An environmentally friendly and harmless treatment process for recyclable electrophoresis solutions

Abstract

This invention discloses an environmentally friendly and harmless treatment process for recyclable electrophoresis solution, comprising a storage tank, the outlet of which is connected to a coarse screen tank, the outlet of a plate and frame ultrafiltration tank is connected to a bioreactor, and the outlet of the bioreactor is connected to a filter press. This invention achieves the recycling of the electrophoresis solution through graded treatment in the coarse and fine screen tanks, deep filtration in the plate and frame ultrafiltration tank, mixing and stirring in the bioreactor, and solid-liquid separation in the filter press. This reduces wastewater discharge and environmental pollution. By organically combining physical and biological treatment, harmful substances in the electrophoresis solution can be effectively removed while retaining its recyclable components. This not only helps reduce environmental pollution but also lowers production costs and improves the economic benefits for enterprises. Furthermore, the neutralizing agent used is an organic acid or organic amine, which has better biodegradability and a smaller potential environmental impact.

Description

Technical Field

[0001] This invention relates to the field of electrophoresis solution treatment technology, specifically to an environmentally friendly and harmless treatment process for recyclable electrophoresis solutions. Background Technology

[0002] Electrophoretic coating solution plays a crucial role in the electrophoretic coating process, but the waste liquid generated after its use contains harmful substances such as heavy metal ions, organic solvents, and additives. If the electrophoretic coating wastewater is not recycled, it will not only increase the cost of electrophoretic coating, but also pollute the soil, water sources, and atmosphere if the waste liquid is discharged directly without treatment, affecting the ecological balance and human health, and causing serious environmental pollution. Therefore, environmentally friendly and harmless treatment of electrophoretic solution can not only help reduce environmental pollution, but also improve resource utilization efficiency and promote the green transformation and sustainable development of the entire industry.

[0003] In existing electrophoresis solutions, ultrafiltration membrane modules are typically used for deep filtration. However, these modules require disassembly and cleaning after a period of use. Failure to clean them promptly can lead to clogging and damage, significantly reducing their filtration efficiency and lifespan. For example, the ultrafiltration system for cathodic electrophoresis disclosed in patent CN203208902U requires regular cleaning of the ultrafiltration membrane module after long-term use to prevent clogging and damage. However, this ultrafiltration membrane module is not easy to disassemble and assemble. If the disassembly and assembly process is complex, operators need to spend a lot of time on installation and disassembly, which directly leads to low efficiency in processing electrophoresis solutions. This inconvenience is further amplified when frequent replacement or cleaning of the ultrafiltration membrane is required.

[0004] Therefore, it is necessary to invent an environmentally friendly and harmless treatment process for recyclable electrophoretic solutions to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide an environmentally friendly and harmless treatment process for recyclable electrophoretic solutions, in order to solve the problem that electrophoretic solutions cannot be recycled in the current technology.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a recyclable, environmentally friendly, and harmless electrophoresis solution treatment process, comprising a storage tank, a coarse screen tank, a fine screen tank, a plate and frame ultrafiltration tank, a bioreactor, and a filter press. The outlet of the storage tank is connected to the coarse screen tank, the outlet of the coarse screen tank is connected to the fine screen tank, the outlet of the fine screen tank is connected to the plate and frame ultrafiltration tank, the plate and frame ultrafiltration tank has an internal mounting frame, an ultrafiltration membrane is slidably installed inside the mounting frame, the outlet of the plate and frame ultrafiltration tank is connected to the bioreactor, and the outlet of the bioreactor is connected to the filter press.

[0007] Preferably, the gap between the bars in the coarse screen pool is larger than the gap between the bars in the fine screen pool, so that the coarse screen pool can remove large particulate impurities in the electrophoresis solution, while the fine screen pool further refines the process and removes smaller particles, which can effectively improve the purity of the electrophoresis solution.

[0008] Preferably, multiple ultrafiltration membranes are provided, and the multiple ultrafiltration membranes are evenly distributed in an array. A handle is fixedly installed on the front side of the multiple ultrafiltration membranes, so that the multiple ultrafiltration membranes can deeply filter the electrophoresis solution and remove suspended solids, colloids, bacteria and other tiny particles, as well as some large molecular organic matter.

[0009] Preferably, the top and bottom of the ultrafiltration membrane are fixedly installed with sliders, the sliders are disposed inside the mounting frame, and a groove is provided at the contact position between the mounting frame and the slider. The slider and the groove are slidably connected, so that the slider and the groove can be easily slidably installed and removed from the ultrafiltration membrane.

[0010] Preferably, the upper and lower ends of the front side of the mounting frame are hinged to limit plates, and the limit plates are threaded with fixing bolts, so that the limit plates can limit the installation position of the ultrafiltration membrane.

