Device and method for simultaneous treatment of regeneration of iron poisoning resin and electroplating wastewater

Abstract

The application discloses a device and method for regeneration of iron-poisoned resin and synchronous treatment of electroplating wastewater. The iron-poisoned resin in the iron-poisoned resin storage tank is introduced into a spray cleaning tower to remove impurities, cleaning water is pumped into the spray cleaning tower through a physical purification of a partition grid, the iron-poisoned resin after impurity removal is introduced into a pretreatment device for pretreatment, the pretreated resin is introduced into a resin regeneration-electroplating wastewater synchronous treatment device, and filtered electroplating wastewater is introduced to replace metal ions, generated iron-containing complex wastewater is introduced into an iron-containing tail water treatment device for treatment and discharge after reaching the standard, and generated resin is introduced into a resin regeneration device for resin regeneration and heavy metal resource recovery. The application can continuously realize the regeneration of the iron-poisoned resin and the synchronous treatment of the electroplating wastewater, the treatment effect of the heavy metal citric acid complex is remarkable, the resin regeneration rate is greater than 90%, and the heavy metal recovery rate is greater than 90%.

Description

Technical Field

[0001] This invention belongs to the field of iron poisoning resin and electroplating wastewater treatment, and relates to an apparatus and method for the simultaneous regeneration of iron poisoning resin and treatment of electroplating wastewater. Background Technology

[0002] Ion exchange resins are a class of polymeric compounds with a network structure containing functional groups. Their structure consists of three parts: an insoluble three-dimensional network framework, functional groups attached to the framework, and exchangeable ions with opposite charges. Due to their unique active functional groups, they can undergo ion exchange adsorption with heavy metals to remove, concentrate, and recover heavy metal ions from solutions. Ion exchange resins have the advantages of large specific surface area, high adsorption capacity, and easy desorption and regeneration, making them widely used in the treatment of heavy metal-contaminated wastewater. However, natural water contains calcium... 2+ Mg 2+ Fe 3+ Metal ions, but more Fe 3+ The corrosion from iron salt coagulants used in the pretreatment of tap water, water treatment equipment, and pipelines can cause ion exchange resins to be affected by Fe during use. 3+ Contamination by iron leads to a decrease in the working exchange capacity of the resin, affecting the quality of the effluent. This phenomenon is commonly known as iron poisoning. Currently, common resin regeneration methods include hydrochloric acid regeneration, NaCl regeneration, and reduction regeneration. While these methods can achieve certain regeneration effects, they are prone to problems due to the presence of iron (Fe). 3+ Iron-poisoned resins have a strong binding affinity to cation exchange resins, so conventional regeneration methods suffer from poor regeneration efficiency, long regeneration cycles, and excessive reagent dosage. Therefore, it is essential to find an economical, simple, and efficient method for regenerating iron-poisoned resins.

[0003] Disodium ethylenediaminetetraacetate (Na2-EDTA), a common regenerator, can efficiently desorb heavy metal ions captured by adsorbents (such as ion exchange resins and biochar). The principle is based on the fact that, in the octahedral coordination field formed by HM-EDTA and Fe(III)-EDTA, Fe(III)-EDTA has a larger absolute value of crystal field stabilization energy compared to HM-EDTA, resulting in a larger complexation stability constant. Therefore, it can successfully discomplex and release heavy metal ions adsorbed in ion exchange resins into the solution. However, this method often requires the addition of large amounts of chemical reagents in practical applications, increasing costs and potentially causing secondary pollution to the environment.

[0004] Electroplating wastewater is listed as one of the three major global pollutants. During the electroplating process, to increase the conductivity of the plating solution and improve electroplating efficiency, large amounts of organic chelating agents (such as ethylenediaminetetraacetic acid, citric acid, pyrophosphate, etc.) are often added. These organic chelating agents form stable heavy metal complexes with heavy metal ions, which leads to a more complex composition of electroplating wastewater and makes it more difficult to treat. Displacement-precipitation, as a common method for removing heavy metal complexes, utilizes Fe... 3+ Fe exhibits higher complexation stability constants with many common organic ligands than with some other common metals. From a thermodynamic perspective, Fe... 3+ It can effectively replace heavy metal ions in heavy metal complexes to form iron complexes, and then remove the free heavy metal ions released into the solution by adding a precipitant or adjusting the pH to alkaline conditions. However, in practical applications, there are still problems such as the generation of large amounts of iron sludge and the difficulty in recovering metal resources. Summary of the Invention

[0005] This invention provides an apparatus and method for the simultaneous regeneration of iron-poisoned resin and the treatment of electroplating wastewater.

[0006] This invention first introduces iron-poisoned resin into a spray cleaning tower for impurity removal, washing and dissolving organic or inorganic impurities on the resin surface. The resulting wastewater is then physically filtered through a grid to remove inorganic impurities. The purified water is then recycled back into the spray cleaning tower for further impurity removal. The purified resin is then fed into a pretreatment device, with pretreatment solution circulating in a storage tank. This process dissolves iron oxides or iron hydroxides deposited on the resin surface or within its pores into iron ions, resulting in pretreated resin. Finally, the pretreated resin is fed into a resin regeneration-electroplating wastewater simultaneous treatment device. The electroplating wastewater, after being filtered for impurities, is also fed into this device. Through metal displacement and ion exchange, heavy metal complexes in the electroplating wastewater are removed, and iron ions are desorbed from the resin. On one hand, the iron-containing wastewater generated in the resin regeneration-electroplating wastewater simultaneous treatment unit is fed into the iron-containing tailwater treatment unit, where the iron complexes are removed through electrostatic attraction and surface complexation. On the other hand, the resin desorbed from iron ions and adsorbed with heavy metal ions generated in the resin regeneration-electroplating wastewater simultaneous treatment unit enters the resin regeneration tank, where it undergoes ion exchange with sodium chloride solution to desorb heavy metal ions and convert them into Na-type or K-type resin. The regenerated liquid and regenerated resin enter a solid-liquid separation tank for solid-liquid separation. The solid is fed into a regenerated resin storage tank to store the successfully regenerated resin, while the liquid is fed into a heavy metal resource recovery unit, where the heavy metal ions released during ion exchange are recovered by adjusting the pH or adding a precipitant.

