Electroplating nickel-containing wastewater treatment system

Abstract

The utility model discloses an electroplating nickel-containing wastewater treatment system which comprises a wastewater collection system, a pretreatment system, a separation system, a concentration system, a hyperconcentration system and a sludge treatment system. The system is high in automation degree and convenient to operate, the process is superior to the traditional process, the conductivity of fresh water generated by the system reaches below 200us / cm, and the fresh water can be reused in a rinsing bath of an electroplating production line; the concentration of nickel contained in the concentrated solution is not lower than 40g / L, and the concentrated solution can be reused in a production line electroplating mother bath.

Description

Technical Field

[0001] The utility model belongs to the technical field of wastewater treatment, and in particular relates to a system for treating electroplating nickel-containing wastewater. Background Art

[0002] Nickel-containing wastewater mainly comes from the rinsing water of the nickel plating section of the electroplating production line. If it is discharged into the water body without effective treatment, it will have a serious impact on the environment and human health. In addition, due to the high price of nickel and the continuous reduction of nickel resources, nickel-containing wastewater has a high recycling value. If the electroplating nickel-containing wastewater can be recycled, it can not only reduce pollution to the environment, but also reduce the production cost of enterprises, save water resources and promote the level of clean production in the industry.

[0003] Membrane concentration separation technology has been widely used in the treatment of heavy metal wastewater. Generally, the concentration limit of heavy metal wastewater using reverse osmosis membrane alone is relatively large, and the concentration of the concentrated solution after concentration is difficult to reach the concentration of the plating solution in the electroplating mother tank. Summary of the invention

[0004] The utility model aims to provide a nickel-containing electroplating wastewater treatment system to separate and concentrate the nickel-containing electroplating wastewater, so that the concentrated liquid can be reused in the electroplating mother tank of the production line, and the fresh water can be reused in the water washing tank of the electroplating production line.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A nickel-containing electroplating wastewater treatment system comprises a wastewater collection system, a pretreatment system, a separation system, a concentration system, a superconcentration system and a sludge treatment system; the wastewater collection system comprises a wastewater collection tank and a collection tank lift pump; the pretreatment system comprises a microfiltration concentration water tank, a microfiltration circulation pump, a microfiltration membrane device, a microfiltration water production tank, a microfiltration booster pump and a carbon filter; the separation system comprises a security filter, a separation high-pressure pump, a separation device, a fresh water tank and a fresh water reuse pump; the concentration system comprises a concentration water tank, a concentration high-pressure pump and a concentration device; the superconcentration system comprises a superconcentration water tank, a superconcentration high-pressure pump, a superconcentration device, a superconcentration booster pump, a concentrate collection tank and a concentrate reuse pump; the sludge treatment system comprises a sludge tank, a sludge pump and a sludge dewatering machine.

[0007] The outlet of the wastewater collection tank is connected to the inlet of the collection tank lifting pump; the outlet of the collection tank lifting pump is connected to the inlet of the microfiltration concentration water tank; the outlet of the microfiltration concentration water tank is connected to the inlet of the microfiltration circulation pump; the outlet of the microfiltration circulation pump is connected to the water inlets of the microfiltration membrane device and the sludge tank respectively; the fresh water outlet of the microfiltration membrane device is connected to the inlet of the microfiltration water production tank, and the concentrated water outlet of the microfiltration membrane device is connected to the inlet of the microfiltration concentration water tank; the outlet of the microfiltration water production tank is connected to the microfiltration water production tank. The water inlet of the booster pump of the microfiltration water production tank is connected; the water outlet of the booster pump of the microfiltration water production tank is connected to the water inlet of the carbon filter; the water outlet of the carbon filter is connected to the water inlet of the security filter; the water outlet of the security filter is connected to the water inlet of the separation high-pressure pump; the water outlet of the separation high-pressure pump is connected to the water inlet of the separation device; the fresh water outlet of the separation device is connected to the water inlet of the fresh water tank, and the concentrated water outlet of the separation device is connected to the water inlet of the concentrated water tank; the water outlet of the concentrated water tank is connected to the water inlet of the concentrated high-pressure pump The water outlet of the concentration high-pressure pump is connected to the water inlet of the concentrating device; the fresh water outlet of the concentrating device is connected to the water inlet of the microfiltration water production tank, and the concentrated water outlet of the concentrating device is connected to the water inlet of the super-concentrated water tank; the water outlet of the super-concentrated water tank is respectively connected to the water inlets of the super-concentrated high-pressure pump and the super-concentrated water tank booster pump; the water outlet of the super-concentrated high-pressure pump is connected to the water inlet of the super-concentrated device; the fresh water outlet of the super-concentrated device is connected to the water inlet of the concentrated water tank, and the concentrated water outlet of the super-concentrated device is connected to the water inlet of the super-concentrated water tank. The water inlet of the concentrated water tank is connected; the water outlet of the fresh water tank is connected to the water inlet of the fresh water reuse pump; the water outlet of the fresh water reuse pump is connected to the water washing tank of the production line; the water outlet of the super concentrated water tank booster pump is connected to the water inlet of the concentrate collecting tank; the water outlet of the concentrate collecting tank is connected to the water inlet of the concentrate reuse pump; the water outlet of the concentrate reuse pump is connected to the electroplating mother tank of the production line; the water outlet of the sludge tank is connected to the water inlet of the sludge pump; the water outlet of the sludge pump is connected to the water inlet of the sludge dewatering machine.

