Efficient cyclic utilization industrial wastewater deep purification process

Abstract

The invention relates to the technical field of industrial wastewater treatment, and discloses an efficient cyclic utilization industrial wastewater deep purification process. According to the technology, the treatment grade CLDJ is obtained by comprehensively calculating the entering industrial wastewater according to the COD value, the conductivity and the heavy metal value, meanwhile, the treatment grade CLDJ is judged, when the treatment grade CLDJ is in a first interval, it is judged that the industrial wastewater is low-pollution, a first treatment instruction is executed, and when the treatment grade CLDJ is in a second interval, it is judged that the industrial wastewater is medium-pollution, and a second treatment instruction is executed. And judging that the industrial wastewater is medium pollution when the industrial wastewater is in the first interval, executing the second treatment instruction, judging that the industrial wastewater is medium pollution when the industrial wastewater is in the third interval, executing the third treatment instruction, and determining the purification process of the industrial wastewater according to different corresponding instructions, so that effective monitoring and treatment of the industrial wastewater can be realized through the comprehensive evaluation and treatment scheme. By means of the method, the accuracy of wastewater treatment can be improved, and meanwhile a scientific basis can be provided for follow-up supervision and management.

Description

Technical Field

[0001] The present invention relates to the technical field of industrial wastewater treatment, in particular to a high-efficiency recycled industrial wastewater deep purification process. Background Art

[0002] Industrial wastewater typically has complex pollutant compositions, high pollutant concentrations, a high concentration of toxic substances and difficult-to-biodegrade substances, and large fluctuations in water quality. Therefore, compared to domestic sewage, industrial wastewater is more difficult to treat. Biochemical treatment processes (activated sludge, biofilm, etc.) are widely used in industrial wastewater treatment due to their advantages such as good economy and simple technical processes. However, it is often difficult for industrial wastewater to meet discharge standards after biochemical treatment alone. Therefore, industrial wastewater that has undergone biochemical treatment often requires further deep treatment. Currently, the main deep treatment processes for industrial wastewater include Fenton oxidation, ozone oxidation, activated carbon adsorption, and reverse osmosis.

[0003] Currently, the treatment methods used for industrial wastewater only use a single path for purification, and do not grade the pollution level of industrial wastewater, resulting in low resource utilization. Summary of the Invention

[0004] (1) Technical problems solved

[0005] In response to the deficiencies of the prior art, the present invention provides a highly efficient and cyclical deep purification process for industrial wastewater, which has the advantages of graded treatment of industrial wastewater and solves the above-mentioned technical problems.

[0006] (2) Technical solution

[0007] To achieve the above object, the present invention provides the following technical solution: a high-efficiency recycling industrial wastewater deep purification process, comprising the following steps:

[0008] Step 1: Perform comprehensive multi-parameter calculation on the incoming industrial wastewater to obtain the treatment grade CLDJ;

[0009] Step 2: Determine the processing level and execute the corresponding processing instructions, including:

[0010] When the first processing threshold ≤ the processing level CLDJ < the second processing threshold, the industrial wastewater is determined to be low-polluting, and the first processing instruction is executed;

[0011] When the second processing threshold ≤ the processing level CLDJ < the third processing threshold, the industrial wastewater is determined to be moderately polluted, and the second processing instruction is executed;

[0012] When the third processing threshold ≤ the processing level CLDJ < the fourth processing threshold, the industrial wastewater is determined to be highly polluted, and the third processing instruction is executed;

[0013] Step 3: During the execution of step 2, when operating the device stored in the first processing instruction, the second processing instruction, or the third processing instruction, the device status is monitored.

[0014] As a preferred technical solution of the present invention, the specific steps of calculating the grade of the incoming industrial wastewater in step 1 to obtain the treatment grade CLDJ are as follows:

[0015] Step A1: Obtaining the physical and chemical parameters of industrial wastewater entering the collection tank and a historical industrial wastewater database, wherein the physical and chemical parameters specifically include COD value, conductivity, and heavy metal value. The historical industrial wastewater database stores the COD value, conductivity, and heavy metal value of each industrial wastewater treatment;

[0016] Step A2: pre-processing the physical and chemical parameters collected from multiple sampling points;

[0017] Step A3: The physical and chemical parameters collected at multiple sampling points after pretreatment are respectively calculated with the historical discharge values of COD value, conductivity and heavy metal value of industrial wastewater treatment stored in the historical industrial wastewater database, and finally the treatment grade CLDJ is obtained.

