - CODstandard_out) × n × F × Qin / (M O2 × Where I represents the operating current, CODin represents the instantaneous influent COD concentration, CODstandard_out represents the standard effluent COD concentration, n represents the stoichiometric coefficient of electron transfer, F represents the Faraday constant, Qin represents the instantaneous influent flow rate, and M... O2 This indicates the molar mass of oxygen. This indicates the average current efficiency.

[0062] After calculating the operating current, the control system uses the cross-sectional area of ​​the anode plate to divide the operating current by the cross-sectional area of ​​the anode plate to obtain the current density.

[0063] S104. If the current density is less than or equal to the preset value, the ratio of the effective reaction volume of the reactor to the instantaneous influent flow rate shall be determined as the hydraulic residence time.

[0064] Among them, the preset value refers to the upper limit of the current density determined according to the characteristics of the electrode material and the process requirements, which is usually 50-100A / m²; the effective reaction volume of the reactor is used to represent the actual liquid phase space volume participating in the reaction in the electrocatalytic oxidation reactor, which is usually expressed in cubic meters (m³); the hydraulic retention time refers to the theoretical residence time of industrial wastewater in the electrocatalytic oxidation reactor, which is usually expressed in hours (h).

[0065] The control system executes this step immediately after determining the current density. Specifically, the control system compares the calculated current density with a preset value. When the current density is less than or equal to the preset value, it indicates that the electrode material is within the safe operating range under the current conditions. The control system then divides the pre-calibrated effective reaction volume of the reactor (e.g., 5 m³) by the instantaneous influent flow rate (e.g., 2 m³ / h) to calculate the hydraulic retention time (2.5 h in this example). This hydraulic retention time will serve as an important basis for subsequent process parameter adjustments and effluent water quality control.

[0066] S105. Detect the COD concentration of the effluent after hydraulic retention time;

[0067] Among them, the effluent COD concentration refers to the chemical oxygen demand content in industrial wastewater after electrocatalytic oxidation treatment, usually expressed in mg / L; detection refers to the process of obtaining effluent water quality data through an online COD analyzer; hydraulic retention time is used to indicate the time point after the theoretical treatment time.

[0068] The control system executes this step after the industrial wastewater has undergone the full hydraulic retention time. Specifically, the control system uses an online COD analyzer installed on the effluent pipeline to collect effluent samples and analyze their COD concentration after the industrial wastewater has undergone the hydraulic retention time, thus obtaining the effluent COD concentration.

[0069] S106. If the COD concentration of the effluent is greater than the standard COD concentration of the effluent, adjust the average current efficiency to the minimum current efficiency and repeat steps S103 and S103.

[0070] Among them, the standard effluent COD concentration refers to the target value for effluent water quality control determined according to environmental protection requirements or process requirements, usually expressed in mg / L; the minimum current efficiency refers to the lowest current efficiency in historical operating data, used for conservative estimation; re-execution refers to the process of repeating specific steps with new parameters.

[0071] The control system executes this step immediately after obtaining valid effluent COD concentration detection results. Specifically, the control system compares the effluent COD concentration with the preset standard effluent COD concentration. When the effluent COD concentration is greater than the standard effluent COD concentration, the control system will abandon the previously calculated average current efficiency and instead use the minimum current efficiency from historical operating data (e.g., 60%) in the preset current calculation formula. This yields a larger operating current, thereby enhancing the treatment intensity. Then, the control system re-executes subsequent steps such as current density calculation and hydraulic retention time determination until the effluent meets the treatment requirements. If the standard still cannot be met after multiple adjustments, the control system will issue an alarm, prompting operators to check the equipment status or adjust the influent load.

[0072] By adopting the above technical solution, the control system determines the allowable fluctuation range of COD based on the instantaneous influent COD concentration, then calculates the average current efficiency and uses it to determine the operating current, and then precisely controls the electrocatalytic oxidation process according to the current density and hydraulic retention time. This adaptive control method can respond promptly to changes in influent water quality, ensuring that the effluent meets standards while avoiding energy waste. Compared with the traditional constant current density control mode, it has higher treatment efficiency and better economy. When the effluent exceeds the standard, the control system automatically adjusts the average current efficiency and re-executes the control process, thus forming a closed-loop control.

[0073] The following provides a more detailed description of the process of the method provided in this implementation. Please refer to [link / reference]. Figure 2 This is another schematic diagram of the electrocatalytic oxidation control method in the embodiments of this application.