[0008] As a further preferred embodiment of the present invention, a bottom valve is provided at the bottom of the water inlet pipeline of the collection tank lifting pump.

[0009] As a further preferred embodiment of this solution, the pretreatment system uses a microfiltration membrane device and a carbon filter to filter the wastewater.

[0010] As a further preferred embodiment of this scheme, the wastewater in the microfiltration concentration water tank is sent to the microfiltration membrane device through a microfiltration circulation pump for circulation filtration, and the final waste liquid in the microfiltration concentration water tank is regularly discharged into the sludge pool through the microfiltration circulation pump for subsequent dehydration treatment.

[0011] As a further preferred embodiment of the present invention, the separation device uses a brackish water desalination reverse osmosis membrane to separate the wastewater; and the concentration device and the superconcentration device both use D series nanofiltration membranes to concentrate the wastewater.

[0012] As a further preferred embodiment of the present invention, the fresh water tank is used to collect fresh water from the separation device, and the conductivity is below 200 us / cm, which can be reused in the water washing tank of the electroplating production line.

[0013] As a further preferred embodiment of this scheme, the wastewater in the super-concentrated water tank is sent to a super-concentrated device through a super-concentrated high-pressure pump for circulating concentration treatment, and the nickel concentration of the concentrate is not less than 40g / L. Finally, it is sent to a concentrate collection tank through a super-concentrated water tank booster pump for collection and reuse in the production line electroplating mother tank.

[0014] As a further preferred embodiment of the present invention, both the fresh water recycling pump and the concentrated liquid recycling pump are variable frequency constant pressure pumps; a ball valve is provided on the outlet pipe of the fresh water recycling pump and near the water washing tank of the production line to control the recycled water entering the water washing tank; a ball valve is provided on the outlet pipe of the concentrated liquid recycling pump and near the electroplating mother tank of the production line to control the tank liquid entering the electroplating mother tank.

[0015] As a further preferred embodiment of this solution, the sewage generated by the sludge dewatering machine is returned to the wastewater collection tank, and the generated sludge is entrusted to a professional organization for disposal as hazardous waste.

[0016] As a further preferred embodiment of the present scheme, a liquid level control system is provided in the wastewater collection tank to control the start and stop of the collection tank lifting pump; a liquid level control system is provided in the microfiltration concentration water tank to control the start and stop of the microfiltration circulation pump; a liquid level control system is provided in the microfiltration production water tank to control the start and stop of the microfiltration production water tank booster pump and the separation high-pressure pump; a liquid level control system is provided in the fresh water tank to control the start and stop of the separation high-pressure pump and the fresh water reuse pump; a liquid level control system is provided in the concentrated water tank to control the start and stop of the concentrated high-pressure pump; a liquid level gauge is provided in the super-concentrated water tank to control the start and stop of the super-concentrated high-pressure pump and the super-concentrated water tank booster pump; a liquid level control system is provided in the concentrated liquid collection tank to control the start and stop of the super-concentrated water tank booster pump and the concentrated liquid reuse pump; and a liquid level control system is provided in the sludge tank to control the start and stop of the sludge pump.

