System for determining content of heavy metal components in sewage

Abstract

The application relates to the technical field of electrochemical sensors, in particular to a sewage heavy metal component content determination system. The system comprises a data measurement module, a disturbed analysis module, a concentration adjustment module and a content determination module. The data measurement module measures the voltammetry curve and initial concentration of heavy metals in sewage samples. The disturbed analysis module compares the measured voltammetry curve with a standard voltammetry curve, constructs an inhibition factor of each heavy metal, and screens disturbed heavy metals. The concentration adjustment module determines a comparison sample through the initial concentration of the disturbed heavy metals, compares the voltammetry curve of each sewage sample, corrects the corresponding initial concentration combined with the inhibition factor, and obtains the final concentration of each heavy metal in each sewage sample. The content determination module detects the over-standard content of sewage heavy metals based on the final concentration. The accuracy of the over-standard content detection result is improved, and the problems of missed reports and false reports caused by the fact that organic pollutants hinder the electrochemical reaction of heavy metal ions, leading to inaccurate heavy metal concentration determination are reduced.

Description

Technical Field

[0001] This application relates to the field of electrochemical sensor technology, specifically to a system for determining the content of heavy metal components in wastewater. Background Technology

[0002] With industrial development, heavy metal pollution is one of the causes of global water pollution. Water bodies are the main carriers and diffusion pathways of heavy metal pollution. The long-term accumulation of heavy metals in rivers and other water bodies leads to water pollution, which seriously threatens the health and safety of aquatic organisms and humans. Therefore, rapid and accurate detection of the composition of heavy metals in water bodies is of great significance for ensuring drinking water safety and ecological environment health.

[0003] Electrochemical sensor technology is one of the commonly used techniques for determining the content of heavy metal components in wastewater. This technology is mainly based on the oxidation or reduction reaction of heavy metal ions on the electrode surface to generate electrons and form an electrical signal. The content of heavy metal components is determined based on the relationship between the electrical signal and the heavy metal concentration. However, actual wastewater usually contains a large number of complex organic pollutants that inhibit the electrochemical reaction of heavy metal ions, resulting in a lower current in the measured voltammetry curve, which in turn leads to inaccurate determination of heavy metal concentration, i.e., lower than the actual concentration. Summary of the Invention

[0004] To address the aforementioned technical problems, the purpose of this application is to provide a system for determining the content of heavy metal components in wastewater. The specific technical solution adopted is as follows:

[0005] This application discloses a system for determining the content of heavy metal components in wastewater, the system comprising:

[0006] Data measurement module: measures the voltammetric curve and initial concentration of each heavy metal in each wastewater sample;

[0007] Disturbance Analysis Module: Based on the peak width and waveform difference between the measured voltammetric curve and the standard voltammetric curve, the inhibition factor for each heavy metal concentration measurement is determined to screen for disturbed heavy metals;

[0008] Concentration Adjustment Module: Based on the initial concentration of each disturbed heavy metal in all wastewater samples, a comparison sample for each disturbed heavy metal is determined; based on the difference between the voltammetric curves of the same disturbed heavy metal in each wastewater sample and the comparison sample, and combined with the inhibition factor, a concentration adjustment coefficient for each disturbed heavy metal in each wastewater sample is constructed; based on the concentration adjustment coefficient, the initial concentration of each disturbed heavy metal in each wastewater sample is corrected to obtain the final concentration of each heavy metal in each wastewater sample;

[0009] Content determination module: Detects excessive levels of heavy metals in wastewater based on the final concentration.

[0010] In one embodiment, the process of obtaining the inhibitory factor is as follows:

[0011] The voltammetric curves of each heavy metal in the wastewater sample corresponding to its initial maximum concentration are denoted as the first voltammetric curve; the half-width of the standard voltammetric curve of each heavy metal is obtained and denoted as the standard half-width; the difference between the half-width of the first voltammetric curve and the standard half-width is taken as the half-width deviation of each heavy metal.

[0012] The difference between the voltammetric curves of each heavy metal measured in each wastewater sample and the standard voltammetric curve was calculated using a distance metric algorithm.

[0013] The inhibition factor is positively correlated with the deviation of the full width at half maximum (FWHM) and the degree of difference, respectively.

