Wastewater treatment device for pigment production and use method of wastewater treatment device
By designing an automatic leveling and stirring mechanism, the problem of low leveling efficiency of activated carbon particles was solved, achieving full contact between activated carbon particles and wastewater and efficient backwashing, thus improving the wastewater treatment effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-26
- Publication Date
- 2026-03-27
AI Technical Summary
In the existing technology, the small feed inlet of the activated carbon filter tank during pigment production results in low efficiency of activated carbon particle spreading, which affects the decolorization effect of wastewater.
A wastewater treatment device for pigment production was designed, comprising a placement mechanism, a leveling mechanism, and an auxiliary mechanism. The activated carbon granules are automatically leveled through hydraulic control and mechanical devices to increase the contact time between the granules and the wastewater, and are stirred during the backwashing process to increase the frequency of friction and collision between the granules.
This method achieves efficient spreading and backwashing of activated carbon particles, enhances wastewater decolorization, and improves the utilization efficiency of activated carbon particles and wastewater treatment efficiency.
Smart Images
Figure CN121735358A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the technical field of pigment wastewater decolorization, specifically relating to a wastewater treatment device for pigment production and its usage method. Background Technology
[0002] Pigments are raw materials that give a certain color. People often choose products based on their senses such as sight, touch, and smell. Pigments are an important part of the visual aspect. Therefore, whether pigments are used properly plays a decisive role in the quality of products. Due to the needs of life, pigments can be produced through chemical synthesis.
[0003] Currently, wastewater is generated during pigment production. This wastewater cannot be discharged directly. Activated carbon filters are used for decolorization in the wastewater treatment process. The porous structure of activated carbon adsorbs pigments and organic matter in the wastewater, achieving the purpose of decolorizing the pigment wastewater. In existing technology, when installing activated carbon particles inside the tank, manual spreading of the activated carbon particles inside the tank is required. The feed inlet of the activated carbon filter is small, and the operator cannot fully extend it during operation, resulting in low spreading efficiency of the activated carbon particles. Summary of the Invention
[0004] The purpose of this invention is to provide a wastewater treatment device for pigment production and its usage method, aiming to solve the problems mentioned in the background art.
[0005] To achieve the above objectives, the present invention provides the following technical solution: A wastewater treatment device for pigment production and its method of use include: a placement mechanism comprising a tank, a support frame at the bottom of the tank, an observation window, a conveying section, and a flow section on the side wall of the tank, a partition plate inside the tank, and filter caps on the partition plate that rise and open with hydraulic pressure; a leveling mechanism comprising a vertical rod on the partition plate, blades on the side wall of the vertical rod, a lifting section on the side wall of the vertical rod, a follower section on the lifting section, and a rotating section on the side wall of the vertical rod for leveling activated carbon particles; and an auxiliary mechanism comprising a placement trough and a groove on the side wall of the vertical rod, the placement trough and the groove communicating with each other, and a stirring section inside the groove.
[0006] As a preferred embodiment of the wastewater treatment device for pigment production of the present invention, the conveying section includes an inlet pipe and an outlet pipe disposed on the side wall of the tank body, with the inlet pipe located directly above the outlet pipe.
[0007] As a preferred embodiment of the wastewater treatment device for pigment production of the present invention, the flow section includes a first water pipe disposed on the side wall of the tank body, a pressure valve disposed on the side wall of the first water pipe, and a second water pipe disposed on the top of the tank body.
[0008] As a preferred embodiment of the wastewater treatment device for pigment production of the present invention, the lifting part includes a first thread and a lifting sleeve disposed on the side wall of the vertical rod. The lifting sleeve is located on the first thread, and a fixing rod is disposed on the side wall of the lifting sleeve. A first vertical groove is opened on the inner wall of the tank, and the end of the fixing rod away from the lifting sleeve is located inside the first vertical groove.
[0009] As a preferred embodiment of the wastewater treatment device for pigment production of the present invention, the follower part includes a fixed ring disposed at the bottom of the lifting sleeve. The fixed ring has an "L" shaped cross section. A filter plate is sleeved on the side wall of the vertical rod. An L-shaped annular groove is opened on the filter plate. The fixed ring is located inside the filter plate. The L-shaped annular groove provides space for the fixed ring to rise and fall.
[0010] As a preferred embodiment of the wastewater treatment device for pigment production of the present invention, the rotating part includes a second vertical groove disposed on the side wall of the vertical rod, a locking block disposed inside the vertical groove, the locking block being connected to the inner wall of the filter plate, and a scraper disposed at the bottom of the filter plate.
