Textile wastewater pretreatment equipment and method for reducing sludge yield

Abstract

The invention belongs to the technical field of textile wastewater treatment, and particularly relates to textile wastewater pretreatment equipment and method for reducing sludge yield, the textile wastewater pretreatment equipment comprises a wastewater treatment pond, the wastewater treatment pond is composed of a sedimentation pond, two filtering ponds and an air floatation pond, the surface of one side of the sedimentation pond is fixedly communicated with a sewage inlet pipe, and the two filtering ponds are arranged side by side; a through opening communicated with the sedimentation tank is formed in the surface of one side of each filter tank in a penetrating manner, a floating mechanism is arranged on the upper surface of the sedimentation tank, a gate opening mechanism is arranged on the inner side wall of each through opening, and a fishing mechanism is arranged in each filter tank. According to the textile wastewater pretreatment equipment and method capable of reducing the sludge yield, through movement and lifting of the hollowed-out bucket in the sedimentation tank and cooperation of the overturning air cylinder, automatic collection and discharge of large floating objects are achieved, the tedious and sanitary problems caused by manual cleaning are avoided, the large floating objects are effectively removed, and the sludge yield is reduced. The burden of a subsequent treatment unit is reduced, and the output of sludge is reduced.

Description

Technical Field

[0001] This invention relates to the field of textile wastewater treatment technology, and in particular to a textile wastewater pretreatment device and method for reducing sludge production. Background Technology

[0002] Textile wastewater is characterized by high pollutant concentration, complex composition, and poor biodegradability due to the complex processes of desizing, scouring, dyeing, and printing. It is especially rich in fibers, dyes, sizing agents, and heavy metals.

[0003] Textile wastewater contains a large amount of recalcitrant organic matter and heavy metals, resulting in poor biodegradability. Traditional biological treatment methods are insufficient to achieve ideal treatment effects. Existing textile wastewater treatment technologies mainly remove suspended solids and colloidal substances by adding flocculants to form precipitates. Although sedimentation is a routine step, traditional methods lack precise control over sedimentation time and effective separation and cleaning mechanisms for large floating objects generated in the early stages of sedimentation and small suspended solids that may clog subsequent equipment. Furthermore, some existing pretreatment equipment requires considerable manual operation to clean floating objects in sedimentation tanks, unclog filters, and clean grids. Moreover, multiple treatment units are relatively independent, which increases sludge production and reduces relative work efficiency. Therefore, the present invention addresses the shortcomings of the above-mentioned technologies. Summary of the Invention

[0004] Based on the aforementioned technical problems, this invention proposes a textile wastewater pretreatment device and method to reduce sludge production.

[0005] This invention proposes a textile wastewater pretreatment device to reduce sludge production, comprising a wastewater treatment tank, which consists of a sedimentation tank, a filtration tank, and an air flotation tank. The air flotation tank contains multiple dissolved air tanks, and a turbulence fan is installed on its inner wall. A hydraulic gate is installed between the filtration tank and the air flotation tank. An inlet pipe is fixedly connected to one side of the sedimentation tank. Two filtration tanks are arranged side-by-side, and an opening is formed on one side of each filtration tank to communicate with the sedimentation tank. A flotation mechanism is installed on the upper surface of the sedimentation tank, and a gate opening mechanism is installed on the inner wall of the opening. A retrieval mechanism is installed inside the filtration tank.

[0006] The gate opening mechanism controls the opening and closing of the passage, allowing the sedimentation tank to settle textile wastewater within a certain time period and blocking large floating objects in the sedimentation tank.

[0007] The flotation mechanism is used to collect large floating objects that have been filtered out by sedimentation in the sedimentation tank.

[0008] The retrieval mechanism retrieves and collects the impurities and confined objects precipitated from the filter pool.

[0009] Preferably, the gate opening mechanism includes symmetrically distributed sliding rods fixedly connected to the inner wall of the opening, a gate plate is slidably engaged with the inner wall of the sliding groove of the sliding rod, and a lifting cylinder is fixedly connected to the upper surface of the sedimentation tank, the piston rod of the lifting cylinder extending above the opening and onto the upper surface of the gate plate.

[0010] The above technical solution addresses the diverse sources of textile wastewater, including various processes such as desizing, scouring, bleaching, mercerizing, dyeing, printing, and finishing. The pollutants are complex, containing organic matter, suspended solids, and heavy metals. To treat textile wastewater and separate these impurities for recycling and reuse, the wastewater is introduced into a sedimentation tank through an inlet pipe. A gate is lowered by a lifting cylinder to seal the inlet, allowing the wastewater to accumulate in the sedimentation tank under the monitoring of a water level sensor. This initial sedimentation and separation of impurities further facilitates the process.

[0011] Preferably, the gate opening mechanism further includes a filter screen fixedly connected to one side surface of the slide bar by fixing nails. The filter screen is made of stainless steel, and a cleaning brush plate is provided on the side of the filter screen near the gate plate.

[0012] The above technical solution requires further treatment of the settled textile wastewater. To prevent the separated impurities from flowing into the next process with the wastewater, the lifting cylinder lifts the gate plate upwards at a uniform speed. Large floating objects are then blocked by the filter screen. To prevent the filter holes on the surface of the filter screen from being blocked by floating objects, multiple cleaning brush plates are moved horizontally when the gate is opened or closed, which can scrape the filter screen and cause the impurities to fall off.

[0013] Preferably, the gate opening mechanism further includes a guide slide rod fixedly connected to one side surface of the slide rod, the cleaning brush plate is slidably sleeved on the outer surface of the guide slide rod, and the gate plate has inclined track grooves symmetrically distributed on the side surface near the filter screen. The inner wall of the track groove is slidably engaged with a linkage shaft, and the free end of the linkage shaft is fixedly connected to one side surface of the cleaning brush plate.

