Industrial wastewater treatment system

Abstract

The invention discloses an industrial wastewater treatment system, and relates to the field of wastewater treatment, and the system comprises a monitoring module which is used for monitoring whether a wastewater parameter in a wastewater treatment process reaches a target discharge value in real time, obtaining a monitoring result of the wastewater parameter, monitoring an operation parameter of the system and system energy consumption corresponding to the operation parameter, the operation parameters and monitoring results of the system energy consumption corresponding to the operation parameters are obtained; the control module is used for adjusting the wastewater parameters according to the system operation condition and the monitoring result of the wastewater parameters; and the optimization module is used for optimizing and adjusting the operation parameters according to the operation parameters and the monitoring results of the system energy consumption corresponding to the operation parameters. According to the invention, the pH value and COD content of the wastewater can reach the target emission value, and the energy consumption of the system is reduced by optimizing and adjusting the operating parameters.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater treatment, in particular to an industrial wastewater treatment system. Background Art

[0002] Industrial wastewater treatment system refers to the system for treating and recycling industrial wastewater. At present, the main way of recycling industrial wastewater is to treat and recycle industrial wastewater. Focusing on the bottlenecks and difficulties in the whole recycling process, we will strengthen collaborative research and innovate high-efficiency recycling equipment technology and process to become an effective practical solution.

[0003] In recent years, my country has made some achievements in the field of industrial wastewater treatment. A series of industrial wastewater treatment technologies have been developed and put into practice, the discharge volume has been reduced year by year, the treatment rate has been increased year by year, and the discharge intensity has gradually decreased. However, due to the large variety of industrial wastewater, high technical requirements, and great management difficulties, the existing industrial wastewater treatment technology still has many problems. For example, the industrial wastewater treatment rate in some second-tier cities and small and medium-sized cities is still at a low level; some enterprises do not pay enough attention to industrial wastewater treatment. When industrial wastewater is discharged, the pH value and COD content of the wastewater still exceed the standard. The discharge standards are not perfect, and there is a lack of effective supervision and management measures; the industrial wastewater treatment technology used by some enterprises is not advanced enough, the treatment effect is not ideal, and the system consumes a lot of energy; some enterprises do not invest enough in industrial wastewater treatment.

[0004] Therefore, how to make the pH value and COD content of industrial wastewater reach the target discharge value when it is discharged, and reduce the energy consumption of the wastewater treatment system are technical problems that need to be solved. Summary of the invention

[0005] In view of the problems existing in the prior art, the present invention is proposed.

[0006] To solve the above technical problems, the present invention provides the following technical solutions: an industrial wastewater treatment system, comprising: a detection module for real-time monitoring whether wastewater parameters in the wastewater treatment process reach target emission values, and obtaining monitoring results of wastewater parameters, monitoring system operating parameters and system energy consumption corresponding to the operating parameters, and obtaining monitoring results of operating parameters and system energy consumption corresponding to the operating parameters; and a control module for adjusting wastewater parameters according to system operating conditions and monitoring results of wastewater parameters; and an optimization module for optimizing and adjusting operating parameters according to monitoring results of operating parameters and system energy consumption corresponding to the operating parameters.

[0007] As a preferred solution of the industrial wastewater treatment system of the present invention, wherein: the control module is used to determine the performance level of the wastewater treatment equipment according to the stability of the system operation condition, and determine the treatment efficiency threshold of the wastewater treatment equipment according to the performance level of the wastewater treatment equipment;

[0008] The wastewater parameters include wastewater pH value and COD concentration;

[0009] Detect the pH value of the current wastewater to determine whether the pH in the wastewater can be neutralized with each other. If the pH in the wastewater cannot be neutralized with each other and the pH value of the current wastewater does not reach the target discharge value, determine the concentration of the reagent to be added based on the difference between the pH value of the current wastewater and the target pH discharge value, determine the first treatment efficiency of the wastewater treatment equipment based on the concentration of the reagent to be added, and adjust the concentration of the reagent to be added based on the difference between the first treatment efficiency of the wastewater and the treatment efficiency threshold.

