A purification device for multi-stage treatment of wastewater

Abstract

The present invention relates to the technical field of wastewater treatment, and in particular to a purification device for multi-stage treatment of wastewater. The present invention adds a buffer unit to the purification device, analyzes the working state and processing capacity attenuation characteristics of the processing unit in real time through a control unit, and combines the pressure effect of the dilution operation on the post-processing unit to accurately control the water outlet valve and the water injection valve of the buffer unit, and adjusts the working state of the processing unit in real time, so that the purification device can adapt to the complex changes of wastewater, and make full use of the processing performance of the purification device, prevent the purification device from being overloaded and affecting the purification effect, balance the purification efficiency and purification effect of the purification device, and ensure the smooth operation of the purification device.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater treatment, and in particular to a purification device for multi-stage treatment of wastewater. Background Art

[0002] Multi-stage wastewater treatment devices are a common wastewater treatment method. Each unit in this type of device is responsible for removing specific pollutants in the wastewater or performing a specific treatment process, thereby gradually purifying the wastewater. This device is widely used in industrial, agricultural, domestic and municipal wastewater treatment.

[0003] Generally, the wastewater to be treated has multiple sources, including but not limited to households, commerce, industry, etc. Due to the diversity of sources, the pollutant concentration inside the wastewater is also relatively complex. Existing multi-stage wastewater treatment methods usually set the treatment intensity according to the capacity of the container, that is, regardless of the concentration of pollutants in the wastewater entering the equipment, the equipment is treated at the same treatment intensity. Therefore, when the concentration of pollutants in the wastewater entering the equipment is higher than the design capacity of the equipment, it may cause the treatment equipment to overload, thereby affecting the treatment effect. When the concentration of pollutants in the wastewater is lower than the design capacity, the system may operate in a non-optimal state or have excess performance, resulting in a waste of energy and resources. In addition, the treatment performance of the equipment is constantly changing, making it difficult to balance the effect and efficiency of multi-stage wastewater treatment. Summary of the invention

[0004] In order to solve the technical problem that it is difficult to balance the effect and efficiency of multi-stage wastewater treatment, the purpose of the present invention is to provide a multi-stage wastewater treatment purification device, and the technical solution adopted is as follows:

[0005] A purification device for multi-stage treatment of wastewater, comprising a purification device body, on which a treatment unit is installed; each of the treatment units treats a wastewater pollutant; the purification device is also equipped with a buffer unit in front of each of the treatment units; the buffer unit comprises a sensor module, a water injection valve and a water outlet valve; the sensor module is used to monitor the concentration of wastewater pollutants inside the buffer unit and the treatment unit and the water injection valve in real time, and monitor the water outlet flow of the water outlet valve; the water injection valve is used to dilute high-concentration wastewater; the water outlet valve is used to control the wastewater flow entering the next treatment unit; the control unit is used to receive data from the sensor module and control the water injection valve and the water outlet valve of the buffer unit; the control unit comprises an initial processing module, a correction processing module and a final control module;

[0006] Initial processing module: select any of the processing units as the target processing unit, and obtain the target buffer unit and the target pollutant concentration accordingly; obtain the real-time processing rate of the target processing unit according to the outlet flow rate of the target buffer unit and the target pollutant concentration, combined with the capacity of the target processing unit and the target pollutant concentration; obtain the initial flow control parameters and initial dilution parameters according to the difference between the real-time processing rate and the preset processing rate, combined with the outlet flow rate of the target buffer unit and the target pollutant concentration in the water injection valve;

[0007] A correction processing module: according to the change characteristics of the real-time processing rate, the capacity attenuation index of the target processing unit is obtained; according to the change characteristics of the capacity attenuation index, the initial flow control parameter and the initial dilution parameter are combined to obtain a correction flow control parameter and a correction dilution parameter;

[0008] Final control module: based on the change of the target pollutant concentration of all the processing units, the processing time and the attenuation characteristics of the processing capacity, combined with the corrected dilution parameters of the target processing unit, obtain the final dilution parameters of the target processing unit; control the target pollutant concentration in the target buffer unit according to the final dilution parameters; control the water outlet valve of the target buffer unit according to the corrected flow control parameters.

[0009] Furthermore, the method for acquiring the real-time processing rate includes:

[0010] According to the capacity of the target treatment unit and the effluent flow rate at the current time point, the wastewater treatment time at the current time point is obtained; the capacity of the treatment unit is positively correlated with the wastewater treatment time; the effluent flow rate is negatively correlated with the wastewater treatment time;

[0011] The average value of the target pollutant concentration in the target buffer unit within the adjacent historical time of the wastewater treatment time at the current time point is taken as the input concentration; the difference between the target pollutant concentration in the target treatment unit at the current time point and the input concentration is taken as the target purification parameter at the current time point; according to the target purification parameter at the current time point and the wastewater treatment time, the real-time processing rate at the current time point is obtained; the target purification parameter is positively correlated with the real-time processing rate; and the wastewater treatment time is negatively correlated with the real-time processing rate.

[0012] Furthermore, the method for obtaining the initial flow control parameters includes:

[0013] According to the relative difference between the real-time processing rate at the current time point and the preset ideal processing rate of the target processing unit, obtaining a real-time processing difference parameter at the current time point;

[0014] According to the real-time processing difference parameters, the preset flow adjustment coefficient and the water outlet flow of the target buffer unit at the current time point, the initial flow control parameters of the target buffer unit at the current time point are obtained; the real-time processing difference parameters, the preset flow adjustment coefficient and the water outlet flow are positively correlated with the initial flow control parameters.

[0015] Furthermore, the method for obtaining the initial dilution parameter includes:

[0016] When the real-time processing difference parameter is greater than or equal to zero, or the target pollutant concentration in the water injection valve is greater than or equal to the target pollutant concentration in the target buffer unit, setting the initial dilution parameter to zero;

[0017] When the real-time processing difference parameter is less than zero and the target pollutant concentration in the water injection valve is less than the target pollutant concentration in the target buffer unit, the real-time processing difference parameter is negatively correlated and normalized as an initial dilution coefficient; the product of the target pollutant concentration in the target buffer unit and the initial dilution coefficient is used as the initial dilution parameter.

