A painting wastewater filtering device

Abstract

The utility model relates to wastewater treatment technical field, and disclose a kind of coating wastewater filtering device, including filter tank, coarse filter screen, fine filter screen and microfiltration membrane are sequentially arranged horizontally from top to bottom along height direction in the filter tank interior. The coating wastewater filtering device, by adopting the three-stage progressive filtering combination of "coarse filter screen+fine filter screen+microfiltration membrane", the impurity characteristics of coating wastewater are accurately matched to realize efficient purification, wherein, polypropylene braided mesh can stably intercept paint residue clumps and workpiece debris in wastewater by virtue of excellent acid and alkali resistance, polyester meltblown nonwoven fabric relies on three-dimensional pore structure, efficiently captures small suspended particles (such as phosphating residue fine powder), polyvinylidene fluoride membrane removes submicron colloidal particles and heavy metal hydroxide precipitate, three-stage filter material synergistic effect effectively avoids the rapid blockage caused by single filter material due to complex impurity type, significantly improves filtration precision and overall processing efficiency, reduces subsequent process load and operating cost.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, specifically to a coating wastewater filtration device. Background Technology

[0002] Coating processes (such as spray painting, electrophoresis, and spraying) generate a large amount of coating wastewater. This type of wastewater contains high concentrations of suspended solids (SS, mainly paint residue and pigment particles, with a particle size of 0.1-10 mm), organic matter, and heavy metal ions. If discharged directly or without effective pretreatment, it will seriously pollute the aquatic environment and increase the load and cost of subsequent treatment processes.

[0003] The existing patent document CN222293703U discloses a coating wastewater filtration device. This utility model, by setting up a tank, a cover, and a collection component, allows the entire process of wastewater treatment to be carried out in a sealed structure, preventing the emission of chemically irritating odors and ensuring the health of operators. Furthermore, the internal oil filter baffle and particle baffle separate paint oil, particles, and water in the wastewater, ensuring a clear separation between them and preventing the direct discharge of unfiltered wastewater, thus improving the efficiency of wastewater treatment.

[0004] However, existing painting wastewater filtration devices are not suitable for precise classification and interception of impurities of different particle sizes. Although existing filtration devices achieve basic separation of paint oil and particles through oil filter baffles and particle baffles, they rely on a single-level baffle structure and cannot intercept impurities of different particle sizes such as paint sludge clumps, fine suspended particles, and submicron colloids in a step-by-step manner, as can be done with a three-stage design of "coarse filter + fine filter + microfiltration membrane". Large particles are prone to clogging due to direct impact of impurities on fine separation components, which shortens the service life of the core filtration components. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] The purpose of this invention is to provide a coating wastewater filtration device to solve the problem mentioned in the background art that existing coating wastewater filtration devices are not convenient for accurately classifying and intercepting impurities of different particle sizes.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, this utility model provides the following technical solution: a coating wastewater filtration device, comprising a filter tank, wherein a coarse filter screen, a fine filter screen, and a microfiltration membrane are horizontally arranged sequentially from top to bottom along the height direction inside the filter tank, wherein the coarse filter screen is made of polypropylene woven mesh, the fine filter screen is made of polyester meltblown nonwoven fabric, and the microfiltration membrane is made of polyvinylidene fluoride material.

[0009] As a further improvement to the above solution, a controller is integrated and installed on the outer surface of the filter tank, and a wastewater inlet pipe is provided in the middle of the top of the filter tank. A flow sensor is installed on the outer wall of the wastewater inlet pipe.

[0010] As a further improvement to the above solution, the detection probe of the flow sensor extends radially along the pipeline to the turbulent zone inside the wastewater inlet pipe, and a tempered glass observation window is embedded on one side of the filter tank, the height of which covers the arrangement range of the coarse filter screen, fine filter screen and microfiltration membrane.

[0011] As a further improvement to the above solution, a set of differential pressure sensors is respectively installed on the inner wall of the filter tank corresponding to the coarse filter screen, fine filter screen and microfiltration membrane. Each set of differential pressure sensors includes two detection units, which are respectively installed on the upstream inlet side and the downstream outlet side of the corresponding filter media.