[0017] The beneficial effects of the utility model are as follows:

[0018] (1) A bottom valve is installed at the bottom of the water inlet pipe of the collection tank lifting pump to prevent water from flowing back into the pump and reduce the inflow of debris, thereby reducing the risk of system blockage.

[0019] (2) Use microfiltration membrane device and carbon filter as wastewater pretreatment system to filter wastewater. Microfiltration membrane device mainly uses microporous membrane to intercept and separate suspended solids with particle size greater than or equal to its pore size (50-1000nm). The diameter of nickel ion is 0.110-0.138nm, which can be separated by microfiltration membrane device and enter the microfiltration water production tank; and microfiltration membrane device can save sedimentation tank and multi-media filtration, without adding flocculant. Through the concentration effect of tubular membrane, there is enough suspended matter in the concentration tank to promote co-precipitation. The overall sludge volume is generally less than that of traditional process, and the concentration is higher. It can be directly sent to the sludge dewatering machine without further concentration. Carbon filter is mainly used to remove organic matter and avoid organic matter fouling the membrane.

[0020] (3) The separation device uses a brackish water desalination reverse osmosis membrane, and the conductivity of the generated fresh water reaches below 200us / cm, which can be reused in the water washing tank of the electroplating production line.

[0021] (4) Both the concentration device and the super-concentration device use nanofiltration membranes to concentrate the wastewater, which can not only intercept divalent nickel ions, but also reduce the pressure requirements for high-pressure pumps and pipelines compared to seawater desalination membranes. The nickel concentration of the concentrate is not less than 40g / L and can be reused in the electroplating master tank of the production line.

[0022] (5) Both the fresh water recycling pump and the concentrated liquid recycling pump use variable frequency constant pressure pumps. The recycling of fresh water and concentrated liquid only requires opening the corresponding ball valve for control. This not only protects the recycling pump, but also has a high degree of system automation.

[0023] (6) The wastewater collection tank, microfiltration concentration water tank, microfiltration water production tank, concentration water tank, super concentration water tank, fresh water tank and concentrate collection tank are all equipped with a liquid level control system to control the start and stop of the pump, thereby realizing the automated operation of the wastewater treatment system. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The utility model discloses a process flow chart of a nickel-containing electroplating wastewater treatment system.

[0025] Numbers in the figure: 1 is a wastewater collection tank, 2 is a collection tank lifting pump, 3 is a microfiltration concentration water tank, 4 is a microfiltration circulation pump, 5 is a microfiltration membrane device, 6 is a microfiltration water production tank, 7 is a microfiltration water production tank booster pump, 8 is a carbon filter, 9 is a security filter, 10 is a separation high-pressure pump, 11 is a separation device, 12 is a fresh water tank, 13 is a fresh water reuse pump, 14 is a concentration water tank, 15 is a concentration high-pressure pump, 16 is a concentration device, 17 is a super-concentrated water tank, 18 is a super-concentrated high-pressure pump, 19 is a super-concentrated device, 20 is a super-concentrated water tank booster pump, 21 is a concentrate collection tank, 22 is a concentrate reuse pump, 23 is a sludge tank, 24 is a sludge pump, and 25 is a sludge dewatering machine. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] like Figure 1 As shown, a nickel-containing electroplating wastewater treatment system includes a wastewater collection system, a pretreatment system, a separation system, a concentration system, a superconcentration system, and a sludge treatment system; the wastewater collection system includes a wastewater collection tank 1 and a collection tank booster pump 2; the pretreatment system includes a microfiltration concentration water tank 3, a microfiltration circulation pump 4, a microfiltration membrane device 5, a microfiltration water production tank 6, a microfiltration water production tank booster pump 7, and a carbon filter 8; the separation system security filter 9, a separation high-pressure pump 10, a separation device 11, a fresh water tank 12, and a fresh water reuse pump 13; the concentration system includes a concentration water tank 14, a concentration high-pressure pump 15, and a concentration device 16; the superconcentration system superconcentration water tank 17, a superconcentration high-pressure pump 18, a superconcentration device 19, a superconcentration water tank booster pump 20, a concentrate collection tank 21, and a concentrate reuse pump 22; the sludge treatment system sludge tank 23, a sludge pump 24, and a sludge dewatering machine 25.