[0014] With the above technical solution, in order to achieve the scraping action by driving the cleaning brush plate to move horizontally when the gate is opened and closed, the gate plate can drive the linkage shaft to move along the track groove when it moves up and down, thereby causing the cleaning brush plate to move symmetrically to both sides or to converge towards the middle, so that the brush on the cleaning brush plate scrapes the surface of the filter screen.

[0015] Preferably, the scooping mechanism includes a support beam disposed on the upper surface of the sedimentation tank, a movable sliding sleeve slidably sleeved on the outer surface of the slide rail of the support beam, a connecting beam fixedly connected to the upper surfaces of the two movable sliding sleeves, and a hollow bucket disposed between the two movable sliding sleeves.

[0016] In order to clean up large floating objects separated in the sedimentation tank, the hollow bucket is placed vertically on the bottom wall of the sedimentation tank. The water level in the sedimentation tank does not exceed the height of the hollow bucket. When the moving sleeve moves on the outer surface of the support beam slide rail, it drives the hollow bucket to move, so that the impurities precipitated in the sedimentation tank can be gradually scooped into the hollow bucket. Then, as the hollow bucket is raised, the impurities can be scooped out.

[0017] Preferably, the scooping mechanism further includes a mounting plate fixedly connected to one side surface of the movable sliding sleeve, a telescopic cylinder fixedly connected to the upper surface of the mounting plate, a connecting frame fixedly connected to the lower surface of the piston rod of the telescopic cylinder, the outer surface of the hollow bucket being rotatably connected to one side surface of the connecting frame, limit tubes being fixedly connected in a symmetrical manner to the upper surface of the mounting plate, and limit sliding rods being fixedly connected to the upper surface of the connecting frame, with the outer surface of the limit sliding rods slidingly sleeved with the inner surface of the limit tubes.

[0018] With the above technical solution, in order to adjust the height of the hollow bucket to retrieve floating objects, the height of the connecting frame is adjusted by a telescopic cylinder, and the limiting slide rod slides and extends on the inner surface of the limiting tube, thereby causing the connecting frame to drive the hollow bucket to adjust its height. At the same time, the connecting frame and the hollow bucket are rotatably connected, so the hollow bucket can be tilted and adjusted, allowing the hollow bucket to dump the floating objects.

[0019] Preferably, the floating mechanism further includes a tilting cylinder fixedly connected to the surface of the connecting frame away from the hollow bucket, an L-shaped drive rod fixedly connected to one side surface of the hollow bucket, the piston rod surface of the tilting cylinder being hinged to the upper surface of the drive rod, a floating matter collection tank being provided on one side of the sedimentation tank, and a conveying slide pipe fixedly connected to the upper surface of one end of the sedimentation tank.

[0020] Through the above technical solution, in order to tilt and adjust the hollow bucket to dump impurities, the piston rod of the tilting cylinder pushes or pulls the drive rod, thereby tilting and adjusting the hollow bucket. The tilted hollow bucket dumps the impurities into the conveying slide pipe, and they are collected in the floating matter collection pool along the conveying slide pipe.

[0021] Preferably, both sides of the support beam are rotatably connected to adjusting screws via bearing seats. A synchronizing sleeve is threaded onto the outer surface of the adjusting screw. One side surface of the synchronizing sleeve is fixedly connected to one side surface of the movable sliding sleeve. A support block is fixedly connected to one side surface of the support beam. A drive motor is mounted on the surface of the support block. A drive gear set is fixedly connected to the outer surface of the output shaft of the drive motor. The driven gear of the drive gear set is fixedly sleeved on the outer surface of one of the adjusting screws. A linkage housing is provided on the outer surfaces of both adjusting screws.

[0022] With the above technical solution, in order to drive the adjusting screw to rotate and thus enable the connecting frame to move the hollow bucket, the drive motor on the support block controls the rotation of the adjusting screw through the drive gear set. At the same time, a synchronous belt assembly is set in the linkage housing, so that the two adjusting screws can rotate synchronously. Then, with the connection of the connecting beam, the connecting frame can be controlled to move the hollow bucket horizontally in a stable manner.

[0023] Preferably, the retrieval mechanism includes a chain-type rotary bar screen installed in the filter pool. A screw conveyor is provided below the output end of the chain-type rotary bar screen, and a collection trough is provided below the output end of the screw conveyor. A spiral brush is rotatably connected to the top surface of the inner shell of the chain-type rotary bar screen. The drive device of the chain-type rotary bar screen drives the spiral brush to rotate through a linkage component. A distribution pipe is fixedly connected to the outer surface of the shell of the chain-type rotary bar screen through a support base. Multiple air nozzles are fixedly connected to the outer surface of the distribution pipe. The distribution pipe is fixedly connected to the inside of the branch pipe of the dissolved gas tank through a connecting air pipe.

[0024] The above technical solution aims to remove small floating objects and fibers, protect subsequent equipment such as water pumps, pipelines, dissolved air tanks, valves, aerators, and surface aerators from blockage or damage, and ensure the normal operation of the entire treatment system. A chain rotary bar screen is used to intercept and remove residual suspended solids, floating objects, and sediments from the water flow. The chain rotary bar screen is installed in the channel through which the water flows, i.e., the filter tank. The water flows horizontally towards the plane of motion of the rake teeth. The drive unit rotates the drive sprocket, which in turn drives two closed-loop chains to move synchronously. The rake teeth mounted on the chains rotate with the chains. When the rake teeth reach the bottom of the equipment, they insert into the gaps between the bar screens, intercepting and capturing solid debris in the water flow. The rake teeth carrying the debris move upwards with the chains. When the rake teeth reach the top of the equipment... When the drive wheel is in position, the chain changes direction. At this time, the rake teeth themselves flip over to unload the waste. After unloading, the rake teeth move downward with the chain and return to the bottom of the equipment to start the next cycle of cleaning. In order to remove the debris from the rake teeth, the drive device of the chain rotary bar screen drives the spiral brush to rotate through the gear meshing linkage, thereby cleaning the surface of the rake teeth. At the same time, the dissolved air tank dissolves air into water under high pressure, generating a large number of microbubbles. The high pressure input into the dissolved air tank is diverted to the distribution pipe, and then sprayed onto the surface of the rake teeth through the air nozzle, thereby assisting the spiral brush to remove impurities to the screw conveyor for conveying to the collection tank. This effectively removes floating matter and fibers from textile wastewater, reducing sludge production and treatment costs in the subsequent filtration and reuse process of textile wastewater.

