A paint cleaning waste solvent recovery treatment system

Abstract

The utility model relates to hazardous waste treatment technical field more specifically, relate to a kind of paint cleaning waste solvent recovery processing system, including paint residue processing module, primary filtration module, and the precision filtration module connected with primary filtration module and the reuse water tank connected with the water outlet of precision filtration module, paint residue processing module includes raw liquid tank, solid-liquid separation device, paint residue collecting device and transfer water tank, raw liquid tank is connected with solid-liquid separation device by water inlet pipeline, and the blow-off port of solid-liquid separation device is connected with paint residue collecting device, and the water outlet of solid-liquid separation device is connected with transfer water tank by water outlet pipeline, and the water outlet of transfer water tank is connected with primary filtration module.The system adds flocculating agent to raw liquid tank, separates flocculation and solvent by solid-liquid separation device, waste solvent does not need to be deposited in raw liquid tank, improves the recovery processing efficiency of solvent, and paint residue flocculated into group is separated in solid-liquid separation device, not easy with solvent into next process.

Description

Technical Field

[0001] This utility model relates to the field of hazardous waste treatment technology, and more specifically, to a system for recycling and treating waste solvents from paint cleaning. Background Technology

[0002] In the process of spraying water-wash paint on the topcoat line in the painting workshop, in order to ensure the quality of the spraying, the robot cup head needs to be cleaned at a certain frequency. The waste solvent output of a single robot is 4kg, so a large amount of water-based waste solvent is generated every day. The waste solvent needs to be treated as hazardous waste, which generates a lot of hazardous waste treatment costs every year. The treatment method of water-wash waste solvent urgently needs to be optimized.

[0003] The prior art discloses a dynamic separation and recovery device for water-based coating cleaning solvents. The cleaning wastewater is allowed to settle in the raw liquid tank, and then decolorized by ultrafiltration, RO and other equipment. The solvent / water can be fully reused, and the concentration can be adjusted by adding solvent for recycling. This achieves a high recovery rate of waste liquid, which can obtain high economic value and considerable emission reduction effect.

[0004] However, this method requires the waste solvent to be allowed to settle in the original tank first, and large particles of paint residue and other impurities must be allowed to settle before the clear liquid is introduced into the next process. The settling process is time-consuming, resulting in low efficiency in the recycling and treatment of waste solvent. Utility Model Content

[0005] The purpose of this invention is to overcome the problem that existing paint cleaning solvent recovery and treatment systems require waste solvents to be allowed to settle before recovery and treatment is not efficient enough. This invention provides a paint cleaning waste solvent recovery and treatment system that does not require waste solvents to be allowed to settle, thereby improving the treatment efficiency of waste solvents.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0007] A paint cleaning waste solvent recycling and treatment system is provided, including a paint sludge treatment module, a primary filtration module, a precision filtration module connected to the primary filtration module, and a recycled water tank connected to the outlet of the precision filtration module. The paint sludge treatment module includes a raw liquid tank, a solid-liquid separation device, a paint sludge collection device, and a transfer water tank. The raw liquid tank is used to receive waste solvent discharged from toilet cleaning. The raw liquid tank is connected to the solid-liquid separation device through an inlet pipe. The drain outlet of the solid-liquid separation device is connected to the paint sludge collection device. The outlet of the solid-liquid separation device is connected to the transfer water tank through an outlet pipe. The outlet of the transfer water tank is connected to the primary filtration module.

[0008] This utility model discloses a waste solvent recovery and treatment system for paint cleaning. After water-based paint is sprayed in the painting workshop, the paint cups are cleaned with an aqueous solvent. The solvent used to clean the cups flows through the toilet and into a storage tank. The waste solvent in the storage tank is then recovered and treated. First, a flocculant is added to the storage tank manually or by machine. The waste solvent in the storage tank undergoes a flocculation reaction, flocculating large particles of impurities such as paint sludge into clumps, facilitating subsequent solid-liquid separation. The flocculated liquid in the storage tank enters a solid-liquid separation device, which separates the flocculants from the solvent. The flocculants then enter a paint sludge collection device for packaging and processing. The solvent from the finished paint residue enters the intermediate water tank. Subsequently, the solvent passes through a primary filtration module and a precision filtration module, gradually filtering out impurities. Finally, the solvent enters the recycled water tank. At this point, the solvent has been recovered through the above process and can be reused in the spraying operation. Compared with the existing technology, this system adds flocculant to the raw liquid tank and separates the flocculants and solvent through a solid-liquid separation device. The waste solvent does not need to be left to settle in the raw liquid tank, improving the solvent recovery efficiency. The flocculated paint residue is separated in the solid-liquid separation device and is less likely to enter the next process with the solvent, avoiding damage to subsequent equipment.

