Spraying wastewater treatment process

Abstract

The invention relates to the technical field of spraying wastewater treatment, and particularly discloses a spraying wastewater treatment process which comprises a wastewater treatment tank. The spraying wastewater treatment device further comprises a plurality of reagent tanks, a uniform mixing mechanism located on the outer side of the wastewater treatment box, a detection mechanism located in the wastewater treatment box, and a feedback adjusting mechanism located at the end of the conveying pipe. The dosage of a demulsifier, a coagulant and a flocculant can be dynamically adjusted according to the wastewater emulsification degree and the floc forming state, the actual working conditions of complex wastewater sources and large component fluctuation are adapted, the problem of incomplete demulsification or reagent waste caused by traditional fixed dosage is avoided, manual inspection and subjective adjustment are replaced, the dosage of the reagent is dynamically adjusted according to needs, and the work efficiency is improved. The problem of adjustment hysteresis of a traditional process is solved, excessive adding is avoided, and the operation and maintenance cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of spray painting wastewater treatment technology, specifically a spray painting wastewater treatment process. Background Technology

[0002] Spray painting wastewater treatment involves purifying the wastewater generated during the production processes of spray painting, coating, baking, and electrophoresis. In the spray painting wastewater treatment process, the staff first collects the wastewater, then homogenizes and equalizes the volume, adjusts the pH, and stabilizes the water quality. After that, demulsifiers, coagulants, flocculants, and other reagents are added to demulsify, coagulate, and flocculate the paint residue. Then, solid-liquid separation, hydrolysis acidification, and biochemical treatment are carried out. Finally, the wastewater undergoes deep treatment with activated carbon / ozone and other methods to meet the standards before being discharged or reused.

[0003] However, in actual production processes, wastewater sources are complex, and the types of paint, cleaning agents used, and discharge volumes fluctuate significantly, leading to constant changes in the degree of emulsification and pollutant concentrations. Spray painting wastewater contains large amounts of resin, emulsions, surfactants, electrophoretic paint, and degreasers, forming a stable emulsion system. In existing spray painting wastewater treatment methods, demulsifiers are often added using fixed-flow metering pumps. The dosage is determined through preliminary beaker tests (i.e., taking wastewater samples, adding different amounts of demulsifier, and observing which concentration results in the desired demulsification and whitening), and is manually set. Subsequent manual inspections and rough adjustments based on observation are necessary. This process is not only lagging and subjective, but also fails to guarantee stable demulsification. Furthermore, incomplete demulsification prevents paint residue from effectively flocculating into dense flocs, resulting in poor solid-liquid separation and high levels of suspended solids and COD in the effluent. Therefore, we propose a new spray painting wastewater treatment process. Summary of the Invention

[0004] The purpose of this invention is to provide a spray painting wastewater treatment process to solve the problems mentioned in the background art, which rely on rough adjustments by manual observation. This process is not only lagging and subjective, but also cannot guarantee a stable demulsification effect. Furthermore, incomplete demulsification will result in paint residue not being able to effectively flocculate into dense flocs, leading to poor solid-liquid separation and high levels of suspended solids and COD in the effluent.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a spraying wastewater treatment process, including a wastewater treatment tank; and also including multiple reagent tanks. The wastewater treatment tank is provided with a demulsification reaction chamber, a coagulation reaction chamber, a flocculation reaction chamber and a solid-liquid separation chamber. The reagent tanks are connected to a transmission pipe on the outside, and the multiple transmission pipes are respectively connected to the demulsification reaction chamber, the coagulation reaction chamber and the flocculation reaction chamber. The mixing mechanism is located outside the wastewater treatment tank. The mixing mechanism applies different stirring speeds to the demulsification reaction chamber, the coagulation reaction chamber, and the flocculation reaction chamber. The testing agency is located inside the wastewater treatment tank. The mixing mechanism mixes the wastewater and reagents in the demulsification reaction chamber, coagulation reaction chamber and flocculation reaction chamber. The testing agency then monitors the water quality fluctuations flowing through the wastewater in real time. The feedback adjustment mechanism, located at the end of the transmission pipe, adjusts the reagent dosage in the demulsification reaction chamber, coagulation reaction chamber, and flocculation reaction chamber based on the test results from the testing mechanism.

[0006] The mixing mechanism includes stirring rods located in the demulsification reaction chamber, coagulation reaction chamber, and flocculation reaction chamber, respectively. The stirring rods are rotatably connected to the inner wall of the wastewater treatment tank. A transmission gear is fixedly connected to the end of the stirring rod. The module of the transmission gear corresponding to the demulsification reaction chamber, coagulation reaction chamber, and flocculation reaction chamber increases sequentially. The surface of the wastewater treatment tank is provided with a drive component that simultaneously drives multiple transmission gears to rotate.

[0007] The drive component includes multiple transmission gears II, which have the same module. The multiple transmission gears II mesh with multiple transmission gears I respectively. The transmission gears II are rotatably connected to the wastewater treatment tank. A drive gear is coaxially fixedly connected to the outside of the transmission gears II. Toothed belts mesh with the outside of the multiple drive gears. A rotary motor is fixedly connected to the outside of one of the drive gears.

