Multi-stage sewage treatment unit, recycling system and purification method for machining waste liquid

Abstract

The present invention discloses a multi-stage sewage treatment unit, a recycling system and a purification method for machining waste liquid, which relates to the technical field of machining waste liquid treatment. The multi-stage sewage treatment unit for machining waste liquid includes a coarse screening filtration unit, a primary sedimentation unit and a sewage treatment tank. The interior of the sewage treatment tank is provided with a chemical reaction unit, a secondary sedimentation unit, a filtration unit and a disinfection unit. The bottom of the inner cavity of the chemical reaction unit is provided with a liquid inlet assembly. The present invention has a reasonable structure. Through the electromagnetic heat exchange mechanism provided, when the bubbles pass through the outer cover and the top cover, the heat is also transferred to the waste liquid or bubbles through energy conversion. When the waste liquid and the bubbles carry heat through the electrochemical treatment mechanism, the reaction rate can be increased. Heating can significantly increase the rate of the electrochemical reaction. A higher temperature increases the reaction rate constant, thereby accelerating the pollutant removal and wastewater treatment process, resulting in a shorter treatment time and higher treatment efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of machining waste liquid treatment, and in particular to a multi-stage sewage treatment unit, a recycling system and a purification method for machining waste liquid. Background Art

[0002] Machining wastewater is wastewater generated during the machining process, which usually contains various types of wastewater and pollutants. Machining is a processing process widely used in the manufacturing industry to manufacture parts, assembly parts and other workpieces. In machining, cutting, grinding, drilling and other processing methods are usually used to process raw materials into workpieces of desired shape and size;

[0003] The composition and properties of machining wastewater may vary depending on the type of process and material being machined, but typically include the following types of wastewater and pollutants: coolant wastewater, metal swarf, oil, dust and particulate matter, organic and inorganic pollutants.

[0004] For example, the invention with publication number CN111841143A and name is a waste liquid treatment device, which provides a waste liquid treatment device, which enables processing chips to be precipitated more effectively in a sedimentation tank. The sedimentation part in the sedimentation tank for settling the processing chips contained in the processing waste liquid has a plurality of partition plates that are horizontally crossed with the direction of flow of the processing waste liquid and are separated by specified intervals, forming a serrated flow path for the processing waste liquid to flow in the horizontal direction, ensuring the time for the processing chips to be settled relative to the time the processing waste liquid flows in the flow path, so that the processing chips can be reliably settled.

[0005] When waste liquid is reacted by electrochemical treatment, it usually takes a long reaction time. In addition, due to the temperature difference, the waste water needs to adjust the appropriate reaction time for sufficient electrolysis reaction when undergoing electrochemical treatment, and more effective chemical reactants are also required. Therefore, this application provides a multi-stage sewage treatment unit, a recycling system and a purification method for machining waste liquid to meet the needs. Summary of the Invention

[0006] The purpose of this application is to provide a multi-stage sewage treatment unit, a recycling system and a purification method for machining waste liquid, which can effectively solve the problems raised in the above background technology.

[0007] To achieve the above-mentioned objectives, the present application provides the following technical solutions: a multi-stage sewage treatment unit for machining waste liquid, including a coarse screening filtration unit, a primary sedimentation unit and a sewage treatment tank, the interior of the sewage treatment tank is provided with a chemical reaction unit, a secondary sedimentation unit, a filtration unit and a disinfection unit, a liquid inlet assembly is provided at the bottom of the inner cavity of the chemical reaction unit, the liquid inlet assembly is used to guide the flow of sewage, the outer surface of the sewage treatment tank is provided with a bubble generator extending into the interior of the chemical reaction unit, the interior of the bubble generator is provided with an electromagnetic heat exchange mechanism, the electromagnetic heat exchange mechanism is used to heat the bubbles generated by the bubble generator, and an electrochemical treatment mechanism is provided inside the chemical reaction unit and above the electromagnetic heat exchange mechanism.

