Energy-saving and environment-friendly sewage treatment system for iron and steel plant

Abstract

The invention relates to the technical field of sewage treatment, and discloses a steel plant energy-saving and environment-friendly sewage treatment system, which comprises a data monitoring module, a data acquisition module, a data analysis module, a sewage evaluation module and a sewage management module, the data acquisition module is used for acquiring data, the data analysis module is used for calculating the water pollution severity P1, the sewage treatment efficiency V1 and the sewage discharge qualified index Zl, and the sewage evaluation module draws up a water pollution grade standard line according to historical data of an iron and steel plant and then judges the sewage treatment grade, the chemical adding type and the treatment flow according to the water pollution severity P1. Whether the sewage is discharged to the next stage or the self-circulation stage is judged according to the sewage treatment efficiency V1, whether the sewage is directly discharged or enters the self-circulation stage is judged according to the sewage discharge qualified index Zl, and finally the management module issues an optimization instruction to the data monitoring module, the data acquisition module and the data analysis module.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, and in particular to an energy-saving and environmentally friendly sewage treatment system for a steel plant. Background Art

[0002] In the prior art, the wastewater treatment process of steel mills is unclear and inefficient. Traditional treatment systems may not be able to accurately classify and analyze wastewater from different sources, resulting in a lack of pertinence and effectiveness in the treatment process. For example, the sewage from the circulating cooling water system, desalted water, softened water, and concentrated brine produced by pure water production facilities, as well as wastewater generated in various production processes, if these sewage of different natures are not properly classified and pre-treated, and directly enter the subsequent treatment link, it will increase the difficulty of treatment and reduce the overall efficiency. In addition, the lack of in-depth analysis and understanding of the composition of sewage also makes it difficult to select the most appropriate treatment technology and methods, thereby affecting the treatment effect and the realization of environmental protection goals. Therefore, the development of an energy-saving and environmental protection system that can clearly classify and efficiently treat wastewater in steel mills is of great significance to improving environmental quality and increasing resource utilization. Summary of the invention

[0003] 1. Technical issues to be resolved

[0004] In view of the shortcomings of the prior art, the present invention provides an energy-saving and environmentally friendly sewage treatment system for a steel plant, which has the advantages of an automated and clear process and high sewage treatment efficiency, and solves the problems of unclear sewage treatment process and low sewage treatment efficiency in the prior art.

[0005] (II) Technical solution

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an energy-saving and environmentally friendly sewage treatment system for a steel plant, comprising a data monitoring module, a data acquisition module, a data analysis module, a sewage assessment module and a sewage management module;

[0007] The data monitoring module monitors the steel plant data online by using monitoring equipment and sensors, and the data monitoring module is connected to the data acquisition module through a network;

[0008] The data acquisition module includes a steel plant wastewater source data unit, a steel plant wastewater treatment data unit and a steel plant wastewater discharge data unit. The steel plant wastewater source data unit is connected to the steel plant data terminal through the Internet of Things to obtain the steel plant wastewater source data. The steel plant wastewater treatment data unit obtains the steel plant wastewater treatment data through online monitoring equipment, online testing instruments and the steel plant laboratory Internet of Things terminal. The steel plant wastewater discharge data unit obtains the steel plant wastewater discharge data through online monitoring equipment, online testing instruments, the steel plant laboratory Internet of Things terminal and the factory drainage index. The steel plant wastewater source data unit, the steel plant wastewater treatment data unit and the steel plant wastewater discharge data unit are connected to the data analysis module through the network;

[0009] The data analysis module includes a steel plant wastewater classification unit, a steel plant wastewater analysis unit and a steel plant wastewater discharge comprehensive unit, wherein the steel plant wastewater classification unit calculates the water pollution severity Pl according to the steel plant wastewater source data, the steel plant wastewater analysis unit calculates the wastewater treatment efficiency Vl according to the steel plant wastewater treatment data, and the steel plant wastewater discharge comprehensive unit calculates the wastewater discharge qualification index Zl according to the steel plant wastewater discharge data, and the steel plant wastewater classification unit, the steel plant wastewater analysis unit and the steel plant wastewater discharge comprehensive unit are connected to the wastewater assessment module through a network;