[0018] As a preferred technical solution of the present invention, the specific expression for pre-processing the physical and chemical parameters collected at multiple sampling points in step A2 is as follows:

[0019]

[0020] Among them, x represents any one element among COD value, conductivity and heavy metal value, YCL x Represents the preprocessed value of the xth element, N x Indicates the number of sampling points of the xth element, n x Indicates the nth x sampling points, n x ∈[1,N x ], Indicates the nth x The sampling value of the sampling point, Indicates total N x The sample values of the sampling points are summed.

[0021] As a preferred technical solution of the present invention, in step A3, the physical and chemical parameters collected at multiple sampling points after pretreatment are respectively calculated with the historical discharge values of COD value, conductivity and heavy metal value of industrial wastewater treatment stored in the historical industrial wastewater database to finally obtain the specific expression of treatment level CLDJ as follows:

[0022]

[0023] Among them, x represents any one element among COD value, conductivity and heavy metal value, YCL x,0 Represents the historical emission value of the xth element, YCL x Represents the preprocessing value of the xth element, CLDJ represents the processing level, Indicates the sum of the x-th element.

[0024] As a preferred technical solution of the present invention, the historical emission value YCL of the xth element x,0 The expression is as follows:

[0025]

[0026] Among them, YCL x,0 represents the historical emission value of the xth element, represents the historical emission mean of the x-th element, and max{LSYCL} represents the maximum value of the historical emission sampling of the x-th element.

[0027] As a preferred technical solution of the present invention, the specific measures of the first processing instruction are as follows:

[0028] Step B1: Use a grid with a pore size of 5mm-10mm to intercept the suspended matter, set the residence time to 4-6 hours, and adjust the pH to neutral;

[0029] Step B2: Use a plug-flow aeration tank to control the dissolved oxygen at 2mg / L-3mg / L, maintain the suspended solids concentration of the mixed liquid at 2000mg / L-3000mg / L, and use a vertical flow sedimentation tank with the surface load controlled at 0.8-1.2m 3 / m 2 ·h;

[0030] Step B3: Use a dose of 40-60 mJ / cm 2 of ultraviolet radiation.

[0031] As a preferred technical solution of the present invention, the specific measures of the second processing instruction are as follows:

[0032] Step C1: Remove grease and colloids using dissolved air flotation technology, followed by pre-treatment with UASB;

[0033] Step C2: Use A 2 After treatment with / O process, the microbial attachment area is increased;

[0034] Step C3: Add 50mg / L-100mg / L of polyaluminium chloride and 0.5mg / L-1mg / L of polyacrylamide to form flocs and precipitate them, reducing the suspended solids content in the water to less than 30mg / L. Then use column fixed bed activated carbon to adsorb the residual organic matter, and control the air velocity at 2-4h. -1 .

[0035] As a preferred technical solution of the present invention, the specific measures of the third processing instruction are as follows:

[0036] Step D1: using Fenton's reagent to remove some organic matter through oxidation reaction, adding sodium sulfide and performing coagulation treatment;

[0037] Step D2: Anaerobic ammonium oxidation was performed in a sequencing batch reactor at a temperature of 30-35°C, followed by solid-liquid separation and organic matter removal using a 0.1 μm pore size PVDF hollow fiber membrane;

[0038] Step D3: 80-120 mg / L of TiO2 / γ-Al2O3 catalyst is added to reduce COD, and desalination is performed using a spiral membrane assembly at an operating pressure of 1.5-2.5 MPa.

[0039] As a preferred technical solution of the present invention, in step 3, during the execution of step 2, when operating the device stored in the first processing instruction, the second processing instruction, or the third processing instruction, the specific steps of monitoring the device status are as follows:

[0040] Step E1: Read the error code of any device. When any device reports an error, set the corresponding error weight value to 1;

[0041] Step E2: Based on the error weight of any device, calculate the overall comprehensive weight ZTZHQZ. When the overall comprehensive weight ZTZHQZ exceeds the overall risk threshold, dispatch staff to perform maintenance.