[0018] Furthermore, the method for obtaining the capability decay index includes:

[0019] Performing curve fitting on the real-time processing rate of the target processing unit at all time points to obtain a processing rate variation curve; obtaining an instantaneous slope of the processing rate of the target processing unit at a current time point;

[0020] The difference between the maximum value of the real-time processing rate of the target processing unit and the real-time processing rate at the current time point is used as the attenuation coefficient; according to the attenuation coefficient at the current time point, combined with the instantaneous slope of the processing rate at the current time point, the capacity attenuation index of the target processing unit at the current time point is obtained; the instantaneous slope of the processing rate is negatively correlated with the capacity attenuation index; the attenuation coefficient is positively correlated with the capacity attenuation index.

[0021] Furthermore, the method for obtaining the modified flow control parameters includes:

[0022] Normalize the difference between the capability decay index at the current time point and the capability decay index at the adjacent time point in history to obtain the correction coefficient at the current time point;

[0023] According to the initial flow control parameter at the current time point, the absolute value of the initial flow control parameter and the correction coefficient, the corrected flow control parameter of the target buffer unit at the current time point is obtained; the initial flow control parameter is positively correlated with the corrected flow control parameter; the absolute value of the initial flow control parameter and the correction coefficient are both negatively and positively correlated with the corrected flow control parameter.

[0024] Furthermore, the method for obtaining the modified dilution parameter includes:

[0025] According to the initial dilution parameter and the correction coefficient at the current time point, the corrected dilution parameter of the target buffer unit at the current time point is obtained; the initial dilution parameter and the correction coefficient are both positively correlated with the corrected dilution parameter.

[0026] Furthermore, the method for obtaining the final dilution parameter includes:

[0027] According to the attenuation coefficient of each treatment unit at the current time point, the corresponding target purification parameter and the wastewater treatment time, the treatment pressure rise index of each treatment unit at the current time point is obtained; the attenuation coefficient is positively correlated with the treatment pressure rise index; the target purification parameter and the wastewater treatment time are both negatively correlated with the treatment pressure rise index;

[0028] The buffer units downstream of the target processing unit are all referred to as buffer units to be analyzed. When the target pollutant concentration corresponding to the buffer unit to be analyzed is less than the corresponding pollutant concentration in the water injection port of the target buffer unit, the buffer unit to be analyzed is used as an influencing buffer unit. Among the processing units corresponding to all the influencing buffer units, the processing unit with the largest processing pressure rise index at the current time point is obtained as the influencing processing unit. According to the corrected dilution parameter of the target buffer unit and the processing pressure rise index of the influencing processing unit, the final dilution parameter of the target buffer unit at the current time point is obtained.

[0029] Furthermore, the method for obtaining the final dilution parameter of the target buffer unit at the current time point according to the modified dilution parameter of the target buffer unit and the processing pressure rise index affecting the processing unit includes:

[0030] The processing pressure rise index is also normalized; the difference between the constant 1 and the processing pressure rise index of the target processing unit is used as the influence correction coefficient; the product of the influence correction coefficient at the current time point and the corrected dilution parameter is used as the final dilution parameter of the target buffer unit at the current time point.

[0031] Furthermore, the method for controlling the target pollutant concentration in the target buffer unit according to the final dilution parameter includes:

[0032] Obtaining a difference between the target pollutant concentration in the target buffer unit and the final dilution parameter as a dilution target concentration;

[0033] When the dilution target concentration is greater than the target pollutant concentration in the water injection valve, controlling the water injection valve to dilute the target pollutant concentration in the target buffer unit to the dilution target concentration;

[0034] When the dilution target concentration is less than or equal to the target pollutant concentration in the water injection valve, and the target pollutant concentration in the water injection valve is less than the target pollutant concentration in the target buffer unit, controlling the water injection valve to dilute the target pollutant concentration in the target buffer unit to the target pollutant concentration in the water injection valve;

[0035] When the target pollutant concentration in the water injection valve is greater than or equal to the target pollutant concentration in the target buffer unit, no dilution is performed.

[0036] The present invention has the following beneficial effects:

[0037] The present invention adds a buffer unit to the purification device; firstly obtains the real-time processing rate of the target processing unit to cope with the complex changes in the pollutant concentration in the wastewater, and provides a basis for the subsequent acquisition of the initial flow control parameters and the initial dilution parameters; further timely compares the real-time processing rate with the preset processing rate, obtains the initial flow control parameters and the initial dilution parameters, and prepares for the subsequent acquisition of the adjustment parameters of the purification device, so as to ultimately improve the water purification effect and ensure the water purification efficiency; further analyzes the attenuation characteristics of the processing capacity of the target processing unit according to the change characteristics of the real-time processing rate, and corrects the initial flow control parameters and the initial dilution parameters from the perspective of the attenuation of the processing capacity of the target processing unit to improve the accuracy of the adjustment of the purification device; further analyzes the pressure effect of the dilution operation on the subsequent processing units according to the changes in the target pollutant concentrations of all processing units, the processing time and the attenuation characteristics of the processing capacity, adjusts the corrected dilution parameters of the target processing unit again, obtains the final dilution parameters of the target processing unit, improves the working stability of the purification device, and ensures the purification effect; finally controls the target pollutant concentration in the target buffer unit according to the final dilution parameter; and controls the outlet valve of the target buffer unit according to the corrected flow control parameter. The present invention adds a buffer unit to the purification device, analyzes the working status of the processing unit and the processing capacity attenuation characteristics in real time through a control unit, and combines the pressure impact of the dilution operation on the post-processing unit to accurately control the water outlet valve and the water injection valve of the buffer unit, and adjusts the working status of the processing unit in real time, so that the purification device can adapt to the complex changes of wastewater, fully utilize the processing performance of the purification device, balance the purification efficiency and purification effect of the purification device, and ensure the smooth operation of the purification device. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions and advantages in the embodiments of the present invention or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0039] Figure 1 A schematic diagram of a multi-stage wastewater purification device provided by an embodiment of the present invention;

[0040] Figure 2 A schematic diagram of a buffer unit provided by an embodiment of the present invention;

[0041] Figure 3 A structural block diagram of a control unit provided by an embodiment of the present invention.

[0042] The numbers in the figure are: 1. platform; 2. bracket; 3. anoxic box; 4. aerobic box; 5. chemical box; 6. filter box; 7. water inlet box; 8. U-shaped pipe; 9. filter screen; 10. partition plate; 11. pressure relief valve; 12. ramp block; 13. outlet pipe; 14. PH tester; 15. activated carbon filter screen; 16. buffer unit; 17. water injection valve for dilution. DETAILED DESCRIPTION

[0043] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following is a detailed description of the specific implementation, structure, features and effects of a multi-stage wastewater treatment purification device proposed by the present invention in combination with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "another embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures or characteristics in one or more embodiments may be combined in any suitable form.

