Electroplating wastewater online reclaimed water reuse system and control method

Abstract

The invention relates to the technical field of electroplating wastewater treatment, in particular to an electroplating wastewater online reclaimed water recycling system and a control method. According to the invention, through real-time calculation of a dynamic adjustment value, accurate linkage of the membrane cleaning frequency and the chemical agent dosage is realized, so that the service life of the reverse osmosis membrane is prolonged, meanwhile, agent waste is reduced, and a priority ranking unit based on real-time detection of heavy metal concentration is used for realizing real-time detection of the heavy metal concentration. The system adjusts the working pressure and the backwashing frequency of the membrane treatment module according to the priority from high to low so as to ensure that the high-concentration heavy metal wastewater is treated preferentially, and in addition, by arranging an intelligent flow prediction module and a dynamic adjustment module, the predicted drainage flow is compared with a preset flow peak threshold value, so that the high-concentration heavy metal wastewater can be treated preferentially. The working pressure of the reverse osmosis membrane group and the real-time power of the water pump are dynamically adjusted, and meanwhile, the start-stop strategy of the water pump is implemented by calculating the energy consumption efficiency index, so that the purposes of quickly responding to flow fluctuation and reducing system energy consumption are achieved, and meanwhile, the stable water quality of reuse water is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of electroplating wastewater treatment, and more specifically, to an on-line intermediate water reuse system and control method for electroplating wastewater. Background Art

[0002] With the acceleration of the industrialization process, the electroplating industry, as an important part of the manufacturing industry, the problem of wastewater generated during its production process has become increasingly prominent. Electroplating wastewater contains pollutants such as heavy metal ions (such as precious metals like copper, nickel, silver, gold, etc.), organic substances, and inorganic salts. If directly discharged into the sewage treatment station without discrimination, it will not only cause a great waste of precious metal resources, but also increase the enterprise's wastewater treatment cost, and at the same time bring a serious burden to the environment.

[0003] With the rapid development of the electroplating industry, the wastewater treatment of precision electroplating production lines faces severe challenges. Existing electroplating wastewater reuse systems have the following key defects when dealing with high-concentration heavy metals and complex working conditions:

[0004] 1. Insufficient coordination and optimization between membrane cleaning and chemical agent dosing: In traditional systems, the cleaning cycle of the membrane treatment module and the dosing amount of chemical agents are usually set fixedly, lacking a dynamic linkage mechanism. For example, when the heavy metal concentration in the wastewater suddenly increases, the membrane fouling rate accelerates, but the dosing amount of the agent fails to be adjusted synchronously, resulting in increased scaling on the membrane surface. At the same time, the membrane cleaning operation is often initiated passively after severe fouling, unable to match the cleaning frequency according to the real-time fouling degree, causing rapid attenuation of the membrane flux and excessive dosing of the agent. This independent operation mode not only increases the maintenance cost but also reduces the overall treatment efficiency of the system.

[0005] 2. Lack of a mechanism for preferentially treating high-concentration heavy metal wastewater: Existing technologies lack a hierarchical treatment strategy for heavy metal pollution in wastewater at different concentrations. When high-concentration wastewater and low-concentration wastewater are treated together, the high-concentration heavy metal ions will rapidly consume the effective components of the chemical agents, resulting in insufficient agents for treating low-concentration wastewater and a decrease in the comprehensive removal rate. In addition, the failure to preferentially treat high-concentration wastewater causes serious loss of precious metals during the mixing and dilution process, with insufficient recovery rate, resulting in resource waste and economic losses.

[0006] 3. Poor adaptability to intermittent drainage conditions: Precision electroplating production lines often adopt pulsed drainage (concentrated drainage 3 - 5 times per hour). Traditional continuous flow systems are difficult to quickly respond to flow fluctuations. When high-concentration wastewater surges in instantaneously, the membrane treatment module is prone to blockage due to sudden changes in load, while during low-flow periods, energy consumption is wasted due to idling. This operation mode increases the system energy consumption and the quality of the recycled water is unstable. Summary of the Invention

[0007] The purpose of the present invention is to provide an on-line intermediate water reuse system and control method for electroplating wastewater, so as to solve the problems of insufficient collaborative optimization of membrane cleaning and chemical agent dosing, lack of high-concentration heavy metal wastewater priority treatment mechanism, and poor adaptability to intermittent drainage conditions in the existing electroplating wastewater reuse system as proposed in the above background technology.

