Electroplating wastewater grading treatment system

Abstract

The utility model discloses a kind of electroplating wastewater grading treatment systems, the electroplating wastewater grading treatment system includes: set module, pretreatment module, comprehensive treatment module, depth processing module and residual processing module;The input end pipeline connection of pretreatment module is connected with the output end of collection module;The input end pipeline connection of comprehensive treatment module is connected with the output end of pretreatment module;The input end pipeline connection of depth processing module is connected with the output end of comprehensive treatment module;The input end pipeline connection of residual processing module is connected with the output end of depth processing module, to constitute the overall structure of electroplating wastewater grading treatment system in this way.Electroplating wastewater grading treatment system is collected by quality and special line pretreatment, avoids cross interference of pollutant from source;Again through the organic combination of comprehensive purification and depth processing, not only ensure the efficient removal of pollutant and stable standard reaching, more realize the scale reuse of water resources.

Description

Technical Field

[0001] This utility model relates to the field of electroplating wastewater treatment technology, and in particular to a graded treatment system for electroplating wastewater. Background Technology

[0002] The electroplating industry is an important part of the national economy, but the large amount of wastewater generated during its production process has a complex composition and high pollution load. It contains various heavy metal ions such as cyanide, chromium, copper, nickel, and zinc, as well as pollutants such as acids, alkalis, and organic additives. If it is discharged directly without treatment, it will cause extremely serious harm to the water environment and human health.

[0003] Currently, the treatment of electroplating wastewater generally employs chemical methods. The traditional and widely used approach involves collecting and mixing various types of electroplating wastewater (such as pretreatment wastewater, cyanide-containing wastewater, chromium-containing wastewater, and heavy metal wastewater) and treating them centrally through a "regulation tank—reaction tank—sedimentation tank" process. While this "all-in-one" treatment model is simple in structure and has relatively low initial investment, it has revealed numerous technical drawbacks in actual operation: First, mixing wastewater of different properties can easily lead to complex chemical reactions, interfering with treatment effectiveness. For example, mixing cyanide-containing wastewater with acidic wastewater may produce highly toxic hydrogen cyanide gas, posing a safety hazard; mixing reducing hexavalent chromium wastewater with other wastewater increases the difficulty of subsequent treatment and reagent consumption. Co-precipitation of different heavy metal ions may result in competition or interference, affecting precipitation efficiency and causing fluctuations in the concentration of heavy metal ions in the effluent, making it difficult to consistently meet discharge standards.

[0004] Secondly, traditional processes have poor resource recovery capabilities. A large amount of reusable water resources and valuable metal elements are lost with the sludge, failing to achieve effective recycling. This not only wastes resources but also increases the cost and environmental risks of subsequent sludge disposal. Utility Model Content

[0005] Therefore, it is necessary to provide a graded treatment system for electroplating wastewater to address the technical problem that existing electroplating wastewater treatment systems are insufficient in their ability to treat multiple types of wastewater in parallel.

[0006] A graded treatment system for electroplating wastewater includes a collection module, a pretreatment module, a comprehensive treatment module, a deep treatment module, and a residue treatment module. The input end of the collection module is connected to multiple electroplating production lines for wastewater collection. The input end of the pretreatment module is connected to the output end of the collection module. The input end of the comprehensive treatment module is connected to the output end of the pretreatment module. The input end of the deep treatment module is connected to the output end of the comprehensive treatment module. The input end of the residue treatment module is connected to the output end of the deep treatment module, thus forming the overall structure of the graded treatment system for electroplating wastewater.

[0007] The collection module includes a cyanide collection tank, a chromium collection tank, and a concentrated solution storage tank. The input pipe of the cyanide collection tank is connected to the cyanide electroplating line, and the output pipe of the cyanide collection tank is connected to the pretreatment module. The input pipe of the chromium collection tank is connected to the chromium electroplating line, and the output pipe of the chromium collection tank is connected to the pretreatment module. The input of the concentrated solution storage tank is connected to the electroplating solution concentration tank, and the output pipe of the concentrated solution storage tank is connected to the pretreatment module.