[0012] As a further improvement to the above solution, a purified water outlet pipe is provided in the middle of the bottom of the filter tank. A water quality sensor is installed on the outer wall of the purified water outlet pipe. The detection end of the water quality sensor extends into the interior of the purified water outlet pipe. The outer sides of the coarse filter, fine filter, and microfiltration membrane are all fixed with annular support plates by welding.

[0013] As a further improvement to the above solution, the annular support plate and the horizontal groove opened on the side wall of the filter tank form a pull-out sliding fit. The outer end of the annular support plate is integrally formed with an arc-shaped sealing plate. The inner arc surface of the arc-shaped sealing plate is perfectly matched with the arc of the outer surface of the filter tank, and an acid and alkali resistant nitrile rubber sealing gasket is pasted on the mating surface.

[0014] As a further improvement to the above solution, the two ends of the outer side of the arc-shaped sealing plate are connected with connecting bolts, which pass through the arc-shaped sealing plate and are movably connected to the threaded holes preset on the side wall of the filter tank.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. This coating wastewater filtration device employs a three-stage progressive filtration combination of "coarse filter + fine filter + microfiltration membrane" to precisely match the impurity characteristics of the coating wastewater and achieve efficient purification. Among them, the polypropylene woven mesh, with its excellent acid and alkali resistance, can stably intercept paint slag clumps and workpiece debris with a particle size ≥100μm in the wastewater. The polyester meltblown nonwoven fabric, relying on its three-dimensional porous structure, efficiently captures fine suspended particles of 10-50μm (such as fine powder of phosphating slag). The polyvinylidene fluoride membrane, with a high-precision filtration of 0.1-1μm, thoroughly removes submicron colloidal particles and heavy metal hydroxide precipitates. The synergistic effect of the three-stage filter media effectively avoids rapid clogging of a single filter media due to the complexity of impurity types, significantly improves filtration accuracy and overall treatment efficiency, provides high-quality feed water for subsequent deep treatment processes such as biochemical and membrane separation, and reduces the subsequent process load and operating costs.

[0017] 2. This coating wastewater filtration device constructs a full-process monitoring system through the intelligent linkage of a flow sensor, three sets of differential pressure sensors, a water quality sensor, and a controller. This enables the visualization and automated control of the filtration process. The flow sensor's detection probe penetrates deep into the turbulent zone of the wastewater inlet pipe to capture fluctuations in the inlet flow rate in real time, allowing the controller to adjust the inlet rate promptly and prevent filter media overload. The three sets of differential pressure sensors monitor the upstream and downstream pressure differences of the coarse filter, fine filter, and microfiltration membrane, respectively, providing accurate feedback on the degree of clogging of each filter media. The water quality sensor continuously monitors the water quality of the purified water outlet pipe to ensure that the effluent indicators meet the standards. When the sensors detect abnormal data (such as excessive differential pressure at a certain level or abnormal effluent water quality), the controller can quickly issue an early warning, reminding the operator to start backwashing or replace the filter media, significantly reducing manual inspection costs and ensuring continuous and stable operation of the device.

[0018] 3. This coating wastewater filtration device achieves the dual goals of convenient filter media removal and reliable sealing through a pull-out sliding fit between the annular support plate and the filter tank, combined with the sealing structure of the arc-shaped sealing plate. The annular support plate is fixed to the filter media by welding, and the filter media can be removed by pulling along the horizontal groove on the side wall of the tank, without the need to disassemble complex flanges or bolts. It can be operated by a single person, shortening maintenance time compared to traditional fixing methods. The inner arc surface of the arc-shaped sealing plate is precisely matched with the outer surface of the tank, and the acid and alkali resistant nitrile rubber sealing gasket on the contact surface can be tightly compressed after the connecting bolt is tightened, effectively preventing wastewater leakage from the pull-out gap. At the same time, the sealing gasket is resistant to acid and alkali corrosion of coating wastewater, avoiding sealing failure caused by long-term use. This not only improves the convenience of filter media maintenance but also ensures the sealing performance and safety of the device operation. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0020] Figure 2 This is a three-dimensional structural diagram of the filter tank of this utility model;

[0021] Figure 3 This is a three-dimensional structural diagram of the annular support plate of this utility model;

[0022] Figure 4 This is a three-dimensional structural diagram of the arc-shaped sealing plate of this utility model.