[0008] Preferably, the liquid inlet assembly comprises a mounting shell arranged at the bottom of the inner cavity of the chemical reaction unit, and a plurality of liquid outlet holes distributed in a rectangular array are provided on the outer surface of the mounting shell.

[0009] Preferably, the bubble generator includes a bubble generator and an air compressor, the air compressor is installed on the upper side of the sewage treatment tank, the bubble generator is installed inside the chemical reaction unit, a ventilation pipe is provided on the outer surface of the air compressor, one end of the ventilation pipe passes through the sewage treatment tank and is connected to the bubble generator, and a plurality of bubble heads distributed in a rectangular array are provided on the upper part of the bubble generator.

[0010] Preferably, the electromagnetic heat exchange mechanism includes a mounting tube mounted on the outside of the bubble head, an outer cover is provided on the top of the mounting tube, a plurality of leakage holes are opened on the outer surface of the outer cover, a snap ring is provided on the top of the outer cover, and a top cover is provided inside the snap ring;

[0011] A support is provided inside the outer cover, and a multi-layer heating cover is provided inside the support, and a plurality of bubble holes distributed in a ring array are opened on the upper end of the support, a heating wire disk is provided at the bottom of the inner cavity of the multi-layer heating cover, and a cone cover head is provided on the upper part of the outer surface of the multi-layer heating cover, and the upper end of the cone cover head extends to the outside of the top cover.

[0012] Preferably, the multi-layer heating cover is in the shape of a funnel, and a plurality of exhaust holes distributed in a ring array are provided on the upper portion of the outer surface of the multi-layer heating cover.

[0013] A multi-stage sewage treatment unit recycling system for machining wastewater, based on the recycling system adopted by the multi-stage sewage treatment unit for machining wastewater mentioned above: the machining wastewater is first introduced into a coarse screening filter unit, after which the wastewater is transported to a primary sedimentation unit through a filter pipe. The wastewater entering the primary sedimentation unit allows larger solid particles to settle there, making them easier to remove in a later treatment step;

[0014] After primary sedimentation, the wastewater is pumped into the sewage treatment tank. The wastewater first passes through the chemical reaction unit for catalytic reaction, and then enters the secondary sedimentation unit to precipitate impurities in the water. The precipitated wastewater is filtered again by the filtration unit and then transported to the disinfection unit for disinfection before reuse.

[0015] The chemical reaction unit consists of three parts: a bubble generator, an electromagnetic heat exchange mechanism, and an electrochemical treatment mechanism. Wastewater first passes through the bubble generator for bubble catalysis, and a large number of bubbles rise rapidly into the electromagnetic heat exchange mechanism. The electromagnetic heat exchange mechanism transfers heat to the bubbles, which then rise to the electrochemical treatment mechanism.

[0016] By heating the bubbles, the rate of electrochemical treatment can be increased, improving the efficiency of wastewater treatment. Chemical reactions are generally faster at high temperatures, which can purify wastewater more quickly.

[0017] Preferably, the coarse screening filter unit is used to remove large particles in the wastewater, such as metal chips, gravel and other large particle impurities, which can prevent these substances from entering subsequent treatment units and reduce damage to the system.

[0018] Preferably, primary sedimentation allows suspended solids in the wastewater to settle to the bottom, forming a sludge, with clear water discharged at the top, and the sludge typically requires periodic cleaning and disposal.

[0019] A purification method of a multi-stage sewage treatment unit for machining waste liquid, the specific purification method of machining waste liquid is as follows:

[0020] Step 1: When purifying the waste liquid, the waste liquid is introduced into a coarse screening filter unit, and large particles of solid waste are removed by using a grid, a grille or a physical filter device in the coarse screening filter unit. The waste liquid is then introduced into a primary sedimentation unit. After the waste liquid is initially precipitated by the primary sedimentation unit, the waste liquid is introduced into a chemical reaction unit.

[0021] Step 2: The waste liquid entering the chemical reaction unit first passes through the liquid inlet component to guide the water flow slowly upward. The air source in the bubble generator continuously inflates the waste liquid to generate bubbles. The bubbles generated are light in mass and will quickly float upward. The upward-floating bubbles will enter the electromagnetic heat exchange mechanism. After the bubbles are heated by the energy conversion of the electromagnetic heat exchange mechanism, the heat will be transferred to the waste liquid and the bubbles.