[0011] Preferably, the number of fixing bolts and sliders is the same, and a screw hole is provided at the contact position between the slider and the fixing bolt. The outer thread of the fixing bolt and the inner thread of the screw hole are matched so that the fixing bolt and the screw hole can fix the ultrafiltration membrane in the correct position and ensure the stability of the ultrafiltration membrane installation.

[0012] Preferably, the steps include:

[0013] Step 1: First, the electrophoresis solution is passed through a coarse screen tank and a fine screen tank for pretreatment to remove larger particulate impurities from the electrophoresis solution.

[0014] Step 2: Next, the electrophoretic solution filtered through the coarse and fine screen tanks is passed into a plate and frame ultrafiltration tank for deep filtration. The multiple ultrafiltration membranes in the plate and frame ultrafiltration tank can further remove suspended solids, colloids, bacteria and other tiny particles, as well as some large organic molecules in the electrophoretic solution, thereby obtaining a purer electrophoretic solution.

[0015] Step 3: Then, the electrophoresis solution filtered by the plate and frame ultrafiltration tank is passed into the bioreactor, and coagulant, neutralizer, oxidant and decolorizing agent are added and mixed. The coagulant can cause the suspended solids and colloidal particles in the electrophoresis solution to aggregate into larger clumps, which facilitates subsequent solid-liquid separation. The neutralizer can react with the resin in the electrophoresis solution, thereby changing its pH. The decolorizing agent can effectively remove the pigments in the electrophoresis solution and further improve the clarity of the electrophoresis solution.

[0016] Step 4: Finally, the mixed electrophoretic solution is passed into a filter press for solid-liquid separation. The filter press can separate the solid particles and liquid in the electrophoretic solution through pressure, thereby achieving the purification of the electrophoretic solution.

[0017] Preferably, the neutralizing agent in step three is an organic acid.

[0018] Preferably, the top of the bioreactor is provided with feeding hoppers on the left and right sides, and a rotary motor is provided at the center of the top of the bioreactor. The output end of the rotary motor is fixedly connected to a stirrer, which is located inside the bioreactor. Driven by the rotary motor, the stirrer generates stirring force in the bioreactor, so that the materials are fully mixed. This not only increases the contact area between reactants, but also makes the reactants more evenly distributed, thereby improving the reaction rate and efficiency.

[0019] The technical effects and advantages provided by the present invention in the above technical solution are as follows:

[0020] 1. The entire treatment process, which includes graded treatment in coarse and fine screen tanks, deep filtration in plate and frame ultrafiltration tanks, mixing and stirring treatment in bioreactors, and solid-liquid separation in filter presses, aims to achieve the recycling of electrophoresis solution, reduce waste discharge, and lower environmental pollution. Through the organic combination of physical and biological treatment, harmful substances in the electrophoresis solution can be effectively removed while retaining its recyclable components. This not only helps reduce environmental pollution but also lowers production costs and improves the economic benefits of enterprises. Furthermore, the neutralizing agents used are organic acids or organic amines, which have better biodegradability and have a smaller potential impact on the environment.

[0021] 2. By using sliders and grooves, the mounting frame and ultrafiltration membrane are connected by a sliding disassembly structure, making the installation and disassembly of the ultrafiltration membrane simple and quick. Operators only need to align the slider on the ultrafiltration membrane with the groove in the mounting frame and then gently push it to complete the installation. Conversely, disassembly can be achieved by moving the slider away from the groove. The setting of fixing bolts and screw holes ensures the stability of the ultrafiltration membrane installed inside the mounting frame. As a result, the quick installation and disassembly of the ultrafiltration membrane makes the maintenance process more efficient, reduces maintenance time, and thus reduces maintenance costs. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the exploded three-dimensional structure of the mounting frame and ultrafiltration membrane of the present invention;

[0024] Figure 3 For the present invention Figure 2 Enlarged 3D structural diagram at point A in the middle;

[0025] Figure 4 This is a three-dimensional structural diagram of the bioreactor of the present invention;

[0026] Figure 5 This is a schematic diagram of the process flow structure of the present invention.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1. Storage tank; 2. Coarse screen tank; 3. Fine screen tank; 4. Plate and frame ultrafiltration tank; 5. Mounting frame; 6. Ultrafiltration membrane; 7. Handle; 8. Slider; 9. Slide rail; 10. Limiting plate; 11. Fixing bolt; 12. Screw hole; 13. Bioreactor; 14. Feed hopper; 15. Rotary motor; 16. Agitator; 17. Filter press. Detailed Implementation

[0029] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0030] This invention provides, for example Figure 1-5 The illustrated recyclable electrophoresis solution environmentally friendly and harmless treatment process includes a storage tank 1, the outlet of which is connected to a coarse screen tank 2, the outlet of which is connected to a fine screen tank 3, the outlet of which is connected to a plate and frame ultrafiltration tank 4, the plate and frame ultrafiltration tank 4 having an installation frame 5 inside, an ultrafiltration membrane 6 being slidably installed inside the installation frame 5, the outlet of which is connected to a bioreactor 13, and the outlet of which is connected to a filter press 17.