[0008] The pretreatment module includes a first cyanide-breaking tank, a second cyanide-breaking tank, a first reduction tank, and a second reduction tank. The input pipe of the first cyanide-breaking tank is connected to the output of the cyanide-containing collection tank, and the output pipe of the first cyanide-breaking tank is connected to the input of the second cyanide-breaking tank. The output pipe of the second cyanide-breaking tank is connected to the integrated treatment module. The input of the first reduction tank is connected to the chromium-containing collection tank and the concentrated liquid storage tank, respectively, and the output pipe of the first reduction tank is connected to the input of the second reduction tank. The output pipe of the second reduction tank is connected to the integrated treatment module.

[0009] In one embodiment, the collection module further includes a comprehensive collection tank, the input end of which is connected to other electroplating production lines, and the output end of which is connected to a comprehensive processing module.

[0010] In one embodiment, the aforementioned integrated treatment module includes an integrated equalization tank, an inclined tube sedimentation tank, an intermediate water tank, and a sludge storage tank; the input end of the integrated equalization tank is connected to the output end pipes of the second cyanide breaking tank, the second reduction tank, and the integrated collection tank, respectively; the output end pipe of the integrated equalization tank is connected to the input end of the inclined tube sedimentation tank; the output end pipe of the inclined tube sedimentation tank is connected to the input end of the intermediate water tank and the input end of the sludge storage tank; the output end pipe of the intermediate water tank is connected to the input end of the deep treatment module; and the output end pipe of the sludge storage tank is connected to the residue treatment module.

[0011] In one embodiment, the above-mentioned integrated processing module further includes a rapid mixing tank, which is located between the output end of the integrated equalization tank and the input end of the inclined tube sedimentation tank, and connected by pipelines in sequence.

[0012] In one embodiment, the above-mentioned integrated processing module further includes a slow mixing tank, which is located between the output end of the fast mixing tank and the input end of the inclined tube sedimentation tank, and connected by pipelines in sequence.

[0013] In one embodiment, the aforementioned deep treatment module further includes a multi-media filter, an ultrafiltration (UF) system, a reverse osmosis (RO) system, and a reclaimed water tank; the input pipe of the multi-media filter is connected to the input of the intermediate output, and the output pipe of the multi-media filter is connected to the input of the ultrafiltration (UF) system; the output pipe of the ultrafiltration (UF) system is connected to the input of the reverse osmosis (RO) system; the output pipe of the reverse osmosis (RO) system is connected to the input of the reclaimed water tank and the residue treatment module.

[0014] In one embodiment, the aforementioned deep treatment module further includes an RO raw water tank, which is located between the output end of the ultrafiltration (UF) system and the input end of the reverse osmosis (RO) system, and connected by pipelines in sequence.

[0015] In one embodiment, the aforementioned deep treatment module further includes an RO concentrate tank, which is located between the output end of the reverse osmosis (RO) system and the input end of the residue treatment module, and are connected by pipelines in sequence.

[0016] In one embodiment, the aforementioned residue treatment module includes an MVR evaporator and a plate and frame filter press; the input pipe of the MVR evaporator is connected to the output of the RO concentrate tank; the input pipe of the plate and frame filter press is connected to the output of the sludge storage tank, and the output pipe of the plate and frame filter press is connected to the input of the integrated equalization tank.

[0017] In one embodiment, the above-mentioned electroplating wastewater graded treatment system further includes several booster pumps, which are respectively arranged between the cyanide collection tank and the first cyanide breaking tank, between the chromium collection tank and the first reduction tank, between the comprehensive collection tank and the comprehensive adjustment tank, and between the comprehensive adjustment tank and the rapid mixing tank.

[0018] In one embodiment, the above-mentioned electroplating wastewater graded treatment system further includes a metering pump, which is located between the output end of the concentrated liquid storage tank and the input end of the first reduction tank.

[0019] In one embodiment, the above-mentioned electroplating wastewater graded treatment system further includes two screw pumps, which are respectively located between the RO concentrate tank and the MVR evaporator, and between the sludge storage tank and the plate and frame filter press.

[0020] In one embodiment, the above-mentioned electroplating wastewater graded treatment system further includes a booster pump, which is located between the output end of the intermediate water tank and the input end of the multi-media filter.

[0021] In one embodiment, the above-mentioned electroplating wastewater graded treatment system further includes a high-pressure pump, which is located between the output end of the RO raw water tank and the input end of the reverse osmosis RO system.