[0007] The technical solution of the present invention is as follows:

[0008] An apparatus for the simultaneous regeneration of iron-poisoned resin and treatment of electroplating wastewater includes an iron-poisoned resin storage tank 1, a spray cleaning tower 2, a first water transfer pump 3, a screen 4, a second water transfer pump 5, a pretreatment device 6, a resin regeneration-electroplating wastewater simultaneous treatment device 7, a pretreatment liquid storage tank 8, an electroplating wastewater storage tank 9, a filtration device 10, a third water transfer pump 11, a fourth water transfer pump 12, an iron-containing tailwater treatment device 13, and a resin regeneration device 14. The iron-poisoned resin storage tank 1 is connected to the spray cleaning tower 2. The outlet of the spray cleaning tower 2 is connected to the screen 4 via the first water transfer pump 3, and the outlet of the screen 4 is connected to the screen via the second water transfer pump 5. The system is connected to the inlet of the spray cleaning tower 2, the outlet of the spray cleaning tower 2 is connected to the pretreatment device 6, the outlet of the pretreatment device 6 is connected to the resin regeneration-electroplating wastewater synchronous treatment device 7, the pretreatment liquid storage tank 8 is connected to the pretreatment device 6, the electroplating wastewater storage tank 9 is connected to the filter device 10, the filter device 10 is connected to the inlet of the resin regeneration-electroplating wastewater synchronous treatment device 7 via the No. 3 water transfer pump 11, the outlet of the resin regeneration-electroplating wastewater synchronous treatment device 7 is connected to the iron-containing tailwater treatment device 13 via the No. 4 water transfer pump 12, and the outlet of the resin regeneration-electroplating wastewater synchronous treatment device 7 is connected to the resin regeneration device 14.

[0009] Furthermore, the resin regeneration-electroplating wastewater simultaneous treatment device 7 includes an electroplating wastewater inlet device 71, a pretreatment iron-poisoned resin inlet 72, a first packing column 73, a second packing column 74, an iron-containing wastewater outlet 75, a first packing column outlet 76, and a second packing column outlet 77. The electroplating wastewater inlet device 71 is connected to the first packing column 73, the pretreatment iron-poisoned resin inlet 72 is connected to the first packing column 73 and the second packing column 74, the bottoms of the first packing column 73 and the second packing column 74 are connected, the second packing column 74 is connected to the iron-containing wastewater outlet 75, the first packing column outlet 76 is connected to the first packing column 73, and the second packing column outlet 77 is connected to the second packing column 74.

[0010] Furthermore, the electroplating wastewater inlet device 71 includes an electroplating wastewater inlet 711, an electroplating wastewater inlet pipe 712, and an electroplating wastewater spray head 713. The pretreatment iron poisoning resin inlet 72 includes an upper inlet 721 of the first packing column, a lower inlet 722 of the first packing column, an upper inlet 723 of the second packing column, and a lower inlet 724 of the second packing column. The first packing column 73 includes an upper... The packing column 731 and the first lower packing column 732 are included. The second packing column 74 includes the second upper packing column 741 and the second lower packing column 742. The iron-containing tailwater outlet 75 includes an outlet pipe 751, an outlet 752, and a check valve 753. The discharge port 76 of the first packing column includes a first discharge pipe 761, a first discharge port 762, and a first check valve 763. The discharge port 77 of the second packing column is also included. This includes a second discharge pipe 771, a second discharge port 772, and a second check valve 773. The electroplating wastewater inlet 711 is connected to the electroplating wastewater inlet pipe 712, which is connected to the electroplating wastewater spray head 713. The upper inlet 721 of the first packing column is connected to the first upper packing column 731, and the lower inlet 722 of the first packing column is connected to the first lower packing column 732. The second packing column... The layer inlet 723 is connected to the second upper packing column 741, the second packing column lower inlet 724 is connected to the second lower packing column 742, the water outlet pipe 751 is connected to the water outlet 752 and is equipped with a check valve 753, the first discharge pipe 761 is connected to the first discharge outlet 762 and is equipped with a first check valve 763, and the second discharge pipe 771 is connected to the second discharge outlet 772 and is equipped with a second check valve 773.

[0011] Furthermore, the spray cleaning tower 2 includes an iron poisoning resin inlet 21, a resin conveying pipe 22, an iron poisoning resin packing device 23, a deionized water spraying device 24, an outlet 25, and a water outlet 26; the iron poisoning resin inlet 21 is fixedly connected to the resin conveying pipe 22, the resin conveying pipe 22 is fixedly connected to the top of the iron poisoning resin packing device 23, the outlet 25 is located at the bottom of the iron poisoning resin packing device 23, the deionized water spraying device 24 is located at the top of the spray cleaning tower 2, and the water outlet 26 is located at the bottom of the spray cleaning tower 2.

[0012] Furthermore, the iron-poisoning resin inlet 21 includes an upper iron-poisoning resin inlet 211 and a lower iron-poisoning resin inlet 212; the resin conveying pipe 22 includes an upper resin conveying pipe 221 and a lower resin conveying pipe 222; the iron-poisoning resin packing device 23 includes an upper iron-poisoning resin packing device 231 and a lower iron-poisoning resin packing device 232; the deionized water spraying device 24 includes a deionized water inlet 241 and a spray head 242; the outlet 25 includes an upper outlet 251 and a lower outlet 252; and the water outlet 26 includes a water outlet pipe. 261 and check valve 262; the upper layer inlet 211 and lower layer inlet 212 of the iron poisoning resin are respectively connected to the upper layer iron poisoning resin packing device 231 and the lower layer iron poisoning resin packing device 232 via the upper layer resin conveying pipe 221 and the lower layer resin conveying pipe 222, the deionized water inlet 241 is connected to the spray head 242, the upper layer outlet 251 and the lower layer outlet 252 are respectively located at the bottom of the upper layer iron poisoning resin packing device 231 and the lower layer iron poisoning resin packing device 232, and the water outlet pipe 261 is equipped with a check valve 262.

[0013] Furthermore, the resin regeneration device 14 includes a resin regeneration tank 141, a solid-liquid separation tank 142, a regenerated resin storage tank 143, and a heavy metal resource recovery device 144; one end of the resin regeneration tank 141 is connected to the outlet of the resin regeneration-electroplating wastewater synchronous treatment device 7, which is connected to the inlet of the resin regeneration tank 141; the outlet of the resin regeneration tank 141 is connected to the inlet of the solid-liquid separation tank 142; the solid outlet of the solid-liquid separation tank 142 is connected to the regenerated resin storage tank 143; and the liquid outlet of the solid-liquid separation tank 142 is connected to the heavy metal resource recovery device 144.

[0014] A method for simultaneously regenerating iron-poisoned resin and treating electroplating wastewater, using the aforementioned apparatus, includes the following steps:

[0015] S1: The iron poisoning resin in the iron poisoning resin storage tank 1 is transported to the spray cleaning tower 2 for impurity removal treatment;

[0016] S2: The water effluent from the spray cleaning tower 2 is fed into the screen 4 by the No. 1 water transfer pump 3 to physically filter solid impurities in the water, and then pumped back into the spray cleaning tower 2 by the No. 2 water transfer pump 5 for recycling.

[0017] S3: The iron poisoned resin after impurity removal enters the pretreatment device 6 through the outlet of the spray cleaning tower 2. The pretreatment liquid in the pretreatment liquid storage tank 8 is circulated into the pretreatment device 6 for pretreatment, which converts the iron oxide or iron hydroxide on the surface or in the pores of the resin into iron ions.

[0018] S4: The pretreated iron-poisoned resin enters the resin regeneration-electroplating wastewater synchronous treatment device 7 through the outlet of the pretreatment device 6.

