Cleaning wastewater treatment system for power battery structural member production

Abstract

The utility model discloses a power battery structural member production cleaning wastewater treatment system, which is used for treating power battery structural member production cleaning wastewater and comprises an oil separation tank, a cleaning water adjusting tank, a middle tank, a membrane treatment system and a clean water tank which are sequentially arranged according to the treatment sequence. According to the utility model, the power battery structural member production wastewater is effectively treated.

Description

Technical Field

[0001] The utility model relates to the field of environmental protection water treatment, in particular to a power battery structural parts production cleaning wastewater treatment system. Background Art

[0002] In recent years, new energy vehicles have developed rapidly, including pure electric vehicles, extended-range electric vehicles, hybrid vehicles, fuel cell electric vehicles, hydrogen engine vehicles and other new energy vehicles. Among them, pure electric vehicle technology is the most mature, its prospects are widely optimistic, and it is recognized as the most likely to replace traditional vehicles. The most core component of pure electric vehicles is the power battery. Its specific capacity, safety performance, production cost, etc. are the key factors that determine whether pure electric vehicles can be widely promoted and used. However, power batteries will generate a large amount of production wastewater during the manufacturing process. Among them, the water quality of the production wastewater of power battery structural parts is relatively complex.

[0003] With the accelerated industrialization of power batteries, the amount of production wastewater, especially cleaning wastewater, from power battery components is increasing, posing increasingly serious environmental risks to the ecological environment and human health. However, there is currently no effective solution for treating this wastewater, either domestically or internationally. The existing treatment scheme for power battery component production wastewater involves the following: cleaning wastewater is separated in a grease trap, then conditioned in a cleaning water regulating tank, and then precipitated in an intermediate tank. The water from the intermediate tank then enters a conventional biochemical treatment system for biochemical treatment. The clear water then enters a clear water tank, and the sludge enters a biochemical sludge tank. The sludge is then filtered through a plate and frame filter press, leaving the sludge cake as solid waste. The filtrate then returns to the biochemical system for further treatment.

[0004] The water quality in the clear water tank after treatment using the existing treatment scheme for wastewater from the production of power battery structural parts cannot meet the standards and requires further treatment before it can be discharged in compliance with the standards.

[0005] Finding an effective solution to wastewater production in power battery structural parts has become an urgent issue that needs to be addressed in the industry. Utility Model Content

[0006] Based on the above problems, the present invention provides a power battery structural component production cleaning wastewater treatment system, which aims to improve at least one of the problems mentioned in the background technology.

[0007] The technical solution is: a power battery structural parts production cleaning wastewater treatment system, which treats the power battery structural parts production cleaning wastewater, including the following arranged in the order of treatment: grease separator, cleaning water regulating tank, intermediate tank, membrane treatment system and clear water tank.

[0008] Optionally, the power battery structural member is a component for protecting the interior of the power battery, including a battery shell, a battery cover, a battery bottom plate and metal accessories.

[0009] Optionally, the power battery structural component production wastewater is power battery structural component production cleaning wastewater.

[0010] Optionally, the membrane treatment system includes: a primary membrane pool, a primary membrane water production tank, a secondary membrane pool, a secondary membrane water production tank, a tertiary membrane pool and a tertiary membrane water production tank, which are arranged in order of treatment.

[0011] Optionally, the membrane installed in the primary membrane pool is a tubular membrane, and the membranes installed in the secondary membrane pool and the tertiary membrane pool are both nanofiltration membranes.

[0012] Optionally, the power battery structural parts production wastewater treatment system also includes a petroleum water treatment system, which treats the upper oil and water in the cleaning water regulating tank and the concentrate formed in the intermediate tank during operation. The petroleum water treatment system includes: flotation equipment, three-phase separator and oil collection box, which are arranged in the order of treatment. The flotation equipment dynamically separates to form three phases, and the three-phase separator statically separates the oil phase from the flotation equipment to form three phases; the petroleum water treatment system also includes: a physicochemical sludge pool and a physicochemical filter press, which are arranged in the order of treatment. The physicochemical sludge pool is used to treat the sludge discharged from the flotation equipment and the three-phase separator, and the mud cake of the physicochemical filter press and the oil in the oil collection box are transported away as hazardous waste.

