Sewage multi-stage treatment device suitable for textile technology

Abstract

The invention discloses a sewage multi-stage treatment device suitable for a textile process, relates to the technical field of sewage treatment of the textile process, and is used for solving the problems that a subsequent purification assembly is easy to block and shut down and the like due to the fact that fiber materials with relatively high content exist in textile sewage and are not subjected to interception pretreatment. According to the textile sewage treatment device, gridding interception pretreatment is conducted on textile sewage, suspended fibers with the blocking risk are subjected to interception winding treatment, the existing form of the suspended fibers in the sewage is changed, and therefore scraping is conducted more effectively, winding interception bars on transmission gear sleeves are driven to rotate through rotation of sleeves, fibers existing in the sewage are grabbed, and the effect of removing the fibers in the sewage is achieved. And the rotating shaft is rotated to drive the winding intercepting rods on the transmission gear sleeve to rotate through the sleeve teeth, so that the grabbed long-strip-shaped suspended fibers are rotationally wound, and the probability that the suspended fibers block a subsequent grid plate is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of textile process sewage treatment, and specifically to a multi-stage sewage treatment device suitable for textile processes. Background Art

[0002] Textile process sewage refers to various wastewaters generated during the textile production process, with complex compositions and high pollutant contents. If directly discharged without treatment, it will cause serious pollution to the environment.

[0003] Regarding the sewage treatment of textile processes, multiple factors such as sewage characteristics, treatment objectives, and site conditions need to be comprehensively considered, and a suitable treatment process combination should be selected according to the water quality characteristics of the sewage. For example, for printing and dyeing sewage containing a large amount of refractory organic matter, a process of "hydrolysis acidification + biological contact oxidation + advanced treatment" can be adopted. For sewage mainly composed of suspended solids and oils, the air flotation process can be used for pretreatment first. According to the patent text with the publication number CN118788038A, the blockage of the filter screen holes by fiber floating objects in textile sewage is intercepted and brushed on the inner wall of the filter cylinder during the rotation of the telescopic comb tooth plate. However, considering the activities of the sewage filter cylinder and the comb tooth plate, the wear of the comb tooth plate and the subsequent cleaning of the intercepted fiber floating objects all require shutdown and repair, and there are also lack of effective means for subsequent sewage treatment.

[0004] Therefore, we propose a multi-stage sewage treatment device suitable for textile processes. Summary of the Invention

[0005] The purpose of the present invention is to provide a multi-stage sewage treatment device suitable for textile processes to solve the problems raised in the above background art.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A multi-stage sewage treatment device suitable for textile processes, including a pretreatment tank and a physicochemical treatment tank. A physicochemical treatment tank is installed on one side of the pretreatment tank. A transmission box one is fixedly connected to the top of the pretreatment tank, and a winding mechanism is evenly and movably connected to the bottom of the transmission box one.

[0007] The winding mechanism includes a sleeve, a transmission gear sleeve, and a winding and intercepting rod. The bottom of the transmission box one is evenly and movably connected with sleeves. The inner wall of the sleeve is evenly and movably connected with a transmission gear sleeve. A winding and intercepting rod is slidably connected inside the transmission gear sleeve. A spring is sleeved and fixed on the sleeve and located on the winding and intercepting rod.

[0008] An air flotation chamber is opened in the physicochemical treatment tank, and an air supply pipeline is evenly laid and installed at the bottom of the air flotation chamber. A sand filtration chamber, an activated carbon filtration chamber, and a fiber filtration chamber are opened on the side of the air flotation chamber in the physicochemical treatment tank.

[0009] Further, a rotating shaft is movably connected inside the sleeve and located in the first transmission box. A sliding sleeve is slidably connected to the rotating shaft inside the sleeve. A conical block is fixedly connected to the outer wall of the sliding sleeve and located on the side of the winding interception rod. A sleeve gear is fixedly connected to the outer wall of the rotating shaft and on the channel of the outer wall of the sliding sleeve. The sleeve gear is meshed with the transmission gear sleeve.

[0010] Further, the outer wall of the rotating shaft is symmetrically movably connected with rotating arms. One end of each rotating arm is fixedly connected with a load ball, and the other end of each rotating arm is movably connected with the corresponding connecting rod at the bottom of the sliding sleeve.

