A system and process for the resource-based treatment of electroplating wastewater

Abstract

This invention discloses a resource-based treatment system and process for electroplating wastewater, belonging to the field of electroplating wastewater treatment. The system comprises a resin adsorption device whose eluent outlet is connected to a membrane concentration device; the concentrated liquid outlet of the membrane concentration device is connected to an electrolytic cell; the dialysis liquid outlet of the resin adsorption device, the permeate outlet of the membrane concentration device, and the residual liquid outlet of the electrolytic cell are all connected to a mixing tank; the outlet of the mixing tank is connected to a submerged ultrafiltration membrane tank; the filtrate outlet of the submerged ultrafiltration membrane tank is connected to an electrodialysis device; the desalination liquid outlet of the electrodialysis device is connected to a reverse osmosis device; the concentrated liquid outlet of the electrodialysis device is connected to a bipolar membrane electrodialysis device; and the alkali liquid outlet of the bipolar membrane electrodialysis device is connected to the submerged ultrafiltration membrane tank. This invention achieves resource-based treatment, yielding not only valuable metals but also acid and alkali solutions, while ensuring that the treated water meets discharge standards. Through the treatment of the liquids in each step, zero-pollution discharge is achieved.

Description

Technical Field

[0001] This invention belongs to the field of electroplating wastewater treatment, and particularly relates to an electroplating wastewater resource utilization treatment system and process. Background Technology

[0002] With the rapid development of modern industry, the wastewater problem generated during the electroplating industry, as an important part of the manufacturing industry, has become increasingly prominent. Electroplating wastewater is a complex industrial wastewater containing heavy metal ions and other harmful substances. If not treated properly, it will not only cause serious pollution to the natural environment, but also accumulate through the food chain and ultimately threaten human health.

[0003] An integrated electroplating wastewater treatment device, application number CN202411025804.7, includes a main control box, a pretreatment cylinder, a centrifugal outer cylinder, and a recovery cylinder. The pretreatment cylinder, centrifugal outer cylinder, and recovery cylinder are all located at the top of the main control box. The pretreatment cylinder contains a pretreatment mechanism with a filtration and slag removal system. The centrifugal outer cylinder contains a deep purification mechanism with a microprocessor system. The recovery cylinder contains an electrolytic recovery mechanism with a ventilation system. While it recovers heavy metal ions through electrolysis, it does not provide subsequent treatment for the electrolytic residue and other treated liquids, resulting in insufficient resource utilization of the electroplating wastewater. Summary of the Invention

[0004] The purpose of this invention is to provide a system and process for the resource-based treatment of electroplating wastewater, so as to overcome at least one of the above-mentioned defects in the prior art.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] This invention provides a resource-based treatment system for electroplating wastewater, comprising a resin adsorption device, a membrane concentration device, an electrolytic cell, a mixing tank, a submerged ultrafiltration membrane tank, an electrodialysis device, a reverse osmosis device, and a bipolar membrane electrodialysis device. The eluent outlet of the resin adsorption device is connected to the membrane concentration device, the concentrate outlet of the membrane concentration device is connected to the electrolytic cell, the dialysis outlet of the resin adsorption device, the permeate outlet of the membrane concentration device, and the residual liquid outlet of the electrolytic cell are all connected to the mixing tank, the outlet of the mixing tank is connected to the submerged ultrafiltration membrane tank, the filtrate outlet of the submerged ultrafiltration membrane tank is connected to the electrodialysis device, the desalination outlet of the electrodialysis device is connected to the reverse osmosis device, the concentrate outlet of the electrodialysis device is connected to the bipolar membrane electrodialysis device, and the alkali outlet of the bipolar membrane electrodialysis device is connected to the submerged ultrafiltration membrane tank.

[0007] Preferably, the mixing tank includes a tank body, a liquid collection assembly, a rotating platform, a gear ring, a first gear, a second gear, a first stirring assembly, a second stirring assembly, an atomizing nozzle, a mounting base, a sealing ring, a first inlet pipe, and a second inlet pipe. The rotating platform and mounting base are fixed to the inner top wall of the tank body. A gear ring is fixed to the rotating end of the rotating platform. A first stirring assembly and two second stirring assemblies are fixed to the top of the tank body. The rotating ends of the two second stirring assemblies are located on the left and right sides of the rotating end of the first stirring assembly, respectively. A first gear is fixed to the rotating end of the first stirring assembly, and a second gear is fixed to the rotating end of the second stirring assembly. The first gear meshes with the second gear, and the second gear meshes with the gear ring. The gear ring has a first annular groove inside. A plurality of atomizing nozzles are distributed circumferentially at intervals along the bottom of the gear ring. The atomizing nozzles mesh with the first gear... A ring groove is connected, and a mounting base is sleeved outside the toothed ring. The mounting base has a second ring groove, which is connected to the first ring groove. A sealing ring is provided between the toothed ring on the upper and lower sides of the first ring groove and the mounting base. The first liquid inlet pipe is fixed to the side wall of the mounting base, and its top end extends through the top wall of the tank to the outside of the tank. The first liquid inlet pipe is connected to the second ring groove. The side wall of the tank has two arc-shaped cavities arranged opposite each other. The inner side wall of the tank has several spray holes that communicate with the arc-shaped cavities. The left and right outer side walls of the tank are fixed with second liquid inlet pipes, which are connected to the arc-shaped cavities. The liquid inlet end of the liquid collection component is connected to the dialysis liquid outlet of the resin adsorption device, the permeate outlet of the membrane concentration device, and the residual liquid outlet of the electrolytic cell, respectively. The liquid outlet end of the liquid collection component is connected to the first liquid inlet pipe and the second liquid inlet pipe, respectively.