[0025] The present invention proposes a method for treating textile wastewater using a pretreatment device that reduces sludge production, comprising the following steps: S1. Textile wastewater enters the sedimentation tank through the inlet pipe. At this time, the gate is lowered by the lifting cylinder, which can seal the opening, allowing the textile wastewater to accumulate in the sedimentation tank under the monitoring of the set water level sensor.

[0026] S2. Large floating objects such as scum are intercepted in the sedimentation tank. At this time, the hollow bucket is placed vertically on the bottom wall of the sedimentation tank. The water level in the sedimentation tank does not exceed the height of the hollow bucket. After the textile wastewater has settled for a certain period of time, the drive motor on the support block controls the rotation of the adjusting screw through the drive gear set. At the same time, the synchronous belt assembly is set in the linkage housing, so that the synchronous rotation of the two adjusting screws can be realized.

[0027] S3. When the adjusting screw rotates, the synchronous sleeve moves horizontally, which drives the moving sleeve to move on the outer surface of the support beam slide rail. In turn, under the connection of the connecting beam, the connecting frame can be controlled to drive the hollow bucket to move horizontally in a stable manner.

[0028] S4. After the hollow bucket moves from one end of the sedimentation tank to the other, the connecting frame is lifted by the telescopic cylinder, and the limiting slide rod slides and extends on the inner surface of the limiting tube, thereby causing the connecting frame to lift the hollow bucket upward. In order to tilt and adjust the hollow bucket to dump the impurities, the piston rod of the tilting cylinder is pulled to pull the drive rod, thereby realizing the tilting and adjustment of the hollow bucket. The tilted hollow bucket dumps the impurities into the conveying slide pipe, and they are collected in the floating matter collection tank along the conveying slide pipe.

[0029] S5. The settled textile wastewater needs further treatment. To prevent the separated impurities from flowing into the next process with the wastewater, the lifting cylinder lifts the gate plate upwards at a uniform speed. The large floating objects are blocked by the filter screen. The large floating objects are then further processed by the hollow bucket. When the gate plate opens or closes, it drives the linkage shaft to move along the track groove, which in turn drives the cleaning brush plate to move symmetrically to both sides or to the center. This allows the brushes on the cleaning brush plate to scrape the surface of the filter screen, peeling off the attached floating objects and preventing the filter holes on the filter screen from being blocked by the floating objects.

[0030] S6. After sedimentation, the wastewater flows into two parallel filter tanks through the inlet, and then flows to the surface of the rake teeth of the chain rotary bar screen. The chain rotary bar screen intercepts and removes the residual suspended solids, floating objects, and sediments in the water flow. When the rake teeth of the chain rotary bar screen unload the garbage due to their own rotating structure, the spiral brush is driven by the chain rotary bar screen to rotate and scrape off the fibers adhering to the rake teeth. The dissolved air tank diverts high-pressure dissolved air water to the distribution pipe, and the impurities are removed by air jets. Then the impurities are transported to the collection tank by the screw conveyor.

[0031] S7. After the filtered wastewater is opened through the hydraulic gate, it enters the dissolved air flotation tank. Microbubbles are generated through multiple dissolved air tanks to further remove colloids and fine suspended solids. The turbulence fan enhances the contact efficiency between the bubbles and pollutants. The scum generated in the dissolved air flotation tank can be removed by the subsequent sludge removal machine, and the sludge is discharged through the sludge discharge system.

[0032] The beneficial effects of this invention are as follows: 1. By setting up a flotation mechanism, large floating objects filtered out in the sedimentation tank can be scooped out and collected. During the adjustment process, the movement and lifting of the hollow bucket in the sedimentation tank, as well as the cooperation of the tilting cylinder, realize the automatic collection and discharge of large floating objects, avoiding the tediousness and hygiene problems of manual cleaning. By effectively removing large floating objects, the burden on subsequent treatment units is reduced and the amount of sludge generated is reduced.

[0033] 2. By setting up a gate opening mechanism to control the opening and closing of the inlet, the sedimentation tank can settle textile wastewater within a certain period of time, blocking large floating objects inside the sedimentation tank. During the adjustment process, the residence time of textile wastewater in the sedimentation tank can be precisely controlled through the gate control, ensuring that impurities are fully settled. When the gate opens and closes, the filter screen blocks residual large floating objects, preventing them from entering the subsequent treatment unit and ensuring the stable operation of the subsequent treatment unit. The cleaning brush plate can automatically clean impurities on the filter screen during the opening and closing of the gate, ensuring the filter screen is unobstructed and avoiding clogging problems.