[0013] Optionally, a first pipeline and a second pipeline arranged in parallel are connected between the flotation equipment and the cleaning water regulating tank, the three-phase separator is connected to the third pipeline, the other end of the third pipeline is connected to the first pipeline, the physicochemical sludge tank is also connected to the fifth pipeline and the sixth pipeline, the other end of the sixth pipeline is connected to the physicochemical filter press, the intermediate tank is connected to the seventh pipeline, the other end of the seventh pipeline is connected to the second pipeline, and the other end of the fifth pipeline is connected to the seventh pipeline; the first pipeline and the third pipeline return the water phase separated by the three-phase separator and the water phase separated by the flotation equipment to the cleaning water regulating tank, the second pipeline, the fifth pipeline and the seventh pipeline send the upper oil and water of the cleaning water regulating tank, the concentrate of the intermediate tank, and the water layer of the physicochemical sludge tank to the flotation equipment, and the sixth pipeline returns the filtrate of the physicochemical filter press to the physicochemical sludge tank.

[0014] Optionally, the intermediate pool is also connected to a fourth pipe, the other end of the fourth pipe is connected to the primary membrane pool, the primary membrane water production tank is connected to an eighth pipe, the other end of the eighth pipe is connected to the secondary membrane pool, the secondary membrane water production tank is connected to a ninth pipe, and the other end of the ninth pipe is connected to the tertiary membrane pool; the fourth pipe returns the concentrate of the primary membrane pool to the intermediate pool, the eighth pipe returns the concentrate of the secondary membrane pool to the primary membrane water production tank, and the ninth pipe returns the concentrate of the tertiary membrane pool to the secondary membrane water production tank.

[0015] Optionally, the membrane treatment system further includes a cleaning system, which is respectively connected to the primary membrane pool, the secondary membrane pool and the tertiary membrane pool.

[0016] Optionally, the power battery structural parts production wastewater treatment system also includes a biochemical treatment system and a biochemical sludge treatment system. The biochemical treatment system is located between the membrane treatment system and the clear water tank, and the biochemical sludge treatment system is located after the membrane treatment system and is used to treat the biochemical sludge discharged from the biochemical sludge treatment system; the biochemical treatment system includes: at least one anaerobic tank, a first sedimentation tank, an anoxic tank, at least one aerobic tank, a medium sedimentation tank and a second sedimentation tank, which are arranged in sequence according to the treatment order; the biochemical sludge treatment system includes: a biochemical sludge tank, a biochemical filter press and a sludge temporary storage room, which are arranged in sequence according to the treatment order.

[0017] Utility model principle and beneficial effects:

[0018] The utility model applicant team found in the treatment of power battery structural parts production wastewater that the water quality after treatment by the existing power battery structural parts production wastewater treatment scheme needs further treatment because it does not take into account the particularity of power battery structural parts production wastewater. The water quality of power battery structural parts production wastewater is basically as shown in Table 1 (the data in Table 1 are derived from the values ​​detected by adjusting the water volume and balancing the water quality of the power battery structural parts production cleaning wastewater after the oil-water separation tank enters the cleaning water regulating tank without adding any liquid):

[0019] Table 1 Water quality of raw water from power battery structural parts production wastewater

[0020]

[0021] As can be seen from Table 1, the main pollutants in the wastewater produced by power battery structural parts are relatively high, and the contents of COD, BOD, SS, and petroleum are much higher than those in ordinary wastewater. The BOD / COD ratio is <0.3, and the conductivity is also relatively high, making it difficult to treat.