[0042] As a preferred technical solution of the present invention, the specific expression for calculating the overall comprehensive weight ZYZHQZ in step E2 is as follows:

[0043] ZTZHQZ=∑BCQX

[0044] BCQX represents the error weight of any device, and ∑BCQX represents the sum of the error weights of any device.

[0045] Compared with the existing technology, the present invention provides a highly efficient and cyclic industrial wastewater deep purification process with the following beneficial effects:

[0046] The present invention obtains the treatment level CLDJ by comprehensively calculating the COD value, conductivity and heavy metal value of the incoming industrial wastewater, and at the same time judges the treatment level CLDJ. When it is in the first interval, the industrial wastewater is judged to be low-pollution, and the first treatment instruction is executed. When it is in the second interval, the industrial wastewater is judged to be medium-pollution, and the second treatment instruction is executed. When it is in the third interval, the industrial wastewater is judged to be medium-pollution, and the third treatment instruction is executed. At the same time, the purification process of the industrial wastewater is determined according to the corresponding instructions. Therefore, through the above-mentioned comprehensive evaluation and treatment plan, effective monitoring and treatment of industrial wastewater can be achieved, resource utilization efficiency can be improved and the impact on the environment can be reduced. This method can not only improve the accuracy of wastewater treatment, but also provide a scientific basis for subsequent supervision and management. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a schematic diagram of the process flow of the present invention. DETAILED DESCRIPTION

[0048] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0049] See also Figure 1 , a high-efficiency recycling industrial wastewater deep purification process, including the following steps:

[0050] Step 1: Perform comprehensive multi-parameter calculation on the incoming industrial wastewater to obtain the treatment grade CLDJ;

[0051] In step 1, the grade of the incoming industrial wastewater is calculated to obtain the treatment grade CLDJ. The specific steps are as follows:

[0052] Step A1: Obtain the physical and chemical parameters of industrial wastewater entering the collection tank and the historical industrial wastewater database. The physical and chemical parameters specifically include: COD value, conductivity, and heavy metal value. The historical industrial wastewater database stores the COD value, conductivity, and heavy metal value of each industrial wastewater treatment;

[0053] Step A2: pre-processing the physical and chemical parameters collected from multiple sampling points;

[0054] The specific expression for preprocessing the physical and chemical parameters collected at multiple sampling points in step A2 is as follows:

[0055]

[0056] Among them, x represents any one element among COD value, conductivity and heavy metal value, YCL x Represents the preprocessed value of the xth element, N x Indicates the number of sampling points of the xth element, n x Indicates the nth x sampling points, n x ∈[1,N x ], Indicates the nth x The sampling value of the sampling point, Indicates total N x The sampling values of the sampling points are summed up and averaged to ensure that the global factors of the entire wastewater are taken into consideration;

[0057] Step A3: Calculate the physical and chemical parameters collected at multiple sampling points after pretreatment with the historical discharge values of COD, conductivity, and heavy metal values of industrial wastewater treatment stored in the historical industrial wastewater database to ultimately obtain the treatment grade CLDJ. The essential purpose of selecting the COD, conductivity, and heavy metal values of industrial wastewater treatment is that data measurement is more convenient and can quickly obtain results. The COD value can be obtained by rapid digestion spectrophotometry, and heavy metals can be measured by a portable XRF spectrometer.

[0058] In step A3, the physical and chemical parameters collected at multiple sampling points after pretreatment are respectively calculated with the historical discharge values of COD value, conductivity and heavy metal value of industrial wastewater treatment stored in the historical industrial wastewater database to finally obtain the specific expression of treatment level CLDJ as follows:

[0059]

[0060] Among them, x represents any one element among COD value, conductivity and heavy metal value, YCL x,0 Indicates the historical emission value of the xth element, YCL x Represents the preprocessing value of the xth element, CLDJ represents the processing level, Indicates the sum of the x-th element, where the historical emission value YCL of the x-th element is x,0 The expression is as follows:

[0061]

[0062] Among them, YCL x,0 represents the historical emission value of the xth element, represents the historical emission mean of the x-th element, and max{LSYCL} represents the maximum value of the historical emission sampling of the x-th element;

