Electroplating wastewater resourceful treatment system and process

Abstract

The invention discloses an electroplating wastewater resourceful treatment system and technology, and belongs to the field of electroplating wastewater treatment.The electroplating wastewater resourceful treatment system is characterized in that an eluent outlet of a resin adsorption device is communicated with a membrane concentration device, and a concentrated solution outlet of the membrane concentration device is communicated with an electrolytic tank; a dialysate outlet of the resin adsorption device, a permeate outlet of the membrane concentration device and a residual liquid outlet of the electrolytic tank are all communicated with the mixing tank, a water outlet of the mixing tank is communicated with the immersed ultrafiltration membrane tank, a filtrate outlet of the immersed ultrafiltration membrane tank is communicated with the electrodialysis equipment, a desalinated liquid outlet of the electrodialysis equipment is communicated with the reverse osmosis equipment, and the reverse osmosis equipment is communicated with the membrane concentration device. A concentrated solution outlet of the electrodialysis equipment is communicated with the bipolar membrane electrodialysis equipment, and an alkali liquor outlet of the bipolar membrane electrodialysis equipment is communicated with the immersed ultrafiltration membrane pool. Resourceful treatment is carried out, valuable metal is obtained, acid liquor and alkali liquor are obtained, and produced water is discharged after reaching the standard; and the liquid in each step is treated, so that zero-pollution emission is achieved.

Description

Technical Field

[0001] The invention belongs to the field of electroplating wastewater treatment, and in particular relates to a system and process for resource-based treatment of electroplating wastewater. Background Art

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

[0003] The integrated electroplating wastewater treatment equipment with application number CN202411025804.7 includes a main control box, a pretreatment cylinder, a centrifugal outer cylinder, and a recovery cylinder. The pretreatment cylinder, the centrifugal outer cylinder, and the recovery cylinder are all arranged at the top of the main control box. The interior of the pretreatment cylinder is provided with a pretreatment mechanism with a filtering and slag removal mechanism, the interior of the centrifugal outer cylinder is provided with a deep purification mechanism with a microprocessing mechanism, and the interior of the recovery cylinder is provided with an electrolytic recovery mechanism with a ventilation mechanism. It recovers heavy metal ions by electrolysis, but does not perform subsequent treatment on the electrolytic residual liquid and other treatment liquids, and the resource treatment of electroplating wastewater is insufficient. Summary of the invention

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

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] The present invention provides a system for resource-based treatment of electroplating wastewater, comprising a resin adsorption device, a membrane concentration device, an electrolytic cell, a mixing tank, an immersed ultrafiltration membrane pool, an electrodialysis device, a reverse osmosis device, and a bipolar membrane electrodialysis device. The eluate 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 dialysate 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 water outlet of the mixing tank is connected to the immersed ultrafiltration membrane pool, the filtrate outlet of the immersed ultrafiltration membrane pool is connected to the electrodialysis device, the desalinated liquid outlet of the electrodialysis device is connected to the reverse osmosis device, the concentrated liquid outlet of the electrodialysis device is connected to the bipolar membrane electrodialysis device, and the alkali liquid outlet of the bipolar membrane electrodialysis device is connected to the immersed ultrafiltration membrane pool.

[0007] Preferably, the mixing tank includes a tank body, a liquid collecting component, a rotating table, a gear ring, a first gear, a second gear, a first stirring component, a second stirring component, an atomizing nozzle, a mounting seat, a sealing ring, a first liquid inlet pipe, and a second liquid inlet pipe. The rotating table and the mounting seat are fixed to the inner top wall of the tank body, the rotating end of the rotating table is fixed to the gear ring, the first stirring component and two second stirring components are fixed to the top of the tank body, the rotating ends of the two second stirring components are respectively located on the left and right sides of the rotating end of the first stirring component, the first gear is fixed to the rotating end of the first stirring component, the second gear is fixed to the rotating end of the second stirring component, the first gear is meshed with the second gear, the second gear is meshed with the gear ring, the interior of the gear ring has a first annular groove, and a plurality of atomizing nozzles are distributed at intervals along the circumference of the bottom of the gear ring, and the atomizing nozzles are meshed with the first An annular groove is connected, the mounting seat is sleeved outside the gear ring, and a second annular groove is provided in the mounting seat, the second annular groove is connected to the first annular groove, and a sealing ring is provided between the gear ring and the mounting seat on the upper and lower sides of the first annular groove, the first liquid inlet pipe is fixed to the side wall of the mounting seat, and the top end passes through the top wall of the tank body and extends to the outside of the tank body, the first liquid inlet pipe is connected to the second annular groove, the side wall of the tank body has two arc-shaped cavities arranged opposite to each other on the left and right, the inner wall of the tank body has a plurality of spray holes connected to the arc-shaped cavities, the left and right outer walls of the tank body are fixed with second liquid inlet pipes, the second liquid inlet pipe is connected to the arc-shaped cavity, the liquid inlet end of the liquid collecting component is 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, and the liquid outlet end of the liquid collecting component is respectively connected to the first liquid inlet pipe and the second liquid inlet pipe.