[0023] In the diagram: 1. Filter tank; 2. Coarse filter screen; 3. Fine filter screen; 4. Microfiltration membrane; 5. Controller; 6. Wastewater inlet pipe; 7. Flow sensor; 8. Observation window; 9. Differential pressure sensor; 10. Clean water outlet pipe; 11. Water quality sensor; 12. Annular support plate; 13. Arc-shaped sealing plate; 14. Connecting bolt. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figure 1 - Figure 4 This utility model provides a technical solution: a coating wastewater filtration device, including a filter tank 1. Inside the filter tank 1, a coarse filter 2, a fine filter 3 and a microfiltration membrane 4 are arranged horizontally from top to bottom along the height direction. The coarse filter 2 is made of polypropylene woven mesh, the fine filter 3 is made of polyester meltblown nonwoven fabric, and the microfiltration membrane 4 is made of polyvinylidene fluoride.

[0026] After entering the filter tank 1 through the wastewater inlet pipe 6, the painting wastewater flows sequentially through three-stage filtration units from top to bottom inside the tank. Deep purification is achieved through a stepped interception process. First, the raw water contacts the coarse filter screen 2 (polypropylene woven mesh). Utilizing its acid and alkali corrosion resistance and the mechanical interception effect of its specific pore size, it efficiently traps large paint sludge clumps, metal workpiece debris, and fibrous impurities in the water, preventing these large particles from directly impacting the subsequent fine filtration components and avoiding the risk of clogging. The water pre-treated by the coarse filtration continues to permeate downwards to the fine filter screen 3 (polyester meltblown nonwoven fabric), whose three-dimensional pore structure forms multi-layer filtration channels. Through the dual action of inertial collision and surface adsorption, fine suspended particles (such as fine phosphate slag powder and pigment particles) in the water are precisely captured. The oxidation resistance of the polyester material can resist residual oxidants in the wastewater, ensuring the long-term stable operation of the filter material and avoiding the decline in filtration performance due to chemical corrosion. Finally, the water flows to the microfiltration membrane 4 (polyvinylidene fluoride material), whose high-precision filtration characteristics can completely intercept submicron colloidal particles, heavy metal hydroxide precipitates and tiny microorganisms in the water. The hydrophobic surface of the polyvinylidene fluoride material can reduce the adhesion of organic pollutants and maintain stable water permeability. The purified water is finally discharged from the purified water outlet pipe 10.

[0027] A controller 5 is integrated on the outer surface of the filter tank 1. A wastewater inlet pipe 6 is located at the middle of the top of the filter tank 1. A flow sensor 7 is installed on the outer wall of the wastewater inlet pipe 6. The detection probe of the flow sensor 7 extends radially along the pipe to the turbulent zone inside the wastewater inlet pipe 6. A tempered glass observation window 8 is embedded on one side of the filter tank 1. The height of the observation window 8 covers the arrangement range of the coarse filter screen 2, fine filter screen 3, and microfiltration membrane 4. A set of differential pressure sensors 9 is installed on the inner wall of the filter tank 1 corresponding to the coarse filter screen 2, fine filter screen 3, and microfiltration membrane 4, respectively. Each set of differential pressure sensors 9 contains two detection units, which are installed on the upstream inlet side and the downstream outlet side of the corresponding filter media, respectively. A clean water outlet pipe 10 is located at the middle of the bottom of the filter tank 1. A water quality sensor 11 is installed on the outer wall of the purified water outlet pipe 10. The detection end of the water quality sensor 11 extends into the interior of the purified water outlet pipe 10. The outer sides of the coarse filter screen 2, fine filter screen 3 and microfiltration membrane 4 are all fixed with annular support plates 12 by welding. The annular support plate 12 and the horizontal groove opened on the side wall of the filter tank 1 form a pull-out sliding fit. An arc-shaped sealing plate 13 is integrally formed on the outer end of the annular support plate 12. The inner arc surface of the arc-shaped sealing plate 13 is completely matched with the arc of the outer surface of the filter tank 1, and an acid and alkali resistant nitrile rubber sealing gasket is pasted on the mating surface. The two ends of the outer side of the arc-shaped sealing plate 13 are connected with connecting bolts 14. The connecting bolts 14 pass through the arc-shaped sealing plate 13 and are movably connected to the threaded holes preset on the side wall of the filter tank 1.