[0014] In one embodiment, the expression for the inhibition factor is:

[0015]

[0016] In the formula, This represents the inhibitory factor for the nth heavy metal ion. This represents the deviation of the full width at half maximum (FWHM) of the nth heavy metal. This represents the minimum deviation of the full width at half maximum (FWHM) for all heavy metals. , These represent the first current-voltage curve and the corresponding standard current-voltage curve for the nth heavy metal, respectively. Represents curve With curve The degree of difference between them This indicates the preset adjustment factor.

[0017] In one embodiment, the disturbed heavy metal is a heavy metal whose inhibition factor is greater than a preset inhibition factor threshold.

[0018] In one embodiment, the comparison sample is a wastewater sample corresponding to the maximum initial concentration of each disturbed heavy metal.

[0019] In one embodiment, the process of obtaining the concentration adjustment coefficient is as follows:

[0020] The difference between the voltammetric curves of each wastewater sample and the control sample for each disturbed heavy metal was calculated using a distance metric algorithm and denoted as the first difference.

[0021] When the half-peak width of each wastewater sample of each disturbed heavy metal is greater than or equal to the half-peak width of the control sample, the concentration adjustment coefficient is positively correlated with the half-peak width of each disturbed heavy metal in each wastewater sample, the first difference degree, and the inhibition factor.

[0022] When the half-peak width of each wastewater sample of each disturbed heavy metal is smaller than the half-peak width of the control sample, the concentration adjustment coefficient is positively correlated with the half-peak width of each disturbed heavy metal in each wastewater sample and the inhibition factor, and negatively correlated with the first degree of difference.

[0023] In one embodiment, the expression for the concentration adjustment coefficient is:

[0024]

[0025] In the formula, Indicates the first The concentration adjustment coefficient of the disturbed heavy metal in the i-th wastewater sample; Indicates the first Inhibitors of various types of disturbed heavy metals; , They represent the first The half-peak width of the disturbed heavy metal in the i-th wastewater sample and its comparison sample; Indicates the first The difference between the voltammetric curve of a disturbed heavy metal in the i-th wastewater sample and the voltammetric curve in the control sample; It is the hyperbolic tangent function.

[0026] In one embodiment, the process for obtaining the final concentration of each heavy metal in each wastewater sample is as follows:

[0027] The initial concentration of each disturbed heavy metal in each wastewater sample is corrected based on the concentration adjustment coefficient.

[0028] The corrected concentration of each disturbed heavy metal in each wastewater sample is taken as its final concentration. For the remaining heavy metals, their initial concentration in each wastewater sample is taken as their corresponding final concentration.

[0029] In one embodiment, the correction of the initial concentration of each disturbed heavy metal in each wastewater sample specifically involves:

[0030] Calculate the sum of the normalized value of the concentration adjustment coefficient of each disturbed heavy metal in each wastewater sample and the natural number 1; multiply the sum by the initial concentration of each disturbed heavy metal in each wastewater sample as the corrected concentration.

[0031] In one embodiment, the detection of excessive heavy metal content in wastewater based on the final concentration specifically includes:

[0032] If the final concentration of each heavy metal in each wastewater sample is greater than the specified concentration threshold for each heavy metal, then the concentration of each heavy metal in each wastewater sample is determined to exceed the standard; otherwise, the concentration of each heavy metal in each wastewater sample is determined not to exceed the standard.

[0033] This application has the following beneficial effects:

[0034] This application calculates the inhibitory factor of organic pollutants on the electrochemical reaction of each heavy metal ion in wastewater samples by measuring the voltammetric curves of wastewater samples and their half-peak width and curve similarity with standard voltammetric curves. By screening for disturbed heavy metals using these inhibitory factors, it can identify heavy metals in wastewater samples that are significantly affected by the inhibitory effect of organic pollutants, thus enabling targeted adjustment of their measured concentrations. By identifying comparative samples of disturbed heavy metals among all samples, analyzing the similarity characteristics of the voltammetric curves of each sample and the comparative samples, and combining this with the inhibitory factors, a concentration adjustment coefficient is constructed to correct the concentration of disturbed heavy metals in each sample. This significantly improves the reliability and consistency of concentration estimation, making the adjusted concentration closer to the true value. The corrected concentration is then used for content exceedance detection, improving the accuracy of the detection results and reducing false alarms or missed alarms caused by measurement errors. This solves the problem of inaccurate heavy metal concentration measurement in wastewater by electrochemical sensors due to the inhibition of heavy metal ion electrochemical reactions by organic pollutants. Attached Figure Description