[0010] As a preferred solution of the industrial wastewater treatment system of the present invention, wherein: the control module is used to detect the concentration of COD in the current wastewater, if the concentration of COD in the current wastewater does not reach the target discharge value, the concentration of the oxidant to be added is determined according to the difference between the current COD concentration and the target discharge value of COD, and the second treatment efficiency of the wastewater treatment equipment is determined according to the concentration of the oxidant to be added;

[0011] Increase the hydraulic load of the system and add an oxidant of a determined concentration to react. If the COD concentration in the wastewater is still higher than the target discharge value when the hydraulic load reaches the hydraulic load threshold, adjust the operating temperature of the system and adjust the concentration of the oxidant to be added according to the difference between the second treatment efficiency of the wastewater treatment equipment and the treatment efficiency threshold.

[0012] As a preferred solution of the industrial wastewater treatment system described in the present invention, it also includes a confirmation module, which is used to select different types of coagulants, and under the same environmental conditions, test the solubility, temperature sensitivity and corrosiveness of each type of coagulant in water. Different properties represent different scores, and the scores corresponding to the different properties of each type of coagulant are recorded respectively. The comprehensive scores of the three properties of each type of coagulant are calculated respectively, and the coagulant category with the highest comprehensive score is selected.

[0013] As a preferred solution of the industrial wastewater treatment system of the present invention, the determination module is also used to adjust the concentration of the coagulant according to the quality of the wastewater. During the wastewater sedimentation process, when suspended matter appears, the concentration of the coagulant is fine-tuned according to the concentration of the suspended matter.

[0014] Add the adjusted coagulant to the wastewater, and after a period of sedimentation, detect the sedimentation effect at this time and determine whether the sedimentation effect at this time reaches the target sedimentation effect. If the sedimentation effect at this time still does not reach the target sedimentation effect, adjust the concentration of the coagulant according to the difference between the sedimentation effect at this time and the target sedimentation effect; use the adjusted coagulant concentration as the coagulant concentration when the sedimentation effect is optimal.

[0015] As a preferred solution of the industrial wastewater treatment system described in the present invention, the optimization module is used to determine whether the system energy consumption corresponding to the current sludge concentration is higher than the preset system minimum energy consumption. If the system energy consumption corresponding to the current sludge concentration is higher than the preset system minimum energy consumption, the sludge concentration and sludge return flow rate are adjusted.

[0016] As a preferred solution of the industrial wastewater treatment system described in the present invention, the adjustment of sludge concentration and sludge return flow rate includes presetting a sludge concentration threshold and a second sludge return flow rate threshold, and calculating a first sludge return flow rate threshold corresponding to the sludge concentration threshold based on the sludge concentration threshold.

[0017] As a preferred solution of the industrial wastewater treatment system of the present invention, the aeration volume and water inflow of the aeration tank are increased. After the system has been running for a period of time, if the first threshold value of the sludge return flow rate is higher than the second threshold value of the sludge return flow rate, the second threshold value of the sludge return flow rate is used as the sludge return flow rate value to be controlled by the system, and the sludge concentration corresponding to the second return flow rate threshold is calculated according to the second return flow rate threshold, and the sludge concentration is adjusted to the sludge concentration corresponding to the second return flow rate threshold;

[0018] If the first sludge return flow rate threshold is lower than the second sludge return flow rate threshold, the first sludge return flow rate threshold is used as the sludge return flow rate value to be controlled by the system, and the sludge concentration is adjusted to the sludge concentration threshold.

[0019] As a preferred solution of the industrial wastewater treatment system of the present invention, wherein: the calculation of the first threshold of the sludge return flow rate corresponding to the sludge concentration threshold according to the sludge concentration threshold includes:

[0020] Calculate the sedimentation ratio based on the sludge concentration threshold,

[0021] SV=MLSS*SVI

[0022] Among them, MLSS represents sludge concentration, SV represents settling ratio, and SVI represents sludge volume index;

[0023] The reflux ratio is calculated based on the sedimentation ratio.

[0024]

[0025] Wherein, R represents the sludge return ratio.

[0026] As a preferred solution of the industrial wastewater treatment system of the present invention, wherein: the first threshold value of the sludge return flow rate is calculated according to the return ratio,

[0027] L=DR

[0028] Among them, L represents the sludge return volume, and D represents the water inflow into the aeration tank.