[0008] The testing mechanism includes an inlet pipe connected to the demulsification reaction chamber, a centrifugal pump installed on the surface of the wastewater treatment tank, an inlet pipe connected to the centrifugal pump, a three-way solenoid valve connected to the end of the inlet pipe away from the centrifugal pump, a drain pipe connected to the outside of the three-way solenoid valve to the outside of the drain pipe to the drain pipe to the drain pipe to the drain pipe to the drain pipe to the coagulation reaction chamber, a colorimetric detector for detecting the color of the wastewater inside the inlet pipe on the outside of the inlet pipe, and a floc detector for detecting the degree of polymerization of the scum in the wastewater inside the solid-liquid separation chamber.

[0009] The colorimetric detection component includes a colorimetric sensor installed on the outside of the inlet pipe, which is fixed to the wastewater treatment tank. A controller is installed on the outside of the colorimetric sensor and is connected to a three-way solenoid valve.

[0010] The solid-liquid separation chamber includes a waste liquid collection chamber and a scum collection chamber. The floc detection component includes a base fixedly connected to the inner wall of the scum collection chamber. A rotating rod is rotatably connected to the inner wall of the base. A sieve plate is fixedly connected to the outer side of the rotating rod, and the sieve plate blocks the opening of the base. A spiral spring is fixedly connected to the outer side of the rotating rod. The end of the spiral spring away from the rotating rod is fixed to the inner wall of the base. A contact is fixedly connected to the end of the rotating rod. A trigger button is installed on the inner wall of the base. The trigger button is connected to a controller. The controller collects the trigger frequency of the trigger button. The inner wall of the solid-liquid separation chamber is equipped with a scraper to scrape the scum on the top of the waste liquid collection chamber into the scum collection chamber.

[0011] The scraping component includes a scraper that is slidably connected to the inner wall of the waste liquid collection chamber. A connecting frame is fixedly connected to the top of the scraper. A transmission screw is threadedly connected inside the connecting frame. The transmission screw is rotatably connected to the inner wall of the wastewater treatment tank. A drive motor is fixedly connected to the end of the transmission screw. The drive motor is installed on the surface of the wastewater treatment tank.

[0012] The feedback adjustment mechanism includes an adjustment box connected to the transmission pipe. A sealing plate is rotatably connected to the inner wall of the adjustment box. A rotating shaft is fixedly connected to the inner wall of the sealing plate. The rotating shaft is rotatably connected to the inner wall of the adjustment box. A transmission gear three is fixedly connected to the end of the rotating shaft. A toothed plate is fixedly connected to the outer side of the transmission gear three. A moving part that drives the toothed plate to move is provided on the inner wall of the adjustment box. A return spring is fixedly connected to the outer side of the toothed plate. The return spring is fixed to the inner wall of the adjustment box.

[0013] The moving part includes a connecting rod fixedly connected to the toothed plate, a sealing chamber opened on the inner wall of the adjusting box, a piston plate slidably connected to the inner wall of the sealing chamber, the piston plate being fixed to the connecting rod, an air inlet opening on the top of the sealing chamber, a three-way solenoid valve two fixedly connected to the top of the adjusting box, the three-way solenoid valve two being connected to the controller, an air inlet pipe and an exhaust pipe connected to the outside of the three-way solenoid valve two, an air pump installed on the outside of the wastewater treatment tank, multiple air inlet pipes being connected to the air pump respectively, and the controller controlling the air passage status of different three-way solenoid valves two.

[0014] A process for treating spray painting wastewater includes the following steps: S1: The spraying wastewater after pH conditioning flows into the demulsification reaction chamber through the inlet in the wastewater treatment tank. The reagent tank adds a fixed amount of demulsifier to the demulsification reaction chamber through the transfer pipe. The mixing mechanism quickly stirs the demulsification reaction chamber. After the demulsifier is mixed with the wastewater, the spraying wastewater is demulsified. S2: The wastewater containing the mixed demulsifier is extracted and tested by the testing agency. After the demulsification is completed, the testing agency pumps the wastewater in the demulsification reaction chamber into the coagulation reaction chamber. If the demulsification is not complete, the extracted wastewater is discharged back into the demulsification reaction chamber. The dosage of the demulsifier is quantitatively increased through the feedback adjustment mechanism until the demulsification is complete. S3: After the demulsified wastewater enters the coagulation reaction chamber, the corresponding reagent tank adds a preset amount of coagulant to the coagulation reaction chamber through the transfer pipe. The mixing mechanism rotates at a medium speed in the coagulation reaction chamber. After the coagulant mixes with the wastewater, the destabilized fine particles in the spraying wastewater agglomerate into tiny flocs. S4: After coagulation treatment, the spraying wastewater enters the flocculation reaction chamber. The corresponding reagent tank adds a preset amount of flocculant to the flocculation reaction chamber through the transfer pipe. The mixing mechanism rotates at low speed in the flocculation reaction chamber. After the flocculant mixes with the wastewater, the tiny flocs in the spraying wastewater become large and dense flocs. S5: After the spraying wastewater in the flocculation reaction chamber flows into the solid-liquid separation chamber, the scum on the top of the solid-liquid separation chamber is scraped off by the detection mechanism. The detection mechanism tests the scraped scum. If the scum is small particles, it means that the particles cannot aggregate into flocs, and the feedback adjustment mechanism increases the amount of coagulant added quantitatively. If the scum is fine flocs, it means that the flocculation is insufficient, and the feedback adjustment mechanism increases the amount of flocculant added quantitatively. S6: When the scum is detected by the testing agency as a stable large floc, it indicates that the reagent dosage in the demulsification reaction chamber, coagulation reaction chamber and flocculation reaction chamber is appropriate, and the wastewater after solid-liquid separation is discharged through the drain outlet of the wastewater treatment tank.