[0028] The water outlet of the wastewater collection tank 1 is connected to the water inlet of the collection tank lifting pump 2; the water outlet of the collection tank lifting pump 2 is connected to the water inlet of the microfiltration concentration water tank 3; the water outlet of the microfiltration concentration water tank 3 is connected to the water inlet of the microfiltration circulation pump 4; the water outlet of the microfiltration circulation pump 4 is respectively connected to the water inlets of the microfiltration membrane device 5 and the sludge tank 23; the fresh water outlet of the microfiltration membrane device 5 is connected to the water inlet of the microfiltration water production tank 6, and the concentrated water outlet of the microfiltration membrane device 5 is connected to the water inlet of the microfiltration concentration water tank 3; the water outlet of the microfiltration water production tank 6 is connected to the water inlet of the microfiltration water production tank lifting pump 7 The water outlet of the microfiltration water production tank booster pump 7 is connected to the water inlet of the carbon filter 8; the water outlet of the carbon filter 8 is connected to the water inlet of the security filter 9; the water outlet of the security filter 9 is connected to the water inlet of the separation high-pressure pump 10; the water outlet of the separation high-pressure pump (10) is connected to the water inlet of the separation device (11); the fresh water outlet of the separation device 11 is connected to the water inlet of the fresh water tank 12, and the concentrated water outlet of the separation device 11 is connected to the water inlet of the concentrated water tank 14; the water outlet of the concentrated water tank 14 is connected to the water inlet of the concentrated high-pressure pump 15; The water outlet of the concentrating high-pressure pump 15 is connected to the water inlet of the concentrating device 16; the fresh water outlet of the concentrating device 16 is connected to the water inlet of the microfiltration water production tank 6, and the concentrated water outlet of the concentrating device 16 is connected to the water inlet of the super-concentrated water tank 17; the water outlet of the super-concentrated water tank 17 is respectively connected to the water inlets of the super-concentrated high-pressure pump 18 and the super-concentrated water tank booster pump 20; the water outlet of the super-concentrated high-pressure pump 18 is connected to the water inlet of the super-concentrating device 19; the fresh water outlet of the super-concentrating device 19 is connected to the water inlet of the concentrating water tank 14, and the concentrated water outlet of the super-concentrating device 19 is connected to the super-concentrated water tank 17. The water inlet of the water tank 17 is connected; the water outlet of the fresh water tank 12 is connected to the water inlet of the fresh water reuse pump 13; the water outlet of the fresh water reuse pump 13 is connected to the water washing tank of the production line; the water outlet of the super concentrated water tank booster pump 20 is connected to the water inlet of the concentrate collecting tank 21; the water outlet of the concentrate collecting tank 21 is connected to the water inlet of the concentrate reuse pump 22; the water outlet of the concentrate reuse pump 22 is connected to the electroplating mother tank of the production line; the water outlet of the sludge pool 23 is connected to the water inlet of the sludge pump 24; the water outlet of the sludge pump 24 is connected to the water inlet of the sludge dewatering machine 25.

[0029] A bottom valve is provided at the bottom of the water inlet pipeline of the collection tank lifting pump 2 to prevent water from flowing back in the water pump and reduce the inflow of debris, thereby reducing the risk of system blockage.

[0030] The pretreatment system uses a microfiltration membrane device 5 and a carbon filter 8 to filter the wastewater.

[0031] The wastewater in the microfiltration concentration water tank 3 is sent to the microfiltration membrane device 5 through the microfiltration circulation pump 4 for circulation filtration, and the final waste liquid in the microfiltration concentration water tank 3 is regularly discharged into the sludge pool 23 through the microfiltration circulation pump 4 for subsequent dehydration treatment.

[0032] The separation device 11 uses a brackish water desalination reverse osmosis membrane to separate the wastewater; the concentration device 16 and the superconcentration device 19 both use D series nanofiltration membranes to concentrate the wastewater.

[0033] The fresh water tank 12 is used to collect fresh water from the separation device 11, and the conductivity is below 200 us / cm, which can be reused in the water washing tank of the electroplating production line.

[0034] The wastewater in the super-concentrated water tank 17 is sent to the super-concentrated device 19 through the super-concentrated high-pressure pump 18 for circulating concentration treatment. The nickel concentration of the concentrate is not less than 40g / L. Finally, it is sent to the concentrate collection tank 21 through the super-concentrated water tank booster pump 20 for collection and reuse in the production line electroplating mother tank.