[0022] The aforementioned electroplating wastewater tiered treatment system, through separate collection and dedicated pretreatment lines, avoids cross-contamination of pollutants at the source, laying a solid foundation for subsequent efficient treatment. Furthermore, the organic combination of comprehensive purification and deep treatment not only ensures efficient removal and stable compliance of pollutants but also enables large-scale water resource reuse. Finally, through residual fine treatment, the ultimate safe disposal of waste is achieved. Specifically, cyanide-containing collection tanks, chromium-containing collection tanks, comprehensive collection tanks, and concentrated solution storage tanks are physically separated at the source of the production line through independent pipeline systems. This separates wastewaters with significantly different properties, completely preventing complex chemical reactions after mixing, which could produce more difficult-to-treat substances or create safety hazards. High-concentration concentrated solutions (waste plating solutions) are collected separately and transported quantitatively, avoiding instantaneous impact loads on the biological or membrane systems, protecting subsequent sensitive treatment units, and ensuring relatively stable water quality and quantity of the comprehensive wastewater, greatly reducing treatment difficulty and the uncertainty of reagent dosage. Dedicated lines are used to specifically and thoroughly decompose highly toxic cyanide. and carcinogenic hexavalent chromium The two-stage processing structure ensures the completeness of the reaction; the first stage oxidizes cyanide into less toxic cyanate. The second stage completely oxidizes it into non-toxic carbon dioxide and nitrogen; the first stage, under acidic conditions,... Reduced to a less toxic form The second stage ensures complete reduction and precipitation. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of a graded treatment system for electroplating wastewater in one embodiment. Detailed Implementation

[0024] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0025] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0027] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0028] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0029] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0030] Please see Figure 1 This utility model discloses a graded treatment system for electroplating wastewater. The system includes a collection module 1, a pretreatment module 2, a comprehensive treatment module 3, a deep treatment module 4, and a residue treatment module 5. The input end of the collection module 1 is connected to multiple electroplating production lines for wastewater collection. The input end of the pretreatment module 2 is connected to the output end of the collection module 1. The input end of the comprehensive treatment module 3 is connected to the output end of the pretreatment module 2. The input end of the deep treatment module 4 is connected to the output end of the comprehensive treatment module 3. The input end of the residue treatment module 5 is connected to the output end of the deep treatment module 4, thus forming the overall structure of the graded treatment system for electroplating wastewater. The system comprises several modules: Collection Module 1 collects cyanide-containing wastewater, chromium-containing wastewater, combined wastewater, and concentrated waste liquid from multiple electroplating production lines; Pretreatment Module 2 provides independent pretreatment for each type of wastewater, including cyanide-containing wastewater decyanation, chromium-containing wastewater reduction, and quantitative delivery of concentrated wastewater, before concentrating the pretreated wastewater into Comprehensive Treatment Module 3; Comprehensive Treatment Module 3 performs comprehensive adjustment, pH control, coagulation, flocculation, sedimentation, and solid-liquid separation on the wastewater, and delivers the resulting treated liquid to Deep Treatment Module 4 for further processing, while the resulting sludge is delivered to Residue Treatment Module 5; Deep Treatment Module 4 performs multi-media filtration, colloid and bacteria removal, and desalination on the wastewater, reusing the resulting effluent, and delivering the concentrated wastewater to Residue Treatment Module 5; Residue Treatment Module 5 performs concentration, crystallization, and separation on the concentrated wastewater, and pressure filtration and drying on the sludge, thus completing the graded treatment process for electroplating wastewater.

[0031] Based on this, specifically, the collection module 1 includes a cyanide collection tank 11, a chromium collection tank 12, and a concentrated solution storage tank 13; the input pipe of the cyanide collection tank 11 is connected to the cyanide electroplating line, and the output pipe of the cyanide collection tank 11 is connected to the pretreatment module 2; the input pipe of the chromium collection tank 12 is connected to the chromium electroplating line, and the output pipe of the chromium collection tank 12 is connected to the pretreatment module 2; the input of the concentrated solution storage tank 13 is connected to the electroplating solution concentration tank, and the output pipe of the concentrated solution storage tank 13 is connected to the pretreatment module 2. Correspondingly, specifically, the pretreatment module 2 includes a first cyanide-breaking tank 21, a second cyanide-breaking tank 22, a first reduction tank 23, and a second reduction tank 24; the input pipe of the first cyanide-breaking tank 21 is connected to the output of the cyanide-containing collection tank 11, and the output pipe of the first cyanide-breaking tank 21 is connected to the input of the second cyanide-breaking tank 22; the output pipe of the second cyanide-breaking tank 22 is connected to the integrated treatment module 3; the input of the first reduction tank 23 is connected to the chromium-containing collection tank 12 and the concentrated liquid storage tank 13 respectively, and the output pipe of the first reduction tank 23 is connected to the input of the second reduction tank 24; the output pipe of the second reduction tank 24 is connected to the integrated treatment module 3.

