Automobile air conditioner connecting pipe production wastewater pretreatment device

Abstract

The invention provides an automobile air conditioner connecting pipe production wastewater pretreatment device, and belongs to the technical field of wastewater treatment, a device main body is of a cylinder structure, a conical structure is arranged at the bottom of the cylinder structure, and a plurality of rollers are arranged at the bottom of the device main body. The oxidation air flotation chamber is arranged below the air flotation chamber, the electrooxidation chamber is arranged below the oxidation air flotation chamber, the electric flocculation chamber is arranged below the electrooxidation chamber, the precipitation separation chamber is arranged below the electric flocculation chamber, the photocatalysis chamber is arranged on the outer side of the electrooxidation chamber and the outer side of the electric flocculation chamber, and the photocatalysis chamber is arranged above the precipitation separation chamber. The aeration chamber is arranged on the outer sides of the air floatation chamber and the oxidation air floatation chamber, the aeration chamber is arranged above the photocatalysis chamber, the filtering chamber is arranged on the outer side of the aeration chamber, and the filtering chamber is arranged above the photocatalysis chamber. According to the invention, emulsified and suspended macromolecular pollutants in water can be removed through oxidation and air flotation; the precipitation separation efficiency is improved while pollutants are removed through oxidation; the connecting pipe production wastewater is simply, conveniently and efficiently treated.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater treatment, in particular to a wastewater pretreatment device for automobile air-conditioning connecting pipe production. Background Art

[0002] The production process of automobile air-conditioning connecting pipes includes cutting, chamfering, end-face forming, bending, ultrasonic cleaning, two-pass water washing, deoxidation cleaning, re-water washing, film formation, re-water washing, drying, welding, crimping, inspection, assembly and packaging. In order to improve the cleaning effect, an appropriate amount of degreaser needs to be added to the ultrasonic cleaning machine to remove surface oil stains. The ratio of degreaser to tap water is 1:20-30. This process will produce cleaning waste liquid; the aluminum tube after ultrasonic cleaning needs to be washed twice in the water washing tank to remove the residual degreaser on the surface. This process will produce water washing waste water; deoxidation cleaning requires the addition of cleaning agents to remove surface oxides. The ratio of cleaning agents to tap water is 1:20-30. This process will produce cleaning waste liquid; the aluminum tube after deoxidation cleaning needs to be washed in a water washing tank to remove residual cleaning agents. This process will produce water washing waste water; the aluminum tube after film passivation needs to be washed in a water washing tank to remove residual film-forming agents to produce water washing waste water.

[0003] At present, most of the wastewater produced by automobile air-conditioning connecting pipes is pretreated by flotation-anaerobic-aerobic-sedimentation process. This traditional treatment method has the disadvantages of low efficiency, high cost, poor treatment effect, and substandard emissions. Summary of the invention

[0004] The purpose of the present invention is to provide a pretreatment device for automobile air-conditioning connecting pipe production wastewater, which utilizes the hydrophilic flotation characteristics and strong oxidizing properties of ozone to oxidize and flotate to remove emulsified and suspended macromolecular pollutants in water; utilizes sulfate radicals generated in an acidic electrode environment to oxidize and remove pollutants; utilizes flocculants generated in an alkaline electrode environment to improve precipitation and separation efficiency; and simply and efficiently treats automobile air-conditioning connecting pipe production wastewater.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A pretreatment device for automobile air-conditioning connecting pipe production wastewater, characterized in that it includes a device main body, the device main body includes: a flotation chamber, an oxidation flotation chamber, an electro-oxidation chamber, an electro-flocculation chamber, a sedimentation separation chamber, a photocatalytic chamber, an aeration chamber, and a filtration chamber. The device main body is a cylindrical structure, and a conical structure is arranged at the bottom of the cylindrical structure. A plurality of rollers are arranged at the bottom of the device main body.

