New energy automobile aluminum shell cleaning wastewater pretreatment system

Abstract

The utility model relates to the technical field of wastewater treatment, in particular to a new energy automobile aluminum shell cleaning wastewater pretreatment system. The system comprises a wastewater collection pool, an oil-water separation device, an organic matter treatment device and separation equipment. Wherein the oil-water separation device comprises a ferrous reaction chamber and a demulsification reaction chamber, the ferrous reaction chamber contains a ferrous solution, and the demulsification reaction chamber contains a demulsifier; the organic matter treatment device comprises a plurality of Fenton reaction tanks and anaerobic jars, the Fenton reaction tanks contain hydrogen peroxide, sulfuric acid and ferrous iron, and the anaerobic jars contain anaerobic microorganisms; the separation equipment comprises a plurality of coagulation and flocculation tanks, an air floatation tank and a sedimentation tank, the coagulation and flocculation tanks can be used for cleaning pollutants in wastewater, the air floatation tank can be used for removing scum in the cleaning wastewater, and the sedimentation tank can be used for separating sediments in the cleaning wastewater. According to the system, grease, organic matters and suspended matters in the wastewater are effectively removed through multi-stage treatment, the wastewater treatment efficiency is improved, and the environmental pollution is reduced.

Description

Technical Field

[0001] This application relates to the field of wastewater treatment technology, and in particular to a pretreatment system for wastewater from cleaning aluminum shells of new energy vehicles. Background Technology

[0002] With the rapid development of the new energy vehicle industry, the treatment of aluminum casing cleaning wastewater generated by battery manufacturing and equipment (M&E) plants has become increasingly prominent. This type of wastewater contains high concentrations of ether-based water-based cleaning agents, oil, and aluminum ions, and the pollutants are mostly in an emulsified state, making treatment difficult. Traditional biological treatment methods are ineffective in such high-concentration pollutant environments; therefore, developing efficient and targeted wastewater treatment technologies has become a current research hotspot.

[0003] Currently, conventional methods for treating wastewater from cleaning aluminum shells of new energy vehicles mainly rely on biological treatment processes. However, when the concentration of pollutants is high, especially when they are emulsified, such as those containing ether-based water-based cleaning agents and oil, the activity of microorganisms is severely limited, resulting in treatment effects that cannot meet expectations. In addition, existing technologies also suffer from problems such as complex processes and cumbersome operations. Utility Model Content

[0004] The purpose of this application is to overcome the above-mentioned technical problems and provide a pretreatment system for aluminum shell cleaning wastewater from new energy vehicles.

[0005] A pretreatment system for wastewater from cleaning aluminum shells of new energy vehicles, comprising:

[0006] Wastewater collection pond, used to collect cleaning wastewater;

[0007] An oil-water separation device includes a demulsification tank, which includes a ferrous reaction chamber and a demulsification reaction chamber. The ferrous reaction chamber is connected to the demulsification reaction chamber. The ferrous reaction chamber contains a ferrous solution, and the demulsification reaction chamber contains a demulsifier. The cleaning wastewater in the cleaning wastewater collection tank can flow into the ferrous reaction chamber.

[0008] An organic matter treatment device includes multiple Fenton reaction tanks and an anaerobic tank. Washing wastewater from the demulsification reaction chamber flows into the Fenton reaction tanks, which contain hydrogen peroxide, sulfuric acid, and ferrous sulfate. The anaerobic tanks receive the treated washing wastewater from the Fenton reaction tanks and contain anaerobic microorganisms.

[0009] The separation equipment includes multiple coagulation and flocculation tanks, dissolved air flotation (DAF) tanks, and sedimentation tanks. The DAF tanks remove scum from the cleaning wastewater, and the sedimentation tanks separate sediment from the cleaning wastewater. Both the demulsification tank and the Fenton reactor are connected to the DAF tanks. The DAF tank is located between the demulsification tank and the DAF tank and is connected to the corresponding DAF tank. The DAF tank is also connected to the Fenton reactor. The sedimentation tank is located between the Fenton reactor and the anaerobic digester and is connected to the corresponding DAF tank. The sedimentation tank is also connected to the anaerobic digester. After passing through the demulsification tank, the cleaning wastewater passes through the DAF tank and then the DAF tank before entering the Fenton reactor. After passing through the Fenton reactor, the cleaning wastewater is treated again by the DAF tank and the sedimentation tank before finally entering the anaerobic digester.