[0022] Step 3: After the waste liquid and the generated bubbles are heated by the electromagnetic heat exchange mechanism, they will flow upward. The waste liquid with bubbles will pass through the electrochemical treatment mechanism to undergo an electrochemical reaction. The current passes through the anode and cathode electrodes to trigger oxidation and reduction reactions. The electrochemical reaction can decompose or remove organic matter, heavy metals, ammonia nitrogen and other pollutants in the waste water. In addition, the bubble generator generates a large number of hot bubbles in the waste liquid and the waste liquid also carries heat, so that the waste liquid can help improve the electrolyte conductivity and enhance the current transmission efficiency when reacting in the electrochemical treatment mechanism, thereby improving the efficiency of the electrochemical treatment.

[0023] Step 4: After the waste liquid undergoes chemical reaction through the electrochemical treatment mechanism, it will flow into the secondary sedimentation unit. The particles in the precipitated wastewater entering the secondary sedimentation unit will be introduced into the filtration unit. The filtration unit will filter the particulate impurities in the wastewater. After the filtered wastewater meets the discharge standards, it will be introduced into the disinfection unit. The disinfection unit will disinfect the wastewater and then recycle it.

[0024] In summary, the technical effects and advantages of the present invention are:

[0025] 1. The present invention has a reasonable structure. Through the electromagnetic heat exchange mechanism, when the bubbles pass through the outer cover and the top cover, heat is also transferred to the waste liquid or bubbles through energy conversion. When the waste liquid and bubbles carry heat through the electrochemical treatment mechanism, the reaction rate can be increased. Heating can significantly increase the rate of the electrochemical reaction. Higher temperatures increase the reaction rate constant, thereby accelerating the removal of pollutants and the wastewater treatment process, resulting in shorter treatment time and higher treatment efficiency.

[0026] 2. The electromagnetic heat exchange mechanism provided in the present invention can increase oxygen solubility. Increasing temperature helps to increase the solubility of oxygen in water. In some electrochemical processes, such as redox reactions, oxygen is essential. Therefore, increasing oxygen solubility can improve reaction efficiency and reduce electrode polarization. In electrochemical processes, electrode polarization refers to uneven current density on the electrode surface, which may lead to decreased efficiency. Increasing temperature can reduce electrode polarization and help maintain a stable current density.

[0027] 3. The electromagnetic heat exchange mechanism provided in the present invention can improve material transport. The increase in temperature can improve the material transport performance, including pollutants and reaction products in the wastewater, and help ensure that the reaction products quickly leave the electrode surface, thereby improving the efficiency of the electrochemical reaction and reducing the electrolyte concentration. The increase in temperature can reduce the required electrolyte concentration, thereby reducing the amount of chemicals used in wastewater treatment and reducing treatment costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 A schematic diagram of the three-dimensional structure of a multi-stage sewage treatment unit for machining waste liquid;

[0030] Figure 2 A three-dimensional cross-sectional view of a multi-stage sewage treatment unit for machining wastewater;

[0031] Figure 3 It is a schematic diagram of the three-dimensional connection structure of the bubble generator and the liquid inlet component;

[0032] Figure 4 Schematic diagram of the three-dimensional connection structure of the liquid inlet component;

[0033] Figure 5 Schematic diagram of the three-dimensional connection structure of the bubble generator;

[0034] Figure 6 Schematic diagram of the three-dimensional connection structure of the electromagnetic heat exchange mechanism;

[0035] Figure 7 It is a cross-sectional view of the three-dimensional connection structure of the electromagnetic heat exchange mechanism;

[0036] Figure 8 Schematic diagram of the three-dimensional connection structure of the outer cover;

[0037] Figure 9 Schematic diagram of the three-dimensional connection structure of the top cover;

[0038] Figure 10 It is a cross-sectional view of the three-dimensional connection structure of the electromagnetic heat exchange mechanism;

[0039] Figure 11 This is a diagram of the recycling system of the multi-stage sewage treatment unit for machining wastewater.