[0031] The spacing between the bars in the coarse screen tank 2 is larger than that in the fine screen tank 3. Multiple ultrafiltration membranes 6 are provided, and the multiple ultrafiltration membranes 6 are evenly distributed in an array at equal intervals. Handles 7 are fixedly installed on the front side of the multiple ultrafiltration membranes 6. Slider 8s are fixedly installed on the top and bottom of the ultrafiltration membranes 6. The slider 8s are located inside the mounting frame 5. A groove 9 is provided at the contact position between the mounting frame 5 and the slider 8. The slider 8 and the groove 9 are slidably connected. The upper and lower ends of the front side of the mounting frame 5 are hinged to limit plates 10. Fixed bolts 11 are threadedly connected to the limit plates 10. The number of fixed bolts 11 is the same as that of the slider 8. A screw hole 12 is provided at the contact position between the slider 8 and the fixed bolt 11. The outer thread of the fixed bolt 11 is engaged with the inner thread of the screw hole 12. Feed hoppers 14 are provided on the left and right sides of the top of the bioreactor 13. A rotary motor 15 is provided at the center of the top of the bioreactor 13. A stirrer 16 is fixedly connected to the output end of the rotary motor 15. The stirrer 16 is located inside the bioreactor 13.

[0032] Includes the following steps:

[0033] Step 1: First, the electrophoresis solution is passed into the coarse screen tank 2 and the fine screen tank 3 for pretreatment to remove larger particulate impurities in the electrophoresis solution.

[0034] Step 2: Next, the electrophoretic solution filtered through the coarse screen tank 2 and the fine screen tank 3 is passed into the plate and frame ultrafiltration tank 4 for deep filtration. The multiple ultrafiltration membranes 6 in the plate and frame ultrafiltration tank 4 can further remove suspended solids, colloids, bacteria and other small particles, as well as some large organic molecules in the electrophoretic solution, thereby obtaining a purer electrophoretic solution.

[0035] Step 3: Then, the electrophoresis solution filtered through the plate and frame ultrafiltration tank 4 is passed into the bioreactor 13, and coagulant, neutralizer, oxidant and decolorizing agent are added and mixed. The coagulant can cause the suspended solids and colloidal particles in the electrophoresis solution to aggregate into larger clumps, which facilitates subsequent solid-liquid separation. The neutralizer can react with the resin in the electrophoresis solution, thereby changing its pH. The decolorizing agent can effectively remove the pigments in the electrophoresis solution and further improve the clarity of the electrophoresis solution.

[0036] Step 4: Finally, the mixed electrophoretic solution is passed into the filter press 17 for solid-liquid separation. The filter press 17 can separate the solid particles and liquid in the electrophoretic solution through pressure, thereby achieving the purification treatment of the electrophoretic solution.

[0037] The neutralizing agent in step three is an organic acid or an organic amine.

[0038] The coarse screen tank 2 removes large particles of impurities from the electrophoresis solution, while the fine screen tank 3 further refines the solution, removing even smaller particles and thus improving the purity of the electrophoresis solution. Multiple ultrafiltration membranes 6 increase the filtration area and improve filtration efficiency, enabling deep filtration of the electrophoresis solution and removing suspended solids, colloids, bacteria, and other tiny particles, as well as some large organic molecules. The slider 8 and groove 9 facilitate the sliding and disassembly of the ultrafiltration membranes 6, making subsequent disassembly and cleaning easier. Simultaneously, the stirrer 16, driven by the rotary motor 15, generates stirring force within the bioreactor 13, ensuring thorough mixing of the materials. This not only increases the contact area between reactants but also makes the reactants more evenly distributed, thereby improving the reaction rate and efficiency.

[0039] Working principle of this invention:

[0040] Refer to the instruction manual appendix Figure 1-5When using this invention, firstly, the electrophoresis solution is passed into a coarse screen tank 2 for preliminary filtration of large particulate impurities. After preliminary filtration, the electrophoresis solution is further filtered through a fine screen tank 3 to remove even finer impurities. The electrophoresis solution after two filtrations is then passed into a plate and frame ultrafiltration tank 4, where multiple ultrafiltration membranes 6 further remove suspended solids, colloids, bacteria, and other tiny particles, as well as some large organic molecules. Then, the electrophoresis solution filtered by the plate and frame ultrafiltration tank 4 is passed into a bioreactor 13, where coagulants, neutralizers, oxidants, and decolorizing agents are added and mixed. Then, a rotary motor 15 is started, which drives the stirrer 16 inside the bioreactor 13 to fully mix and stir the coagulants, neutralizers, oxidants, decolorizing agents, and electrophoresis solution, promoting the chemical reaction and effectively removing suspended solids, colloids, bacteria, and other impurities from the electrophoresis solution, thereby improving the clarity and quality of the electrophoresis solution.