[0007] The oxidation flotation chamber is arranged below the flotation chamber, the electro-oxidation chamber is arranged below the oxidation flotation chamber, the electro-flocculation chamber is arranged below the electro-oxidation chamber, the sedimentation separation chamber is arranged below the electro-flocculation chamber, the photocatalysis chamber is arranged outside the electro-oxidation chamber and the electro-flocculation chamber, the photocatalysis chamber is arranged above the sedimentation separation chamber, the aeration chamber is arranged outside the flotation chamber and the oxidation flotation chamber, the aeration chamber is arranged above the photocatalysis chamber, the filter chamber is arranged outside the aeration chamber, and the filter chamber is arranged above the photocatalysis chamber.

[0008] Furthermore, the flotation chamber includes a water inlet pipe, a first aeration plate, a water distribution pipe, an oil scraper and an oil residue tank, the water inlet pipe is arranged at the center of the flotation chamber, the first aeration plate is arranged in the lower middle part of the flotation chamber, the water distribution pipe is arranged above the first aeration plate, the water distribution pipe is connected to the water inlet pipe, a first blower is arranged outside the flotation chamber, the first blower is connected to the first aeration plate through a pipeline, the oil scraper and the oil residue tank are arranged in the upper part of the flotation chamber, and the oil residue tank is arranged on the outside of the oil scraper.

[0009] The first aeration plate is a microporous aeration plate with micropores evenly arranged thereon, the water distribution pipe is arranged in a concentric circle shape or a cross shape, and a horizontal radiation water outlet is arranged on the water distribution pipe.

[0010] Furthermore, the oxidation flotation chamber includes an ozone aeration plate, which is arranged in the middle and lower part of the oxidation flotation chamber. An ozone blower and an ozone generator are arranged outside the oxidation flotation chamber. The ozone blower and the ozone generator are connected to the ozone aeration plate through a pipeline. The ozone aeration plate is a microporous aeration plate with micropores evenly arranged.

[0011] Furthermore, the electro-oxidation chamber includes an anode and mixed particles, the anode is horizontally arranged inside the electro-oxidation chamber, the anode is made of a stainless steel mesh, mixed particles are deposited on the anode, the mixed particles include calcium sulfite particles and iron oxide particles, and the mesh of the stainless steel mesh of the anode is smaller than the particle diameter of the mixed particles.

[0012] Furthermore, the electrocoagulation chamber includes a cathode and aluminum particles. The cathode is horizontally arranged inside the electrocoagulation chamber. The cathode is made of a stainless steel mesh. Aluminum particles are deposited on the cathode. The mesh of the stainless steel mesh of the cathode is smaller than the particle diameter of the aluminum particles.

[0013] Furthermore, the positive and negative electrodes of a power source are arranged outside the device body, and the positive and negative electrodes of the power source are connected to the anode and cathode respectively through wires.

[0014] Furthermore, the sedimentation separation chamber comprises a sedimentation discharge valve, the bottom of the sedimentation separation chamber is a conical structure, and the sedimentation discharge valve is arranged at the bottom of the sedimentation separation chamber.

[0015] Furthermore, the photocatalytic chamber comprises photocatalytic plates, which are staggeredly arranged inside the photocatalytic chamber, the upper surfaces of the photocatalytic plates are provided with photocatalysts, and the lower surfaces of the photocatalytic plates are installed with fluorescent lamps.

[0016] Furthermore, the aeration chamber includes a second aeration plate and a contact oxidation filler, the second aeration plate is arranged inside the aeration chamber, a second blower is arranged outside the aeration chamber, the second blower is connected to the second aeration plate through a pipeline, the second aeration plate is a microporous aeration plate with micropores evenly arranged, a contact oxidation filler basket is arranged above the second aeration plate, the contact oxidation filler basket is filled with contact oxidation filler, the contact oxidation filler is a hollow sphere, made of high molecular polymer injection molding, and has a built-in polyethylene flat wire.

[0017] Furthermore, the filter chamber comprises filter material and a water outlet. A filter material basket is provided inside the filter chamber. The filter material basket is filled with filter material, and the filter material is coarse sand. A water outlet is provided at the bottom of the filter chamber.