[0035] The fresh water recycling pump 13 and the concentrated liquid recycling pump 22 are both variable frequency constant pressure pumps; the fresh water recycling pump 13 is provided with a ball valve on its outlet pipe and near the water washing tank of the production line to control the recycled water entering the water washing tank; the concentrated liquid recycling pump 22 is provided with a ball valve on its outlet pipe and near the electroplating mother tank of the production line to control the tank liquid entering the electroplating mother tank.

[0036] The sewage generated by the sludge dewatering machine 25 flows back to the wastewater collection tank 1, and the generated sludge is entrusted to a professional organization for disposal as hazardous waste.

[0037] A liquid level control system is provided in the wastewater collection tank 1 to control the start and stop of the collection tank lifting pump 2; a liquid level control system is provided in the microfiltration concentration water tank 3 to control the start and stop of the microfiltration circulation pump 4; a liquid level control system is provided in the microfiltration production water tank 6 to control the start and stop of the microfiltration production water tank booster pump 7 and the separation high-pressure pump 10; a liquid level control system is provided in the fresh water tank 12 to control the start and stop of the separation high-pressure pump 10 and the fresh water reuse pump 13; a liquid level control system is provided in the concentrated water tank 14 to control the start and stop of the concentrated high-pressure pump 15; a liquid level gauge is provided in the super-concentrated water tank 17 to control the start and stop of the super-concentrated high-pressure pump 18 and the super-concentrated water tank booster pump 20; a liquid level control system is provided in the concentrated liquid collection tank 21 to control the start and stop of the super-concentrated water tank booster pump 20 and the concentrated liquid reuse pump 22; a liquid level control system is provided in the sludge tank 23 to control the start and stop of the sludge pump 24.

[0038] During use: nickel-containing electroplating wastewater enters the wastewater collection tank 1 through overflow, and is then sent to the microfiltration concentration water tank 3 through the collection tank lifting pump 2, and is sent to the microfiltration membrane device 5 by the microfiltration circulation pump 4 for circulation filtration to remove suspended solids. The waste liquid in the microfiltration concentration water tank 3 is regularly discharged into the sludge treatment system through the microfiltration circulation pump 4 for treatment. The water filtered by the microfiltration membrane device 5 enters the microfiltration water production tank 6, and then is sent to the carbon filter 8 through the microfiltration water production tank booster pump 7 to remove organic matter, and after passing through the security filter 9 to remove fine particles, it is sent to the separation device 11 through the separation high-pressure pump 10 for separation; the fresh water of the separation device 11 enters the fresh water tank 12 for storage, and can be reused in the electroplating production line water washing tank, the concentrated water produced by the separation device 11 enters the concentration water tank 14, and then is sent to the concentration device 16 through the concentration high-pressure pump 15 for primary concentration, the fresh water of the concentration device 16 returns to the front-end microfiltration water production tank 6, and the concentrated water enters the super-concentration water tank 17; and then is sent to the super-concentration device 19 through the super-concentration high-pressure pump 18 for secondary circulation concentration, the fresh water returns to the front-end concentration water tank 14, and the concentrated water is concentrated to a concentrated solution with a nickel concentration of not less than 40g / L, and is sent to the concentrated solution collection tank 21 through the super-concentration water tank booster pump 20, and the concentrated solution can be reused in the production line electroplating mother tank.

[0039] In summary, the utility model provides a nickel-containing electroplating wastewater treatment system, which uses a microfiltration membrane device and a carbon filter as a pretreatment system to filter the wastewater, which can intercept and separate the suspended solids and retain the nickel ions that need to be recovered; and can save the sedimentation tank and multi-media filtration, without the need to add flocculants, the overall sludge volume is generally less than the traditional process, the concentration is higher, and it can be directly sent to the sludge dewatering machine without further concentration; the carbon filter can effectively avoid organic matter from fouling the membrane. The separation device uses a brackish water desalination reverse osmosis membrane, and the conductivity of the generated fresh water reaches less than 200us / cm, which can be reused in the washing tank of the electroplating production line. The concentration device and the superconcentration device both use nanofiltration membranes to concentrate the wastewater, which can not only intercept divalent nickel ions, but also reduce the pressure requirements for high-pressure pumps and pipelines compared to seawater desalination membranes. The nickel concentration of the concentrate is not less than 40g / L, which can be reused in the electroplating mother tank of the production line. Both the fresh water reuse pump and the concentrate reuse pump use variable frequency constant pressure pumps. When reusing, only the corresponding ball valve needs to be opened for control, which not only protects the reuse water pump, but also has a high degree of automation of the system. The wastewater collection tank, microfiltration concentrated water tank, microfiltration water tank, concentrated water tank, super concentrated water tank, fresh water tank and concentrated liquid collection tank are all equipped with a liquid level control system to control the start and stop of the pump, which can realize the automated operation of the wastewater treatment system.