[0044] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

[0045] The specific scheme of the multi-stage wastewater treatment purification device provided by the present invention is described in detail below with reference to the accompanying drawings.

[0046] A purification device for multi-stage treatment of wastewater according to an embodiment of the present invention comprises a purification device body, on which treatment units are installed, each treatment unit treating a type of wastewater pollutant; the purification device also comprises a buffer unit installed in front of each treatment unit; the buffer unit comprises a sensor module, a water injection valve and a water outlet valve; the sensor module is used to monitor in real time the concentration of wastewater pollutants inside the buffer unit and the treatment unit and the water injection valve, and to monitor the water outlet flow of the water outlet valve; the water injection valve is used to dilute high-concentration wastewater; the water outlet valve is used to control the wastewater flow entering the next treatment unit; the control unit is used to receive data from the sensor module and control the water injection valve and the water outlet valve of the buffer unit.

[0047] See also Figure 1 , which shows a schematic diagram of a multi-stage wastewater treatment purification device provided by an embodiment of the present invention; please refer to Figure 2 , which shows a schematic diagram of a buffer unit provided by an embodiment of the present invention; Figure 1 and Figure 2 The device parts indicated by the serial numbers are: 1. Platform; 2. Bracket; 3. Anoxic box; 4. Aerobic box; 5. Chemical box; 6. Filter box; 7. Water inlet box; 8. U-shaped pipe; 9. Filter screen; 10. Partition plate; 11. Pressure relief valve; 12. Slope block; 13. Water outlet pipe; 14. PH tester; 15. Activated carbon filter screen; 16. Buffer unit; 17. Water injection valve for dilution.

[0048] In the embodiment of the present invention, the purification device is placed on the platform 1, and the partial structure of the device is supported by the bracket 2; the anoxic box 3, the aerobic box 4 and the chemical box 5 are all processing units for purifying wastewater; the filter box 6 is used to absorb residual impurities in the wastewater and purify the wastewater; a buffer unit 16 is installed in front of the processing unit, and the buffer unit and the processing unit are connected through the outlet pipe 13; the wastewater flows into the water inlet box 7 through the outlet pipe 13, and after being filtered by the filter screen 9, it flows through the U-shaped pipe 8 into the processing unit; the partition plate 10 is installed in the anoxic box, and the anoxic box 3 is connected. It is divided into two parts, and the newly entering wastewater will not affect the treated sewage in the upper layer of the right space; the pressure relief valve 11 is used to release gas to prevent excessive pressure; the slope block 12 is used to optimize the sedimentation effect and prevent sediment from entering the outlet pipe 13; the PH tester 14 is installed in the chemical box 5 to monitor the pH value of the wastewater in real time to ensure the accuracy of the chemical treatment; the activated carbon filter 15 is installed in the filter box 6 to absorb residual impurities in the wastewater; the dilution water injection valve 17 is used to dilute the high-concentration wastewater in the buffer unit.

[0049] Among them, the buffer unit also includes an outlet valve installed at the outlet pipe 13, which is used to control the flow of wastewater entering the next treatment unit; and includes a sensor module, which is used to monitor the concentration of wastewater pollutants inside the buffer unit and the treatment unit and the water injection valve 17 in real time, and monitor the outlet flow of the outlet valve, providing a data basis for the control unit.

[0050] In an embodiment of the present invention, each device part of the purification device is first debugged, which may include purification raw material preparation, internal temperature debugging of the processing unit, tightness test of water pipe connection, sensor working status test, signal transmission environment detection, etc.

[0051] It should be noted that, in one embodiment of the present invention, the sampling frequency of all sensors is set to 10 Hz, and data is collected simultaneously. After the sensors collect the required data, the data is preprocessed such as data cleaning, and the processed collected data is transmitted to the control unit. In other embodiments of the present invention, the implementer may also set other sampling frequencies.

[0052] See also Figure 3 , which shows a structural block diagram of a control unit provided by an embodiment of the present invention. The control unit includes an initial processing module 101, a correction processing module 102 and a final control module 103.

[0053] Initial processing module 101: select any processing unit as the target processing unit, and obtain the target buffer unit and the target pollutant concentration accordingly; obtain the real-time processing rate of the target processing unit according to the outlet flow rate and the target pollutant concentration of the target buffer unit, combined with the capacity and the target pollutant concentration of the target processing unit; obtain the initial flow control parameters and the initial dilution parameters according to the difference between the real-time processing rate and the preset processing rate, combined with the outlet flow rate of the target buffer unit and the target pollutant concentration in the water injection valve 17.

[0054] First, any processing unit is selected as the target processing unit, and the corresponding target buffer unit is obtained. Since each processing unit processes a wastewater pollutant, the target pollutant is obtained accordingly. The control method of each buffer unit 16 is consistent, and only one is used as an example here, and no further description is given.

[0055] It should be noted that the buffer unit 16 corresponds to the processing unit, and the buffer unit 16 is installed in front of the corresponding processing unit to play a buffering and regulating role for the processing unit. Figure 1 The buffer unit 16 and the anoxic box 3 are included.

[0056] Taking into account the complexity of the source of wastewater, the concentration of target pollutants in wastewater is difficult to remain unchanged, and the treatment rate of the target treatment unit will also change. In order to accurately control the target buffer unit, it is necessary to evaluate the real-time treatment rate of the target treatment unit; considering that the capacity of the target treatment unit and the effluent flow rate of the target buffer unit limit the treatment time of unit pollutants, the change in the concentration of target pollutants reflects the degree of purification of unit pollutants, so according to the effluent flow rate and target pollutant concentration of the target buffer unit, combined with the capacity and target pollutant concentration of the target treatment unit, the real-time treatment rate of the target treatment unit is obtained.