[0009] Furthermore, the paint sludge treatment module also includes a flocculant addition device. The output end of the flocculant addition device is connected to the raw liquid tank via an additive pipeline, which is equipped with a metering pump. The flocculant addition device can automatically add flocculant to the raw liquid tank, achieving a higher degree of automation. The metering pump can control the amount of flocculant entering the raw liquid tank each time, allowing for the quantitative addition of flocculant according to a set pump frequency, ensuring sufficient reaction and avoiding flocculant waste.

[0010] Furthermore, the raw material tank is equipped with a stirring device. The stirring device can agitate the waste solvent in the raw material tank to ensure a full reaction between the waste solvent and the flocculant, thereby guaranteeing the quality of subsequent solid-liquid separation.

[0011] Furthermore, the primary filtration module includes a bag filter connected to the outlet of the intermediate water tank and a security filter connected to the outlet of the bag filter, wherein the security filter contains a filter element. The solution, after removing paint residue, passes through the bag filter to remove larger particles of impurities, and then passes through the security filter to remove smaller particles, thus protecting the precision filtration module.

[0012] Furthermore, the precision filtration module includes a UF filter, a UF water tank, and an RO filter. The UF filter includes a UF clear liquid chamber and a UF concentrated liquid chamber separated by a UF membrane. The RO filter includes an RO clear liquid chamber and an RO concentrated liquid chamber separated by an RO membrane. The UF concentrated liquid chamber is connected to the outlet of the security filter, the UF clear liquid chamber is connected to the UF water tank, the RO concentrated liquid chamber is connected to the outlet of the UF water tank, and the RO clear liquid chamber is connected to the recycled water tank. The UF filter removes large molecules such as resin, and the clear liquid enters the UF water tank. The RO filter removes ionic particles, achieving a deep purification process such as decolorization. The clear liquid enters the recycled water tank. This multi-stage filtration gradually removes impurities, resulting in higher recycling quality.

[0013] Furthermore, it also includes a concentrate collection tank. The UF concentrate chamber is connected to the transfer tank via a first return pipe, the RO concentrate chamber is connected to the UF tank via a second return pipe, the transfer tank is connected to the concentrate collection tank via a first drain pipe, and the UF tank is connected to the concentrate collection tank via a second drain pipe. The concentrate filtered by the UF filter returns to the transfer tank via the first return pipe, and the concentrate filtered by the RO filter returns to the UF tank via the second return pipe, achieving circulation and improving the recovery rate. After multiple cycles, the UF concentrate enters the concentrate collection tank via the first drain pipe, and the RO concentrate enters the concentrate collection tank via the second drain pipe. The liquid in the concentrate collection tank is treated as hazardous waste and entrusted to a third party for disposal.

[0014] Furthermore, a first conductivity detection device and a first turbidity meter are installed between the UF clear liquid chamber and the UF water tank, and a second conductivity detection device and a second turbidity meter are installed between the RO clear liquid chamber and the recycled water tank. The UF concentrate chamber and the UF clear liquid chamber are connected through a first cleaning pipeline equipped with a first cleaning pump. The RO concentrate chamber and the RO clear liquid chamber are connected through a second cleaning pipeline equipped with a second cleaning pump. When the first conductivity and the first turbidity meter readings exceed the set values, a cleaning procedure is initiated. The first cleaning pump starts, and water flows in the reverse direction from the UF clear liquid chamber to the UF concentrate chamber to clean the UF membrane. When the second conductivity and the second turbidity meter readings exceed the set values, the second cleaning pump starts, and water flows in the reverse direction from the RO clear liquid chamber to the RO concentrate chamber to clean the RO membrane. This automatic cleaning procedure effectively protects the UF membrane and the RO membrane, extending their service life.

