Device for removing total nickel in wastewater

Abstract

The utility model discloses a device for removing total nickel in wastewater, which belongs to the field of wastewater treatment and comprises a nickel-containing wastewater treatment unit and a complex nickel wastewater treatment unit. Wherein the nickel-containing wastewater treatment unit comprises a first regulating tank, a first alkaline regulating tank, a first alkaline adding device, a first coagulation reaction tank, a first PAC adding device, a first flocculation reaction tank, a first PAM adding device, a first sedimentation tank, a second acid regulating tank, a second acid adding device, a second intermediate water tank, a second sand filter tank and a second ion exchanger; and a second reservoir. The nickel-containing wastewater belongs to a class of pollutants, so that the nickel-containing wastewater must be independently collected and treated. By adopting the device, nickel ions in water can be removed, and the obtained wastewater can be mixed with other wastewater to be treated together, namely, the wastewater in the second reservoir can be treated together with other wastewater, so that the wastewater treatment cost is effectively reduced.

Description

Technical Field

[0001] The utility model relates to the field of wastewater treatment, in particular to the field of heavy metal ion removal, and specifically to a device for removing total nickel from wastewater. More specifically, the application provides a device for removing total nickel from wastewater based on a multi-grid reactor. Background Art

[0002] Chemical nickel plating is the most widely used nickel plating technology at present. It can greatly improve the wear resistance, corrosion resistance, stability of plated parts, and make the plated parts more beautiful. At the same time, nickel also has potential harm to the ecosystem. It will not only be enriched in the soil, affecting the normal growth of crops, but also remain in the water, affecting fishery production. Furthermore, nickel will form light-based nickel with light-based compounds in water, which is more toxic. If it enters the human body through the food chain, it will have adverse effects on the human body. Therefore, how to remove nickel from wastewater has become an urgent problem that needs to be solved.

[0003] To this end, people have conducted a lot of research. For example, Chinese patent application CN202311849972.3 discloses a nickel-containing wastewater treatment equipment, which includes a mixing box, a processing box, and a connecting piece, the connecting piece is used to connect the mixing box and the processing box, the inner wall of the mixing box is provided with a filter plate, a mounting rod is provided in the processing box, an electromagnetic plate is provided on the mounting rod, the electromagnetic plate is electrically connected to the power supply, and the electromagnetic plate generates magnetism to adsorb the fixed nickel after being energized, and also includes a lifting member, the lifting member is used to drive the mounting rod to move along the length direction of the processing box, a material receiving box is provided on one side of the processing box, and the material receiving box is used to collect solid nickel, a frame is provided between the processing box and the material receiving box, the mounting rod is slidably connected to the frame, and a moving member is provided on the frame, and the moving member is used to drive the mounting rod to move along the frame so that the mounting rod moves to the upper side of the material receiving box. In this scheme, the wastewater is first filtered through the filter plate in the mixing box so that the solid debris in the wastewater is deposited on the filter plate. When the connecting piece passes the wastewater in the mixing box into the treatment box, a chelating agent is added to the treatment box so that the nickel ions in the treatment box react into solid nickel. The installation rod is then driven to move along the length direction of the treatment box by the lifting piece so that the installation rod extends into the interior of the treatment box. The electromagnetic plate is then energized to generate magnetism to adsorb the solid nickel in the wastewater in the treatment box. The installation rod is then detached from the interior of the treatment box by the lifting piece. The installation rod is then driven to move to the upper side of the receiving box by the moving piece. The installation rod is then extended into the interior of the receiving box by the lifting piece. At this time, the electromagnetic plate is powered off so that the solid nickel adsorbed on the electromagnetic plate is detached and falls into the interior of the receiving box, thereby recovering the nickel in the wastewater and saving waste of resources.

