An integrated device for treating complex state nickel-containing wastewater

Abstract

The utility model provides a kind of complex state nickel-containing wastewater treatment integrated device, it is characterized in that, including integrated reaction tank, and integrated in the acidification system of this reaction tank, electrocatalytic oxidation system and sodium hypochlorite oxidation system.The utility model provides device by the synergistic effect of multiple process coupling optimization, realize the dynamic balance regulation and control of processing efficiency and energy consumption cost, to build efficient breakage system;It adopts high-efficiency anode material and self-adaptive current regulating module, supports the real-time feedback of processing parameter and operation strategy optimization, can self-adaptive match the processing demand of different load nickel-containing wastewater, finally effectively solves the comprehensive cost problem of too high caused by low processing efficiency, too high energy consumption and system dispersion of traditional process, provides high-efficiency, low energy consumption, easy maintenance and intelligent integrated technical scheme for complex state nickel-containing wastewater treatment.

Description

Technical Field

[0001] This utility model relates to a complex-breaking treatment device, and more specifically, a complex-breaking treatment device for complexed nickel-containing wastewater. Background Technology

[0002] Zinc-nickel alloy electroplating technology is widely used in the machinery, electronics, and automotive industries due to its excellent performance, and its share in the electroplating industry continues to increase. Currently, mainstream alkaline zinc-nickel alloy electroplating processes require the addition of additives such as triethanolamine, diethylamine, and EDTA to achieve stable co-deposition of zinc and nickel. However, these additives easily form highly stable coordination complexes with zinc and nickel ions (especially nickel ions) in wastewater, making it difficult for traditional methods to effectively treat such strongly complexed nickel-containing wastewater, resulting in high treatment costs and difficulty in meeting standards. To address this problem, existing technologies mainly employ chemical oxidation and electrocatalytic oxidation. Chemical oxidation involves adding oxidants such as sodium hypochlorite to break down the complex structure, releasing nickel ions before alkaline precipitation. However, this method suffers from high oxidant consumption, high operating costs, and the generation of irritating gases and large amounts of nickel-containing sludge. Electrocatalytic oxidation utilizes an electric field to generate strong oxidizing free radicals to break down the complex, while simultaneously reducing and depositing nickel at the cathode. While this method has the advantages of less sludge and convenient operation, there are also some bottlenecks that limit its development: First, the current efficiency decreases sharply with the extension of electrolysis time, resulting in a significant increase in energy consumption; second, the treatment efficiency is highly dependent on the anode material, resulting in high cost and limited material life; and third, the efficiency of complete complex breaking in a single process is low.

[0003] To address the shortcomings of existing technologies in treating strongly complexed nickel-containing wastewater in terms of economy, intelligent operation, ease of maintenance, and system integration, there is an urgent need to develop a wastewater treatment technology and equipment with high integration, low energy consumption, and easy control. Based on this, this invention presents a complex-breaking treatment device for complexed nickel-containing wastewater. This device achieves dynamic balance control between treatment efficiency and energy cost through the synergistic effect of multi-process coupling optimization, thereby constructing a highly efficient complex-breaking treatment system. It employs high-efficiency anode materials and an adaptive current regulation module, supporting real-time feedback of treatment parameters and optimization of operating strategies. It can adaptively match the treatment needs of nickel-containing wastewater with different loads, ultimately effectively solving the problem of high overall cost caused by low treatment efficiency, excessive energy consumption, and decentralized systems in traditional processes. This provides a high-efficiency, low-energy-consumption, easy-to-maintain, and intelligently integrated technical solution for the treatment of complexed nickel-containing wastewater. Summary of the Invention

[0004] To solve the above-mentioned technical problems, this utility model provides an integrated device for treating complexed nickel-containing wastewater, which adopts the following technical solution:

[0005] An integrated device for treating complexed nickel-containing wastewater is characterized by comprising an integrated reaction tank 14, and an acid addition system 18, an electrocatalytic oxidation system 19, and a sodium hypochlorite oxidation system 20 integrated within the reaction tank. The integrated reaction tank 14 is made of an insulating and corrosion-resistant material, and an overflow plate 6 for the acid addition zone and an overflow plate 9 for the electrocatalytic oxidation zone are sequentially arranged inside the integrated reaction tank 14. The overflow plate 6 for the acid addition zone separates the acid addition system 18 from the electrocatalytic oxidation system 19, and its top is 150 mm to 200 mm from the upper edge of the integrated reaction tank 14. The overflow plate 9 for the electrocatalytic oxidation zone separates the electrocatalytic oxidation system 19 from the sodium hypochlorite oxidation system 20, and its top is 150 mm to 200 mm from the upper edge of the integrated reaction tank 14.