[0015] Furthermore, the recycled water tank is equipped with a concentration detection device and a liquid level detection device. These devices can detect whether the solvent in the recycled water tank is sufficient and whether it meets the concentration standard, thus ensuring the cleaning quality.

[0016] Furthermore, the system also includes a solvent adding device, which is connected to the recycled water tank via a solvent adding pipeline equipped with a solvent pump. The solvent in the recycled water tank is monitored by a concentration detection device and a level detection device. When the concentration or level of the liquid in the tank is insufficient, the solvent pump is activated, and the solvent adding device adds new solvent to the recycled water tank, increasing the concentration and level of the solvent and ensuring cleaning quality.

[0017] Furthermore, the solid-liquid separation device is a screw press, which dehydrates the solvent after flocculation reaction through the screw extrusion principle, resulting in high processing precision and stable operation.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] 1. This system adds flocculant to the raw liquid tank and separates the flocculants and solvents through a solid-liquid separation device. The waste solvent does not need to be left to settle in the raw liquid tank, which improves the efficiency of solvent recovery and treatment. The flocculent paint residue will be separated in the solid-liquid separation device and is less likely to enter the next process with the solvent, thus avoiding damage to subsequent equipment.

[0020] 2. The flocculant addition device and metering pump ensure that the solvent in the stock solution tank reacts fully, avoiding waste of flocculant;

[0021] 3. UF and RO filtration devices can achieve circulation, improving solvent recovery rate;

[0022] 4. The UF filter and RO filter can achieve self-cleaning, effectively protecting the UF membrane and RO membrane and extending their service life;

[0023] 5. The solvent addition device, concentration detection device, and liquid level detection device can monitor the concentration and level of the solvent in the recycled water tank in real time, and add new solvent when the concentration and level are insufficient to ensure cleaning quality. Attached Figure Description

[0024] Figure 1 A schematic diagram of a paint cleaning waste solvent recovery and treatment system;

[0025] Figure 2 A schematic diagram of the third embodiment of a paint cleaning waste solvent recovery and treatment system;

[0026] Figure 3 This is a schematic diagram of the fourth embodiment of a paint cleaning waste solvent recovery and treatment system.

[0027] In the attached diagram: 100, paint sludge treatment module; 110, raw material tank; 111, stirring device; 120, solid-liquid separation device; 121, inlet water pipe; 122, outlet water pipe; 130, paint sludge collection device; 140, transfer water tank; 141, first sewage discharge pipe; 150, flocculant addition device; 151, additive pipeline; 152, metering pump; 200, primary filtration module; 210, bag filter; 220, security filter; 300, precision filtration module; 310, UF filter device; 311. 312, UF concentrate chamber; 313, first reflux line; 314, first cleaning line; 315, first cleaning pump; 320, UF water tank; 321, second drain line; 330, RO filter; 331, RO concentrate chamber; 332, RO clean line chamber; 333, second reflux line; 334, second cleaning line; 335, second cleaning pump; 400, recycled water tank; 500, concentrate collection tank; 600, solvent addition device; 610, solvent addition line; 620, solvent pump. Detailed Implementation

[0028] The present invention will be further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only, representing schematic diagrams rather than actual physical objects, and should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0029] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0030] Example 1

[0031] A paint cleaning waste solvent recovery and treatment system, such as Figure 1 As shown, it includes a paint sludge treatment module 100, a primary filtration module 200, a precision filtration module 300 connected to the primary filtration module 200, and a recycled water tank 400 connected to the outlet of the precision filtration module 300, as follows. Figure 2As shown, the paint sludge treatment module 100 includes a raw liquid tank 110, a solid-liquid separation device 120, a paint sludge collection device 130, a transfer water tank 140, and a flocculant addition device 150. The raw liquid tank 110 is used to receive waste solvent discharged from toilet cleaning. In this embodiment, the solid-liquid separation device 120 is a screw press, also known as a stacked spiral sludge dewatering machine or a screw extrusion dewatering machine. The raw liquid tank 110 and the solid-liquid separation device 120 are connected through an inlet pipe 121. The drain outlet of the solid-liquid separation device 120 is connected to the paint sludge collection device 130. The outlet of the solid-liquid separation device 120 is connected to the transfer water tank 140 via the outlet pipe 122. The outlet of the transfer water tank 140 is connected to the primary filtration module 200. The output end of the flocculant addition device 150 is connected to the raw liquid tank 110 via the additive pipe 151. The additive pipe 151 is equipped with a metering pump 152. The raw liquid tank 110 is equipped with a stirring device 111. In this embodiment, the stirring device 111 includes a rotary motor, a rotating shaft fixed to the output end of the rotary motor, and an impeller mounted on the rotating shaft.