[0029] Beneficial effects of the present invention: The present invention provides an industrial wastewater treatment system, which includes a monitoring module for real-time monitoring whether the wastewater parameters in the wastewater treatment process reach the target discharge value, and obtaining the monitoring results of the wastewater parameters, for monitoring the system's operating parameters and the system energy consumption corresponding to the operating parameters, and obtaining the operating parameters and the monitoring results of the system energy consumption corresponding to the operating parameters; a control module for adjusting the wastewater parameters according to the system operating conditions and the monitoring results of the wastewater parameters; an optimization module for optimizing and adjusting the operating parameters according to the monitoring results of the operating parameters and the system energy consumption corresponding to the operating parameters. The present invention can make the pH value and COD content of the wastewater reach the target discharge value, and reduce the system energy consumption by optimizing and adjusting the operating parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0031] Figure 1 It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0033] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0034] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0035] The present application embodiment provides an industrial wastewater treatment system, such as Figure 1 As shown, specifically,

[0036] The monitoring module is used to monitor in real time whether the wastewater parameters in the wastewater treatment process have reached the target discharge value, and obtain the monitoring results of the wastewater parameters, and to monitor the operating parameters of the system and the system energy consumption corresponding to the operating parameters, and obtain the monitoring results of the operating parameters and the system energy consumption corresponding to the operating parameters;

[0037] A control module is used to adjust wastewater parameters according to system operating conditions and monitoring results of wastewater parameters;

[0038] The optimization module is used to optimize and adjust the operating parameters according to the monitoring results of the operating parameters and the system energy consumption corresponding to the operating parameters.

[0039] In some embodiments of the present application, the control module is used to:

[0040] Determine the performance level of the wastewater treatment equipment according to the stability of the system operation conditions, and determine the treatment efficiency threshold of the wastewater treatment equipment according to the performance level of the wastewater treatment equipment;

[0041] Wastewater parameters include wastewater pH and COD concentration;

[0042] Detect the pH value of the current wastewater to determine whether the acidity and alkalinity in the wastewater can be neutralized with each other. If the acidity and alkalinity in the wastewater cannot be neutralized with each other, and the pH value of the current wastewater does not reach the target discharge value, determine the concentration of the reagent to be added according to the difference between the pH value of the current wastewater and the target discharge value of the pH, determine the first treatment efficiency of the wastewater treatment equipment according to the concentration of the reagent to be added, and adjust the concentration of the reagent to be added according to the difference between the first treatment efficiency of the wastewater and the treatment efficiency threshold.

[0043] In this embodiment, the higher the stability of the system operation condition, the higher the performance level of the wastewater treatment equipment. Water treatment equipment with different performance levels corresponds to a treatment efficiency threshold. The higher the performance level of the equipment, the higher the treatment efficiency threshold.

[0044] In this embodiment, the type of reagent is acid or alkali. The addition of acid or alkali is determined according to the pH test result of the wastewater. Different reagent concentrations correspond to different wastewater treatment efficiencies. The higher the reagent concentration, the higher the wastewater treatment efficiency.

[0045] It should be noted that the concentration of the agent should not be too high or too low. Too high or too low concentration of the agent will make the pH value of the wastewater too high or too low, which will reduce the wastewater treatment efficiency. Therefore, when adjusting the concentration of the agent, the actual pH value of the wastewater must also be considered.

[0046] In some embodiments of the present application, the control module is used to:

[0047] Detecting the concentration of COD in the current wastewater, if the concentration of COD in the current wastewater does not reach the target discharge value, determining the concentration of the oxidant to be added according to the difference between the current COD concentration and the target discharge value of COD, and determining the second treatment efficiency of the wastewater treatment equipment according to the concentration of the oxidant to be added;

[0048] Increase the hydraulic load of the system and add an oxidant of a determined concentration to react. If the COD concentration in the wastewater is still higher than the target emission value when the hydraulic load reaches the hydraulic load threshold, adjust the operating temperature of the system and adjust the concentration of the oxidant to be added according to the difference between the second treatment efficiency of the wastewater treatment equipment and the treatment efficiency threshold.

[0049] In this embodiment, COD and the oxidant undergo oxidation reaction in a certain ratio, so the concentration of the corresponding oxidant can be determined according to the concentration of COD. Different concentrations of the oxidant correspond to different equipment processing efficiencies. The higher the oxidant concentration, the faster the reaction rate and the higher the equipment processing efficiency.