[0028] During system operation, the various sensors and controller 5 (programmable logic controller processor) form a collaborative monitoring system. Flow sensor 7 (FD-M series electromagnetic sensor) collects influent flow data in real time and transmits it to controller 5 to dynamically monitor influent stability. Three sets of differential pressure sensors 9 (KONICS differential pressure gauges) monitor the pressure difference upstream and downstream of each stage of filter media, directly reflecting the degree of filter media clogging through pressure changes. Water quality sensor 11 (SD7500 general-purpose differential pH sensor) continuously monitors effluent water quality indicators to ensure that the purification effect meets discharge requirements. When controller 5 detects an abnormal increase in pressure difference of a certain stage of filter media or that the effluent water quality does not meet standards, the operator can observe through the tempered glass. Window 8 allows direct viewing of the contamination status of each level of filter media, enabling assessment of maintenance needs. During filter media maintenance, simply loosen the connecting bolts 14 at both ends of the arc-shaped sealing plate 13, and pull out the annular support plate 12, which holds the filter media, along the horizontal groove on the tank side wall. This allows for quick replacement or cleaning of the corresponding filter media. Upon reinstallation, the acid- and alkali-resistant nitrile rubber sealing gasket on the inner side of the arc-shaped sealing plate 13 will tighten with the connecting bolts 14, forming a reliable seal that effectively prevents wastewater leakage from the pull-out gap, ensuring the airtightness and safety of the filtration process. Controller 5 comprehensively analyzes various monitoring data, intelligently prompting maintenance priorities to assist operators in efficiently carrying out maintenance work and ensuring the continuous and stable operation of the device.

[0029] Working Principle: After entering the filter tank 1 through the wastewater inlet pipe 6, the painting wastewater flows from top to bottom through three-stage filtration units. Deep purification is achieved through step-by-step interception. First, the raw water contacts the coarse filter screen 2 (polypropylene woven mesh). Utilizing its acid and alkali corrosion resistance and the mechanical interception effect of its specific pore size, it efficiently traps large paint sludge clumps, metal workpiece fragments, and fibrous impurities in the water, preventing these large particles from directly impacting the subsequent fine filtration components and avoiding clogging risks. The water pre-treated by the coarse filtration continues to permeate downwards to the fine filter screen 3 (polyester meltblown nonwoven fabric). Its three-dimensional pore structure forms multi-layer filtration channels, which, through inertial collision and... The dual action of surface adsorption precisely captures fine suspended particles in the water (such as fine phosphate slag powder and pigment particles). The oxidation resistance of the polyester material can resist residual oxidants in the wastewater, ensuring long-term stable operation of the filter media and avoiding the decline in filtration performance due to chemical corrosion. Finally, the water flows to the microfiltration membrane 4 (polyvinylidene fluoride material), whose high-precision filtration characteristics can completely intercept submicron-sized colloidal particles, heavy metal hydroxide precipitates, and tiny microorganisms in the water. The hydrophobic surface of the polyvinylidene fluoride material can reduce the adhesion of organic pollutants and maintain stable water permeability. The purified water is finally discharged from the purified water outlet pipe 10. During system operation, various sensors and controllers 5 (programmable) A collaborative monitoring system is formed by the programmable logic controller (PLC) processor. Flow sensor 7 (FD-M series electromagnetic sensor) collects influent flow data in real time and transmits it to controller 5 to dynamically monitor influent stability. Three sets of differential pressure sensors 9 (KONICS differential pressure gauges) monitor the pressure difference between the upstream and downstream of each stage of filter media, directly reflecting the degree of filter media clogging through pressure changes. Water quality sensor 11 (SD7500 general-purpose differential pH sensor) continuously monitors effluent water quality indicators to ensure that the purification effect meets discharge requirements. When controller 5 detects an abnormal increase in the pressure difference of a certain stage of filter media or that the effluent water quality does not meet the standards, the operator can directly view each stage of the filter media through the tempered glass observation window 8. The system assesses the contamination status of the filter media to determine maintenance needs. When performing filter media maintenance, simply loosen the connecting bolts 14 at both ends of the arc-shaped sealing plate 13, and pull out the annular support plate 12, which holds the filter media, along the horizontal groove on the side wall of the tank. This allows for quick replacement or cleaning of the corresponding filter media. During reinstallation, the acid- and alkali-resistant nitrile rubber sealing gasket on the inner side of the arc-shaped sealing plate 13 will tighten along with the connecting bolts 14, forming a reliable seal that effectively prevents wastewater leakage from the pull-out gap, ensuring the airtightness and safety of the filtration process. The controller 5 comprehensively analyzes various monitoring data, intelligently prompting maintenance priorities to help operators efficiently carry out maintenance work and ensure the continuous and stable operation of the device.