[0035] To more clearly illustrate the technical solutions and advantages in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a block diagram of a wastewater heavy metal component content determination system provided in one embodiment of this application;

[0037] Figure 2 Flowchart of the wastewater heavy metal content determination system;

[0038] Figure 3 This is a schematic diagram of the process of obtaining the inhibitory factor. Detailed Implementation

[0039] To further illustrate the technical means and effects adopted by this application to achieve the intended purpose of the invention, the following, in conjunction with the accompanying drawings and preferred embodiments, details the specific implementation, structure, features, and effects of the wastewater heavy metal component content determination system proposed in this application. In the following description, different "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0040] Unless otherwise defined, 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 application pertains.

[0041] The specific scheme of the wastewater heavy metal component content determination system provided in this application is described in detail below with reference to the accompanying drawings.

[0042] Please see Figure 1 The diagram illustrates a block diagram of a wastewater heavy metal component content determination system according to an embodiment of this application. The system includes:

[0043] The data measurement module 101 measures the voltammetric curve and initial concentration of each heavy metal in each wastewater sample.

[0044] First, several equal-volume wastewater samples are collected from different locations in the wastewater using an automated collection device. Preferably, in this embodiment, 10 wastewater samples are collected. In other embodiments, the implementer can set the number of wastewater samples according to the actual application scenario. Then, a heavy metal sensor is used to determine the concentration of each heavy metal element in each wastewater sample. In this embodiment, the heavy metal elements include lead, mercury, cadmium, and chromium. The sensor is an electrochemical sensor, the stirring speed is set to 300 rpm, and the scan rate is set to 20 mV / s. The voltammetric curves and measured concentration values ​​of each heavy metal in each wastewater sample are obtained, and these concentration values ​​are recorded as the initial concentration. It should be noted that the implementer can set the stirring speed and scan rate during wastewater sample detection according to the actual situation, and this application does not impose specific restrictions. The measurement of voltammetric curves and metal ion concentrations using an electrochemical sensor is a known technique, and the specific process will not be described in detail.

[0045] The disturbance analysis module 102 determines the inhibition factor for each heavy metal concentration measurement based on the peak width and waveform difference between the measured voltammetric curve and the standard voltammetric curve, in order to screen for disturbed heavy metals.

[0046] The pre-saved standard voltammetric curves of various heavy metals without organic pollutants are retrieved from the disturbed analysis module for analysis.

[0047] Organic pollutants in wastewater do not inhibit the electrochemical reactions of all heavy metal ions. For example, humic acid readily forms complexes with free lead ions, reducing the content of free lead ions. These complexes are easily adsorbed onto the electrode surface, leading to uneven reaction regions of heavy metal ions. This results in gentler rising and falling edges of the peaks in the voltammetric curve, leading to a wider peak width. Humic acid has a smaller impact on most other heavy metal ions, and the measured concentration is closer to the actual value. To shorten the measurement cycle, heavy metal types less affected by organic pollutants can be screened out, reducing the calculation workload for their concentrations. Correction calculations are only performed for heavy metal concentrations that deviate significantly from the actual values. Since other parameters such as stirring speed and scanning rate remain consistent, the peak width is basically unrelated to the heavy metal concentration and is mainly related to the inhibitory effect of organic pollutants on heavy metal ions. Based on the peak width characteristics of the measured voltammetric curves of different heavy metals, heavy metal types more significantly affected by the inhibitory effect of organic pollutants can be screened out.