[0050] In this embodiment, the greater the hydraulic load, the higher the COD removal rate, but if the hydraulic load is too high, it will cause excessive sludge loss, thereby reducing the COD removal rate. Therefore, when adjusting the hydraulic load of the system, the hydraulic load threshold corresponds to a maximum COD removal rate. If the COD concentration is still higher than the target emission value when the hydraulic load reaches the load threshold, other factors affecting the COD concentration need to be adjusted, such as the operating temperature of the system, to reduce the COD emission value.

[0051] In some embodiments of the present application, a determination module is further included, which is used to:

[0052] Select different types of coagulants and test their solubility, temperature sensitivity and corrosiveness in water under the same environmental conditions. Different properties represent different scores. Record the scores corresponding to the different properties of each type of coagulant, calculate the comprehensive scores of these three properties of each type of coagulant and select the coagulant category with the highest comprehensive score.

[0053] In this embodiment, the same coagulant has different precipitation effects under different environmental conditions. Different coagulants under the same environmental conditions have different performances for different properties, and the effects of coagulants in assisting precipitation are also different. In actual situations, it is necessary to comprehensively consider the different properties of coagulants. Therefore, in the wastewater treatment process, it is necessary to determine the coagulant with the highest comprehensive properties, that is, the best precipitation effect, to assist precipitation, so as to improve the treatment efficiency of the equipment and reduce the energy consumption of the system.

[0054] In some embodiments of the present application, the determination module is used to:

[0055] Adjust the concentration of coagulant according to the quality of wastewater. When suspended solids appear during wastewater sedimentation, fine-tune the concentration of coagulant according to the concentration of suspended solids.

[0056] Add the adjusted coagulant to the wastewater, and after settling for a period of time, detect the sedimentation effect at this time and determine whether the sedimentation effect at this time reaches the target sedimentation effect. If the sedimentation effect at this time still does not reach the target sedimentation effect, adjust the concentration of the coagulant according to the difference between the sedimentation effect at this time and the target sedimentation effect;

[0057] The adjusted coagulant concentration is taken as the coagulant concentration when the precipitation effect is optimal.

[0058] In this embodiment, different coagulant concentrations correspond to different sedimentation effects. The higher the coagulant concentration, the better the treatment effect. However, too high a concentration will lead to problems such as sludge bulking. Therefore, the coagulant concentration needs to be adjusted according to the actual water quality during the sedimentation process to determine the coagulant concentration for the best sedimentation effect. The worse the water quality, the higher the coagulant concentration required.

[0059] In some embodiments of the present application, the optimization module is used to:

[0060] Determine whether the system energy consumption corresponding to the current sludge concentration is higher than the preset system minimum energy consumption. If the system energy consumption corresponding to the current sludge concentration is higher than the preset system minimum energy consumption, adjust the sludge concentration and sludge return flow rate.

[0061] In this embodiment, in order to reduce the energy consumption of the system, it is necessary to reduce and optimize the operating parameters. The operating parameters of the wastewater treatment system include sludge concentration, aeration time, aeration volume, aeration tank water inflow, sludge return flow rate, etc.

[0062] In some embodiments of the present application, adjusting the sludge concentration and the sludge return flow rate includes:

[0063] A sludge concentration threshold and a second sludge return flow rate threshold are preset, and a first sludge return flow rate threshold corresponding to the sludge concentration threshold is calculated according to the sludge concentration threshold;

[0064] Increase the aeration volume and water inflow of the aeration tank. After the system has been running for a period of time, if the first threshold value of the sludge return flow rate is higher than the second threshold value of the sludge return flow rate, the second threshold value of the sludge return flow rate is used as the sludge return flow rate value to be controlled by the system. The sludge concentration corresponding to the second return flow rate threshold is calculated according to the second return flow rate threshold, and the sludge concentration is adjusted to the sludge concentration corresponding to the second return flow rate threshold.

[0065] If the first sludge return flow rate threshold is lower than the second sludge return flow rate threshold, the first sludge return flow rate threshold is used as the sludge return flow rate value to be controlled by the system, and the sludge concentration is adjusted to the sludge concentration threshold.