[0034] 3. By setting up a retrieval mechanism, impurities and limiters precipitated from the filter tank can be retrieved and transported for collection. During the adjustment process, the chain rotary bar screen can effectively intercept and remove suspended solids, floating objects, and sediments in the water flow, including fine fibers and particles, protecting the normal operation of subsequent equipment. Through the cooperation of spiral brushes and air nozzles, impurities on the rake teeth can be effectively removed, ensuring the cleanliness and efficiency of the rake teeth. Thus, this invention achieves automated pretreatment of textile wastewater through the cooperation of the retrieval mechanism, the gate opening mechanism, and the retrieval mechanism, effectively reducing sludge production and improving wastewater treatment efficiency and economic benefits. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of a textile wastewater pretreatment device and method for reducing sludge production, as proposed in this invention. Figure 2 This is a three-dimensional view of the inlet structure of a textile wastewater pretreatment device and method for reducing sludge production proposed in this invention. Figure 3 This is a three-dimensional view of the lifting cylinder structure of a textile wastewater pretreatment device and method for reducing sludge production proposed in this invention. Figure 4 This is a three-dimensional view of the filter screen structure of a textile wastewater pretreatment device and method for reducing sludge production proposed in this invention. Figure 5 This is a three-dimensional view of the trajectory trough structure of a textile wastewater pretreatment device and method for reducing sludge production proposed in this invention. Figure 6 This is a perspective view of the conveying slide structure of a textile wastewater pretreatment device and method for reducing sludge production proposed in this invention. Figure 7 This is a three-dimensional view of the hollow bucket structure of a textile wastewater pretreatment device and method for reducing sludge production proposed in this invention. Figure 8 This is a perspective view of the regulating screw structure of a textile wastewater pretreatment device and method for reducing sludge production proposed in this invention. Figure 9This is a three-dimensional view of a chain rotary bar screen structure for a textile wastewater pretreatment device and method for reducing sludge production, as proposed in this invention. Figure 10 This is a three-dimensional view of the spiral brush structure of a textile wastewater pretreatment device and method for reducing sludge production proposed in this invention.

[0036] In the diagram: 1. Sedimentation tank; 11. Inlet pipe; 2. Filter tank; 21. Outlet; 3. Air flotation tank; 31. Dissolved air tank; 32. Turbulence fan; 33. Hydraulic gate; 4. Gate opening mechanism; 41. Sliding rod; 42. Gate plate; 43. Lifting cylinder; 44. Filter screen; 45. Cleaning brush plate; 46. Guide slide rod; 47. Track groove; 48. Linkage shaft; 5. Float retrieval mechanism; 51. Support beam; 52. Moving sleeve; 53. Connecting beam; 54. Hollow bucket; 55. Mounting plate 56. Telescopic cylinder; 57. Connecting frame; 58. Limiting tube; 59. Limiting slide bar; 60. Tilting cylinder; 61. Drive rod; 62. Floating object collection pool; 63. Conveying slide pipe; 64. Adjusting screw; 65. Synchronous sleeve; 66. Support block; 67. Drive motor; 68. Drive gear set; 69. Linkage housing; 7. Salvage mechanism; 71. Chain rotary bar screen; 72. Screw conveyor; 73. Collection trough; 74. Spiral brush; 75. Distribution pipe; 76. Air nozzle. Detailed Implementation

[0037] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0038] Reference Figures 1-10 A textile wastewater pretreatment device for reducing sludge production includes a wastewater treatment tank, which consists of a sedimentation tank 1, a filtration tank 2, and an air flotation tank 3. The air flotation tank 3 is equipped with multiple dissolved air tanks 31, and a turbulence fan 32 is installed on the inner wall of the air flotation tank 3. A hydraulic gate 33 is installed between the filtration tank 2 and the air flotation tank 3. An inlet pipe 11 is fixedly connected to one side surface of the sedimentation tank 1. Two filtration tanks 2 are arranged side by side, and an opening 21 is opened through one side surface of the two filtration tanks to communicate with the sedimentation tank 1. A flotation mechanism 5 is installed on the upper surface of the sedimentation tank 1, and a gate opening mechanism 4 is installed on the inner side wall of the opening 21. A retrieval mechanism 7 is installed inside the filtration tank 2.

[0039] The gate opening mechanism 4 controls the opening and closing of the opening 21, so that the sedimentation tank 1 settles the textile wastewater within a certain period of time and blocks large floating objects in the sedimentation tank 1.

[0040] Textile wastewater comes from a wide range of sources, including various processes such as desizing, scouring, bleaching, mercerizing, dyeing, printing, and finishing. The pollutants are complex, containing organic matter, suspended solids, and heavy metals. To treat textile wastewater and separate the organic matter, suspended solids, heavy metals, and other impurities, enabling its recycling and reuse, the gate opening mechanism 4 includes symmetrically distributed sliding rods 41 fixedly connected to the inner wall of the opening 21. A gate plate 42 is slidably engaged with the inner wall of the sliding groove of the sliding rod 41. A lifting cylinder 43 is fixedly connected to the upper surface of the sedimentation tank 1. The piston rod of the lifting cylinder 43 extends above the opening 21 and onto the upper surface of the gate plate 42, allowing textile wastewater to flow into the sedimentation tank 1 through the inlet pipe 11. At this time, the gate plate 42 is lowered by the lifting cylinder 43, sealing the opening 21. Under the monitoring of a water level sensor, the textile wastewater accumulates in the sedimentation tank 1, causing impurities to initially settle and separate within the sedimentation tank 1.

[0041] The settled textile wastewater needs further treatment. To prevent impurities from being discharged into the next process along with the flow of wastewater, the gate opening mechanism 4 also includes a filter screen 44 fixedly connected to one side of the slide bar 41 by fixing nails. The filter screen 44 is made of stainless steel. After the lifting cylinder 43 lifts the gate plate 42 upward at a uniform speed, large floating objects are blocked by the filter screen 44. In order to prevent the filter holes on the surface of the filter screen 44 from being blocked by floating objects, a cleaning brush plate 45 is provided on the side of the filter screen 44 near the gate plate 42. When the gate is opened or closed, multiple cleaning brush plates 45 are moved horizontally, which can scrape the filter screen 44 and make the impurities fall off.