[0008] Preferably, the liquid collection assembly includes a liquid collection tank, partitions, pipes, valves, and a pressurizing pump. The liquid collection tank has two partitions fixed inside, which divide the internal space of the liquid collection tank into three liquid collection chambers. The tops of the three liquid collection chambers are respectively connected to the dialysate outlet of the resin adsorption device, the permeate outlet of the membrane concentration device, and the residual liquid outlet of the electrolytic cell. The bottom of each liquid collection chamber is fixedly connected to a pipe. The pipes are equipped with valves and a pressurizing pump in sequence along the liquid flow direction. The three liquid collection chambers are respectively connected to the first inlet pipe and the second inlet pipe through the pipes.

[0009] Preferably, the plurality of nozzles includes a plurality of nozzle groups spaced apart along the arc direction of the arc-shaped cavity, each nozzle group including a plurality of nozzles spaced apart along the height direction of the tank, and the nozzles are inclined upward.

[0010] Preferably, the first stirring assembly includes a frame, a motor, a stirring shaft, a first bearing seat, a first stirring blade, and a second stirring blade. The frame and the first bearing seat are fixed to the top of the tank. The motor is fixed to the frame. The stirring shaft is fixed to the bottom of the motor. The lower part of the stirring shaft passes through the first bearing seat and the top wall of the tank and extends into the interior of the tank where the first stirring blade and the second stirring blade are fixed. The first stirring blade is located below the second stirring blade. A first gear is fixed to the stirring shaft.

[0011] Preferably, the second stirring assembly includes a second bearing seat, a hollow rotating shaft, and a stirring plate. The second bearing seat is fixed to the top of the tank, and the bottom end of the hollow rotating shaft passes through the second bearing seat and the top wall of the tank, and extends into the interior of the tank where the stirring plate is fixed. The stirring plate is located between the first stirring blade and the second stirring blade.

[0012] Preferably, the mixing tank also includes an air supply component and a cam. The air supply component is fixed to the frame, and the cam is fixed to the stirring shaft. The cam pushes the air supply component to supply air. The air outlet of the air supply component extends into the hollow rotating shaft. The stirring plate has a cavity. The upper and lower side walls of the stirring plate have several air holes. The air holes are connected to the cavity, and the cavity is connected to the hollow rotating shaft.

[0013] Preferably, all the pores are arranged at an angle.

[0014] Preferably, the air supply assembly includes a push plate, a push rod, a piston, a cylinder, a connecting rod, an air inlet pipe, an air outlet pipe, a first one-way valve, and a second one-way valve. Cylinders are fixed on both the left and right sides of the frame. A piston is slidably connected inside the cylinder. A push rod is fixed to the inner end of the piston. A push plate is fixed to the inner end of the push rod. The push plates on the left and right sides are connected by a connecting rod. The push plates on the left and right sides are located on the left and right sides of the cam and are in contact with the cam. An air inlet pipe is fixedly connected to the top wall of the cylinder. The air inlet pipe is equipped with a first one-way valve. An air outlet pipe is fixedly connected to the top wall of the cylinder. The air outlet pipe is equipped with a second one-way valve. The bottom end of the air outlet pipe extends into the hollow rotating shaft.

[0015] This invention also provides a process for the resource-based treatment of electroplating wastewater, using the aforementioned electroplating wastewater resource-based treatment system, comprising the following steps: sending the electroplating wastewater into a resin adsorption device for resin adsorption treatment; sending the eluent obtained from the treatment into a membrane concentration device for membrane concentration treatment; sending the concentrated solution obtained from the treatment into an electrolytic cell for electrolytic treatment to obtain valuable metals; sending the dialysis solution obtained from the resin adsorption treatment, the permeate obtained from the membrane concentration treatment, and the residual liquid obtained from the electrolytic treatment into a mixing tank for mixing treatment; sending the mixed solution after mixing treatment into a submerged ultrafiltration membrane tank for ultrafiltration treatment; sending the filtrate obtained from the ultrafiltration treatment into an electrodialysis device for electrodialysis treatment; sending the desalinated solution obtained from the treatment into a reverse osmosis device for reverse osmosis treatment to obtain permeate; sending the concentrated solution obtained from the treatment into a bipolar membrane electrodialysis device for electrodialysis treatment again to obtain acid solution and alkali solution; and recycling the alkali solution back to the submerged ultrafiltration membrane tank.