[0019] S5: The electroplating wastewater in the electroplating wastewater storage tank 9 is filtered and impurities are removed by the filter device 10, and then it is fed into the resin regeneration-electroplating wastewater synchronous treatment device 7 by the No. 3 water transfer pump 11. The electroplating wastewater is treated by metal replacement, and the iron ions in the iron poisoning resin are desorbed at the same time.

[0020] S6: The iron-containing wastewater generated by the resin regeneration-electroplating wastewater synchronous treatment device 7 is transported to the iron-containing tailwater treatment device 13 by the No. 4 water transfer pump 12, and the iron complex is removed by electrostatic attraction and / or surface complexation.

[0021] S7: The resin desorbed from iron ions and adsorbed with heavy metal ions produced by the resin regeneration-electroplating wastewater synchronous treatment device 7 enters the resin regeneration tank 141 of the resin regeneration device 14, where it undergoes ion exchange with the chloride salt solution to achieve the desorption of heavy metal ions and the regeneration of the resin. The regenerated liquid and the regenerated resin enter the solid-liquid separation tank 142. After solid-liquid separation, the solid is fed into the regenerated resin storage tank 143, and the liquid is fed into the heavy metal resource recovery device 144. The heavy metal ions released by ion exchange are recovered by adjusting the pH or adding a precipitant.

[0022] Furthermore, the method for simultaneously regenerating the iron-poisoned resin and treating electroplating wastewater includes the following steps:

[0023] S1: The iron poisoning resin in the iron poisoning resin storage tank 1 is transported to the spray cleaning tower 2, where it is sprayed with water to wash or dissolve organic or inorganic impurities on the surface of the iron poisoning resin, thereby removing impurities from the iron poisoning resin.

[0024] S2: The spray water used in the spray cleaning tower 2 is fed into the grid 4 through the outlet by the No. 1 water transfer pump 3 for physical filtration of solid impurities in the spray water. Then the water is fed into the spray cleaning tower 2 through the No. 2 water transfer pump 5 to realize the recycling of the spray water.

[0025] S3: The iron poisoning resin after impurity removal enters the pretreatment device 6 through the outlet of the spray cleaning tower 2. The pretreatment liquid in the pretreatment liquid storage tank 8 is circulated into the pretreatment device 6 to pretreat the iron poisoning resin after impurity removal, dissolving the iron oxides or iron hydroxides deposited on the resin surface or in the pores into iron ions.

[0026] S4: The pretreated iron-poisoned resin enters the packing column of the resin regeneration-electroplating wastewater synchronous treatment device 7 through the outlet of the pretreatment device 6;

[0027] S5: After being filtered and impurities removed by the filter device 10, the electroplating wastewater in the electroplating wastewater storage tank 9 is pumped into the resin regeneration-electroplating wastewater synchronous treatment device 7 by the No. 3 water transfer pump 11. After being sprayed, it passes through the No. 1 packing column from top to bottom and then through the No. 2 packing column from bottom to top. This reduces the pressure inside the device while increasing the contact area and contact time between the electroplating wastewater and the packing. The electroplating wastewater is treated by metal replacement while the iron ions in the resin are desorbed.

[0028] S6: The iron-containing wastewater generated by the resin regeneration-electroplating wastewater synchronous treatment device 7 is transported from the outlet to the iron-containing tailwater treatment device 13 via the No. 4 water transfer pump 12. The iron complex is removed by the electrostatic attraction and / or surface complexation of the adsorbent.

[0029] S7: The resin generated by the resin regeneration-electroplating wastewater synchronous treatment device 7, which desorbs iron ions and adsorbs heavy metal ions, enters the resin regeneration tank 141 of the resin regeneration device 14 through the discharge port. It undergoes ion exchange with the chloride salt solution to achieve the desorption of adsorbed heavy metal ions and the regeneration of resin. The regenerated liquid and the regenerated resin enter the solid-liquid separation tank 142. After solid-liquid separation, the solid is fed into the regenerated resin storage tank 143, and the liquid is fed into the heavy metal resource recovery device 144. The heavy metal ions released by ion exchange are recovered by adjusting the pH or adding a precipitant.

[0030] Furthermore, in S3, the pretreatment solution is a hydrochloric acid solution with a mass concentration of 10~30 wt%.

[0031] Furthermore, in S6, the adsorbents include, but are not limited to, activated carbon, anion exchange resin, orange peel, biochar, etc.

[0032] Furthermore, in S7, the chloride salt solution is a potassium chloride solution or a sodium chloride solution.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] (1) Because most heavy metal ions (HM) can form octahedral structures with ethylenediaminetetraacetic acid (EDTA). Generally, shorter bond lengths indicate better affinity. Studies have shown that in the formed octahedral structure, heavy metal ions (such as Cu) have a higher affinity for ethylenediaminetetraacetic acid (EDTA). 2+ Ni 2+ The bond length between the O or N (HM-O bond, HM-N bond) and the corresponding Fe is longer than the bond length between the O or N at the corresponding position and Fe. 3 +The bond lengths between coordination groups (Fe-O, Fe-N) also contribute to the structural stability of Fe(III)-EDTA compared to Ni(II)-EDTA and Cu(II)-EDTA. Theoretically, electrons donated by the EDTA ligands can occupy the d and p orbitals of HM and Fe(III). According to crystal field theory, in an octahedral coordination field, the d orbitals of the central ion will split. For example, Cu... 2+ Its electronic configuration is In an octahedral field, the electron filling situation is as follows: .because The presence of electrons in the orbitals leads to the Jahn-Teller effect, causing distortion in the complex and resulting in a relative decrease in its structural stability. When using the crystal field stabilization energy (CFSE) to determine the stability of a complex, the principle is that the larger the absolute value of the CFSE, the more stable the complex. In the strong-field ligand EDTA and Fe... 3+ In the coordination process, electrons preferentially occupy the lower electron positions. Orbit. And Fe 3+ The electronic configuration is In an octahedral field, the electron filling is Fe(III)-EDTA has a lower energy level and a more stable electronic configuration. This results in a larger complexation stability constant for Fe(III)-EDTA compared to HM-EDTA. Therefore, from a thermodynamic perspective, Fe... 3+ This invention can effectively replace heavy metal ions in heavy metal complexes to form iron complexes. It utilizes the Fe present in the pretreated iron-poisoned resin. 3+ This method treats heavy metal complexes in electroplating wastewater, using hydrochloric acid solution as a pretreatment solution. Hydrochloric acid can also be used to adjust the pH value of the wastewater to achieve optimal treatment results. This method avoids waste of chemical reagents, saves costs, and achieves efficient treatment of electroplating wastewater.

[0035] (2) The present invention designs a multi-layer double-filler column in the resin regeneration-electroplating wastewater synchronous treatment device, which reduces the pressure inside the device while increasing the contact area and contact time between the electroplating wastewater and the filler, so that the iron poisoned resin and the heavy metal complex in the electroplating wastewater can fully react, thereby achieving efficient removal of electroplating wastewater and desorption of iron ions in the resin and synchronous recovery of heavy metal ions.