[0011] Further, a grid plate is fixedly connected inside the pretreatment box. A scraping bar is slidably connected to the grid plate. A second transmission box is fixedly connected to the inner wall of the pretreatment box. Guide ropes are symmetrically installed at the bottom of the second transmission box and fixed to the scraping bar. A slag storage box is fixedly installed on the side of the pretreatment box. A guide plate is fixedly connected to the side of the grid plate, and the side of the guide plate is communicated with the slag storage box.

[0012] Further, a hose pump I is installed on the side of the physicochemical treatment box, and the water inlet end of the hose pump I is communicated with the pretreatment box, and the water outlet end of the hose pump I is communicated with the air flotation chamber.

[0013] Further, a medicine adding component is communicated and installed on the side of the physicochemical treatment box and located on the side of the air flotation chamber. A feeding box is fixedly connected to the other side of the physicochemical treatment box, and the two sides of the feeding box are respectively communicated with the air flotation chamber and the sand filtration chamber. Drainage ports are opened on the sides of the sand filtration chamber, the activated carbon filtration chamber and the fiber filtration chamber. A hose pump II is installed on the side of the physicochemical treatment box, and the water inlet end of the hose pump II is communicated with the fiber filtration chamber.

[0014] The multi-stage sewage treatment method for this textile process is as follows:

[0015] Winding and forming of suspended fibers. The first transmission component works to realize the self-rotation of multiple sleeves. The fiber interception rods installed on the sides of the sleeves during the rotation process are used to grab fibers in the sewage.

[0016] As the sleeve rotates, the first transmission box also drives the rotating shaft to rotate, and the rotating shaft rotates at a variable speed. When the rotating shaft rotates, it drives the bottom rotating arms to unfold, causing the sliding sleeve connected to the rotating arms to move upward, and uses the conical block to push the winding interception rod outward. The rotation of the rotating shaft causes the sleeve gear to move. The rotation of the sleeve gear drives the self-rotation of the winding interception rods on the sleeve to wind the grabbed and intercepted fibers. When the winding and the telescopic movement are carried out synchronously, some of the wound fibers break away from the winding interception rods and adhere to the surface of the grid plate. At the same time, the second transmission box winds the ropes, uses the scraping bar to clean the impurities intercepted on the surface of the grid plate, and finally enriches the impurities through the guide plate.

[0017] Physical and chemical multi-stage treatment, working with hose pump 1 and the chemical dosing assembly, the sewage and the coagulant are uniformly mixed in the air flotation chamber. At the same time, air enters the air inlet pipe, injecting tiny air bubbles into the sewage. Then, the floating scum is removed through the scum scraping device. The treated sewage enters the sand filtration chamber through the material transfer box, and then enters the activated carbon filtration chamber along the sand filtration chamber, and finally reaches the fiber filtration chamber. Through the interception of the filter medium, the fine suspended solids, organic matter, and some heavy metal ions in the sewage are further removed. Finally, the treated sewage is discharged through hose pump 2.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] 1. In the present invention, grid interception pretreatment of textile sewage is carried out, and the suspended fibers at risk of blockage are intercepted and wound. The existing form of the suspended fibers in the sewage is changed, so as to scrape more effectively. The rotation of the sleeve drives the winding interception rod on the transmission gear sleeve to rotate, grasping the fibers existing in the sewage. Then, the centrifugal force generated by the rotation of the rotating shaft drives the load ball at the end of the rotating arm to rotate, pushing the entire sliding sleeve. When the tapered block on the sliding sleeve moves, it pushes the entire winding interception rod to expand and contract. Moreover, rotating the rotating shaft also drives the winding interception rod on the transmission gear sleeve to rotate by means of the sleeve teeth, rotating and winding the long strip suspended fibers that are grasped. Along with the expansion and contraction of the winding interception rod, the looped suspended fibers are gradually pushed away, reaching the side of the grid plate, and being pulled and cleaned by the sliding scraping strip, realizing the efficient removal of fibers in the sewage.