[0011] As a preferred embodiment of the wastewater treatment device for pigment production of the present invention, the stirring part includes a rotating shaft disposed inside the storage tank, a stirring rod disposed on the rotating shaft, a spring disposed inside the groove, and the end of the spring away from the groove being connected to the stirring rod.
[0012] As a preferred embodiment of the wastewater treatment method for pigment production of the present invention, the method includes the following steps: introducing pigment production wastewater into an equalization tank for pretreatment, adjusting the pH value to 6.0-8.5, removing suspended solids through a mechanical screen, and then allowing it to stand in a sedimentation tank for 30-120 minutes; inputting the pretreated wastewater into a tank from the top at a flow rate of 0.5-3.0 m³ / h, allowing the wastewater to fully contact the granular activated carbon inside the tank for decolorization; discharging the decolorized wastewater from the bottom of the tank; and injecting clean water into the tank from the bottom to backwash the activated carbon granules inside the tank, causing the activated carbon layer to expand and rub against the water, removing suspended solids, colloids, and loosely adsorbed impurities trapped on the surface, and restoring pore patency.
[0013] In a preferred embodiment of the wastewater treatment method for pigment production of the present invention, the pH value is adjusted using sodium hydroxide or sulfuric acid solution, and the granular activated carbon is coal-based columnar activated carbon or coconut shell activated carbon.
[0014] As a preferred embodiment of the wastewater treatment method for pigment production of the present invention, the backwashing procedure is started after the activated carbon filter tank has been running for 12-24 hours.
[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. By setting up a placement mechanism, a leveling mechanism, and an auxiliary mechanism, the activated carbon particles inside the tank can be leveled instead of manually. At the same time, during the process of activated carbon particles contacting wastewater, the particles can be prevented from floating, increasing the contact time between the activated carbon particles and the wastewater, thus making the contact between the activated carbon particles and the wastewater more thorough.
[0016] 2. When backwashing activated carbon granules, it can prevent the activated carbon granules from accumulating at the second water pipe and slowing down the water flow. At the same time, it can stir the activated carbon granules inside the tank, making the collision and friction between the activated carbon granules more frequent and accelerating the removal of impurities from the surface of the activated carbon granules. Attached Figure Description
[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein: Figure 1 This is a schematic diagram of the overall structure of a wastewater treatment device for pigment production. Figure 2 This is a schematic diagram of the interior of a tank in a wastewater treatment device for pigment production. Figure 3 This is a top view schematic diagram of the filter plate in a wastewater treatment device for pigment production; Figure 4 A bottom view of the filter plate in a wastewater treatment device for pigment production; Figure 5 This is a schematic cross-sectional view of the filter plate in a wastewater treatment device for pigment production.
[0018] Figure 6 This is a schematic diagram showing the connection between the lifting sleeve and the fixed ring in a wastewater treatment device for pigment production.
[0019] Figure 7 This is a schematic diagram of the groove and storage tank in a wastewater treatment device for pigment production.
[0020] In the diagram: 10. Tank body; 11. Support frame; 12. Observation window; 13. Conveying section; 131. Feed pipe; 132. Discharge pipe; 14. Flow section; 141. First water pipe; 142. Pressure valve; 143. Second water pipe; 15. Divider plate; 16. Filter cap; 20. Vertical rod; 21. Blade; 22. Lifting part; 221. First thread; 222. Lifting sleeve; 223. Fixed rod; 224. First vertical groove; 23. Follower part; 231. Fixed ring; 232. Filter plate; 233. L-shaped annular groove; 24. Rotating part; 241. Second vertical groove; 242. Locking block; 243. Scraper; 30. Storage trough; 31. Groove; 32. Stirring section; 321. Rotating shaft; 322. Stirring rod; 323. Spring. Detailed Implementation
[0021] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
[0022] Example 1 Reference Figure 1 - Figure 7 This is the first embodiment of the present invention, which provides a wastewater treatment device for pigment production. The device includes a placement mechanism, a leveling mechanism, and an auxiliary mechanism. Wastewater entering the tank 10 can level the activated carbon particles poured into the tank 10, and simultaneously press the activated carbon particles inside the tank 10. This allows for the expansion of the activated carbon particles, preventing them from scattering under the impact of the water flow and affecting their decolorization efficiency. When backwashing the activated carbon particles, the flowing liquid can release the pressure on the particles and simultaneously stir them, preventing them from accumulating on the top of the tank 10 and improving the backwashing effect.
