Nickel-containing wastewater treatment equipment for chemically plating nickel, zinc and nickel in electroplating wastewater

Abstract

The utility model relates to the technical field of wastewater treatment, in particular to nickel-containing wastewater treatment equipment for chemically plating nickel, zinc and nickel in electroplating wastewater, which comprises a nickel plating, zinc and nickel wastewater pretreatment mechanism and a nickel-containing wastewater treatment mechanism, the electroless nickel and zinc nickel wastewater pretreatment mechanism comprises an electroless nickel wastewater adjusting tank, an electroless nickel phosphorus removal reactor, an electroless nickel PH adjusting tank, an intermediate water tank I and an electrochemical reaction device; the nickel-containing wastewater treatment mechanism comprises a nickel-containing wastewater regulating tank, a sedimentation tank, a middle water tank II, a nickel-containing wastewater Fenton reaction unit, a middle water tank III, a nickel-containing MCR, an ion exchanger, a nickel-containing wastewater monitoring tank and a nickel-containing sludge tank. The chemical nickel, zinc and nickel wastewater pretreatment mechanism and the nickel-containing wastewater treatment mechanism cooperatively operate, so that water quality and water quantity can be balanced, phosphorus elements can be removed in a targeted manner, pollutants such as phosphorus, nickel and the like in wastewater can be efficiently removed, the effluent quality is ensured to reach or even be superior to the discharge standard, and environmental pollution is effectively reduced.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, specifically to a nickel-containing wastewater treatment device for electroplating wastewater containing nickel and zinc-nickel electroplating. Background Technology

[0002] In the electroplating industry, nickel-containing wastewater generated from electroless nickel plating and zinc-nickel plating processes has always been a challenge for environmental governance due to its complex composition and difficulty in treatment. Traditional treatment methods suffer from low efficiency, high cost, and difficulty in meeting emission standards. In particular, phosphorus and nickel in the wastewater are difficult to remove effectively, which can easily lead to environmental pollution and resource waste. Utility Model Content

[0003] This utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, one objective of this utility model is to provide a nickel-containing wastewater treatment device for electroless nickel and zinc-nickel plating wastewater, which achieves deep treatment of the wastewater through the coordinated operation of a pretreatment mechanism for the nickel and zinc-nickel plating wastewater and a treatment mechanism for the nickel-containing wastewater.

[0004] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows: a pretreatment mechanism for nickel and zinc-nickel wastewater, comprising a nickel-based wastewater equalization tank, a nickel-based phosphorus removal reactor, a nickel-based pH equalization tank, an intermediate water tank, and an electrochemical reaction device, wherein the nickel-based wastewater equalization tank, the nickel-based phosphorus removal reactor, the nickel-based pH equalization tank, the intermediate water tank, and the electrochemical reaction device are sequentially connected by pipelines; and a nickel-containing wastewater treatment mechanism, comprising a nickel-containing wastewater emergency tank, a nickel-containing wastewater equalization tank, a sedimentation tank, an intermediate water tank, a nickel-containing wastewater Fenton reaction unit, an intermediate water tank, a nickel-containing MCR, an ion exchanger, a nickel-containing wastewater monitoring tank, and a nickel-containing sludge tank. The nickel-containing wastewater emergency tank, the nickel-containing wastewater equalization tank, the sedimentation tank, the second intermediate water tank, the nickel-containing wastewater Fenton reaction unit, the third intermediate water tank, the nickel-containing MCR, the ion exchanger, and the nickel-containing wastewater monitoring tank are sequentially connected by pipelines. The nickel-containing sludge tank is connected by pipelines to the sludge pipelines of the sedimentation tank and the nickel-containing wastewater Fenton reaction unit. The ion exchanger is also connected to the pipeline of the nickel-containing wastewater equalization tank. After treating the nickel-plating and zinc-nickel wastewater, it is converted into nickel-containing wastewater. The electrochemical reaction device is connected to the nickel-containing wastewater equalization tank by pipelines, and the converted nickel-containing wastewater is sent to the nickel-containing wastewater treatment mechanism for further treatment.