[0022] The utility model sets a three-stage membrane treatment system in front of the biochemical treatment system, and follows the ratio of concentrated liquid return after treatment in the first membrane pool>the ratio of concentrated liquid return after treatment in the second membrane pool>the ratio of concentrated liquid return after treatment in the third membrane pool, and returns the water phase separated by the three-phase separator and the water phase separated by the flotation equipment to the cleaning water regulating tank, and sends the upper oil-water layer of the cleaning water regulating tank, the concentrated liquid in the middle tank, and the water layer of the physicochemical sludge tank to the flotation equipment. Through dynamic separation of the flotation equipment + static separation of the three-phase separator, the power battery structural parts production cleaning wastewater can be treated into dischargeable wastewater without adding external liquid medicine. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the processing process of the utility model. DETAILED DESCRIPTION

[0024] The present invention will be further described below with reference to the accompanying drawings.

[0025] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inside", "outside", "front", "back", "top", "bottom", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the utility model product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0026] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "opened," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connection, detachable connection, or integral connection; they may refer to direct connection, indirect connection through an intermediate medium, or internal connection between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0027] In the present invention, the power battery structural parts refer to the components that protect the interior of the power battery, including the battery shell, battery cover, battery bottom plate and metal accessories.

[0028] In the present utility model, power battery structural parts production wastewater refers to power battery structural parts production cleaning wastewater.

[0029] Please refer to Figure 1 The embodiment of the utility model provides a power battery structural parts production wastewater treatment system, which includes: a grease separator, a cleaning water regulating tank, an intermediate tank, a membrane treatment system and a clear water tank, which are arranged in the following treatment order.

[0030] Furthermore, the membrane treatment system includes: a primary membrane pool, a primary membrane water production tank, a secondary membrane pool, a secondary membrane water production tank, a tertiary membrane pool and a tertiary membrane water production tank, which are arranged in the treatment order.

[0031] Furthermore, the membrane installed in the first-stage membrane pool is a tubular membrane, and the membranes installed in the second-stage membrane pool and the third-stage membrane pool are both nanofiltration membranes.

[0032] Furthermore, the power battery structural component production wastewater treatment system also includes a petroleum water treatment system, which treats the upper oil and water in the wash water regulating tank and the concentrate formed during operation in the intermediate tank. The petroleum water treatment system includes, arranged in the following order: flotation equipment, a three-phase separator, and an oil collection tank. The flotation equipment dynamically separates the oil phase into three phases (from top to bottom: oil phase, water phase, and mud phase). The three-phase separator statically separates the oil phase from the flotation equipment into three phases (from top to bottom: oil phase, water phase, and mud phase). The petroleum water treatment system also includes, arranged in the following order: a physicochemical sludge tank and a physicochemical filter press. The physicochemical sludge tank is used to treat the sludge discharged from the flotation equipment and the three-phase separator. The mud cake from the physicochemical filter press and the oil in the oil collection tank are transported for disposal as hazardous waste.

[0033] Furthermore, to achieve better treatment results, a first and second parallel pipelines are connected between the flotation equipment and the wash water regulating tank. A third pipeline is connected to the three-phase separator, the other end of which is connected to the first pipeline. The physicochemical sludge tank is also connected to a fifth and sixth pipelines, the other end of the sixth pipeline is connected to the physicochemical filter press. A seventh pipeline is connected to the intermediate tank, the other end of the seventh pipeline is connected to the second pipeline, and the other end of the fifth pipeline is connected to the seventh pipeline. The first and third pipelines return the aqueous phase separated by the three-phase separator and the aqueous phase separated by the flotation equipment to the wash water regulating tank. The second, fifth, and seventh pipelines carry the upper oily water layer of the wash water regulating tank, the concentrate from the intermediate tank, and the aqueous layer of the physicochemical sludge tank to the flotation equipment. The sixth pipeline returns the filtrate from the physicochemical filter press to the physicochemical sludge tank.

[0034] In the present invention, the process of forming the concentrated liquid in the intermediate tank is as follows: water from the intermediate water layer is transported from the cleaning water regulating tank to the intermediate tank to a certain liquid level, and then the water in the intermediate tank is transported to the membrane treatment system for treatment. Water at a certain liquid level is retained in the intermediate tank. After the membrane treatment system has completed the treatment, water from the intermediate water layer is transported from the cleaning water regulating tank to the intermediate tank to the same liquid level, and then the water in the intermediate tank is transported to the membrane treatment system for treatment. Water at a certain liquid level at the bottom of the intermediate tank is retained in the intermediate tank. Water at the same liquid level is retained in the intermediate tank. The next cycle is performed according to this operating mode. After multiple operations, the liquid remaining in the intermediate tank is the concentrated liquid.