[0040] In the figure: 1. Sewage treatment tank; 2. Bubble generator; 21. Air compressor; 22. Vent pipe; 23. Bubble generator; 24. Bubble head; 3. Electrochemical treatment mechanism; 4. Liquid inlet assembly; 41. Mounting shell; 42. Liquid outlet; 5. Electromagnetic heat exchange mechanism; 51. Outer cover; 52. Top cover; 53. Multi-layer heating cover; 54. Support member; 55. Cone cover head; 56. Mounting pipe; 57. Leak hole; 58. Snap ring; 59. Heating wire reel; 511. Exhaust hole; 512. Bubble hole; 6. Chemical reaction unit; 7. Secondary sedimentation unit; 8. Filtration unit; 9. Disinfection unit; 10. Primary sedimentation; 11. Coarse screen filtration unit. DETAILED DESCRIPTION

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0042] refer to Figure 1-11 The multi-stage sewage treatment unit for machining waste liquid shown includes a coarse screening filtration unit 11, a primary sedimentation unit 10 and a sewage treatment tank 1. A chemical reaction unit 6, a secondary sedimentation unit 7, a filtration unit 8 and a disinfection unit 9 are arranged inside the sewage treatment tank 1. A liquid inlet component 4 is arranged at the bottom of the inner cavity of the chemical reaction unit 6. The liquid inlet component 4 is used to guide the flow of sewage. The outer surface of the sewage treatment tank 1 is provided with a bubble generator 2 extending into the interior of the chemical reaction unit 6. An electromagnetic heat exchange mechanism 5 is arranged inside the bubble generator 2. The electromagnetic heat exchange mechanism 5 is used to heat the bubbles generated by the bubble generator 2. An electrochemical treatment mechanism 3 is arranged inside the chemical reaction unit 6 and above the electromagnetic heat exchange mechanism 5.

[0043] It is worth noting that when purifying waste liquid, the waste liquid is introduced into the coarse screening filter unit 11, and the large particles of solid waste are removed by using a grid, a grille or a physical filtering device in the coarse screening filter unit 11, and then the waste liquid is introduced into the primary sedimentation 10. After the waste liquid is initially precipitated by the primary sedimentation 10, the waste liquid is introduced into the chemical reaction unit 6. The waste liquid entering the chemical reaction unit 6 first passes through the liquid inlet component 4 to guide the water flow to flow slowly upward, and the air source in the bubble generator 2 continuously inflates the waste liquid to generate bubbles, and the generated bubbles are lighter in mass and will quickly float upward. The bubbles floating upward will enter the electromagnetic heat exchange mechanism 5, and the bubbles are heated by energy conversion of the electromagnetic heat exchange mechanism 5, and the heat is transferred to the waste liquid and the bubbles.

[0044] The waste liquid and the generated bubbles will flow upward after being heated by the electromagnetic heat exchange mechanism 5. The waste liquid with bubbles will pass through the electrochemical treatment mechanism 3 to undergo an electrochemical reaction. The current will pass through the anode and cathode electrodes to trigger oxidation and reduction reactions. The electrochemical reaction can decompose or remove organic matter, heavy metals, ammonia nitrogen and other pollutants in the waste water. In addition, the bubble generator 2 generates a large number of hot bubbles in the waste liquid and the waste liquid also carries heat, so that the waste liquid can help improve the electrolyte conductivity and enhance the current transmission efficiency when reacting in the electrochemical treatment mechanism 3, thereby improving the efficiency of the electrochemical treatment.

[0045] After the waste liquid undergoes chemical reaction through the electrochemical treatment mechanism 3, it will flow into the secondary sedimentation unit 7. The particles in the precipitated wastewater entering the secondary sedimentation unit 7 will be introduced into the filtration unit 8. The filtration unit 8 will filter the particulate impurities in the wastewater. After the filtered wastewater meets the discharge standards, it will be introduced into the disinfection unit 9. The disinfection unit 9 will disinfect the wastewater and then recycle it.