[0008] To achieve the above object, the present invention aims to provide an on-line intermediate water reuse system for electroplating wastewater, the system includes a data acquisition module, a pretreatment module, an intelligent control module and a membrane treatment module;

[0009] The data acquisition module is used to collect the heavy metal ion concentration , value, wastewater temperature and instantaneous flow rate ;

[0010] The pretreatment module includes a chemical reduction unit and a flocculation precipitation unit, which are used for preliminary treatment of the wastewater;

[0011] The membrane treatment module includes a reverse osmosis membrane group and a nanofiltration membrane group, which are used for deep removal of pollutants. The reverse osmosis membrane group includes a main reverse osmosis membrane group and a standby reverse osmosis membrane group, and both the main reverse osmosis membrane group and the standby reverse osmosis membrane group include a high-pressure membrane group and a low-pressure membrane group;

[0012] The intelligent control module is used to receive the data of the data acquisition module, calculate the dynamic adjustment value of wastewater treatment , and by comparing with the preset threshold value, control the coordinated operation of the pretreatment module and the membrane treatment module, specifically:

[0013] Set the standard treatment efficiency as , and according to the formula , calculate the real-time treatment efficiency , where is the standard value of the heavy metal concentration, is the standard value of the value, is the flow standard value;

[0014] Preset the dynamic adjustment threshold , and according to the formula , calculate the dynamic adjustment value of wastewater treatment , where is the temperature standard value;

[0015] When > , control the membrane treatment module to start the corresponding pulse cleaning mode and adjust the dosing amount of the chemical reducing agent.

[0016] As a further improvement of this technical solution, the intelligent control module further includes a priority sorting unit, which is used to calculate the treatment priority according to the types of heavy metals and adjust the treatment order of the membrane treatment module from high to low priority. Specifically:

[0017] Set the weight coefficient according to the types of heavy metals ;

[0018] According to the formula , calculate the treatment priority , where is the concentration of the th type of heavy metal;

[0019] Adjust the working pressure and backwashing frequency of the membrane treatment module from high to low priority.

[0020] As a further improvement of this technical solution, the specific control logic of the pulse cleaning mode of the membrane treatment module is as follows:

[0021] When > 1.5 , start high-frequency pulse cleaning, with a frequency ≥ 10 times / minute;

[0022] When < ≤ 1.5 , start medium-frequency pulse cleaning, with a frequency of 5 - 10 times / minute;

[0023] When ≤ , maintain low-frequency pulse cleaning, with a frequency ≤ 5 times / minute.

[0024] As a further improvement of this technical solution, the system further includes a recycled water quality monitoring module, which is used to detect the conductivity of the recycled water and the concentration of microorganisms in real time, and adjust the operating parameters of the membrane treatment module through a feedback mechanism. Specifically:

[0025] Preset the maximum allowable threshold of the conductivity of the recycled water and the maximum allowable threshold of the concentration of microorganisms in the recycled water ;

[0026] If > , or > , then trigger a system alarm and switch to the standby reverse osmosis membrane module.

[0027] As a further improvement of this technical solution, the system further includes an intelligent flow prediction module, which is used to based on historical drainage data and instantaneous flow rate , according to the formula , calculate the predicted drainage flow rate within the next 10 minutes , where is the average flow rate collected every 10 minutes within the past 24 hours.

[0028] As a further improvement of this technical solution, the system further includes a dynamic adjustment module for comparing the calculated predicted drainage flow rate with a preset flow peak threshold , and dynamically adjusting the working pressure of the reverse osmosis membrane module and the real-time power of the water pump. Specifically:

[0029] When the predicted drainage flow rate exceeds the preset flow peak threshold , start the high-pressure membrane module in advance;

[0030] When the predicted drainage flow rate ≤0.5 , switch to the energy-saving mode, that is, turn off 50% of the reverse osmosis membrane modules and reduce the water pump power to 60%.

[0031] As a further improvement of this technical solution, the dynamic adjustment module is also used to calculate the energy consumption efficiency index , and implement the water pump start-stop strategy according to the energy consumption efficiency index . Specifically:

[0032] Preset the minimum efficiency threshold and the maximum efficiency threshold , according to the formula , calculate the energy consumption efficiency index , where is the real-time power of the water pump;

[0033] When < , turn off the redundant water pumps and switch to the small flow mode;

[0034] When > , start the standby water pump and increase the flow rate to the peak processing capacity.