[0036] (3) The present invention designs an iron-containing wastewater treatment device for the iron-containing wastewater generated by the resin regeneration-electroplating wastewater synchronous treatment device. By utilizing the electrostatic adsorption and surface complexation of the adsorbent filled in the iron-containing wastewater treatment device, the electroplating wastewater can be discharged in compliance with standards.

[0037] (4) The method of the present invention can continuously realize the regeneration of iron poisoning resin and the simultaneous treatment of electroplating wastewater. It has a significant effect on the treatment of heavy metal citric acid complex. For example, the regeneration rate of iron poisoning resin with an iron content of 4% is >90%, and the heavy metal recovery rate of electroplating wastewater with a heavy metal content of 10 ppm is >90%. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the overall structure of a device for the simultaneous regeneration of iron-poisoned resin and the treatment of electroplating wastewater. In the diagram: 1. Iron-poisoned resin storage tank; 2. Spray cleaning tower; 3. No. 1 water transfer pump; 4. Bar screen; 5. No. 2 water transfer pump; 6. Pretreatment device; 7. Resin regeneration-electroplating wastewater simultaneous treatment device; 8. Pretreatment liquid storage tank; 9. Electroplating wastewater storage tank; 10. Filter device; 11. No. 3 water transfer pump; 12. No. 4 water transfer pump; 13. Iron-containing tailwater treatment device; 14. Resin regeneration device.

[0039] Figure 2 This is a schematic diagram of a resin regeneration-electroplating wastewater simultaneous treatment device. In the diagram: electroplating wastewater inlet device 71, pretreatment iron poisoning resin inlet 72, No. 1 packing column 73, No. 2 packing column 74, iron-containing tailwater outlet 75, No. 1 packing column outlet 76, No. 2 packing column outlet 77.

[0040] Figure 3 This is a schematic diagram showing the structural details of a resin regeneration-electroplating wastewater simultaneous treatment device. The diagram includes: electroplating wastewater inlet 711, electroplating wastewater inlet pipe 712, electroplating wastewater spray head 713, upper inlet of packing column 1 721, lower inlet of packing column 1 722, upper inlet of packing column 2 723, lower inlet of packing column 2 724, upper packing column 1 731, lower packing column 1 732, upper packing column 2 741, lower packing column 2 742, outlet pipe 751, outlet 752, check valve 753, discharge pipe 1 761, discharge port 1 762, check valve 1 763, discharge pipe 2 771, discharge port 2 772, and check valve 2 773.

[0041] Figure 4 This is a schematic diagram of the spray cleaning tower. In the diagram: iron poisoning resin inlet 21, resin conveying pipeline 22, iron poisoning resin packing device 23, deionized water spraying device 24, discharge port 25 and water outlet 26.

[0042] Figure 5This is a schematic diagram showing the structural details of a spray cleaning tower. The diagram includes: upper layer iron poisoning resin inlet 211, lower layer iron poisoning resin inlet 212, upper layer resin conveying pipe 221, lower layer resin conveying pipe 222, upper layer iron poisoning resin packing device 231, lower layer iron poisoning resin packing device 232, deionized water inlet 241, spray head 242, upper layer outlet 251, lower layer outlet 252, water outlet pipe 261, and check valve 262.

[0043] Figure 6 This is a schematic diagram of a resin regeneration device, which includes: resin regeneration tank 141, solid-liquid separation tank 142, regenerated resin storage tank 143, and heavy metal resource recovery device 144. Detailed Implementation

[0044] The technical solution of the present invention will be clearly and completely described below with reference to specific embodiments and accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] like Figure 1 As shown, the device for simultaneous regeneration of iron-poisoned resin and treatment of electroplating wastewater according to the present invention includes an iron-poisoned resin storage tank 1, a spray cleaning tower 2, a first water transfer pump 3, a grid 4, a second water transfer pump 5, a pretreatment device 6, a resin regeneration-electroplating wastewater simultaneous treatment device 7, a pretreatment liquid storage tank 8, an electroplating wastewater storage tank 9, a filtration device 10, a third water transfer pump 11, a fourth water transfer pump 12, an iron-containing tailwater treatment device 13, and a resin regeneration device 14; the iron-poisoned resin storage tank 1 is connected to the spray cleaning tower 2, the outlet of the spray cleaning tower 2 is connected to the grid 4 via the first water transfer pump 3, and the outlet of the grid 4 is connected to the second water transfer pump 5. The conveying pump 5 is connected to the inlet of the spray cleaning tower 2. The outlet of the spray cleaning tower 2 is connected to the pretreatment device 6. The outlet of the pretreatment device 6 is connected to the resin regeneration-electroplating wastewater synchronous treatment device 7. The pretreatment liquid storage tank 8 is connected to the pretreatment device 6. The electroplating wastewater storage tank 9 is connected to the filter device 10. The filter device 10 is connected to the inlet of the resin regeneration-electroplating wastewater synchronous treatment device 7 via the No. 3 water conveying pump 11. The outlet of the resin regeneration-electroplating wastewater synchronous treatment device 7 is connected to the iron-containing tailwater treatment device 13 via the No. 4 water conveying pump 12. The outlet of the resin regeneration-electroplating wastewater synchronous treatment device 7 is connected to the resin regeneration device 14.

[0046] like Figure 2As shown, the resin regeneration-electroplating wastewater simultaneous treatment device 7 includes an electroplating wastewater inlet device 71, a pretreatment iron-poisoned resin inlet 72, a first packing column 73, a second packing column 74, an iron-containing wastewater outlet 75, a first packing column outlet 76, and a second packing column outlet 77. The electroplating wastewater inlet device 71 is connected to the first packing column 73, the pretreatment iron-poisoned resin inlet 72 is connected to the first packing column 73 and the second packing column 74, the bottoms of the first packing column 73 and the second packing column 74 are connected, the second packing column 74 is connected to the iron-containing wastewater outlet 75, the first packing column outlet 76 is connected to the first packing column 73, and the second packing column outlet 77 is connected to the second packing column 74.

[0047] like Figure 3 As shown, the electroplating wastewater inlet device 71 includes an electroplating wastewater inlet 711, an electroplating wastewater inlet pipe 712, and an electroplating wastewater spray head 713. The pretreatment iron poisoning resin inlet 72 includes an upper inlet 721 of the first packing column, a lower inlet 722 of the first packing column, an upper inlet 723 of the second packing column, and a lower inlet 724 of the second packing column. The first packing column 73 includes an upper packing column. The packing column 731 and the first lower packing column 732 are included. The second packing column 74 includes the second upper packing column 741 and the second lower packing column 742. The iron-containing tailwater outlet 75 includes an outlet pipe 751, an outlet 752, and a check valve 753. The discharge port 76 of the first packing column includes a first discharge pipe 761, a first discharge port 762, and a first check valve 763. The discharge port 77 of the second packing column includes... Includes a second discharge pipe 771, a second discharge port 772, and a second check valve 773. The electroplating wastewater inlet 711 is connected to the electroplating wastewater inlet pipe 712, and the electroplating wastewater inlet pipe 712 is connected to the electroplating wastewater spray head 713. The upper inlet 721 of the first packing column is connected to the first upper packing column 731, and the lower inlet 722 of the first packing column is connected to the first lower packing column 732. The upper layer of the second packing column... The feed inlet 723 is connected to the second upper packing column 741, the lower feed inlet 724 of the second packing column is connected to the second lower packing column 742, the water outlet pipe 751 is connected to the water outlet 752 and is equipped with a check valve 753, the first discharge pipe 761 is connected to the first discharge outlet 762 and is equipped with a first check valve 763, and the second discharge pipe 771 is connected to the second discharge outlet 772 and is equipped with a second check valve 773.