[0005] Preferably, the nickel leaching wastewater equalization tank is connected to a nickel leaching wastewater emergency tank via a pipeline, and the nickel leaching wastewater emergency tank is also connected to the nickel leaching phosphorus removal reactor via a pipeline.

[0006] Preferably, the sedimentation tank includes a primary reaction sedimentation tank and a secondary reaction sedimentation tank.

[0007] Preferably, the nickel-containing wastewater Fenton reaction unit includes a pH adjustment tank, a mixing tank, a Fenton reaction tank, a neutralization tank, and a reaction sedimentation tank connected in sequence by pipelines. The pH adjustment tank is connected to the intermediate water tank by a second pipeline. The supernatant of the reaction sedimentation tank is connected to the intermediate water tank by a third pipeline for transportation. The sludge pipeline of the reaction sedimentation tank is connected to the nickel-containing sludge tank by a third pipeline.

[0008] Preferably, the ion exchanger is also connected to a self-regenerating medicine tank via a pipeline, and two self-regenerating medicine tanks are provided.

[0009] Preferably, the nickel-containing wastewater equalization tank pipeline is connected to a nickel-containing wastewater emergency tank, and the nickel-containing wastewater emergency tank is also connected to the primary reaction sedimentation tank pipeline.

[0010] Preferably, the inner walls of the nickel-plating wastewater equalization tank, the nickel-plating wastewater emergency tank, the nickel-containing wastewater equalization tank, the nickel-containing wastewater emergency tank, the pH equalization tank, the mixing tank, and the neutralization tank are all provided with perforated aeration pipes, and the perforated aeration pipes are connected to a self-regulating tank blower through pipelines.

[0011] With the above structure, this utility model has the following advantages:

[0012] This utility model's pretreatment mechanism for nickel and zinc-nickel wastewater works in conjunction with a nickel-containing wastewater treatment mechanism. The nickel-chemical wastewater equalization tank balances the water quality and quantity, the nickel-chemical phosphorus removal reactor specifically removes phosphorus, the electrochemical reaction device further treats the wastewater, and then the Fenton reaction unit in the nickel-containing wastewater treatment mechanism oxidizes and decomposes organic matter, while MCR and ion exchangers deeply remove nickel. This can efficiently remove pollutants such as phosphorus and nickel from the wastewater, ensuring that the effluent quality meets or even exceeds the discharge standards, effectively reducing environmental pollution.

[0013] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the present invention will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1This is a system block diagram of the pretreatment mechanism for nickel and zinc-nickel wastewater of this utility model.

[0016] Figure 2 This is a system block diagram of the nickel-containing wastewater treatment mechanism of this utility model.

[0017] Figure 3 This is a schematic diagram of the self-regenerating medicine box of this utility model.

[0018] As shown in the figure:

[0019] 1. Nickel smelting wastewater emergency tank; 2. Nickel smelting wastewater equalization tank; 3. Perforated aeration pipe; 4. Nickel smelting phosphorus removal reactor; 5. Nickel smelting pH equalization tank; 6. Self-regenerating reagent tank; 7. Intermediate water tank one; 8. Electrochemical reaction device; 9. Nickel-containing wastewater emergency tank; 10. Nickel-containing wastewater equalization tank; 11. Primary reaction sedimentation tank; 12. Secondary reaction sedimentation tank; 13. Intermediate water tank two; 14. pH equalization tank; 15. Mixing tank; 16. Fenton reaction tank; 17. Neutralization tank; 18. Reaction sedimentation tank; 19. Intermediate water tank three; 20. Nickel-containing sludge tank; 21. Nickel-containing MCR; 22. Ion exchanger; 23. Nickel-containing wastewater monitoring tank. Detailed Implementation

[0020] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0021] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0022] Combination Figures 1-3 As shown, a nickel-containing wastewater treatment device for electroplating wastewater containing nickel and zinc-nickel electroplating includes a pretreatment unit for nickel and zinc-nickel electroplating wastewater and a treatment unit for nickel-containing wastewater.