[0016] The beneficial effects of this invention are as follows:

[0017] 1. By carrying out resource-based treatment, not only valuable metals are obtained, but also acid and alkali solutions are produced, and the wastewater is discharged in compliance with standards; by treating the liquids in each step, zero pollution discharge is achieved.

[0018] 2. The dialysis solution obtained from resin adsorption treatment, the permeate obtained from membrane concentration treatment, and the residual liquid obtained from electrolysis treatment are mixed in a mixing tank and then sent to the submerged ultrafiltration membrane tank. This makes the water quality of the mixed solution more uniform and stable, providing more favorable water quality conditions for subsequent treatment steps.

[0019] 3. The dialysis solution obtained from resin adsorption treatment and the residual liquid obtained from electrolysis treatment are sprayed out from left and right and collided and dispersed inside the tank to initially mix the two. The solution is then sprayed out in an atomized manner and mixed with the dialysis solution obtained from resin adsorption treatment and the residual liquid obtained from electrolysis treatment that collide from left and right, to achieve initial mixing of the three. Finally, the solution falls to the bottom of the tank and is subjected to double stirring treatment by the first stirring component and the second stirring component, so that the mixing is more thorough, uniform and efficient.

[0020] 4. The mounting base and the gear ring work together to ensure stable liquid intake during rotation.

[0021] 5. When the first mixing component is performing mixing operations, it drives the first gear to rotate, causing the second gears on both sides to rotate in the opposite direction, which in turn drives the second mixing component to rotate. At the same time, it drives the gear ring to rotate, realizing a rotating spray with a wider and more comprehensive spray range and better mixing effect.

[0022] 6. Only one drive source is needed for the first mixing component to achieve reverse mixing with the second mixing component and rotary spray treatment, which is a clever design.

[0023] 7. By setting up three pipelines and valves, the transport of the dialysis liquid obtained from resin adsorption treatment, the permeate obtained from membrane concentration treatment, and the residual liquid obtained from electrolysis treatment are controlled respectively to meet different operational needs; the liquid is pressurized by a pressure pump, which is beneficial to the subsequent liquid ejection collision and dispersion.

[0024] 8. The nozzle is tilted upwards, allowing the droplets to cover a higher area, increasing the vertical coverage of the droplets, and making the sprayed droplets more uniform and fine, thus improving the collision and mixing effect.

[0025] 9. The stirring plate rotates in the opposite direction to the first and second stirring blades, and is located between the first and second stirring blades. The shear force generated helps to break up clumps and bubbles in the mixture, making it more uniform. It can further push and mix the liquid, ensuring more thorough mixing. This stirring method can also reduce dead zones in the mixing process, ensuring that all liquids are fully mixed. The counter-rotation of the stirring plate and the first and second stirring blades helps to form convection, that is, the liquid forms an up-down and left-right circulation flow in the tank. This convection can further promote the mixing of the liquid, improve the mixing effect, greatly reduce the mixing time, and reduce energy consumption.

[0026] 10. While stirring, airflow is used to propel the mixture, causing it to mix more thoroughly, thereby improving mixing efficiency. The synergistic effect of airflow and stirring can improve the stirring effect, making the mixture more uniform and delicate.

[0027] 11. The air supply component does not require an additional drive source. It is directly driven by the stirring shaft in conjunction with the cam to achieve air supply. The design is ingenious and saves energy.

[0028] 12. The use of inclined vents allows the gas to form a more complex and intense flow pattern in the liquid. When the gas is ejected at an inclined angle, it will push the liquid to move along the inclined direction, and at the same time generate certain radial and tangential components, which will help the liquid mix and distribute evenly.

[0029] 13. The air supply component is set up with one supply and one standby, which, combined with the continuously rotating stirring plate, the first stirring blade and the second stirring blade, greatly improves the mixing effect. Attached Figure Description

[0030] Figure 1 This is a system block diagram of the present invention.

[0031] Figure 2 This is a schematic diagram of the main structure of the mixing tank of the present invention.

[0032] Figure 3 This is a cross-sectional structural diagram of the tank body of the present invention.

[0033] Figure 4 yes Figure 3 A magnified structural diagram of A in the middle.

[0034] Figure 5 This is a schematic diagram of the mating structure of the first gear, the second gear, the gear ring, the mounting base, and the rotary table of the present invention.

[0035] Figure 6 This is a schematic diagram of the main structure of the first stirring component of the present invention.