[0023] Furthermore, the storage mechanism can pour a certain amount of activated carbon granules into the tank 10 for decolorizing the wastewater used in pigment production. It includes the tank 10, with a support frame 11 at the bottom of the tank 10. The side wall of the tank 10 is provided with an observation window 12, a conveying section 13, and a flow section 14. The observation window 12 allows for a more intuitive observation of the degree of activated carbon granule usage, facilitating timely adjustment of the backwashing frequency by the staff. The tank 10 is provided with a partition plate 15, and a filter cap 16 is provided on the partition plate 15 that opens as the hydraulic pressure rises.
[0024] When the partition plate 15 is filled with wastewater during use, under the action of water pressure, as the water pressure gradually increases, the filtered wastewater can be transported to the bottom of the partition plate 15 through the filter cap 16.
[0025] Furthermore, the material conveying section 13 includes an inlet pipe 131 and an outlet pipe 132 disposed on the side wall of the tank body 10, with the inlet pipe 131 located directly above the outlet pipe 132.
[0026] It should be noted that the partition plate 15 is located below the discharge pipe 132. Both the inlet pipe 131 and the discharge pipe 132 are equipped with sealing caps. When wastewater needs to be treated, the staff can open the sealing cap on the inlet pipe 131 and pour a certain amount of activated carbon granules into the tank 10 through the inlet pipe 131.
[0027] Furthermore, the flow section 14 includes a first water pipe 141 disposed on the side wall of the tank body 10. A pressure valve 142 is disposed on the side wall of the first water pipe 141. The real-time pressure inside the tank body 10 can be observed through the pressure valve 142. The value on the pressure valve 142 is used to determine whether the filter cap 16 is blocked. A second water pipe 143 is disposed on the top of the tank body 10.
[0028] During use, when decolorizing wastewater, the operator allows the wastewater to enter the tank 10 through the second water pipe 143. The wastewater gradually accumulates on the partition plate 15. When the wastewater fills the space above the partition plate 15, the wastewater comes into full contact with the activated carbon particles. As the water pressure increases, the activated carbon particles react and adsorb the wastewater. The treated wastewater then flows through the filter cap 16 into the space below the partition plate 15 and is finally discharged through the first water pipe 141.
[0029] Furthermore, the leveling mechanism can compress the activated carbon particles inside the tank 10 to prevent them from floating, thus ensuring more thorough contact between the wastewater and the activated carbon particles inside the tank 10. This includes a vertical rod 20 mounted on the partition plate 15, with its top extending into the interior of the second water pipe 143. The vertical rod 20 is located at the center of the top of the partition plate 15, and its bottom is rotatably connected to the partition plate 15. Multiple blades 21 are evenly distributed on the side wall of the vertical rod 20, located inside the second water pipe 143. A lifting part 22 with a follower part 23 is also provided on the side wall of the vertical rod 20. A rotating part 24 for leveling the activated carbon particles is also provided on the side wall of the vertical rod 20.
[0030] When in use, when wastewater passes through the second water pipe 143, the wastewater can drive the blade 21 to rotate, and the blade 21 drives the vertical rod 20 to rotate.
[0031] Furthermore, the lifting part 22 includes a first thread 221 and a lifting sleeve 222 disposed on the side wall of the vertical rod 20. The first thread 221 is located at the middle position on the side wall of the vertical rod 20, the lifting sleeve 222 is located on the first thread 221, and a fixing rod 223 is disposed on the side wall of the lifting sleeve 222. There are two fixing rods 223. The inner wall of the tank body 10 is provided with a first vertical groove 224. There are two first vertical grooves 224. The end of the fixing rod 223 away from the lifting sleeve 222 is located inside the first vertical groove 224.
[0032] When in use, when the vertical rod 20 rotates, the lifting sleeve 222 can be raised and lowered on the side wall of the vertical rod 20 through the arrangement of the first screw, the first vertical groove 224 and the fixed rod 223. The lifting sleeve 222 drives the fixed rod 223 to be raised and lowered inside the first vertical groove 224.
[0033] It should be noted that when the lifting sleeve 222 rises to the highest point of the first thread 221, the vertical rod 20 continues to rotate, and the lifting sleeve 222 can no longer rise.