[0046] The liquid inlet assembly 4 includes a mounting shell 41 disposed at the bottom of the inner cavity of the chemical reaction unit 6 . The outer surface of the mounting shell 41 is provided with a plurality of liquid outlet holes 42 distributed in a rectangular array.

[0047] Furthermore, when the waste liquid is introduced into the mounting shell 41 through the water pump, the waste liquid first enters the mounting shell 41. Since the flow rate of the waste liquid entering the mounting shell 41 is relatively high, the waste liquid passes through the liquid outlet 42 on the mounting shell 41, disrupting the flow rate, and then allows the waste liquid to flow slowly upward.

[0048] The bubble generator 2 includes a bubble generator 23 and an air compressor 21. The air compressor 21 is installed on the upper side of the sewage treatment tank 1, and the bubble generator 23 is installed inside the chemical reaction unit 6. A ventilation pipe 22 is provided on the outer surface of the air compressor 21. One end of the ventilation pipe 22 passes through the sewage treatment tank 1 and is connected to the bubble generator 23. A plurality of bubble heads 24 distributed in a rectangular array are provided on the upper part of the bubble generator 23.

[0049] Furthermore, the air compressor 21 fills the gas into the vent pipe 22, the gas enters the bubble generator 23 through the vent pipe 22, and then the bubbles are ejected through the bubble head 24 on the bubble generator 23. The generation of bubbles requires waste liquid as a medium, and the size of the ejected bubbles depends on the mechanical control of the bubble head 24.

[0050] The electromagnetic heat exchange mechanism 5 includes a mounting tube 56 mounted on the outside of the bubble head 24. An outer cover 51 is provided on the top of the mounting tube 56. A plurality of leakage holes 57 are formed on the outer surface of the outer cover 51. A snap ring 58 is provided on the top of the outer cover 51. A top cover 52 is provided inside the snap ring 58.

[0051] A support member 54 is provided inside the outer cover 51, and a multi-layer heating cover 53 is provided inside the support member 54. A plurality of bubble holes 512 distributed in a ring array are opened at the upper end of the support member 54. A heating wire coil 59 is provided at the bottom of the inner cavity of the multi-layer heating cover 53. A cone cover head 55 is provided on the upper part of the outer surface of the multi-layer heating cover 53, and the upper end of the cone cover head 55 extends to the outside of the top cover 52.

[0052] It is worth noting that after the bubble head 24 generates bubbles, the bubbles will float upwards because they contain a large amount of air, and the floating bubbles will enter the multi-layer heating cover 53, wherein the multi-layer heating cover 53 is heated by electromagnetic heating, so that the bubbles entering the multi-layer heating cover 53 will carry heat, and the bubbles in the center will be heated again by the heating wire disk 59, which can quickly heat the bubbles in the center and the wastewater. Figure 10 The shape shown enables the bubbles to stay in the multi-layer heating cover 53 for a longer time;

[0053] The multi-layer heating cover 53 is funnel-shaped. A plurality of exhaust holes 511 are provided on the upper portion of the outer surface of the multi-layer heating cover 53 in a circular array. Air bubbles and wastewater entering the multi-layer heating cover 53 can flow through the exhaust holes 511. Since the outer cover 51 is mounted on the bubble head 24 via the mounting tube 56, the air bubbles first enter the outer cover 51. Since the multi-layer heating cover 53 is supported by the support member 54 and the conical cover head 55, the heat on the multi-layer heating cover 53 is also transferred to the outer cover 51 and the top cover 52.

[0054] Because the outer cover 51 and the top cover 52 carry heat, and the outer cover 51 and the top cover 52 are Figure 6-Figure 8 As shown in the hollow shape, when the bubbles pass through the outer cover 51 and the top cover 52, heat is also transferred to the waste liquid or the bubbles through energy conversion. When the waste liquid and the bubbles carry heat through the electrochemical treatment mechanism 3, the reaction rate can be increased. Heating can significantly increase the rate of the electrochemical reaction. A higher temperature will increase the reaction rate constant, thereby accelerating the pollutant removal and wastewater treatment process, resulting in a shorter treatment time and higher treatment efficiency.