[0057] Preferably, in one embodiment of the present invention, considering that the larger the capacity of the target treatment unit is, the smaller the current effluent flow rate is, indicating that the wastewater stays in the target treatment unit for a longer time, the wastewater treatment time at the current time point is obtained according to the capacity of the target treatment unit and the effluent flow rate at the current time point; the capacity of the treatment unit is positively correlated with the wastewater treatment time; the effluent flow rate is negatively correlated with the wastewater treatment time;

[0058] Considering that the pollutant concentration in wastewater may fluctuate greatly in a short period of time due to various reasons, such as fluctuations in wastewater flow, mixing of wastewater from different sources, etc., if the instantaneous concentration at a certain moment is directly used as the input concentration, it may not reflect the overall pollution situation of the wastewater, which may easily lead to overreaction of the control system or inaccurate adjustment. Therefore, the average value of the target pollutant concentration in the target buffer unit within the adjacent historical time of the wastewater treatment time at the current time point is used as the input concentration; the difference between the target pollutant concentration in the target treatment unit at the current time point and the input concentration is used as the target purification parameter at the current time point; according to the target purification parameter at the current time point and the wastewater treatment time, the real-time treatment rate at the current time point is obtained; the target purification parameter is positively correlated with the real-time treatment rate; the wastewater treatment time is negatively correlated with the real-time treatment rate.

[0059] As an example, the correlation between parameters is expressed in the form of a ratio, the numerator is positively correlated with the ratio, and the denominator is negatively correlated with the ratio; the ratio of the capacity of the target treatment unit and the current outlet flow rate is used as the current wastewater treatment time; the ratio of the current target purification parameter to the wastewater treatment time is used as the current real-time processing rate.

[0060] Among them, the capacity of the target treatment unit and the target pollutants can be obtained through the equipment design description and are not limited here.

[0061] Taking into account the fluctuations in the pollutant concentration in the wastewater to be purified and the fluctuations in the performance of the treatment unit, it is necessary to timely compare the real-time treatment rate and the preset treatment rate, so as to regulate the wastewater flow entering the treatment unit and the corresponding treated pollutant concentration in the wastewater, so as to put the purification device in a better working state, improve the water purification effect, and ensure the water purification efficiency. Therefore, according to the difference between the real-time treatment rate and the preset treatment rate, combined with the outlet water flow of the target buffer unit and the target pollutant concentration in the water injection valve 17, the initial flow control parameters and the initial dilution parameters are obtained.

[0062] Preferably, in one embodiment of the present invention, considering that the difference between the real-time processing rate and the preset ideal processing rate of the target processing unit is different, the adjustment of the target buffer unit is different, so the relative difference between the current real-time processing rate and the preset ideal processing rate of the target processing unit is first compared; considering that the larger the real-time processing rate is relative to the preset ideal processing rate, the larger the real-time processing difference parameter is, indicating that the current processing rate is higher than the ideal processing rate, the processing pressure of the processing unit is small, and the water outlet flow rate of the target buffer unit of the processing unit can be increased; at the same time, in order to limit the adjustment range of the water outlet flow rate, a preset flow adjustment coefficient is set;

[0063] Based on this, according to the relative difference between the real-time processing rate at the current time point and the preset ideal processing rate of the target processing unit, the real-time processing difference parameter at the current time point is obtained;

[0064] According to the real-time processing difference parameters at the current time point, the preset flow adjustment coefficient and the outlet flow of the target buffer unit, the initial flow control parameters of the target buffer unit at the current time point are obtained; the real-time processing difference parameters, the preset flow adjustment coefficient and the outlet flow are positively correlated with the initial flow control parameters.

[0065] As an example, the calculation formula of the initial flow control parameters includes: ,in, Indicates the target buffer unit The water flow adjustment value at time , which is also the initial flow control parameter; Indicates the preset flow adjustment factor. In this example ; Indicates the target buffer unit Water flow rate at the moment; Indicates the target processing unit Real-time processing of difference parameters at all times, , Indicates the target processing unit Real-time processing rate at all times, The preset ideal processing rate of the target processing unit.

[0066] In the calculation formula of the initial flow control parameters, Indicates the relative difference between the real-time processing rate and the preset ideal processing rate of the target processing unit. When the real-time processing rate is less than the preset ideal processing rate of the target processing unit, it means that the current processing rate is lower than the ideal rate, the processing pressure of the target processing unit is relatively large, and the water outflow of the target buffer unit can be reduced; The flow adjustment range is limited to improve the stability of the target processing unit.

[0067] Preferably, in one embodiment of the present invention, when the real-time processing difference parameter is greater than or equal to zero, it is not necessary to dilute the target pollutant concentration of the target buffer unit. At the same time, in order to save water resources, the treated and purified water is usually used for dilution during the wastewater dilution treatment to achieve the purpose of recycling. At this time, it is possible that the target pollutant concentration in the water injection valve 17 is greater than or equal to the target pollutant concentration in the target buffer unit, and the dilution effect cannot be achieved. Therefore, when the real-time processing difference parameter is greater than or equal to zero, or the target pollutant concentration in the water injection valve 17 is greater than or equal to the target pollutant concentration in the target buffer unit, the initial dilution parameter is set to zero;

[0068] Taking into account that when the real-time processing difference parameter is less than zero, the processing pressure of the target processing unit is relatively large, and at the same time, the target pollutant concentration in the water injection valve 17 is less than the target pollutant concentration in the target buffer unit, the processing pressure of the target processing unit can be alleviated by diluting the target pollutant concentration to ensure the water purification effect. Since the smaller the real-time processing difference parameter is, the greater the processing pressure of the target processing unit and the greater the amplitude of the dilution concentration, when the real-time processing difference parameter is less than zero and the target pollutant concentration in the water injection valve 17 is less than the target pollutant concentration in the target buffer unit, the real-time processing difference parameter is negatively correlated and normalized as the initial dilution coefficient; the product of the target pollutant concentration in the target buffer unit and the initial dilution coefficient is used as the initial dilution parameter.

[0069] As an example, the calculation formula for the initial dilution factor includes: ;in, Indicates the target buffer unit The initial dilution factor at time; Indicates the target buffer unit Target pollutant concentration at the time; Indicates the target processing unit Real-time processing of difference parameters at each moment; represents the linear normalization function; Indicates the target buffer unit The initial dilution factor at time.

[0070] In the calculation formula of the initial dilution factor, The real-time processing difference parameters are negatively correlated and normalized. The smaller the real-time processing difference parameters are, the greater the processing pressure of the target processing unit, the greater the dilution concentration range, and the larger the initial dilution parameter. This is a preliminary measure of the concentration range of the target pollutant in the target buffer unit that needs to be diluted, providing a basis for subsequent further corrections.

[0071] In other embodiments of the present invention, the implementer may also use other negative correlation mapping functions such as , negative correlation mapping and normalization of real-time processing difference parameters, represents the hyperbolic tangent function, Represents the independent variable.