[0036] Figure 7 This is a schematic diagram of the cooperative structure of the motor, cam, stirring shaft and air supply component of the present invention.

[0037] Figure 8 This is a cross-sectional structural schematic diagram of the stirring plate and hollow rotating shaft of the present invention.

[0038] The labels in the attached diagram are as follows: 100-resin adsorption device, 200-membrane concentration device, 300-electrolytic cell, 400-mixing tank, 500-submerged ultrafiltration membrane tank, 600-electrodialysis equipment, 700-reverse osmosis equipment, 800-bipolar membrane electrodialysis equipment, 1-tank body, 2-rotating table, 3-gear ring, 4-liquid collection assembly, 5-first gear, 6-second gear, 7-first stirring assembly, 8-second stirring assembly, 9-atomizing nozzle, 10-mounting base, 11-sealing ring, 12-first inlet pipe, 13-second inlet pipe, 14-first annular groove, 15-second annular groove, 16-arc-shaped cavity. 17-Spray hole, 41-Collection tank, 42-Baffle plate, 43-Pipe, 44-Valve, 45-Pressure pump, 46-Collection chamber, 71-Frame, 72-Motor, 73-Agitator shaft, 74-First bearing seat, 75-First agitator blade, 76-Second agitator blade, 81-Second bearing seat, 82-Hollow rotating shaft, 83-Agitator plate, 18-Air supply assembly, 831-Cavity, 832-Air hole, 181-Push plate, 182-Push rod, 183-Piston, 184-Cylinder body, 185-Connecting rod, 186-Inlet pipe, 187-Outlet pipe, 188-First check valve, 189-Second check valve. Detailed Implementation

[0039] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0040] Contents not described in detail in this specification are prior art known to those skilled in the art. In the description of this invention, it should be understood that terms such as "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, terms such as "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0041] like Figures 1 to 8As shown, this embodiment provides a resource-based treatment system for electroplating wastewater, including a resin adsorption device 100, a membrane concentration device 200, an electrolytic cell 300, a mixing tank 400, a submerged ultrafiltration membrane tank 500, an electrodialysis device 600, a reverse osmosis device 700, and a bipolar membrane electrodialysis device 800. The eluent outlet of the resin adsorption device 100 is connected to the membrane concentration device 200, and the concentrate outlet of the membrane concentration device 200 is connected to the electrolytic cell 300. The dialysis outlet of the resin adsorption device 100 and the membrane concentration outlet are connected to the electrolytic cell 300. The permeate outlet of the condenser 200 and the residual liquid outlet of the electrolysis cell 300 are both connected to the mixing tank 400. The outlet of the mixing tank 400 is connected to the submerged ultrafiltration membrane tank 500. The filtrate outlet of the submerged ultrafiltration membrane tank 500 is connected to the electrodialysis equipment 600. The desalination liquid outlet of the electrodialysis equipment 600 is connected to the reverse osmosis equipment 700. The concentrate outlet of the electrodialysis equipment 600 is connected to the bipolar membrane electrodialysis equipment 800. The alkali outlet of the bipolar membrane electrodialysis equipment 800 is connected to the submerged ultrafiltration membrane tank 500.

[0042] This embodiment also provides a process for the resource recovery treatment of electroplating wastewater, which uses the above-mentioned electroplating wastewater resource recovery treatment system and includes the following steps:

[0043] Electroplating wastewater is fed into a resin adsorption unit 100 for resin adsorption treatment. The resulting eluent is then fed into a membrane concentration unit 200 for membrane concentration treatment. The concentrated solution is then fed into an electrolytic cell 300 for electrolysis treatment to obtain valuable metals. The dialysis solution obtained from resin adsorption treatment, the permeate obtained from membrane concentration treatment, and the residual liquid from electrolysis treatment are fed into a mixing tank 400 for mixing treatment. The mixed solution is then fed into a submerged ultrafiltration membrane tank 500 for ultrafiltration treatment. The filtrate obtained from ultrafiltration treatment is then fed into an electrodialysis unit 600 for electrodialysis treatment. The resulting desalinated solution is then fed into a reverse osmosis unit 700 for reverse osmosis treatment to obtain permeate. The concentrated solution obtained from reverse osmosis treatment is then fed into a bipolar membrane electrodialysis unit 800 for further electrodialysis treatment to obtain acid and alkali solutions. The alkali solution is recycled back to the submerged ultrafiltration membrane tank 500. This resource-based treatment not only yields valuable metals but also provides acid and alkali solutions, while ensuring that the permeate meets discharge standards. By treating the liquids in each step, zero-pollution discharge is achieved. The dialysis solution obtained from resin adsorption treatment, the permeate obtained from membrane concentration treatment, and the residual liquid obtained from electrolysis treatment are mixed in a mixing tank 400 and then sent to a submerged ultrafiltration membrane tank 500. This makes the water quality of the mixed solution more uniform and stable, providing more favorable water quality conditions for subsequent treatment steps.