[0008] Preferably, the liquid collecting component includes a liquid collecting box, a partition, a pipeline, a valve, and a pressure pump. Two partitions are fixed inside the liquid collecting box, and the two partitions divide the internal space of the liquid collecting box into three liquid collecting chambers. The tops of the three liquid collecting 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 end of each liquid collecting chamber is fixedly connected to a pipeline. The pipeline is sequentially provided with valves and a pressure pump along the liquid flow direction. The three liquid collecting chambers are respectively connected to the first liquid inlet pipe and the second liquid inlet pipe through the pipeline.

[0009] Preferably, the plurality of spray holes include a plurality of spray hole groups spaced apart along the arc direction of the arc-shaped cavity, each spray hole group includes a plurality of spray holes spaced apart along the height direction of the tank body, and the spray holes are arranged to be 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 body, the motor is fixed to the frame, the stirring shaft is fixed to the bottom end of the motor, the lower part of the stirring shaft passes through the first bearing seat and the top wall of the tank body, and extends to the interior of the tank body where the first stirring blade and the second stirring blade are fixed, the first stirring blade is located below the second stirring blade, and the 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 on the top of the tank body. The bottom end of the hollow rotating shaft passes through the second bearing seat and the top wall of the tank body and extends to the interior of the tank body where a 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 end of the air supply component extends into the hollow rotating shaft. There is a cavity in the stirring plate. The upper and lower side walls of the stirring plate have a plurality of air holes. The air holes are connected to the cavity, and the cavity is connected to the hollow rotating shaft.

[0013] Preferably, the plurality of air holes are arranged obliquely.

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

[0015] The present invention also provides a process for resource-based treatment of electroplating wastewater, which adopts the above-mentioned electroplating wastewater resource-based treatment system for treatment, and comprises the following steps: sending the electroplating wastewater into a resin adsorption device for resin adsorption treatment, sending the eluate obtained by the treatment into a membrane concentration device for membrane concentration treatment, sending the concentrated solution obtained by the treatment into an electrolytic cell for electrolysis treatment to obtain valuable metals, sending the dialysate obtained by the resin adsorption treatment, the permeate obtained by the membrane concentration treatment, and the residual liquid obtained by the electrolysis treatment into a mixing tank for mixing treatment, sending the mixed solution after the mixing treatment into an immersed ultrafiltration membrane pool for ultrafiltration treatment, sending the filtrate obtained by the ultrafiltration treatment into an electrodialysis device for electrodialysis treatment, sending the desalinated liquid obtained by the treatment into a reverse osmosis device for reverse osmosis treatment to obtain produced water, sending the concentrated solution obtained by the treatment into a bipolar membrane electrodialysis device for electrodialysis treatment again to obtain acid solution and alkali solution, and the alkali solution is reused in the immersed ultrafiltration membrane pool.

[0016] The beneficial effects of the present invention are:

[0017] 1. Carry out resource processing to obtain not only valuable metals, but also acid and alkali solutions, and the produced water meets the discharge standards; by treating the liquids in each step, zero pollution discharge can be achieved.

[0018] 2. Use a mixing tank to mix the dialysate obtained from resin adsorption treatment, the permeate obtained from membrane concentration treatment, and the residual liquid obtained from electrolysis treatment, and then send them into the submerged ultrafiltration membrane pool, so that the water quality of the mixed liquid is more uniform and stable, providing more favorable water quality conditions for subsequent treatment steps.