[0010] By adopting the above scheme, the solution in the demulsification tank reacts with the cleaning wastewater, separating the oil and water in the cleaning wastewater. The solution in the Fenton reaction tank undergoes a Fenton reaction with the cleaning wastewater, thereby removing the organic matter present in the wastewater. The anaerobic tank further converts organic acids and alcohols into methane and carbon dioxide through the metabolism of anaerobic organisms, so that the organic matter in the wastewater is removed in the form of methane and carbon dioxide, thereby reducing the chemical oxygen demand in the wastewater.

[0011] In one embodiment, the ferrous reaction chamber, the demulsification reaction chamber, and each of the Fenton reaction tanks are each provided with a corresponding pH adjustment tank.

[0012] By adopting the above scheme, the pH adjustment tank can adjust the pH value of the cleaning wastewater, thereby disrupting the stability of pollutants in the cleaning wastewater and facilitating the reaction between the cleaning wastewater and the solutions in the demulsification tank and Fenton reaction tank.

[0013] In one embodiment, the pretreatment system for wastewater from cleaning aluminum shells of new energy vehicles also includes multiple reagent tanks, each containing different reaction reagents. The reagent tanks are connected to the demulsification tank, Fenton reaction tank, coagulation and flocculation tank, and pH adjustment tank, respectively.

[0014] By adopting the above scheme, the corresponding reaction reagents can be injected into the demulsification tank, Fenton reaction tank, and coagulation flocculation tank.

[0015] In one embodiment, the demulsification tank, Fenton reaction tank, coagulation and flocculation tank, and pH adjustment tank are all equipped with stirring devices.

[0016] By adopting the above scheme, the stirring device can make the reaction reagents injected into the tank more evenly mixed.

[0017] In one embodiment, both the demulsification tank and the Fenton reaction tank are provided with an outlet. The pH adjustment tank corresponding to the ferrous reaction chamber has a lower outlet at its bottom. The pH adjustment tank located between the ferrous reaction chamber and the demulsification reaction chamber has an upper outlet at its top that communicates with the ferrous reaction chamber. The ferrous reaction chamber has an upper outlet at its top that communicates with the coagulation and flocculation tank. The pH adjustment tank that communicates with the Fenton reaction tank has a lower outlet at its bottom that communicates with the Fenton reaction tank and an upper outlet at its top that communicates with the coagulation and flocculation tank.

[0018] By adopting the above scheme, the liquid level inside the pH reaction tank can be kept level with the liquid levels in the corresponding demulsification tank and Fenton reaction tank, so that the pH adjustment process can be carried out simultaneously with the demulsification reaction and the Fenton reaction, which increases the treatment efficiency of the cleaning wastewater. The cleaning wastewater after the reaction flows out through the upper outlet, so as to carry out the next reaction process.

[0019] In one embodiment, the flotation tank and sedimentation tank are all connected to the coagulation and flocculation tank through an upper liquid outlet, and a guide plate is provided at the top of the sedimentation tank, with the guide plate close to the upper liquid outlet.

[0020] By adopting the above scheme, the cleaning wastewater after coagulation and flocculation can overflow directly into the flotation tank and sedimentation tank through the upper outlet as the liquid level rises. The sediment in the sedimentation tank is located at the bottom. When the cleaning wastewater treated by the coagulation and flocculation tank flows out through the upper outlet, the cleaning wastewater will impact the surface of the sediment during the outflow process, thereby stirring up the sludge that has settled at the bottom and making the sludge resuspend in the water. By setting up a guide plate, the cleaning wastewater can flow down along the side wall of the sedimentation tank and the guide plate, avoiding the cleaning wastewater directly impacting the surface of the sediment.

[0021] In one embodiment, the sedimentation tank has a sludge discharge port at the bottom, and the bottom of the sedimentation tank is a frustum shape with the bottom surface facing upward. A transfer tank is provided on one side of the sedimentation tank, and the top of the sedimentation tank and the transfer tank are connected, with an outlet weir plate provided at the connection point.