[0018] Advantages of the present invention:

[0019] 1. The present invention utilizes the strong oxidizing property of ozone and the hydrophilic property of gas to oxidatively decompose the macromolecular pollutants in emulsified and suspended states, and removes them by flotation, thus overcoming the defect of low efficiency of the existing flotation process.

[0020] 2. The following reaction occurs at the anode: 2H2O+4e-→O2↑+4H+. The acidic environment generated by the anode dissolves calcium sulfite and iron oxide to form sulfite and iron ions. Sulfite is oxidized to form sulfate free radicals, which strongly oxidize the pollutants in the wastewater, decomposing them. On the basis of ozone oxidation, the pollutants are oxidized and decomposed again, and the removal efficiency of large molecular pollutants is high.

[0021] 3. The following reaction occurs at the cathode: 2H2O+2e-→H2↑+2OH-. An alkaline environment is formed on the cathode surface of the electro-flocculation chamber, which dissolves the aluminum particles and forms aluminum hydroxide flocs, which have a flocculation effect on the wastewater, making it unnecessary to add flocculants in the subsequent precipitation and separation steps, thereby reducing the cost of sewage treatment.

[0022] 4. Photocatalytic degradation and aerobic oxidation further remove pollutants in sewage, while avoiding anaerobic odor and environmental pollution in wastewater.

[0023] 5. The present invention has a simple structure, is easy to install and operate, and has low manufacturing and operating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1A longitudinal cross-sectional view of the device of the present invention along the diameter of the cylindrical structure;

[0025] Figure 2 It is a schematic diagram of the structures of the air flotation chamber, the oxidation air flotation chamber and the electric oxidation chamber of the present invention;

[0026] Figure 3 It is a schematic diagram of the structure of the electric flocculation chamber, the precipitation separation chamber and the photocatalysis chamber of the present invention;

[0027] Figure 4 It is a schematic diagram of the structure of the aeration chamber and the filter chamber of the present invention;

[0028] Figure 5 A top view of the device of the present invention;

[0029] In the figure: 1, air flotation chamber, 101, water inlet pipe, 102, first aeration plate, 103, water distribution pipe, 104, oil scraper, 105, oil residue tank;

[0030] 2. Oxidation flotation chamber, 201, ozone aeration plate;

[0031] 3. Electro-oxidation chamber, 301, anode, 302, mixed particles;

[0032] 4. electrocoagulation chamber, 401, cathode, 402, aluminum particles;

[0033] 5. Sedimentation and separation chamber, 501, sediment discharge valve;

[0034] 6. Photocatalytic chamber, 601, photocatalytic plate;

[0035] 7. Aeration chamber, 701. Second aeration plate, 702. Contact oxidation filler;

[0036] 8. filter chamber, 801. filter material, 802. water outlet;

[0037] 9. Roller. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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 creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention.

[0039] like Figure 1and Figure 5 As shown, a pretreatment device for automobile air-conditioning connecting pipe production wastewater includes a device body, which includes: a flotation chamber 1, an oxidation flotation chamber 2, an electro-oxidation chamber 3, an electro-flocculation chamber 4, a sedimentation separation chamber 5, a photocatalytic chamber 6, an aeration chamber 7, and a filtration chamber 8. The device body is a cylindrical structure, and a conical structure is arranged at the bottom of the cylindrical structure. A plurality of rollers 9 are arranged at the bottom of the device body.

[0040] The oxidation flotation chamber 2 is arranged below the flotation chamber 1, the electro-oxidation chamber 3 is arranged below the oxidation flotation chamber 2, the electro-flocculation chamber 4 is arranged below the electro-oxidation chamber 3, the sedimentation separation chamber 5 is arranged below the electro-flocculation chamber 4, the photocatalytic chamber 6 is arranged on the outside of the electro-oxidation chamber 3 and the electro-flocculation chamber 4, the photocatalytic chamber 6 is arranged above the sedimentation separation chamber 5, the aeration chamber 7 is arranged on the outside of the flotation chamber 1 and the oxidation flotation chamber 2, the aeration chamber 7 is arranged above the photocatalytic chamber 6, the filter chamber 8 is arranged on the outside of the aeration chamber 7, and the filter chamber 8 is arranged above the photocatalytic chamber 6.