[0072] It should be noted that when When it is zero, it means that the target buffer unit cannot be diluted or has a strong processing capacity and does not need to be diluted. At this time, the subsequent correction of the dilution parameters and the analysis process of the final dilution parameters can be omitted, thereby improving the calculation efficiency of the control unit.

[0073] Correction processing module 102: according to the change characteristics of the real-time processing rate, obtain the capacity decay index of the target processing unit; according to the change characteristics of the capacity decay index, combined with the initial flow control parameters and the initial dilution parameters, obtain the corrected flow control parameters and the corrected dilution parameters.

[0074] Since some processing units of the equipment need to rely on other raw materials or devices, such as filter screen 9, activated carbon filter screen 15, etc., during the process of wastewater treatment and purification, the overall processing capacity shows a decay characteristic as the wastewater is continuously treated and purified, which is directly reflected in the fluctuation of the real-time processing rate. Therefore, according to the changing characteristics of the real-time processing rate, the capacity decay index of the target processing unit is obtained, which provides a basis for further correcting the initial flow control parameters and the initial dilution parameters from the perspective of the attenuation of the processing capacity of the target processing unit.

[0075] Preferably, in one embodiment of the present invention, in order to analyze the variation characteristics of the real-time processing rate, curve fitting is performed on the real-time processing rate of the target processing unit at all time points to obtain a processing rate variation curve; considering that the instantaneous slope of the processing rate reflects the variation of the processing rate of the current target processing unit, when the instantaneous slope of the processing rate is greater than zero, it indicates that the processing rate of the target processing unit is increasing, and therefore the instantaneous slope of the processing rate of the target processing unit at the current time point is obtained;

[0076] The difference between the maximum value of the real-time processing rate of the target processing unit and the real-time processing rate at the current time point is taken as the attenuation coefficient; wherein the maximum value of the real-time processing rate is the minuend; considering that the larger the attenuation coefficient is, the smaller the current real-time processing rate is relative to the maximum value of the real-time processing rate, the weaker the processing capacity is, and at the same time, the smaller the instantaneous slope of the processing rate is, the more the current processing rate shows a downward trend, so according to the attenuation coefficient at the current time point, combined with the instantaneous slope of the processing rate at the current time point, the capacity attenuation index of the target processing unit at the current time point is obtained; the instantaneous slope of the processing rate is negatively correlated with the capacity attenuation index; the attenuation coefficient is positively correlated with the capacity attenuation index.

[0077] As an example, the calculation formula for the capacity decay index includes: ;in Indicates the target processing unit The capacity decay index at the moment; represents the linear normalization function; Indicates the target processing unit The attenuation coefficient at the moment; Indicates the target processing unit The instantaneous slope of the processing rate at a moment.

[0078] In the calculation formula of the capacity decay index, negative correlation mapping is performed by taking the inverse method. The greater the difference between the maximum value of the real-time processing rate and the current real-time processing rate, the greater the decay coefficient. The larger the value is, the smaller the current real-time processing rate is relative to the maximum value of the real-time processing rate, the weaker the processing capacity is, and the larger the capacity attenuation index is; the smaller the instantaneous slope of the processing rate is, the more the current processing rate shows a downward trend, and the larger the capacity attenuation index is.

[0079] It should be noted that, in one embodiment of the present invention, by taking time as the horizontal coordinate and the real-time processing rate as the vertical coordinate, the processing rate change curve is obtained by connecting adjacent real-time processing rates, and the slope of the line connecting the real-time processing rate at the current time point and the real-time processing rate at the adjacent historical time point is used as the instantaneous slope of the processing rate at the current time point; in other embodiments of the present invention, the implementer may also use a negative correlation mapping function such as Perform negative correlation mapping, , Expressed as a natural constant is the exponential function of the base, represents the independent variable; the attenuation coefficient and the instantaneous slope of the processing rate can also be fused by weighted summation, such as ; Curve fitting can also be performed using existing methods such as the least squares method, which will not be described in detail here.

[0080] It should be noted that, in one embodiment of the present invention, the larger the capacity decay index is, the weaker the processing capacity of the target processing unit is, and the more timely the target processing unit needs to be maintained. Therefore, when the capacity decay index is greater than 0.5, it is determined that the processing capacity of the target processing unit is too low, and the raw materials or devices in the target processing unit are replaced or cleaned.

[0081] After obtaining the capacity attenuation index, the initial flow control parameters and initial dilution parameters can be corrected from the perspective of the processing capacity attenuation of the target processing unit according to the changing characteristics of the capacity attenuation index to improve the accuracy of adjustment of the purification device. Therefore, according to the changing characteristics of the capacity attenuation index and combined with the initial flow control parameters and initial dilution parameters, the corrected flow control parameters and corrected dilution parameters are obtained to further improve the control accuracy of the target buffer unit and maintain the working stability of the purification device.

[0082] Preferably, in one embodiment of the present invention, considering that the greater the difference between the current capacity decay index and the historical adjacent capacity decay index, the greater the current capacity decay index is relative to the historical adjacent capacity decay index, the processing capacity of the target processing unit is further reduced, and the water outlet flow of the target buffer unit needs to be further reduced. Based on this, the difference between the capacity decay index at the current time point and the historical adjacent capacity decay index is normalized and used as the correction coefficient at the current time point; wherein the current capacity decay index is the minuend;

[0083] According to the initial flow control parameters at the current time point, the numerical absolute values ​​of the initial flow control parameters and the correction coefficients, the corrected flow control parameters of the target buffer unit at the current time point are obtained; the initial flow control parameters are positively correlated with the corrected flow control parameters; the numerical absolute values ​​and correction coefficients of the initial flow control parameters are both negatively and positively correlated with the corrected flow control parameters.

[0084] As an example, the difference between the current capacity decay index and the historical adjacent capacity decay index is normalized by a linear normalization function; the calculation formula for the modified flow control parameter includes:

[0085] ;in, Indicates the target buffer unit Corrected flow control parameters at each moment; Indicates the target buffer unit Initial flow control parameters at time; Indicates taking the absolute value; represents the linear normalization function; Indicates the target processing unit The capacity decay index at the moment; Indicates the target processing unit The capacity decay index at the moment; Indicates the target buffer unit Correction factor for time.