[0048] Specifically, a suitable peak width is first selected because baseline drift is prone to occur at the baseline, making it impossible to accurately quantify the peak width. Therefore, this application obtains the half-maximum width (WHM) of the oxidation peak in the voltammetric curve. Furthermore, since the higher the concentration of heavy metals, the higher the peak current, and the further the WHM is from the baseline, it more accurately reflects the peak width state. Therefore, the voltammetric curves corresponding to the maximum initial concentration of each heavy metal in all wastewater samples are obtained, denoted as the first voltammetric curve, and the WHM of the first voltammetric curve is obtained. Simultaneously, the WHM of the standard voltammetric curve for the corresponding heavy metal is obtained, denoted as the standard WHM. The difference between the WHM of the voltammetric curve measured for each heavy metal and the corresponding standard WHM is used as the WHM deviation for each heavy metal. The calculation of the WHM is a known technique, and the specific process will not be elaborated further. Changes in peak width indicate that the inhibitory effect of organic pollutants also alters the waveform of the measured heavy metal voltammetric curve, reducing its similarity to the standard voltammetric curve. Therefore, the difference between the measured volt-ampere curve and the corresponding standard volt-ampere curve for each heavy metal is calculated. Preferably, in this embodiment, the difference is the DTW distance between the measured volt-ampere curve and the corresponding standard volt-ampere curve for each heavy metal. The DTW distance is a known technique, and its specific process will not be elaborated further. In other embodiments of this application, the implementer may also use other distance measurement algorithms to calculate the difference between the volt-ampere curves. The greater the difference, i.e., the greater the DTW distance in this embodiment, the lower the similarity between the volt-ampere curves.

[0049] Based on the above analysis, the inhibition factor of organic pollutants in wastewater on the electrochemical reaction of each heavy metal ion is calculated to characterize the degree of inhibition of the electrochemical reaction of each heavy metal ion by organic pollutants. Preferably, in the embodiments of this application, the expression of the inhibition factor of each heavy metal ion is as follows:

[0050]

[0051] In the formula, This represents the inhibition factor for measuring the concentration of the nth heavy metal. This represents the deviation of the full width at half maximum (FWHM) of the nth heavy metal. This represents the minimum deviation of the full width at half maximum (FWHM) for all heavy metals. , These represent the first current-voltage curve and the corresponding standard current-voltage curve for the nth heavy metal, respectively. Represents curve With curve The degree of difference between them This represents the preset adjustment factor. Wherein, It is a very small positive number, used to avoid the denominator being 0, and its range of values ​​is... Preferably, in the embodiments of this application The value is 0.001. In other embodiments of this application, the implementer may set the value according to the actual situation, and this application does not impose specific restrictions.

[0052] In other embodiments of this application, the inhibition factor for each heavy metal ion can be the sum of the normalized value of the half-width deviation of each heavy metal and the normalized value of the difference.

[0053] The greater the deviation of the full width at half maximum (FWHM) of the measured voltammetric curve for heavy metals, the lower the similarity to the standard voltammetric curve. The higher the value, the greater the influence of organic pollutants on the electrochemical reaction of the heavy metal ions, and the larger the deviation between the preliminary measured concentration and the actual value.

[0054] The calculated inhibition factors of all heavy metals As input, the Otsu's inter-class variance algorithm is used to output the inhibition factor threshold. If the inhibition factor for each heavy metal is less than or equal to the threshold, it indicates that the organic pollutants in the wastewater have a low degree of inhibition on its electrochemical reaction, and the initially measured heavy metal concentration is closer to the actual value. If the inhibition factor for each heavy metal is greater than the threshold, it indicates that the organic pollutants in the wastewater have a high degree of inhibition on its electrochemical reaction, resulting in a lower peak current initially measured by the electrochemical sensor, which in turn leads to a larger deviation between the initially measured heavy metal concentration and the actual concentration. Subsequent concentration correction is required, and this type of heavy metal is identified as the disturbed heavy metal. The Otsu's inter-class variance algorithm is a well-known technique, and its specific process will not be elaborated further.

[0055] It should be noted that this application provides only one threshold segmentation algorithm for setting the inhibition factor threshold. There are many existing threshold segmentation algorithms, and implementers may also use other threshold segmentation algorithms to obtain the inhibition factor threshold. This application does not make any specific limitations.