[0048] like Figure 4As shown, the spray cleaning tower 2 includes an iron poisoning resin inlet 21, a resin conveying pipe 22, an iron poisoning resin packing device 23, a deionized water spraying device 24, an outlet 25, and a water outlet 26. The iron poisoning resin inlet 21 is fixedly connected to the resin conveying pipe 22, the resin conveying pipe 22 is fixedly connected to the top of the iron poisoning resin packing device 23, the outlet 25 is located at the bottom of the iron poisoning resin packing device 23, the deionized water spraying device 24 is located at the top of the spray cleaning tower 2, and the water outlet 26 is located at the bottom of the spray cleaning tower 2.

[0049] like Figure 5 As shown, the iron-poisoning resin inlet 21 includes an upper iron-poisoning resin inlet 211 and a lower iron-poisoning resin inlet 212; the resin conveying pipe 22 includes an upper resin conveying pipe 221 and a lower resin conveying pipe 222; the iron-poisoning resin packing device 23 includes an upper iron-poisoning resin packing device 231 and a lower iron-poisoning resin packing device 232; the deionized water spraying device 24 includes a deionized water inlet 241 and a spray head 242; the outlet 25 includes an upper outlet 251 and a lower outlet 252; and the water outlet 26 includes a water outlet pipe 212. 61 and check valve 262; the upper layer inlet 211 and lower layer inlet 212 of the iron poisoning resin are respectively connected to the upper layer iron poisoning resin packing device 231 and the lower layer iron poisoning resin packing device 232 via the upper layer resin conveying pipe 221 and the lower layer resin conveying pipe 222, the deionized water inlet 241 is connected to the spray head 242, the upper layer outlet 251 and the lower layer outlet 252 are respectively located at the bottom of the upper layer iron poisoning resin packing device 231 and the lower layer iron poisoning resin packing device 232, and a check valve 262 is provided on the water outlet pipe 261.

[0050] like Figure 6 As shown, the resin regeneration device 14 includes a resin regeneration tank 141, a solid-liquid separation tank 142, a regenerated resin storage tank 143, and a heavy metal resource recovery device 144. One end of the resin regeneration tank 141 is connected to the outlet of the resin regeneration-electroplating wastewater synchronous treatment device 7, which is connected to the inlet of the resin regeneration tank 141. The outlet of the resin regeneration tank 141 is connected to the inlet of the solid-liquid separation tank 142. The solid outlet of the solid-liquid separation tank 142 is connected to the regenerated resin storage tank 143, and the liquid outlet of the solid-liquid separation tank 142 is connected to the heavy metal resource recovery device 144.

[0051] The method for simultaneous regeneration of iron-poisoned resin and treatment of electroplating wastewater according to the present invention, using the above-mentioned apparatus, includes the following steps:

[0052] S1: The iron poisoning resin in the iron poisoning resin storage tank 1 is transported to the spray cleaning tower 2 for impurity removal treatment;

[0053] S2: The water effluent from the spray cleaning tower 2 is fed into the screen 4 by the No. 1 water transfer pump 3 to physically filter solid impurities in the water, and then pumped back into the spray cleaning tower 2 by the No. 2 water transfer pump 5 for recycling.

[0054] S3: The iron poisoned resin after impurity removal enters the pretreatment device 6 through the outlet of the spray cleaning tower 2. The pretreatment liquid in the pretreatment liquid storage tank 8 is circulated into the pretreatment device 6 for pretreatment, which converts the iron oxide or iron hydroxide on the surface or in the pores of the resin into iron ions.

[0055] S4: The pretreated iron-poisoned resin enters the resin regeneration-electroplating wastewater synchronous treatment device 7 through the outlet of the pretreatment device 6.

[0056] S5: The electroplating wastewater in the electroplating wastewater storage tank 9 is filtered and impurities are removed by the filter device 10, and then it is fed into the resin regeneration-electroplating wastewater synchronous treatment device 7 by the No. 3 water transfer pump 11. The electroplating wastewater is treated by metal replacement, and the iron ions in the iron poisoning resin are desorbed at the same time.

[0057] S6: The iron-containing wastewater generated by the resin regeneration-electroplating wastewater synchronous treatment device 7 is transported to the iron-containing tailwater treatment device 13 by the No. 4 water transfer pump 12, and the iron complex is removed by electrostatic attraction and / or surface complexation.

[0058] S7: The resin desorbed from iron ions and adsorbed with heavy metal ions produced by the resin regeneration-electroplating wastewater synchronous treatment device 7 enters the resin regeneration tank 141 of the resin regeneration device 14, where it undergoes ion exchange with the chloride salt solution to achieve the desorption of heavy metal ions and the regeneration of the resin. The regenerated liquid and the regenerated resin enter the solid-liquid separation tank 142. After solid-liquid separation, the solid is fed into the regenerated resin storage tank 143, and the liquid is fed into the heavy metal resource recovery device 144.

[0059] More specifically, the method for simultaneously regenerating iron-poisoned resin and treating electroplating wastewater includes the following steps:

[0060] S1: The iron poisoning resin in the iron poisoning resin storage tank 1 is transported to the spray cleaning tower 2, where it is sprayed with water to wash or dissolve organic or inorganic impurities on the surface of the iron poisoning resin, thereby removing impurities from the iron poisoning resin.

[0061] S2: The spray water used in the spray cleaning tower 2 is fed into the grid 4 through the outlet by the No. 1 water transfer pump 3 for physical filtration of solid impurities in the spray water. Then the water is fed into the spray cleaning tower 2 through the No. 2 water transfer pump 5 to realize the recycling of the spray water.

[0062] S3: The iron poisoning resin after impurity removal enters the pretreatment device 6 through the outlet of the spray cleaning tower 2. The pretreatment liquid in the pretreatment liquid storage tank 8 is circulated into the pretreatment device 6 to pretreat the iron poisoning resin after impurity removal, dissolving the iron oxides or iron hydroxides deposited on the resin surface or in the pores into iron ions.

[0063] S4: The pretreated iron-poisoned resin enters the packing column of the resin regeneration-electroplating wastewater synchronous treatment device 7 through the outlet of the pretreatment device 6;

[0064] S5: After being filtered and impurities removed by the filter device 10, the electroplating wastewater in the electroplating wastewater storage tank 9 is pumped into the resin regeneration-electroplating wastewater synchronous treatment device 7 by the No. 3 water transfer pump 11. After being sprayed, it passes through the No. 1 packing column from top to bottom and then through the No. 2 packing column from bottom to top. This reduces the pressure inside the device while increasing the contact area and contact time between the electroplating wastewater and the packing. The electroplating wastewater is treated by metal replacement, and the iron ions in the iron poisoned resin are desorbed at the same time.