[0004] Chinese patent application CN202311757169.7 discloses a method for treating wastewater containing nickel and cobalt ions, which uses WP-2 resin for adsorption, Versatic10 extractant and Mextral6103H extractant as composite extractants for synergistic extraction, and cooperates with the unique design of the present invention "2-stage extraction + 1-stage washing + 2-stage stripping" to accurately separate the impurity elements except nickel and cobalt in the wastewater step by step, and then perform nickel and cobalt impurity separation, so as to recover nickel and cobalt materials.

[0005] Chinese patent application CN202311612009.3 discloses a device and method for treating nickel-containing electroplating wastewater, which includes a filter barrel and a reaction barrel. The filter barrel is provided with a first stirring mechanism, which can stir the wastewater in the barrel body, so that the activated carbon in the filter grid is in full contact with the wastewater, thereby improving the adsorption effect of the activated carbon. The upper surface of the filter grid is a filter mesh to prevent solid matter from blocking the activated carbon, thereby ensuring the adsorption effect of the activated carbon on metal ions in the wastewater.

[0006] Among the existing methods, nickel-containing wastewater or chemical nickel wastewater is mainly treated separately. How to achieve effective treatment of nickel has always been an urgent problem that needs to be solved. Utility Model Content

[0007] The utility model aims to provide a device for removing total nickel from waste water.

[0008] In order to achieve the above purpose, this application adopts the following technical solutions:

[0009] A device for removing total nickel from wastewater, comprising a nickel-containing wastewater treatment unit and a complex nickel wastewater treatment unit;

[0010] The nickel-containing wastewater treatment unit comprises:

[0011] A first regulating tank, which is used to perform average and average treatment on the nickel-containing wastewater to be treated;

[0012] A first alkaline regulating tank, which is connected to the first regulating tank and the wastewater in the first regulating tank can enter the first alkaline regulating tank for treatment;

[0013] A first alkaline adding device, which is connected to the first alkaline regulating tank and can add alkaline materials into the first alkaline regulating tank to adjust the pH value of the wastewater to alkaline;

[0014] A first coagulation reaction tank, which is connected to the first alkaline regulating tank and the wastewater in the first alkaline regulating tank can enter the first coagulation reaction tank for coagulation treatment;

[0015] A first PAC adding device, which is connected to the first coagulation reaction tank and can add coagulant polyaluminium chloride into the first coagulation reaction tank;

[0016] A first flocculation reaction tank, which is connected to the first coagulation reaction tank and the wastewater in the first coagulation reaction tank can enter the first flocculation reaction tank for flocculation treatment;

[0017] A first PAM adding device, which is connected to the first flocculation reaction tank and can add flocculant polyacrylamide into the first flocculation reaction tank;

[0018] A first sedimentation tank, which is connected to the first flocculation reaction tank and the wastewater in the first flocculation reaction tank can enter the first sedimentation tank for sedimentation treatment;

[0019] A second acidic regulating tank is connected to the first sedimentation tank and the wastewater in the first sedimentation tank can enter the second acidic regulating tank for treatment to obtain second sedimentation sludge and second liquid respectively;

[0020] A second acid addition device, which is connected to the second acid adjustment tank and can add acidic materials into the second acid adjustment tank;

[0021] A second intermediate water tank, which is connected to the second acidic regulating tank and into which the second liquid treated in the second acidic regulating tank can be sent;

[0022] A second sand filter tank is connected to the second intermediate water tank and the fluid in the second intermediate water tank can enter the second sand filter tank for filtration to obtain a second filtrate;

[0023] A second ion exchanger is connected to the second sand filter tank and the second filtrate in the second sand filter tank can enter the second ion exchanger for ion exchange treatment to obtain a second exchange liquid;

[0024] A second water reservoir, which is connected to the second ion exchanger and the second exchange liquid produced by the second ion exchanger can be sent to the second water reservoir;

[0025] The complex nickel wastewater treatment unit comprises:

[0026] The third regulating tank is used for treating the complex nickel wastewater to be treated by average value and amount;

[0027] A third network breaking reaction tank, which is connected to the third regulating tank and the wastewater in the third regulating tank can enter the third network breaking reaction tank for network breaking treatment;