[0066] In this embodiment, the sludge concentration refers to the content of suspended solids in the mixed liquor at the outlet of the aeration tank. The greater the water inflow and aeration volume of the aeration tank, the lower the sludge concentration and the lower the system energy consumption. Different sludge concentrations correspond to different sedimentation ratios, different sedimentation ratios correspond to different reflow ratios, and different reflow ratios correspond to different reflow flow rates. The smaller the sludge concentration, the smaller the sedimentation ratio, the larger the reflow ratio, and the larger the reflow flow rate.

[0067] In this embodiment, the sludge concentration threshold is the lowest concentration of sludge within the adjustable range, and the first sludge return flow rate threshold is the maximum sludge return flow rate within the adjustable range. When the sludge concentration is the lowest, the corresponding sludge return flow rate is the largest, so the sludge concentration threshold corresponds to the first sludge return flow rate threshold; as the sludge return flow rate increases, the system energy consumption first decreases and then increases, so there is a sludge return flow rate, and the corresponding system energy consumption is the minimum, and this sludge return flow rate is the second sludge return flow rate threshold;

[0068] In this embodiment, while reducing the sludge flow rate, the sludge return flow rate will change accordingly. Therefore, it is necessary to reduce the sludge concentration as much as possible while also comprehensively considering the impact of the change in sludge return flow rate on the system energy consumption.

[0069] In some embodiments of the present application, calculating the first threshold of the sludge return flow rate corresponding to the sludge concentration threshold according to the sludge concentration threshold includes:

[0070] Calculate the sedimentation ratio based on the sludge concentration threshold,

[0071] SV=MLSS*SVI

[0072] Among them, MLSS represents sludge concentration, SV represents settling ratio, and SVI represents sludge volume index;

[0073] The reflux ratio is calculated based on the sedimentation ratio.

[0074]

[0075] Wherein, R represents the sludge return ratio;

[0076] Calculate the first threshold of sludge return flow rate according to the return ratio,

[0077] L=DR

[0078] Among them, L represents the sludge return volume, and D represents the water inflow into the aeration tank.

[0079] In this embodiment, the sludge return flow rate corresponding to the sludge concentration can be calculated and determined by the conversion formula of the sedimentation ratio and the return ratio.

[0080] In some embodiments of the present application, when the system energy consumption corresponding to the sludge concentration is higher than the preset system minimum energy consumption, the following methods are used to replace the adjustment of the sludge concentration and the sludge return flow rate to reduce the system energy consumption:

[0081] Extend the aeration time and increase the number of dosing points of the aeration system. Determine the aeration control efficiency based on the extended aeration time and the number of increased dosing points. Adjust the aeration control efficiency by the optimization degree of the air volume control system. Determine the system energy consumption based on the adjusted aeration control efficiency.

[0082] In this embodiment, the aeration control efficiency can be improved by increasing the addition points, extending the aeration time, etc., thereby improving the aeration control efficiency and reducing the waste of oxygen, thereby reducing the air volume and reducing energy consumption.

[0083] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangement, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0084] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0085] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0086] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. An industrial wastewater treatment system, characterized in that: include, A detection module for real-time monitoring of whether wastewater parameters in the wastewater treatment process have reached the target discharge value and obtaining monitoring results of the wastewater parameters, monitoring system operating parameters and system energy consumption corresponding to the operating parameters, and obtaining monitoring results of the operating parameters and system energy consumption corresponding to the operating parameters; as well as, A control module for adjusting wastewater parameters according to system operating conditions and monitoring results of wastewater parameters; as well as, An optimization module is used to optimize and adjust the operating parameters according to the monitoring results of the operating parameters and the system energy consumption corresponding to the operating parameters.

2. The industrial wastewater treatment system according to claim 1, characterized in that: The control module is used to determine the performance level of the wastewater treatment equipment according to the stability of the system operation conditions, and determine the treatment efficiency threshold of the wastewater treatment equipment according to the performance level of the wastewater treatment equipment; The wastewater parameters include wastewater pH value and COD concentration; Detect the pH value of the current wastewater to determine whether the pH in the wastewater can be neutralized with each other. If the pH in the wastewater cannot be neutralized with each other and the pH value of the current wastewater does not reach the target discharge value, determine the concentration of the reagent to be added based on the difference between the pH value of the current wastewater and the target pH discharge value, determine the first treatment efficiency of the wastewater treatment equipment based on the concentration of the reagent to be added, and adjust the concentration of the reagent to be added based on the difference between the first treatment efficiency of the wastewater and the treatment efficiency threshold.