[0022] By adopting the above scheme, the bottom of the sedimentation tank is designed as a truncated pyramid with the bottom surface facing upwards. The settled sludge can flow into the sludge discharge port at the bottom of the sedimentation tank through the inclined surface of the truncated pyramid. The effluent weir plate installed at the top of the sedimentation tank where it connects with the transfer tank can control the water flow speed and prevent the water flow velocity from disturbing the sedimentation inside the sedimentation tank. At the same time, it can block impurities on the water surface.

[0023] In one embodiment, the top of the sedimentation tank is also provided with a scum trough, the extension direction of the scum trough is the same as the extension direction of the weir plate, the bottom plate of the scum trough is inclined, and the extended end of the bottom plate of the scum trough is connected to a scum discharge port.

[0024] By adopting the above scheme, when the liquid in the sedimentation tank is discharged through the part where the effluent weir is located, the water flow will pass through the scum trough. The scum on the surface of the liquid will be blocked by the scum trough and gather at the bottom of the scum trough. Under the action of gravity, the scum will settle to the bottom of the scum trough and then flow along the bottom of the scum trough, thus being discharged from the scum outlet.

[0025] In one embodiment, the transfer tank and the anaerobic tank are connected by a water supply pipe, and the water supply pipe is equipped with a heat tracing device.

[0026] By adopting the above scheme, the liquid entering the anaerobic tank can be controlled at a temperature suitable for the survival of anaerobic microorganisms through the heat tracing device, thus avoiding the liquid entering the anaerobic tank from affecting the activity of anaerobic microorganisms.

[0027] In one embodiment, multiple float switches are installed in the wastewater collection tank and the transfer tank, and the float switches correspond to multiple different liquid levels.

[0028] By adopting the above scheme, when the liquid level in the wastewater collection tank and the transfer tank is too high, the float valve can control the wastewater collection tank and the transfer tank to stop water intake, and when the liquid level in the wastewater collection tank and the transfer tank is too low, the float switch controls the wastewater collection tank and the transfer tank to intake.

[0029] In summary, this application includes at least one of the following beneficial technical effects:

[0030] 1. The solution in the demulsification tank reacts with the cleaning wastewater, separating the oil and water. The solution in the Fenton reaction tank undergoes a Fenton reaction with the cleaning wastewater, removing organic matter. The anaerobic tank, through the metabolism of anaerobic organisms, further converts organic acids and alcohols into methane and carbon dioxide, removing organic matter in the wastewater in the form of methane and carbon dioxide, thereby reducing the chemical oxygen demand (COD) of the wastewater. Through the oil-water separation device and separation equipment, emulsified pollutants such as ether-based water-based cleaning agents and oil in the cleaning wastewater can be removed without affecting the activity of microorganisms, thus achieving better treatment results.

[0031] 2. The design of the upper and lower liquid outlets ensures that the liquid level inside the pH reaction tank remains level with the liquid levels in the corresponding demulsification tank and Fenton reaction tank, allowing the pH adjustment process to proceed simultaneously with the demulsification and Fenton reactions. This increases the treatment efficiency of the cleaning wastewater. As the liquid level rises, the treated cleaning wastewater flows out through the upper liquid outlet, ready for the next reaction step.

[0032] 3. When the cleaning wastewater treated by the coagulation and flocculation tank flows out through the upper outlet, the cleaning wastewater will impact the surface of the sediment during the outflow process, thereby stirring up the sludge that has settled at the bottom and making the sludge resuspend in the water. By setting up the guide plate and scum trough, the cleaning wastewater can flow down along the side wall of the sedimentation tank and the guide plate, avoiding the cleaning wastewater directly impacting the surface of the sediment. The scum that has not settled on the liquid surface will be blocked by the scum trough and accumulate at the bottom of the scum trough. Under the action of gravity, it flows along the bottom of the scum trough and is discharged from the scum outlet. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the structure of a pretreatment system for aluminum shell cleaning wastewater from new energy vehicles provided in this application.

[0034] Figure 2 This is a schematic diagram showing the connection between the demulsification tank and the flotation tank.

[0035] Figure 3 This is a schematic diagram showing the connection between the Fenton reactor and the sedimentation tank.