[0023] The pretreatment unit for nickel and zinc-nickel wastewater includes a nickel wastewater equalization tank 2, a nickel dephosphorization reactor 4, a nickel pH equalization tank 5, an intermediate water tank 7, and an electrochemical reaction device 8. These components are sequentially connected by pipelines. The nickel-containing wastewater treatment unit includes a nickel-containing wastewater emergency tank 9, a nickel-containing wastewater equalization tank 10, a sedimentation tank, an intermediate water tank 2 13, a nickel-containing wastewater Fenton reaction unit, an intermediate water tank 3 19, a nickel-containing MCR 21, an ion exchanger 22, a nickel-containing wastewater monitoring tank 23, and a nickel-containing sludge tank 20. The nickel-containing wastewater emergency tank 9 and the nickel-containing wastewater... The water equalization tank 10, sedimentation tank, intermediate water tank 2 13, nickel-containing wastewater Fenton reaction unit, intermediate water tank 3 19, nickel-containing MCR 21, ion exchanger 22, and nickel-containing wastewater monitoring tank 23 are sequentially connected by pipelines. The nickel-containing sludge tank 20 is connected by pipelines to the sludge pipelines of the sedimentation tank and the nickel-containing wastewater Fenton reaction unit. The wastewater pipeline of the ion exchanger 22 is also connected to the pipeline of the nickel-containing wastewater equalization tank 10. After the nickel-plating and zinc-nickel wastewater is treated, it is converted into nickel-containing wastewater. The electrochemical reaction device 8 is connected to the nickel-containing wastewater equalization tank 10 by pipelines, and the converted nickel-containing wastewater is sent to the nickel-containing wastewater treatment unit for treatment.

[0024] In one embodiment of this utility model, the nickel smelting wastewater equalization tank 2 is connected to the nickel smelting wastewater emergency tank 1 via a pipeline, and the nickel smelting wastewater emergency tank 1 is also connected to the nickel smelting phosphorus removal reactor 4 via a pipeline. Specifically, as shown... Figure 1 As shown, the nickel smelting wastewater emergency tank 1 is located next to the nickel smelting wastewater equalization tank 2, and the two are connected by a pipeline with valve control. This allows the wastewater to be temporarily introduced into the nickel smelting wastewater emergency tank 1 in case of abnormalities in the nickel smelting wastewater equalization tank 2, such as sudden changes in water quality or a surge in water volume. The pipeline connecting the nickel smelting wastewater emergency tank 1 to the nickel smelting phosphorus removal reactor 4 is also equipped with valves. After the emergency situation is resolved, the wastewater in the emergency tank can be gradually transported to the phosphorus removal reactor for treatment, ensuring the continuity and safety of the entire pretreatment process.

[0025] In one embodiment of this utility model, the sedimentation tank includes a primary reaction sedimentation tank 11 and a secondary reaction sedimentation tank 12. Specifically, as shown... Figure 2 As shown, the primary reaction sedimentation tank 11 and the secondary reaction sedimentation tank 12 are arranged in series. The primary reaction sedimentation tank 11 receives wastewater from the nickel-containing wastewater equalization tank 10. It is equipped with a stirring device and a chemical dosing port. By adding flocculants and other agents, the suspended particles in the wastewater are initially coagulated and precipitated. The supernatant after sedimentation flows into the secondary reaction sedimentation tank 12 through the overflow port. The secondary reaction sedimentation tank 12 further performs deep sedimentation treatment on the wastewater. By extending the sedimentation time and optimizing the water flow path, it ensures that the impurities in the wastewater are fully settled, providing high-quality influent conditions for subsequent treatment.