[0010] The sewage assessment module formulates a water pollution level standard line based on the historical data of the steel plant, and then determines the sewage treatment level, the type of dosing and the treatment process according to the water pollution severity Pl. The sewage assessment module determines whether the sewage is discharged to the next stage or to the self-circulation stage according to the sewage treatment efficiency Vl. The sewage assessment module determines whether the sewage is directly discharged or enters the self-circulation stage according to the sewage discharge qualification index Zl. The sewage assessment module communicates with the sewage management module through the network;

[0011] The sewage management module issues optimization instructions to the data monitoring module, the data acquisition module and the data analysis module according to the evaluation results of the sewage evaluation module.

[0012] Preferably, the steel plant wastewater source data includes wastewater from the circulating cooling water system, desalted water, softened water and concentrated brine produced by pure water production facilities, as well as wastewater data generated by various processes in the steel plant during production operations. The data are counted and numbered, and the circulating cooling water system wastewater, desalted water, softened water and concentrated brine produced by pure water production facilities, as well as wastewater data generated by various processes in the steel plant during production operations are numbered Q1, Q2, Q3, and Q4, respectively.

[0013] Preferably, the steel plant wastewater treatment data includes detection data of a pretreatment tank, a physical tank, a chemical tank and a microbial tank, which are statistically analyzed and numbered. The detection data of the pretreatment tank, the physical tank, the chemical tank and the microbial tank are numbered X1, X2, X3 and X4 respectively.

[0014] Preferably, the wastewater discharge data of the steel plant includes the wastewater monitoring data of the microbial pool outlet pipeline and the wastewater discharge inlet monitoring data, which are statistically analyzed and numbered. The wastewater monitoring data of the microbial pool outlet pipeline and the wastewater discharge inlet monitoring data are numbered H, ... c , H r .

[0015] Preferably, the steel plant wastewater classification unit calculates the water pollution severity Pl according to the steel plant wastewater source data, and the calculation formula is:

[0016]

[0017] In the formula, Pl represents the severity of water pollution, Q1, Q2, Q3, and Q4 represent the sewage from the circulating cooling water system, desalted water, softened water, and concentrated brine produced by pure water production facilities, as well as the sewage data generated by various processes in the steel plant during production and operation. i It indicates a kind of comprehensive monitoring data of sewage in the sewage treatment data of the steel plant. Qe1, Qe2, Qe3 and Qe4 respectively represent the contents of sewage monitoring indicators corresponding to the sewage discharged from the circulating cooling water system, desalted water, softened water and concentrated brine produced by pure water production facilities, as well as the sewage data generated by each process of the steel plant during production and operation. Qe i It indicates the content of a certain sewage monitoring index in the sewage treatment data of the steel plant. The sewage monitoring index includes pH value, chemical oxygen demand, suspended solids, heavy metal content, i It indicates the weight of a certain sewage monitoring indicator in the severity of water pollution.

[0018] Preferably, the steel plant wastewater analysis unit calculates the wastewater treatment efficiency Vl according to the wastewater treatment data of the steel plant, and the calculation formula is:

[0019]

[0020]

[0021] In the formula, Vl represents the sewage treatment efficiency, Vl1 represents the sewage treatment efficiency of the pretreatment tank, Vl2 represents the sewage treatment efficiency of the physical tank, Vl3 represents the sewage treatment efficiency of the chemical tank, and X1, X2, X3, and X4 represent the detection data of the pretreatment tank, physical tank, chemical tank, and microbial tank, respectively.

[0022] Preferably, the steel plant wastewater discharge comprehensive unit calculates the wastewater discharge qualification index Zl based on the wastewater discharge data of the steel plant, and the calculation formula is:

[0023]

[0024] In the formula, Zl represents the qualified index of sewage discharge, H c , H r They represent the sewage monitoring data of the microbial pool outlet pipeline and the sewage discharge inlet monitoring data respectively.

