A method and apparatus system for electroplating wastewater treatment

Abstract

This invention discloses a method for treating electroplating wastewater in the field of wastewater treatment technology. The specific steps are as follows: Step 1: Pre-treat the micro-electrolysis packing material and test the electroplating wastewater to be treated, followed by pre-treatment; Step 2: Add the micro-electrolysis packing material from Step 1 to the pre-treated electroplating wastewater for micro-electrolysis treatment; Step 3: After micro-electrolysis, activate the micro-electrolysis packing material; Step 4: Adjust the pH value of the electroplating wastewater from Step 3, perform flocculation and sedimentation, clean the precipitate, and the supernatant is the treated water. This invention not only effectively removes harmful substances from electroplating wastewater through micro-electrolysis treatment, improving treatment efficiency, but the device can also be recycled, reducing treatment costs. Furthermore, it does not use chemical agents, avoiding secondary pollution.

Description

Technical Field

[0001] This invention belongs to the field of wastewater treatment technology, specifically a method and apparatus system for treating electroplating wastewater. Background Technology

[0002] Electroplating wastewater refers to wastewater containing harmful substances such as metal ions and cyanides generated in the electroplating industry. Substances such as acids, alkalis, solvents, and chemicals used in the electroplating process, as well as detached deposits and wastewater from rinsing, all contribute to electroplating wastewater. Electroplating wastewater is characterized by its toxicity, harmfulness, and difficulty in treatment, containing heavy metals and cyanides—substances harmful to the environment and human health. Improper treatment can cause serious pollution and damage to the environment. To protect the environment and avoid potential health risks, effective treatment and management of electroplating wastewater are essential.

[0003] Currently, traditional methods for treating electroplating wastewater both domestically and internationally mainly include biological, physical, and chemical methods. Methods for treating heavy metal ions in electroplating wastewater primarily include physical adsorption, alkali precipitation, ion exchange, and biological transformation. Thorough treatment of electroplating wastewater usually requires a combination of methods. Primary treatment involves removing large amounts of suspended solids and colored silt through sedimentation and clarification. Then, various treatment technologies such as chemical oxidation, advanced oxidation, and biological treatment are employed to ultimately bring the water quality up to discharge standards or make it reusable.

[0004] For example, Chinese patent publication number CN112624473B discloses an electroplating wastewater treatment device, including a separation mechanism, a water inlet mechanism, a scraping mechanism, a water storage mechanism, and an evaporation mechanism. The water inlet mechanism is located at the bottom of the separation mechanism, the scraping mechanism is located at the top of the separation mechanism, the water storage mechanism is fluidly connected to the separation mechanism, the evaporation mechanism is fluidly connected to the separation mechanism, and the evaporation mechanism is fluidly connected to the water storage mechanism. This invention, through the cooperation of the separation mechanism, the water inlet mechanism, and the scraping mechanism, enables the device to work continuously for a long time, and the evaporation mechanism can further separate wastewater that has not been completely separated by the separation mechanism.

[0005] However, in practical applications, some electroplating wastewater treatment technologies require a large energy supply, such as electrolysis. Furthermore, secondary pollutants may be generated during the treatment process; for example, ozone generation may release toxic gases. Therefore, this invention proposes a method and apparatus system for treating electroplating wastewater to solve the above problems. Summary of the Invention

[0006] This invention proposes a method and apparatus system for treating electroplating wastewater. It can effectively remove harmful substances from electroplating wastewater through micro-electrolysis, thereby improving treatment efficiency. The apparatus can also be recycled, reducing treatment costs. Furthermore, it does not use chemical agents, thus avoiding secondary pollution.

[0007] To achieve the above objectives, the technical solution of the present invention is as follows: A method for treating electroplating wastewater, comprising the following steps:

[0008] Step 1: Test the electroplating wastewater to be treated and perform pretreatment.

[0009] Step 2: Add the micro-electrolysis filler from Step 1 to the pretreated electroplating wastewater for micro-electrolysis treatment.

[0010] Step 3: After micro-electrolysis is completed, the micro-electrolysis filler is activated.

[0011] Step 4: Adjust the pH value of the electroplating wastewater from Step 3, perform flocculation and sedimentation, clean up the sediment, and the supernatant is the treated water.