3. The industrial wastewater treatment system according to claim 2, characterized in that: The control module is used to detect the concentration of COD in the current wastewater. If the concentration of COD in the current wastewater does not reach the target emission value, the concentration of the oxidant to be added is determined according to the difference between the current COD concentration and the target emission value of COD, and the second treatment efficiency of the wastewater treatment equipment is determined according to the concentration of the oxidant to be added; Increase the hydraulic load of the system and add an oxidant of a determined concentration to react. If the COD concentration in the wastewater is still higher than the target discharge value when the hydraulic load reaches the hydraulic load threshold, adjust the operating temperature of the system and adjust the concentration of the oxidant to be added according to the difference between the second treatment efficiency of the wastewater treatment equipment and the treatment efficiency threshold.

4. The industrial wastewater treatment system according to claim 3, characterized in that: It also includes a confirmation module, which is used to select different types of coagulants. Under the same environmental conditions, the solubility, temperature sensitivity and corrosiveness of each type of coagulant in water are tested respectively. Different properties represent different scores. The scores corresponding to the different properties of each type of coagulant are recorded respectively, and the comprehensive scores of the three properties of each type of coagulant are calculated respectively, and the coagulant category with the highest comprehensive score is selected.

5. The industrial wastewater treatment system according to claim 4, characterized in that: The determination module is also used to adjust the concentration of the coagulant according to the quality of the wastewater. During the wastewater sedimentation process, when suspended matter appears, the concentration of the coagulant is fine-tuned according to the concentration of the suspended matter. Add the adjusted coagulant to the wastewater, and after a period of sedimentation, detect the sedimentation effect at this time and determine whether the sedimentation effect at this time reaches the target sedimentation effect. If the sedimentation effect at this time still does not reach the target sedimentation effect, adjust the concentration of the coagulant according to the difference between the sedimentation effect at this time and the target sedimentation effect; use the adjusted coagulant concentration as the coagulant concentration when the sedimentation effect is optimal.

6. The industrial wastewater treatment system according to claim 1, characterized in that: The optimization module is used to determine whether the system energy consumption corresponding to the current sludge concentration is higher than the preset system minimum energy consumption. If the system energy consumption corresponding to the current sludge concentration is higher than the preset system minimum energy consumption, the sludge concentration and the sludge return flow rate are adjusted.

7. The industrial wastewater treatment system according to claim 6, characterized in that: The adjusting of the sludge concentration and the sludge return flow rate includes presetting a sludge concentration threshold and a second sludge return flow rate threshold, and calculating a first sludge return flow rate threshold corresponding to the sludge concentration threshold according to the sludge concentration threshold.

8. The industrial wastewater treatment system according to claim 7, characterized in that: Increase the aeration volume and water inflow of the aeration tank. After the system has been running for a period of time, if the first threshold value of the sludge return flow rate is higher than the second threshold value of the sludge return flow rate, the second threshold value of the sludge return flow rate is used as the sludge return flow rate value to be controlled by the system, and the sludge concentration corresponding to the second return flow rate threshold is calculated according to the second return flow rate threshold, and the sludge concentration is adjusted to the sludge concentration corresponding to the second return flow rate threshold; If the first sludge return flow rate threshold is lower than the second sludge return flow rate threshold, the first sludge return flow rate threshold is used as the sludge return flow rate value to be controlled by the system, and the sludge concentration is adjusted to the sludge concentration threshold.

9. The industrial wastewater treatment system according to claim 8, characterized in that: The method of calculating the first sludge return flow rate threshold value corresponding to the sludge concentration threshold value according to the sludge concentration threshold value includes: Calculate the sedimentation ratio based on the sludge concentration threshold, SV=MLSS*SVI Among them, MLSS represents sludge concentration, SV represents settling ratio, and SVI represents sludge volume index; The reflux ratio is calculated based on the sedimentation ratio. Wherein, R represents the sludge return ratio.

10. The industrial wastewater treatment system according to claim 9, characterized in that: Calculate the first threshold of sludge return flow rate according to the return ratio, L=DR Among them, L represents the sludge return volume, and D represents the water inflow into the aeration tank.

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