[0020] 2. In the present invention, through the setting of multi-stage treatment of textile sewage, the pretreatment tank treats the fiber impurities in the sewage. The subsequent physical and chemical treatment tank conducts multi-region distribution treatment, using the coagulant for solid-liquid separation and removing solid impurities by means of air flotation. At the same time, the interception fillers installed in the sand filtration chamber, activated carbon filtration chamber, and fiber filtration chamber further remove the fine suspended solids, organic matter, and some heavy metal ions in the sewage, realizing the efficient removal of various pollutants and making the effluent quality reach a relatively high standard. Description of the Drawings

[0021] Figure 1 It is a schematic diagram of the overall structure of the sewage multi-stage treatment device applicable to the textile process of the present invention;

[0022] Figure 2 It is a schematic diagram of the structure of the physical and chemical treatment tank without the cover of the present invention;

[0023] Figure 3 It is a schematic diagram of the installation of the coiling mechanism at the bottom of the first transmission box of the present invention;

[0024] Figure 4 It is a schematic diagram of the overall structure of the coiling mechanism of the present invention;

[0025] Figure 5This is a schematic diagram of the installation of the material transfer box on the side of the physical and chemical treatment box of the present invention;

[0026] Figure 6 It is a right view schematic diagram of the structure of the multi-stage sewage treatment device applicable to the textile process of the present invention;

[0027] Figure 7 It is a left-side structural schematic diagram of the multi-stage sewage treatment device applicable to the textile process of the present invention.

[0028] In the figure: 1. pretreatment box; 2. physicochemical treatment box; 3. hose pump 1; 4. transmission box 1; 5. winding mechanism; 501. sleeve; 502. transmission gear sleeve; 503. winding interception rod; 504. spring; 6. rotating shaft; 7. sliding sleeve; 8. sleeve gear; 9. conical block; 10. rotating arm; 11. load ball; 12. grid plate; 13. scraper bar; 14. guide plate; 15. slag storage box; 16. transmission box 2; 17. dosing component; 18. flotation chamber; 19. sand filter chamber; 20. activated carbon filter chamber; 21. fiber filter chamber; 22. ventilation pipe; 23. material transfer box; 24. sewage outlet; 25. hose pump 2. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] See also Figure 1-7 , the present invention provides a technical solution:

[0031] Example 1: Figure 1 As shown, the combined multi-stage treatment of textile wastewater using the pretreatment box 1 and the physical and chemical treatment box 2 achieves wastewater purification, which is beneficial to the subsequent recycling of water resources. Considering that the fiber and fabric in textile wastewater are higher than those in traditional wastewater, and traditional filtering equipment has few fiber treatment methods, it is very easy to cause problems such as filter blockage and transmission mechanism winding down;

[0032] In order to pre-treat and intercept the fibers in the sewage, a transmission box 4 is installed on the top of the pre-treatment box 1, and at the same time, multiple sets of winding mechanisms 5 are evenly and flexibly connected at the bottom of the transmission box 4. Multiple sets of winding interception rods 503 installed on the outer wall of the sleeve 501 are used to grasp and wind the limited position when the sleeve 501 rotates. At the same time, a grid assembly is installed behind the winding mechanism 5. Compared with directly intercepting the grid plate 12, the strip-shaped line segments have different shapes on the mesh holes of the grid plate 12, which is not conducive to the subsequent cleaning of the entire scraper 13. Therefore, it is necessary to actively adjust the suspended fiber shape;

[0033] However, the grasping and processing effect by the simple winding interception rod 503 is low. For example, Figure 4 As shown, the rotating shaft 6 is installed within the entire sleeve 501. Meanwhile, a sliding sleeve 7 is sleeved and slidably connected to the outer wall of the rotating shaft 6. A plurality of tapered blocks 9 are installed on the sliding sleeve 7. The winding interception rod 503 installed on the transmission gear sleeve 502 abuts against the outer wall of the tapered block 9. A spring 504 is sleeved on the winding interception rod 503;

[0034] When the entire sliding sleeve 7 moves upward, the outer wall of the tapered block 9 is used to push the entire winding interception rod 503 outward. When the sliding sleeve 7 moves downward, the entire winding interception rod 503 contracts inward. By using the telescopic movement of the winding interception rod 503, the winding fibers are pushed;