[0012] The above-mentioned scheme achieves the following beneficial effects: wastewater treatment is realized through the electric field and redox reaction generated by micro-electrolysis. High concentrations of active substances, such as bubbles and metal ions, are formed on the surface of the micro-electrodes. These substances possess oxidation, reduction, electrolysis, and electrothermal effects, effectively degrading organic matter and removing heavy metals and other wastewater pollutants. The active material of the micro-electrolysis packing provides a larger surface area and contact points, increasing the contact opportunities between wastewater and active substances, thereby improving the treatment effect.

[0013] Step 1: Before micro-electrolysis, the electroplating wastewater needs to be pretreated. This includes analyzing the properties and composition of the wastewater to determine the appropriate subsequent treatment method and performing necessary pretreatment procedures.

[0014] Step Two: The pretreated electroplating wastewater is fed into the micro-electrolysis equipment along with the micro-electrolysis filler for further treatment. Micro-electrolysis refers to the process of generating an electric field and producing a redox reaction in a micro-gap using the principle of electrolysis. The micro-electrolysis filler, as an active material, can provide a larger surface area and contact points, increasing electrolysis efficiency and effectiveness.

[0015] Step 3: After micro-electrolysis is completed, the micro-electrolysis packing is activated. Activation treatment can be performed through cleaning, recycling, or regeneration to restore the activity and function of the packing, extend its service life, and improve the treatment effect.

[0016] Step 4: Post-treatment of the activated electroplating wastewater. This includes adjusting the pH value of the wastewater and adding chemical agents to achieve optimal sedimentation and flocculation effects. Sediment can be removed through sedimentation or filtration; the supernatant is the treated water, meeting certain environmental discharge standards.

[0017] Micro-electrolysis technology can effectively degrade organic matter in wastewater, breaking it down into harmless substances and reducing environmental pollution. Micro-electrolysis can also convert heavy metal ions in wastewater into precipitates that settle or precipitate, significantly reducing the concentration of heavy metals in the wastewater. The water quality after micro-electrolysis treatment is better, and after appropriate adjustment and post-treatment, it can meet environmental discharge standards and can be further recycled or safely discharged. Micro-electrolysis packing materials can be activated and reused, extending their service life, reducing treatment costs, and reducing the need for new packing materials.

[0018] In summary, micro-electrolysis can be used to treat electroplating wastewater, achieving efficient removal of heavy metals, improving water quality, and reducing wastewater discharge.

[0019] Furthermore, the micro-electrolysis filler in step one is activated carbon and iron powder.

[0020] Beneficial effects: Activated carbon, as a common adsorbent material, has a highly porous structure and a large specific surface area, resulting in strong adsorption capacity. It can adsorb organic matter, heavy metals, and other pollutants in wastewater, thereby purifying the wastewater. When activated carbon comes into contact with electroplating wastewater, pollutants in the wastewater are adsorbed through chemical and physical adsorption mechanisms via the pores and adsorption sites on the surface of the activated carbon.

[0021] Activated carbon has excellent adsorption properties, which can effectively adsorb organic pollutants in electroplating wastewater, reduce their content, and improve the treatment effect of wastewater. Activated carbon can also adsorb heavy metal ions in wastewater, such as copper, nickel, and chromium, reducing their concentration and thus reducing the impact on the environment. Through the adsorption of activated carbon, odors, color, and other impurities in wastewater can be effectively removed, improving water quality.

[0022] Furthermore, in step one, the pH value, color, COD and heavy metals of the electroplating wastewater to be treated are tested. The pretreatment method is to adjust the pH value of the electroplating wastewater to 2-4 with 5% sulfuric acid or 5% NaOH.

[0023] Beneficial effects: For the pretreatment of electroplating wastewater, the pH value of the electroplating wastewater is adjusted to 2-4 using 5% sulfuric acid or 5% NaOH solution because electroplating wastewater usually has high acidity or alkalinity, and adjusting it to a suitable range helps the subsequent treatment process.

[0024] Adjusting the pH value can bring the acidity or alkalinity of electroplating wastewater to a suitable range, which helps maintain the stability of water quality. Electroplating wastewater with adjusted pH is easier to process in subsequent treatment processes, such as sedimentation, filtration, and adsorption, thus improving treatment effect and efficiency. Adjusting the pH value can also prevent wastewater from causing further pollution and harm to the environment during discharge.

[0025] Furthermore, the micro-electrolysis treatment time in step two is 10-60 minutes.