[0035] The present invention also provides a control method for an online intermediate water reuse system for electroplating wastewater, including the following steps:

[0036] Use the data acquisition module to collect the heavy metal ion concentration of electroplating wastewater , value, wastewater temperature and instantaneous flow rate , and calculate the dynamic adjustment value of wastewater treatment through the intelligent control module When > , the membrane treatment module is controlled to start the corresponding pulse cleaning mode, and the dosing amount of the chemical reducing agent is adjusted. At the same time, the priority sorting unit calculates the treatment priority and adjusts the working pressure and backwashing frequency of the membrane treatment module from high to low according to the priority;

[0037] The conductivity of the recycled water is detected in real time through the recycled water quality monitoring module and the microorganism concentration , and the operating parameters of the membrane treatment module are adjusted through the feedback mechanism;

[0038] Based on the historical drainage data and the instantaneous flow rate , the intelligent flow prediction module calculates the predicted drainage flow rate within the next 10 minutes , and the calculated predicted drainage flow rate is used by the dynamic adjustment module to be compared with the preset flow peak threshold , and the working pressure of the reverse osmosis membrane module and the real-time power of the water pump are dynamically adjusted. At the same time, the energy consumption efficiency index is calculated by the dynamic adjustment module , and the start-stop strategy of the water pump is implemented according to the energy consumption efficiency index .

[0039] Compared with the prior art, the beneficial effects of the present invention are:

[0040] 1. In the present invention, through the real-time calculation of the dynamic adjustment value, the precise linkage between the membrane cleaning frequency and the dosing amount of the chemical agent is realized. When the heavy metal concentration in the wastewater suddenly increases, the system automatically increases the pulse cleaning frequency and synchronously increases the dosing amount of the reducing agent, effectively inhibiting the fouling on the membrane surface, thereby prolonging the service life of the reverse osmosis membrane and reducing the waste of the agent at the same time.

[0041] 2. In the present invention, based on the priority sorting unit for real-time detection of the heavy metal concentration, the system adjusts the working pressure and backwashing frequency of the membrane treatment module from high to low according to the priority, ensuring the priority treatment of the high-concentration heavy metal wastewater, thereby improving the nickel recovery rate in the high-concentration wastewater and significantly improving the resource utilization efficiency.

[0042] 3. In the present invention, by setting the intelligent flow prediction module and the dynamic adjustment module, based on the comparison between the predicted drainage flow rate and the preset flow peak threshold, the working pressure of the reverse osmosis membrane module and the real-time power of the water pump are dynamically adjusted. At the same time, the start-stop strategy of the water pump is implemented by calculating the energy consumption efficiency index, so as to achieve the purpose of quickly responding to the flow fluctuation and reducing the system energy consumption, while ensuring the stable quality of the recycled water. Description of the Drawings

[0043] Figure 1This is the schematic diagram of the principle of the on-line intermediate water reuse system for electroplating wastewater of the present invention.

[0044] Figure 2 This is the schematic diagram of the operation process of the intelligent control module of the on-line intermediate water reuse system for electroplating wastewater of the present invention. Specific embodiments

[0045] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0046] In a specific embodiment, the production line of an electroplating factory discharges wastewater 3 times per hour, the instantaneous flow rate fluctuates in the range of 5-15 m³ / h, and the nickel ion concentration in the wastewater ranges from 50 to 200 mg / L. The system needs to treat the wastewater in real time to ensure that the conductivity of the recycled water ≤ 50 , the nickel recovery rate ≥ 95%, and at the same time reduce energy consumption.

[0047] As Figure 1 shown, an on-line intermediate water reuse system for electroplating wastewater includes a data acquisition module, a pretreatment module, an intelligent control module, a membrane treatment module, a recycled water quality monitoring module, an intelligent flow prediction module, and a dynamic adjustment module.

[0048] The data acquisition module is used to collect the heavy metal ion concentration , pH value, wastewater temperature T, and instantaneous flow rate of electroplating wastewater in real time.

[0049] The data collected in real time is as follows:

[0050] Nickel ion concentration = 180 mg / L (standard value = 100 mg / L);

[0051] pH value is 3.5 (standard value = 6.0);

[0052] Wastewater temperature T = 35 °C (standard value = 25 °C);

[0053] Instantaneous flow rate = 12 m 3 / h (standard value = 10 m 3 / h).