[0063] Step 2: Determine the processing level and execute the corresponding processing instructions, including:

[0064] When the first processing threshold ≤ the processing level CLDJ < the second processing threshold, the industrial wastewater is determined to be low-polluting, and the first processing instruction is executed;

[0065] The specific measures of the first processing instruction are as follows:

[0066] Step B1: Use a screen with an aperture of 5mm-10mm to intercept suspended solids, set the retention time to 4-6 hours, and adjust the pH to neutral to effectively remove large suspended solids and impurities in the wastewater. This prevents these substances from clogging or damaging equipment during subsequent treatment, ensuring the smooth progress of subsequent treatment processes. By adjusting the pH to neutral, suitable environmental conditions are provided for subsequent biological treatment, which is conducive to the growth and metabolism of microorganisms and improves the removal of pollutants such as COD.

[0067] Step B2: Use a plug-flow aeration tank to control the dissolved oxygen at 2mg / L-3mg / L, maintain the suspended solids concentration of the mixed liquid at 2000mg / L-3000mg / L, and use a vertical flow sedimentation tank with the surface load controlled at 0.8-1.2m 3 / m 2 h. The plug-flow aeration tank combined with the activated sludge process provides precise dissolved oxygen control, contributing to efficient organic matter degradation and ammonia nitrogen nitrification;

[0068] Step B3: Use a dose of 40-60 mJ / cm 2 UV exposure;

[0069] When the second processing threshold ≤ the processing level CLDJ < the third processing threshold, the industrial wastewater is determined to be moderately polluted, and the second processing instruction is executed;

[0070] The specific measures of the second processing instruction are as follows:

[0071] Step C1: Dissolved air flotation (UASB) is used to remove grease and colloids, followed by pre-treatment with dissolved air flotation (DAF). Dissolved air flotation (DAF) can effectively remove grease and colloids from wastewater, reducing the organic load and improving the efficiency of subsequent biological treatment. DAF offers fast separation speeds and short treatment times, enabling rapid oil removal. The UASB reactor has a high processing capacity and is capable of treating high-concentration organic wastewater. The residence time is moderate, preventing excessive or short treatment times from impacting the treatment effect.

[0072] Step C2: Use A 2After the / O process is used for treatment, the microbial attachment area is increased. Combining the anaerobic, anoxic and aerobic stages, the functions of simultaneous denitrification and phosphorus removal are achieved, effectively removing nutrients such as nitrogen and phosphorus from the wastewater, reducing eutrophication pollution to the water body. The combined filler has a large specific surface area, providing sufficient microbial attachment sites, increasing the contact area between microorganisms and wastewater, and improving treatment efficiency.

[0073] Step C3: Add 50mg / L-100mg / L of polyaluminium chloride and 0.5mg / L-1mg / L of polyacrylamide to form flocs and precipitate them, reducing the suspended solids content in the water to less than 30mg / L. Then use column fixed bed activated carbon to adsorb the residual organic matter, and control the air velocity at 2-4h. -1 Polyaluminium chloride (PAC) and polyacrylamide (PAM) are used as coagulants to form a large number of flocs, effectively removing SS and some organic matter in the wastewater, and reducing the turbidity and chromaticity of the effluent. The columnar fixed-bed activated carbon has a strong adsorption capacity and can effectively remove residual organic matter and odor substances in the wastewater, improving the water quality and safety of the effluent.

[0074] When the third processing threshold ≤ the processing level CLDJ < the fourth processing threshold, the industrial wastewater is determined to be highly polluted, and the third processing instruction is executed;

[0075] The specific measures of the third processing instruction are as follows:

[0076] Step D1: Using Fenton's reagent to remove some organic matter through oxidation reaction, sodium sulfide is added and coagulation treatment is performed. Fenton's reagent has strong oxidizing properties and can effectively remove refractory organic matter and some inorganic matter in the wastewater, reducing the COD concentration. Sodium sulfide acts as a precipitant and can form stable precipitates with various heavy metal ions, effectively removing heavy metal pollutants in the wastewater;

[0077] Step D2: Anaerobic ammonium oxidation (ANAMMOX) is carried out in a sequencing batch reactor at a temperature controlled at 30-35°C. A PVDF hollow fiber membrane with a pore size of 0.1 μm is then used for solid-liquid separation and organic matter removal. The batch reactor provides excellent reaction conditions, enabling ANAMMOX bacteria to efficiently remove total nitrogen and reduce nitrogen pollution. The PVDF hollow fiber membrane has high-precision separation performance and can effectively intercept harmful substances such as suspended solids, bacteria, and viruses in the wastewater, ensuring the effluent quality.