[0032] The working principle of this embodiment is as follows:

[0033] This utility model discloses a waste solvent recovery and treatment system for paint cleaning. After water-wash paint is sprayed in the painting workshop, an aqueous solvent is used to clean the cup head. The solvent used to clean the cup head enters the raw solution tank 110 through the toilet for storage. Subsequently, the waste solvent in the raw solution tank 110 is recovered and treated. A metering pump 152 controls the flocculant adding device 150 to add flocculant into the raw solution tank 110 at a set frequency. The stirring device 111 in the raw solution tank 110 continuously stirs the raw solution, and the waste solvent in the raw solution tank 110 fully undergoes a flocculation reaction, flocculating large particles of impurities such as paint residue into clumps for subsequent processing. Continuing the solid-liquid separation, the flocculated liquid in the raw liquid tank 110 enters the solid-liquid separation device 120. The solid-liquid separation uses the screw extrusion principle to dehydrate the solvent after the flocculation reaction, separating the flocculants and solvent. The flocculants enter the paint sludge collection device 130 for packaging. The solvent after the paint sludge is processed enters the transfer water tank 140. Subsequently, the solvent passes through the primary filtration module 200 and the precision filtration module 300 to gradually filter out impurities in the solvent. Finally, the solvent enters the recycled water tank 400. At this point, the solvent has been recovered through the above process and can be reused in the spraying operation.

[0034] The beneficial effects of this embodiment are as follows:

[0035] Compared to existing technologies, this system adds flocculant to the raw liquid tank 110 and separates the flocculants and solvents through the solid-liquid separation device 120. Waste solvents do not need to settle in the raw liquid tank 110, improving solvent recovery efficiency. Flocculated paint sludge is separated in the solid-liquid separation device 120, preventing it from entering the next process with the solvent and thus avoiding damage to subsequent equipment. The flocculant adding device 150 automatically adds flocculant to the raw liquid tank 110, increasing automation. The metering pump 152 controls the amount of flocculant entering the raw liquid tank 110 each time, adding flocculant quantitatively according to a set pump frequency to ensure sufficient reaction and avoid flocculant waste. The stirring device 111 stirs the waste solvent in the raw liquid tank 110, ensuring sufficient reaction between the waste solvent and flocculant and guaranteeing the quality of subsequent solid-liquid separation.

[0036] Example 2

[0037] This embodiment is a second embodiment of a paint cleaning waste solvent recovery and treatment system. This embodiment is similar to the first embodiment, except that, as shown in the following... Figure 2 As shown, the primary filtration module 200 includes a bag filter 210 connected to the outlet of the intermediate water tank 140 and a security filter 220 connected to the outlet of the bag filter 210. The security filter 220 is equipped with a filter element. In this embodiment, the filtration accuracy of the bag filter 210 is 100µm, and the filtration accuracy of the filter element in the security filter 220 is 50µm.

[0038] The working principle of this embodiment is as follows:

[0039] The solution after removing paint residue passes through bag filter 210 to filter out larger particles of impurities, and then passes through security filter 220 to filter out smaller particles. Through double filtration, particulate matter can be removed and the precision filter module 300 can be effectively protected.

[0040] The remaining working principles of this embodiment are the same as those of Embodiment 1.