[0035] Furthermore, in order to achieve better treatment effects, the intermediate pool is also connected to a fourth pipe, the other end of the fourth pipe is connected to the primary membrane pool, the primary membrane water production tank is connected to an eighth pipe, the other end of the eighth pipe is connected to the secondary membrane pool, the secondary membrane water production tank is connected to a ninth pipe, and the other end of the ninth pipe is connected to the tertiary membrane pool; the fourth pipe returns the concentrate of the primary membrane pool to the intermediate pool, the eighth pipe returns the concentrate of the secondary membrane pool to the primary membrane water production tank, and the ninth pipe returns the concentrate of the tertiary membrane pool to the secondary membrane water production tank.

[0036] Furthermore, in order to achieve better treatment effects, the proportion of the concentrate returned by the fourth, eighth and ninth pipelines to the concentrate produced at that stage gradually decreases. Furthermore, the fourth pipeline returns all the concentrate from the first-stage membrane pool to the intermediate pool, the eighth pipeline returns 40% of the concentrate from the second-stage membrane pool to the first-stage membrane water production tank, and the ninth pipeline returns 20% of the concentrate from the third-stage membrane pool to the second-stage membrane water production tank.

[0037] Furthermore, the membrane treatment system also includes a cleaning system, which is respectively connected to the primary membrane pool, the secondary membrane pool and the tertiary membrane pool. The cleaning system is used to be turned on when the primary membrane pool, the secondary membrane pool and the tertiary membrane pool are not working to clean the membranes in the primary membrane pool, the secondary membrane pool and the tertiary membrane pool.

[0038] The utility model sets up a three-stage membrane treatment system, and follows the ratio of concentrated liquid return after treatment in the first-stage membrane pool>the ratio of concentrated liquid return after treatment in the second-stage membrane pool>the ratio of concentrated liquid return after treatment in the third-stage membrane pool, and returns the water phase separated by the three-phase separator and the water phase separated by the flotation equipment to the cleaning water regulating tank, and sends the upper oil-water layer of the cleaning water regulating tank, the concentrated liquid in the middle tank, and the water layer of the physicochemical sludge tank to the flotation equipment. Through dynamic separation of the flotation equipment + static separation of the three-phase separator, the power battery structural parts production cleaning wastewater can be treated into dischargeable wastewater without adding external liquid medicine.

[0039] Furthermore, when the raw water quality of the power battery structural parts production cleaning wastewater deteriorates, the treated wastewater does not meet the standards and cannot enter the clean water tank. The power battery structural parts production wastewater treatment system also includes a biochemical treatment system and a biochemical sludge treatment system. The biochemical treatment system is located between the membrane treatment system and the clean water tank, and the biochemical sludge treatment system is located after the membrane treatment system and is used to treat the biochemical sludge discharged from the biochemical sludge treatment system.

[0040] Furthermore, the biochemical treatment system includes, arranged in order of treatment: at least one anaerobic tank, a first sedimentation tank, an anoxic tank, at least one aerobic tank, a middle sedimentation tank and a second sedimentation tank.

[0041] Furthermore, the biochemical sludge treatment system includes: a biochemical sludge pool, a biochemical filter press and a sludge temporary storage room, which are arranged in the treatment order. The sludge in the sludge temporary storage room is transported out for treatment as solid waste.

[0042] The method for treating wastewater produced by power battery structural parts provided in the embodiment of the present utility model adopts the wastewater treatment system for power battery structural parts provided in the embodiment of the present utility model for treatment.

[0043] In the following Examples 1 to 3 and Comparative Examples 1 to 6, the equipment size of the power battery structural parts production wastewater treatment system is 240m 3 / d Design of the raw water treatment capacity for power battery structural parts production and cleaning wastewater. Those skilled in the art can design it according to needs.