[0026] Beneficial effects: Generally, the micro-electrolysis treatment time is between 10 and 60 minutes. Initially, a shorter treatment time can be tried, and then gradually adjusted through laboratory experiments or engineering practice to observe the treatment effect and optimize the treatment time.

[0027] The properties of the wastewater determine the treatment time for microelectrolysis. Different wastewaters have different compositions and concentrations, resulting in varying treatment times. The treatment time can be determined based on the target treatment effect required for the wastewater. More thorough degradation of organic pollutants or removal of heavy metals may require a longer treatment time. The type and performance of the microelectrolysis equipment, as well as other related process conditions such as current density and electrode materials, also affect the treatment time.

[0028] Furthermore, the activation treatment method for the micro-electrolysis filler in step three is as follows: after the micro-electrolysis reaction, remove the residue on the surface of the activated carbon, add iron powder, and circulate water in an environment with a pH value of 2-4 for 30 minutes.

[0029] Beneficial Effects: Activated carbon is a porous material with a large specific surface area and excellent adsorption capacity. Adding activated carbon to wastewater allows it to adsorb organic matter, heavy metal ions, and other pollutants. Iron powder undergoes a reduction reaction in water, releasing electrons. These electrons can react with oxidants in the wastewater, promoting the degradation of organic matter. Maintaining the pH of the water circulation process between 2 and 4 facilitates the degradation of organic matter. Under acidic conditions, the stability of some organic compounds decreases, making them more susceptible to reduction or oxidation. Furthermore, low pH conditions also enhance the activity of both iron powder and activated carbon.

[0030] The combination of activated carbon and iron powder utilizes their respective properties, working synergistically. Circulating water in a low pH environment for 30 minutes can accelerate the degradation of organic matter and improve treatment efficiency.

[0031] Furthermore, in step four, the pH value of the electroplating wastewater is adjusted to 8-10.

[0032] Beneficial effects: Adjusting the pH of electroplating wastewater to between 8 and 10 provides suitable environmental conditions to promote flocculation and sedimentation. Under alkaline conditions, certain ions and particulate matter in the wastewater will undergo hydrolysis, dissolution, or precipitation reactions.

[0033] An apparatus system for treating electroplating wastewater, according to the above-mentioned method for treating electroplating wastewater, the apparatus system includes a micro-electrolysis module for micro-electrolysis reaction and a cleaning module for flocculation and sedimentation, the micro-electrolysis module and the cleaning module being connected.

[0034] Furthermore, the device includes an outer shell, with a support frame fixedly connected to the outer side wall of the outer shell, and a partition fixedly connected to the inner side wall of the outer shell at one-third of the distance from the bottom wall. The partition divides the interior of the outer shell into a micro-electrolysis module and a cleaning module. The micro-electrolysis module has a first water inlet, a first sampling port and a second sampling port sequentially opened from top to bottom, and an aeration port is provided at the bottom of the micro-electrolysis module.

[0035] Beneficial Effects: This describes a method for treating wastewater using a micro-electrolysis module. In this description, pretreated electroplating wastewater is introduced into the micro-electrolysis module to initiate a micro-electrolysis reaction. The electrons generated by the micro-electrolysis reaction can react with oxidants in the wastewater, promoting the degradation of organic matter.

[0036] Adding flocculant at the inlet can cause flocculation of suspended solids in electroplating wastewater. The flocculants will be adsorbed onto activated carbon and inserts, thus achieving initial separation and fixation.

[0037] Activated carbon is a material with a large specific surface area and adsorption capacity. Pretreated activated carbon is placed above a partition; as wastewater passes through, the activated carbon adsorbs organic matter and other pollutants from the wastewater. The adsorption effect of activated carbon can effectively remove certain organic matter and color from wastewater.

[0038] Furthermore, the bottom of the cleaning module is provided with a second water inlet and a water outlet on both sides. The partition has several holes, and piston valves are fixedly connected to the holes. The first and second rod groups are arranged alternately below the partition. The first and second rod groups have the same mechanism. The first rod group includes a main rod and several crossbars. The crossbars are all fixedly connected to and communicate with the main rod. Several rods are fixedly connected to each crossbar. An activated carbon layer is fixedly connected to the outer wall of the rod. The inside of the rod is hollow and communicates with the crossbar. Several spray holes are provided on the side wall of the rod. The inside of the rod is filled with iron powder, and the spray holes are used to spray out the iron powder.