[0026] In one embodiment of this utility model, the Fenton reaction unit for nickel-containing wastewater includes a pH adjustment tank 14, a mixing tank 15, a Fenton reaction tank 16, a neutralization tank 17, and a reaction sedimentation tank 18 connected sequentially by pipelines. The pH adjustment tank 14 is connected to an intermediate water tank 13 by pipelines, the supernatant of the reaction sedimentation tank 18 is connected to an intermediate water tank 19, and the sludge pipeline of the reaction sedimentation tank 18 is connected to a nickel-containing sludge tank 20 by pipelines. Specifically, as shown... Figure 2 As shown, the wastewater flowing out of intermediate water tank 13 first enters pH adjustment tank 14. By adding acid-base adjusters such as sulfuric acid or sodium hydroxide, the pH value of the wastewater is adjusted to the optimal range for the Fenton reaction. The adjusted wastewater flows into mixing tank 15, where it is thoroughly mixed with quantitatively added hydrogen peroxide and ferrous sulfate. Then it enters Fenton reaction tank 16 for advanced oxidation reaction to degrade the recalcitrant organic matter in the wastewater. The wastewater after the reaction enters neutralization tank 17, where the pH value is adjusted to neutral. Finally, it flows into reaction sedimentation tank 18, where the sludge generated by the reaction is precipitated and separated. The supernatant enters intermediate water tank 19, while the sludge is discharged into nickel-containing sludge tank 20.

[0027] In one embodiment of this utility model, the ion exchanger 22 is also connected to a self-regenerating medicine tank 6 via a pipeline, and two self-regenerating medicine tanks 6 are provided. Specifically, in conjunction with Figure 2 and Figure 3 As shown, the two self-regenerating tanks 6 store different regeneration agents, such as sulfuric acid and sodium hydroxide. After the ion exchanger 22 has been running for a period of time, the resin becomes saturated. At this time, by switching valves, the regeneration agents flow from the self-regenerating tanks 6 into the ion exchanger 22 in sequence to regenerate the resin. The two self-regenerating tanks 6 are used alternately, which not only improves the resin regeneration efficiency, but also ensures that the ion exchanger 22 can operate continuously and stably, thus guaranteeing the deep treatment effect of nickel-containing wastewater.

[0028] In one embodiment of this utility model, the nickel-containing wastewater equalization tank 10 is connected by a pipeline to the nickel-containing wastewater emergency tank 9, and the nickel-containing wastewater emergency tank 9 is also connected by a pipeline to the primary reaction sedimentation tank 11. Specifically, as shown... Figure 2 As shown, the nickel-containing wastewater emergency tank 9 is located near the nickel-containing wastewater equalization tank 10. The two are connected by a pipeline and an electric valve. When the water quality or quantity in the nickel-containing wastewater equalization tank 10 exceeds the normal treatment range, the electric valve will automatically open and discharge the wastewater into the nickel-containing wastewater emergency tank 9. A metering pump is installed on the pipeline connecting the nickel-containing wastewater emergency tank 9 and the primary reaction sedimentation tank 11. The pump can slowly transport the wastewater in the emergency tank to the primary reaction sedimentation tank 11 for treatment according to the treatment load of the primary reaction sedimentation tank 11, so as to prevent the stability of the entire treatment system from being affected by the impact of wastewater.