[0028] A third sodium chlorate adding device, which is connected to the third complex breaking reaction tank and can add sodium hypochlorite into the third complex breaking reaction tank;

[0029] A third acid adding device, which is connected to the third complex breaking reaction tank and can add acidic materials into the third complex breaking reaction tank;

[0030] The third alkaline regulating tank is connected to the third chelation breaking reaction tank and the wastewater in the third chelation breaking reaction tank can enter the third alkaline regulating tank for treatment;

[0031] A third alkaline adding device, which is connected to the third alkaline regulating tank and can add alkaline materials into the third alkaline regulating tank;

[0032] A third coagulation reaction tank is connected to the third alkaline regulating tank and the wastewater in the third alkaline regulating tank can enter the third coagulation reaction tank for coagulation treatment;

[0033] A third PAC adding device, which is connected to the third coagulation reaction tank and can add coagulant polyaluminium chloride into the third coagulation reaction tank;

[0034] A third flocculation reaction tank, which is connected to the third coagulation reaction tank and the wastewater in the third coagulation reaction tank can enter the third flocculation reaction tank for flocculation treatment;

[0035] A third PAM adding device, which is connected to the third flocculation reaction tank and can add flocculant polyacrylamide into the third flocculation reaction tank;

[0036] A third sedimentation tank is connected to the third flocculation reaction tank and the wastewater in the third flocculation reaction tank can enter the third sedimentation tank for sedimentation treatment to obtain third sedimentation sludge and third liquid respectively;

[0037] The fourth sludge tank is connected to the second acidic regulating tank and the third sedimentation tank respectively, and the second sedimentation sludge in the second acidic regulating tank and the third sedimentation sludge in the third sedimentation tank can enter the fourth sludge tank;

[0038] The third sedimentation tank is connected to the second intermediate water tank and the third liquid in the third sedimentation tank can enter the second intermediate water tank.

[0039] The alkaline material added by the first alkaline adding device is one of sodium hydroxide, potassium hydroxide and calcium oxide.

[0040] The acidic material added by the second acid adding device is one of sulfuric acid and hydrochloric acid.

[0041] The acidic material added by the third acid adding device is one of sulfuric acid and hydrochloric acid.

[0042] The alkaline material added by the third alkaline adding device is one of sodium hydroxide, potassium hydroxide and calcium oxide.

[0043] The first sedimentation tank and the third sedimentation tank are inclined tube sedimentation tanks respectively.

[0044] The first coagulation reaction tank is connected to the first flocculation reaction tank and constitutes a first multi-grid reactor;

[0045] The third coagulation reaction tank is connected to the third flocculation reaction tank to form a third multi-grid reactor. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 Schematic diagram of the structure of the device for removing total nickel from wastewater in the embodiment.

[0047] Markings in the figure: 1. the first regulating tank, 2. the first alkaline regulating tank, 3. the first alkaline adding device, 4. the first PAC adding device, 5. the first PAM adding device, 6. the first sedimentation tank, 7. the second acidic regulating tank, 8. the second acidic adding device, 9. the second intermediate water tank, 10. the second sand filter tank, 11. the second ion exchanger, 12. the second water storage tank, 13. the third regulating tank, 14. the third complex breaking reaction tank, 15. the third sodium chlorate adding device, 16. the third acidic adding device, 17. the third alkaline regulating tank, 18. the third alkaline adding device, 19. the third PAC adding device, 20. the third PAM adding device, 21. the third sedimentation tank, 22. the fourth sludge tank. DETAILED DESCRIPTION

[0048] The utility model is described in detail below in conjunction with the accompanying drawings.

[0049] In order to more clearly illustrate the technical solutions of the embodiments of this specification, the following is a brief introduction to the drawings required for the description of the embodiments. Obviously, the drawings described below are only some examples or embodiments of this specification. For ordinary technicians in this field, this specification can also be applied to other similar scenarios based on these drawings without creative work. Unless it is obvious from the language environment or otherwise explained, the same reference numerals in the figures represent the same structure or operation.