[0032] Furthermore, the collection module 1 also includes a comprehensive collection tank 14. The input end pipe of the comprehensive collection tank 14 is connected to other electroplating production lines, and the output end pipe of the comprehensive collection tank 14 is connected to the comprehensive treatment module 3 to comprehensively collect other electroplating wastewater besides cyanide-containing wastewater and chromium-containing wastewater.

[0033] Furthermore, the integrated treatment module 3 includes an integrated equalization tank 31, an inclined tube sedimentation tank 32, an intermediate water tank 33, and a sludge storage tank 34. The input end of the integrated equalization tank 31 is connected to the output end pipes of the second cyanide breaking tank 22, the second reduction tank 24, and the integrated collection tank 14, respectively. The output end pipe of the integrated equalization tank 31 is connected to the input end of the inclined tube sedimentation tank 32. The output end pipe of the inclined tube sedimentation tank 32 is connected to the input end of the intermediate water tank 33 and the input end of the sludge storage tank 34. The output end pipe of the intermediate water tank 33 is connected to the input end of the deep treatment module 4. The output end pipe of the sludge storage tank 34 is connected to the residue treatment module 5. Based on this, the integrated treatment module 3 collects pretreated cyanide-containing and chromium-containing wastewater and integrated wastewater, and completes the integrated treatment of wastewater and sewage through processes such as pH adjustment, coagulation, flocculation, and inclined tube sedimentation. The resulting supernatant is further processed by the deep treatment module 4, and the resulting sludge is directly transported to the residue treatment module 5 for treatment.

[0034] In one embodiment, the integrated treatment module 3 further includes a rapid mixing tank 35, which is located between the output end of the integrated equalization tank 31 and the input end of the inclined tube sedimentation tank 32, and connected by pipelines in sequence. Thus, the wastewater output from the integrated equalization tank 31 undergoes pH control and a preset dosing process in the rapid mixing tank 35, while being rapidly mixed.

[0035] In another embodiment, specifically, the integrated treatment module 3 further includes a slow mixing tank 36, which is located between the output end of the fast mixing tank 35 and the input end of the inclined tube sedimentation tank 32, and connected by pipes in sequence. Thus, the wastewater output from the fast mixing tank 35 is mixed with PAM in the slow mixing tank 36.

[0036] Furthermore, the deep treatment module 4 also includes a multi-media filter 41, an ultrafiltration (UF) system 42, a reverse osmosis (RO) system 43, and a recycled water tank 44. The input pipe of the multi-media filter 41 is connected to the input of the intermediate output, and the output pipe of the multi-media filter 41 is connected to the input of the ultrafiltration (UF) system 42. The output pipe of the ultrafiltration (UF) system 42 is connected to the input of the reverse osmosis (RO) system 43. The output pipe of the reverse osmosis (RO) system 43 is connected to the input of the recycled water tank 44 and the residue treatment module 5. Based on this, the deep treatment module 4 performs multi-stage filtration on the supernatant output from the comprehensive treatment module 3. The multi-media filter 41 removes residual micro-suspended matter to protect the subsequent membrane system; the ultrafiltration (UF) system 42 removes colloids, bacteria, and large molecular organic matter, serving as a perfect pretreatment for reverse osmosis; the reverse osmosis (RO) system 43 removes more than 98% of dissolved salts and small molecular organic matter, producing high-quality pure water that is directly reused in the mid-to-late stage cleaning process of the electroplating production line.

[0037] In one embodiment, the deep processing module 4 further includes an RO raw water tank 45, which is located between the output end of the ultrafiltration UF system 42 and the input end of the reverse osmosis RO system 43, and connected by pipes in sequence, so that the RO raw water tank 45 temporarily stores the filtrate output by the ultrafiltration UF system 42.

[0038] In another embodiment, specifically, the deep treatment module 4 also includes an RO concentrate tank 46, which is located between the output end of the reverse osmosis RO system 43 and the input end of the residue treatment module 5, and is connected by pipes in sequence, so that the RO concentrate tank 46 can temporarily store the concentrate output by the reverse osmosis RO system 43.