[0039] An electric telescopic rod is fixedly connected to the bottom of the main rod. The end of the electric telescopic rod away from the main rod is fixedly connected to the bottom wall of the outer shell. A powder inlet is provided on the side of the main rod away from the electric telescopic rod. A flexible hose is connected to the powder inlet. The end of the flexible hose away from the powder inlet penetrates the side wall of the outer shell and is connected to a centrifugal pump.

[0040] Beneficial effects: The electric telescopic rod adjusts the raising and lowering of the insertion rod, allowing the first and second insertion rod groups to work alternately. When the first insertion rod group rises, the second insertion rod group descends, introducing water at the second inlet. This circulates the water and washes away the adsorbed flocculants on the activated carbon layer, thereby promoting solid-liquid separation. Attached Figure Description

[0041] Figure 1 This is an isometric view of an embodiment of the electroplating wastewater treatment device of the present invention.

[0042] Figure 2 This is a cross-sectional view of an embodiment of the electroplating wastewater treatment apparatus of the present invention.

[0043] Figure 3 This is a top view of the first and second insertion rod groups in an embodiment of the electroplating wastewater treatment device of the present invention. Detailed Implementation

[0044] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0045] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "vertical", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0046] In the description of this invention, unless otherwise specified and limited, it should be noted that the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to mechanical or electrical connections, or internal connections between two components. They can be direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0047] The following detailed description illustrates the specific implementation method:

[0048] The reference numerals in the accompanying drawings include: outer casing 1, support frame 101, partition plate 102, micro-electrolysis module 2, first water inlet 201, first sampling port 202, second sampling port 203, aeration port 204, cleaning module 3, second water inlet 301, water outlet 302, first insert rod group 4, main rod 401, crossbar 402, insert rod 403, powder inlet hole 404, and second insert rod group 5.

[0049] Example 1, basically as shown in the attached document. Figure 1 The following is a method for treating electroplating wastewater, with the following specific steps:

[0050] Step 1: Test the electroplating wastewater to be treated and perform pretreatment.

[0051] Step 2: Add the micro-electrolysis filler from Step 1 to the pretreated electroplating wastewater for micro-electrolysis treatment.

[0052] Step 3: After micro-electrolysis is completed, the micro-electrolysis filler is activated.

[0053] Step 4: Adjust the pH value of the electroplating wastewater from Step 3, perform flocculation and sedimentation, clean up the precipitate, and the supernatant is the treated water.

[0054] The micro-electrolysis filler in step one is activated carbon and iron powder.

[0055] In step one, the pH value, color, COD and heavy metals of the electroplating wastewater to be treated are tested. The pretreatment method is to adjust the pH value of the electroplating wastewater to 2-4 with 5% sulfuric acid or 5% NaOH.

[0056] The micro-electrolysis treatment in step two takes 10-60 minutes.

[0057] The activation treatment method for the micro-electrolysis filler in step three is as follows: after the micro-electrolysis reaction, remove the residue on the surface of the activated carbon, add iron powder, and circulate water in an environment with a pH value of 2-4 for 30 minutes.

[0058] In step four, the pH value of the electroplating wastewater is adjusted to 8-10.

[0059] The specific implementation process is as follows: Step 1: The micro-electrolysis filler is activated carbon and iron powder. The pH value, color, COD and heavy metals of the electroplating wastewater to be treated are detected, and the pH value of the electroplating wastewater is adjusted to 2-4 with 5% sulfuric acid or 5% NaOH for pretreatment.

[0060] Step 2: Add the micro-electrolysis filler from Step 1 to the pretreated electroplating wastewater for 10-60 minutes of micro-electrolysis treatment.

[0061] Step 3: After micro-electrolysis is completed, the micro-electrolysis packing is activated and the residue on the surface of activated carbon is removed after the micro-electrolysis reaction. Iron powder is added and the mixture is circulated in water at a pH of 2-4 for 30 minutes.

[0062] Step 4: Adjust the pH value of the electroplating wastewater from Step 3 to 8-10, perform flocculation and sedimentation, clean up the precipitate, and the supernatant is the treated water.