Claims

1. A recyclable, environmentally friendly, and harmless electrophoretic solution treatment process, comprising a storage tank (1), a coarse screen tank (2), a fine screen tank (3), a plate and frame ultrafiltration tank (4), a bioreactor (13), and a filter press (17), characterized in that: The outlet of the storage tank (1) is connected to a coarse screen tank (2), the outlet of the coarse screen tank (2) is connected to a fine screen tank (3), the outlet of the fine screen tank (3) is connected to a plate and frame ultrafiltration tank (4), the plate and frame ultrafiltration tank (4) is provided with an installation frame (5), and an ultrafiltration membrane (6) is slidably installed inside the installation frame (5). The outlet of the plate and frame ultrafiltration tank (4) is connected to a bioreactor (13), and coagulant, neutralizer, oxidant and decolorizing agent are added to the bioreactor (13) and mixed and stirred. The coagulant can promote the aggregation of suspended solids and colloidal particles in the electrophoresis solution into larger clumps, which is convenient for subsequent solid-liquid separation. The neutralizer can react with the resin in the electrophoresis solution, thereby changing its pH. The decolorizing agent can effectively remove the pigments in the electrophoresis solution and further improve the clarity of the electrophoresis solution. The outlet of the bioreactor (13) is connected to There is a filter press (17), and multiple ultrafiltration membranes (6) are provided. The multiple ultrafiltration membranes (6) are evenly distributed in an array. A handle (7) is fixedly installed on the front side of the multiple ultrafiltration membranes (6). A slider (8) is fixedly installed on the top and bottom of the ultrafiltration membrane (6). The slider (8) is set inside the mounting frame (5). A groove (9) is opened at the contact position between the mounting frame (5) and the slider (8). The slider (8) and the groove (9) are slidably connected. The upper and lower ends of the front side of the mounting frame (5) are hinged to a limiting plate (10). A fixing bolt (11) is threaded on the limiting plate (10). The number of fixing bolts (11) is the same as that of the slider (8). A screw hole (12) is opened at the contact position between the slider (8) and the fixing bolt (11). The outer wall thread of the fixing bolt (11) is engaged with the inner wall thread of the screw hole (12).

2. The environmentally friendly and harmless treatment process for recyclable electrophoretic solution according to claim 1, characterized in that: The gap between the bars in the coarse grid pool (2) is greater than the gap between the bars in the fine grid pool (3).

3. The environmentally friendly and harmless treatment process for recyclable electrophoretic solution according to claim 1, characterized in that: Includes the following steps: Step 1: First, the electrophoresis solution is passed into the coarse screen tank (2) and the fine screen tank (3) for pretreatment to remove larger particulate impurities in the electrophoresis solution; Step 2: Next, the electrophoretic solution filtered by the coarse screen tank (2) and the fine screen tank (3) is passed into the plate and frame ultrafiltration tank (4) for deep filtration. The multiple ultrafiltration membranes (6) in the plate and frame ultrafiltration tank (4) can further remove suspended solids, colloids, bacteria and other small particles, as well as some large organic molecules in the electrophoretic solution, so as to obtain a purer electrophoretic solution. Step 3: Then, the electrophoresis solution filtered by the plate and frame ultrafiltration tank (4) is passed into the bioreactor (13), and coagulant, neutralizer, oxidant and decolorizing agent are added and mixed. The coagulant can promote the aggregation of suspended matter and colloidal particles in the electrophoresis solution into larger clumps, which facilitates subsequent solid-liquid separation. The neutralizer can react with the resin in the electrophoresis solution, thereby changing its pH. The decolorizing agent can effectively remove pigments in the electrophoresis solution and further improve the clarity of the electrophoresis solution. Step 4: Finally, the mixed and stirred electrophoretic solution is passed into the filter press (17) for solid-liquid separation. The filter press (17) can separate the solid particles and liquid in the electrophoretic solution through pressure, thereby achieving the purification treatment of the electrophoretic solution.

4. The environmentally friendly and harmless treatment process for recyclable electrophoretic solution according to claim 3, characterized in that: The neutralizing agent in step three is an organic acid.

5. The environmentally friendly and harmless treatment process for recyclable electrophoretic solution according to claim 3, characterized in that: The top of the bioreactor (13) is provided with a feeding hopper (14) on the left and right sides. A rotary motor (15) is provided at the center of the top of the bioreactor (13). A stirrer (16) is fixedly connected to the output end of the rotary motor (15). The stirrer (16) is located inside the bioreactor (13).

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