[0036] Figure 4 This is a schematic diagram showing the connection between the sedimentation tank and the anaerobic tank.

[0037] Explanation of reference numerals in the attached drawings: 1. Wastewater collection tank; 2. Oil-water separation device; 21. Demulsification tank; 211. Ferrous iron reaction chamber; 212. Demulsification reaction chamber; 3. Organic matter treatment device; 31. Fenton reaction tank; 32. Anaerobic tank; 4. Separation equipment; 41. Coagulation and flocculation tank; 42. Air flotation tank; 43. Sedimentation tank; 431. Baffle plate; 432. Sludge discharge port; 433. Effluent weir plate; 434. Scum trough; 4341. Scum discharge port; 435. Transfer tank; 436. Water supply pipe; 4361. Heating device; 5. pH adjustment tank; 6. Chemical tank; 7. Stirring device; 8. Liquid outlet; 81. Upper liquid outlet; 82. Lower liquid outlet; 9. Float switch. Detailed Implementation

[0038] Therefore, it is necessary to provide a pretreatment system for wastewater from cleaning aluminum shells of new energy vehicles.

[0039] Please see Figure 1 , Figure 1 The present application provides a structural schematic diagram of a pretreatment system for aluminum shell cleaning wastewater from new energy vehicles, which includes a wastewater collection tank 1, an oil-water separation tank, an organic matter treatment device 3, a separation device 4, and multiple reagent tanks 6, wherein each reagent tank 6 contains different reaction reagents.

[0040] Please refer to the following: Figure 2 , Figure 2This diagram illustrates the connection between the demulsification tank and the flotation tank. Wastewater collection tank 1 collects cleaning wastewater. The oil-water separation device 2 includes a demulsification tank 21, which is divided into a ferrous reaction chamber 211 and a demulsification reaction chamber 212, connected by pipes. The ferrous reaction chamber 211 contains a ferrous solution, primarily used to break down emulsified oil droplets in the wastewater, making them easier to separate from the water. A demulsifier is added to the demulsification reaction chamber 212 to further promote oil-water separation. The design of these two reaction chambers allows for more thorough separation of oil from the wastewater, thereby reducing the pressure on subsequent treatment processes. The main components of the ferrous reaction chamber 211 include a ferrous solution storage tank and a feed pump.

[0041] Ferrous solution is injected into the ferrous reaction chamber 211 via a feed pump from a reagent tank 6 containing ferrous solution. The ferrous solution can be ferrous sulfate solution or other solutions containing ferrous ions. The feed pump delivers the ferrous solution into the reaction chamber in a specific ratio, and the flow rate can be adjusted according to actual conditions. Additionally, a stirrer can be installed in the ferrous reaction chamber 211 to ensure thorough mixing of the ferrous solution and wastewater. Demulsification reaction chamber 212 is injected into the demulsifier reaction chamber 212 via a feed pump from a reagent tank 6 containing demulsifier. The choice of demulsifier should be determined based on the specific composition of the wastewater; common demulsifiers include polyacrylamide (PAM) and anionic surfactants. The feed pump must also have precise metering capabilities, and a stirrer can also be installed in the demulsification reaction chamber 212 to improve the demulsification effect.

[0042] Both the ferrous reaction chamber 211 and the demulsification reaction chamber 212 are equipped with pH adjustment tanks 5. The pH adjustment tank 5 corresponding to the ferrous reaction chamber 211 contains liquid acid. A dosing pump injects the liquid acid from a reagent tank 6 into the pH adjustment tank 5. The bottom of the pH adjustment tank 5 corresponding to the ferrous reaction chamber has a lower outlet 82 for connection with the ferrous reaction chamber, thus maintaining the same liquid level in the pH adjustment tank 5 as in the ferrous reaction chamber. The pH adjustment tank 5 adjusts the pH of the cleaning wastewater to approximately 3.0 before injecting the ferrous solution. Ferrous ions can demulsify under acidic conditions. Ferrous ions can reduce the surface charge of emulsified oil droplets through a charge neutralization mechanism, reducing the electrostatic repulsion between oil droplets and promoting their aggregation. Simultaneously, the substances formed after the hydrolysis of ferrous ions can also act as flocculators, aggregating tiny oil droplets and other suspended particles into larger particles, preparing for subsequent separation.