[0044] The mixing tank 400 includes a tank body 1, a liquid collection assembly 4, a rotating platform 2, a gear ring 3, a first gear 5, a second gear 6, a first stirring assembly 7, a second stirring assembly 8, an atomizing nozzle 9, a mounting base 10, a sealing ring 11, a first liquid inlet pipe 12, and a second liquid inlet pipe 13. The rotating platform 2 and the mounting base 10 are fixed to the inner top wall of the tank body 1. The gear ring 3 is fixed to the rotating end of the rotating platform 2. The first stirring assembly 7 and two second stirring assemblies 8 are fixed to the top of the tank body 1. The rotating ends of the two second stirring assemblies 8 are located on the left and right sides of the rotating end of the first stirring assembly 7, respectively. The first gear 5 is fixed to the rotating end of the first stirring assembly 7, and the second gear 6 is fixed to the rotating end of the second stirring assembly 8. The first gear 5 meshes with the second gear 6, and the second gear 6 meshes with the gear ring 3. The gear ring 3 has a first annular groove 14 inside. Several atomizing nozzles 9 are distributed circumferentially at intervals along the bottom of the gear ring 3, and the atomizing nozzles 9 communicate with the first annular groove 14. The mounting base 10 is fitted over the toothed ring 3. The mounting base 10 has a second annular groove 15, which communicates with the first annular groove 14. Sealing rings 11 are provided between the toothed ring 3 on the upper and lower sides of the first annular groove 14 and the mounting base 10. The first inlet pipe 12 is fixed to the side wall of the mounting base 10, and its top end extends through the top wall of the tank body 1 to the outside of the tank body 1. The first inlet pipe 12 communicates with the second annular groove 15. The side wall of the tank body 1 has two arcs arranged opposite each other. The inner wall of the tank body 1 has several spray holes 17 communicating with the arc-shaped cavity 16. Second inlet pipes 13 are fixed to the left and right outer walls of the tank body 1, and these second inlet pipes 13 communicate with the arc-shaped cavity 16. The inlet end of the liquid collection assembly 4 is connected to the dialysate outlet of the resin adsorption device 100, the permeate outlet of the membrane concentration device 200, and the residual liquid outlet of the electrolytic cell 300, respectively. The outlet end of the liquid collection assembly 4 is connected to the first inlet pipe 12 and the second inlet pipe 13, respectively. The liquid collection assembly 4 collects the dialysate obtained from resin adsorption treatment, the permeate obtained from membrane concentration treatment, and the residual liquid obtained from electrolysis treatment, and transports them to various locations within the tank body 1. Specifically, the dialysate obtained from resin adsorption treatment enters the arc-shaped cavity located on the left side and is sprayed out through the spray holes 17; the residual liquid obtained from electrolysis treatment enters the arc-shaped cavity located on the right side and is sprayed out through the spray holes 17. The dialysis solution obtained from resin adsorption treatment and the residual liquid obtained from electrolysis treatment are initially mixed by collision and dispersion inside the tank 1 in the form of left and right sprays. Meanwhile, the permeate obtained from membrane concentration treatment enters the second annular groove 15 through the first inlet pipe 12, flows to the atomizing nozzle 9 through the first annular groove 14, and is atomized and sprayed downwards. This atomized spray mixes with the dialysis solution obtained from resin adsorption treatment and the residual liquid obtained from electrolysis treatment, resulting in initial mixing. Finally, the mixture falls to the bottom of the tank 1, where it is double-stirred by the first stirring component 7 and the second stirring component 8, making the mixing more thorough, uniform, and efficient. The cooperation between the mounting base 10 and the toothed ring 3 ensures stable liquid intake even during the rotation of the toothed ring 3.When the first stirring component 7 is performing stirring, it drives the first gear 5 to rotate, causing the second gears 6 on both sides to rotate in the opposite direction, which in turn drives the second stirring component 8 to rotate. At the same time, it drives the gear ring 3 to rotate, realizing a rotary spray with a wider and more comprehensive spray range and better mixing effect. Only one drive source is needed for the first stirring component 7 to achieve both reverse stirring and rotary spray treatment with the second stirring component 8, which is a clever design.

[0045] The liquid collection assembly 4 includes a collection tank 41, partitions 42, pipes 43, valves 44, and a pressure pump 45. Two partitions 42 are fixed inside the collection tank 41, dividing the internal space into three collection chambers 46. The tops of the three collection chambers 46 are respectively connected to the dialysate outlet of the resin adsorption device 100, the permeate outlet of the membrane concentration device 200, and the residual liquid outlet of the electrolytic cell 300. Each collection chamber 46 has a fixed pipe 43 at its bottom. A valve 44 and a pressure pump 45 are sequentially installed along the liquid flow direction on the pipes 43. The three collection chambers 46 are connected to the first inlet pipe 12 and the second inlet pipe 13 via the pipes 43. Integrating the three collection chambers 46 into a single collection tank 41 reduces space requirements. The three pipes 43 and valves 44 control the transport of the dialysate obtained from resin adsorption, the permeate obtained from membrane concentration, and the residual liquid obtained from electrolysis, adapting to different operational needs. Pressurizing the liquid with a pressure pump 45 facilitates subsequent liquid ejection, collision, and dispersion.