[0055] It can also increase oxygen solubility. Increasing temperature helps increase the solubility of oxygen in water. In some electrochemical processes, such as redox reactions, oxygen is essential. Therefore, increasing oxygen solubility can improve reaction efficiency and reduce electrode polarization. In electrochemical processes, electrode polarization refers to the uneven current density on the electrode surface, which may lead to a decrease in efficiency. Increasing temperature can reduce electrode polarization and help maintain a stable current density.

[0056] It can also improve material transport. Increasing the temperature can improve the transport performance of materials, including pollutants and reaction products in wastewater, helping to ensure that the reaction products quickly leave the electrode surface, thereby improving the efficiency of electrochemical reactions and reducing electrolyte concentration. Increasing the temperature can reduce the required electrolyte concentration, thereby reducing the amount of chemicals used in wastewater treatment and reducing treatment costs.

[0057] A multi-stage sewage treatment unit recycling system for machining wastewater, based on the recycling system adopted by the multi-stage sewage treatment unit for machining wastewater mentioned above: the machining wastewater is first introduced into a coarse screening filter unit 11, and the wastewater is transported to a primary sedimentation unit 10 through a water filtration pipeline after passing through the coarse screening filter unit 11. The wastewater entering the primary sedimentation unit 10 allows larger solid particles to settle there, so that they are easier to remove in a later treatment step;

[0058] The sludge generated during the primary sedimentation 10 treatment process can be treated and disposed of by sludge concentration, drying, incineration or other methods;

[0059] The specific machining waste liquid treatment system will vary depending on the characteristics of the wastewater, treatment requirements and environmental regulations. The flow chart and system configuration need to be designed and adjusted according to the specific situation. When designing and implementing the machining waste liquid treatment system, the nature of the wastewater, treatment objectives and sustainability requirements need to be considered.

[0060] After the primary sedimentation 10, the wastewater is pumped into the sewage treatment tank 1. The wastewater first passes through the chemical reaction unit 6 for catalytic reaction, and then enters the secondary sedimentation unit 7 for secondary precipitation of impurities in the water. The precipitated wastewater is filtered again by the filtration unit 8 and then transported to the disinfection unit 9 for disinfection before reuse.

[0061] The process of the chemical reaction unit 6 is divided into three parts: the bubble generator 2, the electromagnetic heat exchange mechanism 5, and the electrochemical treatment mechanism 3. The wastewater first passes through the bubble generator 2 for bubble catalysis. A large number of bubbles rise rapidly and are sent to the electromagnetic heat exchange mechanism 5. The electromagnetic heat exchange mechanism 5 transfers heat to the bubbles, which then rise to the electrochemical treatment mechanism 3.

[0062] Heating the bubbles can increase the rate of electrochemical treatment, improving the efficiency of wastewater treatment. Chemical reactions generally proceed faster at high temperatures, allowing wastewater to be purified more quickly.

[0063] The coarse screening filter unit 11 is used to remove large particles in the wastewater, such as metal chips, gravel and other large particle impurities, to prevent these substances from entering subsequent treatment units and reduce damage to the system.

[0064] Primary sedimentation 10 allows suspended solids in the wastewater to settle to the bottom, forming a sludge, with clear water discharged at the top, which typically requires periodic cleaning and disposal.