[0074] S201. Obtain the instantaneous influent flow rate and instantaneous influent COD concentration, and determine the allowable fluctuation range of COD based on the instantaneous influent COD concentration. The allowable fluctuation range of COD includes a preset amount of influent COD concentration.

[0075] For details, please refer to step S101, which will not be repeated here.

[0076] S202. Input the COD concentration of each influent in the COD allowable fluctuation range into the preset current efficiency calculation formula to obtain the preset number of current efficiencies, and calculate the average current efficiency.

[0077] For details, please refer to step S102, which will not be repeated here.

[0078] S203. Input the average current efficiency into the preset current calculation formula to obtain the working current. Calculate the current density based on the working current and the cross-sectional area of ​​the anode plate.

[0079] For details, please refer to step S103, which will not be repeated here.

[0080] S204. Obtain the influent flow rate of two adjacent detections and calculate the rate of change of influent flow rate between the two adjacent detections.

[0081] Among them, two consecutive detections refer to two consecutive data acquisitions performed at a preset time interval (usually 5-15 minutes); the influent flow rate refers to the volumetric flow rate of industrial wastewater entering the electrocatalytic oxidation reactor per unit time, usually expressed in m³ / h; the flow rate change rate refers to the ratio of the difference in influent flow rate between two consecutive detections to the previous influent flow rate, expressed as a percentage.

[0082] The control system executes this step at preset time intervals when starting the electrocatalytic oxidation process and during operation. Specifically, the control system records the influent flow rate every preset time interval (e.g., 10 minutes) using a flow meter installed on the influent pipe. The control system compares the latest acquired flow rate data (Qt) with the previously recorded flow rate data (Qt-1) and calculates the influent flow rate change rate using the formula (Qt-Qt-1) / Qt-1×100%. To reduce the impact of instantaneous fluctuations, the control system smooths the influent flow rate change rate calculated multiple times (e.g., 3 times) to obtain more stable trend data.

[0083] S205. If the inlet flow rate change rate shows that the inlet flow rate increases by more than the preset first percentage, the operating current is increased according to the inlet flow rate change rate, and the current density is calculated based on the operating current and the cross-sectional area of ​​the anode plate.

[0084] S206. If the inlet flow rate change rate shows that the inlet flow rate has decreased by more than a preset first percentage, the operating current is reduced according to the inlet flow rate change rate, and the current density is calculated based on the operating current and the cross-sectional area of ​​the anode plate.

[0085] If the inlet flow rate change rate shows that the inlet flow rate increases / decreases by more than a preset first percentage, the operating current is increased / decreased according to the inlet flow rate change rate, and the current density is calculated based on the operating current and the cross-sectional area of ​​the anode plate.

[0086] Among them, the preset first percentage refers to the threshold of the change in influent flow rate that triggers the adjustment of the working current, which is usually set to ±10%; the working current adjustment refers to the process of adjusting the working current according to the proportion of the change in influent flow rate; the anode plate cross-sectional area remains unchanged, which is an inherent parameter of the electrocatalytic oxidation reactor.

[0087] The control system executes these two steps immediately upon obtaining the rate of change of the influent flow rate. Specifically, the control system compares the calculated rate of change of the influent flow rate with a preset first percentage (e.g., ±15%). When the rate of change of the influent flow rate increases and exceeds the preset first percentage, the control system increases the operating current using the following formula: New operating current = Original operating current × (1 + Rate of change of influent flow rate). When the rate of change of the influent flow rate decreases and exceeds the preset first percentage, the control system correspondingly decreases the operating current. The adjusted operating current is divided by the anode plate cross-sectional area to obtain the new current density. If the rate of change of the influent flow rate is within the preset first percentage range, the original operating current remains unchanged.

[0088] S207. If the current density is greater than the preset value, adjust the current density to the preset value and determine the reduction range of the current density; reduce the instantaneous influent flow rate according to the reduction range of the current density.

[0089] The reduction in current density refers to the ratio of the required reduction in current density to the original current density. The control system executes this step immediately after calculating the new current density. Specifically, the control system compares the calculated current density with a preset value (e.g., 80 A / m²). When the current density exceeds the preset value, the control system forcibly adjusts the current density to the preset value and calculates the reduction in current density (e.g., from 100 A / m² to the preset value of 80 A / m², the reduction in current density is 20%). Then, the control system proportionally reduces the instantaneous inlet flow rate according to the reduction in current density (e.g., the instantaneous inlet flow rate is also reduced by 20%), achieved by adjusting the inlet pump speed or the inlet valve opening.