[0041] As a preferred embodiment of the present invention, Figure 2 As shown, the flotation chamber 1 includes a water inlet pipe 101, a first aeration plate 102, a water distribution pipe 103, an oil scraper 104 and an oil residue tank 105. The water inlet pipe 101 is arranged at the center of the flotation chamber 1, the first aeration plate 102 is arranged in the lower middle part of the flotation chamber 1, the water distribution pipe 103 is arranged above the first aeration plate 102, and the water distribution pipe 103 is connected to the water inlet pipe 101. A first blower is arranged outside the flotation chamber 1, and the first blower is connected to the first aeration plate 102 through a pipeline. The oil scraper 104 and the oil residue tank 105 are arranged in the upper part of the flotation chamber 1, and the oil residue tank 105 is arranged on the outside of the oil scraper 104.

[0042] The first aeration plate 102 is a microporous aeration plate with micropores evenly arranged thereon. The water distribution pipe 103 is arranged in a concentric circle shape or a cross shape. The water distribution pipe 103 is provided with a horizontal radiation water outlet.

[0043] The flotation chamber 1 utilizes the characteristics that the surface tension between oil and water is greater than the surface tension between oil and gas, and that oil is hydrophobic while gas is hydrophilic. Air is introduced into the sewage to make the oil particles adhere to the bubbles. When the density is lower than that of water, the oil particles float to the water surface to form a floating oil layer, which is then separated from the water by the oil scraper 104 and the oil residue tank 105, so that the oil pollutants are removed.

[0044] As a preferred embodiment of the present invention, the oxidation flotation chamber 2 includes an ozone aeration plate 201, which is arranged in the middle and lower part of the oxidation flotation chamber 2. An ozone blower and an ozone generator are arranged outside the oxidation flotation chamber 2. The ozone blower and the ozone generator are connected to the ozone aeration plate 201 through a pipeline. The ozone aeration plate 201 is a microporous aeration plate with micropores evenly arranged.

[0045] The degreasing agent, cleaning agent and film-forming agent in the wastewater are oxidized and decomposed into small molecular substances by ozone. At the same time, pollutants with a density less than 1 float up and are removed from the water by the oil scraper 104 and the oil residue tank 105.

[0046] As a preferred embodiment of the present invention, the electro-oxidation chamber 3 includes an anode 301 and mixed particles 302, wherein the anode 301 is horizontally arranged inside the electro-oxidation chamber 3, the anode 301 is made of a stainless steel mesh, and mixed particles 302 are deposited on the anode 301, wherein the mixed particles 302 include calcium sulfite particles and iron oxide particles, and the mesh of the stainless steel mesh of the anode 301 is smaller than the particle diameter of the mixed particles 302.

[0047] The wastewater flows into the electro-oxidation chamber 3, and the acidic environment generated on the surface of the anode 301 dissolves the calcium sulfite and iron oxide on the anode 301 to form sulfite and iron ions. The iron ions are oxidizing, and the sulfite is oxidized to form sulfate free radicals. The sulfate free radicals have a strong oxidizing effect on the pollutants in the wastewater, and the pollutants are oxidized and decomposed.

[0048] As a preferred embodiment of the present invention, Figure 3 As shown, the electrocoagulation chamber 4 includes a cathode 401 and aluminum particles 402. The cathode 401 is horizontally arranged inside the electrocoagulation chamber 4. The cathode 401 is made of a stainless steel mesh. Aluminum particles 402 are deposited on the cathode 401. The mesh of the stainless steel mesh of the cathode 401 is smaller than the particle diameter of the aluminum particles 402.

[0049] The wastewater flows into the electro-flocculation chamber 4, and an alkaline environment is formed on the surface of the cathode 401, which dissolves the aluminum particles and forms aluminum hydroxide flocs, which has a flocculation effect on the wastewater.