[0035] In order to further fasten the fibers obtained by the winding interception rod 503, sleeve teeth 8 are evenly sleeved and fixed on the rotating shaft 6. The sleeve teeth 8 are correspondingly meshed and connected to the transmission gear sleeve 502. Along with the rotation of the sleeve 501, at this time, the rotating shaft 6 does not need to rotate. After the transmission gear sleeve 502 contacts the sleeve teeth 8, it automatically rotates, and actively rotates and winds the fibers obtained by the winding interception rod 503, winding the original filamentous fibers into a cylindrical shape;

[0036] When the winding interception rod 503 obtains enough winding fibers, at this time, the first transmission box 4 starts to drive the rotating shaft 6 to rotate. The entire sleeve 501 rotates, and the rotating shaft 6 inside it rotates simultaneously. For the rotating arm 10 installed at the bottom of the rotating shaft 6, since a load ball 11 is fixed at its end, the centrifugal force generated during rotation causes the entire load ball 11 to expand outward, and at the same time drives the entire rotating arm 10 to expand, pushing the sliding sleeve 7 upward;

[0037] Along with the upward movement of the tapered block 9, it pushes the entire winding interception rod 503 outward. At the same time, the motor speed in the first transmission box 4 is controlled. When the speed of the rotating shaft 6 changes, it causes the sliding sleeve 7 to move up and down, which also causes the telescopic movement of the winding interception rod 503. And the transmission gear sleeve 502 continuously pushes the winding fibers on the winding interception rod 503 away. The wound fiber blocks are more convenient to intercept compared to the filamentous fibers;

[0038] A grid plate 12 is also installed inside the pretreatment tank 1. A scraping bar 13 is slidably connected to the grid plate 12. Along with the continuous interception of the grid plate 12, a large amount of impurities and wound fibers adhere to its surface. At this time, the second transmission box 16 drives the connection line segment to wind up, pulling the scraping bar 13 to slide on the surface of the grid plate 12, uniformly pushing the impurities onto the guide plate 14. Along with the inclined design of the guide plate 14, the impurities enter the slag storage box 15 on one side along the guide plate 14 to be enriched. The sewage that has completed the preliminary purification is sent into the physical and chemical treatment tank 2 through the hose pump 1 for in-depth treatment;

[0039] By pre-treating textile wastewater, we can avoid clogging of subsequent filter components by fibers contained in the wastewater, and the overall cleaning process is time-consuming and labor-intensive.

[0040] Example 2: Figure 2 As shown, the entire physical and chemical treatment box 2 is divided into two parts, an air flotation chamber 18 for air flotation treatment and a comprehensive filter chamber for deep treatment, including a sand filter chamber 19, an activated carbon filter chamber 20 and a fiber filter chamber 21. Sand, activated carbon and composite fiber materials are filled in the chambers in turn to perform deep interception treatment on the sewage flowing through;

[0041] like Figure 1 As shown, a hose pump 3 is installed on the side of the physicochemical treatment box 2. The sewage entering the air flotation chamber 18 through the hose pump 3 begins to mix with the coagulant discharged from the dosing component 17. Due to the special inclined box structure of the entire physicochemical treatment box 2;

[0042] like Figure 6 As shown, fine suspended matter, colloidal substances and some dyes in the sewage undergo coagulation and flocculation reactions to form larger flocs, which settle to the bottom of the pool under the action of gravity, achieving solid-liquid separation and effectively reducing the chromaticity and suspended matter content of the sewage. For this reason, when the bottom ventilation pipe 22 is not working, sewage treatment can be achieved by simply adding chemicals for static sedimentation, but it is usually suitable for situations where the sewage content is small and the treatment is not tight;

[0043] When air is introduced into the ventilation pipe 22, the generated tiny bubbles make the suspended matter in the sewage, such as grease, fiber, etc., adhere to the bubbles, and then float to the water surface, and then the scum is removed by the scraping device installed in the physical and chemical treatment box 2. It is effective for textile sewage containing more grease and lighter suspended matter, and can effectively remove oil droplets and some suspended fiber impurities, thereby improving the water quality of the sewage.

[0044] The sewage after secondary purification enters the sand filter chamber 19 through the material transfer box 23, and then passes through the activated carbon filter chamber 20 and the fiber filter chamber 21 in sequence. Through the interception effect of the filter media in each chamber, the fine suspended matter, organic matter and some heavy metal ions in the sewage are further removed, thereby improving the clarity and stability of the effluent water quality.