[0054] The pretreatment module includes a chemical reduction unit and a flocculation precipitation unit for preliminarily treating wastewater.

[0055] The chemical reduction unit adds ferrous sulfate to reduce hexavalent chromium to trivalent chromium.

[0056] The flocculation precipitation unit adds polyaluminum chloride to form flocculent precipitates to remove suspended solids.

[0057] The membrane treatment module includes a reverse osmosis membrane group and a nanofiltration membrane group for deeply removing pollutants. The reverse osmosis membrane group includes a main reverse osmosis membrane group and a standby reverse osmosis membrane group, and both the main reverse osmosis membrane group and the standby reverse osmosis membrane group include a high-pressure membrane group and a low-pressure membrane group.

[0058] As Figure 2 shown, the intelligent control module is used to receive the data from the data acquisition module, calculate the dynamic adjustment value of wastewater treatment , and control the coordinated operation of the pretreatment module and the membrane treatment module by comparing with the preset threshold. The specific steps are as follows:

[0059] Set the standard treatment efficiency as = 1.0, and calculate the real-time treatment efficiency according to the formula ;

[0060] Preset the dynamic adjustment threshold = 1.0, and calculate the dynamic adjustment value of wastewater treatment according to the formula ;

[0061] = 0.364 < = 1.0, so maintain the low-frequency pulse cleaning with a frequency ≤ 5 times / minute.

[0062] When > , control the membrane treatment module to start the corresponding pulse cleaning mode and adjust the dosage of the chemical reducing agent (synchronously increase the dosage of the chemical reducing agent to 1.2 times the standard value to inhibit membrane fouling).

[0063] Meanwhile, the specific control logic of the pulse cleaning mode is as follows:

[0064] When > 1.5 , start the high-frequency pulse cleaning with a frequency ≥ 10 times / minute;

[0065] When < ≤ 1.5 , start the medium-frequency pulse cleaning with a frequency of 5 - 10 times / minute;

[0066] When ≤ maintain low-frequency pulse cleaning with a frequency ≤ 5 times / minute.

[0067] The intelligent control module further includes a priority sorting unit, which is used to calculate the treatment priority according to the heavy metal types and adjust the treatment order of the membrane treatment module from high to low priority. Specifically:

[0068] Set weight coefficients according to heavy metal types The weight coefficient of nickel = 0.8, the weight coefficient of copper = 0.5, the weight coefficient of zinc = 0.3;

[0069] According to the formula calculate the treatment priority where is the concentration of the th heavy metal;

[0070] Adjust the working pressure and backwash frequency of the membrane treatment module from high to low priority, that is, give priority to treating nickel-containing wastewater, increase the working pressure of the reverse osmosis membrane module to 8 bar, and increase the backwash frequency to once every 30 minutes.

[0071] The recycled water quality monitoring module continuously detects the conductivity = 50 and the microorganism concentration = 50 of the recycled water, and adjusts the operating parameters of the membrane treatment module through a feedback mechanism. The specific steps are as follows:

[0072] Preset the maximum allowable threshold of the conductivity of the recycled water = 50 and the maximum allowable threshold of the microorganism concentration of the recycled water = 100 ;

[0073] Since < = 50 , = 50 < = 100 the water quality meets the standard, and the system maintains the current operating parameters.

[0074] If > , or > , then trigger a system alarm and switch to the standby reverse osmosis membrane module.

[0075] The intelligent flow prediction module is based on historical drainage data (where is the average flow rate collected every 10 minutes within the past 24 hours, and the value here is 10) and the instantaneous flow rate , and according to the formula , calculate the predicted drainage flow rate within the next 10 minutes .

[0076] The dynamic adjustment module compares the calculated predicted drainage flow rate = 10.6m 3 / h with the preset flow peak threshold = 12m 3 / h, and dynamically adjusts the working pressure of the reverse osmosis membrane module and the real-time power of the water pump:

[0077] At this time, because = 10.6m 3 / h < = 12m 3 / h, so maintain the current operation of the high-pressure membrane module and keep the water pump power.

[0078] When the predicted drainage flow rate exceeds the preset flow peak threshold , start the high-pressure membrane module in advance;

[0079] When the predicted drainage flow rate ≤ 0.5 , switch to the energy-saving mode, that is, turn off 50% of the reverse osmosis membrane modules and reduce the water pump power to 60%.