[0015] This invention has at least the following beneficial effects: When in use, this application, through the cooperation of a testing agency and a feedback adjustment agency, can dynamically adjust the dosage of demulsifier, coagulant, and flocculant according to the degree of emulsification and floc formation of wastewater. It adapts to the actual working conditions of complex wastewater sources and large fluctuations in composition, avoiding the problems of incomplete demulsification or reagent waste caused by traditional fixed dosage. It replaces manual inspection and subjective adjustment, and the reagent dosage is dynamically adjusted as needed, solving the problem of lagging adjustment in traditional processes, avoiding over-dosing, and reducing operation and maintenance costs. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall rear view structure of the present invention; Figure 3 This is a top view of the internal structure of the present invention; Figure 4 This is a schematic diagram of the mixing mechanism of the present invention; Figure 5 for Figure 1 Enlarged diagram of area A in the middle; Figure 6 for Figure 1 Enlarged diagram of area B in the middle; Figure 7 This is a side sectional view of the adjustment box structure of the present invention; Figure 8 This is a schematic diagram of the structure of the floc detection element of the present invention; Figure 9 This is a side sectional view of the base structure of the present invention; Figure 10 for Figure 9 Enlarged diagram of area C.

[0017] In the diagram: 1. Wastewater treatment tank; 2. Reagent tank; 20. Transfer pipe; 3. Demulsification reaction chamber; 4. Coagulation reaction chamber; 5. Flocculation reaction chamber; 6. Solid-liquid separation chamber; 60. Waste liquid collection chamber; 61. Scum collection chamber; 7. Mixing mechanism; 70. Stirring rod; 71. Transmission gear one; 72. Drive component; 73. Transmission gear two; 74. Drive gear; 75. Toothed belt; 76. Rotary motor; 8. Detection mechanism; 80. Inlet pipe; 81. Centrifugal pump; 82. Three-way solenoid valve one; 83. Drain pipe one; 84. Drain pipe two; 85. Colorimetric detection element; 86. Floc detection element; 87. Colorimetric sensor; 88. Controller; 89. Base; 810. Rotating rod; 811. Screen plate; 812. Scroll spring; 813. Contact; 814. Trigger button; 815. Scraper; 816. Scraper; 817. Connecting frame; 818. Transmission screw; 819. Drive motor; 90. Feedback adjustment mechanism; 91. Adjustment box; 92. Sealing plate; 93. Transmission gear three; 94. Gear plate; 95. Moving part; 96. Return spring; 97. Connecting rod; 98. Sealing chamber; 99. Piston plate; 910. Air inlet; 911. Three-way solenoid valve two; 912. Air inlet pipe; 913. Exhaust pipe; 914. Air pump. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Please see Figures 1 to 10 This invention provides a technical solution: a spraying wastewater treatment process, including a wastewater treatment tank 1; it also includes multiple reagent tanks 2, the wastewater treatment tank 1 having a demulsification reaction chamber 3, a coagulation reaction chamber 4, a flocculation reaction chamber 5, and a solid-liquid separation chamber 6, the reagent tanks 2 being connected to the outside of a transfer pipe 20, the multiple transfer pipes 20 being respectively connected to the demulsification reaction chamber 3, the coagulation reaction chamber 4, and the flocculation reaction chamber 5; and a mixing mechanism 7, located outside the wastewater treatment tank 1, the mixing mechanism 7 controlling the demulsification reaction chamber 3, the coagulation reaction chamber 4, and the solid-liquid separation chamber 6. Different stirring speeds are applied to the flocculation reaction chamber 5; the detection mechanism 8 is located inside the wastewater treatment tank 1; after the mixing mechanism 7 mixes the wastewater and reagents in the demulsification reaction chamber 3, coagulation reaction chamber 4 and flocculation reaction chamber 5, the detection mechanism 8 detects the water quality fluctuations flowing through the wastewater in real time; the feedback adjustment mechanism 9 is located at the end of the transmission pipe 20; based on the detection results of the detection mechanism 8, the feedback adjustment mechanism 9 adjusts the amount of reagent added in the demulsification reaction chamber 3, coagulation reaction chamber 4 and flocculation reaction chamber 5.