[0090] S208. If the current density is less than or equal to the preset value, the ratio of the effective reaction volume of the reactor to the instantaneous influent flow rate shall be determined as the hydraulic residence time.

[0091] For details, please refer to step S104, which will not be repeated here.

[0092] S209. Detect the COD concentration of the effluent after hydraulic retention time.

[0093] For details, please refer to step S105, which will not be repeated here.

[0094] S210. If the COD concentration of the effluent is reduced by more than the third preset percentage compared with the standard effluent COD concentration, calculate the excess degree of COD treatment; reduce the current density according to the excess degree, and execute S209 and the steps after S209.

[0095] The standard effluent COD concentration refers to the target value for effluent water quality control determined according to environmental protection requirements or process requirements, usually expressed in mg / L; the preset third percentage is used to indicate the threshold for judging excessive effluent water quality, usually set at 20-30%; the degree of excess COD treatment refers to the extent to which the effluent COD concentration is lower than the standard effluent COD concentration, expressed as a percentage.

[0096] The control system executes this step immediately after obtaining a valid effluent COD concentration detection result. Specifically, the control system compares the detected effluent COD concentration with the standard effluent COD concentration (e.g., the standard effluent COD concentration is 50 mg / L, and the actual effluent COD concentration is 35 mg / L). When the actual effluent COD concentration is more than a preset third percentage (e.g., 30%) lower than the standard effluent COD concentration, the control system calculates the excess degree of COD treatment: Excess degree = (Standard effluent COD concentration - Actual effluent COD concentration) / Standard effluent COD concentration × 100% (30% in this example). Then, the control system uses the calculated excess degree as the reduction rate of the operating current and recalculates the current density. After reducing the current density, the control system continues to execute subsequent steps such as effluent COD detection until the effluent indicators are maintained within a reasonable range. If the effluent indicators are still significantly lower than the standard value after multiple adjustments, the control system will record the operating parameters for further optimization of process parameters.

[0097] S211. If the COD concentration of the effluent is greater than the standard COD concentration of the effluent, adjust the average current efficiency to the minimum current efficiency and repeat steps S203 and S203.

[0098] For details, please refer to step S106, which will not be repeated here.

[0099] S212. Obtain the actual voltage between the anode plate and the cathode plate, and compare the actual voltage with the standard voltage, which is the voltage measured when the cathode plate is free of scale.

[0100] In this context, the anode plate refers to the positive electrode plate in the electrocatalytic oxidation reactor, used to generate oxidizing substances; the cathode plate refers to the negative electrode plate in the electrocatalytic oxidation reactor, used for reduction reactions; the actual voltage refers to the potential difference between the anode and cathode measured during operation, usually in volts (V); the standard voltage refers to the reference voltage value when the electrode surface is clean and free of scale; scale refers to inorganic substances such as calcium and magnesium salts deposited on the electrode surface; and voltage detection refers to the process of real-time monitoring of the voltage between the electrodes using a voltage sensor.

[0101] The control system executes this step at preset time intervals when starting the electrocatalytic oxidation process and during operation. Specifically, the control system continuously collects voltage data between the electrodes using voltage sensors installed between the electrode plates. The control system compares the collected actual voltage with a pre-stored standard voltage (e.g., 4.5V under normal operating conditions). To avoid the influence of instantaneous fluctuations, the control system collects multiple sets of data within a certain time window (e.g., 15 minutes) and calculates the average value as the current actual voltage. Simultaneously, the control system records voltage change trends to predict the development of scaling.

[0102] S213. If the actual voltage is more than a preset second percentage higher than the standard voltage, then the pickling solution is injected into the reactor by the pickling water pump to clean the electrodes.

[0103] The preset second percentage refers to the voltage rise threshold that triggers electrode cleaning, which is usually set to 15-25%; the pickling water pump is a special metering pump used to deliver pickling solution; the pickling solution refers to the acidic cleaning solution used to remove scale from electrodes, usually a dilute hydrochloric acid or citric acid solution; electrode cleaning refers to the process of removing scale from the electrode surface through chemical methods.