[0030] Finally, it should be noted that the above content is only used to illustrate the technical solution of this utility model, and is not intended to limit the scope of protection of this utility model. Simple modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model do not depart from the essence and scope of the technical solution of this utility model.

Claims

1. A coating wastewater filtration device, comprising a filter tank (1), characterized in that: The filter tank (1) is horizontally arranged from top to bottom along the height direction with a coarse filter (2), a fine filter (3) and a microfiltration membrane (4), wherein the coarse filter (2) is made of polypropylene woven mesh, the fine filter (3) is made of polyester meltblown nonwoven fabric, and the microfiltration membrane (4) is made of polyvinylidene fluoride.

2. The coating wastewater filtration device according to claim 1, characterized in that: A controller (5) is integrated on the outer surface of the filter tank (1), and a wastewater inlet pipe (6) is provided at the middle of the top of the filter tank (1). A flow sensor (7) is installed on the outer wall of the wastewater inlet pipe (6).

3. The coating wastewater filtration device according to claim 2, characterized in that: The detection probe of the flow sensor (7) extends radially along the pipe to the turbulent zone inside the wastewater inlet pipe (6). A tempered glass observation window (8) is embedded on one side of the filter tank (1). The height of the observation window (8) covers the arrangement range of the coarse filter screen (2), fine filter screen (3) and microfiltration membrane (4).

4. The coating wastewater filtration device according to claim 1, characterized in that: The inner wall of the filter tank (1) is provided with a set of differential pressure sensors (9) corresponding to the coarse filter screen (2), fine filter screen (3) and microfiltration membrane (4). Each set of differential pressure sensors (9) contains two detection units, which are installed on the upstream inlet side and the downstream outlet side of the corresponding filter media, respectively.

5. The coating wastewater filtration device according to claim 1, characterized in that: A purified water outlet pipe (10) is provided in the middle of the bottom of the filter tank (1). A water quality sensor (11) is installed on the outer wall of the purified water outlet pipe (10). The detection end of the water quality sensor (11) extends into the interior of the purified water outlet pipe (10). The outer sides of the coarse filter screen (2), fine filter screen (3) and microfiltration membrane (4) are all fixed with annular support plates (12) by welding.

6. The coating wastewater filtration device according to claim 5, characterized in that: The annular support plate (12) and the horizontal groove opened on the side wall of the filter tank (1) form a pull-out sliding fit. The outer end of the annular support plate (12) is integrally formed with an arc-shaped sealing plate (13). The inner arc surface of the arc-shaped sealing plate (13) is completely matched with the arc of the outer surface of the filter tank (1), and the mating surface is pasted with an acid and alkali resistant nitrile rubber sealing gasket.

7. A coating wastewater filtration device according to claim 6, characterized in that: The two ends of the outer side of the arc-shaped sealing plate (13) are connected to the connecting bolts (14), and the connecting bolts (14) pass through the arc-shaped sealing plate (13) and are movably connected to the threaded holes preset on the side wall of the filter tank (1).

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