[0025] Preferably, the sewage assessment module formulates a water pollution level standard line according to the historical data of the steel plant, and then determines the sewage treatment level, the type of dosing and the treatment process according to the severity of water pollution Pl, and the process is as follows:

[0026] When the water pollution severity Pl deviates from the water pollution level standard line by 1 / 10, the sewage treatment level is judged to be level three, and the dosing is performed based on the acidity and alkalinity of the sewage determined by the online pH meter. The treatment process is physical pool, chemical pool and microbial pool;

[0027] When the water pollution severity Pl deviates from the water pollution level standard line by 1 / 5, the sewage treatment level is judged to be level 2, and the acidity and alkalinity of the sewage are judged by the online pH meter. At the same time, the online detection equipment detects the heavy metal content, and then comprehensive treatment and dosing are carried out. The treatment process is physical pool, chemical pool, microbial pool and recycling pool;

[0028] When the water pollution severity Pl deviates from the water pollution level standard line by 1 / 2, the sewage treatment level is judged to be level one, and the acidity and alkalinity of the sewage are determined by the online pH meter. At the same time, the online detection equipment detects the heavy metal content, and the organic matter is measured, and then comprehensive treatment and drug addition are carried out. The treatment process is physical pool, chemical pool, microbial pool and recycling pool.

[0029] Preferably, the sewage evaluation module determines whether the sewage is discharged to the next stage or to the self-circulation stage according to the sewage treatment efficiency V1, and the process is as follows:

[0030] When the sewage treatment efficiency Vl1 is qualified, that is, the sewage treatment efficiency of the pretreatment tank meets the standard, it enters the physical treatment stage; when the sewage treatment efficiency Vl1 is unqualified, it enters the self-circulation stage of the pretreatment tank;

[0031] When the sewage treatment efficiency Vl2 is qualified, that is, the physical pool sewage treatment efficiency is up to standard, it enters the chemical treatment stage; when the sewage treatment efficiency Vl2 is unqualified, it enters the physical pool self-circulation stage;

[0032] When the sewage treatment efficiency Vl3 is qualified, that is, the sewage treatment efficiency of the chemical pool meets the standard, it enters the microbial treatment stage. When the sewage treatment efficiency Vl3 is unqualified, it enters the chemical pool self-circulation stage.

[0033] Preferably, the sewage assessment module determines whether the sewage should be discharged directly or enter the self-circulation stage according to the sewage discharge qualification index Zl, and the process is: when the sewage discharge qualification index Zl is determined to meet the qualification standard, it directly enters the discharge outlet; when the sewage discharge qualification index Zl is determined not to meet the qualification standard, it directly enters the microbial self-circulation inlet.

[0034] Compared with the prior art, the present invention provides an energy-saving and environmentally friendly sewage treatment system for a steel plant, which has the following beneficial effects:

[0035] 1. The present invention calculates the severity of water pollution Pl. The calculation formula integrates the monitoring indicators of pH value, chemical oxygen demand, suspended solids and heavy metal content of various sewage, and obtains the overall severity of water pollution of the steel plant through weighted calculation. The comprehensive evaluation method can more comprehensively reflect the actual situation of water pollution, provide a basic basis for subsequent governance work, and accurately classify and comprehensively evaluate different sewage, which is helpful to optimize the sewage treatment process, reduce unnecessary treatment steps and reagent resource waste, and at the same time, for sewage with a higher degree of pollution, treatment resources and time can be prioritized, thereby improving the overall treatment efficiency.

[0036] 2. The present invention calculates the sewage treatment efficiency Vl and introduces real-time detection data as a variable in the calculation formula. The formula can reflect the efficiency changes of each treatment link (pretreatment tank, physical tank, chemical tank and microbial tank) in real time. The calculation method based on online detection data can improve the evaluation accuracy of the system, so that the sewage evaluation module can update the actual situation of sewage treatment in real time, and formulate corresponding optimization measures accordingly. At the same time, the detection data in the formula changes in real time, so the sewage treatment efficiency Vl can dynamically reflect the changing trend of sewage treatment efficiency. The dynamic nature of this automated monitoring process can not only timely discover problems in the sewage link, but also notify the staff to take corresponding adjustment measures to ensure the stable operation of the sewage treatment system. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the structure of the present invention. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0039] See also Figure 1, an energy-saving and environmentally friendly sewage treatment system for a steel plant, comprising a data monitoring module, a data acquisition module, a data analysis module, a sewage assessment module and a sewage management module;