[0019] 3. The dialysate obtained by resin adsorption treatment and the residual liquid obtained by electrolysis treatment are dispersed and collided inside the tank in the form of left and right sprays to perform preliminary mixing of the two; the dialysate obtained by resin adsorption treatment and the residual liquid obtained by electrolysis treatment that collide left and right are mixed in the form of atomized spraying to perform preliminary mixing of the three; finally, they fall to the bottom of the tank and are double stirred by the first stirring component and the second stirring component to perform a more thorough, uniform and efficient mixing.

[0020] 4. Through the cooperation between the mounting seat and the gear ring, the gear ring can still stably take in liquid during the rotation process.

[0021] 5. When the first stirring component is stirring, it drives the first gear to rotate, so that the second gears on both sides rotate in the opposite direction, driving the second stirring component to rotate, and at the same time driving the gear ring to rotate, realizing rotary spraying, with a wider and more comprehensive spray range and better mixing effect.

[0022] 6. Only one driving source of the first stirring component is needed to realize reverse stirring operation and rotary spraying treatment with the second stirring component, which is an ingenious design.

[0023] 7. Through the setting of three pipelines and valves, the delivery of dialysate obtained by resin adsorption treatment, permeate obtained by membrane concentration treatment, and residual liquid obtained by electrolysis treatment are controlled respectively to meet different operational requirements; the liquid is pressurized by a pressure pump, which is conducive to the subsequent liquid spraying, collision and dispersion.

[0024] 8. The nozzle is tilted upward, so that the droplets can cover a higher area, increasing the vertical coverage of the droplets, and making the sprayed droplets more uniform and delicate, improving the collision and mixing effect

[0025] 9. The rotation direction of the stirring plate is opposite to that of the first stirring blade and the second stirring blade, and the stirring plate is located between the first stirring blade and the second stirring blade. The shear force generated helps to break up the lumps and bubbles in the mixed liquid, making it more uniform, and can further promote and mix the liquid to ensure more sufficient stirring; this stirring method can also reduce dead angles during the stirring process to ensure that all liquids can be fully mixed; the reverse rotation of the stirring plate and the first stirring blade and the second stirring blade helps to form convection, that is, the liquid forms an up and down, left and right circulation flow in the tank body. 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, the mixed liquid is pushed by airflow to drive the mixed liquid to be mixed more fully, thereby improving the mixing efficiency. The synergistic effect of ventilation and stirring can improve the stirring effect and make the mixed liquid more uniform and delicate.

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

[0028] 12. The inclined air holes can 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 in the inclined direction, and at the same time will produce certain radial and tangential components, which are helpful for mixing and evenly distributing the liquid.

[0029] 13. The one-supply-one-wait setting of the air supply assembly, combined with the continuously rotating stirring plate, the first stirring blade, and the second stirring blade, greatly improves the stirring and mixing effect. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0032] Figure 3 It is a schematic diagram of the cross-sectional structure of the tank body of the present invention.

[0033] Figure 4 yes Figure 3 Schematic diagram of the enlarged structure of A.

[0034] Figure 5 It is a schematic diagram of the matching structure of the first gear, the second gear, the gear ring, the mounting seat, and the rotating platform of the present invention.

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

[0036] Figure 7 It is a schematic diagram of the matching structure of the motor, cam, stirring shaft, and air supply assembly of the present invention.

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

[0038] The marks in the accompanying drawings are: 100-resin adsorption device, 200-membrane concentration device, 300-electrolytic cell, 400-mixing tank, 500-immersed ultrafiltration membrane pool, 600-electrodialysis equipment, 700-reverse osmosis equipment, 800-bipolar membrane electrodialysis equipment, 1-tank body, 2-rotating table, 3-gear ring, 4-liquid collecting assembly, 5-first gear, 6-second gear, 7-first stirring assembly, 8-second stirring assembly, 9-atomizing nozzle, 10-mounting seat, 11-sealing ring, 12-first liquid inlet pipe, 13-second liquid inlet pipe, 14-first annular groove, 15-second annular groove, 16-arc cavity, 17- Spray hole, 41-liquid collecting box, 42-partition, 43-pipeline, 44-valve, 45-pressure pump, 46-liquid collecting chamber, 71-frame, 72-motor, 73-stirring shaft, 74-first bearing seat, 75-first stirring blade, 76-second stirring blade, 81-second bearing seat, 82-hollow rotating shaft, 83-stirring plate, 18-air supply assembly, 19-cam, 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 one-way valve, 189-second one-way valve. DETAILED DESCRIPTION

[0039] The present invention will now be further described with reference to the accompanying drawings and specific implementation methods.