[0065] S6: The iron-containing wastewater generated by the resin regeneration-electroplating wastewater synchronous treatment device 7 is transported to the iron-containing tailwater treatment device 13 by the No. 4 water transfer pump 12, and the iron complex is removed by the electrostatic attraction and / or surface complexation of the adsorbent.

[0066] S7: The resin desorbed from iron ions and adsorbed from heavy metal ions produced by the resin regeneration-electroplating wastewater synchronous treatment device 7 enters the resin regeneration tank 141 of the resin regeneration device 14, where it undergoes ion exchange with sodium chloride solution to achieve desorption of heavy metal ions and regeneration of the resin. The regenerated liquid and the regenerated resin enter the solid-liquid separation tank 142. After solid-liquid separation, the solid is fed into the regenerated resin storage tank 143, and the liquid is fed into the heavy metal resource recovery device 144.

[0067] Example 1

[0068] A method for simultaneously regenerating iron-poisoned resin and treating electroplating wastewater includes the following steps:

[0069] S1: The iron poisoning resin in the iron poisoning resin storage tank 1 is transported through the upper iron poisoning resin inlet 211 and the lower iron poisoning resin inlet 212 to the upper iron poisoning resin packing device 231 and the lower iron poisoning resin packing device 222 in the spray cleaning tower 2 via the upper resin conveying pipe 221 and the lower iron poisoning resin packing device 232. Deionized water is sprayed out from the spray head 242 through the deionized water inlet 241 to rinse or dissolve the organic or inorganic impurities on the surface of the iron poisoning resin, thereby achieving the removal of impurities from the iron poisoning resin.

[0070] S2: Open the check valve 262, and the water in the spray cleaning tower 2 is fed into the grid 4 by the No. 1 water transfer pump 3 through the water outlet pipe 261 for physical filtration of solid impurities in the water. Then the water is recycled back to the spray cleaning tower 2 by the No. 2 water transfer pump 5 through the deionized water inlet 241 to realize the recycling of deionized water.

[0071] S3: The iron poisoning resin after impurity removal enters the pretreatment device 6 through the upper discharge port 251 and the lower discharge port 252 of the spray cleaning tower 2. The pretreatment liquid in the pretreatment liquid storage tank 8 is circulated into the pretreatment device 6 to pretreat the iron poisoning resin after impurity removal, dissolving the iron oxides or iron hydroxides deposited on the resin surface or in the pores into iron ions.

[0072] S4: The pretreated iron-poisoned resin enters the resin regeneration-electroplating wastewater synchronous treatment device 7 through the outlet of the pretreatment device 6 via the upper inlet 721 of the first packing column, the lower inlet 722 of the first packing column, the upper inlet 723 of the second packing column, and the lower inlet 724 of the second packing column into the upper packing column 731 of the first packing column, the lower packing column 732 of the first packing column, the upper packing column 741 of the second packing column, and the lower packing column 742 of the second packing column;

[0073] S5: After being filtered and impurities removed by the filter device 10, the electroplating wastewater in the electroplating wastewater storage tank 9 is sprayed out from the electroplating wastewater inlet 711 through the electroplating wastewater inlet pipe 712 by the No. 3 water transfer pump 11 and sprayed out from the electroplating wastewater spray head 713. The electroplating wastewater passes through the No. 1 upper packing column 731 and the No. 1 lower packing column 732 from top to bottom, and then passes through the No. 2 lower packing column 742 and the No. 2 upper packing column 741 from bottom to top. While reducing the pressure inside the device, the contact area and contact time between the electroplating wastewater and the packing are increased. The electroplating wastewater is treated by metal replacement, and the iron ions in the iron poisoning resin are desorbed at the same time.

[0074] S6: Open the check valve 753. The iron-containing wastewater generated by the resin regeneration-electroplating wastewater synchronous treatment device 7 is transported from the outlet pipe 751 through the outlet 752 and through the No. 4 water transfer pump 12 to the iron-containing tailwater treatment device 13. The iron complex is removed by the electrostatic attraction and / or surface complexation of the adsorbent.

[0075] S7: Open check valve 763 and check valve 773. The resin desorbed iron ions and adsorbed heavy metal ions generated by the resin regeneration-electroplating wastewater synchronous treatment device 7 enter the resin regeneration tank 141 of the resin regeneration device 14 through outlet 762 and outlet 772. It undergoes ion exchange with the chloride solution to achieve desorption of heavy metal ions and regeneration of resin. The regenerated liquid and the regenerated resin enter the solid-liquid separation tank 142. After solid-liquid separation, the solid is sent to the regenerated resin storage tank 143 and the liquid is sent to the heavy metal resource recovery device 144. The heavy metal ions released by ion exchange are recovered by adjusting the pH or adding a precipitant.

[0076] This embodiment selects a product containing Fe. 3+ The macroporous cation exchange resin D001 (a styrene-divinylbenzene copolymer with sulfonic acid groups (-SO3H)) is a representative of iron-poisoning resins. Iron-poisoning resins with different iron contents are shown in Table 1.

[0077] Iron-poisoning resins with different iron contents (0.3 g / L) were added to the device for simultaneous regeneration of iron-poisoning resin and treatment of electroplating wastewater of the present invention. The spray water flow rate in the spray cleaning tower was controlled at 0.1 L / min. The pretreatment solution was a 10 wt.% hydrochloric acid solution, the chloride solution was a sodium chloride solution, and the iron removal adsorbents were macroporous cation exchange resin and macroporous anion exchange resin. The heavy metal ions released by ion exchange were recovered by adjusting the pH. The initial concentration of electroplating wastewater (calculated as heavy metal ions) was 10 ppm. The electroplating wastewater was a complex wastewater containing citric acid ligands, and the heavy metals were Cu, Ni, Zn, Pb, and Hg. The pretreated resin was loaded into the resin regeneration-electroplating wastewater simultaneous treatment device. The initial pH of the electroplating wastewater was about 5.0, the wastewater pumping rate was 0.01 L / min, and the wastewater retention time was 30 min. The wastewater treated by the iron-containing wastewater treatment device, the wastewater treated by the heavy metal resource recovery device, and the regenerated resin were collected. The content of different metal elements in the wastewater was tested, and the heavy metal removal rate, heavy metal recovery efficiency, and resin regeneration rate were calculated. The results are shown in Table 2.