[0045] like Figure 7 As shown, a hose pump 25 installed on the other side of the physicochemical treatment box 2 starts to extract the purified sewage. At the same time, a sewage outlet 24 is opened on the side of the sand filter chamber 19, the activated carbon filter chamber 20 and the fiber filter chamber 21. Compared with directly cleaning the filler, when the entire sewage multi-stage treatment device is not in use, the filter material can be intercepted and backwashed by passing water through the top, thereby extending the service life of the entire chamber filler.

[0046] Working principle of the present invention: The rotation of multiple sets of sleeves 501 is achieved through the operation of transmission component 1, and the fiber-catching rods 503 installed on the sides of the sleeves 501 are used to grab fibers in the sewage during the rotation process.

[0047] As the sleeves 501 rotate, the first transmission box 4 also drives the rotating shaft 6 to rotate, and the rotating shaft 6 rotates at a variable speed. When the rotating shaft 6 rotates, it drives the bottom swing arm 10 to unfold, causing the sliding sleeve 7 connected to the swing arm 10 to move upward, and the fiber-catching rods 503 are pushed outward by the tapered blocks 9. The rotation of the rotating shaft 6 enables the sleeve teeth 8 to move, and the rotation of the sleeve teeth 8 drives the fiber-catching rods 503 on the sleeves 501 to rotate self-rotationally, winding the grabbed and intercepted fibers. When the winding and telescopic movements are synchronized, some of the wound fibers break away from the fiber-catching rods 503 and adhere to the surface of the grid plate 12. At the same time, the second transmission box 16 winds the rope, and the scraping strip 13 is used to clean the intercepted impurities on the surface of the grid plate 12. Finally, the impurities are concentrated through the material guide plate 14.

[0048] As the first hose pump 3 and the dosing component 17 operate, the sewage and the coagulant are uniformly mixed in the air flotation chamber 18. At the same time, air enters the air supply pipe 22 to inject minute air bubbles into the sewage. Then, the floating scum is removed by the scum scraping device. The treated sewage enters the sand filtration chamber 19 through the material transfer box 23, and then flows along the sand filtration chamber 19 into the activated carbon filtration chamber 20, and finally reaches the fiber filtration chamber 21. Through the interception of the filter medium, the fine suspended solids, organic matter, and some heavy metal ions in the sewage are further removed. Finally, the treated sewage is discharged through the second hose pump 25.

[0049] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the present invention to the specific implementation manners. Obviously, many modifications and changes can be made according to the content of this specification. These embodiments are selected and specifically described in this specification to better explain the principle and practical application of the present invention, so that those skilled in the relevant technical field can understand and utilize the present invention well. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A multi-stage sewage treatment device applicable to textile processes, comprising a pretreatment tank (1) and a physicochemical treatment tank (2), characterized in that, One side of the pretreatment tank (1) is equipped with a physicochemical treatment tank (2). The top of the pretreatment tank (1) is fixedly connected with a first transmission box (4). The bottom of the first transmission box (4) is evenly and movably connected with a coiling mechanism (5). The coiling mechanism (5) includes a sleeve (501), a transmission gear sleeve (502) and a coiling and intercepting rod (503). The bottom of the first transmission box (4) is evenly and movably connected with sleeves (501). The inner wall of the sleeve (501) is evenly and movably connected with transmission gear sleeves (502). A coiling and intercepting rod (503) is slidably connected in the transmission gear sleeve (502). A spring (504) is sleeved and fixed on the coiling and intercepting rod in the sleeve (501). An air flotation chamber (18) is opened in the physicochemical treatment tank (2). Aeration pipes (22) are evenly laid and installed at the bottom of the air flotation chamber (18). A sand filtration chamber (19), an activated carbon filtration chamber (20) and a fiber filtration chamber (21) are opened on the side of the air flotation chamber (18) in the physicochemical treatment tank (2).

2. The multi-stage sewage treatment device applicable to the textile process according to claim 1, characterized in that, A rotating shaft (6) is movably connected in the sleeve (501) and in the first transmission box (4). A sliding sleeve (7) is slidably connected to the rotating shaft (6) in the sleeve (501). A conical block (9) is fixedly connected to the outer wall of the sliding sleeve (7) on the side of the coiling and intercepting rod (503). A sleeve gear (8) is fixedly connected to the outer wall of the rotating shaft (6) on the outer wall channel of the sliding sleeve (7). The sleeve gear (8) is meshed and connected with the transmission gear sleeve (502).