[0086] In the calculation formula of the modified flow control parameters, due to The possible sign is positive or negative. When the correction coefficient is positive, that is, the current processing rate is higher than the ideal processing rate, the processing pressure of the processing unit is small, and the water flow rate of the target buffer unit of the processing unit can be increased. At this time, the larger the correction coefficient, the further the processing capacity of the target processing unit is reduced. The absolute value of the amplitude does not affect the correction process; when When it is negative, it means that the processing pressure of the treatment unit increases. At the same time, the larger the correction coefficient is, the further the processing capacity of the target treatment unit is reduced, and the reduction range of the water flow rate needs to be increased. Take the absolute value.

[0087] It should be noted that when When it is 0, it means that the target processing unit is in the best state and there is no need to adjust the water flow rate of the target buffer unit. is also 0, that is, the adjustment value of the water outlet flow of the target buffer unit is 0.

[0088] It should be noted that in other embodiments of the present invention, the implementer may also set a positive amplitude parameter to control the correction amplitude, such as , Indicates the preset correction amplitude positive parameter, .

[0089] Preferably, in one embodiment of the present invention, considering that the larger the correction coefficient is, the further the processing capacity of the target processing unit is reduced, and the more it is necessary to increase the dilution degree of the target pollutant concentration in the target buffer unit, the corrected dilution parameters of the target buffer unit at the current time point are obtained based on the initial dilution parameters and the correction coefficient at the current time point; the initial dilution parameters and the correction coefficient are positively correlated with the corrected dilution parameters.

[0090] As an example: The calculation formula for the corrected dilution parameter includes: ;in, Indicates the target buffer unit Corrected dilution parameters at the time; Indicates the target buffer unit The initial dilution factor at time; Indicates the target processing unit The capacity decay index at the moment; Indicates the target processing unit The capacity decay index at the moment; Indicates the target buffer unit Correction factor for time.

[0091] In the calculation formula of the corrected dilution parameter, The larger it is, the further the processing capacity of the target processing unit is reduced, and the more it is necessary to increase the dilution degree of the target pollutant concentration in the target buffer unit. The greater the increase in the initial dilution coefficient, the larger the corrected dilution parameter.

[0092] It should be noted that, in other embodiments of the present invention, a positive amplitude parameter may also be set to control the correction amplitude. , Indicates the preset correction amplitude positive parameter, .

[0093] Final control module 103: according to the change of target pollutant concentration corresponding to all treatment units, the treatment time and the attenuation characteristics of the treatment capacity, combined with the corrected dilution parameters of the target treatment unit, obtain the final dilution parameters of the target treatment unit; control the target pollutant concentration in the target buffer unit according to the final dilution parameters; control the water outlet valve of the target buffer unit according to the corrected flow control parameters.

[0094] Taking into account that when the target buffer unit is diluted, it may have an impact on the subsequent treatment units. For example, the dilution water contains pollutants A and pollutants B, the target buffer unit A and the target treatment unit a correspondingly treat pollutant A, the target buffer unit B and the target treatment unit b correspondingly treat pollutant B, the target buffer unit B is downstream of the target treatment unit a, and the target treatment unit b is downstream of the target buffer unit B. When the dilution operation is performed in the target buffer unit A, the concentration of pollutant B may increase, resulting in an increase in the concentration of pollutant B in the target buffer unit B and an increase in the treatment pressure of the target treatment unit b. Therefore, according to the changes in the concentration of the target pollutants corresponding to all treatment units, the treatment time and the attenuation characteristics of the treatment capacity, the treatment pressure characteristics of the treatment unit are analyzed, and then combined with the corrected dilution parameters of the target treatment unit, the final dilution parameters of the target treatment unit are obtained; from the perspective of the impact of the dilution operation on the subsequent treatment units, the corrected dilution parameters are further corrected to improve the working stability of the purification device and ensure the purification effect.

[0095] It should be noted that the upstream and downstream order or sequence of the device parts mentioned in the embodiments of the present invention is the order in which the wastewater flows through the purification device. For example, the target treatment unit b is downstream of the target buffer unit B, which means that the wastewater first flows through the target buffer unit B and then flows through the target treatment unit b.

[0096] Preferably, in one embodiment of the present invention, considering that the larger the attenuation coefficient of the treatment unit, the shorter the wastewater treatment time, and the lower the concentration of pollutants in the wastewater are reduced, that is, the smaller the target purification parameter, the greater the pressure of the corresponding treatment unit, and the stronger the pressure rise trend, the attenuation coefficient is positively correlated with the treatment pressure rise index; the target purification parameter and the wastewater treatment time are negatively correlated with the treatment pressure rise index; considering that the dilution of the current target buffer unit will only affect the buffer unit 16 downstream of the target treatment unit, and will only affect the buffer unit 16 whose corresponding target pollutant concentration is less than the corresponding pollutant concentration in the water injection port of the target buffer unit, increase the pressure of the corresponding treatment unit, and the maximum value of the treatment pressure rise index of the affected treatment unit represents the maximum degree of influence of the affected treatment unit, so the affected treatment unit is first screened out, and the modified dilution parameter is adjusted according to the affected treatment unit;

[0097] Based on this, the treatment pressure rise index of each treatment unit at the current time point is obtained according to the attenuation coefficient of each treatment unit at the current time point, the corresponding target purification parameter and the wastewater treatment time;

[0098] The buffer units downstream of the target treatment unit are all called buffer units to be analyzed. When the target pollutant concentration corresponding to the buffer unit to be analyzed is less than the corresponding pollutant concentration in the water injection port of the target buffer unit, the buffer unit to be analyzed is used as an influencing buffer unit. Among the treatment units corresponding to all the influencing buffer units, the treatment unit with the largest treatment pressure rise index at the current time point is obtained as the influencing treatment unit. According to the corrected dilution parameter of the target buffer unit and the treatment pressure rise index of the influencing treatment unit, the final dilution parameter of the target buffer unit at the current time point is obtained.

[0099] As an example, the current attenuation coefficient of the treatment unit is used as the numerator, and the product of the corresponding target purification parameter and the wastewater treatment time is used as the denominator. The fractional ratio is linearly normalized and used as the current treatment pressure rise index of the corresponding treatment unit. The screening process of the influencing treatment units can be exemplified as follows: buffer unit 16 {A, B, C, D, E, F}, treatment unit {a, b, c, d, e, f}, pollutants {A, B, C, D, E, F}, the connection order is AaBbCcDdEeFf, the treatment units af treat pollutants A-F in sequence, if the current target treatment unit is a, then the buffer units to be analyzed include {B, C, D, E, F}; if the concentration of pollutant E in buffer unit E is less than the concentration of pollutant E in the water injection port of buffer unit A, and the concentration of pollutant F in buffer unit F is less than the concentration of pollutant F in the water injection port of buffer unit A, that is, when the dilution operation is performed in buffer unit A, the concentration of pollutant E in buffer unit E and the concentration of pollutant F in buffer unit F will increase, then the influencing buffer units include {E, F}, and in the corresponding treatment units {e, f}, the influencing treatment units are screened out, and if the treatment unit e has the largest pressure rise index in the current treatment, then the treatment unit e is the influencing treatment unit.