[0050] As a preferred embodiment of the present invention, the positive and negative electrodes of a power source are disposed outside the device body, and the positive and negative electrodes of the power source are connected to the anode 301 and the cathode 401 respectively through wires.

[0051] As a preferred embodiment of the present invention, the sedimentation separation chamber 5 includes a sedimentation discharge valve 501 . The bottom of the sedimentation separation chamber 5 is a conical structure. The sedimentation discharge valve 501 is arranged at the bottom of the sedimentation separation chamber 5 .

[0052] As a preferred embodiment of the present invention, the photocatalytic chamber 6 includes photocatalytic plates 601, which are staggered inside the photocatalytic chamber 6, the upper surface of the photocatalytic plates 601 is provided with photocatalysts, and the lower surface of the photocatalytic plates 601 is installed with fluorescent lamps.

[0053] The photocatalyst provided on the upper surface of the photocatalytic plate 601 is prepared in the following steps:

[0054] 1) Ferric chloride hexahydrate, fumaric acid and DMF were thoroughly mixed in a 100 mL polytetrafluoroethylene liner. After stirring at room temperature for 2 h, the mixture was heated at 110°C for 12 h. The resulting precipitate was centrifuged and washed with DMF and ethanol 5 times, and finally dried at 80°C for 12 h to obtain MIL-88A(Fe) powder.

[0055] 2) Dissolve bismuth nitrate pentahydrate in ethylene glycol, and completely dissolve bismuth nitrate pentahydrate by mechanical stirring and ultrasound. Then add a certain amount of potassium bromide, and add deionized water during mechanical stirring, stir until potassium bromide is completely dissolved, and react to generate BiOBr. Then add the MIL-88A (Fe) powder prepared in step 1, stir for 5 hours until the powder is completely dissolved, and react at 150 ° C for 12 hours. After cooling to room temperature, wash with alcohol and deionized water 5 times, and dry at 80 ° C for 12 hours to obtain a photocatalyst.

[0056] As a preferred embodiment of the present invention, in step 1, the molar mass ratio of ferric chloride hexahydrate to fumaric acid is 1:1;

[0057] As a preferred embodiment of the present invention, in step 2, the molar mass ratio of bismuth nitrate pentahydrate to potassium bromide is 1:2;

[0058] As a preferred embodiment of the present invention, in step 2, the mass ratio of the added MIL-88A(Fe) powder to BiOBr is 3:100.

[0059] As a preferred embodiment of the present invention, Figure 4 As shown, the aeration chamber 7 includes a second aeration plate 701 and a contact oxidation filler 702, wherein the second aeration plate 701 is arranged inside the aeration chamber 7, and a second blower is arranged outside the aeration chamber 7, and the second blower is connected to the second aeration plate 701 through a pipeline, and the second aeration plate 701 is a microporous aeration plate evenly provided with micropores, and a contact oxidation filler basket is arranged above the second aeration plate 701, and the contact oxidation filler basket is filled with the contact oxidation filler 702, and the contact oxidation filler 702 is a hollow sphere, which is made of high molecular polymer injection molding and has a built-in polyethylene flat wire.

[0060] As a preferred embodiment of the present invention, the filter chamber 8 includes filter material 801 and a water outlet 802. A filter material basket is provided inside the filter chamber 8. The filter material basket is filled with filter material 801. The filter material 801 is coarse sand. A water outlet 802 is provided at the bottom of the filter chamber 8. The water discharged from the water outlet 802 meets the standards and is discharged into the urban secondary sewage treatment plant for further treatment.

[0061] The working principle and specific process of the present invention:

[0062] 1) Wastewater enters the flotation chamber 1 through the water inlet pipe 101 and the water distribution pipe 103. The first aeration plate 102 located below the water distribution pipe 103 generates a large number of tiny bubbles. The bubbles adhere to the oil to form a mixture that rises to the water surface under the action of buoyancy. The floating oil is discharged through the oil scraper 104 and the oil residue tank 105.