[0040] Contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field. In the description of the present invention, it should be understood that the orientation or position relationship indicated by the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0041] like Figures 1 to 8As shown, a system for resource-based treatment of electroplating wastewater provided in this embodiment includes a resin adsorption device 100, a membrane concentration device 200, an electrolytic cell 300, a mixing tank 400, an immersed ultrafiltration membrane pool 500, an electrodialysis device 600, a reverse osmosis device 700, and a bipolar membrane electrodialysis device 800. The eluate outlet of the resin adsorption device 100 is connected to the membrane concentration device 200, the concentrated liquid outlet of the membrane concentration device 200 is connected to the electrolytic cell 300, and the dialysate outlet of the resin adsorption device 100, the membrane concentration device 200, and the dialysis liquid outlet of the membrane concentration device 200 are connected to the electrolytic cell 300. The permeate outlet of the shrinkage device 200 and the residual liquid outlet of the electrolytic cell 300 are both connected to the mixing tank 400, the water outlet of the mixing tank 400 is connected to the submerged ultrafiltration membrane pool 500, the filtrate outlet of the submerged ultrafiltration membrane pool 500 is connected to the electrodialysis equipment 600, the desalinated liquid outlet of the electrodialysis equipment 600 is connected to the reverse osmosis equipment 700, the concentrated liquid outlet of the electrodialysis equipment 600 is connected to the bipolar membrane electrodialysis equipment 800, and the alkali solution outlet of the bipolar membrane electrodialysis equipment 800 is connected to the submerged ultrafiltration membrane pool 500.

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

[0043] The electroplating wastewater is sent to the resin adsorption device 100 for resin adsorption treatment, the eluate obtained by the treatment is sent to the membrane concentration device 200 for membrane concentration treatment, the concentrated solution obtained by the treatment is sent to the electrolytic cell 300 for electrolysis treatment to obtain valuable metals, the dialysate obtained by the resin adsorption treatment, the permeate obtained by the membrane concentration treatment, and the residual liquid obtained by the electrolysis treatment are sent to the mixing tank 400 for mixing treatment, the mixed solution after the mixing treatment is sent to the submerged ultrafiltration membrane pool 500 for ultrafiltration treatment, the filtrate obtained by the ultrafiltration treatment is sent to the electrodialysis equipment 600 for electrodialysis treatment, the desalinated liquid obtained by the treatment is sent to the reverse osmosis equipment 700 for reverse osmosis treatment to obtain water, and the concentrated solution obtained by the treatment is sent to the bipolar membrane electrodialysis equipment 800 for electrodialysis treatment again to obtain acid solution and alkali solution, and the alkali solution is reused to the submerged ultrafiltration membrane pool 500. In this way, resource recovery treatment is carried out to obtain not only valuable metals, but also acid solution and alkali solution, and the produced water meets the discharge standards. By treating the liquids in each step, zero pollution discharge is achieved. The dialysate obtained by resin adsorption treatment, the permeate obtained by membrane concentration treatment, and the residual liquid obtained by electrolysis treatment are mixed in a mixing tank 400 and then sent to the submerged ultrafiltration membrane pool 500, so that the water quality of the mixed liquid is more uniform and stable, providing more favorable water quality conditions for subsequent treatment steps.