[0020] During use, the spraying wastewater is homogenized and equalized in the front-end equalization tank. The pH value is adjusted to 6.5-8.5 (adapted to the optimal pH range for demulsifier reaction) by the acid and alkali dosing device. The adjusted wastewater is sent into the demulsification reaction chamber 3 through the inlet. The liquid level sensor in the chamber (this is a supporting structure for the wastewater treatment tank 1) monitors the liquid level in real time. Feeding is stopped when the preset liquid level (80% of the chamber capacity) is reached. The demulsifier is a cationic polyquaternary ammonium salt demulsifier. The reagent tank 2 adds the preset amount of demulsifier to the demulsification reaction chamber 3 through the metering pump and the transmission pipe 20. The mixing mechanism 7 is started to make the demulsifier fully contact the wastewater and break the oil-water emulsion system. The testing agency 8 extracts wastewater from the demulsification reaction chamber 3 and monitors its color value in real time. If the color value of the wastewater in the demulsification reaction chamber 3 meets the standard, the testing agency 8 sends the spraying wastewater from the demulsification reaction chamber 3 into the coagulation reaction chamber 4. If the color value of the wastewater does not meet the standard, the testing agency 8 controls the feedback adjustment mechanism 9 to work. The feedback adjustment mechanism 9 quantitatively increases the amount of demulsifier added. After each adjustment, the mixture is stirred and tested again until the color value meets the standard, at which point the incremental adjustment stops. The coagulant used in the coagulation reaction chamber 4 is polyaluminum chloride (PAC, effective content 30%). The corresponding reagent tank 2 is added with a preset amount of coagulant through a metering pump. The mixing mechanism 7 rotates the coagulation reaction chamber 4 at a medium speed to fully mix the coagulant with the demulsified wastewater. Through the compression of the double electric layer, the destabilized fine particles in the wastewater are aggregated into micro flocs. After the coagulation reaction is completed, the wastewater is smoothly sent into the flocculation reaction chamber 5 through the bottom guide valve. The flocculant used in the flocculation reaction chamber 5 is anionic polyacrylamide. The corresponding reagent tank 2 is added with a preset amount of flocculant through a metering pump. The mixing mechanism 7 rotates at a low speed in the flocculation reaction chamber 5 and gently stirs to avoid damaging the flocs. This allows the tiny flocs to aggregate into large and dense flocs through adsorption bridging. After the flocculation reaction is completed, the wastewater containing the flocs is allowed to flow into the solid-liquid separation chamber 6 by gravity through the bottom guide valve. Inside the solid-liquid separation chamber 6, the flocs float to the surface under buoyancy. The detection mechanism 8 repeatedly scrapes off the scum on top of the wastewater and detects the size of the agglomerates of the scraped scum. The feedback adjustment mechanism 9 increases the dosage of coagulant and flocculant quantitatively according to the detection results. The qualified wastewater is discharged through the drain outlet of the wastewater treatment tank 1.

[0021] The mixing mechanism 7 includes stirring rods 70 located in the demulsification reaction chamber 3, the coagulation reaction chamber 4, and the flocculation reaction chamber 5, respectively. The stirring rods 70 are rotatably connected to the inner wall of the wastewater treatment tank 1. A transmission gear 71 is fixedly connected to the end of the stirring rod 70. The module of the transmission gear 71 corresponding to the demulsification reaction chamber 3, the coagulation reaction chamber 4, and the flocculation reaction chamber 5 increases sequentially. The larger the module, the larger the pitch circle diameter of the gear. The surface of the wastewater treatment tank 1 is provided with a drive component 72 that simultaneously drives multiple transmission gears 71 to rotate.

[0022] The drive unit 72 includes multiple transmission gears 73, which have the same module. The multiple transmission gears 73 mesh with multiple transmission gears 71 respectively. The transmission gears 73 are rotatably connected to the wastewater treatment tank 1. A drive gear 74 is coaxially fixedly connected to the outside of the transmission gears 73. A toothed belt 75 meshes with the outside of the multiple drive gears 74. A rotary motor 76 is fixedly connected to the outside of one of the drive gears 74.

[0023] When the mixing mechanism 7 is working, the rotary motor 76 drives the drive gear 74, which is fixedly connected to its output shaft, to rotate. The drive gear 74 drives the remaining two drive gears 74 to rotate through the toothed belt 75. When the drive gear 74 rotates, it drives multiple transmission gears 73 to rotate synchronously. The transmission gears 73 drive the transmission gears 71 that mesh with them to rotate. Since the multiple transmission gears 73 have the same module, while the transmission gears 71 corresponding to the demulsification reaction chamber 3, coagulation reaction chamber 4, and flocculation reaction chamber 5 have progressively increasing modules, the stirring rod 70 in the demulsification reaction chamber 3 rotates rapidly, so that the demulsifier and wastewater come into full contact, thus breaking the oil-water emulsion system. Inside the coagulation reaction chamber 4, the stirring rod 70 rotates at medium speed to fully mix the coagulant with the demulsified wastewater. Through the compression of the double electric layer, the destabilized fine particles in the wastewater aggregate into tiny flocs. Inside the flocculation reaction chamber 5, the stirring rod 70 rotates at a low speed, gently stirring to avoid damaging the flocs. This allows the tiny flocs to aggregate into large and dense flocs through adsorption bridging, matching the mixing requirements of different reaction stages.