[0080] At the same time, the dynamic adjustment module is also used to calculate the energy consumption efficiency index , and implement the water pump start-stop strategy according to the energy consumption efficiency index . The specific steps are as follows:

[0081] Preset the minimum efficiency threshold and the maximum efficiency threshold , and according to the formula , calculate the energy consumption efficiency index , where is the real-time power of the water pump;

[0082] When < , turn off the redundant water pumps and switch to the small-flow mode;

[0083] When > , start the standby water pump and increase the flow rate to the peak processing capacity.

[0084] In summary, through the real-time calculation of the dynamic adjustment value, the present invention realizes the precise linkage between the membrane cleaning frequency and the chemical agent dosage. When the heavy metal concentration in the wastewater suddenly increases, the system automatically increases the pulse cleaning frequency and simultaneously increases the dosage of the reducing agent, effectively inhibiting fouling on the membrane surface, thereby extending the service life of the reverse osmosis membrane and reducing chemical agent waste. At the same time, based on the priority sorting unit for real-time detection of heavy metal concentration, the system adjusts the working pressure and backwashing frequency of the membrane treatment module from high to low according to the priority, ensuring the priority treatment of high-concentration heavy metal wastewater, thereby improving the nickel recovery rate in high-concentration wastewater and significantly enhancing the resource utilization efficiency. In addition, by setting the intelligent flow prediction module and the dynamic adjustment module, comparing the predicted drainage flow with the preset flow peak threshold, dynamically adjusting the working pressure of the reverse osmosis membrane group and the real-time power of the water pump, and implementing the water pump start-stop strategy by calculating the energy consumption efficiency index, the purpose of quickly responding to flow fluctuations and reducing system energy consumption is achieved, while ensuring the stable quality of the recycled water.

[0085] In another specific embodiment, a control method for an on-line intermediate water reuse system for electroplating wastewater includes the following steps: Using a data acquisition module to collect the heavy metal ion concentration of electroplating wastewater 、 value, wastewater temperature and instantaneous flow rate , and calculating the dynamic adjustment value of wastewater treatment through an intelligent control module . When > , control the membrane treatment module to start the corresponding pulse cleaning mode, adjust the dosage of the chemical reducing agent, and at the same time use the priority sorting unit to calculate the treatment priority , and adjust the working pressure and backwashing frequency of the membrane treatment module from high to low according to the priority;

[0086] Real-time detect the conductivity of the recycled water and the microorganism concentration through the recycled water quality monitoring module, and adjust the operating parameters of the membrane treatment module through the feedback mechanism;

[0087] Using the intelligent flow prediction module based on historical drainage data and instantaneous flow rate , calculate the predicted drainage flow within the next 10 minutes , and use the dynamic adjustment module to compare the calculated predicted drainage flow with the preset flow peak threshold , dynamically adjust the working pressure of the reverse osmosis membrane group and the real-time power of the water pump, and at the same time use the dynamic adjustment module to calculate the energy consumption efficiency index , and according to the energy consumption efficiency index Implement the water pump start-stop strategy.

[0088] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. An online water reuse system for electroplating wastewater, characterized in that: The system includes a data acquisition module, a pre-processing module, an intelligent control module and a membrane processing module; The data acquisition module is used to collect the heavy metal ion concentration of electroplating wastewater in real time , Value, wastewater temperature And instantaneous flow ; The pretreatment module includes a chemical reduction unit and a flocculation sedimentation unit, which are used to perform preliminary treatment on the wastewater; The membrane treatment module includes a reverse osmosis membrane group and a nanofiltration membrane group, which are used to deeply remove pollutants. The reverse osmosis membrane group includes a main reverse osmosis membrane group and a spare reverse osmosis membrane group. The main reverse osmosis membrane group and the spare reverse osmosis membrane group both include a high-pressure membrane group and a low-pressure membrane group. The intelligent control module is used to receive data from the data acquisition module and calculate the dynamic adjustment value of wastewater treatment , and by comparing with the preset threshold, the coordinated operation of the pretreatment module and the membrane treatment module is controlled, specifically: Set the standard processing efficiency to , and according to the formula , calculate real-time processing efficiency ,in is the standard value of heavy metal concentration, for The standard value of the value, is the standard value of flow rate; Preset dynamic adjustment threshold , and according to the formula , calculate the dynamic adjustment value of wastewater treatment ,in is the standard value of temperature; when > When the pulse cleaning mode is activated, the membrane treatment module is controlled to start the corresponding pulse cleaning mode and adjust the dosage of the chemical reducing agent.