[0104] The control system executes this step when it detects an abnormal voltage increase. Specifically, when the control system detects that the actual voltage has increased by more than a preset second percentage (e.g., 20%, meaning the voltage rises from 4.5V to above 5.4V), it initiates the automatic cleaning program. First, the control system controls the inlet water pump to reduce the inlet water flow or suspend inlet water supply, while simultaneously starting the acid pickling water pump to inject acid pickling solution into the reactor according to the preset addition amount (e.g., 10L of 5% hydrochloric acid per cubic meter of reactor volume). The control system keeps the electrodes energized and maintains a certain stirring intensity to ensure that the acid pickling solution fully contacts the scale. After the cleaning process continues for a preset duration (e.g., 30 minutes), the control system discharges the acid pickling waste liquid and rinses the electrodes with clean water. If the voltage still does not drop to the normal range after one cleaning, the control system will repeat the cleaning process or issue a manual inspection prompt.

[0105] The control system in the embodiments of this invention is described below from the perspective of hardware processing. Please refer to [link / reference needed]. Figure 3 This is a schematic diagram of the physical device structure of the control system in an embodiment of this application.

[0106] It should be noted that, Figure 3 The structure of the control system shown is merely an example and should not impose any limitation on the functionality and scope of use of the embodiments of the present invention.

[0107] like Figure 3As shown, the control system includes a CPU 301, which can perform various appropriate actions and processes based on a program stored in the read-only memory ROM 302 or a program loaded from the storage section 308 into the random access memory RAM 303, such as executing the methods described in the above embodiments. The RAM 303 also stores various programs and data required for system operation. The CPU 301, ROM 302, and RAM 303 are interconnected via a bus 304. An I / O interface 305 is also connected to the bus 304.

[0108] The following components are connected to I / O interface 305: input section 306 including audio input devices, push-button switches, etc.; output section 307 including a liquid crystal display (LCD) and audio output devices, indicator lights, etc.; storage section 308 including a hard disk, etc.; and communication section 309 including a network interface card such as a LAN (Local Area Network) card, modem, etc. Communication section 309 performs communication processing via a network such as the Internet. Drive 310 is also connected to I / O interface 305 as needed. Removable media 311, such as a disk, optical disk, magneto-optical disk, semiconductor memory, etc., are installed on drive 310 as needed so that computer programs read from them can be installed into storage section 308 as needed.

[0109] In particular, according to embodiments of the present invention, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments of the present invention include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing computer programs for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via communication section 309, and / or installed from removable medium 311. When the computer program is executed by CPU 301, it performs the various functions defined in the present invention.

[0110] It should be noted that specific examples of computer-readable storage media may include, but are not limited to: electrical connections having one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), flash memory, optical fiber, portable compact disc read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. In this invention, a computer-readable storage medium can be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device.

[0111] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of the present invention. Each block in a flowchart or block diagram may represent a module, program segment, or portion of code, which contains one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those shown in the drawings.

[0112] Specifically, the control system of this embodiment includes a processor and a memory. The memory stores a computer program, and when the computer program is executed by the processor, it implements the electrocatalytic oxidation control method provided in the above embodiment.

[0113] In another aspect, the present invention also provides a computer-readable storage medium, which may be included in the control system described in the above embodiments; or it may exist independently and not incorporated into the control system. The storage medium carries one or more computer programs that, when executed by a processor of the control system, cause the control system to implement the electrocatalytic oxidation control method provided in the above embodiments.

[0114] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

[0115] As used in the above embodiments, depending on the context, the term "when..." can be interpreted as meaning "if...", "after...", "in response to determining...", or "in response to detecting...". Similarly, depending on the context, the phrase "when determining..." or "if (the stated condition or event) is interpreted as meaning "if determining...", "in response to determining...", "when (the stated condition or event) is detected", or "in response to detecting (the stated condition or event)".

[0116] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. This program can be stored in a computer-readable storage medium, and when executed, it can include the processes described in the above method embodiments. The aforementioned storage medium includes various media capable of storing program code, such as ROM or random access memory (RAM), magnetic disks, or optical disks.