[0039] Furthermore, the residue treatment module 5 includes an MVR evaporator 51 and a plate and frame filter press 52. The input pipe of the MVR evaporator 51 is connected to the output of the RO concentrate tank 46; the input pipe of the plate and frame filter press 52 is connected to the output of the sludge storage tank 34, and the output pipe of the plate and frame filter press 52 is connected to the input of the integrated equalization tank 31. Thus, the MVR evaporator can further concentrate and crystallize the concentrate output from the RO concentrate tank 46 to obtain crystalline salt for hazardous waste transportation; the plate and frame filter press 52 filters the sludge, and the resulting filtrate is returned to the integrated equalization tank 31 for recycling treatment, and the resulting sludge cake is transported away as hazardous waste.

[0040] Furthermore, in one embodiment, the electroplating wastewater graded treatment system also includes several booster pumps, which are respectively arranged between the cyanide collection tank 11 and the first cyanide breaking tank 21, between the chromium collection tank 12 and the first reduction tank 23, between the comprehensive collection tank 14 and the comprehensive adjustment tank 31, and between the comprehensive adjustment tank 31 and the rapid mixing tank 35.

[0041] Furthermore, in another embodiment, the electroplating wastewater grading treatment system also includes a metering pump, which is located between the output end of the concentrated liquid storage tank 13 and the input end of the first reduction tank 23.

[0042] Furthermore, in another embodiment, the electroplating wastewater graded treatment system also includes two screw pumps, which are respectively located between the RO concentrate tank 46 and the MVR evaporator 51, and between the sludge storage tank 34 and the plate and frame filter press 52.

[0043] Furthermore, in another embodiment, the electroplating wastewater grading treatment system also includes a booster pump, which is located between the output end of the intermediate water tank 33 and the input end of the multi-media filter 41.

[0044] Furthermore, in another embodiment, the electroplating wastewater grading treatment system also includes a high-pressure pump, which is located between the output end of the RO raw water tank 45 and the input end of the reverse osmosis RO system 43.

[0045] In summary, the electroplating wastewater graded treatment system, through separate collection and dedicated pretreatment lines, avoids cross-contamination of pollutants at the source, laying a solid foundation for subsequent efficient treatment. Furthermore, the organic combination of comprehensive purification and deep treatment not only ensures efficient removal and stable compliance of pollutants but also enables large-scale water resource reuse. Finally, through residual fine treatment, the system achieves the ultimate safe disposal of waste. Specifically, cyanide-containing collection tanks, chromium-containing collection tanks, comprehensive collection tanks, and concentrated solution storage tanks are physically separated at the source of the production line through independent pipeline systems. This separates wastewaters with significantly different properties, completely preventing complex chemical reactions after mixing, which could produce more difficult-to-treat substances or create safety hazards. High-concentration concentrated solutions (waste plating solutions) are collected separately and transported quantitatively, avoiding instantaneous impact loads on the biological or membrane systems, protecting subsequent sensitive treatment units, and ensuring relatively stable water quality and quantity of the comprehensive wastewater, greatly reducing treatment difficulty and the uncertainty of reagent dosage. Dedicated lines are used to specifically and thoroughly decompose highly toxic cyanide. and carcinogenic hexavalent chromium The two-stage processing structure ensures the completeness of the reaction; the first stage oxidizes cyanide into less toxic cyanate. The second stage completely oxidizes it into non-toxic carbon dioxide and nitrogen; the first stage, under acidic conditions,... Reduced to a less toxic form The second stage ensures complete reduction and precipitation.