[0078] Table 1

[0079] Iron content (mass fraction) in iron-poisoning resin 2.1328% 4.2107% 8.3598% serial number Iron poisoning resin 1 Iron poisoning resin 2 Iron poisoning resin 3

[0080] Table 2

[0081] Regeneration efficiency of iron-poisoned resin 1 (%) Regeneration efficiency of iron-poisoned resin 2 (%) Regeneration efficiency (%) of iron-poisoned resin 3 Heavy metal removal rate (%) Heavy metal recovery efficiency (%) Nickel-containing wastewater >95 >90 >85 >99.5 >90 Copper-containing wastewater >95 >90 >85 >99.5 >90 Zinc-containing wastewater >95 >90 >85 >99.5 >90 Lead-containing wastewater >95 >90 >85 >99.5 >90 Mercury-containing wastewater >95 >90 >85 >99.5 >90

[0082] The working principle of this invention is as follows: First, the iron-poisoned resin after impurity removal is pretreated with hydrochloric acid solution to dissolve the iron oxides or iron hydroxides deposited on the surface or in the pores. At this point, the iron in the iron-poisoned resin exists in the form of iron ions. Based on the principle of ligand field theory, Fe(III)-EDTA is more stable in structure than HM-EDTA (such as Ni(II)-EDTA and Cu(II)-EDTA, etc.), which makes Fe(III)-EDTA have a larger complexation stability constant than HM-EDTA. Therefore, from a thermodynamic perspective, Fe... 3+ This method can effectively replace heavy metal ions in heavy metal complexes to form iron complexes, thereby achieving effective removal of heavy metal complexes from electroplating wastewater. In this process, iron in the iron-poisoned resin is released into the solution in the form of complexes, and the resin functional groups are occupied by heavy metal ions. Using sodium chloride solution as the regeneration liquid, sodium ions replace the heavy metal ions on the resin functional groups through ion exchange, achieving resin regeneration while releasing heavy metal ions into the solution. At this point, a precipitant or by adjusting the solution to alkalinity can be used to capture and recover the heavy metal ions. The treated electroplating wastewater is converted into wastewater containing iron complexes. The iron complexes are removed through electrostatic attraction and / or surface complexation by common adsorbents (such as activated carbon, anion exchange resins, orange peel, biochar, etc.), ensuring that the effluent ultimately meets discharge standards.

[0083] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0084] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for simultaneous regeneration of iron-poisoned resin and treatment of electroplating wastewater, characterized in that, The system includes an iron-poisoned resin storage tank (1), a spray cleaning tower (2), a first water transfer pump (3), a grid (4), a second water transfer pump (5), a pretreatment device (6), a resin regeneration-electroplating wastewater simultaneous treatment device (7), a pretreatment liquid storage tank (8), an electroplating wastewater storage tank (9), a filter device (10), a third water transfer pump (11), a fourth water transfer pump (12), an iron-containing tailwater treatment device (13), and a resin regeneration device (14); the iron-poisoned resin storage tank (1) is connected to the spray cleaning tower (2), and the spray cleaning tower ( 2) The outlet is connected to the grid (4) via the No. 1 water transfer pump (3). The outlet of the grid (4) is connected to the inlet of the spray cleaning tower (2) via the No. 2 water transfer pump (5). The outlet of the spray cleaning tower (2) is connected to the pretreatment device (6). The outlet of the pretreatment device (6) is connected to the resin regeneration-electroplating wastewater synchronous treatment device (7). The pretreatment liquid storage tank (8) is connected to the pretreatment device (6). The electroplating wastewater storage tank (9) is connected to the filter device (10). The filter device (10) is connected to the resin regeneration-electroplating wastewater storage tank (9) via the No. 3 water transfer pump (11). The inlet of the synchronous treatment device (7) is connected, and the outlet of the resin regeneration-electroplating wastewater synchronous treatment device (7) is connected to the iron-containing tailwater treatment device (13) via the No. 4 water transfer pump (12). The outlet of the resin regeneration-electroplating wastewater synchronous treatment device (7) is connected to the resin regeneration device (14). The resin regeneration-electroplating wastewater synchronous treatment device (7) includes an electroplating wastewater inlet device (71), a pretreatment iron-poisoned resin inlet (72), a No. 1 packing column (73), a No. 2 packing column (74), an iron-containing tailwater outlet (75), and a No. 1 packing column outlet. The outlet (76) and the outlet (77) of the second packing column are connected; the electroplating wastewater inlet device (71) is connected to the first packing column (73), the pretreatment iron poisoning resin inlet (72) is connected to the first packing column (73) and the second packing column (74), the bottoms of the first packing column (73) and the second packing column (74) are connected, the second packing column (74) is connected to the iron-containing tailwater outlet (75), the outlet (76) of the first packing column is connected to the first packing column (73), and the outlet (77) of the second packing column is connected to the second packing column (74);The electroplating wastewater inlet device (71) includes an electroplating wastewater inlet (711), an electroplating wastewater inlet pipe (712), and an electroplating wastewater spray head (713). The pretreatment iron poisoning resin inlet (72) includes an upper inlet (721) of the first packing column, a lower inlet (722) of the first packing column, an upper inlet (723) of the second packing column, and a lower inlet (724) of the second packing column. The first packing column (73) includes an upper packing column (731). The first lower packing column (732) and the second packing column (74) include the second upper packing column (741) and the second lower packing column (742). The iron-containing tailwater outlet (75) includes an outlet pipe (751), an outlet (752), and a check valve (753). The first packing column outlet (76) includes a first discharge pipe (761), a first discharge outlet (762), and a first check valve (763). The second packing column outlet (77) includes two... The system includes a discharge pipe (771), a discharge port (772), and a check valve (773). The electroplating wastewater inlet (711) is connected to the electroplating wastewater inlet pipe (712), which is connected to the electroplating wastewater spray head (713). The upper inlet (721) of the first packing column is connected to the upper packing column (731), and the lower inlet (722) of the first packing column is connected to the lower packing column (732). The upper inlet of the second packing column... (723) The connection includes a second upper packing column (741), a second lower packing column inlet (724) connected to a second lower packing column (742), a water outlet pipe (751) connected to a water outlet (752) and equipped with a check valve (753), a first discharge pipe (761) connected to a first discharge outlet (762) and equipped with a first check valve (763), and a second discharge pipe (771) connected to a second discharge outlet (772) and equipped with a second check valve (773).

2. The apparatus according to claim 1, characterized in that, The spray cleaning tower (2) includes an iron poisoning resin inlet (21), a resin conveying pipe (22), an iron poisoning resin packing device (23), a deionized water spraying device (24), a discharge port (25), and a water outlet (26). The iron poisoning resin inlet (21) is fixedly connected to the resin conveying pipe (22), the resin conveying pipe (22) is fixedly connected to the top of the iron poisoning resin packing device (23), the discharge port (25) is located at the bottom of the iron poisoning resin packing device (23), the deionized water spraying device (24) is located at the top of the spray cleaning tower (2), and the water outlet (26) is located at the bottom of the spray cleaning tower (2).