[0044] In the following Examples 1 to 3 and Comparative Examples 1 to 6, the number of anaerobic tanks set in the biochemical treatment system is 2, which are a first-level UASB anaerobic tank and a second-level UASB anaerobic tank, and the number of aerobic tanks is 6, which are set in sequence, and the second sedimentation tank is an inclined tube sedimentation tank.

[0045] Example 1

[0046] In this embodiment, in the power battery structural component production wastewater treatment system of the utility model, the biochemical treatment system is not turned on, the membrane treatment system and the petroleum water treatment system are turned on, the water quality of the treatment object is shown in Table 2 below, and the water quality of the three-stage membrane water production tank is shown in Table 2 below.

[0047] In this embodiment, the reflux ratio of the concentrated solution after treatment in the first membrane pool is 100%, the reflux ratio of the concentrated solution after treatment in the second membrane pool is 40%, and the reflux ratio of the concentrated solution after treatment in the third membrane pool is 20%.

[0048] Comparative Example 1

[0049] Compared with Example 1, this comparative example 1 is the same as Example 1 except that the water quality of the treatment object is worsened.

[0050] The reflux ratio of the concentrated solution after treatment in the first-stage membrane pool is 100%, the reflux ratio of the concentrated solution after treatment in the second-stage membrane pool is 40%, and the reflux ratio of the concentrated solution after treatment in the third-stage membrane pool is 20%.

[0051] The water quality of the treatment object is shown in Table 2, and the water quality of the tertiary membrane water production tank is shown in Table 2.

[0052] Example 2

[0053] This embodiment is carried out on the basis of Comparative Example 1 (i.e. including Comparative Example 1). When Comparative Example 1 detects that the water quality of the tertiary membrane water production tank does not meet the discharge standard, the biochemical treatment system is turned on to perform biochemical treatment.

[0054] The effluent quality of the biochemical treatment system is shown in Table 2.

[0055] Comparative Example 2

[0056] In this comparative example, in the power battery structural component production wastewater treatment system of the present invention, the membrane treatment system is turned off, and the biochemical treatment system and the petroleum water treatment system are turned on. The water quality of the treatment object is the same as that in Example 1.

[0057] The effluent quality of the biochemical treatment system is shown in Table 2.

[0058] Comparative Example 3

[0059] The water quality of the treatment object in Comparative Example 3 is the same as that in Example 1, except that the reflux ratio of the concentrate after treatment in the primary membrane pool is 50%, the reflux ratio of the concentrate after treatment in the secondary membrane pool is 50%, and the reflux ratio of the concentrate after treatment in the tertiary membrane pool is 50%.

[0060] The water quality of the tertiary membrane water production tank is shown in Table 2.

[0061] Comparative Example 4

[0062] In Comparative Example 4, the water quality of the treatment object is the same as that of Example 2, except that the membrane treatment system and the biochemical treatment system are turned on, and the petroleum water treatment system is not turned on.

[0063] The reflux ratio of the concentrated solution after treatment in the first-stage membrane pool is 100%, the reflux ratio of the concentrated solution after treatment in the second-stage membrane pool is 40%, and the reflux ratio of the concentrated solution after treatment in the third-stage membrane pool is 20%.

[0064] The effluent quality of the biochemical treatment system is shown in Table 2.

[0065] Comparative Example 5

[0066] In Comparative Example 5, the water quality of the treatment object is the same as that of Example 2, and the membrane treatment system, biochemical treatment system and petroleum water treatment system are all turned on. The difference is that in the petroleum water treatment system, the three-phase separator is not turned on.

[0067] The reflux ratio of the concentrated solution after treatment in the first-stage membrane pool is 100%, the reflux ratio of the concentrated solution after treatment in the second-stage membrane pool is 40%, and the reflux ratio of the concentrated solution after treatment in the third-stage membrane pool is 20%.

[0068] The effluent quality of the biochemical treatment system is shown in Table 2.

[0069] Comparative Example 6

[0070] In Comparative Example 6, the water quality of the treatment object is the same as that of Example 2, and the membrane treatment system, biochemical treatment system and petroleum water treatment system are all turned on. The difference is that in the petroleum water treatment system, the flotation equipment is not turned on.