[0050] 1. Processing device

[0051] This embodiment provides a device for removing total nickel from wastewater, which includes a nickel-containing wastewater treatment unit and a complex nickel wastewater treatment unit. The nickel-containing wastewater treatment unit includes a first regulating tank, a first alkaline regulating tank, a first alkaline adding device, a first coagulation reaction tank, a first PAC adding device, a first flocculation reaction tank, a first PAM adding device, a first sedimentation tank, a second acid regulating tank, a second acid adding device, a second intermediate water tank, a second sand filter tank, a second ion exchanger, and a second water storage tank.

[0052] The nickel-containing wastewater is sent to the first regulating tank, which is used to treat the nickel-containing wastewater to be treated by average and average amount. The first regulating tank is connected to the first alkaline regulating tank, and the first alkaline adding device is connected to the first alkaline regulating tank; the first alkaline regulating tank is connected to the first coagulation reaction tank, and the first PAC adding device is connected to the first coagulation reaction tank; the first coagulation reaction tank is connected to the first flocculation reaction tank, and the first PAM adding device is connected to the first flocculation reaction tank. The first flocculation reaction tank is connected to the first sedimentation tank; the second acid adding device is connected to the second acid regulating tank, and the second acid adding device is used to add acidic materials to the second acid regulating tank; the first sedimentation tank is connected to the second acid regulating tank, and the second sedimentation sludge and the second liquid are obtained respectively; the second acid regulating tank is connected to the second intermediate water tank.

[0053] The complex nickel wastewater treatment unit includes a third regulating tank, a third complex breaking reaction tank, a third sodium chlorate adding device, a third acid adding device, a third alkaline regulating tank, a third alkaline adding device, a third coagulation reaction tank, a third PAC adding device, a third flocculation reaction tank, a third PAM adding device, a third sedimentation tank, and a fourth sludge tank.

[0054] The complex nickel wastewater to be treated is sent to the third regulating tank, and the third regulating tank is used to treat the complex nickel wastewater to be treated by average and average amount. The third regulating tank is connected to the third complex breaking reaction tank, and the third sodium chlorate addition device and the third acid addition device are respectively connected to the third complex breaking reaction tank. The third alkaline addition device is connected to the third alkaline regulating tank, and the third complex breaking reaction tank is connected to the third alkaline regulating tank. The third alkaline regulating tank is connected to the third coagulation reaction tank, and the third PAC addition device is connected to the third coagulation reaction tank; the third coagulation reaction tank is connected to the third flocculation reaction tank, and the third PAM addition device is connected to the third flocculation reaction tank. The third flocculation reaction tank is connected to the third sedimentation tank, and the third sedimentation sludge and the third liquid are obtained respectively. The fourth sludge tank is respectively connected to the second acidic regulating tank and the third sedimentation tank, and the third sedimentation tank is connected to the second intermediate water tank.

[0055] At the same time, the second intermediate water tank is connected to the second sand filter tank, the second sand filter tank is connected to the second ion exchanger, and the second ion exchanger is connected to the second water reservoir.

[0056] Further, in one example, the first sedimentation tank and the third sedimentation tank are inclined tube sedimentation tanks. In one example, the first coagulation reaction tank is connected to the first flocculation reaction tank and constitutes a first multi-grid reactor, and the third coagulation reaction tank is connected to the third flocculation reaction tank and constitutes a third multi-grid reactor. The design of the first multi-grid reactor and the third multi-grid reactor is conducive to reducing the volume of the device and reducing the equipment cost.

[0057] The process of treating wastewater using this device is as follows.