[0063] 2) The water after flotation treatment enters the oxidation flotation chamber 2, and the oil and macromolecular degreasing agent, cleaning agent, and film-forming agent in the wastewater are oxidized and decomposed into small molecular substances by ozone. At the same time, pollutants with a density less than 1 float up and are scraped off by the oil scraper 104.

[0064] 3) Then the wastewater enters the electro-oxidation chamber 3, the power is turned on, the voltage is 36 volts, and the acidic environment generated on the surface of the anode 301 dissolves the calcium sulfite and iron oxide on the top thereof to form sulfite and iron ions. The iron ions are oxidizing. These two ions react in contact, and the sulfite is oxidized to form sulfate free radicals. The sulfate free radicals have a strong oxidizing effect on the pollutants in the wastewater, and the pollutants are decomposed.

[0065] 4) The wastewater enters the electrocoagulation chamber 4, and an alkaline environment is formed on the surface of the cathode 401, which dissolves the aluminum particles 402, forming aluminum hydroxide flocs, which have a flocculation effect on the wastewater.

[0066] 5) Then the wastewater enters the sedimentation separation chamber 5 for sedimentation separation, and the sediment is discharged through the sediment discharge valve 501. The wastewater after sedimentation separation enters the photocatalytic chamber 6, and the photocatalyst absorbs light to generate a photocatalytic reaction, and the pollutants are further decomposed.

[0067] 6) Then the wastewater enters the aeration chamber 7, the second aeration plate 701 aerates the wastewater, and an aerobic oxidation reaction occurs on the contact oxidation filler 702, and the pollutants are oxidized and decomposed.

[0068] 7) The wastewater then enters the filter chamber 8, where the filter material 801 filters the water. The filtered water is discharged through the outlet 802 and enters the city's secondary sewage treatment plant for further treatment.

[0069] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art can still adjust the technical solutions described in the above embodiments or replace some of the technical features by equivalents. Therefore, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these modifications and variations.

Claims

1. A pretreatment device for automobile air-conditioning connecting pipe production wastewater, characterized in that: The device comprises a device body, the device body comprising: an air flotation chamber (1), an oxidation air flotation chamber (2), an electro-oxidation chamber (3), an electro-flocculation chamber (4), a precipitation separation chamber (5), a photocatalytic chamber (6), an aeration chamber (7), and a filtration chamber (8); the device body is a cylindrical structure, a conical structure is arranged at the bottom of the cylindrical structure, and a plurality of rollers (9) are arranged at the bottom of the device body; The oxidation flotation chamber (2) is arranged below the flotation chamber (1), the electro-oxidation chamber (3) is arranged below the oxidation flotation chamber (2), the electro-flocculation chamber (4) is arranged below the electro-oxidation chamber (3), the sedimentation separation chamber (5) is arranged below the electro-flocculation chamber (4), the photocatalytic chamber (6) is arranged outside the electro-oxidation chamber (3) and the electro-flocculation chamber (4), the photocatalytic chamber (6) is arranged above the sedimentation separation chamber (5), the aeration chamber (7) is arranged outside the flotation chamber (1) and the oxidation flotation chamber (2), the aeration chamber (7) is arranged above the photocatalytic chamber (6), the filter chamber (8) is arranged outside the aeration chamber (7), and the filter chamber (8) is arranged above the photocatalytic chamber (6).

2. The automobile air-conditioning connecting pipe production wastewater pretreatment device according to claim 1 is characterized by: The flotation chamber (1) comprises a water inlet pipe (101), a first aeration plate (102), a water distribution pipe (103), an oil scraper (104) and an oil residue tank (105); the water inlet pipe (101) is arranged at the center of the flotation chamber (1); the first aeration plate (102) is arranged at the middle and lower part of the flotation chamber (1); the water distribution pipe (103) is arranged above the first aeration plate (102); the water distribution pipe (103) is connected to the water inlet pipe (101); a first blower is arranged outside the flotation chamber (1); the first blower is connected to the first aeration plate (102) through a pipeline; the oil scraper (104) and the oil residue tank (105) are arranged at the upper part of the flotation chamber (1); and the oil residue tank (105) is arranged on the outer side of the oil scraper (104); The first aeration plate (102) is a microporous aeration plate with micropores evenly arranged thereon, the water distribution pipe (103) is arranged in a concentric circle shape or a cross shape, and a horizontal radiating water outlet is arranged on the water distribution pipe (103).