[0044] Among them, the mixing tank 400 includes a tank body 1, a liquid collecting component 4, a rotating table 2, a gear ring 3, a first gear 5, a second gear 6, a first stirring component 7, a second stirring component 8, an atomizing nozzle 9, a mounting seat 10, a sealing ring 11, a first liquid inlet pipe 12, and a second liquid inlet pipe 13. The rotating table 2 and the mounting seat 10 are fixed to the inner top wall of the tank body 1. The rotating end of the rotating table 2 is fixed with a gear ring 3. The top of the tank body 1 is fixed with a first stirring component 7 and two second stirring components 8. The rotating ends of the two second stirring components 8 are respectively located on the left and right sides of the rotating end of the first stirring component 7. The first gear 5 is fixed to the rotating end of the first stirring component 7, and the second gear 6 is fixed to the rotating end of the second stirring component 8. The first gear 5 is meshed with the second gear 6, and the second gear 6 is meshed with the gear ring 3. The interior of the gear ring 3 has a first annular groove 14, and a plurality of atomizing nozzles 9 are distributed at intervals along the circumference of the bottom of the gear ring 3. The atomizing nozzles 9 are connected to the first annular groove 14. The mounting seat 10 is sleeved outside the gear ring 3, and the mounting seat 10 has a second annular groove 15, which is connected to the first annular groove 14. A sealing ring 11 is provided between the gear ring 3 and the mounting seat 10 on both sides of the first annular groove 14. The first liquid inlet pipe 12 is fixed to the side wall of the mounting seat 10, and the top end passes through the top wall of the tank body 1 and extends to the outside of the tank body 1. The first liquid inlet pipe 12 is connected to the second annular groove 15, and the side wall of the tank body 1 has two arc-shaped holes arranged opposite to each other. The inner wall of the tank body 1 has a plurality of spray holes 17 connected to the arc-shaped cavity 16. The left and right outer walls of the tank body 1 are both fixed with a second liquid inlet pipe 13, which is connected to the arc-shaped cavity 16. The liquid inlet end of the liquid collection component 4 is 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. The liquid outlet end of the liquid collection component 4 is respectively connected to the first liquid inlet pipe 12 and the second liquid inlet pipe 13. The dialysate obtained by the resin adsorption treatment, the permeate obtained by the membrane concentration treatment, and the residual liquid obtained by the electrolysis treatment are collected by the liquid collection component 4 and transported to various positions of the tank body 1. Specifically, the dialysate obtained by the resin adsorption treatment enters the arc-shaped cavity on the left and is sprayed out through the spray hole 17, and the residual liquid obtained by the electrolysis treatment enters the arc-shaped cavity on the right and is sprayed out through the spray hole 17. The dialysate obtained by resin adsorption treatment and the residual liquid obtained by electrolysis treatment collide and disperse in the form of left and right sprays inside the tank body 1 to perform preliminary mixing of the two. In addition, the permeate obtained by membrane concentration treatment enters the second annular groove 15 through the first liquid inlet pipe 12, flows to the atomizing nozzle 9 through the first annular groove 14, and is sprayed downward by the atomizing nozzle 9. It is sprayed in the form of atomization spraying and mixed with the dialysate obtained by resin adsorption treatment and the residual liquid obtained by electrolysis treatment that collide left and right, and the three are initially mixed, and finally fall to the bottom of the tank body 1, and double stirring treatment is performed by the first stirring component 7 and the second stirring component 8, so that the mixing is more thorough, uniform and efficient. Through the cooperation of the mounting seat 10 and the ring gear 3, the ring gear 3 can still stably inlet liquid during the rotation process.When the first stirring component 7 is stirring, it drives the first gear 5 to rotate, so that the second gears 6 on both sides rotate in the opposite direction, driving the second stirring component 8 to rotate, and at the same time driving the gear ring 3 to rotate, so as to realize rotary spraying, with a wider and more comprehensive spraying range and better mixing effect. Only one driving source of the first stirring component 7 is needed to realize reverse stirring operation and rotary spraying treatment with the second stirring component 8, which is a clever design.

[0045] The liquid collecting assembly 4 includes a liquid collecting box 41, a partition 42, a pipe 43, a valve 44, and a pressure pump 45. Two partitions 42 are fixed inside the liquid collecting box 41. The two partitions 42 divide the internal space of the liquid collecting box 41 into three liquid collecting chambers 46. The tops of the three liquid collecting 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. The bottom of each liquid collecting chamber 46 is fixedly connected to a pipe 43. The pipe 43 is sequentially provided with a valve 44 and a pressure pump 45 along the liquid flow direction. The three liquid collecting chambers 46 are respectively connected to the first liquid inlet pipe 12 and the second liquid inlet pipe 13 through the pipe 43. The three liquid collecting chambers 46 are integrated into a liquid collecting box 41 to reduce space occupation. Through the setting of the three pipes 43 and the valve 44, the transmission of the dialysate obtained by the resin adsorption treatment, the permeate obtained by the membrane concentration treatment, and the residual liquid obtained by the electrolysis treatment is controlled respectively to meet different operation requirements. Pressurizing the liquid by the pressure pump 45 is beneficial to the subsequent liquid spraying, collision and dispersion.