[0100] Preferably, in one embodiment of the present invention, considering that the larger the processing pressure rise index affecting the processing unit is, the greater the impact on the processing unit is when diluting the current target buffer unit, and the greater the amplitude of dilution of the current target buffer unit, the greater the pressure affecting the processing unit will be, which is not conducive to the stable operation of the purification device, and the processing pressure rise index is also normalized; so the difference between the constant 1 and the processing pressure rise index of the target processing unit is used as the impact correction coefficient, where the constant 1 is the minuend; the product of the impact correction coefficient at the current time point and the corrected dilution parameter is used as the final dilution parameter of the target buffer unit at the current time point.

[0101] During the calculation of the final dilution parameters, the larger the processing pressure rise index of the target processing unit is, the greater the impact on the influencing processing unit is when diluting the current target buffer unit, and the more it is necessary to limit the dilution range of the current target buffer unit. The smaller the impact correction coefficient is, the smaller the final dilution parameter is.

[0102] After comprehensively considering various factors, the final dilution parameter is obtained, and finally the target pollutant concentration in the target buffer unit is controlled according to the final dilution parameter, and the outlet valve of the target buffer unit is controlled according to the modified flow control parameter. The purification device is adaptively adjusted to take into account the working efficiency and purification effect of the purification device.

[0103] Preferably, in one embodiment of the present invention, considering that when the water injection valve 17 is controlled to dilute the target buffer unit, the target pollutant concentration in the water injection valve 17 needs to be less than the target pollutant concentration in the target buffer unit, and is diluted to the target pollutant concentration in the water injection valve 17 at most, based on this, when the target pollutant concentration of the target buffer unit is controlled at the current time point, the difference between the target pollutant concentration in the target buffer unit and the final dilution parameter is obtained as the diluted target concentration;

[0104] When the dilution target concentration is greater than the target pollutant concentration in the water injection valve 17, the water injection valve 17 is controlled to dilute the target pollutant concentration in the target buffer unit to the dilution target concentration;

[0105] When the dilution target concentration is less than or equal to the target pollutant concentration in the water injection valve 17, and the target pollutant concentration in the water injection valve 17 is less than the target pollutant concentration in the target buffer unit, the water injection valve 17 is controlled to dilute the target pollutant concentration in the target buffer unit to the target pollutant concentration in the water injection valve 17;

[0106] When the target pollutant concentration in the water injection valve 17 is greater than or equal to the target pollutant concentration in the target buffer unit, no dilution is performed.

[0107] In one embodiment of the present invention, the sum of the modified flow control parameter and the current water outlet flow rate of the target buffer unit is used as the water outlet target flow rate, and the closing degree of the water outlet valve is adjusted so that the water outlet flow rate reaches the water outlet target flow rate.

[0108] It should be noted that the target pollutant concentration and the target water outlet flow rate cannot be negative numbers, so the dilution target concentration and the target water outlet flow rate are both non-negative numbers. When a negative number is calculated, the calculation result is set to 0; when the target water outlet flow rate exceeds the maximum water outlet flow rate of the water outlet valve, the target water outlet flow rate is set to the maximum water outlet flow rate; the maximum water outlet flow rate can be obtained through the design parameters of the purification device and is not limited here; the dilution method of the liquid and the control method of the water outlet valve are both existing technologies and will not be repeated here.

[0109] The above operation is repeated in each buffer unit. After the multi-stage purification of the wastewater is completed, the purified water is reused, such as industrial reuse, agricultural irrigation, urban landscape water, underground recharge water, etc.

[0110] It should be noted that if it is to be used for more stringent purposes such as drinking, further treatment is required, such as reverse osmosis and ultraviolet disinfection.

[0111] During the multi-stage purification process, the equipment will produce a lot of impurities, and different treatments will be carried out on the solid waste and chemical sludge to reduce their harm to the environment. Among them, solid waste is mainly treated by incineration, landfill, anaerobic digestion and composting; chemical sludge is mainly treated by dehydration and drying, resource recovery and other methods.

[0112] In summary, in order to solve the technical problem that it is difficult to balance the effect and efficiency of multi-stage wastewater treatment, the present invention proposes a purification device for multi-stage treatment of wastewater; the present invention adds a buffer unit in the purification device, analyzes the working status of the treatment unit and the attenuation characteristics of the treatment capacity in real time through the control unit, and combines the pressure effect of the dilution operation on the post-treatment unit to accurately control the water outlet valve and the water injection valve of the buffer unit, and adjusts the working status of the treatment unit in real time, so that the purification device can adapt to the complex changes of wastewater, make full use of the treatment performance of the purification device, prevent the purification device from being overloaded and affecting the purification effect, and ensure the smooth operation of the purification device.

[0113] It should be noted that the sequence of the above embodiments of the present invention is only for description and does not represent the advantages and disadvantages of the embodiments. The processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0114] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