3. The apparatus according to claim 2, characterized in that, The iron poisoning resin inlet (21) includes an upper iron poisoning resin inlet (211) and a lower iron poisoning resin inlet (212); the resin conveying pipe (22) includes an upper resin conveying pipe (221) and a lower resin conveying pipe (222); the iron poisoning resin packing device (23) includes an upper iron poisoning resin packing device (231) and a lower iron poisoning resin packing device (232); the deionized water spraying device (24) includes a deionized water inlet (241) and a spray head (242); the outlet (25) includes an upper outlet (251) and a lower outlet (252); and the water outlet (26) includes a water outlet pipe (26). 1) and check valve (262); the upper layer inlet (211) and lower layer inlet (212) of the iron poisoning resin are connected to the upper layer iron poisoning resin packing device (231) and the lower layer iron poisoning resin packing device (232) respectively via the upper layer resin conveying pipe (221) and the lower layer resin conveying pipe (222), the deionized water inlet (241) is connected to the spray head (242), the upper layer outlet (251) and the lower layer outlet (252) are located at the bottom of the upper layer iron poisoning resin packing device (231) and the lower layer iron poisoning resin packing device (232) respectively, and a check valve (262) is provided on the water outlet pipe (261).

4. The apparatus according to claim 1, characterized in that, The resin regeneration device (14) includes a resin regeneration tank (141), a solid-liquid separation tank (142), a regenerated resin storage tank (143), and a heavy metal resource recovery device (144). One end of the resin regeneration tank (141) is connected to the outlet of the resin regeneration-electroplating wastewater synchronous treatment device (7), and the other end is connected to the inlet of the resin regeneration tank (141). The outlet of the resin regeneration tank (141) is connected to the inlet of the solid-liquid separation tank (142). The solid outlet of the solid-liquid separation tank (142) is connected to the regenerated resin storage tank (143), and the liquid outlet of the solid-liquid separation tank (142) is connected to the heavy metal resource recovery device (144).

5. A method for simultaneous regeneration of iron-poisoned resin and treatment of electroplating wastewater, characterized in that, The apparatus according to any one of claims 1 to 4 comprises the following steps: S1: The iron poisoning resin in the iron poisoning resin storage tank (1) is transported to the spray cleaning tower (2) for impurity removal treatment; S2: The water effluent from the spray cleaning tower (2) is fed into the grid (4) by the No. 1 water transfer pump (3) to physically filter the solid impurities in the water, and then pumped into the spray cleaning tower (2) by the No. 2 water transfer pump (5) for recycling. S3: The iron poisoned resin after impurity removal enters the pretreatment device (6) through the outlet of the spray cleaning tower (2). The pretreatment liquid in the pretreatment liquid storage tank (8) is circulated into the pretreatment device (6) for pretreatment, which converts the iron oxide or iron hydroxide on the resin surface or in the pores into iron ions. S4: The pretreated iron-poisoned resin enters the resin regeneration-electroplating wastewater synchronous treatment device (7) through the outlet of the pretreatment device (6); S5: The electroplating wastewater in the electroplating wastewater storage tank (9) is filtered and impurities are removed by the filter device (10), and then it is fed into the resin regeneration-electroplating wastewater synchronous treatment device (7) by the No. 3 water transfer pump (11). The electroplating wastewater is treated by metal replacement while the iron ions in the iron poisoning resin are desorbed. S6: The iron-containing wastewater generated by the resin regeneration-electroplating wastewater synchronous treatment device (7) is transported to the iron-containing tailwater treatment device (13) by the No. 4 water transfer pump (12), and the iron complex is removed by electrostatic attraction and / or surface complexation. S7: The resin that has desorbed iron ions and adsorbed heavy metal ions produced by the resin regeneration-electroplating wastewater synchronous treatment device (7) enters the resin regeneration tank (141) of the resin regeneration device (14), where it undergoes ion exchange with the chloride salt solution to achieve the desorption of heavy metal ions and the regeneration of the resin. The regenerated liquid and the regenerated resin enter the solid-liquid separation tank (142). After solid-liquid separation, the solid is fed into the regenerated resin storage tank (143), and the liquid is fed into the heavy metal resource recovery device (144). The heavy metal ions released by ion exchange are recovered by adjusting the pH or adding a precipitant.

6. The method according to claim 5, characterized in that, Includes the following steps: S1: The iron poisoning resin in the iron poisoning resin storage tank (1) is transported to the spray cleaning tower (2), where it is sprayed with water to wash or dissolve the organic or inorganic impurities on the surface of the iron poisoning resin, thereby removing impurities from the iron poisoning resin. S2: The spray water used in the spray cleaning tower (2) is fed into the grid (4) by the No. 1 water transfer pump (3) through the outlet to physically filter the solid impurities in the spray water. Then the water is fed into the spray cleaning tower (2) by the No. 2 water transfer pump (5) to realize the recycling of the spray water. S3: The iron poisoned resin after impurity removal enters the pretreatment device (6) through the outlet of the spray cleaning tower (2). The pretreatment liquid in the pretreatment liquid storage tank (8) is circulated into the pretreatment device (6) to pretreat the iron poisoned resin after impurity removal, dissolving the iron oxides or iron hydroxides deposited on the resin surface or in the pores into iron ions. S4: The pretreated iron-poisoned resin enters the packing column of the resin regeneration-electroplating wastewater synchronous treatment device (7) through the outlet of the pretreatment device (6); S5: The electroplating wastewater in the electroplating wastewater storage tank (9) is filtered and impurities removed by the filter device (10), and then pumped into the resin regeneration-electroplating wastewater synchronous treatment device (7) by the No. 3 water transfer pump (11). After being sprayed, it passes through the No. 1 packing column from top to bottom and then through the No. 2 packing column from bottom to top. This reduces the pressure inside the device while increasing the contact area and contact time between the electroplating wastewater and the packing. The electroplating wastewater is treated by metal replacement while the iron ions in the iron poisoning resin are desorbed. S6: The iron-containing wastewater generated by the resin regeneration-electroplating wastewater synchronous treatment device (7) is transported from the outlet to the iron-containing tailwater treatment device (13) via the No. 4 water transfer pump (12), and the iron complex is removed by the electrostatic attraction and / or surface complexation of the adsorbent. S7: The resin generated by the resin regeneration-electroplating wastewater synchronous treatment device (7) and the resin that has desorbed iron ions and adsorbed heavy metal ions enter the resin regeneration tank (141) of the resin regeneration device (14) through the discharge port. It undergoes ion exchange with the chloride salt solution to achieve the desorption of adsorbed heavy metal ions and the regeneration of the resin. The regenerated liquid and the regenerated resin enter the solid-liquid separation tank (142). After solid-liquid separation, the solid is fed into the regenerated resin storage tank (143), and the liquid is fed into the heavy metal resource recovery device (144). The heavy metal ions released by ion exchange are recovered by adjusting the pH or adding a precipitant.

7. The method according to claim 5 or 6, characterized in that, In S3, the pretreatment solution is hydrochloric acid solution with a mass concentration of 10~30 wt%; in S6, the adsorbent is activated carbon, anion exchange resin, orange peel or biochar.

8. The method according to claim 5 or 6, characterized in that, In S7, the chloride salt solution is either a potassium chloride solution or a sodium chloride solution.

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