[0046] The plurality of spray holes 17 include a plurality of spray holes 17 groups spaced apart along the arc direction of the arc cavity 16, each spray hole 17 group includes a plurality of spray holes 17 spaced apart along the height direction of the tank body 1, and the spray holes 17 are arranged upwardly tilted. The spray holes 17 are spaced apart along the arc direction of the arc cavity 16, which can ensure that the sprayed droplets are evenly distributed within the range of the arc cavity 16. The spray holes 17 are arranged upwardly tilted, so that the droplets can cover a higher area, increase the vertical coverage range of the droplets, and make the sprayed droplets more uniform and delicate, thereby 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 body 1. The motor 72 is fixed to the frame 71. 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 body 1, and extends to the inside of the tank body 1. 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 the first gear 5 is fixed to the stirring shaft 73. The motor 72 rotates, driving the stirring shaft 73 to rotate, so that the first stirring blade 75 and the second stirring blade 76 rotate to stir and mix the mixed liquid that falls down.

[0048] Wherein, the second stirring assembly 8 comprises a second bearing seat 81, a hollow rotating shaft 82, and a stirring plate 83. The second bearing seat 81 is fixed on the top of the tank body 1. The bottom end of the hollow rotating shaft 82 passes through the second bearing seat 81 and the top wall of the tank body 1, and extends to the inside of the tank body 1 to be fixed with a stirring plate 83, and the stirring plate 83 is located between the first stirring blade 75 and the second stirring blade 76. The stirring shaft 73 rotates, driving the first gear 5 to rotate, so that the second gear 6 rotates in the opposite direction, driving the hollow rotating shaft 82 to rotate in the opposite direction, so that the stirring plate 83 rotates 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 helps to break the lumps and bubbles in the mixed liquid, making it more uniform, and can further promote and mix the liquid to ensure more sufficient stirring. This stirring method can also reduce dead angles during the stirring process to ensure that all liquids can be fully mixed. The reverse rotation of the stirring plate 83 and 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 circulation flow in the tank body 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 further includes an air supply assembly 18 and a cam 19. The air supply assembly 18 is fixed to the frame 71, and the cam 19 is fixed to the stirring shaft 73. The cam 19 pushes the air supply assembly 18 to supply air. The air outlet of the air supply assembly 18 extends into the hollow shaft 82. The stirring plate 83 has a cavity 831. The upper and lower side walls of the stirring plate 83 have a plurality of air holes 832. The air holes 832 are connected to the cavity 831, and the cavity 831 is connected to the hollow shaft 82. The stirring shaft 73 drives the cam 19 to rotate, so that the air supply assembly 18 blows air, and the air flow enters the cavity 831 of the stirring plate 83 through the hollow shaft 82, and finally is discharged through the air holes 832. While the stirring operation is being performed, the mixed liquid is pushed by the air flow, and the mixed liquid is driven to be mixed more fully, thereby improving the mixing efficiency. The synergistic effect of ventilation and stirring can improve the stirring effect, making the mixed liquid more uniform and delicate. Furthermore, the air supply operation of the air supply assembly 18 does not require an additional driving source, and is directly driven by the stirring shaft 73 in combination with the cam 19 to achieve air supply. The design is ingenious and saves energy.