[0034] Furthermore, the follower part 23 includes a fixing ring 231 disposed at the bottom of the lifting sleeve 222. The fixing ring 231 has an "L" shaped cross section. A filter plate 232 is sleeved on the side wall of the vertical rod 20. An L-shaped annular groove 233 is opened on the filter plate 232. The fixing ring 231 is located inside the filter plate 232. The L-shaped annular groove 233 provides space for the fixing ring 231 to rise and fall.
[0035] It should be noted that, in the initial state, under the action of gravity, the top surface inside the L-shaped annular groove 233 is in contact with the fixed ring 231. During use, when the lifting sleeve 222 descends, it can drive the fixed ring 231 to descend together. The fixed ring 231 can drive the filter plate 232 to descend together. When the filter plate 232 descends, it can squeeze the activated carbon particles inside the tank 10.
[0036] Furthermore, the rotating part 24 includes two second vertical grooves 241 disposed on the side wall of the vertical rod 20. The second vertical grooves 241 are interconnected with the first thread 221. A locking block 242 is disposed inside the vertical groove. The locking block 242 is connected to the inner wall of the filter plate 232. A scraper 243 is disposed at the bottom of the filter plate 232. There are multiple scrapers 243, which are evenly distributed at the bottom of the filter plate 232.
[0037] It should be noted that, through the setting of the second vertical groove 241 and the locking block 242, when the vertical rod 20 rotates, the vertical rod 20 can drive the locking block 242 to rotate, the locking block 242 can drive the filter plate 232 to rotate, and the filter plate 232 can drive the scraper 243 to rotate.
[0038] In use, when wastewater from the second water pipe 143 is input into the tank 10 from top to bottom, the wastewater drives the blades 21 to rotate, and the blades 21 drive the vertical rod 20 to rotate. This causes the lifting sleeve 222 to drive the fixing ring 231 to descend while simultaneously driving the filter plate 232 to descend and rotate. The filter plate 232 drives the scraper 243. When the filter plate 232 descends to the activated carbon particles, the scraper 243 can scrape the piled activated carbon particles inside the tank 10 to level them, so that the top of the activated carbon particles is level with the partition plate 15. When the filter plate 232 drives the locking block 242 to descend into the second vertical groove 241, the filter plate 232 completes the pressing of the activated carbon particles.
[0039] Furthermore, the auxiliary mechanism, when backwashing activated carbon particles, can prevent activated carbon particles from accumulating inside the tank 10, resulting in more friction and collision between activated carbon particles and improving the cleaning efficiency of activated carbon particles. This includes a storage trough 30 and a groove 31 set on the side wall of the vertical rod 20. The storage trough 30 and the groove 31 are interconnected, and a stirring part 32 is set inside the groove 31.
[0040] It should be noted that the storage slot 30 and the second vertical slot 241 are interconnected.
[0041] Furthermore, the stirring part 32 includes a rotating shaft 321 disposed inside the storage tank 30, a stirring rod 322 disposed on the rotating shaft 321, a spring 323 disposed inside the groove 31, and the end of the spring 323 away from the groove 31 is connected to the stirring rod 322.
[0042] It should be noted that, in the initial state, the stirring rod 322 is located at the tail of the storage tank 30 under the action of the spring 323.
[0043] During use, when the filter plate 232 descends, the stirring rod 322 can be squeezed on the filter plate 232, causing the stirring rod 322 to drive the spring 323 to contract until the stirring rod 322 is completely retracted into the storage tank 30. When the filter plate 232 rises, since the stirring rod 322 is no longer restricted by stirring, the spring 323 can restore and drive the stirring rod 322 to extend. At this time, when the vertical rod 20 rotates, the vertical rod 20 can drive the stirring rod 322 inside the storage tank 30 to rotate. The stirring rod 322 stirs the activated carbon particles inside the tank 10, making the rinsing of the activated carbon particles more thorough.