[0065] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A multi-stage sewage treatment unit for machining waste liquid, comprising a coarse screening filtration unit (11), a primary sedimentation unit (10), and a sewage treatment tank (1), wherein a chemical reaction unit (6), a secondary sedimentation unit (7), a filtration unit (8), and a disinfection unit (9) are provided inside the sewage treatment tank (1), characterized in that: A liquid inlet assembly (4) is provided at the bottom of the inner cavity of the chemical reaction unit (6), and the liquid inlet assembly (4) is used to guide the flow direction of sewage. A bubble generator (2) extending into the interior of the chemical reaction unit (6) is provided on the outer surface of the sewage treatment tank (1). An electromagnetic heat exchange mechanism (5) is provided inside the bubble generator (2), and the electromagnetic heat exchange mechanism (5) is used to heat bubbles generated by the bubble generator (2). An electrochemical treatment mechanism (3) is provided inside the chemical reaction unit (6) and above the electromagnetic heat exchange mechanism (5); The liquid inlet assembly (4) comprises a mounting shell (41) arranged at the bottom of the inner cavity of the chemical reaction unit (6), and a plurality of liquid outlet holes (42) distributed in a rectangular array are formed on the outer surface of the mounting shell (41); The bubble generator (2) comprises a bubble generator (23) and an air compressor (21), wherein the air compressor (21) is installed on an upper side of the sewage treatment tank (1), and the bubble generator (23) is installed inside the chemical reaction unit (6). A vent pipe (22) is provided on the outer surface of the air compressor (21), and one end of the vent pipe (22) passes through the sewage treatment tank (1) and is connected to the bubble generator (23). A plurality of bubble heads (24) distributed in a rectangular array are provided on the upper part of the bubble generator (23); The electromagnetic heat exchange mechanism (5) comprises a mounting tube (56) mounted on the outside of the bubble head (24); an outer cover (51) is provided on the top of the mounting tube (56); a plurality of leakage holes (57) are provided on the outer surface of the outer cover (51); a snap ring (58) is provided on the top of the outer cover (51); and a top cover (52) is provided inside the snap ring (58); A support member (54) is provided inside the outer cover (51), a multi-layer heating cover (53) is provided inside the support member (54), and a plurality of bubble holes (512) distributed in a ring array are provided at the upper end of the support member (54), a heating wire disk (59) is provided at the bottom of the inner cavity of the multi-layer heating cover (53), a cone cover head (55) is provided on the upper portion of the outer surface of the multi-layer heating cover (53), and the upper end of the cone cover head (55) extends to the outside of the top cover (52), and a plurality of exhaust holes (511) distributed in a ring array are provided on the upper portion of the outer surface of the multi-layer heating cover (53).

2. The multi-stage sewage treatment unit for machining waste liquid according to claim 1, characterized in that: The multi-layer heating cover (53) is in the shape of a funnel.

3. A purification method of a multi-stage sewage treatment unit for machining waste liquid according to claim 1, characterized in that: The specific purification methods for machining waste liquid are as follows: Step 1: When purifying the waste liquid, the waste liquid is introduced into a coarse screening filter unit (11), large particles of solid waste are removed by the coarse screening filter unit (11), and then the waste liquid is introduced into a primary sedimentation unit (10). After preliminary precipitation in the primary sedimentation unit (10), the waste liquid is introduced into a chemical reaction unit (6); Step 2: The waste liquid entering the chemical reaction unit (6) first passes through the liquid inlet component (4) to guide the water flow to flow slowly upward, and the air source in the bubble generator (2) continuously inflates the waste liquid to generate bubbles. The generated bubbles are relatively light in mass and quickly float upward. The upwardly floating bubbles will enter the electromagnetic heat exchange mechanism (5). After the bubbles are heated by the electromagnetic heat exchange mechanism (5), the heat is transferred to the waste liquid and the bubbles. Step 3: The waste liquid and the generated bubbles are heated by the electromagnetic heat exchange mechanism (5) and then flow upwards, and undergo electrochemical reaction through the electrochemical treatment mechanism (3). The current passes through the electrodes to induce oxidation and reduction reactions, and the electrochemical reaction removes organic matter, heavy metals and ammonia nitrogen pollutants in the waste water; Step 4: The waste liquid undergoes a chemical reaction in the electrochemical treatment mechanism (3) and then flows into the secondary sedimentation unit (7). The secondary sedimentation unit (7) precipitates particles in the waste water. The precipitated waste water is introduced into the filtration unit (8). The filtration unit (8) filters the particulate impurities in the waste water. After the filtered waste water meets the discharge standard, it is introduced into the disinfection unit (9). The disinfection unit (9) disinfects the waste water and then recycles it.

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