[0006] Furthermore, the acid addition system 18 includes a wastewater inlet pipe 3, an acid addition pipe 2, a pH meter 4, and an acid addition zone baffle 5; the wastewater inlet pipe 3 is 100 mm to 150 mm from the upper edge of the integrated reaction tank 14; the acid addition pipe 2 extends 200 mm to 300 mm below the liquid surface; the pH meter 4 extends 300 mm to 400 mm below the liquid surface; the acid addition zone baffle 5 is welded and fixed to the side wall of the integrated reaction tank 14, vertically positioned at the center of the acid addition zone, with its lower edge 50 mm to 100 mm from the bottom of the integrated reaction tank 14, and its upper edge flush with the top of the integrated reaction tank 14.

[0007] Furthermore, the electrocatalytic oxidation system 19 includes a DC power supply 1, a cathode plate 7, and an anode plate 8; the cathode plate 7 is a stainless steel 316 mesh plate and is connected to the negative electrode of the DC power supply 1; the anode plate 8 is a titanium-based precious metal coated mesh plate, a graphite plate, or a boron-doped diamond plate and is connected to the positive electrode of the DC power supply 1; the number of cathode plates 7 is one more than the number of anode plates 8, and the two are arranged alternately with a spacing of 50 mm to 70 mm.

[0008] Furthermore, the sodium hypochlorite oxidation system 20 includes a dosing pipe 10, a sodium hypochlorite oxidation zone baffle 11, a circulation return pipe 12, a return port 16, a wastewater outlet pipe 13, an ORP instrument 15, and a circulation return pump 17; the dosing pipe 10 extends 200 mm to 300 mm below the liquid surface; the sodium hypochlorite oxidation zone baffle 11 is welded and fixed to the side wall of the integrated reaction tank 14, vertically positioned at the center of the oxidation zone, with its lower edge 50 mm to 100 mm from the bottom of the integrated reaction tank 14, and its upper edge flush with the top of the integrated reaction tank 14.

[0009] Furthermore, the wastewater outlet pipe 13 is 150 mm to 200 mm away from the upper edge of the integrated reaction tank 14; the circulation return pipe 12 connects the return port 16 and the circulation return pump 17, and the return port 16 is 50 mm to 70 mm away from the bottom of the integrated reaction tank 14; the ORP instrument 15 is installed on the pipe between the return port 16 and the circulation return pump 17; the outlet of the circulation return pump 17 is connected to the sodium hypochlorite oxidation system 20, and the circulation ratio is 300% to 500%.

[0010] Furthermore, the insulating and corrosion-resistant material is PP, fiberglass, or polytetrafluoroethylene.

[0011] Furthermore, the acid addition zone baffle 5 and the acid addition zone overflow plate 6 are arranged in parallel, and the distance between them forms a wastewater baffle channel.

[0012] Furthermore, the baffle plate 11 of the sodium hypochlorite oxidation zone and the overflow plate 9 of the electrocatalytic oxidation zone are arranged in parallel, and the distance between them forms a wastewater baffle channel.

[0013] Compared with existing technologies, the advantages of this utility model are:

[0014] (1) This device is an automated processing device, which is easy to operate and reduces labor costs;

[0015] (2) This device is a combined process integrated device. The two processes complement each other, improve the efficiency of electrocatalytic oxidation treatment, reduce the electrocatalytic reaction time, improve the oxidation efficiency of sodium hypochlorite, reduce the dosage of sodium hypochlorite, and successfully achieve cost reduction and efficiency improvement.

[0016] (3) The current density of the electrocatalytic oxidation zone is adjustable, and the ORP range of the sodium hypochlorite oxidation zone is adjustable, which can cope with water quality fluctuations of a certain magnitude and has strong shock resistance.

[0017] (4) The device occupies a small area and most of the main materials are inexpensive, resulting in a low overall investment cost;

[0018] (5) The device has a simple structure, is easy to install, and is conducive to long-term operation and maintenance. Attached Figure Description

[0019] Figure 1 This is the front view of the present invention. Figure 2 This is a top view of the present invention.