[0043] The ferrous reaction chamber 211 is equipped with a liquid outlet 8, which includes an upper outlet 81 and a lower outlet 82. The upper outlet 81 connects the ferrous reaction chamber 211 to the pH adjustment tank 5 corresponding to the demulsification reaction chamber 212. As the liquid level inside the ferrous reaction chamber 211 rises, the cleaning wastewater treated in the ferrous reaction chamber 211 enters the pH adjustment tank 5 corresponding to the demulsification reaction chamber 212 through the upper outlet 81. The pH adjustment tank 5 contains liquid alkali, which is injected into the pH adjustment tank 5 by a dosing pump from a reagent tank 6. The pH adjustment tank 5 has a lower outlet 82 at the bottom that connects to the demulsification reaction chamber 212. The pH adjustment tank 5 adjusts the cleaning wastewater to a slightly alkaline pH, causing aluminum ions in the wastewater to precipitate as aluminum hydroxide. Aluminum hydroxide has a large specific surface area and adsorption capacity, which can adsorb some small oil droplets and impurities in the wastewater, further promoting the aggregation and separation of oil droplets. Then, a special demulsifier for emulsions is injected. The demulsifier can further break down the interfacial film of the emulsified oil, causing the dissolved oil in the water to precipitate out, thus achieving a more thorough separation of oil and water.

[0044] Please refer to the following: Figure 3 , Figure 3 This diagram illustrates the connection between the Fenton reactor and the sedimentation tank. The organic matter treatment device 3 includes multiple Fenton reactors 31 and an anaerobic tank 32. The Fenton reactors 31 are interconnected. Each Fenton reactor 31 is injected with hydrogen peroxide, sulfuric acid, and ferrous oxide through a chemical tank 6 and a dosing pump. Under acidic conditions, ferrous oxide and hydrogen peroxide undergo a Fenton reaction, generating highly oxidizing hydroxyl radicals. These hydroxyl radicals oxidize organic matter in the wastewater, degrading large organic molecules into smaller ones, and even further mineralizing them into carbon dioxide and water, thereby significantly reducing the chemical oxygen demand (COD) of the wastewater. The bottom of each Fenton reactor 31 has a lower outlet 82 connected to a pH adjustment tank 5. The pH adjustment tank 5, which works in conjunction with the Fenton reactors 31, is injected with liquid alkali through a chemical tank 6 and a dosing pump to adjust the pH of the treated cleaning wastewater to neutral for subsequent treatment. Anaerobic tank 32 contains anaerobic microorganisms, which further convert organic acids and alcohols into methane and carbon dioxide through the metabolism of anaerobic organisms, thereby reducing the chemical oxygen demand (COD) of wastewater. Separation equipment 4 includes multiple coagulation and flocculation tanks 41, flotation tanks 42, and sedimentation tanks 43. The coagulation and flocculation tanks 41 include multiple tanks, each corresponding to a demulsification tank 21 and a Fenton reaction tank 31. Each coagulation and flocculation tank 41 includes a coagulation reaction tank and a flocculation reaction tank connected at the bottom via a lower outlet 82.

[0045] The coagulation and flocculation tank 41, corresponding to the demulsification tank 21, is connected to the demulsification reaction chamber 212 via an upper outlet 81. The flocculation reaction tank is also connected to the flotation tank 42 via an upper outlet 81. PAC (polyaluminum chloride) is injected into the coagulation reaction tank through a reagent tank 6, and PAM (polyacrylamide) is injected into the flocculation reaction tank through the reagent tank 6. PAC is an inorganic polymeric coagulant that hydrolyzes in water to form polynuclear hydroxyl complexes. Through double-layer compression, adsorption neutralization, and adsorption bridging, it destabilizes fine suspended particles and colloidal particles in wastewater, forming micro-flocs. PAM is a polymeric flocculant that can connect micro-flocs through its long-chain structure to form larger flocs, enhancing the flocculation effect and making the flocs easier to settle or float.