3. The automobile air-conditioning connecting pipe production wastewater pretreatment device according to claim 2 is characterized by: The oxidation flotation chamber (2) comprises an ozone aeration plate (201), the ozone aeration plate (201) being arranged at the middle and lower part of the oxidation flotation chamber (2), an ozone blower and an ozone generator being arranged outside the oxidation flotation chamber (2), the ozone blower and the ozone generator being connected to the ozone aeration plate (201) via a pipeline, and the ozone aeration plate (201) being a microporous aeration plate evenly provided with micropores.

4. The automobile air-conditioning connecting pipe production wastewater pretreatment device according to claim 3 is characterized by: The electro-oxidation chamber (3) comprises an anode (301) and mixed particles (302); the anode (301) is horizontally arranged inside the electro-oxidation chamber (3); the anode (301) is made of a stainless steel mesh; mixed particles (302) are deposited on the anode (301); the mixed particles (302) comprise calcium sulfite particles and iron oxide particles; and the mesh of the stainless steel mesh of the anode (301) is smaller than the particle diameter of the mixed particles (302).

5. The automobile air-conditioning connecting pipe production wastewater pretreatment device according to claim 4 is characterized by: The electro-flocculation chamber (4) comprises a cathode (401) and aluminum particles (402); the cathode (401) is horizontally arranged inside the electro-flocculation chamber (4); the cathode (401) is made of a stainless steel mesh; the aluminum particles (402) are deposited on the cathode (401); and the mesh of the stainless steel mesh of the cathode (401) is smaller than the particle diameter of the aluminum particles (402).

6. The automobile air-conditioning connecting pipe production wastewater pretreatment device according to claim 5 is characterized by: The positive and negative electrodes of a power source are arranged outside the device body, and the positive and negative electrodes of the power source are respectively connected to the anode (301) and the cathode (401) through wires.

7. The automobile air-conditioning connecting pipe production wastewater pretreatment device according to claim 6 is characterized by: The sedimentation separation chamber (5) comprises a sedimentation discharge valve (501), the bottom of the sedimentation separation chamber (5) is a conical structure, and the sedimentation discharge valve (501) is arranged at the bottom of the sedimentation separation chamber (5).

8. The automobile air-conditioning connecting pipe production wastewater pretreatment device according to claim 7 is characterized by: The photocatalytic chamber (6) comprises a photocatalytic plate (601), wherein the photocatalytic plates (601) are arranged in a staggered manner inside the photocatalytic chamber (6), a photocatalyst is arranged on the upper surface of the photocatalytic plate (601), and a fluorescent lamp is installed on the lower surface of the photocatalytic plate (601).

9. The automobile air-conditioning connecting pipe production wastewater pretreatment device according to claim 8, characterized in that: The aeration chamber (7) comprises a second aeration plate (701) and a contact oxidation filler (702); the second aeration plate (701) is arranged inside the aeration chamber (7); a second blower is arranged outside the aeration chamber (7); the second blower is connected to the second aeration plate (701) through a pipeline; the second aeration plate (701) is a microporous aeration plate evenly provided with micropores; a contact oxidation filler basket is arranged above the second aeration plate (701); the contact oxidation filler basket is filled with the contact oxidation filler (702); the contact oxidation filler (702) is in the shape of a hollow sphere, is made of high molecular polymer injection molding, and has a polyethylene flat wire built in.

10. The automobile air-conditioning connecting pipe production wastewater pretreatment device according to claim 9, characterized in that: The filter chamber (8) comprises filter material (801) and a water outlet (802); a filter material basket is arranged inside the filter chamber (8); the filter material basket is filled with filter material (801); the filter material (801) is coarse sand; and a water outlet (802) is arranged at the bottom of the filter chamber (8).

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