[0029] In one embodiment of this utility model, perforated aeration pipes 3 are provided on the inner walls of the nickel smelting wastewater equalization tank 2, the nickel smelting wastewater emergency tank 1, the nickel-containing wastewater equalization tank 10, the nickel-containing wastewater emergency tank 9, the pH equalization tank 14, the mixing tank 15, and the neutralization tank 17. The perforated aeration pipes 3 are connected to a self-regulating tank blower via pipelines. Specifically, as shown... Figures 1-2 As shown, the perforated aeration pipes 3 are evenly laid in a grid pattern on the bottom of the inner wall of each tank. The self-regulating tank blower is connected to the perforated aeration pipes 3 of each tank through the main pipeline and is equipped with a frequency converter. In different treatment stages, the air volume of the blower is adjusted by the frequency converter according to the process requirements to make the perforated aeration pipes 3 aerate evenly. In the wastewater conditioning stage, aeration can prevent the sedimentation of suspended solids; in the reaction stage, aeration can promote the full mixing of the reagents and wastewater, accelerate the reaction rate, and ensure that each treatment link is carried out efficiently.

[0030] Ni is a Class I pollutant. Controlling the pH of this type of wastewater to around 10-11 can generate stable hydroxide precipitates for removal. According to emission standards, it needs to be collected and treated separately to meet the standards before discharge. The principle is as follows:

[0031] Ni 2+ +20H - →Ni(OH) 2

[0032] In addition, hypophosphoric acid, phosphorous acid, and hypophosphorous acid in electroless nickel plating can form complex nickel, which can also cause excessive phosphorus levels. Chemical oxidation can destroy its structure and generate phosphate precipitates and nickel hydroxide precipitates.

[0033] The table below shows the predicted nickel removal rate in wastewater:

[0034]

[0035] Pretreatment stage: Through "adjustment-phosphorus removal-pH adjustment-electrochemical complex breaking", complexed nickel is converted into free nickel, while phosphorus and some organic matter are removed, reducing the load on subsequent treatments;

[0036] Main treatment stage: Deep removal of nickel ions is achieved through "stage precipitation - Fenton oxidation - MCR - ion exchange". Fenton oxidation breaks down residual complexing agents, MCR enhances the degradation of organic matter, and ion exchange ensures that the nickel concentration meets the standard.

[0037] Safety assurance mechanism: The accident pool and the perforated aeration pipe system form a double insurance of "water quality buffer - process stirring" to prevent the system from failing due to shock and ensure the continuity and stability of the treatment process.

[0038] In summary, this application achieves efficient treatment of complex nickel-containing wastewater through the scientific layout and coordinated operation of the nickel and zinc-nickel wastewater pretreatment unit and the nickel-containing wastewater treatment unit. From the working principle, each treatment unit has a clear division of labor and works closely together, sequentially performing water quality and quantity adjustment, phosphorus removal, pH adjustment, electrochemical reaction, precipitation, Fenton oxidation, neutralization, and ion exchange processes on the wastewater, effectively removing pollutants such as phosphorus, nickel, and organic matter from the wastewater. This equipment not only has excellent treatment effect, enabling the effluent to meet discharge standards, but also reduces operating costs through reasonable structural design and component configuration, such as the regeneration and utilization of ion exchange resin. At the same time, emergency tanks, staged sedimentation, and uniform aeration enhance the stability and reliability of the equipment.

[0039] All standard parts used in this invention can be purchased from the market, and irregularly shaped parts can be customized according to the description and drawings. The specific connection methods for each part all employ conventional methods such as bolts, rivets, and welding, which are mature technologies in the prior art. The machinery, parts, and equipment all use conventional models in the prior art, and the circuit connections also use conventional connection methods in the prior art, which will not be detailed here. Any content not described in detail in this specification belongs to the prior art known to those skilled in the art.

[0040] The present invention and its embodiments have been described above. This description is not restrictive, and the embodiments shown throughout the text are only one of the embodiments of the present invention. The actual structure is not limited to this. In conclusion, if a person skilled in the art is inspired by this description and designs a similar structure and embodiment without departing from the inventive spirit of the present invention, such design should fall within the protection scope of the present invention.