[0046] The wastewater treated in demulsification tank 21, after coagulation and flocculation, flows into dissolved air flotation tank 42. In dissolved air flotation tank 42, tiny bubbles in the dissolved air water carry the precipitated oil and scum to the surface, where a skimmer removes them. Dissolved air water is produced by dissolving air in water under pressure, then suddenly reducing the pressure upon entering the flotation tank 42, causing the dissolved air to precipitate as tiny bubbles. These bubbles adhere to the oil and scum in the wastewater, and due to buoyancy, they carry the oil and scum to the surface, thus separating them from the wastewater.

[0047] The coagulation and flocculation tank 41, corresponding to the Fenton reaction tank 31, is connected to the pH adjustment tank 5 of the coagulation reaction tank 31 via the upper outlet 81. The flocculation reaction tank and the sedimentation tank 43 are connected via the upper outlet 81. Calcium chloride is injected into the coagulation reaction tank through the chemical tank 6 and the chemical pump, while PAM (polyacrylamide) is injected into the flocculation reaction tank through the chemical tank 6 and the chemical pump. Calcium ions in the calcium chloride react with phosphate ions in the wastewater to form calcium phosphate precipitate, thereby removing phosphorus from the wastewater. The role of PAM is to further flocculate the generated calcium phosphate precipitate and other fine particles into larger flocs, facilitating subsequent sedimentation and separation.

[0048] In this application, the demulsification tank 21, Fenton reaction tank 31, coagulation and flocculation tank 41, and pH adjustment tank 5 are all equipped with motor-driven stirring devices 7. The stirring devices 7 help the demulsifier diffuse more quickly to all parts of the wastewater, promoting oil-water separation. In the Fenton reaction tank 31, the stirring devices 7 ensure that hydrogen peroxide and sulfuric acid are evenly distributed in the wastewater, accelerating the oxidation reaction. In the coagulation and flocculation tank 41, the stirring devices 7 help form larger flocs, improving flocculation efficiency. The stirring devices 7 also ensure that the reaction reagents injected into the reagent tank 6 are mixed more evenly, allowing each solution to react fully.

[0049] The main components of the sedimentation tank 43 include a baffle plate 431, a sludge discharge port 432, and an effluent weir plate 433. The cleaning wastewater, after coagulation and flocculation, can overflow directly into the flotation tank 42 and the sedimentation tank 43 through the upper outlet 81 as the liquid level rises. The sediment in the sedimentation tank 43 is located at the bottom. When the cleaning wastewater treated by the coagulation and flocculation tank 41 flows out through the upper outlet 81, the wastewater impacts the surface of the sediment, thus agitating the sludge that has settled at the bottom and resuspending it in the water. By setting the baffle plate 431, the cleaning wastewater can flow down along the side wall of the sedimentation tank 43 and the baffle plate 431, preventing the wastewater from directly impacting the surface of the sediment.

[0050] The sludge discharge port 432 is located at the bottom of the sedimentation tank 43, which has a truncated pyramidal bottom facing upwards, facilitating the concentrated discharge of sludge. A transfer tank 435 is located on one side of the sedimentation tank 43, and an effluent weir 433 is positioned at the connection between the sedimentation tank 43 and the transfer tank 435 to control the water flow rate and prevent disturbance of the sediment within the sedimentation tank 43. A scum trough 434 is also located at the top of the sedimentation tank 43. The bottom plate of the scum trough 434 is inclined, and the extended end of the bottom plate connects to a scum discharge port 4341. When liquid in the sedimentation tank 43 is discharged through the effluent weir 433, the water flow passes through the scum trough 434. The scum on the liquid surface is blocked by the scum trough 434 and accumulates at the bottom of the scum trough 434. Under the influence of gravity, the scum flows along the bottom of the scum trough 434 and is discharged from the scum discharge port 4341.