[0040] The data monitoring module monitors the steel plant data online by using monitoring equipment and sensors, and the data monitoring module is connected to the data acquisition module through the network;

[0041] The data acquisition module includes a steel plant wastewater source data unit, a steel plant wastewater treatment data unit and a steel plant wastewater discharge data unit. The steel plant wastewater source data unit is connected to the steel plant data terminal through the Internet of Things to obtain the steel plant wastewater source data. The steel plant wastewater treatment data unit obtains the steel plant wastewater treatment data through online monitoring equipment, online testing instruments and the steel plant laboratory Internet of Things terminal. The steel plant wastewater discharge data unit obtains the steel plant wastewater discharge data through online monitoring equipment, online testing instruments, the steel plant laboratory Internet of Things terminal and the factory drainage indicators. The steel plant wastewater source data unit, the steel plant wastewater treatment data unit and the steel plant wastewater discharge data unit are connected to the data analysis module through the network;

[0042] The data analysis module includes a steel plant wastewater classification unit, a steel plant wastewater analysis unit and a steel plant wastewater discharge comprehensive unit. The steel plant wastewater classification unit calculates the water pollution severity Pl according to the steel plant wastewater source data. The steel plant wastewater analysis unit calculates the wastewater treatment efficiency Vl according to the steel plant wastewater treatment data. The steel plant wastewater discharge comprehensive unit calculates the wastewater discharge qualification index Zl according to the steel plant wastewater discharge data. The steel plant wastewater classification unit, the steel plant wastewater analysis unit and the steel plant wastewater discharge comprehensive unit are connected to the wastewater assessment module through a network.

[0043] The sewage assessment module formulates a water pollution level standard line based on the historical data of the steel plant, and then determines the sewage treatment level, the type of dosing and the treatment process according to the severity of water pollution Pl. By setting a clear water pollution level standard line and automatically adjusting the sewage treatment level according to the degree of deviation, dynamic regulation of sewage treatment is achieved. At the same time, the acidity and alkalinity of sewage are monitored in real time using an online pH meter to ensure the accuracy and effectiveness of dosing. This data-driven treatment method can improve the efficiency and effectiveness of sewage treatment.

[0044] The sewage evaluation module determines whether the sewage should be discharged to the next stage or the self-circulation stage according to the sewage treatment efficiency Vl. By real-time monitoring and evaluating the sewage treatment efficiency, it can dynamically decide whether the sewage should continue to flow to the next treatment stage or re-enter the current stage of self-circulation. This system automatic protection mechanism ensures that only sewage that reaches the predetermined treatment efficiency can enter the next stage, thereby ensuring the efficiency and stability of the entire sewage treatment process. At the same time, the self-circulation design enables sewage that does not meet the standards to be further treated at the current stage, avoiding the accumulation and amplification of problems.

[0045] The sewage assessment module determines whether the sewage is discharged directly or enters the self-circulation stage according to the sewage discharge qualification index Zl. The sewage assessment module sets a standard assessment link before the sewage is discharged through the network and the sewage management module, and determines whether the sewage can be discharged directly according to the discharge qualification index. When the sewage does not meet the discharge standard, it will automatically enter the self-circulation stage for reprocessing. The dynamic design of this system not only ensures that all discharged sewage meets environmental protection requirements, but also improves the intelligence level of the sewage treatment system through a closed-loop feedback mechanism;

[0046] The sewage management module issues optimization instructions to the data monitoring module, data acquisition module and data analysis module according to the evaluation results of the sewage evaluation module.

[0047] The data on the sources of wastewater from steel mills include wastewater from the circulating cooling water system, desalted water, softened water, and concentrated brine produced by pure water production facilities, as well as wastewater data generated by various processes in the production process of the steel mill. The data are counted and numbered, and the data on wastewater from the circulating cooling water system, desalted water, softened water, and concentrated brine produced by pure water production facilities, as well as wastewater data generated by various processes in the production process of the steel mill are numbered Q1, Q2, Q3, and Q4 respectively.