Claims

1. A method for controlling electrocatalytic oxidation, characterized in that, Applied to a control system, the method includes: S101. Obtain the instantaneous influent flow rate and instantaneous influent COD concentration, and determine the allowable fluctuation range of COD based on the instantaneous influent COD concentration, wherein the allowable fluctuation range of COD includes a preset amount of influent COD concentration. S102. Input the COD concentration of each influent in the COD allowable fluctuation range into the preset current efficiency calculation formula to obtain the preset number of current efficiencies, and calculate the average current efficiency. S103. Input the average current efficiency into the preset current calculation formula to obtain the working current, and calculate the current density based on the working current and the cross-sectional area of ​​the anode plate. S104. If the current density is less than or equal to a preset value, the ratio of the effective reaction volume of the reactor to the instantaneous influent flow rate is determined as the hydraulic residence time. S105. Detect the COD concentration of the effluent after the hydraulic retention time; S106. If the COD concentration of the effluent is greater than the standard COD concentration of the effluent, adjust the average current efficiency to the minimum current efficiency and repeat steps S103 and S103.

2. The method according to claim 1, characterized in that, After step S101, which involves acquiring the instantaneous influent flow rate and instantaneous influent COD concentration, and determining the allowable COD fluctuation range based on the instantaneous influent COD concentration, wherein the allowable COD fluctuation range includes a preset amount of influent COD concentration, the method further includes: Obtain the influent flow rate of two consecutive measurements and calculate the rate of change of influent flow rate between the two consecutive measurements; If the influent flow rate change rate shows that the influent flow rate increases by more than a preset first percentage, the operating current is increased according to the influent flow rate change rate, and the steps in S103, which calculate the current density based on the operating current and the cross-sectional area of ​​the anode plate, and subsequent steps are executed. If the rate of change of the influent flow rate shows that the influent flow rate has decreased by more than a preset first percentage, the operating current is reduced according to the rate of change of the influent flow rate, and the steps in S103, which calculate the current density based on the operating current and the cross-sectional area of ​​the anode plate, and subsequent steps are executed.

3. The method according to claim 1, characterized in that, The preset current efficiency calculation formula is as follows: ; in, The values ​​represent current efficiency, CODin and CODout, n and F respectively. The influent COD concentration is represented by CODin, CODout by CODout, n by the stoichiometric coefficient of electron transfer, F by Faraday constant, and Qin by the influent flow rate. O2 The value represents the molar mass of oxygen. Iin-out represents the current value corresponding to the instantaneous influent COD concentration and the instantaneous effluent COD concentration. The instantaneous effluent COD concentration refers to the effluent COD concentration measured at the same moment as the instantaneous influent COD concentration.

4. The method according to claim 1, characterized in that, The preset current calculation formula is as follows: ; Where I represents the operating current, CODin represents the instantaneous influent COD concentration, CODstandard_out represents the standard effluent COD concentration, n represents the stoichiometric coefficient of electron transfer, F represents the Faraday constant, Qin represents the instantaneous influent flow rate, and M... O2 This indicates the molar mass of oxygen. This indicates the average current efficiency.

5. The method according to claim 1, characterized in that, After step S103, in which the average current efficiency is input into a preset current calculation formula to obtain the operating current, and the current density is calculated based on the operating current and the anode plate cross-sectional area, the method further includes: If the current density is greater than the preset value, the current density is adjusted to the preset value, and the reduction in current density is determined. Based on the decrease in current density, reduce the instantaneous influent flow rate and execute steps S105 and S105 thereafter.

6. The method according to claim 1, characterized in that, The method further includes: Obtain the actual voltage between the anode plate and the cathode plate, and compare the actual voltage with a standard voltage, which is the voltage measured when the cathode plate is free of scale. If the actual voltage is higher than the standard voltage by a preset second percentage or more, then the acid washing solution is injected into the reactor by the acid washing water pump to clean the electrodes.

7. The method according to claim 1, characterized in that, After step S105, which involves detecting the effluent COD concentration after the hydraulic retention time, the method further includes: If the COD concentration of the effluent is reduced by more than a preset third percentage compared to the COD concentration of the standard effluent, the degree of excess COD treatment is calculated. The current density is reduced according to the degree of excess, and steps S104 and S104 thereafter are performed.

8. A control system, characterized in that, The control system includes: one or more processors and a memory; the memory is coupled to the one or more processors, the memory is used to store computer program code, the computer program code including computer instructions, and the one or more processors call the computer instructions to cause the control system to perform the method as described in any one of claims 1-7.

9. A computer-readable storage medium comprising instructions, characterized in that, When the instruction is executed on the control system, it causes the control system to perform the method as described in any one of claims 1-7.

10. A computer program product, characterized in that, When the computer program product is run on the control system, the control system performs the method as described in any one of claims 1-7.

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