[0046] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0047] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A graded treatment system for electroplating wastewater, characterized in that, include: The system includes a collection module, a preprocessing module, a comprehensive processing module, a deep processing module, and a residue processing module. The input end of the collection module is connected to multiple electroplating production lines for wastewater collection; The input pipe of the pretreatment module is connected to the output of the collection module; the input pipe of the comprehensive treatment module is connected to the output of the pretreatment module; the input pipe of the deep treatment module is connected to the output of the comprehensive treatment module; and the input pipe of the residue treatment module is connected to the output of the deep treatment module, thus forming the overall structure of the electroplating wastewater graded treatment system. The collection module includes a cyanide collection tank, a chromium collection tank, and a concentrated solution storage tank; the input pipe of the cyanide collection tank is connected to the cyanide electroplating line, and the output pipe of the cyanide collection tank is connected to the pretreatment module; the input pipe of the chromium collection tank is connected to the chromium electroplating line, and the output pipe of the chromium collection tank is connected to the pretreatment module; the input end of the concentrated solution storage tank is connected to the electroplating solution concentration tank, and the output pipe of the concentrated solution storage tank is connected to the pretreatment module. The pretreatment module includes a first cyanide breaking tank, a second cyanide breaking tank, a first reduction tank, and a second reduction tank; The input pipe of the first cyanide-breaking tank is connected to the output pipe of the cyanide-containing collection tank, and the output pipe of the first cyanide-breaking tank is connected to the input pipe of the second cyanide-breaking tank; the output pipe of the second cyanide-breaking tank is connected to the integrated treatment module; the input of the first reduction tank is connected to the chromium-containing collection tank and the concentrated liquid storage tank respectively, and the output pipe of the first reduction tank is connected to the input of the second reduction tank; the output pipe of the second reduction tank is connected to the integrated treatment module.

2. The electroplating wastewater graded treatment system according to claim 1, characterized in that, The collection module also includes a comprehensive collection tank. The input pipe of the comprehensive collection tank is connected to other electroplating production lines, and the output pipe of the comprehensive collection tank is connected to the comprehensive processing module.

3. The electroplating wastewater graded treatment system according to claim 2, characterized in that, The integrated treatment module includes an integrated equalization tank, an inclined tube sedimentation tank, an intermediate water tank, and a sludge storage tank. The input end of the integrated equalization tank is connected to the output end pipes of the second cyanide breaking tank, the second reduction tank, and the integrated collection tank, respectively. The output end pipe of the integrated equalization tank is connected to the input end of the inclined tube sedimentation tank. The output end pipe of the inclined tube sedimentation tank is connected to the input end of the intermediate water tank and the input end of the sludge storage tank. The output end pipe of the intermediate water tank is connected to the input end of the deep treatment module. The output end pipe of the sludge storage tank is connected to the residue treatment module.

4. The electroplating wastewater graded treatment system according to claim 3, characterized in that, The integrated treatment module also includes a rapid mixing tank, which is located between the output end of the integrated equalization tank and the input end of the inclined tube sedimentation tank, and connected by pipelines in sequence.

5. The electroplating wastewater graded treatment system according to claim 4, characterized in that, The integrated treatment module also includes a slow mixing tank, which is located between the output end of the fast mixing tank and the input end of the inclined tube sedimentation tank, and connected by pipelines in sequence.

6. The electroplating wastewater graded treatment system according to claim 5, characterized in that, The advanced treatment module also includes a multi-media filter, an ultrafiltration (UF) system, a reverse osmosis (RO) system, and a reclaimed water tank. The input pipe of the multi-media filter is connected to the input of the intermediate output, and the output pipe of the multi-media filter is connected to the input of the ultrafiltration (UF) system. The output pipe of the ultrafiltration (UF) system is connected to the input of the reverse osmosis (RO) system. The output pipe of the reverse osmosis (RO) system is connected to the input of the reclaimed water tank and the residue treatment module.

7. The electroplating wastewater graded treatment system according to claim 6, characterized in that, The advanced treatment module also includes an RO raw water tank, which is located between the output end of the ultrafiltration (UF) system and the input end of the reverse osmosis (RO) system, and connected by pipes in sequence.

8. The electroplating wastewater graded treatment system according to claim 7, characterized in that, The advanced treatment module also includes an RO concentrate tank, which is located between the output end of the reverse osmosis (RO) system and the input end of the residue treatment module, and connected by pipelines in sequence.

9. The electroplating wastewater graded treatment system according to claim 8, characterized in that, The residue treatment module includes an MVR evaporator and a plate and frame filter press; the input pipe of the MVR evaporator is connected to the output of the RO concentrate tank; the input pipe of the plate and frame filter press is connected to the output of the sludge storage tank, and the output pipe of the plate and frame filter press is connected to the input of the integrated equalization tank.

10. The electroplating wastewater graded treatment system according to claim 9, characterized in that, The electroplating wastewater graded treatment system also includes several booster pumps, which are respectively located between the cyanide collection tank and the first cyanide breaking tank, between the chromium collection tank and the first reduction tank, between the comprehensive collection tank and the comprehensive adjustment tank, and between the comprehensive adjustment tank and the rapid mixing tank.

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