[0071] The reflux ratio of the concentrated solution after treatment in the first-stage membrane pool is 100%, the reflux ratio of the concentrated solution after treatment in the second-stage membrane pool is 40%, and the reflux ratio of the concentrated solution after treatment in the third-stage membrane pool is 20%.

[0072] The effluent quality of the biochemical treatment system is shown in Table 2.

[0073] Example 3

[0074] In Example 3, the water quality of the treatment object is the same as that in Example 2, and the membrane treatment system, the biochemical treatment system and the petroleum water treatment system are also turned on. The difference is that the biochemical filter press is connected to the tenth pipe, and the other end of the tenth pipe is connected to the cleaning water regulating tank. The tenth pipe returns the filtrate of the biochemical filter press to the cleaning water regulating tank.

[0075] The reflux ratio of the concentrated solution after treatment in the first-stage membrane pool is 100%, the reflux ratio of the concentrated solution after treatment in the second-stage membrane pool is 40%, and the reflux ratio of the concentrated solution after treatment in the third-stage membrane pool is 20%.

[0076] The effluent quality of the biochemical treatment system is shown in Table 2.

[0077] Table 2

[0078]

[0079] As can be seen from Table 2, in Example 1, when the water quality of the power battery structural parts production wastewater treated is not too bad, the biochemical treatment system is not turned on and the water quality of the tertiary membrane water production tank can be discharged into the clear water tank.

[0080] However, in comparative example 1 where the water quality is relatively poor, the water quality of the tertiary membrane water production tank does not meet the standards and cannot be discharged into the clear water tank.

[0081] In Example 2, the water in the three-stage membrane water production tank of Comparative Example 1 is treated by a biochemical treatment system and can be sent to the clean water tank to meet the standards.

[0082] In Comparative Example 2, the treated water quality is the same as that in Example 1 (the water quality is not too bad), but because it is not treated by the membrane treatment system and directly enters the biochemical system for treatment, the effluent quality after the biochemical system treatment does not meet the standards and cannot be discharged into the clear water tank.

[0083] Comparative Example 3 compared with Example 1 (water quality is not too bad), under the same water quality conditions, the concentrate reflux ratio of each level is the same, the water quality of the tertiary membrane water production tank does not meet the discharge standards and cannot be discharged into the clear water tank.

[0084] Comparative Example 4 is compared with Example 2 (poor water quality). Under the same water quality conditions, because the petroleum water treatment system is not turned on, the water quality from the biochemical treatment system does not meet the discharge standards and cannot be discharged into the clear water tank.

[0085] Compared with Example 2, under the same water quality conditions, although the petroleum water treatment system was turned on, the static three-phase separator in the petroleum water treatment system was not turned on, and the water quality coming out of the biochemical treatment system did not meet the discharge standards and could not be discharged into the clear water tank.

[0086] Comparative Example 6 Compared with Example 2, under the same water quality conditions, although the petroleum water treatment system was turned on, the water quality from the biochemical treatment system did not meet the discharge standards and could not be discharged into the clear water tank because the flotation equipment for phase separation in the petroleum water treatment system was not turned on.

[0087] Compared with Example 2, under the same water quality conditions, Example 3 has a better treatment effect than Example 2 because the filtrate of the biochemical filter press is returned to the cleaning water regulating tank.

[0088] Unless otherwise specified in the present invention, all references are to prior art.

[0089] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A power battery structural component production cleaning wastewater treatment system, which treats power battery structural component production cleaning wastewater, characterized in that: It includes the following systems arranged in the order of treatment: grease trap, cleaning water regulating tank, intermediate tank, membrane treatment system and clear water tank.

2. The power battery structural component production cleaning wastewater treatment system according to claim 1, characterized in that: The power battery structural parts are components that protect the interior of the power battery, including a battery shell, a battery cover, a battery bottom plate and metal accessories.

3. The power battery structural component production cleaning wastewater treatment system according to claim 1, characterized in that: The power battery structural component production wastewater is power battery structural component production cleaning wastewater.