[0056] The concentration adjustment module 103 determines the comparison samples of each disturbed heavy metal based on the initial concentration of each disturbed heavy metal in all wastewater samples; based on the difference between the voltammetric curves of the same disturbed heavy metal in each wastewater sample and the comparison samples, and in conjunction with the inhibition factor, it constructs the concentration adjustment coefficient of each disturbed heavy metal in each wastewater sample; and corrects the initial concentration of each disturbed heavy metal in each wastewater sample based on the concentration adjustment coefficient to obtain the final concentration of each heavy metal in each wastewater sample.

[0057] Theoretically, if there are no organic pollutants or the concentration of organic pollutants is consistent in each wastewater sample, the half-width of the voltammetric curve of the same heavy metal in each wastewater sample will be basically the same. However, in practice, wastewater samples are collected from different locations, so the concentration of organic pollutants in each sample also varies. The higher the concentration of organic pollutants, the more likely they are to undergo complexation reactions with heavy metal ions, resulting in a more uneven photochemical reaction region of heavy metal ions. This leads to a significant difference in the half-width of the voltammetric curve of the same heavy metal in different wastewater samples. That is, for the same heavy metal, the higher the concentration of organic pollutants in the sample, the larger the half-width of its voltammetric curve and the larger the inhibition factor. Therefore, the inhibition factor in one sample cannot represent all samples.

[0058] Specifically, for any disturbed heavy metal, the wastewater sample with the highest initial concentration among all wastewater samples is selected as the control sample. The half-width at half maximum (WHM) of the voltammetric curve of the control sample is obtained and compared with the WHM of the voltammetric curves of each wastewater sample of the disturbed heavy metal. Combined with the similarity between the corresponding voltammetric curves, the concentration of heavy metal in each sample is accurately corrected. Note that the highest concentration of heavy metal in the control sample does not necessarily mean the highest concentration of organic pollutants. Therefore, the rate of change of the WHM can be positive or negative. The data processing for other heavy metals is the same and will not be elaborated here.

[0059] Based on the above analysis, a concentration adjustment coefficient for each disturbed heavy metal in each wastewater sample is calculated. This coefficient is used to control the adjustment range of the initial heavy metal concentration determination for each disturbed heavy metal in each wastewater sample. Preferably, in this embodiment, the expression for the concentration adjustment coefficient is:

[0060]

[0061] In the formula, Indicates the first The concentration adjustment coefficient of the disturbed heavy metal in the i-th wastewater sample; Indicates the first Inhibitors of various types of disturbed heavy metals; , They represent the first The half-peak width of the disturbed heavy metal in the i-th wastewater sample and its comparison sample; Indicates the first The difference between the volt-ampere curve of a disturbed heavy metal in the i-th wastewater sample and the volt-ampere curve in the comparison sample is denoted as the first difference. Preferably, in this embodiment, the DTW distance is used to determine the difference between the volt-ampere curves. The implementer may also use other distance measurement algorithms to obtain the difference between the volt-ampere curves. This application does not impose specific restrictions. It is the hyperbolic tangent function.

[0062] like If the concentration is greater than or equal to 0, then the concentration of organic pollutants in each wastewater sample is greater than or equal to the concentration of organic pollutants in the control sample. Furthermore, the greater the difference in organic pollutant concentration between each wastewater sample and the control sample, the greater the difference in half-width at half-maximum (WWHM) between the two samples and the corresponding difference in their voltammetric curves. Therefore, the degree of upward adjustment of the concentration for each wastewater sample should be greater, resulting in a larger concentration adjustment coefficient. If the value is less than 0, the concentration of organic pollutants in each wastewater sample is less than that in the control sample. The smaller the concentration of organic pollutants in each wastewater sample is compared to that in the control sample, the greater the difference in half-width between the two samples and the greater the difference in the corresponding voltammetric curves. The degree of upward adjustment of the concentration of each wastewater sample should be smaller, and thus the smaller the concentration adjustment coefficient.

[0063] In other embodiments of this application, the expression for the concentration adjustment factor of each disturbed heavy metal in each wastewater sample may also be: .