[0058] (1) The wastewater in the first regulating tank is sent to the first alkaline regulating tank for treatment. The first alkaline adding device is used to add alkaline materials to the first alkaline regulating tank to adjust the pH value of the wastewater to alkaline. In a specific example, the alkaline material added by the first alkaline adding device is sodium hydroxide. The first PAC adding device is used to add coagulant polyaluminium chloride to the first coagulation reaction tank, and the wastewater in the first alkaline regulating tank is sent to the first coagulation reaction tank for coagulation treatment; the first PAM adding device is used to add flocculant polyacrylamide to the first flocculation reaction tank, and the wastewater in the first coagulation reaction tank can enter the first flocculation reaction tank for flocculation treatment. The wastewater in the first sedimentation tank enters the second acidic regulating tank for treatment, and obtains the second sedimentation sludge and the second liquid respectively. The second liquid treated in the second acidic regulating tank is sent to the second intermediate water tank.

[0059] (2) The wastewater in the third regulating tank enters the third decomposition reaction tank for decomposition treatment; the third sodium chlorate adding device is used to add sodium hypochlorite to the third decomposition reaction tank, and the third acid adding device is used to add acidic materials to the third decomposition reaction tank. In a specific example, the acidic material added by the third acid adding device is sulfuric acid. The third alkaline adding device is used to add alkaline materials to the third alkaline regulating tank, and the wastewater in the third decomposition reaction tank is sent to the third alkaline regulating tank for treatment. In a specific example, the alkaline material added to the third alkaline regulating tank is sodium hydroxide. The third PAC adding device is used to add coagulant polyaluminum chloride to the third coagulation reaction tank, and the wastewater in the third alkaline regulating tank is sent to the third coagulation reaction tank for coagulation treatment; the third PAM adding device is used to add flocculant polyacrylamide to the third flocculation reaction tank, and the wastewater in the third coagulation reaction tank is sent to the third flocculation reaction tank for flocculation treatment. The wastewater in the third flocculation reaction tank is sent to the third sedimentation tank for sedimentation treatment, and the third sedimentation sludge and the third liquid are obtained respectively. The second sedimentation sludge in the second acid adjustment tank and the third sedimentation sludge in the third sedimentation tank are respectively sent to the fourth sludge tank; the third liquid in the third sedimentation tank is sent to the second intermediate water tank.

[0060] (3) The fluid in the second intermediate water tank is sent to the second sand filter tank for filtration to obtain a second filtrate. The second filtrate in the second sand filter tank is sent to the second ion exchanger for ion exchange treatment to obtain a second exchange liquid. The second exchange liquid produced by the second ion exchanger can be sent to the second water storage tank.

[0061] (II) Processing principle

[0062] In this application, nickel-containing wastewater refers to nickel activation cleaning water, nickel anode cleaning water, and electroplating nickel rinsing water mainly generated from the nickel plating process. The main pollutants are nickel, COD, ammonia nitrogen, etc. The nickel in the nickel-containing wastewater exists in the form of ions.

[0063] The nickel in nickel-containing wastewater exists in the form of ions. The pH of the wastewater is adjusted to the alkaline range through the first alkaline regulating tank to generate nickel hydroxide precipitate. The heavy metals and some organic matter are separated in the first sedimentation tank through the coagulation and flocculation of PAC and PAM, thereby reducing the nickel ions in the water. The clean water after coagulation and sedimentation separation enters the second intermediate water tank.

[0064] Complex nickel wastewater mainly comes from chemical nickel plating waste liquid and chemical nickel plating cleaning water, and the wastewater mainly contains pollutants such as nickel, copper, phosphorus, and ammonia nitrogen. The nickel in complex nickel wastewater mainly exists in a complex state; in this application, the chemical nickel complex is broken by adding a complex-breaking agent, and the nickel after the complex is broken exists in an ionic state, and then the pH value of the wastewater is adjusted to an alkaline range to generate nickel hydroxide precipitation, and the heavy metals and some organic matter in the wastewater are separated in the sedimentation tank through coagulation and flocculation, thereby reducing the nickel ions in the water, and the clean water after coagulation and sedimentation separation enters the second intermediate water tank.