Claims

1. A purification device for multi-stage treatment of wastewater, comprising a purification device body, on which a treatment unit is installed; characterized in that: Each of the treatment units treats a type of wastewater pollutant; the purification device also installs a buffer unit in front of each of the treatment units; the buffer unit includes a sensor module, a water injection valve and a water outlet valve; the sensor module is used to monitor the concentration of wastewater pollutants inside the buffer unit and the treatment unit and the water injection valve in real time, and monitor the water outlet flow of the water outlet valve; the water injection valve is used to dilute high-concentration wastewater; the water outlet valve is used to control the wastewater flow entering the next treatment unit; the control unit is used to receive data from the sensor module and control the water injection valve and the water outlet valve of the buffer unit; the control unit includes an initial processing module, a correction processing module and a final control module; Initial processing module: select any of the processing units as the target processing unit, and obtain the target buffer unit and the target pollutant concentration accordingly; obtain the real-time processing rate of the target processing unit according to the outlet flow rate of the target buffer unit and the target pollutant concentration, combined with the capacity of the target processing unit and the target pollutant concentration; obtain the initial flow control parameters and initial dilution parameters according to the difference between the real-time processing rate and the preset processing rate, combined with the outlet flow rate of the target buffer unit and the target pollutant concentration in the water injection valve; A correction processing module: according to the change characteristics of the real-time processing rate, the capacity attenuation index of the target processing unit is obtained; according to the change characteristics of the capacity attenuation index, the initial flow control parameter and the initial dilution parameter are combined to obtain a correction flow control parameter and a correction dilution parameter; Final control module: according to the change of the target pollutant concentration corresponding to all the processing units, the processing time and the attenuation characteristics of the processing capacity, combined with the corrected dilution parameter of the target processing unit, obtain the final dilution parameter of the target processing unit; control the target pollutant concentration in the target buffer unit according to the final dilution parameter; controlling a water outlet valve of the target buffer unit according to the modified flow control parameter; The method for acquiring the real-time processing rate includes: According to the capacity of the target treatment unit and the effluent flow rate at the current time point, the wastewater treatment time at the current time point is obtained; the capacity of the treatment unit is positively correlated with the wastewater treatment time; the effluent flow rate is negatively correlated with the wastewater treatment time; The average value of the target pollutant concentration in the target buffer unit within the adjacent historical time of the wastewater treatment time length at the current time point is used as the input concentration; the difference between the target pollutant concentration in the target treatment unit at the current time point and the input concentration is used as the target purification parameter at the current time point; according to the target purification parameter at the current time point, combined with the wastewater treatment time, the real-time processing rate at the current time point is obtained; the target purification parameter is positively correlated with the real-time processing rate; the wastewater treatment time is negatively correlated with the real-time processing rate; The method for obtaining the initial flow control parameters includes: According to the relative difference between the real-time processing rate at the current time point and the preset ideal processing rate of the target processing unit, obtaining a real-time processing difference parameter at the current time point; According to the real-time processing difference parameter at the current time point, the preset flow adjustment coefficient and the water outlet flow of the target buffer unit, the initial flow control parameter of the target buffer unit at the current time point is obtained; the real-time processing difference parameter, the preset flow adjustment coefficient and the water outlet flow are positively correlated with the initial flow control parameter; The method for obtaining the initial dilution parameter includes: When the real-time processing difference parameter is greater than or equal to zero, or the target pollutant concentration in the water injection valve is greater than or equal to the target pollutant concentration in the target buffer unit, setting the initial dilution parameter to zero; When the real-time processing difference parameter is less than zero and the target pollutant concentration in the water injection valve is less than the target pollutant concentration in the target buffer unit, the real-time processing difference parameter is negatively correlated and normalized as an initial dilution coefficient; the product of the target pollutant concentration in the target buffer unit and the initial dilution coefficient is used as the initial dilution parameter; The method for obtaining the capability decay index includes: Performing curve fitting on the real-time processing rate of the target processing unit at all time points to obtain a processing rate variation curve; obtaining an instantaneous slope of the processing rate of the target processing unit at a current time point; The difference between the maximum value of the real-time processing rate of the target processing unit and the real-time processing rate at the current time point is used as the attenuation coefficient; according to the attenuation coefficient at the current time point, combined with the instantaneous slope of the processing rate at the current time point, the capacity attenuation index of the target processing unit at the current time point is obtained; the instantaneous slope of the processing rate is negatively correlated with the capacity attenuation index; the attenuation coefficient is positively correlated with the capacity attenuation index; The method for obtaining the modified flow control parameters includes: Normalize the difference between the capability decay index at the current time point and the capability decay index at the adjacent time point in history to obtain the correction coefficient at the current time point; According to the initial flow control parameter at the current time point, the absolute value of the initial flow control parameter and the correction coefficient, the corrected flow control parameter of the target buffer unit at the current time point is obtained; the initial flow control parameter is positively correlated with the corrected flow control parameter; the absolute value of the initial flow control parameter and the correction coefficient are both negatively and positively correlated with the corrected flow control parameter; The method for obtaining the modified dilution parameter includes: According to the initial dilution parameter and the correction coefficient at the current time point, obtaining the corrected dilution parameter of the target buffer unit at the current time point; the initial dilution parameter and the correction coefficient are both positively correlated with the corrected dilution parameter; The method for obtaining the final dilution parameter includes: According to the attenuation coefficient of each treatment unit at the current time point, the corresponding target purification parameter and the wastewater treatment time, the treatment pressure rise index of each treatment unit at the current time point is obtained; the attenuation coefficient is positively correlated with the treatment pressure rise index; the target purification parameter and the wastewater treatment time are both negatively correlated with the treatment pressure rise index; The buffer units downstream of the target processing unit are all referred to as buffer units to be analyzed. When the target pollutant concentration corresponding to the buffer unit to be analyzed is less than the corresponding pollutant concentration in the water injection port of the target buffer unit, the buffer unit to be analyzed is used as an influencing buffer unit. Among the processing units corresponding to all the influencing buffer units, the processing unit with the largest processing pressure rise index at the current time point is obtained as the influencing processing unit. According to the corrected dilution parameter of the target buffer unit and the processing pressure rise index of the influencing processing unit, the final dilution parameter of the target buffer unit at the current time point is obtained. The method for obtaining the final dilution parameter of the target buffer unit at the current time point according to the modified dilution parameter of the target buffer unit and the processing pressure rise index affecting the processing unit includes: The processing pressure rise index is also normalized; the difference between the constant 1 and the processing pressure rise index of the target processing unit is used as the influence correction coefficient; the product of the influence correction coefficient at the current time point and the corrected dilution parameter is used as the final dilution parameter of the target buffer unit at the current time point.

2. A multi-stage wastewater treatment purification device according to claim 1, characterized in that: The method for controlling the concentration of the target pollutant in the target buffer unit according to the final dilution parameter includes: Obtaining a difference between the target pollutant concentration in the target buffer unit and the final dilution parameter as a dilution target concentration; When the dilution target concentration is greater than the target pollutant concentration in the water injection valve, controlling the water injection valve to dilute the target pollutant concentration in the target buffer unit to the dilution target concentration; When the dilution target concentration is less than or equal to the target pollutant concentration in the water injection valve, and the target pollutant concentration in the water injection valve is less than the target pollutant concentration in the target buffer unit, controlling the water injection valve to dilute the target pollutant concentration in the target buffer unit to the target pollutant concentration in the water injection valve; When the target pollutant concentration in the water injection valve is greater than or equal to the target pollutant concentration in the target buffer unit, no dilution is performed.

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