[0051] Please refer to the following: Figure 4 , Figure 4 This diagram illustrates the connection between the sedimentation tank and the anaerobic tank. The transfer tank 435 and the anaerobic tank 32 are connected via a water supply pipe 436. The water supply pipe 436 is equipped with a heating device 4361, which adjusts the temperature of the wastewater entering the anaerobic tank 32 to a suitable level for the anaerobic microorganisms, preventing the liquid entering the anaerobic tank 32 from affecting the activity of the microorganisms. The top of the anaerobic tank 32 is equipped with a gas-liquid separator 4. Because the microorganisms in the anaerobic tank 32 decompose and utilize the organic matter in the wastewater as nutrients through metabolism, converting it into gases such as methane and carbon dioxide, and because the wastewater contains water, the gas-liquid separator 4 can separate the water from the gas, thus making the gas discharged from the anaerobic tank 32 purer. In this application, the wastewater collection tank 1 and the transfer tank 435 are equipped with multiple float switches 9, each corresponding to a different liquid level. When the wastewater level reaches a high level, the signal emitted by the cable float can automatically close the inlet valve or stop the inlet pump to prevent the wastewater collection tank 1 from overflowing. Conversely, when the liquid level drops to the low liquid level set point, the cable float can send a signal to open the inlet valve or start the inlet water pump, ensuring that the wastewater collection tank 1 can continuously collect wastewater.

[0052] The working principle of this application is as follows: After the wastewater collection tank 1 collects the cleaning wastewater from the aluminum shell of the car, the wastewater flows into the demulsification tank 21 through pipelines and a booster pump. The pH adjustment tank 5 adjusts the cleaning wastewater in the demulsification tank 21 to the optimal level, so that the demulsification tank 21 can effectively precipitate the oil in the cleaning wastewater. The coagulation and flocculation tank 41 corresponding to the demulsification tank 21 aggregates the precipitated oil to form flocs. Then, the cleaning wastewater flows into the dissolved air flotation tank 42. The dissolved air flotation tank 42 uses tiny bubbles in the dissolved air water to carry the water... Oil and scum precipitated from the wastewater rise to the surface, where they are scraped off by a surface scraper. The wastewater then flows into the Fenton reactor 31, where the Fenton reaction initially removes organic matter. After the pH adjustment tank 5 adjusts the pH to neutral, the wastewater flows into the coagulation and flocculation tank 41, corresponding to the Fenton reactor 31, to remove phosphorus. The wastewater then flows into the sedimentation tank 43, where, due to the higher density of the flocs than water, they sink to the bottom under gravity, forming sludge. The sludge enters the physicochemical sludge tank of the wastewater treatment plant, while the relatively clear water at the top is temporarily stored in the transfer tank 435. Finally, the wastewater flows into the anaerobic tank 32, where anaerobic microorganisms decompose and utilize the organic matter as nutrients through metabolism, converting it into gases such as methane and carbon dioxide, thus significantly reducing the chemical oxygen demand (COD) of the wastewater.

[0053] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A new energy vehicle aluminum shell cleaning wastewater pretreatment system, characterized in that, include: Wastewater collection tank (1) is used to collect cleaning wastewater; The oil-water separation device (2) includes a demulsification tank (21), which includes a ferrous reaction chamber (211) and a demulsification reaction chamber (212). The ferrous reaction chamber (211) is connected to the demulsification reaction chamber (212). The ferrous reaction chamber (211) contains a ferrous solution, and the demulsification reaction chamber (212) contains a demulsifier. The cleaning wastewater in the cleaning wastewater collection tank (1) can flow into the ferrous reaction chamber (211). The organic matter treatment device (3) includes multiple Fenton reaction tanks (31) and anaerobic tanks (32). The cleaning wastewater in the demulsification reaction chamber (212) can flow into the Fenton reaction tanks (31). The Fenton reaction tanks (31) contain hydrogen peroxide, sulfuric acid and ferrous sulfate. The anaerobic tanks (32) can receive the cleaning wastewater after it has been treated by the Fenton reaction tanks (31). The anaerobic tanks (32) contain anaerobic microorganisms. The separation device (4) includes multiple coagulation and flocculation tanks (41), flotation tanks (42), and sedimentation tanks (43). The flotation tanks (42) can remove scum from the cleaning wastewater, and the sedimentation tanks (43) can separate sediment from the cleaning wastewater. The demulsification tank (21) and the Fenton reaction tank (31) are both connected to the coagulation and flocculation tanks (41). The flotation tank (42) is located between the demulsification tank (21) and the flotation tank (42) and is connected to the coagulation and flocculation tank (41) corresponding to the demulsification tank (21). The flotation tank (42) is also connected to the Fenton reaction tank (31). The sedimentation tank (43) is located between the Fenton reaction tank (31) and the anaerobic tank (32) and is connected to the coagulation and flocculation tank (41) corresponding to the Fenton reaction tank (31). The sedimentation tank (43) is also connected to the anaerobic tank (32). After the washing wastewater passes through the demulsification tank (21), it passes through the coagulation and flocculation tank (41) and the flotation tank (42) before entering the Fenton reaction tank (31). After passing through the Fenton reaction tank (31), the washing wastewater is treated by the coagulation and flocculation tank (41) and the sedimentation tank (43) before finally entering the anaerobic tank (32).