[0020] The components are as follows: 1-DC power supply, 2-acid addition pipe, 3-wastewater inlet pipe, 4-pH meter, 5-acid addition zone baffle plate, 6-acid addition zone overflow plate, 7-cathode plate, 8-anode plate, 9-electrocatalytic oxidation zone overflow plate, 10-dosing pipe, 11-sodium hypochlorite oxidation zone baffle plate, 12-circulation return pipe, 13-wastewater outlet pipe, 14-integrated reaction tank, 15-ORP instrument, 16-return port, 17-circulation return pump, 18-acid addition system, 19-electrocatalytic oxidation system, 20-sodium hypochlorite oxidation system. Detailed Implementation

[0021] The present invention will be further described and illustrated below with reference to the accompanying drawings and specific embodiments.

[0022] like Figure 1 and Figure 2 As shown, this utility model provides an integrated device for treating complexed nickel-containing wastewater, characterized in that it includes an integrated reaction tank 14, and an acid addition system 18, an electrocatalytic oxidation system 19, and a sodium hypochlorite oxidation system 20 integrated within the reaction tank; the integrated reaction tank 14 is made of insulating and corrosion-resistant material, and an overflow plate 6 for the acid addition zone and an overflow plate 9 for the electrocatalytic oxidation zone are sequentially arranged inside the integrated reaction tank 14; the overflow plate 6 for the acid addition zone separates the acid addition system 18 and the electrocatalytic oxidation system 19, and its top is 150 mm to 200 mm from the upper edge of the integrated reaction tank 14; the overflow plate 9 for the electrocatalytic oxidation zone separates the electrocatalytic oxidation system 19 and the sodium hypochlorite oxidation system 20, and its top is 150 mm to 200 mm from the upper edge of the integrated reaction tank 14.

[0023] The acid addition system 18 includes a wastewater inlet pipe 3, an acid addition pipe 2, a pH meter 4, and an acid addition zone baffle 5. The wastewater inlet pipe 3 is 100 mm to 150 mm from the upper edge of the integrated reaction tank 14. The acid addition pipe 2 extends 200 mm to 300 mm below the liquid surface. The pH meter 4 extends 300 mm to 400 mm below the liquid surface. The acid addition zone baffle 5 is welded and fixed to the side wall of the integrated reaction tank 14, vertically positioned at the center of the acid addition zone, with its lower edge 50 mm to 100 mm from the bottom of the integrated reaction tank 14 and its upper edge flush with the top of the integrated reaction tank 14.

[0024] The electrocatalytic oxidation system 19 includes a DC power supply 1, a cathode plate 7, and an anode plate 8; the cathode plate 7 is a 316 stainless steel mesh plate and is connected to the negative electrode of the DC power supply 1; the anode plate 8 is a titanium-based precious metal coated mesh plate, a graphite plate, or a boron-doped diamond plate and is connected to the positive electrode of the DC power supply 1; the number of cathode plates 7 is one more than the number of anode plates 8, and the two are arranged alternately with a spacing of 50 mm to 70 mm.

[0025] The sodium hypochlorite oxidation system 20 includes a dosing pipe 10, a sodium hypochlorite oxidation zone baffle 11, a circulation return pipe 12, a return port 16, a wastewater outlet pipe 13, an ORP instrument 15, and a circulation return pump 17; the dosing pipe 10 extends 200 mm to 300 mm below the liquid surface; the sodium hypochlorite oxidation zone baffle 11 is welded and fixed to the side wall of the integrated reaction tank 14, vertically located at the center of the oxidation zone, with its lower edge 50 mm to 100 mm from the bottom of the integrated reaction tank 14, and its upper edge flush with the top of the integrated reaction tank 14.

[0026] The wastewater outlet pipe 13 is 150 mm to 200 mm away from the upper edge of the integrated reaction tank 14; the circulation return pipe 12 connects the return port 16 and the circulation return pump 17, and the return port 16 is 50 mm to 70 mm away from the bottom of the integrated reaction tank 14; the ORP instrument 15 is installed on the pipe between the return port 16 and the circulation return pump 17; the outlet of the circulation return pump 17 is connected to the sodium hypochlorite oxidation system 20, and the circulation ratio is 300% to 500%.

[0027] The insulating and corrosion-resistant material is PP, fiberglass, or polytetrafluoroethylene.

[0028] The baffle plate 5 in the acid addition zone and the overflow plate 6 in the acid addition zone are arranged in parallel, and the distance between them forms a wastewater baffle channel.

[0029] The baffle plate 11 in the sodium hypochlorite oxidation zone and the overflow plate 9 in the electrocatalytic oxidation zone are arranged in parallel, and the distance between them forms a wastewater baffle channel.