[0042] To enable the cleaning brush plate 45 to move horizontally and perform the scraping action during the opening and closing of the gate, the gate opening mechanism 4 also includes a guide slide rod 46 fixedly connected to one side surface of the slide rod 41. The cleaning brush plate 45 is slidably sleeved on the outer surface of the guide slide rod 46. The side surface of the gate plate 42 near the filter screen 44 is symmetrically provided with inclined track grooves 47. The inner wall of the track groove 47 is slidably engaged with a linkage shaft 48. The free end of the linkage shaft 48 is fixedly connected to one side surface of the cleaning brush plate 45. When the gate plate 42 moves up and down, it can drive the linkage shaft 48 to move along the track groove 47, thereby causing the cleaning brush plate 45 to move symmetrically to both sides or to the center, so that the brush on the cleaning brush plate 45 scrapes the surface of the filter screen 44.

[0043] By setting the gate opening mechanism 4, the opening and closing of the outlet 21 is controlled, so that the sedimentation tank 1 can settle the textile wastewater within a certain period of time and block large floating objects in the sedimentation tank 1. During the adjustment process, the residence time of textile wastewater in the sedimentation tank 1 can be precisely controlled by the gate plate 42 to ensure that impurities are fully settled. When the gate plate 42 is opened and closed, the filter screen 44 blocks the remaining large floating objects and prevents them from entering the subsequent treatment unit, thus ensuring the stable operation of the subsequent treatment unit. The cleaning brush plate 45 can automatically clean the impurities on the filter screen 44 during the opening and closing of the gate, ensuring the unobstructed flow of the filter screen 44 and avoiding clogging problems.

[0044] Among them, the flotation mechanism 5 scoops out and collects large floating objects filtered out by sedimentation in the sedimentation tank 1.

[0045] To clean up large floating debris separated in the sedimentation tank 1, the flotation mechanism 5 includes a support beam 51 set on the upper surface of the sedimentation tank 1. A movable sliding sleeve 52 is slidably sleeved on the outer surface of the slide rail of the support beam 51. A connecting beam 53 is fixedly connected to the upper surface of the two movable sliding sleeves 52. A hollow shovel 54 is set between the two movable sliding sleeves 52. The hollow shovel 54 is placed vertically on the bottom wall of the sedimentation tank 1. The water level of the sedimentation tank 1 does not exceed the height of the hollow shovel 54. When the movable sliding sleeve 52 moves on the outer surface of the slide rail of the support beam 51, it drives the hollow shovel 54 to move, so that the impurities precipitated in the sedimentation tank 1 can be gradually shoveled into the hollow shovel 54. Then, as the hollow shovel 54 is raised, the impurities can be scooped out.

[0046] To adjust the height of the hollow bucket 54 for retrieving floating objects, the retrieval mechanism 5 also includes a mounting plate 55 fixedly connected to one side surface of the movable sliding sleeve 52. A telescopic cylinder 56 is fixedly connected to the upper surface of the mounting plate 55, and a connecting frame 57 is fixedly connected to the lower surface of the piston rod of the telescopic cylinder 56. The outer surface of the hollow bucket 54 is rotatably connected to one side surface of the connecting frame 57. Limiting tubes 58 are symmetrically distributed and fixedly connected to the upper surface of the mounting plate 55. Limiting slide rods 59 are fixedly connected to the upper surface of the connecting frame 57. The outer surface of the limiting slide rod 59 is slidably sleeved with the inner surface of the limiting tube 58. The height of the connecting frame 57 is adjusted by the telescopic cylinder 56, and the limiting slide rod 59 slides and extends and retracts on the inner surface of the limiting tube 58, thereby causing the connecting frame 57 to drive the hollow bucket 54 to adjust its height. At the same time, the connecting frame 57 and the hollow bucket 54 are rotatably connected, so the hollow bucket 54 can be tilted and adjusted, allowing the hollow bucket 54 to dump floating objects.

[0047] In order to tilt and adjust the hollow bucket 54 to dump impurities, the floating mechanism 5 also includes a tilting cylinder 60 fixedly connected to the surface of the connecting frame 57 away from the hollow bucket 54. An L-shaped drive rod 61 is fixedly connected to one side surface of the hollow bucket 54. The piston rod surface of the tilting cylinder 60 is hinged to the upper surface of the drive rod 61. A floating matter collection tank 62 is provided on one side of the sedimentation tank 1. A conveying slide pipe 63 is fixedly connected to the upper surface of one end of the sedimentation tank 1. The piston rod of the tilting cylinder 60 pushes or pulls the drive rod 61, thereby tilting and adjusting the hollow bucket 54. The tilted hollow bucket 54 dumps impurities into the conveying slide pipe 63 and collects them in the floating matter collection tank 62 along the conveying slide pipe 63.

[0048] To drive the adjusting screw 64 to rotate and thus enable the connecting frame 57 to move the hollow bucket 54, adjusting screws 64 are rotatably connected to both sides of the support beam 51 via bearing seats. A synchronous sleeve 65 is threaded onto the outer surface of the adjusting screw 64. One side of the synchronous sleeve 65 is fixedly connected to one side of the moving sliding sleeve 52. A support block 66 is fixedly connected to one side of the support beam 51. A drive motor 67 is mounted on the surface of the support block 66. A drive gear set 68 is fixedly connected to the outer surface of the output shaft of the drive motor 67. The driven gear of the drive gear set 68 is fixedly sleeved onto the outer surface of one of the adjusting screws 64. A linkage housing 69 is provided on the outer surfaces of the two adjusting screws 64. The drive motor 67 on the support block 66 controls the rotation of the adjusting screws 64 through the drive gear set 68. Simultaneously, a synchronous belt assembly is provided inside the linkage housing 69, thereby enabling the synchronous rotation of the two adjusting screws 64. This, in turn, allows the connecting frame 57 to move the hollow bucket 54 horizontally stably under the connection of the connecting beam 53.

[0049] By setting up the flotation mechanism 5, large floating objects filtered out by sedimentation in the sedimentation tank 1 can be scooped out and collected. During the adjustment process, the movement and lifting of the hollow bucket 54 in the sedimentation tank 1, along with the cooperation of the tilting cylinder 60, realizes the automatic collection and discharge of large floating objects, avoiding the tediousness and hygiene problems of manual cleaning. By effectively removing large floating objects, the burden on subsequent treatment units is reduced, and the amount of sludge generated is reduced.