[0044] Working principle: When decolorizing wastewater generated during pigment production is required, the operator first opens the sealing cap on the feed pipe 131 and pours a certain amount of activated carbon granules into the tank 10 through the feed pipe 131. After reinstalling the sealing cap, the wastewater is pumped into the tank 10 through the second water pipe 143. The activated carbon granules react with the wastewater to achieve decolorization. During this process, when the wastewater inside the second water pipe 143 passes through the blade 21, the blade 21 drives the vertical rod 20 to rotate, causing the lifting sleeve 222 on the vertical rod 20 to descend. The lifting sleeve 222 drives the fixing ring 231 and the fixing rod 223 to descend together. The fixing ring 231 drives the filter plate 232 to descend and rotate simultaneously. The filter plate 232 drives the stirring rod 322 to retract into the storage tank 30. The filter plate 232 descends to the piled activated carbon particles. The filter plate 232 drives the scraper 243 to flatten the activated carbon particles. When the filter plate 232 descends to the bottom of the second vertical groove 241, the blades 21 cannot rotate under the action of wastewater. The filter plate 232 can press down the activated carbon particles to prevent them from floating and increase the contact time between the activated carbon and the wastewater. As the activated carbon particles come into contact with the wastewater, they may expand. Through the setting of the L-shaped annular groove 233 and the fixed ring 231, the expansion of the activated carbon particles can drive the filter plate 232 to move upward a certain distance. At the same time, as the space above the partition plate 15 is filled with wastewater, as the water pressure gradually increases, the wastewater that has reacted with the activated carbon particles enters the area below the partition plate 15 through the filter cap 16. Finally, the wastewater is discharged through the first water pipe 141.
[0045] After a period of use, in order to ensure the adsorption efficiency of activated carbon particles on wastewater, it is necessary to backwash the activated carbon particles inside the tank 10. The operator uses a gas pump to allow water to enter from the inside of the first water pipe 141. When the water fills the space at the bottom of the partition plate 15, as the water pressure increases, the water flows through the filter cap 16 and into the space above the partition plate 15, causing the water inside the tank 10 to be discharged from the second vertical pipe. During this process, the water flow drives the blades 21 to rotate in the opposite direction, which in turn drives the vertical rod 20 to rotate, causing the lifting sleeve 222 to rise and fall. When the lifting sleeve 222 rises, it can drive the fixing ring 231 to rise, which in turn drives the filter plate 232 to rise. The filter plate 232 then drives the scraper 243 to rise. Release the pressure on the stirring rod 322, and the spring 323 resumes its operation, causing the stirring rod 322 to extend out of the storage tank 30. As the water flows, it carries the activated carbon particles upward. When the lifting sleeve 222 rises to the highest point of the first thread 221, the lifting sleeve 222 can no longer rise when the vertical rod 20 continues to rotate. The vertical rod 20 can continue to drive the locking block 242 and the stirring rod 322 to rotate together. The locking block 242 drives the filter plate 232 to rotate, and the filter plate 232 drives the scraper 243 to stir the activated carbon particles at the bottom of the filter plate 232. The vertical rod 20 drives the stirring rod 322 to stir the activated carbon particles suspended in the water, which makes the impurities attached to the activated carbon particles fall off faster and improves the rinsing efficiency of the activated carbon particles by the water flow.
[0046] When it is necessary to replace the activated carbon particles inside the tank 10, the staff will open the sealing cover on the discharge pipe 132. Some of the activated carbon particles inside the tank 10 can be discharged directly through the discharge pipe 132, and the remaining activated carbon particles can be sucked out by the equipment. After all the activated carbon particles inside the tank 10 have been removed, the discharge pipe 132 can be sealed.
[0047] Example 2 This is a second embodiment of the present invention, which provides a method for treating wastewater from pigment production, comprising the following steps: introducing pigment production wastewater into an equalization tank for pretreatment, adjusting the pH value to 6.0-8.5, removing suspended solids through a mechanical screen, and then allowing it to settle in a sedimentation tank for 30-120 minutes; inputting the pretreated wastewater into a tank 10 from the top at a flow rate of 0.5-3.0 m³ / h, where the wastewater fully contacts the granular activated carbon to decolorize the wastewater; discharging the decolorized wastewater from the bottom of the tank 10; and inputting clean water into the tank 10 from the bottom to backwash the activated carbon granules inside the tank 10, causing the activated carbon layer to expand and rub against the water, stripping away suspended solids, colloids, and loosely adsorbed impurities trapped on the surface, and restoring pore patency.
[0048] Furthermore, the pH value is adjusted using sodium hydroxide or sulfuric acid solution, and the granular activated carbon is coal-based columnar activated carbon or coconut shell activated carbon.
[0049] Furthermore, after the activated carbon filter tank has been running for 12-24 hours, the backwashing procedure should be initiated.
[0050] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.