Claims

1. A nickel-containing wastewater treatment device for electroplating wastewater containing nickel and zinc-nickel electroplating, characterized in that, include: A pretreatment system for nickel and zinc-nickel wastewater includes a nickel wastewater equalization tank, a nickel dephosphorization reactor, a nickel pH equalization tank, an intermediate water tank, and an electrochemical reaction device. The nickel wastewater equalization tank, the nickel dephosphorization reactor, the nickel pH equalization tank, the intermediate water tank, and the electrochemical reaction device are connected sequentially by pipelines. A nickel-containing wastewater treatment facility includes a nickel-containing wastewater emergency tank, a nickel-containing wastewater equalization tank, a sedimentation tank, an intermediate water tank II, a nickel-containing wastewater Fenton reaction unit, an intermediate water tank III, a nickel-containing MCR, an ion exchanger, a nickel-containing wastewater monitoring tank, and a nickel-containing sludge tank. The nickel-containing wastewater emergency tank, the nickel-containing wastewater equalization tank, the sedimentation tank, the intermediate water tank II, the nickel-containing wastewater Fenton reaction unit, the intermediate water tank III, the nickel-containing MCR, the ion exchanger, and the nickel-containing wastewater monitoring tank are sequentially connected by pipelines. The nickel-containing sludge tank is connected by pipelines to the sludge pipelines of the sedimentation tank and the nickel-containing wastewater Fenton reaction unit. The ion exchanger is also connected to the pipeline of the nickel-containing wastewater equalization tank. After being treated, nickel-containing wastewater is converted into nickel-containing wastewater. The electrochemical reaction device is connected to the nickel-containing wastewater equalization tank through a pipeline, and the converted nickel-containing wastewater is sent to the nickel-containing wastewater treatment unit for further treatment.

2. The nickel-containing wastewater treatment equipment for electroplating wastewater containing electroless nickel and zinc-nickel plating according to claim 1, characterized in that: The nickel leaching wastewater equalization tank is connected to a nickel leaching wastewater emergency tank via a pipeline, and the nickel leaching wastewater emergency tank is also connected to the nickel leaching phosphorus removal reactor via a pipeline.

3. The nickel-containing wastewater treatment equipment for electroplating wastewater containing electroless nickel and zinc-nickel plating according to claim 2, characterized in that: The sedimentation tank includes a primary reaction sedimentation tank and a secondary reaction sedimentation tank.

4. The nickel-containing wastewater treatment equipment for electroplating wastewater containing electroless nickel and zinc-nickel plating according to claim 3, characterized in that: The nickel-containing wastewater Fenton reaction unit includes a pH adjustment tank, a mixing tank, a Fenton reaction tank, a neutralization tank, and a reaction sedimentation tank connected in sequence by pipelines. The pH adjustment tank is connected to the intermediate water tank by a second pipeline. The supernatant of the reaction sedimentation tank is connected to the intermediate water tank by a third pipeline for transportation. The sludge pipeline of the reaction sedimentation tank is connected to the nickel-containing sludge tank by a third pipeline.

5. The nickel-containing wastewater treatment equipment for electroplating wastewater containing electroless nickel and zinc-nickel plating according to claim 4, characterized in that: The ion exchanger is also connected to a self-regenerating medicine tank via a pipeline, and there are two self-regenerating medicine tanks.

6. The nickel-containing wastewater treatment equipment for electroplating wastewater containing electroless nickel and zinc-nickel plating according to claim 5, characterized in that: The nickel-containing wastewater equalization tank is connected to a nickel-containing wastewater emergency tank, which is also connected to the primary reaction sedimentation tank.

7. The nickel-containing wastewater treatment equipment for electroplating wastewater containing electroless nickel and zinc-nickel plating according to claim 6, characterized in that: The inner walls of the nickel-plating wastewater equalization tank, the nickel-plating wastewater emergency tank, the nickel-containing wastewater equalization tank, the nickel-containing wastewater emergency tank, the pH equalization tank, the mixing tank, and the neutralization tank are all equipped with perforated aeration pipes, and the perforated aeration pipes are connected to a self-regulating tank blower through pipelines.

Images