[0030] The system's processing flow is as follows:

[0031] Complexed nickel-containing wastewater is transported to the acidification system 18 through the wastewater inlet pipe 3. A pH meter 4 monitors the pH value of the wastewater in real time. When the pH value is greater than 7.0, the acidification pipe 2 begins adding a 20%~30% sulfuric acid solution until the pH value is less than 6.0, at which point the acidification pipe stops adding acid. The hydraulic retention time in the acidification zone is controlled at 30~40 minutes. An acidification zone baffle 5 is installed inside the acidification zone to promote uniform mixing of the reagents. After pH adjustment, the wastewater overflows through the overflow plate 6 in the acidification zone to the electrocatalytic oxidation system 19. During the wastewater treatment process, the voltage of the electrocatalytic oxidation system 19 is set at 5V~20V, and the current is set at 20A / m. 2 ~100 A / m 2The hydraulic retention time in the electrocatalytic oxidation zone is controlled at 2-5 hours. Electrocatalytic oxidation reaction occurs under the action of cathode plate 7 and anode plate 8. The wastewater after the reaction overflows through the overflow plate 9 of the electrocatalytic oxidation zone to the sodium hypochlorite oxidation system 20. The sodium hypochlorite oxidation system 20 adopts a top dosing method. The ORP meter 15 monitors the ORP of the wastewater in real time. 10%-20% sodium hypochlorite solution is added through the dosing pipe 10 to maintain the ORP of the wastewater at 1100 mV-1110 mV. The sodium hypochlorite solution and wastewater are mixed through the return port 16, the circulation return pipe 12 and the circulation return pump 17. The circulation ratio is controlled at 300%-500%. The hydraulic retention time in the sodium hypochlorite oxidation zone is controlled at 30-60 minutes. The sodium hypochlorite oxidation zone is equipped with a sodium hypochlorite oxidation zone baffle 11 to promote uniform mixing of the reagents. The wastewater after the reaction is discharged into the on-site reaction sedimentation tank through the wastewater outlet pipe 13 for alkali reaction sedimentation treatment.

[0032] This invention achieves dynamic balance control between treatment efficiency and energy consumption cost through the synergistic effect of multi-process coupling optimization, thereby constructing a highly efficient complex-breaking treatment system. It adopts high-efficiency anode materials and adaptive current adjustment modules, supports real-time feedback of treatment parameters and optimization of operating strategies, and can adaptively match the treatment needs of nickel-containing wastewater with different loads. Ultimately, it effectively solves the problem of high comprehensive cost caused by low treatment efficiency, high energy consumption and decentralized system in traditional processes, and provides a high-efficiency, low-energy, easy-to-maintain and intelligently integrated technical solution for the treatment of complexed nickel-containing wastewater. Example

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0034] An integrated device for treating complexed nickel-containing wastewater was developed using the above technical solution, such as... Figure 1 and Figure 2 .

[0035] The system includes a DC power supply 1, an acid addition pipe 2, a wastewater inlet pipe 3, a pH meter 4, an acid addition zone baffle 5, an acid addition zone overflow plate 6, a cathode plate 7, an anode plate 8, an electrocatalytic oxidation zone overflow plate 9, a dosing pipe 10, a sodium hypochlorite oxidation zone baffle 11, a circulation return pipe 12, a wastewater outlet pipe 13, an integrated reaction tank 14, an ORP instrument 15, a return port 16, a circulation return pump 17, an acid addition system 18, an electrocatalytic oxidation system 19, and a sodium hypochlorite oxidation system 20.

[0036] The device includes an integrated reaction tank 14, and an acid addition system 18, an electrocatalytic oxidation system 19, and a sodium hypochlorite oxidation system 20 integrated within the reaction tank. The integrated reaction tank 14 is made of insulating and corrosion-resistant material. An overflow plate 6 for the acid addition zone and an overflow plate 9 for the electrocatalytic oxidation zone are arranged sequentially inside the integrated reaction tank 14. The overflow plate 6 for the acid addition zone separates the acid addition system 18 from the electrocatalytic oxidation system 19, and its top is 150 mm to 200 mm from the upper edge of the integrated reaction tank 14. The overflow plate 9 for the electrocatalytic oxidation zone separates the electrocatalytic oxidation system 19 from the sodium hypochlorite oxidation system 20, and its top is 150 mm to 200 mm from the upper edge of the integrated reaction tank 14.