[0078] Step D3: 80-120 mg / L of TiO2 / γ-Al2O3 catalyst is added to reduce COD, and desalination is performed using a spiral membrane module at an operating pressure of 1.5-2.5 MPa. The use of the TiO2 / γ-Al2O3 catalyst improves ozone utilization efficiency, reduces operating costs and energy consumption, and the spiral membrane module has the ability to efficiently desalinate and remove dissolved solids, and can effectively remove pollutants such as inorganic salts, heavy metal ions, and small organic molecules from wastewater.

[0079] Step 3: During the execution of step 2, when operating the device stored in the first processing instruction, the second processing instruction, or the third processing instruction, the device status is monitored.

[0080] Step 3 During the execution of step 2, when operating the device stored in the first processing instruction, the second processing instruction, or the third processing instruction, the specific steps for monitoring the device status are as follows:

[0081] Step E1: Read the error code of any device. When any device reports an error, set the corresponding error weight value to 1;

[0082] Step E2: Based on the error weight of any device, calculate the overall comprehensive weight ZTZHQZ. When the overall comprehensive weight ZTZHQZ exceeds the overall risk threshold, dispatch staff to perform maintenance. The specific expression for calculating the overall comprehensive weight ZTZHQZ in step E2 is as follows:

[0083] ZTZHQZ=∑BCQX

[0084] Among them, BCQX represents the error weight of any device, and ∑BCQX represents the error weight of any device. The staff determines the priority and performs maintenance based on the size of the overall comprehensive weight;

[0085] In addition, the size of the threshold in the present invention is set to facilitate comparison. The size of the threshold depends on the amount of sample data and the base number set by technical personnel in this field for each set of sample data. As long as it does not affect the proportional relationship between the parameter and the quantized value, it can be determined by technical personnel in this field based on each sample data and multiple rounds of experimental processes.

[0086] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. Highly efficient recycling of industrial wastewater deep purification process, characterized by: The following steps are involved: Step 1: Perform comprehensive multi-parameter calculation on the incoming industrial wastewater to obtain the treatment grade CLDJ; Step 2: Determine the processing level and execute the corresponding processing instructions, including: When the first processing threshold ≤ the processing level CLDJ < the second processing threshold, the industrial wastewater is determined to be low-polluting, and the first processing instruction is executed; When the second processing threshold ≤ the processing level CLDJ < the third processing threshold, the industrial wastewater is determined to be moderately polluted, and the second processing instruction is executed; When the third processing threshold ≤ the processing level CLDJ < the fourth processing threshold, the industrial wastewater is determined to be highly polluted, and the third processing instruction is executed; Step 3: During the execution of step 2, when operating the device stored in the first processing instruction, the second processing instruction, or the third processing instruction, the device status is monitored.

2. The high-efficiency recycled industrial wastewater deep purification process according to claim 1 is characterized by: In step 1, the specific steps for calculating the grade of the incoming industrial wastewater and obtaining the treatment grade CLDJ are as follows: Step A1: Obtaining the physical and chemical parameters of industrial wastewater entering the collection tank and a historical industrial wastewater database, wherein the physical and chemical parameters specifically include COD value, conductivity, and heavy metal value. The historical industrial wastewater database stores the COD value, conductivity, and heavy metal value of each industrial wastewater treatment; Step A2: pre-processing the physical and chemical parameters collected from multiple sampling points; Step A3: The physical and chemical parameters collected at multiple sampling points after pretreatment are respectively calculated with the historical discharge values of COD value, conductivity and heavy metal value of industrial wastewater treatment stored in the historical industrial wastewater database, and finally the treatment grade CLDJ is obtained.