[0040] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the above embodiments do not limit the protection scope of the utility model in any form, and all technical solutions obtained by equivalent replacement and other methods fall within the protection scope of the utility model. The parts not involved in the utility model are the same as the existing technology or can be implemented by the existing technology.

Claims

1. A nickel-containing electroplating wastewater treatment system, characterized in that: The invention comprises a wastewater collection system, a pretreatment system, a separation system, a concentration system, a super-concentration system and a sludge treatment system; the wastewater collection system comprises a wastewater collection tank (1) and a collection tank booster pump (2); the pretreatment system comprises a microfiltration concentration water tank (3), a microfiltration circulation pump (4), a microfiltration membrane device (5), a microfiltration production water tank (6), a microfiltration production water tank booster pump (7) and a carbon filter (8); the separation system comprises a security filter (9), a separation high-pressure pump (10), a separation device (11), a fresh water tank (12) and a fresh water reuse pump (13); the concentration system comprises a concentration water tank (14), a concentration high-pressure pump (15) and a concentration device (16); the super-concentration system comprises a super-concentration water tank ( 17), a super-concentration high-pressure pump (18), a super-concentration device (19), a super-concentration water tank booster pump (20), a concentrate collection tank (21), and a concentrate recycling pump (22); the sludge treatment system comprises a sludge pool (23), a sludge pump (24), and a sludge dewatering machine (25); the water outlet of the wastewater collection pool (1) is connected to the water inlet of the collection pool booster pump (2); the water outlet of the collection pool booster pump (2) is connected to the water inlet of the microfiltration concentration water tank (3); the water outlet of the microfiltration concentration water tank (3) is connected to the water inlet of the microfiltration circulation pump (4); the water outlet of the microfiltration circulation pump (4) is connected to the microfiltration membrane device (5) and the water inlet of the sludge pool (23) respectively; the microfiltration membrane device (5 ) is connected to the water inlet of the microfiltration water production tank (6), and the concentrated water outlet of the microfiltration membrane device (5) is connected to the water inlet of the microfiltration concentrated water tank (3); the water outlet of the microfiltration water production tank (6) is connected to the water inlet of the microfiltration water production tank booster pump (7); the water outlet of the microfiltration water production tank booster pump (7) is connected to the water inlet of the carbon filter (8); the water outlet of the carbon filter (8) is connected to the water inlet of the security filter (9); the water outlet of the security filter (9) is connected to the water inlet of the separation high-pressure pump (10); the water outlet of the separation high-pressure pump (10) is connected to the water inlet of the separation device (11); the fresh water outlet of the separation device (11) is connected to the water inlet of the fresh water tank (12) The concentrated water outlet of the separation device (11) is connected to the water inlet of the concentrated water tank (14); the water outlet of the concentrated water tank (14) is connected to the water inlet of the concentrated high-pressure pump (15); the water outlet of the concentrated high-pressure pump (15) is connected to the water inlet of the concentrated device (16); the fresh water outlet of the concentrated device (16) is connected to the water inlet of the microfiltration water production tank (6), and the concentrated water outlet of the concentrated device (16) is connected to the water inlet of the super concentrated water tank (17); the water outlet of the super concentrated water tank (17) is respectively connected to the water inlets of the super concentrated high-pressure pump (18) and the super concentrated water tank booster pump (20); the water outlet of the super concentrated high-pressure pump (18) is connected to the water inlet of the super concentrated device (19);The fresh water outlet of the super-concentration device (19) is connected to the water inlet of the concentrated water tank (14), and the concentrated water outlet of the super-concentration device (19) is connected to the water inlet of the super-concentration water tank (17); the water outlet of the fresh water tank (12) is connected to the water inlet of the fresh water reuse pump (13); the water outlet of the fresh water reuse pump (13) is connected to the water washing tank of the production line; the water outlet of the super-concentration water tank booster pump (20) is connected to the water inlet of the concentrated liquid collection tank (21); the water outlet of the concentrated liquid collection tank (21) is connected to the water inlet of the concentrated liquid reuse pump (22); the water outlet of the concentrated liquid reuse pump (22) is connected to the electroplating mother tank of the production line; the water outlet of the sludge tank (23) is connected to the water inlet of the sludge pump (24); the water outlet of the sludge pump (24) is connected to the water inlet of the sludge dewatering machine (25).