[0050] Among them, the plurality of air holes 832 are all arranged at an angle. The air holes 832 arranged at an angle are adopted. The inclined gas discharge can form a more complex and intense flow pattern of the gas 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, it will also generate certain radial and tangential components, which are helpful for 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. The cylinder 184 is fixed on both sides of the frame 71. The piston 183 is slidably connected in the cylinder 184. The push rod 182 is fixed to the inner end of the piston 183. The push plate 181 is fixed to the inner end of the push rod 182. The push plates 181 on both sides are connected by a connecting rod 185. The push plates 181 on the left and right sides are respectively located on the left and right sides of the cam 19 and are in contact with the cam 19. The top wall of the cylinder body 184 is fixedly connected with an air inlet pipe 186, and the air inlet pipe 186 is provided with a first one-way valve 188. The top wall of the cylinder body 184 is fixedly connected with an air outlet pipe 187, and the air outlet pipe 187 is provided with a second one-way valve 189. The bottom end of the air outlet pipe 187 extends into the hollow rotating shaft 82. In the process of the cam 19 following the rotation of the stirring shaft 73, the push plate 181 is repeatedly pushed to move left and right, driving the push rod 182 to move left and right, so that the piston 183 moves left and right, and continuously pumping air into the tank body 1. When the cylinder body 184 on the right side is pumped, the cylinder body 184 on the left side is exhausted, and when the cylinder body 184 on the right side is exhausted, the cylinder body 184 on the left side is pumped. In this way, a one-supply and one-wait arrangement is achieved, and the stirring and mixing effect is greatly improved by combining the continuously rotating stirring plate 83, the first stirring blade 75, and the second stirring blade 76. The arrangement of the first one-way valve 188 allows the gas to enter the cylinder 184 only from the air inlet pipe 186, and the gas in the cylinder 184 will not be discharged through the air inlet pipe 186. The arrangement of the second one-way valve 189 allows the gas in the cylinder 184 to be discharged only from the air outlet pipe 187, and the gas outside the cylinder 184 will not enter the cylinder 184 through the air outlet pipe 187.

[0052] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, it should be understood by those skilled in the art that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A system for recycling electroplating wastewater, characterized in that: Including resin adsorption devices, membrane concentration devices, electrolytic cells, mixing tanks, immersed ultrafiltration membrane cells, 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 dialysate 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 water outlet of the mixing tank is connected to the submerged ultrafiltration membrane pool, the filtrate outlet of the submerged ultrafiltration membrane pool is connected to the electrodialysis device, the desalinated liquid outlet of the electrodialysis device is connected to the reverse osmosis device, and the concentrated liquid outlet of the electrodialysis device is connected to the bipolar membrane electrodialysis device; The alkaline solution outlet of the bipolar membrane electrodialysis equipment is communicated with the submerged ultrafiltration membrane pool.

2. The electroplating wastewater resource treatment system according to claim 1 is characterized in that: The mixing tank comprises a tank body, a liquid collecting 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 seat, a sealing ring, a first liquid inlet pipe, and a second liquid inlet pipe; A rotating platform and a mounting seat are fixed to the inner top wall of the tank body; A gear ring is fixed to the rotating end of the rotating table; A first stirring assembly and two second stirring assemblies are fixed on the top of the tank body, and the rotating ends of the two second stirring assemblies are respectively located on the left and right sides of the rotating end of the first stirring assembly; The first gear is fixed to the rotating end of the first stirring component, the second gear is fixed to the rotating end of the second stirring component, the first gear is meshed with the second gear, and the second gear is meshed with the ring gear; The gear 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 gear ring, and the atomizing nozzles are connected to the first annular groove; The mounting seat is sleeved outside the gear ring, and a second annular groove is formed inside the mounting seat, and the second annular groove is communicated with the first annular groove; Sealing rings are provided between the gear rings and the mounting seat at the upper and lower sides of the first annular groove; The first liquid inlet pipe is fixed to the side wall of the mounting seat, and the top end thereof passes through the top wall of the tank body and extends outside the tank body, and the first liquid inlet pipe is communicated with the second annular groove; The side wall of the tank body has two arc-shaped cavities arranged opposite to each other on the left and right sides, the inner side wall of the tank body has a plurality of spray holes connected to the arc-shaped cavities, and the left and right outer side walls of the tank body are both fixed with second liquid inlet pipes, which are connected to the arc-shaped cavities; The liquid inlet end of the liquid collection component is 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 liquid outlet end of the liquid collecting assembly is communicated with the first liquid inlet pipe and the second liquid inlet pipe respectively.