[0046] The nozzles 17 include several groups of nozzles 17 spaced apart along the arc of the arc-shaped cavity 16. Each group of nozzles 17 includes several nozzles 17 spaced apart along the height of the tank body 1, and the nozzles 17 are inclined upwards. The spacing of the nozzles 17 along the arc of the arc of the arc-shaped cavity 16 ensures that the sprayed droplets are evenly distributed within the arc of the arc-shaped cavity 16. The upward inclination of the nozzles 17 allows the droplets to cover a higher area, increasing the vertical coverage of the droplets and making the sprayed droplets more uniform and fine, thus improving the collision and mixing effect.

[0047] The first stirring assembly 7 includes a frame 71, a motor 72, a stirring shaft 73, a first bearing seat 74, a first stirring blade 75, and a second stirring blade 76. The frame 71 and the first bearing seat 74 are fixed to the top of the tank 1. The motor 72 is fixed to the frame 71, and the stirring shaft 73 is fixed to the bottom of the motor 72. The lower part of the stirring shaft 73 passes through the first bearing seat 74 and the top wall of the tank 1, and extends into the interior of the tank 1 where the first stirring blade 75 and the second stirring blade 76 are fixed. The first stirring blade 75 is located below the second stirring blade 76, and a first gear 5 is fixed to the stirring shaft 73. When the motor 72 rotates, it drives the stirring shaft 73 to rotate, causing the first stirring blade 75 and the second stirring blade 76 to rotate, thus stirring and mixing the falling mixture.

[0048] The second stirring assembly 8 includes a second bearing seat 81, a hollow rotating shaft 82, and a stirring plate 83. The second bearing seat 81 is fixed to the top of the tank 1. The bottom end of the hollow rotating shaft 82 passes through the second bearing seat 81 and the top wall of the tank 1, and extends into the interior of the tank 1 where the stirring plate 83 is fixed. The stirring plate 83 is located between the first stirring blade 75 and the second stirring blade 76. When the stirring shaft 73 rotates, it drives the first gear 5 to rotate, causing the second gear 6 to rotate in the opposite direction, which in turn drives the hollow rotating shaft 82 to rotate in the opposite direction, causing the stirring plate 83 to rotate in the opposite direction. The rotation direction of the stirring plate 83 is opposite to that of the first stirring blade 75 and the second stirring blade 76, and the stirring plate 83 is located between the first stirring blade 75 and the second stirring blade 76. The shear force generated by the stirring plate 83 helps to break up clumps and bubbles in the mixture, making it more uniform. It can further push and mix the liquid, ensuring more thorough mixing. This stirring method can also reduce dead zones during the stirring process, ensuring that all liquids are fully mixed. The counter-rotation of the stirring plate 83 with the first stirring blade 75 and the second stirring blade 76 helps to form convection, that is, the liquid forms an up-down and left-right circulating flow in the tank 1. This convection can further promote the mixing of the liquid, improve the mixing effect, greatly reduce the mixing time, and reduce energy consumption.

[0049] The mixing tank 400 also includes an air supply component 18 and a cam. The air supply component 18 is fixed to the frame 71, and the cam is fixed to the stirring shaft 73. The cam pushes the air supply component 18 to supply air. The air outlet of the air supply component 18 extends into the hollow rotating shaft 82. The stirring plate 83 has a cavity 831, and both the upper and lower side walls of the stirring plate 83 have several air holes 832. The air holes 832 communicate with the cavity 831, and the cavity 831 communicates with the hollow rotating shaft 82. The stirring shaft 73 drives the cam to rotate, causing the air supply component 18 to blow air. The airflow enters the cavity 831 of the stirring plate 83 through the hollow rotating shaft 82 and finally exits through the air holes 832. While performing the stirring operation, the airflow pushes the mixture, causing the mixture to be mixed more thoroughly, thereby improving the mixing efficiency. The synergistic effect of air supply and stirring can improve the stirring effect, making the mixture more uniform and delicate. Furthermore, the air supply component 18 does not require an additional drive source; it is directly driven by the stirring shaft 73 in conjunction with the cam to achieve air supply. This ingenious design saves energy.

[0050] Several of the vents 832 are inclined. The inclined vents 832 allow for more complex and intense gas flow patterns within the liquid. When gas is ejected at an inclined angle, it propels the liquid along the inclined direction, while also generating radial and tangential components, which contribute to the mixing and uniform distribution of the liquid.