[0050] Among them, the retrieval mechanism 7 retrieves and transports the impurities and limiters precipitated from the filter pool 2.

[0051] To remove small floating objects and fibers, protect subsequent equipment such as water pumps, pipes, dissolved air tank 31, valves, aerators, and surface aerators from blockage or damage, and ensure the normal operation of the entire treatment system, the removal mechanism 7 includes a chain rotary bar screen 71 installed in the filter tank 2. A screw conveyor 72 is installed below the output end of the chain rotary bar screen 71, and a collection tank 73 is installed below the output end of the screw conveyor 72. The chain rotary bar screen 71 intercepts and removes residual suspended solids, floating objects, and sediments in the water flow. The chain rotary bar screen 71 is installed in the channel through which the water flows, i.e., the filter... In pool 2, the water flows horizontally towards the plane of the rake teeth. The drive unit drives the active sprocket to rotate, which in turn drives two closed-loop chains to move synchronously. The rake teeth installed on the chains rotate with the chains. When the rake teeth reach the bottom of the equipment, they insert into the gaps between the grid bars. Solid debris in the water flow is intercepted and captured by the rake teeth. The rake teeth carrying the debris move upward with the chain. When the rake teeth reach the drive wheel at the top of the equipment, the chain changes direction. At this time, the rake teeth unload the garbage under the flipping action of their own structure. After unloading, the rake teeth move downward with the chain and return to the bottom of the equipment to start the next cycle of cleaning process.

[0052] To remove debris from the rake teeth, a spiral brush 74 is rotatably connected to the top surface of the inner shell of the chain rotary bar screen 71. The drive unit of the chain rotary bar screen 71 drives the spiral brush 74 to rotate through a linkage component. A distribution pipe 75 is fixedly connected to the outer surface of the shell of the chain rotary bar screen 71 through a support base. Multiple air nozzles 76 are fixedly connected to the outer surface of the distribution pipe 75. The distribution pipe 75 is fixedly connected to the inside of the branch pipe of the dissolved air tank 31 through a connecting air pipe. The drive unit of the chain rotary bar screen 71 is linked by gear meshing. The component drives the spiral brush 74 to rotate, thereby cleaning the surface of the rake teeth. At the same time, the dissolved air tank 31 dissolves air in water under high pressure, generating a large number of microbubbles. The high pressure input into the dissolved air tank 31 is diverted to the distribution pipe 75, and then sprayed onto the surface of the rake teeth through the air nozzle 76, thereby assisting the spiral brush 74 to peel off impurities and transport them to the screw conveyor 72 for transport to the collection tank 73. This effectively removes floating matter, fibers and other substances from textile wastewater, reducing sludge production and treatment costs in the subsequent filtration and reuse process of textile wastewater.

[0053] By setting up the retrieval mechanism 7, impurities and limiters precipitated from the filter tank 2 can be retrieved and transported for collection. During the adjustment process, the chain rotary bar screen 71 can effectively intercept and remove suspended solids, floating objects, and sediments in the water flow, including fine fibers and particles, protecting the normal operation of subsequent equipment. Through the cooperation of the spiral brush 74 and the air nozzle 76, impurities on the rake teeth can be effectively removed, ensuring the cleanliness and efficiency of the rake teeth. Thus, through the cooperation of the retrieval mechanism 5, the gate opening mechanism 4, and the retrieval mechanism 7, this invention realizes the automated pretreatment of textile wastewater, effectively reducing sludge production and improving wastewater treatment efficiency and economic benefits.

[0054] Reference Figures 1-10 A method for treating textile wastewater using a pretreatment device to reduce sludge production includes the following steps: S1. Textile wastewater enters sedimentation tank 1 through inlet pipe 11. At this time, the gate 42 is lowered by lifting cylinder 43, which can seal the opening 21, so that the textile wastewater can accumulate in sedimentation tank 1 under the monitoring of the set water level sensor.

[0055] S2. Large floating objects such as scum are intercepted in the sedimentation tank 1. At this time, the hollow bucket 54 is placed vertically on the bottom wall of the sedimentation tank 1. The water level in the sedimentation tank 1 does not exceed the height of the hollow bucket 54. After the textile wastewater has settled for a certain period of time, the drive motor 67 on the support block 66 controls the rotation of the adjusting screw 64 through the drive gear set 68. At the same time, a synchronous belt assembly is set in the linkage housing 69, so that the synchronous rotation of the two adjusting screws 64 can be realized.

[0056] S3. When the adjusting screw 64 rotates, the synchronous sleeve 65 moves horizontally, which drives the moving sleeve to move on the outer surface of the slide rail of the support beam 51. In turn, under the connection of the connecting beam 53, the connecting frame 57 can be controlled to drive the hollow bucket 54 to move horizontally in a stable manner.

[0057] S4. After the hollow bucket 54 moves from one end of the sedimentation tank 1 to the other end, the connecting frame 57 is lifted by the telescopic cylinder 56, and the limiting slide rod 59 slides and extends on the inner surface of the limiting tube 58, so that the connecting frame 57 drives the hollow bucket 54 to be lifted upward. In order to tilt and adjust the hollow bucket 54 to dump the impurities, the piston rod of the tilting cylinder 60 pulls the drive rod 61, thereby realizing the tilting and adjustment of the hollow bucket 54. The tilted hollow bucket 54 dumps the impurities into the conveying slide pipe 63, and collects them in the floating matter collection tank 62 along the conveying slide pipe 63.