[0064] To shorten the determination cycle of heavy metal content, only the initial concentrations of heavy metal species with inhibition factors greater than the threshold are corrected. The initial concentrations of heavy metals with smaller inhibition factors are very close to the actual values, thus reducing the need for correction calculations. Specifically, the initial concentration of each disturbed heavy metal in each wastewater sample is obtained, and corrected using the corresponding adjustment coefficient. Preferably, in this embodiment, the expression for the corrected heavy metal concentration is:

[0065]

[0066] In the formula, Indicates the first The corrected concentration of the disturbed heavy metal in the i-th wastewater sample. Indicates the first The initial concentration of the disturbed heavy metals measured in the i-th wastewater sample. This represents the hyperbolic tangent function, which normalizes the concentration adjustment coefficient to prevent excessively large concentration adjustments that significantly exceed the actual concentration. Specifically, for... Regarding normalization, this application only provides one normalization method. Many existing normalization methods exist, and implementers may also use other normalization algorithms. Normalization is not subject to specific restrictions in this application.

[0067] The content determination module 104 detects excessive levels of heavy metals in wastewater based on the final concentration.

[0068] The corrected concentration of each disturbed heavy metal in each wastewater sample is taken as its final concentration. For the remaining heavy metals, their initial concentrations in each wastewater sample are taken as their corresponding final concentrations. If the final concentration of each heavy metal in each wastewater sample exceeds the nationally stipulated concentration threshold for that heavy metal, the concentration of that heavy metal in the wastewater sample is determined to exceed the standard, and an alarm mechanism is triggered, displaying the type of heavy metal exceeding the standard and the wastewater sample number, so that staff can formulate a reasonable wastewater treatment plan. Otherwise, the concentration of that heavy metal in the wastewater sample is determined not to exceed the standard.

[0069] The flow chart of the wastewater heavy metal component content determination system is as follows: Figure 2 As shown; a schematic diagram of the process for obtaining the inhibitory factor is shown below. Figure 3 As shown.

[0070] In summary, this application's embodiments, by measuring the voltammograms of wastewater samples and calculating their half-peak width and curve similarity to standard voltammograms, calculate the inhibitory factor of organic pollutants on the electrochemical reactions of each heavy metal ion in the wastewater sample. By screening for disturbed heavy metals using these inhibitory factors, it is possible to identify heavy metals in wastewater samples that are significantly affected by the inhibitory effect of organic pollutants, thus enabling targeted adjustment of their measured concentrations. By identifying comparative samples of disturbed heavy metals among all samples and analyzing the similarity characteristics of the voltammograms of each sample and the comparative samples, and combining this with the inhibitory factors, a concentration adjustment coefficient is constructed to correct the concentration of disturbed heavy metals in each sample. This significantly improves the reliability and consistency of concentration estimation, making the adjusted concentration closer to the true value. Using the corrected concentration for content exceedance detection improves the accuracy of content exceedance detection results, reduces false alarms or missed alarms caused by measurement errors, and solves the problem of inaccurate heavy metal concentration measurement in wastewater by electrochemical sensors due to the inhibition of heavy metal ion electrochemical reactions by organic pollutants.

[0071] It should be noted that the order of the embodiments described above is merely for descriptive purposes and does not represent the superiority or inferiority of the embodiments. The processes depicted in the accompanying drawings do not necessarily require a specific or sequential order to achieve the desired result. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0072] The various embodiments in this application are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0073] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them; modifications to the technical solutions described in the foregoing embodiments, or equivalent substitutions of some of the technical features, 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, and should all be included within the protection scope of this application.