[0051] The air supply assembly 18 includes a push plate 181, a push rod 182, a piston 183, a cylinder 184, a connecting rod 185, an air inlet pipe 186, an air outlet pipe 187, a first one-way valve 188, and a second one-way valve 189. Cylinders 184 are fixed to both the left and right sides of the frame 71. A piston 183 is slidably connected inside the cylinder 184. A push rod 182 is fixed to the inner end of the piston 183, and a push plate 181 is fixed to the inner end of the push rod 182. The push plates 181 on the left and right sides are connected by connecting rods 185. The push plates 181 on the left and right sides of the cam are respectively located on the left and right sides and in contact with the cam. The top wall of the cylinder 184 is fixedly connected to an air inlet pipe 186, which is equipped with a first one-way valve 188. The top wall of the cylinder 184 is fixedly connected to an air outlet pipe 187, which is equipped with a second one-way valve 189. The bottom end of the air outlet pipe 187 extends into the hollow rotating shaft 82. As the cam rotates with the stirring shaft 73, it repeatedly pushes the push plates 181 to move left and right, which drives the push rod 182 to move left and right, causing the piston 183 to move left and right, continuously pumping air into the tank 1. When the cylinder 184 on the right side pumps air, the cylinder 184 on the left side pumps air, and when the cylinder 184 on the right side pumps air, the cylinder 184 on the left side pumps air. This one-supply-one-wait setup, combined with the continuously rotating stirring plate 83, the first stirring blade 75, and the second stirring blade 76, greatly improves the mixing effect. The first one-way valve 188 ensures that gas only enters the cylinder 184 through the intake pipe 186, preventing gas from escaping through the intake pipe 186. The second one-way valve 189 ensures that gas from the cylinder 184 only exits through the exhaust pipe 187, preventing gas from entering the cylinder 184 through the exhaust pipe 187.

[0052] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A system for the resource-based treatment of electroplating wastewater, characterized in that: This includes resin adsorption devices, membrane concentration devices, electrolytic cells, mixing tanks, submerged ultrafiltration membrane tanks, electrodialysis equipment, reverse osmosis equipment, and bipolar membrane electrodialysis equipment; The eluent outlet of the resin adsorption device is connected to the membrane concentration device. The concentrated liquid outlet of the membrane concentration device is connected to the electrolytic cell; The dialysis liquid outlet of the resin adsorption device, the permeate outlet of the membrane concentration device, and the residual liquid outlet of the electrolytic cell are all connected to the mixing tank. The outlet of the mixing tank is connected to the submerged ultrafiltration membrane tank, the filtrate outlet of the submerged ultrafiltration membrane tank is connected to the electrodialysis equipment, the desalination outlet of the electrodialysis equipment is connected to the reverse osmosis equipment, and the concentrate outlet of the electrodialysis equipment is connected to the bipolar membrane electrodialysis equipment. The alkaline solution outlet of the bipolar membrane electrodialysis equipment is connected to the submerged ultrafiltration membrane tank. The mixing tank includes a tank body, a liquid collection assembly, a rotary table, a gear ring, a first gear, a second gear, a first stirring assembly, a second stirring assembly, an atomizing nozzle, a mounting base, a sealing ring, a first liquid inlet pipe, and a second liquid inlet pipe; A rotating platform and a mounting base are fixed to the inner top wall of the tank. A gear ring is fixed to the rotating end of the rotary table; The top of the tank is fixed with a first stirring assembly and two second stirring assemblies, and the rotating ends of the two second stirring assemblies are located on the left and right sides of the rotating end of the first stirring assembly, respectively. The first gear is fixed to the rotating end of the first stirring assembly, the second gear is fixed to the rotating end of the second stirring assembly, the first gear meshes with the second gear, and the second gear meshes with the gear ring; The toothed ring has a first annular groove inside, and a plurality of atomizing nozzles are distributed at intervals along the circumference of the bottom of the toothed ring, and the atomizing nozzles are connected to the first annular groove. The mounting base is sleeved outside the gear ring, and the mounting base has a second annular groove, which communicates with the first annular groove. A sealing ring is provided between the toothed rings on the upper and lower sides of the first annular groove and the mounting base; The first inlet pipe is fixed to the side wall of the mounting base, and its top end extends through the top wall of the tank body to the outside of the tank body. The first inlet pipe is connected to the second annular groove. The tank body has two arc-shaped cavities arranged opposite each other on the side wall. The inner side wall of the tank body has several spray holes that communicate with the arc-shaped cavities. The left and right outer side walls of the tank body are each fixed with a second liquid inlet pipe, which communicates with the arc-shaped cavities. The liquid collection component is connected to the dialysis liquid outlet of the resin adsorption device, the permeate outlet of the membrane concentration device, and the residual liquid outlet of the electrolytic cell, respectively. The liquid collection assembly's outlet end is connected to the first liquid inlet pipe and the second liquid inlet pipe, respectively. The liquid collection assembly includes a liquid collection tank, a partition, pipes, valves, and a pressure pump; The liquid collection tank has two fixed partitions inside, which divide the internal space of the liquid collection tank into three liquid collection chambers. The tops of the three liquid collection chambers are respectively connected to the dialysis liquid outlet of the resin adsorption device, the permeate outlet of the membrane concentration device, and the residual liquid outlet of the electrolytic cell. Each of the liquid collection chambers is fixedly connected to a pipe at its bottom end, and the pipe is provided with a valve and a pressure pump in sequence along the liquid flow direction; The three liquid collection chambers are respectively connected to the first liquid inlet pipe and the second liquid inlet pipe via pipes; The plurality of nozzles include a plurality of groups of nozzles spaced apart along the arc direction of the arc-shaped cavity; Each group of nozzles includes several nozzles spaced apart along the height of the tank.