[0024] The testing mechanism 8 includes an inlet pipe 80 connected to the demulsification reaction chamber 3, a centrifugal pump 81 installed on the surface of the wastewater treatment tank 1, the inlet pipe 80 connected to the centrifugal pump 81, a three-way solenoid valve 82 connected to the end of the inlet pipe 80 away from the centrifugal pump 81, a drain pipe 83 and a drain pipe 84 connected to the outside of the three-way solenoid valve 82 respectively, the drain pipe 83 connected to the demulsification reaction chamber 3, the drain pipe 84 connected to the coagulation reaction chamber 4, a colorimetric detector 85 for detecting the color of the wastewater inside the inlet pipe 80 is provided on the outside of the inlet pipe 80, and a floc detector 86 for detecting the degree of polymerization of the scum in the wastewater is provided inside the solid-liquid separation chamber 6.

[0025] After the stirring rod 70 stirs the demulsification reaction chamber 3, the centrifugal pump 81 operates, causing the wastewater in the demulsification reaction chamber 3 to enter the three-way solenoid valve 82 through the inlet pipe 80. In its initial state, the three-way solenoid valve 82 connects the inlet pipe 80 with the drain pipe 83. As the wastewater flows through the inlet pipe 80, the color of the wastewater is detected in real time by the colorimetric detector 85. If the detected value is ≤50Hazen (stable for 3 consecutive times), the controller 88 controls the three-way solenoid valve 1 82 to connect the drain pipe 2 84, sending the wastewater into the coagulation reaction chamber 4; If the detected value is >50 Hazen, the three-way solenoid valve 82 connects to the drain pipe 83, and the wastewater flows back to the demulsification reaction chamber 3. At the same time, the controller 88 sends a signal to the feedback adjustment mechanism 9, which quantitatively increases the amount of demulsifier added. After each adjustment, the mixture is stirred and tested again until the color value meets the standard, at which point the incremental adjustment stops. After the wastewater enters the solid-liquid separation chamber 6, the degree of polymerization of the wastewater scum is detected by the floc detection device 86.

[0026] The colorimetric detection component 85 includes a colorimetric sensor 87 installed on the outside of the water inlet pipe 80. The colorimetric sensor 87 is fixed to the wastewater treatment tank 1. A controller 88 is installed on the outside of the colorimetric sensor 87. The controller 88 is connected to a three-way solenoid valve 82.

[0027] The color sensor 87 is an online color sensor (a mature technology on the market, with a measurement range of 0-500 Hazen), installed in the middle of the inlet pipe 80, with a detection frequency of 1 time / second. Before demulsification, the spray wastewater contains emulsified oil and pigments, and its color value is usually 200-300 Hazen. After complete demulsification, the color value drops to below 50 Hazen (preset threshold). The controller 88 compares the detected value with the threshold in real time. If the detected value is greater than the threshold for 3 consecutive times, it is determined that the demulsification is incomplete, triggering wastewater recirculation and incremental addition of demulsifier.

[0028] The solid-liquid separation chamber 6 includes a waste liquid collection chamber 60 and a scum collection chamber 61. The floc detection component 86 includes a base 89 fixedly connected to the inner wall of the scum collection chamber 61. A rotating rod 810 is rotatably connected to the inner wall of the base 89. A screen plate 811 is fixedly connected to the outer side of the rotating rod 810, and the screen plate 811 covers the opening of the base 89. A spiral spring 812 is fixedly connected to the outer side of the rotating rod 810. The end of the spiral spring 812 away from the rotating rod 810 is fixed to the inner wall of the base 89. A contact 813 is fixedly connected to the end of the rotating rod 810. A trigger button 814 is installed on the inner wall of the base 89. The trigger button 814 is connected to a controller 88. The controller 88 collects the trigger frequency of the trigger button 814. The inner wall of the solid-liquid separation chamber 6 is provided with a scraper 815 for scraping the scum on the top of the waste liquid collection chamber 60 into the scum collection chamber 61.

[0029] During use, wastewater containing coagulant and flocculant is mixed sequentially and enters the waste liquid collection chamber 60. The flocs float to the surface under buoyancy. The scum on the top of the waste liquid collection chamber 60 is scraped into the scum collection chamber 61 by the scraper 815. The scum impacts the screen plate 811 under gravity. When the scum is in small particles, the particles pass through the screen holes quickly. The time interval between each rotation of the screen plate 811 is >5 seconds, and the trigger interval of the trigger button 814 is 5 seconds. When the scum is fine flocculent, it partially blocks the screen holes. The time interval between each rotation of the screen plate 811 is 2-5 seconds, and the trigger interval of the trigger button 814 is 2-5 seconds. When the scum is in the form of large flocs, the impact force on screen plate 811 when it falls is large, the time interval between each rotation of screen plate 811 is less than 2 seconds, and the trigger interval of trigger button 814 is also less than 2 seconds. Controller 88 counts the trigger time of trigger button 814 to determine the flocculation effect. If the time interval between each rotation of the trigger button 814 is greater than 5 seconds, it is determined that the coagulation is insufficient. The controller 88 controls the feedback adjustment mechanism 9 to increase the amount of coagulant added, and the monitoring continues after adjustment. If the time interval between each rotation of the trigger button 814 is 2-5 seconds, it is determined that the flocculation is insufficient. The controller 88 controls the feedback adjustment mechanism 9 to increase the amount of flocculant added, and the monitoring continues after adjustment. Repeat the adjustment until the time interval between each rotation is less than 2 seconds, then stop the incremental adjustment and maintain the current dosage.