3. The electroplating wastewater resource treatment system according to claim 2 is characterized in that: The liquid collecting assembly includes a liquid collecting box, a partition, a pipeline, a valve, and a pressure pump; Two partitions are fixed inside the liquid collecting box, and the two partitions divide the internal space of the liquid collecting box into three liquid collecting chambers, and the tops of the three liquid collecting 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 end of each liquid collecting cavity is fixedly connected with a pipeline, and the pipeline is provided with valves and a pressure pump in sequence along the liquid flow direction; The three liquid collecting chambers are respectively connected with the first liquid inlet pipe and the second liquid inlet pipe through pipelines.

4. The electroplating wastewater resource treatment system according to claim 2 is characterized in that: The plurality of spray holes include a plurality of spray hole groups spaced apart along the arc direction of the arc-shaped cavity; Each group of spray holes includes a number of spray holes spaced apart and distributed along the height direction of the tank body; The spray hole is arranged to be inclined upward.

5. The electroplating wastewater resource treatment system according to claim 2 is characterized in that: 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; A frame and a first bearing seat are fixed on the top of the tank body, a motor is fixed on the frame, a stirring shaft is fixed on the bottom end of the motor, a lower portion of the stirring shaft passes through the first bearing seat and the top wall of the tank body, and extends to the inside of the tank body 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.

6. The electroplating wastewater resource treatment system according to claim 5 is characterized in that: The second stirring assembly includes a second bearing seat, a hollow rotating shaft, and a stirring plate; A second bearing seat is fixed on the top of the tank body; The bottom end of the hollow rotating shaft passes through the second bearing seat and the top wall of the tank body, and extends to the inside of the tank body where a stirring plate is fixed; The stirring plate is located between the first stirring blade and the second stirring blade.

7. The electroplating wastewater resource treatment system according to claim 6 is characterized in that: The mixing tank also includes an air supply assembly and a cam; The air supply assembly is fixed to the frame; The cam is fixed to the stirring shaft, and the air supply assembly is pushed by the cam to supply air; The air 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 plurality of air holes, the air holes are connected with the cavity, and the cavity is connected with the hollow rotating shaft.

8. The electroplating wastewater resource treatment system according to claim 7 is characterized in that: The plurality of air holes are all arranged obliquely.

9. The electroplating wastewater resource treatment system according to claim 8, characterized in that: The air supply assembly includes a push plate, a push rod, a piston, a cylinder body, a connecting rod, an air inlet pipe, an air outlet pipe, a first one-way valve, and a second one-way valve; A cylinder body is fixed on both the left and right sides of the frame, a piston is slidably connected in the cylinder body, a push rod is fixed on the inner end of the piston, and a push plate is fixed on 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 respectively located on the left and right sides of the cam and are in contact with the cam; The top wall of the cylinder body is fixedly connected with an air inlet pipe, and the air inlet pipe is provided with a first one-way valve; the top wall of the cylinder body is fixedly connected with an air outlet pipe, and the air outlet pipe is provided with a second one-way valve; The bottom end of the air outlet pipe extends into the hollow rotating shaft.

10. A process for recycling electroplating wastewater, characterized in that: The electroplating wastewater resource treatment system according to any one of claims 1 to 9 is used for treatment, comprising the following steps: The electroplating wastewater is sent to a resin adsorption device for resin adsorption treatment, the eluate obtained by the treatment is sent to a membrane concentration device for membrane concentration treatment, and the concentrated solution obtained by the treatment is sent to an electrolytic cell for electrolysis treatment to obtain valuable metals; The dialysate obtained by resin adsorption treatment, the permeate obtained by membrane concentration treatment, and the residual liquid obtained by electrolysis treatment are sent to a mixing tank for mixing treatment; The mixed liquid after the mixing treatment is sent to an immersed ultrafiltration membrane pool for ultrafiltration treatment, the filtrate obtained by the ultrafiltration treatment is sent to an electrodialysis device for electrodialysis treatment, the desalinated liquid obtained by the treatment is sent to a reverse osmosis device for reverse osmosis treatment to obtain produced water, and the concentrated liquid obtained by the treatment is sent to a bipolar membrane electrodialysis device for electrodialysis treatment again to obtain acid solution and alkali solution; The alkali solution is recycled to the submerged ultrafiltration membrane pool.

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