[0063] In summary, using activated carbon to adsorb pollutants in electroplating wastewater can effectively remove color, COD (chemical oxygen demand), and heavy metals, thus improving water quality. During micro-electrolysis, the micro-electrolysis packing further degrades organic matter and heavy metal ions in the wastewater through electrochemical reactions, promoting coagulation and improving the purification effect. After micro-electrolysis, the micro-electrolysis packing is activated to remove residues on the surface of the activated carbon, maintain its adsorption capacity, and iron powder is added for synergistic reaction, further enhancing the wastewater treatment effect. The wastewater after micro-electrolysis and activation is adjusted to a suitable pH range, and then flocculation and sedimentation are carried out to aggregate suspended solids and colloidal substances in the wastewater into larger particles, facilitating subsequent sedimentation and separation.

[0064] In summary, through the above treatment steps, pollutants in the wastewater are effectively removed or transformed, and the resulting supernatant meets the discharge standards, thus effectively treating the wastewater and reducing environmental pollution.

[0065] Example 2 differs from the above examples in that: an electroplating wastewater treatment device system, according to the above-mentioned electroplating wastewater treatment method, the device system used includes a micro-electrolysis module 2 for micro-electrolysis reaction and a cleaning module 3 for flocculation and sedimentation, the micro-electrolysis module 2 and the cleaning module 3 are connected.

[0066] It also includes an outer shell 1. A support frame 101 is fixedly connected to the outer wall of the outer shell 1 by bolts. A partition 102 is fixedly connected to the inner wall of the outer shell 1 at one-third of the distance from the bottom wall by bolts. The partition 102 divides the interior of the outer shell 1 into a micro-electrolysis module 2 and a cleaning module 3. The micro-electrolysis module 2 has a first water inlet 201, a first sampling port 202 and a second sampling port 203 from top to bottom. An aeration port 204 is provided at the bottom of the micro-electrolysis module 2.

[0067] The bottom of the cleaning module 3 is provided with a second water inlet 301 and a water outlet 302 on both sides. The partition plate 102 has several holes, and piston valves are glued and fixed at the holes. The first insertion rod group 4 and the second insertion rod group 5 are arranged alternately below the partition plate 102. The first insertion rod group 4 and the second insertion rod group 5 have the same mechanism. The first insertion rod group 4 includes a main rod 401 and several cross rods 402. The cross rods 402 are all fixedly connected to the main rod 401 by bolts and are in communication. Several insertion rods 403 are fixedly connected to the cross rods 402 by bolts. An activated carbon layer is glued and fixed to the outer wall of the insertion rod 403. In this embodiment, the activated carbon layer and the fixing method are as follows: a professional adhesive (such as epoxy resin, polyurethane glue or other adhesives that can firmly adhere to the material of the insertion rod 403) is selected, and the activated carbon powder is stirred and mixed together. Stirring ensures that the activated carbon particles are evenly distributed in the adhesive. The prepared mixture is evenly coated onto the outer wall of the insert 403, ensuring the activated carbon layer adheres firmly to the insert 403. The thickness and distribution of the activated carbon layer can be adjusted as needed. The insert 403 has a hollow internal structure and is connected to the crossbar 402. Several spray holes are provided on the side walls of the insert 403, and iron powder is filled inside the insert 403. The spray holes are used to spray out the iron powder.

[0068] An electric telescopic rod is fixedly connected to the bottom of the main rod 401 by bolts. In this embodiment, the structure of the electric telescopic rod is based on the patent: Electric Telescopic Rod, Publication No. CN 113922579 A. The end of the electric telescopic rod away from the main rod 401 is fixedly connected to the inner bottom wall of the outer shell 1 by bolts. The side of the main rod 401 away from the electric telescopic rod is provided with a powder inlet hole 404. The powder inlet hole 404 is connected to a flexible hose. The end of the flexible hose away from the powder inlet hole 404 passes through the side wall of the outer shell 1 and is connected to a centrifugal pump.

[0069] The specific implementation process is as follows: Pretreated activated carbon is placed above the partition 102 inside the outer shell 1. Then, the pretreated electroplating wastewater is introduced into the outer shell 1. The micro-electrolysis module 2 is started. The micro-electrolysis time is determined according to the pH value, color, COD and BOD of the electroplating wastewater measured in advance. After the micro-electrolysis is completed, the first insertion rod group 4 is raised by the electric telescopic rod. The insertion rod 403 is inserted into the activated carbon above the partition 102 through the hole on the partition 102. The iron powder is sprayed out from the nozzle through the main rod 401 and the insertion rod 403 by the centrifugal pump. The iron powder can undergo a reduction reaction in the electroplating wastewater and release electrons. These electrons can react with the oxidant in the electroplating wastewater to promote the degradation of organic matter. Flocculant is added from the first inlet 201 to achieve the effect of flocculation and sedimentation of the electroplating wastewater. The flocculent will be adsorbed on the activated carbon and the insertion rod 403.