[0041] Example 3

[0042] This embodiment is the third embodiment of a paint cleaning waste solvent recovery and treatment system. This embodiment is similar to embodiment two, except that, as shown in the following... Figure 2As shown, it also includes a concentrated liquid collection tank 500, and a precision filtration module 300 including a UF filter device 310, a UF water tank 320, and an RO filter device 330. The UF filter device 310 includes a UF clear liquid chamber 312 and a UF concentrated liquid chamber 311 separated by a UF membrane. The RO filter device 330 includes an RO clear liquid chamber 332 and an RO concentrated liquid chamber 331 separated by an RO membrane. The UF concentrated liquid chamber 311 is connected to the outlet of the security filter 220, the UF clear liquid chamber 312 is connected to the UF water tank 320, the RO concentrated liquid chamber 331 is connected to the outlet of the UF water tank 320, the RO clear liquid chamber 332 is connected to the recycled water tank 400, the UF concentrated liquid chamber 311 is connected to the transfer water tank 140 through a first return pipe 313, and the RO concentrated liquid chamber 331 is connected to the UF water tank 320 through a second return pipe 333. Water tank 140 is connected to concentrated liquid collection tank 500 via first drain pipe 141. UF water tank 320 is connected to concentrated liquid collection tank 500 via second drain pipe 321. A first conductivity detection device and a first turbidity meter are installed between UF clear liquid chamber 312 and UF water tank 320. A second conductivity detection device and a second turbidity meter are installed between RO clear liquid chamber 332 and recycled water tank 400. UF concentrated liquid chamber 311 and UF clear liquid chamber 312 are connected via first cleaning pipe 314. First cleaning pipe 314 is equipped with a first cleaning pump 315. RO concentrated liquid chamber 331 and RO clear liquid chamber 332 are connected via second cleaning pipe 334. Second cleaning pipe 334 is equipped with a second cleaning pump 335. In this embodiment, the filtration accuracy of UF membrane is 0.01µm, and the filtration accuracy of RO membrane is 0.001µm.

[0043] The working principle of this embodiment is as follows:

[0044] The UF filter 310 removes large molecules such as resin, and the clarified liquid enters the UF water tank 320. The concentrated liquid returns to the transfer water tank 140 through the first return pipe 313. The RO filter 330 removes ionic particles, achieving deep purification processes such as decolorization. The clarified liquid enters the recycled water tank 400, and the concentrated liquid returns to the UF water tank 320 through the second return pipe 333. After multiple cycles of UF and RO liquids, the UF concentrated liquid enters the concentrated liquid collection tank 500 through the first drain pipe, and the RO concentrated liquid enters the concentrated liquid collection tank 500 through the second drain pipe 321. The liquid in the concentrated liquid collection tank 500 is entrusted to a third party for treatment as hazardous waste. When the indicators of the first conductivity and the first turbidity meter exceed the set values, a cleaning procedure will be initiated. The first cleaning pump 315 will start, and the water flow will flow in reverse from the UF clear liquid chamber 312 to the UF concentrated liquid chamber 311 to clean the UF membrane. When the indicators of the second conductivity and the second turbidity meter exceed the set values, the second cleaning pump 335 will start, and the water flow will flow in reverse from the RO clear liquid chamber 332 to the RO concentrated liquid chamber 331 to clean the RO membrane. The automatic cleaning procedure can effectively protect the UF membrane and the RO membrane and extend their service life.

[0045] The working principle of this embodiment is as follows:

[0046] Multi-stage filtration gradually removes impurities, resulting in higher recovery quality. The UF filter 310 and RO filter 330 can achieve circulation, improving solvent recovery rate. The UF filter 310 and RO filter 330 can also achieve self-cleaning, effectively protecting the UF membrane and RO membrane and extending their service life.

[0047] The remaining working principles of this embodiment are the same as those of Embodiment 2.

[0048] Example 4

[0049] This embodiment is the fourth embodiment of a paint cleaning waste solvent recovery and treatment system. This embodiment is similar to embodiment three, except that, as shown in the following... Figure 3 As shown, it also includes a solvent adding device 600, a concentration detection device and a liquid level detection device are installed in the recycled water tank 400, the solvent adding device 600 is connected to the recycled water tank 400 through a solvent adding pipeline 610, and the solvent adding pipeline 610 is equipped with a solvent pump 620.

[0050] The working principle of this embodiment is as follows:

[0051] The concentration and level detection devices can detect whether the solvent in the recycled water tank 400 is sufficient and whether it meets the concentration standard, ensuring cleaning quality. When the concentration or level is insufficient, the solvent pump 620 is activated, and the solvent adding device 600 can add new solvent to the recycled water tank 400 to increase the concentration and level of the solvent in the recycled water tank 400, ensuring cleaning quality.