4. The power battery structural component production and cleaning wastewater treatment system according to claim 1 is characterized in that the membrane treatment system includes: a primary membrane pool, a primary membrane water production tank, a secondary membrane pool, a secondary membrane water production tank, a tertiary membrane pool and a tertiary membrane water production tank, which are arranged in the following treatment order.

5. The power battery structural parts production cleaning wastewater treatment system according to claim 4 is characterized in that the membrane installed in the first-level membrane pool is a tubular membrane, and the membranes installed in the second-level membrane pool and the third-level membrane pool are both nanofiltration membranes.

6. The power battery structural component production cleaning wastewater treatment system according to claim 1 is characterized in that the power battery structural component production wastewater treatment system also includes a petroleum water treatment system, which treats the upper oil and water in the cleaning water regulating tank and the concentrate formed in the intermediate tank during operation. The petroleum water treatment system includes: a flotation device, a three-phase separator and an oil collection box, which are arranged in the treatment order. The flotation device dynamically separates to form three phases, and the three-phase separator statically separates the oil phase from the flotation device to form three phases; the petroleum water treatment system also includes: a physicochemical sludge pool and a physicochemical filter press, which are arranged in the treatment order. The physicochemical sludge pool is used to treat the sludge discharged from the flotation device and the three-phase separator, and the mud cake of the physicochemical filter press and the oil in the oil collection box are transported away for treatment as hazardous waste.

7. The power battery structural component production cleaning wastewater treatment system according to claim 6 is characterized in that a first pipe and a second pipe arranged in parallel are connected between the flotation equipment and the cleaning water regulating tank, the three-phase separator is connected to a third pipe, the other end of the third pipe is connected to the first pipe, the physicochemical sludge tank is also connected to a fifth pipe and a sixth pipe, the other end of the sixth pipe is connected to the physicochemical filter press, the intermediate tank is connected to a seventh pipe, the other end of the seventh pipe is connected to the second pipe, and the other end of the fifth pipe is connected to the seventh pipe; the first pipe and the third pipe return the water phase separated by the three-phase separator and the water phase separated by the flotation equipment to the cleaning water regulating tank, the second pipe, the fifth pipe, and the seventh pipe send the upper oil and water of the cleaning water regulating tank, the concentrate of the intermediate tank, and the water layer of the physicochemical sludge tank to the flotation equipment, and the sixth pipe returns the filtrate of the physicochemical filter press to the physicochemical sludge tank.

8. The power battery structural parts production and cleaning wastewater treatment system according to claim 7 is characterized in that the intermediate pool is also connected to a fourth pipe, the other end of the fourth pipe is connected to the primary membrane pool, the primary membrane water production tank is connected to an eighth pipe, the other end of the eighth pipe is connected to the secondary membrane pool, the secondary membrane water production tank is connected to a ninth pipe, and the other end of the ninth pipe is connected to the tertiary membrane pool; the fourth pipe returns the concentrate of the primary membrane pool to the intermediate pool, the eighth pipe returns the concentrate of the secondary membrane pool to the primary membrane water production tank, and the ninth pipe returns the concentrate of the tertiary membrane pool to the secondary membrane water production tank.

9. The power battery structural component production cleaning wastewater treatment system according to claim 8 is characterized in that the membrane treatment system also includes a cleaning system, and the cleaning system is respectively connected to the primary membrane pool, the secondary membrane pool and the tertiary membrane pool.

10. The power battery structural component production cleaning wastewater treatment system according to claim 7 is characterized in that the power battery structural component production wastewater treatment system also includes a biochemical treatment system and a biochemical sludge treatment system, the biochemical treatment system is located between the membrane treatment system and the clear water tank, and the biochemical sludge treatment system is located after the membrane treatment system and is used to treat the biochemical sludge discharged from the biochemical sludge treatment system; the biochemical treatment system includes: at least one anaerobic tank, a first sedimentation tank, an anoxic tank, at least one aerobic tank, a medium sedimentation tank and a second sedimentation tank, which are arranged in sequence in the treatment order; the biochemical sludge treatment system includes: a biochemical sludge tank, a biochemical filter press and a sludge temporary storage room, which are arranged in sequence in the treatment order.

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