[0037] The acid addition system 18 includes a wastewater inlet pipe 3, an acid addition pipe 2, a pH meter 4, and an acid addition zone baffle 5. The wastewater inlet pipe 3 is 100 mm to 150 mm from the upper edge of the integrated reaction tank 14. The acid addition pipe 2 extends 200 mm to 300 mm below the liquid surface. The pH meter 4 extends 300 mm to 400 mm below the liquid surface. The acid addition zone baffle 5 is welded and fixed to the side wall of the integrated reaction tank 14, vertically positioned at the center of the acid addition zone, with its lower edge 50 mm to 100 mm from the bottom of the integrated reaction tank 14 and its upper edge flush with the top of the integrated reaction tank 14.

[0038] The electrocatalytic oxidation system 19 includes a DC power supply 1, a cathode plate 7, and an anode plate 8; the cathode plate 7 is a 316 stainless steel mesh plate and is connected to the negative electrode of the DC power supply 1; the anode plate 8 is a titanium-based precious metal coated mesh plate, a graphite plate, or a boron-doped diamond plate and is connected to the positive electrode of the DC power supply 1; the number of cathode plates 7 is one more than the number of anode plates 8, and the two are arranged alternately with a spacing of 50 mm to 70 mm.

[0039] The sodium hypochlorite oxidation system 20 includes a dosing pipe 10, a sodium hypochlorite oxidation zone baffle 11, a circulation return pipe 12, a return port 16, a wastewater outlet pipe 13, an ORP instrument 15, and a circulation return pump 17; the dosing pipe 10 extends 200 mm to 300 mm below the liquid surface; the sodium hypochlorite oxidation zone baffle 11 is welded and fixed to the side wall of the integrated reaction tank 14, vertically located at the center of the oxidation zone, with its lower edge 50 mm to 100 mm from the bottom of the integrated reaction tank 14, and its upper edge flush with the top of the integrated reaction tank 14.

[0040] The wastewater outlet pipe 13 is 150 mm to 200 mm away from the upper edge of the integrated reaction tank 14; the circulation return pipe 12 connects the return port 16 and the circulation return pump 17, and the return port 16 is 50 mm to 70 mm away from the bottom of the integrated reaction tank 14; the ORP instrument 15 is installed on the pipe between the return port 16 and the circulation return pump 17; the outlet of the circulation return pump 17 is connected to the sodium hypochlorite oxidation system 20, and the circulation ratio is 300% to 500%.

[0041] The insulating and corrosion-resistant material is PP, fiberglass, or polytetrafluoroethylene.

[0042] The baffle plate 5 in the acid addition zone and the overflow plate 6 in the acid addition zone are arranged in parallel, and the distance between them forms a wastewater baffle channel.

[0043] The baffle plate 11 in the sodium hypochlorite oxidation zone and the overflow plate 9 in the electrocatalytic oxidation zone are arranged in parallel, and the distance between them forms a wastewater baffle channel.

[0044] This device was used to treat highly complexed zinc-nickel alloy wastewater from an electroplating industrial park in Ningbo City. The influent water quality is shown in Table 1, and the treatment parameters and effluent water quality are shown in Table 2. Table 2 shows that the total reaction time is only 4 hours, demonstrating the device's high efficiency. Furthermore, the treated effluent meets the requirement of a total nickel concentration of less than 0.30 mg / L. In terms of cost, the combined complex-breaking treatment device saves approximately 45% of the sodium hypochlorite dosage compared to the sodium hypochlorite oxidation process, significantly reducing operating costs. Electrocatalytic oxidation devices, due to their long reaction time, require multiple units to achieve the same daily wastewater treatment capacity as the combined complex-breaking treatment device, resulting in a substantial increase in investment costs. Therefore, the combined complex-breaking treatment device is more economical.

[0045] pH Ni (mg / L) Zn (mg / L) Total nitrogen (mg / L) Organic nitrogen (mg / L) COD (mg / L) 12.7 60 400 600 510 4500

[0046] reaction pH Electrocatalytic reaction time Sodium hypochlorite dosage Sodium hypochlorite reaction time Total nickel concentration in alkaline precipitation effluent Organic nitrogen concentration in alkaline precipitation effluent 7.0 4 h 200 mL / L 0.5 h 0.15 mg / L 150 mg / L

[0047] The above-described embodiments are merely illustrative of one implementation of this utility model and are not intended to limit it. It should be noted that those skilled in the art can modify the technical solutions described in the above embodiments or make equivalent substitutions for some or all of the technical features; however, these modifications or substitutions do not cause the essence of the corresponding technical solutions to depart from the protection scope of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the protection scope of this utility model.