[0048] The advantages are: by making detailed distinctions between wastewater from the circulating cooling water system, desalted water, softened water, concentrated brine produced by pure water production facilities, and wastewater generated in each production process, it helps to accurately classify wastewater from different sources in the factory. This classification method helps the sewage pool to adopt the most appropriate treatment strategy for sewage of different natures, thereby improving the targetedness and effectiveness of the treatment.

[0049] The wastewater treatment data of the steel plant includes the detection data of the pretreatment tank, physical tank, chemical tank and microbial tank, which are counted and numbered. The detection data of the pretreatment tank, physical tank, chemical tank and microbial tank are numbered X1, X2, X3 and X4 respectively.

[0050] The wastewater discharge data of the steel plant includes the monitoring data of the wastewater in the outlet pipeline of the microbial pool and the monitoring data of the inlet of the wastewater discharge. The data are counted and numbered. The monitoring data of the wastewater in the outlet pipeline of the microbial pool and the monitoring data of the inlet of the wastewater discharge are numbered H c , H r .

[0051] The steel plant wastewater classification unit calculates the water pollution severity Pl based on the steel plant wastewater source data. The calculation formula is:

[0052]

[0053] In the formula, Pl represents the severity of water pollution, Q1, Q2, Q3, and Q4 represent the sewage from the circulating cooling water system, desalted water, softened water, and concentrated brine produced by pure water production facilities, as well as the sewage data generated by various processes in the steel plant during production and operation. i It indicates a kind of comprehensive monitoring data of sewage in the sewage treatment data of the steel plant. Qe1, Qe2, Qe3 and Qe4 respectively represent the contents of sewage monitoring indicators corresponding to the sewage discharged from the circulating cooling water system, desalted water, softened water and concentrated brine produced by pure water production facilities, as well as the sewage data generated by each process of the steel plant during production and operation. Qe i It indicates the content of a certain sewage monitoring index in the sewage treatment data of the steel plant. The sewage monitoring index includes pH value, chemical oxygen demand, suspended solids, heavy metal content, i It indicates the weight of a certain sewage monitoring indicator in the severity of water pollution.

[0054] The advantages are: by calculating the water pollution severity Pl, the calculation formula combines the monitoring indicators of pH value, chemical oxygen demand, suspended solids and heavy metal content of various sewage, and obtains the overall water pollution severity of the steel plant through weighted calculation. This comprehensive evaluation method can more comprehensively reflect the actual situation of water pollution and provide a basic basis for subsequent governance work. In addition, by accurately classifying and comprehensively evaluating different sewage, it helps to optimize the sewage treatment process, reduce unnecessary treatment steps and waste of reagent resources. At the same time, for sewage with a higher degree of pollution, treatment resources and time can be prioritized, thereby improving the overall treatment efficiency.

[0055] The steel plant wastewater analysis unit calculates the wastewater treatment efficiency Vl based on the wastewater treatment data of the steel plant. The calculation formula is:

[0056]

[0057] In the formula, Vl represents the sewage treatment efficiency, Vl1 represents the sewage treatment efficiency of the pretreatment tank, Vl2 represents the sewage treatment efficiency of the physical tank, Vl3 represents the sewage treatment efficiency of the chemical tank, and X1, X2, X3, and X4 represent the detection data of the pretreatment tank, physical tank, chemical tank, and microbial tank, respectively.

[0058] The advantages are: by calculating the sewage treatment efficiency Vl, real-time detection data is introduced as a variable in the calculation formula, and the formula can reflect the efficiency changes of each treatment link (pretreatment tank, physical tank, chemical tank and microbial tank) in real time. This calculation method based on online detection data can improve the evaluation accuracy of the system, so that the sewage evaluation module can update the actual situation of sewage treatment in real time, and formulate corresponding optimization measures accordingly. At the same time, the detection data in the formula changes in real time, so the sewage treatment efficiency Vl can dynamically reflect the changing trend of sewage treatment efficiency. The dynamic nature of this automated monitoring process can not only detect problems in the sewage link in time, but also notify the staff to take corresponding adjustment measures to ensure the stable operation of the sewage treatment system.