2. A nickel-containing electroplating wastewater treatment system according to claim 1, characterized in that: A bottom valve is provided at the bottom of the water inlet pipeline of the collection tank lifting pump (2).

3. A nickel-containing electroplating wastewater treatment system according to claim 1, characterized in that: The pretreatment system uses a microfiltration membrane device (5) and a carbon filter (8) to filter the wastewater.

4. A nickel-containing electroplating wastewater treatment system according to claim 1, characterized in that: The wastewater in the microfiltration concentration water tank (3) is sent to the microfiltration membrane device (5) through the microfiltration circulation pump (4) for circulation filtration, and the final waste liquid in the microfiltration concentration water tank (3) is regularly discharged into the sludge pool (23) through the microfiltration circulation pump (4) for subsequent dehydration treatment.

5. The electroplating nickel-containing wastewater treatment system according to claim 1, characterized in that: The separation device (11) uses a brackish water desalination reverse osmosis membrane to separate the wastewater; the concentration device (16) and the superconcentration device (19) both use a D-series nanofiltration membrane to concentrate the wastewater.

6. A nickel-containing electroplating wastewater treatment system according to claim 1, characterized in that: The fresh water tank (12) is used to collect fresh water from the separation device (11), and has an electrical conductivity of less than 200 us / cm, and can be reused in the water washing tank of the electroplating production line.

7. The electroplating nickel-containing wastewater treatment system according to claim 1, characterized in that: The wastewater in the super-concentrated water tank (17) is sent to the super-concentrated device (19) through the super-concentrated high-pressure pump (18) for circulating concentration treatment, and the nickel concentration of the concentrate is not less than 40g / L. Finally, it is sent to the concentrate collection tank (21) through the super-concentrated water tank booster pump (20) for collection and reuse in the production line electroplating mother tank.

8. The electroplating nickel-containing wastewater treatment system according to claim 1, characterized in that: The fresh water recycling pump (13) and the concentrated liquid recycling pump (22) are both variable frequency constant pressure pumps; a ball valve is provided on the outlet pipe of the fresh water recycling pump (13) and near the water washing tank of the production line to control the recycled water to enter the water washing tank; a ball valve is provided on the outlet pipe of the concentrated liquid recycling pump (22) and near the electroplating mother tank of the production line to control the tank liquid to enter the electroplating mother tank.

9. The electroplating nickel-containing wastewater treatment system according to claim 1, characterized in that: The wastewater generated by the sludge dewatering machine (25) flows back to the wastewater collection tank (1), and the generated sludge is entrusted to a professional organization for disposal as hazardous waste.

10. The electroplating nickel-containing wastewater treatment system according to claim 1, characterized in that: The wastewater collection tank (1) is provided with a liquid level control system to control the start and stop of the collection tank booster pump (2); the microfiltration concentration water tank (3) is provided with a liquid level control system to control the start and stop of the microfiltration circulation pump (4); the microfiltration production water tank (6) is provided with a liquid level control system to control the start and stop of the microfiltration production water tank booster pump (7) and the separation high-pressure pump (10); the fresh water tank (12) is provided with a liquid level control system to control the start and stop of the separation high-pressure pump (10) and the fresh water reuse pump (13); A liquid level control system is provided in the concentrated water tank (14) to control the start and stop of the concentrated high-pressure pump (15); a liquid level gauge is provided in the super-concentrated water tank (17) to control the start and stop of the super-concentrated high-pressure pump (18) and the super-concentrated water tank booster pump (20); a liquid level control system is provided in the concentrated liquid collection tank (21) to control the start and stop of the super-concentrated water tank booster pump (20) and the concentrated liquid recycling pump (22); and a liquid level control system is provided in the sludge tank (23) to control the start and stop of the sludge pump (24).

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