[0065] Since nickel-containing wastewater belongs to a class of pollutants, it must be collected and treated separately. After the nickel ions in the water are removed, the wastewater can be mixed with other wastewater and treated together, that is, the wastewater in the second reservoir can be treated together with other wastewater.

[0066] Example 1

[0067] The nickel-containing electroplating wastewater of a certain factory was treated. The nickel concentration of the nickel-containing wastewater was 97 mg / L and the COD concentration was 45 mg / L; the nickel concentration of the complex nickel (chemical nickel) wastewater was 150 mg / L and the COD concentration was 310 mg / L.

[0068] The wastewater was treated using the aforementioned device, and the nickel concentration in the water in the second reservoir was 0.08 mg / L.

[0069] Example 2

[0070] The electroplating wastewater of a certain factory was treated, in which the nickel concentration of the nickel-containing wastewater was 168 mg / L and the COD concentration was 126 mg / L. The wastewater was treated using the above-mentioned device, and the nickel concentration in the water in the second water reservoir was 0.1 mg / L.

[0071] Example 3

[0072] The chemical nickel wastewater from a factory was treated, with the nickel concentration being 104 mg / L and the COD concentration being 86 mg / L.

[0073] The wastewater was treated using the above-mentioned device. The nickel concentration in the water in the second reservoir was 0.07 mg / L, and the COD concentration was 76 mg / L.

[0074] Example 4

[0075] The electroplating wastewater of a certain factory was treated, among which the nickel concentration of the nickel-containing wastewater was 182 mg / L and the COD concentration was 120 mg / L; the nickel concentration of the complex nickel wastewater was 210 mg / L and the COD concentration was 184 mg / L.

[0076] The wastewater was treated using the aforementioned device, and the nickel concentration in the water in the second reservoir was 0.1 mg / L.

[0077] The device of the present application can be used for the treatment of nickel-containing wastewater in the electroplating industry, the circuit board industry, and other industrial production, and has high application value and good application prospects.

[0078] The basic concepts have been described above. Obviously, for those skilled in the art, the above detailed disclosure is only for example and does not constitute a limitation of this specification. Although not explicitly stated here, those skilled in the art may make various modifications, improvements and corrections to this specification. Such modifications, improvements and corrections are suggested in this specification, so such modifications, improvements and corrections still belong to the spirit and scope of the exemplary embodiments of this specification.

[0079] Finally, it should be understood that the embodiments described in this specification are only used to illustrate the principles of the embodiments of this specification. Other variations may also fall within the scope of this specification. Therefore, as an example and not a limitation, alternative configurations of the embodiments of this specification may be considered consistent with the teachings of this specification. Accordingly, the embodiments of this specification are not limited to the embodiments explicitly introduced and described in this specification.