2. The electroplating wastewater resource utilization treatment system according to claim 1, characterized in that: The nozzle is angled upwards.

3. The electroplating wastewater resource utilization treatment system according to claim 1, characterized in that: The first stirring assembly includes a frame, a motor, a stirring shaft, a first bearing housing, a first stirring blade, and a second stirring blade; The top of the tank is fixed with a frame and a first bearing seat. The frame is fixed with a motor. The bottom of the motor is fixed with a stirring shaft. The lower part of the stirring shaft passes through the first bearing seat and the top wall of the tank, and extends into the interior of the tank where a first stirring blade and a second stirring blade are fixed. The first stirring blade is located below the second stirring blade; The first gear is fixed to the stirring shaft.

4. The electroplating wastewater resource utilization treatment system according to claim 3, characterized in that: The second stirring assembly includes a second bearing housing, a hollow rotating shaft, and a stirring plate; A second bearing seat is fixed to the top of the tank; The bottom end of the hollow rotating shaft passes through the second bearing seat and the top wall of the tank, and extends into the interior of the tank where a stirring plate is fixed. The stirring plate is located between the first stirring blade and the second stirring blade.

5. The electroplating wastewater resource utilization treatment system according to claim 4, characterized in that: The mixing tank also includes a gas supply assembly and a cam; The gas supply assembly is fixed to the frame; The cam is fixed to the stirring shaft, and the air supply component is driven by the cam to supply air. The outlet end of the air supply component extends into the hollow rotating shaft; The stirring plate has a cavity inside, and the upper and lower side walls of the stirring plate have a number of air holes. The air holes are connected to the cavity, and the cavity is connected to the hollow rotating shaft.

6. The electroplating wastewater resource utilization treatment system according to claim 5, characterized in that: Several vents are set at an angle.

7. The electroplating wastewater resource utilization treatment system according to claim 6, characterized in that: The air supply assembly includes a push plate, a push rod, a piston, a cylinder, a connecting rod, an inlet pipe, an outlet pipe, a first check valve, and a second check valve. Cylinders are fixed on both the left and right sides of the frame. A piston is slidably connected inside the cylinder. A push rod is fixed to the inner end of the piston. A push plate is fixed to the inner end of the push rod. The push plates on the left and right sides are connected by connecting rods; The push plates on the left and right sides are located on the left and right sides of the cam, respectively, and are in contact with the cam; An intake pipe is fixedly connected to the top wall of the cylinder, and the intake pipe is equipped with a first one-way valve. An outlet pipe is fixedly connected to the top wall of the cylinder, and the outlet pipe is equipped with a second one-way valve. The bottom end of the air outlet pipe extends into the hollow rotating shaft.

8. A process for the resource-based treatment of electroplating wastewater, characterized in that, The electroplating wastewater resource utilization treatment system according to any one of claims 1-7 is used for treatment, including the following steps: Electroplating wastewater is sent to a resin adsorption device for resin adsorption treatment. The eluent obtained from the treatment is sent to a membrane concentration device for membrane concentration treatment. The concentrated solution obtained from the treatment is sent to an electrolytic cell for electrolysis treatment to obtain valuable metals. The dialysis solution obtained from resin adsorption treatment, the permeate obtained from membrane concentration treatment, and the residual liquid obtained from electrolysis treatment are sent to a mixing tank for mixing. The mixed solution after the mixing treatment is sent to a submerged ultrafiltration membrane tank for ultrafiltration treatment. The filtrate obtained from the ultrafiltration treatment is sent to an electrodialysis device for electrodialysis treatment. The desalinated solution obtained from the treatment is sent to a reverse osmosis device for reverse osmosis treatment to obtain permeate water. The concentrated solution obtained from the treatment is sent to a bipolar membrane electrodialysis device for electrodialysis treatment again to obtain acid solution and alkali solution. The alkaline solution is recycled to the submerged ultrafiltration membrane tank.

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