2. The electroplating wastewater online water reuse system according to claim 1 is characterized in that: The intelligent control module further includes a priority sorting unit, which is used to calculate the processing priority according to the type of heavy metals and adjust the processing order of the membrane processing modules from high to low according to the priority, specifically: Set weight coefficients according to heavy metal types ; According to the formula , calculate processing priority ,in For the The concentration of heavy metals; Adjust the operating pressure and backwash frequency of the membrane treatment module from high to low priority.

3. The electroplating wastewater online water reuse system according to claim 1 is characterized in that: The specific control logic of the pulse cleaning mode of the membrane treatment module is as follows: when >1.5 When the high-frequency pulse cleaning is started, the frequency is ≥ 10 times / minute; when < ≤1.5 When the medium frequency pulse cleaning is started, the frequency is 5-10 times / minute; when ≤ When cleaning, maintain low-frequency pulse cleaning, with a frequency of ≤5 times / minute.

4. The electroplating wastewater online water reuse system according to claim 1 is characterized in that: The system also includes a recycled water quality monitoring module for real-time detection of the conductivity of recycled water. and microbial concentration The operating parameters of the membrane treatment module are adjusted through the feedback mechanism, specifically: Preset the maximum allowable threshold value of recycled water conductivity and the maximum permissible threshold of microbial concentration in recycled water ; like > ,or > , the system alarm is triggered and switches to the backup reverse osmosis membrane group.

5. The electroplating wastewater online water reuse system according to claim 1 is characterized in that: The system also includes an intelligent traffic prediction module and a dynamic adjustment module. The intelligent flow prediction module is used to predict the flow based on historical drainage data. and instantaneous flow , according to the formula , calculate the predicted drainage flow in the next 10 minutes ,in It is the average flow rate collected every 10 minutes in the past 24 hours; The dynamic adjustment module is used to calculate the predicted drainage flow With the preset traffic peak threshold For comparison, the working pressure of the reverse osmosis membrane group and the real-time power of the water pump are dynamically adjusted as follows: When the drainage flow is predicted Exceeding the preset traffic peak threshold When the high pressure membrane group is started in advance; When the drainage flow is predicted ≤0.5 When the water level drops to zero, it switches to energy-saving mode, shutting down 50% of the reverse osmosis membrane groups and reducing the water pump power to 60%.

6. The electroplating wastewater online water reuse system according to claim 5 is characterized in that: The dynamic adjustment module is also used to calculate the energy efficiency index , and according to the energy efficiency index Implement the pump start and stop strategy, specifically: Preset minimum efficiency threshold and the maximum efficiency threshold , according to the formula , calculate the energy efficiency index ,in The real-time power of the water pump; when < When the redundant water pump is turned off and switched to low flow mode; when > When the water level reaches the peak, start the backup pump and increase the flow rate to the peak processing capacity.

7. The control method of the online water reuse system for electroplating wastewater according to any one of claims 1 to 6, characterized in that: The following steps are involved: Using data acquisition module to collect heavy metal ion concentration of electroplating wastewater , Value, wastewater temperature And instantaneous flow And calculate the dynamic adjustment value of wastewater treatment through the intelligent control module ,when > When the membrane treatment module is controlled to start the corresponding pulse cleaning mode, and adjust the dosage of the chemical reducing agent, and use the priority sorting unit to calculate the treatment priority , and adjust the working pressure and backwashing frequency of the membrane treatment module from high to low priority; Real-time detection of recycled water conductivity through recycled water quality monitoring module and microbial concentration and adjust the operating parameters of the membrane treatment module through a feedback mechanism; Using intelligent flow prediction module based on historical drainage data and instantaneous flow , calculate the predicted drainage flow in the next 10 minutes , and use the dynamic adjustment module to calculate the predicted drainage flow With the preset traffic peak threshold Compare and dynamically adjust the working pressure of the reverse osmosis membrane group and the real-time power of the water pump, and use the dynamic adjustment module to calculate the energy efficiency index , and according to the energy efficiency index Implement pump start and stop strategies.

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