[0059] The comprehensive unit of wastewater discharge of steel plants calculates the wastewater discharge qualification index Zl based on the wastewater discharge data of steel plants. The calculation formula is:

[0060]

[0061] In the formula, Zl represents the qualified index of sewage discharge, H c , H r They represent the sewage monitoring data of the microbial pool outlet pipeline and the sewage discharge inlet monitoring data respectively.

[0062] The advantages are: by calculating the sewage discharge qualification index Zl, the calculation formula monitors and evaluates two key nodes: the microbial pool outlet pipe and the sewage discharge point, which helps to understand the effect of sewage treatment in a targeted manner. By comparing the data of these two nodes, it can be determined whether the performance of the sewage treatment system is stable and whether further optimization is needed.

[0063] The sewage assessment module formulates the water pollution level standard line based on the historical data of the steel plant, and then determines the sewage treatment level, dosing type and treatment process according to the water pollution severity Pl. The process is as follows:

[0064] When the water pollution severity Pl deviates from the water pollution level standard line by 1 / 10, the sewage treatment level is judged to be level three, and the dosing is performed based on the acidity and alkalinity of the sewage determined by the online pH meter. The treatment process is physical pool, chemical pool and microbial pool;

[0065] When the water pollution severity Pl deviates from the water pollution level standard line by 1 / 5, the sewage treatment level is judged to be level 2, and the acidity and alkalinity of the sewage are judged by the online pH meter. At the same time, the online detection equipment detects the heavy metal content, and then comprehensive treatment and dosing are carried out. The treatment process is physical pool, chemical pool, microbial pool and recycling pool;

[0066] When the water pollution severity Pl deviates from the water pollution level standard line by 1 / 2, the sewage treatment level is judged to be level one, and the acidity and alkalinity of the sewage are determined by the online pH meter. At the same time, the online detection equipment detects the heavy metal content, and the organic matter is measured, and then comprehensive treatment and drug addition are carried out. The treatment process is physical pool, chemical pool, microbial pool and recycling pool.

[0067] The sewage evaluation module determines whether the sewage should be discharged to the next stage or to the self-circulation stage according to the sewage treatment efficiency Vl. The process is as follows:

[0068] When the sewage treatment efficiency Vl1 is qualified, that is, the sewage treatment efficiency of the pretreatment tank meets the standard, it enters the physical treatment stage; when the sewage treatment efficiency Vl1 is unqualified, it enters the self-circulation stage of the pretreatment tank;

[0069] When the sewage treatment efficiency Vl2 is qualified, that is, the physical pool sewage treatment efficiency is up to standard, it enters the chemical treatment stage; when the sewage treatment efficiency Vl2 is unqualified, it enters the physical pool self-circulation stage;

[0070] When the sewage treatment efficiency Vl3 is qualified, that is, the sewage treatment efficiency of the chemical pool meets the standard, it enters the microbial treatment stage. When the sewage treatment efficiency Vl3 is unqualified, it enters the chemical pool self-circulation stage.

[0071] The sewage assessment module determines whether the sewage should be discharged directly or enter the self-circulation stage according to the sewage discharge qualification index Zl. The process is: when the sewage discharge qualification index Zl is judged to meet the qualification standard, it directly enters the discharge outlet; when the sewage discharge qualification index Zl is judged not to meet the qualification standard, it directly enters the microbial self-circulation entrance.