Claims
1. A wastewater treatment device for pigment production, characterized in that: include, The storage mechanism includes a tank (10), a support frame (11) is provided at the bottom of the tank (10), an observation window (12), a conveying part (13) and a flow part (14) are provided on the side wall of the tank (10), and a partition plate (15) is provided inside the tank (10), and a filter cap (16) is provided on the partition plate (15) that rises and opens with hydraulic pressure. The leveling mechanism includes a vertical rod (20) disposed on the partition plate (15), a blade (21) disposed on the side wall of the vertical rod (20), a lifting part (22) disposed on the side wall of the vertical rod (20), a follower part (23) disposed on the lifting part (22), and a rotating part (24) disposed on the side wall of the vertical rod (20) for leveling the activated carbon particles. The auxiliary mechanism includes a storage groove (30) and a recess (31) disposed on the side wall of the vertical rod (20), the storage groove (30) and the recess (31) are interconnected, and a stirring part (32) is disposed inside the recess (31).
2. The wastewater treatment device for pigment production according to claim 1, characterized in that: The material conveying section (13) includes an inlet pipe (131) and an outlet pipe (132) disposed on the side wall of the tank body (10), with the inlet pipe (131) located directly above the outlet pipe (132).
3. The wastewater treatment device for pigment production according to claim 2, characterized in that: The flow section (14) includes a first water pipe (141) disposed on the side wall of the tank (10), a pressure valve (142) disposed on the side wall of the first water pipe (141), and a second water pipe (143) disposed on the top of the tank (10).
4. The wastewater treatment device for pigment production according to claim 3, characterized in that: The lifting part (22) includes a first thread (221) and a lifting sleeve (222) disposed on the side wall of the vertical rod (20). The lifting sleeve (222) is located on the first thread (221). A fixing rod (223) is disposed on the side wall of the lifting sleeve (222). A first vertical groove (224) is opened on the inner wall of the tank (10). The end of the fixing rod (223) away from the lifting sleeve (222) is located inside the first vertical groove (224).
5. The wastewater treatment device for pigment production according to claim 4, characterized in that: The follower part (23) includes a fixing ring (231) disposed at the bottom of the lifting sleeve (222). The fixing ring (231) has an "L" shaped cross section. A filter plate (232) is sleeved on the side wall of the vertical rod (20). An L-shaped annular groove (233) is provided on the filter plate (232). The fixing ring (231) is located inside the filter plate (232). The L-shaped annular groove (233) provides space for the fixing ring (231) to rise and fall.
6. The wastewater treatment device for pigment production according to claim 5, characterized in that: The rotating part (24) includes a second vertical groove (241) disposed on the side wall of the vertical rod (20), and a locking block (242) is disposed inside the vertical groove. The locking block (242) is connected to the inner wall of the filter plate (232), and a scraper (243) is disposed at the bottom of the filter plate (232).
7. The wastewater treatment device for pigment production according to claim 6, characterized in that: The stirring part (32) includes a rotating shaft (321) disposed inside the storage groove (30), a stirring rod (322) disposed on the rotating shaft (321), a spring (323) disposed inside the groove (31), and the end of the spring (323) away from the groove (31) is connected to the stirring rod (322).
8. A method for treating wastewater from pigment production, wherein the wastewater treatment method uses the wastewater treatment apparatus as described in any one of claims 1-7, characterized in that, Includes the following steps: Pigment production wastewater is introduced into an equalization tank for pretreatment, where the pH value is adjusted to 6.0-8.
5. After suspended solids are removed by a mechanical screen, the wastewater is allowed to settle in a sedimentation tank for 30-120 minutes. The pretreated wastewater is fed into the tank (10) from the top at a flow rate of 0.5-3.0 m³ / h. The wastewater is in full contact with the granular activated carbon in the tank to decolorize the wastewater. The decolorized wastewater is discharged from the bottom of the tank (10); Water is injected into the interior of the tank (10) from the bottom to backwash the activated carbon particles inside the tank (10). The activated carbon layer expands and rubs through water rinsing, peeling off the suspended matter, colloids and loosely adsorbed impurities trapped on the surface, and restoring the pore openness.
9. A method for treating wastewater from pigment production according to claim 8, characterized in that: The pH value is adjusted using sodium hydroxide or sulfuric acid solution, and the granular activated carbon is coal-based columnar activated carbon or coconut shell activated carbon.
10. A method for treating wastewater from pigment production according to claim 9, characterized in that: After the activated carbon filter tank has been running for 12-24 hours, start the backwashing procedure.