[0030] The scraping component 815 includes a scraper 816 that is slidably connected to the inner wall of the waste liquid collection chamber 60. A connecting frame 817 is fixedly connected to the top of the scraper 816. A transmission screw 818 is threadedly connected inside the connecting frame 817. The transmission screw 818 is rotatably connected to the inner wall of the wastewater treatment tank 1. A drive motor 819 is fixedly connected to the end of the transmission screw 818. The drive motor 819 is mounted on the surface of the wastewater treatment tank 1.

[0031] When the scraper 815 is working, the drive motor 819 drives the transmission screw 818 to rotate, and the transmission screw 818 drives the scraper 816 to slide on the inner wall of the waste liquid collection chamber 60. When the scraper 816 moves, it scrapes the scum on the top of the waste liquid collection chamber 60 to the scum collection chamber 61.

[0032] The feedback adjustment mechanism 9 includes an adjustment box 90 connected to the transmission pipe 20. A sealing plate 91 is rotatably connected to the inner wall of the adjustment box 90. A rotating shaft 92 is fixedly connected to the inner wall of the sealing plate 91. The rotating shaft 92 is rotatably connected to the inner wall of the adjustment box 90. A transmission gear 93 is fixedly connected to the end of the rotating shaft 92. A toothed plate 94 is fixedly connected to the outer side of the transmission gear 93. A moving part 95 that drives the toothed plate 94 to move is provided on the inner wall of the adjustment box 90. A return spring 96 is fixedly connected to the outer side of the toothed plate 94. The return spring 96 is fixed to the inner wall of the adjustment box 90.

[0033] The movable component 95 includes a connecting rod 97 fixedly connected to the toothed plate 94. A sealing chamber 98 is opened on the inner wall of the regulating box 90. A piston plate 99 is slidably connected to the inner wall of the sealing chamber 98. The piston plate 99 is fixed to the connecting rod 97. An air inlet 910 is opened on the top of the sealing chamber 98. A three-way solenoid valve 911 is fixedly connected to the top of the regulating box 90. The three-way solenoid valve 911 is connected to the controller 88. An air inlet pipe 912 and an exhaust pipe 913 are connected to the outside of the three-way solenoid valve 911. Initially, the three-way solenoid valve 911 controls the air inlet pipe 912 to connect with the air inlet 910. An air pump 914 is installed on the outside of the wastewater treatment tank 1. Multiple air inlet pipes 912 are respectively connected to the external air pump 914. The controller 88 controls the air passage status of different three-way solenoid valves 911.

[0034] The initial opening of the inner sealing plate 91 of the regulating box 90 corresponds to the preset dosage. If the color value detected by the color sensor 87 is greater than 50 Hazen during the demulsification stage, the feedback regulating mechanism 9 connected to the demulsification reaction chamber 3 starts to work. If the trigger interval of the trigger button 814 is greater than 5 seconds, the feedback regulating mechanism 9 connected to the coagulation reaction chamber 4 starts to work. If the trigger interval of the trigger button 814 is 2-5 seconds, the feedback regulating mechanism 9 connected to the flocculation reaction chamber 5 works. When the feedback adjustment mechanism 9 is working, the external air pump 914 charges a certain amount of gas into the air inlet 910 through the air inlet pipe 912. After this gas enters the sealed chamber 98, the air pressure inside the sealed chamber 98 increases. The increased air pressure pushes the piston plate 99 to slide on the inner wall of the sealed chamber 98. The piston plate 99 drives the toothed plate 94 to move through the connecting rod 97. The toothed plate 94 drives the transmission gear 93 to rotate. The transmission gear 93 drives the sealing plate 91 to rotate through the rotating shaft 92, thereby increasing the communication area of ​​the adjustment box 90. As the deformation degree of the return spring 96 increases, when a certain amount of gas is charged into the sealed chamber 98 again, the movement range of the piston plate 99 will become shorter and shorter. Thus, the adjustment range of the sealing plate 91 will be smaller after each adjustment, avoiding excessive reagent addition due to large adjustment range. When the sealing plate 91 is reset, the three-way solenoid valve 911 controls the air inlet 910 to connect with the exhaust pipe 913. The return spring 96, which is in a stretched state, drives the toothed plate 94 to reset. The toothed plate 94 drives the piston plate 99 to reset through the connecting rod 97. The gas in the sealing chamber 98 is discharged through the exhaust pipe 913.