3. The sewage multi-stage treatment device applicable to the textile process according to claim 2, characterized in that, The outer wall of the rotating shaft (6) is symmetrically and movably connected with a rotating arm (10). One end of the rotating arm (10) is fixedly connected with a load ball (11). The other end of the rotating arm (10) is correspondingly and movably connected with the connecting rod at the bottom of the sliding sleeve (7).

4. The multi-stage sewage treatment device applicable to the textile process according to claim 3, characterized in that, A grid plate (12) is fixedly connected in the pretreatment tank (1). A scraping bar (13) is slidably connected to the grid plate (12). Guide ropes are symmetrically installed at the bottom of a second transmission box (16) fixedly connected to the inner wall of the pretreatment tank (1) and are fixed to the scraping bar (13). A slag storage box (15) is installed and fixed on the side of the pretreatment tank (1). A guide plate (14) is fixedly connected to the side of the grid plate (12), and the side of the guide plate (14) is communicated with the slag storage box (15).

5. The sewage multi-stage treatment device applicable to the textile process according to claim 4, wherein, A hose pump one (3) is installed on the side of the physicochemical treatment tank (2). The water inlet end of the hose pump one (3) is communicated with the pretreatment tank (1). The water outlet end of the hose pump one (3) is communicated with the air flotation chamber (18).

6. The multi-stage sewage treatment device applicable to the textile process according to claim 5, characterized in that, A medicine adding component (17) is communicated and installed on the side of the physicochemical treatment tank (2) and on the side of the air flotation chamber (18). A material transmission box (23) is fixedly connected to the other side of the physicochemical treatment tank (2). The two sides of the material transmission box (23) are respectively communicated with the air flotation chamber (18) and the sand filtration chamber (19). Drain ports (24) are opened on the sides of the sand filtration chamber (19), the activated carbon filtration chamber (20) and the fiber filtration chamber (21). A hose pump two (25) is installed on the side of the physicochemical treatment tank (2). The water inlet end of the hose pump two (25) is communicated with the fiber filtration chamber (21).

7. The multi-stage sewage treatment device applicable to the textile process according to claim 6, characterized in that, The multi-stage treatment method for textile process wastewater is as follows: For the winding and forming of suspended fibers, when the first transmission component works, multiple sets of sleeves (501) rotate on their own. During the rotation process, the winding and interception rods (503) installed on the sides of the sleeves (501) are used to grab fibers in the sewage. As the sleeves (501) rotate, the first transmission box (4) also drives the rotating shaft (6) to rotate, and the rotating shaft (6) rotates at a variable speed. When the rotating shaft (6) rotates, it drives the bottom swing arm (10) to unfold, causing the sliding sleeve (7) connected to the swing arm (10) to move upward, and using the conical block (9) to push the winding and interception rod (503) outwards. Through the rotation of the rotating shaft (6), the sleeve gear (8) moves, and the rotation of the sleeve gear (8) drives the winding and interception rod (503) on the sleeve (501) to rotate on its own, winding the grabbed and intercepted fibers. When the winding and telescopic movements are carried out simultaneously, some of the wound fibers break away from the winding and interception rod (503) and adhere to the surface of the grid plate (12). At the same time, the second transmission box (16) winds the rope, and uses the scraping strip (13) to clean the impurities intercepted on the surface of the grid plate (12). Finally, the impurities are enriched through the guide plate (14). For multi-stage physical and chemical treatment, when the first hose pump (3) and the chemical dosing component (17) work, the sewage and the coagulant are uniformly mixed in the air flotation chamber (18). At the same time, air enters through the air inlet pipe (22) and tiny bubbles are injected into the sewage. Then, the floating scum is removed by the scum scraping device. The treated sewage enters the sand filtration chamber (19) through the feeding box (23), and then enters the activated carbon filtration chamber (20) along the sand filtration chamber (19), and finally reaches the fiber filtration chamber (21). Through the interception of the filter medium, fine suspended solids, organic matter, and some heavy metal ions in the sewage are further removed. Finally, the treated sewage is discharged through the second hose pump (25).

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