2. The new energy vehicle aluminum shell cleaning wastewater pretreatment system according to claim 1, characterized in that: Each of the ferrous reaction chamber (211), the demulsification reaction chamber (212), and each of the Fenton reaction tanks (31) is provided with a corresponding pH adjustment tank (5).

3. The new energy vehicle aluminum shell cleaning wastewater pretreatment system according to claim 2, characterized in that: The new energy vehicle aluminum shell cleaning wastewater pretreatment system also includes multiple reagent tanks (6), each reagent tank (6) is filled with different reaction reagents, and the reagent tanks (6) are respectively connected to the demulsification tank (21), Fenton reaction tank (31), coagulation and flocculation tank (41) and pH adjustment tank (5).

4. The new energy vehicle aluminum shell cleaning wastewater pretreatment system according to claim 3, characterized in that: The demulsification tank (21), Fenton reaction tank (31), coagulation and flocculation tank (41) and pH adjustment tank (5) are all equipped with stirring devices (7).

5. The new energy vehicle aluminum shell cleaning wastewater pretreatment system according to claim 4, characterized in that: The demulsification tank (21) and the Fenton reaction tank (31) are provided with liquid outlets (8), the bottom of the PH adjusting tank (5) corresponding to the ferrous reaction chamber (211) is provided with a lower liquid outlet (82), the top of the PH adjusting tank (5) between the ferrous reaction chamber (211) and the demulsification reaction chamber (212) is provided with an upper liquid outlet (81) in communication with the ferrous reaction chamber (211), the top of the ferrous reaction chamber (211) is provided with an upper liquid outlet (81) in communication with the coagulation and flocculation tank (41), the bottom of the PH adjusting tank (5) corresponding to the Fenton reaction tank (31) is provided with a lower liquid outlet (82) in communication with the Fenton reaction tank (31) and the top is provided with an upper liquid outlet (81) in communication with the coagulation and flocculation tank (41).

6. The new energy vehicle aluminum shell cleaning wastewater pretreatment system according to claim 5, characterized in that: The air flotation tank (42) and the sedimentation tank (43) are in communication with the coagulation and flocculation tank (41) through the upper liquid outlet (81), and the top of the sedimentation tank (43) is provided with a flow guide plate (431) close to the upper liquid outlet (81).

7. The new energy vehicle aluminum shell cleaning wastewater pretreatment system according to claim 6, characterized in that: The bottom of the sedimentation tank (43) is provided with a sludge discharge port (432), and the bottom of the sedimentation tank (43) is in the shape of a truncated pyramid with the bottom surface upward, one side of the sedimentation tank (43) is provided with a transfer tank (435), and the top of the sedimentation tank (43) is in communication with the transfer tank (435) and the communication part is provided with a water outlet weir plate (433).

8. The new energy vehicle aluminum shell cleaning wastewater pretreatment system according to claim 7, characterized in that: The top of the sedimentation tank (43) is also provided with a dross tank (434), the extension direction of the dross tank (434) is the same as that of the weir plate, and the bottom plate of the dross tank (434) is inclined, and the extension end of the bottom plate of the dross tank (434) is connected with a dross discharge port (4341).

9. The new energy vehicle aluminum shell cleaning wastewater pretreatment system according to claim 7, characterized in that: The transfer tank (435) and the anaerobic tank (32) are in communication through a water conveying pipe (436), and the water conveying pipe (436) is provided with a heat tracing device (4361).

10. The new energy vehicle aluminum shell cleaning wastewater pretreatment system according to claim 7, characterized in that: A plurality of float switches (9) are arranged in the wastewater collection tank (1) and the transfer tank (435), and the float switches (9) correspond to a plurality of different liquid levels.

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