3. The high-efficiency recycling industrial wastewater deep purification process according to claim 2 is characterized in that: The specific expression for pre-processing the physical and chemical parameters collected at multiple sampling points in step A2 is as follows: Among them, x represents any one element among COD value, conductivity and heavy metal value, YCL x Represents the preprocessed value of the xth element, N x Indicates the number of sampling points of the xth element, n x Indicates the nth x sampling points, n x ∈1,N x , Indicates the nth x The sampling value of the sampling point, Indicates total N x The sample values of the sampling points are summed.

4. The high-efficiency recycled industrial wastewater deep purification process according to claim 3 is characterized by: In step A3, the physical and chemical parameters collected at the multiple sampling points after pretreatment are respectively calculated with the historical discharge values of COD value, conductivity and heavy metal value of industrial wastewater treatment stored in the historical industrial wastewater database to finally obtain the specific expression of the treatment level CLDJ as follows: Among them, x represents any one element among COD value, conductivity and heavy metal value, YCL x,0 Represents the historical emission value of the xth element, YCL x Represents the preprocessing value of the xth element, CLDJ represents the processing level, Indicates the sum of the x-th element.

5. The process for highly efficient recycling of industrial wastewater according to claim 1, characterized in that: The historical emission value YCL of the xth element x,0 The expression is as follows: Among them, YCL x,0 represents the historical emission value of the xth element, represents the historical emission mean of the x-th element, and maxLSYCL represents the maximum value of the historical emission sampling of the x-th element.

6. The high-efficiency recycling industrial wastewater deep purification process according to claim 1 is characterized by: The specific measures of the first processing instruction are as follows: Step B1: Use a grid with a pore size of 5mm-10mm to intercept the suspended matter, set the residence time to 4-6 hours, and adjust the pH to neutral; Step B2: Use a plug-flow aeration tank to control the dissolved oxygen at 2mg / L-3mg / L, maintain the suspended solids concentration of the mixed liquid at 2000mg / L-3000mg / L, and use a vertical flow sedimentation tank with the surface load controlled at 0.8-1.2m 3 / m 2 ·h; Step B3: Use a dose of 40-60 mJ / cm 2 of ultraviolet radiation.

7. The high-efficiency recycling industrial wastewater deep purification process according to claim 1 is characterized by: The specific measures of the second processing instruction are as follows: Step C1: Remove grease and colloids using dissolved air flotation technology, followed by pre-treatment with UASB; Step C2: After treatment using the A2 / O process, the microbial attachment area is increased; Step C3: Add 50mg / L-100mg / L of polyaluminium chloride and 0.5mg / L-1mg / L of polyacrylamide to form flocs and precipitate them, reducing the suspended solids content in the water to less than 30mg / L. Then use column fixed bed activated carbon to adsorb the residual organic matter, and control the air velocity at 2-4h. -1 .

8. The high-efficiency, recycled, deep purification process for industrial wastewater according to claim 1, characterized in that: The specific measures of the third processing instruction are as follows: Step D1: using Fenton's reagent to remove some organic matter through oxidation reaction, adding sodium sulfide and performing coagulation treatment; Step D2: Anaerobic ammonium oxidation was performed in a sequencing batch reactor at a temperature of 30-35°C, followed by solid-liquid separation and organic matter removal using a 0.1 μm pore size PVDF hollow fiber membrane; Step D3: 80-120 mg / L of TiO2 / γ-Al2O3 catalyst is added to reduce COD, and desalination is performed using a spiral membrane assembly at an operating pressure of 1.5-2.5 MPa.

9. The high-efficiency recycling industrial wastewater deep purification process according to claim 1 is characterized by: In the step 3, during the execution of step 2, when operating the device stored in the first processing instruction, the second processing instruction, or the third processing instruction, the specific steps of monitoring the device status are as follows: Step E1: Read the error code of any device. When any device reports an error, set the corresponding error weight value to 1; Step E2: Based on the error weight of any device, calculate the overall comprehensive weight ZTZHQZ. When the overall comprehensive weight ZTZHQZ exceeds the overall risk threshold, dispatch staff to perform maintenance.

10. The high-efficiency recycling industrial wastewater deep purification process according to claim 9, characterized in that: The specific expression for calculating the overall comprehensive weight ZTZHQZ in step E2 is as follows: BCQX represents the error weight of any device, and ∑BCQX represents the sum of the error weights of any device.

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