Claims

1. A system for determining the content of heavy metal components in wastewater, characterized in that, The system includes: Data measurement module: measures the voltammetric curve and initial concentration of each heavy metal in each wastewater sample; Disturbance Analysis Module: Based on the peak width and waveform difference between the measured voltammetric curve and the standard voltammetric curve, the inhibition factor for each heavy metal concentration measurement is determined to screen for disturbed heavy metals; Concentration Adjustment Module: Based on the initial concentration of each disturbed heavy metal in all wastewater samples, a comparison sample for each disturbed heavy metal is determined; based on the difference between the voltammetric curves of the same disturbed heavy metal in each wastewater sample and the comparison sample, and combined with the inhibition factor, a concentration adjustment coefficient for each disturbed heavy metal in each wastewater sample is constructed; based on the concentration adjustment coefficient, the initial concentration of each disturbed heavy metal in each wastewater sample is corrected to obtain the final concentration of each heavy metal in each wastewater sample; Content determination module: Detects excessive levels of heavy metals in wastewater based on the final concentration; The process of obtaining the inhibitory factor is as follows: The voltammetric curves of each heavy metal in the wastewater sample corresponding to its initial maximum concentration are denoted as the first voltammetric curve; the half-width of the standard voltammetric curve of each heavy metal is obtained and denoted as the standard half-width; the difference between the half-width of the first voltammetric curve and the standard half-width is taken as the half-width deviation of each heavy metal. The difference between the voltammetric curves of each heavy metal measured in the wastewater sample corresponding to the initial maximum concentration and the standard voltammetric curve was calculated using a distance metric algorithm. The inhibition factor is positively correlated with the deviation of the full width at half maximum (FWHM) and the degree of difference, respectively. The disturbed heavy metal is a heavy metal whose inhibition factor is greater than a preset inhibition factor threshold. The comparison samples are wastewater samples corresponding to the maximum initial concentration of each disturbed heavy metal; The process for obtaining the concentration adjustment coefficient is as follows: The difference between the voltammetric curves of each wastewater sample and the control sample for each disturbed heavy metal was calculated using a distance metric algorithm and denoted as the first difference. When the half-peak width of each wastewater sample of each disturbed heavy metal is greater than or equal to the half-peak width of the control sample, the concentration adjustment coefficient is positively correlated with the half-peak width of each disturbed heavy metal in each wastewater sample, the first difference degree, and the inhibition factor. When the half-peak width of each wastewater sample of each disturbed heavy metal is smaller than the half-peak width of the control sample, the concentration adjustment coefficient is positively correlated with the half-peak width of each disturbed heavy metal in each wastewater sample and the inhibition factor, and negatively correlated with the first degree of difference.

2. The wastewater heavy metal component content determination system according to claim 1, characterized in that, The expression for the inhibition factor is: In the formula, This represents the inhibition factor for measuring the concentration of the nth heavy metal. This represents the deviation of the full width at half maximum (FWHM) of the nth heavy metal. This represents the minimum deviation of the full width at half maximum (FWHM) for all heavy metals. , These represent the first current-voltage curve and the corresponding standard current-voltage curve for the nth heavy metal, respectively. Represents curve With curve The degree of difference between them This indicates the preset adjustment factor.

3. The wastewater heavy metal component content determination system according to claim 1, characterized in that, The expression for the concentration adjustment coefficient is: In the formula, Indicates the first The concentration adjustment coefficient of the disturbed heavy metal in the i-th wastewater sample; Indicates the first Inhibitors of various types of disturbed heavy metals; , They represent the first The half-peak width of the disturbed heavy metal in the i-th wastewater sample and its comparison sample; Indicates the first The difference between the voltammetric curve of a disturbed heavy metal in the i-th wastewater sample and the voltammetric curve in the control sample; It is the hyperbolic tangent function.

4. The wastewater heavy metal component content determination system according to claim 1, characterized in that, The process for obtaining the final concentration of each heavy metal in each wastewater sample is as follows: The initial concentration of each disturbed heavy metal in each wastewater sample is corrected based on the concentration adjustment coefficient. The corrected concentration of each disturbed heavy metal in each wastewater sample is taken as its final concentration. For the remaining heavy metals, their initial concentration in each wastewater sample is taken as their corresponding final concentration.

5. The wastewater heavy metal component content determination system according to claim 4, characterized in that, The correction of the initial concentration of each disturbed heavy metal in each wastewater sample is specifically as follows: Calculate the sum of the normalized value of the concentration adjustment coefficient of each disturbed heavy metal in each wastewater sample and the natural number 1; multiply the sum by the initial concentration of each disturbed heavy metal in each wastewater sample as the corrected concentration.

6. The wastewater heavy metal component content determination system according to claim 1, characterized in that, The detection of excessive heavy metal content in wastewater based on the final concentration is specifically as follows: If the final concentration of each heavy metal in each wastewater sample is greater than the specified concentration threshold for each heavy metal, then the concentration of each heavy metal in each wastewater sample is determined to exceed the standard; otherwise, the concentration of each heavy metal in each wastewater sample is determined not to exceed the standard.

Images