[0058] S5. The settled textile wastewater needs further treatment. To prevent the separated impurities from flowing into the next process with the wastewater, the lifting cylinder 43 lifts the gate 42 upward at a uniform speed. The large floating objects are blocked by the filter screen 44. The large floating objects are then further processed by the hollow bucket 54. When the gate 42 opens or closes, it drives the linkage shaft 48 to move along the track groove 47, which in turn drives the cleaning brush plate 45 to move symmetrically to both sides or to the center. This allows the brushes on the cleaning brush plate 45 to scrape the surface of the filter screen 44, peeling off the attached floating objects and preventing the filter holes on the surface of the filter screen 44 from being blocked by the floating objects.

[0059] S6. After sedimentation, the wastewater flows into two parallel filter tanks 2 through the inlet 21, and then flows to the surface of the rake teeth of the chain rotary bar screen 71. The chain rotary bar screen 71 intercepts and removes the residual suspended solids, floating solids and sediments in the water flow. When the rake teeth of the chain rotary bar screen 71 unload the garbage under the action of their own structure, the spiral brush 74 is driven by the chain rotary bar screen 71 to rotate and scrape off the fibers adhering to the rake teeth. The dissolved air tank 31 diverts high-pressure dissolved air water to the distribution pipe 75, and the impurities are assisted in stripping by the air jet nozzle 76. Then the impurities are transported to the collection tank 73 by the screw conveyor 72.

[0060] S7. After the filtered wastewater is opened through the hydraulic gate 33, it enters the flotation tank 3. Microbubbles are generated through multiple dissolved air tanks 31 to further remove colloids and fine suspended solids. The turbulence fan 32 enhances the contact efficiency between the bubbles and pollutants. The scum generated in the flotation tank 3 can be removed by the subsequent sludge removal machine, and the sludge is discharged through the sludge discharge system.

[0061] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A textile wastewater pretreatment device for reducing sludge production, comprising a wastewater treatment tank, wherein the wastewater treatment tank is composed of a sedimentation tank (1), a filtration tank (2), and an air flotation tank (3), wherein the air flotation tank (3) is provided with multiple dissolved air tanks (31), and a turbulence fan (32) is installed on the inner wall of the air flotation tank (3), characterized in that: A hydraulic gate (33) is provided between the filter tank (2) and the flotation tank (3). A sludge inlet pipe (11) is fixedly connected to one side surface of the sedimentation tank (1). The filter tanks (2) are arranged in two parallel rows, and a passage (21) communicating with the sedimentation tank (1) is opened through one side surface of the two filter tanks (2). A flotation mechanism (5) is provided on the upper surface of the sedimentation tank (1). A gate opening mechanism (4) is provided on the inner side wall of the passage (21). A retrieval mechanism (7) is provided inside the filter tank (2). The gate opening mechanism (4) controls the opening and closing of the opening (21), so that the sedimentation tank (1) settles the textile wastewater within a certain period of time and blocks large floating objects in the sedimentation tank (1). The flotation mechanism (5) collects and removes large floating objects that have been filtered out by sedimentation in the sedimentation tank (1). The retrieval mechanism (7) retrieves and transports the impurities and limiters precipitated from the filter pool (2).

2. The textile wastewater pretreatment equipment for reducing sludge production according to claim 1, characterized in that: The gate opening mechanism (4) includes slid rods (41) that are symmetrically distributed and fixedly connected to the inner wall of the opening (21). A gate plate (42) is slidably engaged with the inner wall of the slid groove of the slid rod (41). A lifting cylinder (43) is fixedly connected to the upper surface of the sedimentation tank (1). The piston rod of the lifting cylinder (43) extends above the opening (21) and onto the upper surface of the gate plate (42).

3. The textile wastewater pretreatment equipment for reducing sludge production according to claim 2, characterized in that: The gate opening mechanism (4) also includes a filter screen (44) fixedly connected to one side surface of the slide bar (41) by a fixing nail. The filter screen (44) is made of stainless steel and a cleaning brush plate (45) is provided on the side of the filter screen (44) near the gate plate (42).

4. The textile wastewater pretreatment equipment for reducing sludge production according to claim 3, characterized in that: The gate opening mechanism (4) also includes a guide slide rod (46) fixedly connected to one side surface of the slide rod (41). The cleaning brush plate (45) is slidably sleeved on the outer surface of the guide slide rod (46). The gate plate (42) has inclined track grooves (47) symmetrically distributed on the side surface near the filter screen (44). The inner wall of the track groove (47) is slidably engaged with a linkage shaft (48). The free end of the linkage shaft (48) is fixedly connected to one side surface of the cleaning brush plate (45).

5. The textile wastewater pretreatment equipment for reducing sludge production according to claim 4, characterized in that: The scooping mechanism (5) includes a support beam (51) set on the upper surface of the sedimentation tank (1), a movable sliding sleeve (52) is slidably sleeved on the outer surface of the slide rail of the support beam (51), a connecting beam (53) is fixedly connected to the upper surface of the two movable sliding sleeves (52), and a hollow bucket (54) is set between the two movable sliding sleeves (52).

6. The textile wastewater pretreatment equipment for reducing sludge production according to claim 5, characterized in that: The scooping mechanism (5) further includes a mounting plate (55) fixedly connected to one side surface of the movable sliding sleeve (52). A telescopic cylinder (56) is fixedly connected to the upper surface of the mounting plate (55). A connecting frame (57) is fixedly connected to the lower surface of the piston rod of the telescopic cylinder (56). The outer surface of the hollow bucket (54) is rotatably connected to one side surface of the connecting frame (57). Limiting tubes (58) are fixedly connected to the upper surface of the mounting plate (55) in a symmetrical arrangement. Limiting slide rods (59) are fixedly connected to the upper surface of the connecting frame (57). The outer surface of the limiting slide rods (59) is slidably sleeved with the inner surface of the limiting tubes (58).