[0070] At this time, the first insertion rod group 4 is lowered by the electric telescopic rod, while the second insertion rod group 5 is raised. After the first insertion rod group 4 is lowered, water begins to enter through the second water inlet 301 and water begins to exit through the water outlet 302 in the cleaning module 3, so that the water in the cleaning module 3 is in a water circulation state, thereby rinsing the flocculent precipitates adsorbed in the activated carbon layer on the outer wall of the insertion rod 403. After rinsing for a period of time, the first insertion rod group 4 is raised and the second insertion rod group 5 is lowered, and this process is repeated until the electroplating wastewater treatment is completed.

[0071] The above descriptions are merely embodiments of the present invention, and common knowledge such as specific structures and / or characteristics in the solutions are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A method for treating electroplating wastewater, characterized in that... The specific steps are as follows: Step 1: Test the electroplating wastewater to be treated and perform pretreatment; Step 2: Add the micro-electrolysis filler from Step 1 to the pretreated electroplating wastewater for micro-electrolysis treatment; Step 3: After micro-electrolysis is completed, the micro-electrolysis filler is activated. Step 4: Adjust the pH value of the electroplating wastewater from Step 3, perform flocculation and sedimentation, clean up the sediment, and the supernatant is the treated water. According to the method for treating electroplating wastewater, the system used includes a micro-electrolysis module for micro-electrolysis reaction and a cleaning module for flocculation and sedimentation, the micro-electrolysis module and the cleaning module are connected; it includes an outer shell, a support frame is fixedly connected to the outer side wall of the outer shell, and a partition is fixedly connected to the inner side wall of the outer shell at one-third of the distance from the bottom wall, the partition divides the interior of the outer shell into the micro-electrolysis module and the cleaning module, the micro-electrolysis module has a first inlet, a first sampling port and a second sampling port from top to bottom, and an aeration port is provided at the bottom of the micro-electrolysis module; The cleaning module has a second water inlet and a water outlet on both sides of its bottom. The partition has several holes, and piston valves are fixedly connected to the holes. The first and second rod groups are arranged alternately below the partition. The first and second rod groups have the same mechanism. The first rod group includes a main rod and several cross rods. The cross rods are fixedly connected to and communicate with the main rod. Several rods are fixedly connected to each cross rod. An activated carbon layer is fixedly connected to the outer wall of the rod. The inside of the rod is hollow and communicates with the cross rod. Several spray holes are provided on the side wall of the rod. The inside of the rod is filled with iron powder, and the spray holes are used to spray out the iron powder. An electric telescopic rod is fixedly connected to the bottom of the main rod. The end of the electric telescopic rod away from the main rod is fixedly connected to the bottom wall of the outer shell. A powder inlet is provided on the side of the main rod away from the electric telescopic rod. A flexible hose is connected to the powder inlet. The end of the flexible hose away from the powder inlet penetrates the side wall of the outer shell and is connected to a centrifugal pump.

2. The method for treating electroplating wastewater according to claim 1, characterized in that: The micro-electrolysis filler in step one is activated carbon and iron powder.

3. The method for treating electroplating wastewater according to claim 1, characterized in that: In step one, the pH value, color, COD and heavy metals of the electroplating wastewater to be treated are tested. The pretreatment method is to adjust the pH value of the electroplating wastewater to 2-4 with 5% sulfuric acid or 5% NaOH.

4. The method for treating electroplating wastewater according to claim 1, characterized in that: The micro-electrolysis treatment in step two takes 10-60 minutes.

5. The method for treating electroplating wastewater according to claim 1, characterized in that: The activation treatment method for the micro-electrolysis filler in step three is as follows: after the micro-electrolysis reaction, remove the residue on the surface of the activated carbon, add iron powder, and circulate water in an environment with a pH value of 2-4 for 30 minutes.

6. The method for treating electroplating wastewater according to claim 1, characterized in that: In step four, the pH value of the electroplating wastewater is adjusted to 8-10.

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