[0035] A process for treating spray painting wastewater includes the following steps: S1: The spraying wastewater after pH conditioning flows into the demulsification reaction chamber 3 through the inlet in the wastewater treatment tank 1. The reagent tank 2 adds a fixed amount of demulsifier to the demulsification reaction chamber 3 through the transfer pipe 20. The mixing mechanism 7 quickly stirs the demulsification reaction chamber 3. The demulsifier and wastewater are mixed to demulsify the spraying wastewater. S2: The wastewater containing the mixed demulsifier is extracted and tested by the testing mechanism 8. After the demulsification is completed, the testing mechanism 8 pumps the wastewater in the demulsification reaction chamber 3 into the coagulation reaction chamber 4. If the demulsification is not complete, the extracted wastewater is discharged back into the demulsification reaction chamber 3. The dosage of the demulsifier is quantitatively increased by the feedback adjustment mechanism 9 until the demulsification is complete. S3: After the demulsified wastewater enters the coagulation reaction chamber 4, the corresponding reagent tank 2 adds a preset amount of coagulant to the coagulation reaction chamber 4 through the transfer pipe 20. The mixing mechanism 7 rotates at a medium speed inside the coagulation reaction chamber 4. After the coagulant is mixed with the wastewater, the destabilized fine particles in the spraying wastewater agglomerate into tiny flocs. S4: The spraying wastewater after coagulation treatment enters the flocculation reaction chamber 5. The corresponding reagent tank 2 adds a preset amount of flocculant to the flocculation reaction chamber 5 through the transfer pipe 20. The mixing mechanism 7 rotates at low speed inside the flocculation reaction chamber 5. After the flocculant mixes with the wastewater, the tiny flocs in the spraying wastewater become large and dense flocs. S5: After the spraying wastewater in the flocculation reaction chamber 5 flows into the solid-liquid separation chamber 6, the scum on the top of the solid-liquid separation chamber 6 is scraped off by the detection mechanism 8. The detection mechanism 8 detects the scraped scum. If the scum is small particles, it means that the particles cannot aggregate into flocs. The feedback adjustment mechanism 9 quantitatively increases the amount of coagulant added. If the scum is fine flocs, it means that the flocculation is insufficient. The feedback adjustment mechanism 9 quantitatively increases the amount of flocculant added. S6: When the scum is detected as a stable large floc by the testing agency 8, it indicates that the reagent dosage in the demulsification reaction chamber 3, coagulation reaction chamber 4 and flocculation reaction chamber 5 is appropriate. The wastewater after being treated by the solid-liquid separation chamber 6 is discharged through the drain outlet of the wastewater treatment tank 1.

[0036] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0037] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A process for treating spray painting wastewater, comprising: Wastewater treatment tank; The feature is that it also includes multiple reagent tanks, and the wastewater treatment tank is provided with a demulsification reaction chamber, a coagulation reaction chamber, a flocculation reaction chamber and a solid-liquid separation chamber. The reagent tanks are connected to a transmission pipe on the outside, and the multiple transmission pipes are respectively connected to the demulsification reaction chamber, the coagulation reaction chamber and the flocculation reaction chamber. A mixing mechanism is located outside the wastewater treatment tank. The mixing mechanism applies different stirring speeds to the demulsification reaction chamber, the coagulation reaction chamber, and the flocculation reaction chamber. The testing mechanism is located inside the wastewater treatment tank. The mixing mechanism mixes the wastewater and reagents in the demulsification reaction chamber, coagulation reaction chamber and flocculation reaction chamber. The testing mechanism then detects the water quality fluctuations flowing through the wastewater in real time. A feedback adjustment mechanism is located at the end of the transmission tube. Based on the detection results of the detection mechanism, the feedback adjustment mechanism adjusts the amount of reagent added in the demulsification reaction chamber, the coagulation reaction chamber, and the flocculation reaction chamber.

2. The spray painting wastewater treatment process according to claim 1, characterized in that: The mixing mechanism includes stirring rods located in the demulsification reaction chamber, coagulation reaction chamber, and flocculation reaction chamber, respectively. The stirring rods are rotatably connected to the inner wall of the wastewater treatment tank. A transmission gear is fixedly connected to the end of the stirring rod. The module of the transmission gear corresponding to the demulsification reaction chamber, coagulation reaction chamber, and flocculation reaction chamber increases sequentially. The surface of the wastewater treatment tank is provided with a drive component that simultaneously drives multiple transmission gears to rotate.

3. The spray painting wastewater treatment process according to claim 2, characterized in that: The driving component includes multiple transmission gears II, which have the same module. Each of the multiple transmission gears II meshes with a multiple transmission gear I. The transmission gears II are rotatably connected to the wastewater treatment tank. A drive gear is coaxially fixedly connected to the outer side of each transmission gear II. A toothed belt meshes with the outer side of each of the multiple drive gears. A rotary motor is fixedly connected to the outer side of one of the drive gears.

4. The spraying wastewater treatment process according to claim 1, characterized in that: The detection mechanism includes an inlet pipe connected to the demulsification reaction chamber, a centrifugal pump installed on the surface of the wastewater treatment tank, the inlet pipe connected to the centrifugal pump, a three-way solenoid valve connected to the end of the inlet pipe away from the centrifugal pump, a drain pipe connected to the outside of the three-way solenoid valve and a drain pipe connected to the outside of the drain pipe, the drain pipe connected to the demulsification reaction chamber, the drain pipe connected to the coagulation reaction chamber, a colorimetric detector for detecting the color of the wastewater inside the inlet pipe is provided on the outside of the inlet pipe, and a flocculant detector for detecting the degree of polymerization of the scum in the wastewater is provided inside the solid-liquid separation chamber.

5. The spray painting wastewater treatment process according to claim 4, characterized in that: The colorimetric detection device includes a colorimetric sensor installed on the outside of the water inlet pipe. The colorimetric sensor is fixed to the wastewater treatment tank. A controller is installed on the outside of the colorimetric sensor and is connected to a three-way solenoid valve.