7. The textile wastewater pretreatment equipment for reducing sludge production according to claim 6, characterized in that: The floating mechanism (5) also includes a tilting cylinder (60) fixedly connected to the side surface of the connecting frame (57) away from the hollow bucket (54). An L-shaped drive rod (61) is fixedly connected to one side surface of the hollow bucket (54). The piston rod surface of the tilting cylinder (60) is hinged to the upper surface of the drive rod (61). A floating object collection tank (62) is provided on one side of the sedimentation tank (1). A conveying slide pipe (63) is fixedly connected to the upper surface of one end of the sedimentation tank (1).

8. A textile wastewater pretreatment device for reducing sludge production according to claim 7, characterized in that: Both sides of the support beam (51) are rotatably connected to adjusting screws (64) via bearing seats. The outer surface of the adjusting screws (64) is threaded with a synchronous sleeve (65). One side surface of the synchronous sleeve (65) is fixedly connected to one side surface of the movable sliding sleeve (52). One side surface of the support beam (51) is fixedly connected to a support block (66). A drive motor (67) is mounted on the surface of the support block (66). The outer surface of the output shaft of the drive motor (67) is fixedly connected to a drive gear set (68). The driven gear of the drive gear set (68) is fixedly sleeved on the outer surface of one of the adjusting screws (64). The outer surfaces of the two adjusting screws (64) are provided with a linkage housing (69).

9. A textile wastewater pretreatment device for reducing sludge production according to claim 8, characterized in that: The salvage mechanism (7) includes a chain rotary bar screen (71) installed in the filter pool (2). A screw conveyor (72) is provided below the output end of the chain rotary bar screen (71). A collection trough (73) is provided below the output end of the screw conveyor (72). A spiral brush (74) is rotatably connected to the inner top surface of the shell of the chain rotary bar screen (71). The drive device of the chain rotary bar screen (71) drives the spiral brush (74) to rotate through a linkage component. A distribution pipe (75) is fixedly connected to the outer surface of the shell of the chain rotary bar screen (71) through a support seat. Multiple air nozzles (76) are fixedly connected to the outer surface of the distribution pipe (75). The distribution pipe (75) is fixedly connected to the inside of the branch pipe of the dissolved gas tank (31) through a connecting air pipe.

10. A treatment method for textile wastewater pretreatment equipment for reducing sludge production as described in claim 9, characterized in that: Includes the following steps, S1. Textile wastewater enters sedimentation tank (1) through inlet pipe (11). At this time, the gate (42) is lowered by lifting cylinder (43), and the gate (42) can seal the opening (21), so that the textile wastewater accumulates in sedimentation tank (1) under the monitoring of the set water level sensor. S2. Large floating objects such as scum are intercepted in the sedimentation tank (1). At this time, the hollow bucket (54) is placed vertically on the bottom wall of the sedimentation tank (1). The water level of the sedimentation tank (1) does not exceed the height of the hollow bucket (54). After the textile wastewater has settled for a certain period of time, the drive motor (67) on the support block (66) controls the rotation of the adjusting screw (64) through the drive gear set (68). At the same time, the synchronous belt assembly is set in the linkage housing (69), so that the synchronous rotation of the two adjusting screws (64) can be realized. S3. When the adjusting screw (64) rotates, the synchronous sleeve (65) moves horizontally, which drives the moving sleeve to move on the outer surface of the slide rail of the support beam (51). Then, under the connection of the connecting beam (53), the connecting frame (57) can be controlled to drive the hollow bucket (54) to move horizontally in a stable manner. S4. After the hollow bucket (54) moves from one end of the sedimentation tank (1) to the other end, the connecting frame (57) is lifted by the telescopic cylinder (56), and the limiting slide rod (59) slides and extends on the inner surface of the limiting tube (58), so that the connecting frame (57) drives the hollow bucket (54) to be lifted upward. In order to tilt the hollow bucket (54) to realize the dumping of impurities, the piston rod of the tilting cylinder (60) pulls the drive rod (61), thereby realizing the tilting adjustment of the hollow bucket (54). The tilted hollow bucket (54) dumps the impurities into the conveying slide pipe (63) and collects them in the floating matter collection tank (62) along the conveying slide pipe (63). S5. The textile wastewater after sedimentation needs further treatment. In order to prevent the impurities after separation from being discharged into the next process along with the flow of wastewater, the lifting cylinder (43) lifts the gate (42) upward at a uniform speed. The large floating objects are blocked by the filter screen (44). The large floating objects are then processed by the hollow bucket (54). When the gate (42) opens or closes, it drives the linkage shaft (48) to move along the track groove (47), which in turn drives the cleaning brush plate (45) to move symmetrically to both sides or to the center. This allows the brush on the cleaning brush plate (45) to scrape the surface of the filter screen (44) and peel off the attached floating objects, preventing the filter holes on the surface of the filter screen (44) from being blocked by the floating objects. S6. After sedimentation, the wastewater flows into two parallel filter tanks (2) through the inlet (21) and then flows to the surface of the rake teeth of the chain rotary bar screen (71). The chain rotary bar screen (71) intercepts and removes the suspended solids, floating solids and sediments remaining in the water flow. When the rake teeth of the chain rotary bar screen (71) unload the garbage under the action of the self-turning structure, the spiral brush (74) is driven by the chain rotary bar screen (71) to rotate and scrape off the fibers adhering to the rake teeth. The dissolved air tank (31) diverts the high-pressure dissolved air water to the distribution pipe (75). The impurities are then removed by the air jet nozzle (76) by spraying air bubbles. The impurities are then transported to the collection tank (73) by the screw conveyor (72). S7. After the filtered wastewater is opened through the hydraulic gate (33), it enters the flotation tank (3). Microbubbles are generated through multiple dissolved air tanks (31) to further remove colloids and fine suspended solids. The turbulence fan (32) enhances the contact efficiency between the bubbles and pollutants. The scum generated in the flotation tank (3) can be removed by the subsequent sludge removal machine, and the sludge is discharged through the sludge discharge system.

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