[0072] Although 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 the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An energy-saving and environmentally friendly sewage treatment system for a steel plant, characterized in that: It includes data monitoring module, data acquisition module, data analysis module, sewage assessment module and sewage management module; The data monitoring module monitors the steel plant data online by using monitoring equipment and sensors, and the data monitoring module is connected to the data acquisition module through a network; The data acquisition module includes a steel plant wastewater source data unit, a steel plant wastewater treatment data unit and a steel plant wastewater discharge data unit. The steel plant wastewater source data unit is connected to the steel plant data terminal through the Internet of Things to obtain the steel plant wastewater source data. The steel plant wastewater treatment data unit obtains the steel plant wastewater treatment data through online monitoring equipment, online testing instruments and the steel plant laboratory Internet of Things terminal. The steel plant wastewater discharge data unit obtains the steel plant wastewater discharge data through online monitoring equipment, online testing instruments, the steel plant laboratory Internet of Things terminal and the factory drainage index. The steel plant wastewater source data unit, the steel plant wastewater treatment data unit and the steel plant wastewater discharge data unit are connected to the data analysis module through the network; The data analysis module includes a steel plant wastewater classification unit, a steel plant wastewater analysis unit and a steel plant wastewater discharge comprehensive unit, wherein the steel plant wastewater classification unit calculates the water pollution severity Pl according to the steel plant wastewater source data, the steel plant wastewater analysis unit calculates the wastewater treatment efficiency Vl according to the steel plant wastewater treatment data, and the steel plant wastewater discharge comprehensive unit calculates the wastewater discharge qualification index Zl according to the steel plant wastewater discharge data, and the steel plant wastewater classification unit, the steel plant wastewater analysis unit and the steel plant wastewater discharge comprehensive unit are connected to the wastewater assessment module through a network; The sewage assessment module formulates a water pollution level standard line based on the historical data of the steel plant, and then determines the sewage treatment level, the type of dosing and the treatment process according to the water pollution severity Pl. The sewage assessment module determines whether the sewage is discharged to the next stage or to the self-circulation stage according to the sewage treatment efficiency Vl. The sewage assessment module determines whether the sewage is directly discharged or enters the self-circulation stage according to the sewage discharge qualification index Zl. The sewage assessment module communicates with the sewage management module through the network; The sewage management module issues optimization instructions to the data monitoring module, the data acquisition module and the data analysis module according to the evaluation results of the sewage evaluation module.

2. The energy-saving and environmentally friendly wastewater treatment system for a steel plant according to claim 1 is characterized by: The steel plant wastewater source data includes wastewater from the circulating cooling water system, desalted water, softened water and concentrated brine produced by pure water production facilities, as well as wastewater data generated by various processes in the steel plant during production operations. The data are counted and numbered. The circulating cooling water system wastewater, desalted water, softened water and concentrated brine produced by pure water production facilities, as well as wastewater data generated by various processes in the steel plant during production operations are numbered Q1, Q2, Q3 and Q4 respectively.

3. The energy-saving and environmentally friendly wastewater treatment system for a steel plant according to claim 1 is characterized by: The steel plant wastewater treatment data includes detection data of the pretreatment tank, physical tank, chemical tank and microbial tank, which are statistically analyzed and numbered. The detection data of the pretreatment tank, physical tank, chemical tank and microbial tank are numbered X1, X2, X3 and X4 respectively.

4. The energy-saving and environmentally friendly wastewater treatment system for a steel plant according to claim 1 is characterized by: The wastewater discharge data of the steel plant includes the wastewater monitoring data of the microbial pool outlet pipeline and the inlet monitoring data of the wastewater discharge place, which are statistically analyzed and numbered. The wastewater monitoring data of the microbial pool outlet pipeline and the inlet monitoring data of the wastewater discharge place are numbered H, ... c , H r .

5. The energy-saving and environmentally friendly wastewater treatment system for a steel plant according to claim 1 is characterized by: The steel plant wastewater classification unit calculates the water pollution severity Pl based on the steel plant wastewater source data, and its calculation formula is: In the formula, Pl represents the severity of water pollution, Q1, Q2, Q3, and Q4 represent the sewage from the circulating cooling water system, desalted water, softened water, and concentrated brine produced by pure water production facilities, as well as the sewage data generated by various processes in the steel plant during production and operation. i It indicates a kind of comprehensive monitoring data of sewage in the sewage treatment data of the steel plant. Qe1, Qe2, Qe3 and Qe4 respectively represent the contents of sewage monitoring indicators corresponding to the sewage discharged from the circulating cooling water system, desalted water, softened water and concentrated brine produced by pure water production facilities, as well as the sewage data generated by each process of the steel plant during production and operation. Qe i It indicates the content of a certain sewage monitoring index in the sewage treatment data of the steel plant. The sewage monitoring index includes pH value, chemical oxygen demand, suspended solids, heavy metal content, i It indicates the weight of a certain sewage monitoring indicator in the severity of water pollution.