Claims

1. An integrated device for treating complexed nickel-containing wastewater, characterized in that, The system includes an integrated reaction tank (14), and an acid addition system (18), an electrocatalytic oxidation system (19), and a sodium hypochlorite oxidation system (20) integrated within the reaction tank. The integrated reaction tank (14) is made of insulating and corrosion-resistant material. An overflow plate (6) for the acid addition zone and an overflow plate (9) for the electrocatalytic oxidation zone are arranged sequentially inside the integrated reaction tank (14). The overflow plate (6) for the acid addition zone separates the acid addition system (18) from the electrocatalytic oxidation system (19), and its top is 150 mm to 200 mm from the upper edge of the integrated reaction tank (14). The overflow plate (9) for the electrocatalytic oxidation zone separates the electrocatalytic oxidation system (19) from the sodium hypochlorite oxidation system (20), and its top is 150 mm to 200 mm from the upper edge of the integrated reaction tank (14).

2. The integrated device for treating complexation state nickel-containing wastewater according to claim 1, characterized in that, The acid addition system (18) includes a wastewater inlet pipe (3), an acid addition pipe (2), a pH meter (4), and an acid addition zone baffle plate (5); the wastewater inlet pipe (3) is 100 mm to 150 mm from the upper edge of the integrated reaction tank (14); the acid addition pipe (2) extends 200 mm to 300 mm below the liquid surface; the pH meter (4) extends 300 mm to 400 mm below the liquid surface; the acid addition zone baffle plate (5) is welded and fixed to the side wall of the integrated reaction tank (14), vertically located in the center of the acid addition zone, with its lower edge 50 mm to 100 mm from the bottom of the integrated reaction tank (14), and its upper edge flush with the top of the integrated reaction tank (14).

3. The integrated device for treating complexation state nickel-containing wastewater according to claim 1, characterized in that, The electrocatalytic oxidation system (19) includes a DC power supply (1), a cathode plate (7) and an anode plate (8); the cathode plate (7) is a stainless steel 316 mesh plate and is connected to the negative electrode of the DC power supply (1); the anode plate (8) is a titanium-based noble metal coated mesh plate, a graphite plate or a boron-doped diamond plate and is connected to the positive electrode of the DC power supply (1); the number of cathode plates (7) is one more than the number of anode plates (8), and the two are arranged alternately with a spacing of 50 mm to 70 mm.

4. The integrated device for treating complexation state nickel-containing wastewater according to claim 1, characterized in that, The sodium hypochlorite oxidation system (20) includes a dosing pipe (10), a sodium hypochlorite oxidation zone baffle (11), a circulation return pipe (12), a return port (16), a wastewater outlet pipe (13), an ORP instrument (15), and a circulation return pump (17); the dosing pipe (10) extends 200 mm to 300 mm below the liquid surface; the sodium hypochlorite oxidation zone baffle (11) is welded and fixed to the side wall of the integrated reaction tank (14), vertically located at the center of the oxidation zone, with its lower edge 50 mm to 100 mm from the bottom of the integrated reaction tank (14), and its upper edge flush with the top of the integrated reaction tank (14).

5. The integrated device for treating complexation state nickel-containing wastewater according to claim 4, characterized in that, The wastewater outlet pipe (13) is 150 mm to 200 mm away from the upper edge of the integrated reaction tank (14); the circulating return pipe (12) connects the return port (16) and the circulating return pump (17), and the return port (16) is 50 mm to 70 mm away from the bottom of the integrated reaction tank (14); the ORP instrument (15) is installed on the pipe between the return port (16) and the circulating return pump (17); the outlet of the circulating return pump (17) is connected to the sodium hypochlorite oxidation system (20), and the circulation ratio is 300% to 500%.

6. The integrated device for treating complexation state nickel-containing wastewater according to claim 1, characterized in that, The insulating and corrosion-resistant material is PP, fiberglass, or polytetrafluoroethylene.

7. The integrated device for treating complexation state nickel-containing wastewater according to claim 2, characterized in that, The baffle plate (5) in the acid addition zone and the overflow plate (6) in the acid addition zone are arranged in parallel, and the distance between them forms a wastewater baffle channel.

8. The integrated device for treating complexation state nickel-containing wastewater according to claim 4, characterized in that, The baffle plate (11) of the sodium hypochlorite oxidation zone and the overflow plate (9) of the electrocatalytic oxidation zone are arranged in parallel, and the distance between them forms a wastewater baffle channel.

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