[0052] The remaining working principles of this embodiment are the same as those of Embodiment 3.

[0053] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0054] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make various variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A paint cleaning waste solvent recovery and treatment system, comprising a paint sludge treatment module (100), a primary filtration module (200), a precision filtration module (300) connected to the primary filtration module (200), and a recycled water tank (400) connected to the outlet of the precision filtration module (300), characterized in that, The paint sludge treatment module (100) includes a raw liquid tank (110), a solid-liquid separation device (120), a paint sludge collection device (130), and a transfer water tank (140). The raw liquid tank (110) is used to receive waste solvent discharged from toilet cleaning. The raw liquid tank (110) is connected to the solid-liquid separation device (120) through a water inlet pipe (121). The sewage outlet of the solid-liquid separation device (120) is connected to the paint sludge collection device (130). The water outlet of the solid-liquid separation device (120) is connected to the transfer water tank (140) through a water outlet pipe (122). The water outlet of the transfer water tank (140) is connected to the primary filtration module (200).

2. The paint cleaning waste solvent recovery and treatment system according to claim 1, characterized in that, The paint sludge treatment module (100) also includes a flocculant addition device (150). The output end of the flocculant addition device (150) is connected to the original liquid tank (110) through an additive pipeline (151). The additive pipeline (151) is equipped with a metering pump (152).

3. The paint cleaning waste solvent recovery and treatment system according to claim 2, characterized in that, The original liquid tank (110) is equipped with a stirring device (111).

4. The paint cleaning waste solvent recovery and treatment system according to claim 1, characterized in that, The primary filtration module (200) includes a bag filter (210) connected to the outlet of the intermediate water tank (140) and a security filter (220) connected to the outlet of the bag filter (210), wherein the security filter (220) is provided with a filter element.

5. The paint cleaning waste solvent recovery and treatment system according to claim 4, characterized in that, The precision filtration module (300) includes a UF filter (310), a UF water tank (320), and an RO filter (330). The UF filter (310) includes a UF concentrate chamber (311) and a UF clear liquid chamber (312) separated by a UF membrane. The RO filter (330) includes an RO concentrate chamber (331) and an RO clear liquid chamber (332) separated by an RO membrane. The UF concentrate chamber (311) is connected to the outlet of the security filter (220). The UF clear liquid chamber (312) is connected to the UF water tank (320). The RO concentrate chamber (331) is connected to the outlet of the UF water tank (320). The RO clear liquid chamber (332) is connected to the recycled water tank (400).

6. The paint cleaning waste solvent recovery and treatment system according to claim 5, characterized in that, It also includes a concentrate collection tank (500), the UF concentrate chamber (311) is connected to the transfer water tank (140) through a first return pipe (313), the RO concentrate chamber (331) is connected to the UF water tank (320) through a second return pipe (333), the transfer water tank (140) is connected to the concentrate collection tank (500) through a first sewage pipe (141), and the UF water tank (320) is connected to the concentrate collection tank (500) through a second sewage pipe (321).

7. The paint cleaning waste solvent recovery and treatment system according to claim 6, characterized in that, A first conductivity detection device and a first turbidity meter are provided between the UF clear liquid chamber (312) and the UF water tank (320). A second conductivity detection device and a second turbidity meter are provided between the RO clear liquid chamber (332) and the recycled water tank (400). The UF concentrated liquid chamber (311) and the UF clear liquid chamber (312) are connected through a first cleaning pipeline (314), which is equipped with a first cleaning pump (315). The RO concentrated liquid chamber (331) and the RO clear liquid chamber (332) are connected through a second cleaning pipeline (334), which is equipped with a second cleaning pump (335).

8. A paint cleaning waste solvent recovery and treatment system according to any one of claims 1-7, characterized in that, The recycled water tank (400) is equipped with a concentration detection device and a liquid level detection device.

9. A paint cleaning waste solvent recovery and treatment system according to claim 8, characterized in that, It also includes a solvent adding device (600), which is connected to the recycled water tank (400) via a solvent adding pipeline (610), and the solvent adding pipeline (610) is equipped with a solvent pump (620).

10. A paint cleaning waste solvent recovery and treatment system according to any one of claims 1-7, characterized in that, The solid-liquid separation device (120) is a screw press.

Images