6. The spray painting wastewater treatment process according to claim 5, characterized in that: The solid-liquid separation chamber includes a waste liquid collection chamber and a scum collection chamber. The floc detection device includes a base fixedly connected to the inner wall of the scum collection chamber. A rotating rod is rotatably connected to the inner wall of the base. A sieve plate is fixedly connected to the outer side of the rotating rod, and the sieve plate blocks the opening of the base. A spiral spring is fixedly connected to the outer side of the rotating rod. The end of the spiral spring away from the rotating rod is fixed to the inner wall of the base. A contact is fixedly connected to the end of the rotating rod. A trigger button is installed on the inner wall of the base. The trigger button is connected to a controller. The controller collects the trigger frequency of the trigger button. The inner wall of the solid-liquid separation chamber is provided with a scraper to scrape the scum on the top of the waste liquid collection chamber into the scum collection chamber.

7. The spray painting wastewater treatment process according to claim 6, characterized in that: The scraping component includes a scraper that is slidably connected to the inner wall of the waste liquid collection chamber. A connecting frame is fixedly connected to the top of the scraper. A transmission screw is threadedly connected inside the connecting frame. The transmission screw is rotatably connected to the inner wall of the wastewater treatment tank. A drive motor is fixedly connected to the end of the transmission screw. The drive motor is mounted on the surface of the wastewater treatment tank.

8. The spray painting wastewater treatment process according to claim 6, characterized in that: The feedback adjustment mechanism includes an adjustment box connected to the transmission pipe. A sealing plate is rotatably connected to the inner wall of the adjustment box. A rotating shaft is fixedly connected to the inner wall of the sealing plate. The rotating shaft is rotatably connected to the inner wall of the adjustment box. A transmission gear three is fixedly connected to the end of the rotating shaft. A toothed plate is fixedly connected to the outer side of the transmission gear three. A moving part that drives the toothed plate to move is provided on the inner wall of the adjustment box. A return spring is fixedly connected to the outer side of the toothed plate. The return spring is fixed to the inner wall of the adjustment box.

9. The spray painting wastewater treatment process according to claim 8, characterized in that: The moving part includes a connecting rod fixedly connected to the toothed plate. A sealing chamber is provided on the inner wall of the adjusting box. A piston plate is slidably connected to the inner wall of the sealing chamber. The piston plate is fixed to the connecting rod. An air inlet is provided on the top of the sealing chamber. A three-way solenoid valve II is fixedly connected to the top of the adjusting box. The three-way solenoid valve II is connected to the controller. An air inlet pipe and an air outlet pipe are connected to the outside of the three-way solenoid valve II. An air pump is installed on the outside of the wastewater treatment tank. Multiple air inlet pipes are respectively connected to the air pump. The controller controls the air passage status of different three-way solenoid valves II.

10. The spray painting wastewater treatment process according to claim 1, characterized in that: Includes the following steps: S1: The spraying wastewater after pH conditioning flows into the demulsification reaction chamber through the inlet in the wastewater treatment tank. The reagent tank adds a fixed amount of demulsifier to the demulsification reaction chamber through the transfer pipe. The mixing mechanism quickly stirs the demulsification reaction chamber. After the demulsifier is mixed with the wastewater, the spraying wastewater is demulsified. S2: The wastewater containing the mixed demulsifier is extracted and tested by the testing agency. After the demulsification is completed, the testing agency pumps the wastewater in the demulsification reaction chamber into the coagulation reaction chamber. If the demulsification is not complete, the extracted wastewater is discharged back into the demulsification reaction chamber. The dosage of the demulsifier is quantitatively increased through the feedback adjustment mechanism until the demulsification is complete. S3: After the demulsified wastewater enters the coagulation reaction chamber, the corresponding reagent tank adds a preset amount of coagulant to the coagulation reaction chamber through the transfer pipe. The mixing mechanism rotates at a medium speed in the coagulation reaction chamber. After the coagulant mixes with the wastewater, the destabilized fine particles in the spraying wastewater agglomerate into tiny flocs. S4: After coagulation treatment, the spraying wastewater enters the flocculation reaction chamber. The corresponding reagent tank adds a preset amount of flocculant to the flocculation reaction chamber through the transfer pipe. The mixing mechanism rotates at low speed in the flocculation reaction chamber. After the flocculant mixes with the wastewater, the tiny flocs in the spraying wastewater become large and dense flocs. S5: After the spraying wastewater in the flocculation reaction chamber flows into the solid-liquid separation chamber, the scum on the top of the solid-liquid separation chamber is scraped off by the detection mechanism. The detection mechanism tests the scraped scum. If the scum is small particles, it means that the particles cannot aggregate into flocs, and the feedback adjustment mechanism increases the amount of coagulant added quantitatively. If the scum is fine flocs, it means that the flocculation is insufficient, and the feedback adjustment mechanism increases the amount of flocculant added quantitatively. S6: When the scum is detected by the testing agency as a stable large floc, it indicates that the reagent dosage in the demulsification reaction chamber, coagulation reaction chamber and flocculation reaction chamber is appropriate, and the wastewater after solid-liquid separation is discharged through the drain outlet of the wastewater treatment tank.

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