[0080] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for removing total nickel from wastewater, characterized in that: Including nickel-containing wastewater treatment unit and complex nickel wastewater treatment unit; The nickel-containing wastewater treatment unit comprises: A first regulating tank, which is used to perform average and average treatment on the nickel-containing wastewater to be treated; A first alkaline regulating tank, which is connected to the first regulating tank and the wastewater in the first regulating tank can enter the first alkaline regulating tank for treatment; A first alkaline adding device, which is connected to the first alkaline regulating tank and can add alkaline materials into the first alkaline regulating tank to adjust the pH value of the wastewater to alkaline; A first coagulation reaction tank, which is connected to the first alkaline regulating tank and the wastewater in the first alkaline regulating tank can enter the first coagulation reaction tank for coagulation treatment; A first PAC adding device, which is connected to the first coagulation reaction tank and can add coagulant polyaluminium chloride into the first coagulation reaction tank; A first flocculation reaction tank, which is connected to the first coagulation reaction tank and the wastewater in the first coagulation reaction tank can enter the first flocculation reaction tank for flocculation treatment; A first PAM adding device, which is connected to the first flocculation reaction tank and can add flocculant polyacrylamide into the first flocculation reaction tank; A first sedimentation tank, which is connected to the first flocculation reaction tank and the wastewater in the first flocculation reaction tank can enter the first sedimentation tank for sedimentation treatment; A second acidic regulating tank is connected to the first sedimentation tank and the wastewater in the first sedimentation tank can enter the second acidic regulating tank for treatment to obtain second sedimentation sludge and second liquid respectively; A second acid addition device, which is connected to the second acid adjustment tank and can add acidic materials into the second acid adjustment tank; A second intermediate water tank, which is connected to the second acidic regulating tank and into which the second liquid treated in the second acidic regulating tank can be sent; A second sand filter tank is connected to the second intermediate water tank and the fluid in the second intermediate water tank can enter the second sand filter tank for filtration to obtain a second filtrate; A second ion exchanger is connected to the second sand filter tank and the second filtrate in the second sand filter tank can enter the second ion exchanger for ion exchange treatment to obtain a second exchange liquid; A second water reservoir, which is connected to the second ion exchanger and the second exchange liquid produced by the second ion exchanger can be sent to the second water reservoir; The complex nickel wastewater treatment unit comprises: The third regulating tank is used for treating the complex nickel wastewater to be treated by average value and amount; A third network breaking reaction tank, which is connected to the third regulating tank and the wastewater in the third regulating tank can enter the third network breaking reaction tank for network breaking treatment; A third sodium chlorate adding device, which is connected to the third complex breaking reaction tank and can add sodium hypochlorite into the third complex breaking reaction tank; A third acid adding device, which is connected to the third decomposition reaction tank and can add acidic materials into the third decomposition reaction tank; The third alkaline regulating tank is connected to the third chelation breaking reaction tank and the wastewater in the third chelation breaking reaction tank can enter the third alkaline regulating tank for treatment; A third alkaline adding device, which is connected to the third alkaline regulating tank and can add alkaline materials into the third alkaline regulating tank; A third coagulation reaction tank is connected to the third alkaline regulating tank and the wastewater in the third alkaline regulating tank can enter the third coagulation reaction tank for coagulation treatment; A third PAC adding device, which is connected to the third coagulation reaction tank and can add coagulant polyaluminium chloride into the third coagulation reaction tank; A third flocculation reaction tank, which is connected to the third coagulation reaction tank and the wastewater in the third coagulation reaction tank can enter the third flocculation reaction tank for flocculation treatment; A third PAM adding device, which is connected to the third flocculation reaction tank and can add flocculant polyacrylamide into the third flocculation reaction tank; A third sedimentation tank is connected to the third flocculation reaction tank and the wastewater in the third flocculation reaction tank can enter the third sedimentation tank for sedimentation treatment to obtain third sedimentation sludge and third liquid respectively; The fourth sludge tank is connected to the second acidic regulating tank and the third sedimentation tank respectively, and the second sedimentation sludge in the second acidic regulating tank and the third sedimentation sludge in the third sedimentation tank can enter the fourth sludge tank; The third sedimentation tank is connected to the second intermediate water tank and the third liquid in the third sedimentation tank can enter the second intermediate water tank.

2. The device for removing total nickel from wastewater according to claim 1, characterized in that: The alkaline material added by the first alkaline adding device is one or more of sodium hydroxide, potassium hydroxide and calcium oxide.

3. The device for removing total nickel from wastewater according to claim 1, characterized in that: The acidic material added by the second acid adding device is one of sulfuric acid and hydrochloric acid.

4. The device for removing total nickel from wastewater according to claim 1, characterized in that: The acidic material added by the third acid adding device is one of sulfuric acid and hydrochloric acid.

5. The device for removing total nickel from wastewater according to claim 1, characterized in that: The alkaline material added by the third alkaline adding device is one of sodium hydroxide, potassium hydroxide and calcium oxide.

6. The device for removing total nickel from wastewater according to any one of claims 1 to 5, characterized in that: The first sedimentation tank and the third sedimentation tank are inclined tube sedimentation tanks respectively.

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