6. The energy-saving and environmentally friendly wastewater treatment system for a steel plant according to claim 1 is characterized by: The steel plant wastewater analysis unit calculates the wastewater treatment efficiency Vl based on the wastewater treatment data of the steel plant, and the calculation formula is: In the formula, Vl represents the sewage treatment efficiency, Vl1 represents the sewage treatment efficiency of the pretreatment tank, Vl2 represents the sewage treatment efficiency of the physical tank, Vl3 represents the sewage treatment efficiency of the chemical tank, and X1, X2, X3, and X4 represent the detection data of the pretreatment tank, physical tank, chemical tank, and microbial tank, respectively.

7. The energy-saving and environmentally friendly wastewater treatment system for a steel plant according to claim 1 is characterized by: The steel plant wastewater discharge comprehensive unit calculates the wastewater discharge qualification index Zl based on the wastewater discharge data of the steel plant, and its calculation formula is: In the formula, Zl represents the qualified index of sewage discharge, H c , H r They represent the sewage monitoring data of the microbial pool outlet pipeline and the sewage discharge inlet monitoring data respectively.

8. The energy-saving and environmentally friendly wastewater treatment system for a steel plant according to claim 1 is characterized by: The sewage assessment module formulates the water pollution level standard line according to the historical data of the steel plant, and then determines the sewage treatment level, the type of dosing and the treatment process according to the water pollution severity Pl. The process is as follows: When the water pollution severity Pl deviates from the water pollution level standard line by 1 / 10, the sewage treatment level is judged to be level three, and the dosing is performed based on the acidity and alkalinity of the sewage determined by the online pH meter. The treatment process is physical pool, chemical pool and microbial pool; When the water pollution severity Pl deviates from the water pollution level standard line by 1 / 5, the sewage treatment level is judged to be level 2, and the acidity and alkalinity of the sewage are judged by the online pH meter. At the same time, the online detection equipment detects the heavy metal content, and then comprehensive treatment and dosing are carried out. The treatment process is physical pool, chemical pool, microbial pool and recycling pool; When the water pollution severity Pl deviates from the water pollution level standard line by 1 / 2, the sewage treatment level is judged to be level one, and the acidity and alkalinity of the sewage are determined by the online pH meter. At the same time, the online detection equipment detects the heavy metal content, and the organic matter is measured, and then comprehensive treatment and drug addition are carried out. The treatment process is physical pool, chemical pool, microbial pool and recycling pool.

9. The energy-saving and environmentally friendly wastewater treatment system for a steel plant according to claim 1 is characterized by: The sewage evaluation module determines whether the sewage is discharged to the next stage or to the self-circulation stage according to the sewage treatment efficiency V1, and the process is as follows: When the sewage treatment efficiency Vl1 is qualified, that is, the sewage treatment efficiency of the pretreatment tank meets the standard, it enters the physical treatment stage; when the sewage treatment efficiency Vl1 is unqualified, it enters the self-circulation stage of the pretreatment tank; When the sewage treatment efficiency Vl2 is qualified, that is, the physical pool sewage treatment efficiency is up to standard, it enters the chemical treatment stage; when the sewage treatment efficiency Vl2 is unqualified, it enters the physical pool self-circulation stage; When the sewage treatment efficiency Vl3 is qualified, that is, the sewage treatment efficiency of the chemical pool meets the standard, it enters the microbial treatment stage. When the sewage treatment efficiency Vl3 is unqualified, it enters the chemical pool self-circulation stage.

10. The energy-saving and environmentally friendly wastewater treatment system for a steel plant according to claim 1 is characterized by: The sewage evaluation module determines whether the sewage is directly discharged or enters the self-circulation stage according to the sewage discharge qualification index Zl. The process is: when the sewage discharge qualification index Zl is determined to meet the qualification standard, it directly enters the discharge outlet; when the sewage discharge qualification index Zl is determined not to meet the qualification standard, it directly enters the microbial self-circulation inlet.

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