Multi-stage sewage treatment device suitable for textile process

Abstract

The application discloses a multi-stage sewage treatment device suitable for a textile process, relates to the technical field of textile process sewage treatment, and is used for solving the problems of easy blockage of subsequent purification components and shutdown caused by the high content of fiber materials in textile sewage and the fact that the fiber materials are not subjected to interception pretreatment; the application performs grid interception pretreatment on the textile sewage, intercepts and winds the suspended fibers with the risk of blockage, changes the existing form of the suspended fibers in the sewage, thereby more effectively scraping, drives the winding interception rod on the transmission gear sleeve to rotate through the rotation of the sleeve, captures the fibers existing in the sewage, and drives the winding interception rod on the transmission gear sleeve to rotate through the sleeve gear and the rotation shaft, rotates and winds the captured long strip-shaped suspended fibers, and reduces the blockage probability of the subsequent grid plates by the suspended fibers.

Description

Technical Field

[0001] The invention relates to the technical field of textile process wastewater treatment, in particular to a multi-stage wastewater treatment device suitable for textile processes. Background Art

[0002] Textile process wastewater refers to various wastewaters generated during the textile production process. It has complex components and high pollutant content. If it is discharged directly without treatment, it will cause serious pollution to the environment.

[0003] Compared with the wastewater treatment of textile processes, it is necessary to comprehensively consider multiple factors such as wastewater characteristics, treatment objectives, site conditions, etc., and select an appropriate treatment process combination according to the water quality characteristics of the wastewater. For example, for printing and dyeing wastewater containing a large amount of difficult-to-degrade organic matter, the "hydrolysis acidification + biological contact oxidation + deep treatment" process can be adopted. For wastewater mainly composed of suspended matter and grease, a flotation process can be used for pretreatment. According to the patent publication number CN118788038A, the clogging of the filter mesh by fiber floating matter in textile wastewater is solved by setting a retractable comb plate to intercept and scrub the fiber floating matter on the inner wall of the filter cartridge during rotation. However, considering the movement of the sewage filter cartridge and the comb plate, the wear of the comb plate and the subsequent cleaning of the intercepted fiber floating matter, the machine needs to be shut down for maintenance, and there is a lack of effective means for subsequent sewage treatment.

[0004] To this end, we propose a multi-stage wastewater treatment device suitable for textile processes. Summary of the Invention

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

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: a multi-stage sewage treatment device suitable for textile processes, comprising a pretreatment tank and a physicochemical treatment tank, wherein the physicochemical treatment tank is installed on one side of the pretreatment tank, the top of the pretreatment tank is fixedly connected to a transmission box 1, and the bottom of the transmission box 1 is evenly and movably connected to a winding mechanism;

[0007] The coiling mechanism includes a sleeve, a transmission gear sleeve and a winding intercepting rod. The bottom of the transmission box is evenly and movably connected to the sleeve, the inner wall of the sleeve is evenly and movably connected to the transmission gear sleeve, the winding intercepting rod is slidably connected in the transmission gear sleeve, and a spring is fixed in the sleeve and on the winding intercepting rod.

[0008] An air flotation cavity is provided in the physicochemical treatment box, and ventilation pipes are evenly laid and installed at the bottom of the air flotation cavity. A sand filter cavity, an activated carbon filter cavity and a fiber filter cavity are provided in the physicochemical treatment box and on the side of the air flotation cavity.

[0009] Furthermore, a rotating shaft is movably connected in the sleeve and located in the transmission box, the rotating shaft is slidably connected to a sliding sleeve in the sleeve, the outer wall of the sliding sleeve is fixedly connected to a conical block on the side of the winding intercepting rod, the outer wall of the rotating shaft is fixedly connected to a sleeve tooth on the outer wall channel of the sliding sleeve, and the sleeve tooth is meshed with the transmission gear sleeve.

[0010] Furthermore, a rotating arm is symmetrically and movably connected to the outer wall of the rotating shaft, one end of the rotating arm is fixedly connected to a load ball, and the other end of the rotating arm is correspondingly and movably connected to the bottom connecting rod of the sliding sleeve.

[0011] Furthermore, a grid plate is fixedly connected inside the pretreatment box, a scraper strip is slidably connected to the grid plate, a transmission box 2 is fixedly connected to the inner wall of the pretreatment box, a guide rope is symmetrically installed at the bottom of the transmission box 2 and fixed to the scraper strip, a slag storage box is fixedly installed on the side of the pretreatment box, a material guide plate is fixedly connected to the side of the grid plate, and the material guide plate side is communicated with the slag storage box.

[0012] Furthermore, a hose pump 1 is installed on the side of the physicochemical treatment box, and the water inlet end of the hose pump 1 is connected to the pretreatment box, and the water outlet end of the hose pump 1 is connected to the flotation chamber.

[0013] Furthermore, a dosing component is installed on the physicochemical treatment box and is located on the side connected to the flotation chamber. A material transfer box is fixedly connected to the other side of the physicochemical treatment box, and the two sides of the material transfer box are respectively connected to the flotation chamber and the sand filter chamber. Sewage outlets are provided on the sides of the sand filter chamber, activated carbon filter chamber and fiber filter chamber. A hose pump 2 is installed on the side of the physicochemical treatment box, and the water inlet end of the hose pump 2 is connected to the fiber filter chamber.

[0014] The multi-stage wastewater treatment method for this textile process is:

[0015] The suspended fibers are wound and formed. The transmission assembly works to realize the self-rotation of multiple sleeves. The winding intercepting rods installed on the side of the sleeves are used to grab the fibers in the sewage during the rotation.

[0016] As the sleeve rotates, the transmission box 1 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 arm to expand, causing the sliding sleeve connected to the rotating arm to move upward, and uses the conical block to push the winding intercepting rod outward. The movement of the sleeve teeth is realized by the rotation of the rotating shaft. The rotation of the sleeve teeth drives the winding intercepting rod on the sleeve to rotate, and the intercepted fiber is wound. When the winding and the telescopic movement are carried out synchronously, part of the rolled fiber is detached from the winding intercepting rod and attached to the surface of the grid. At the same time, the transmission box 2 reels the rope, and uses the scraper to clean the impurities intercepted on the grid surface, and finally the impurities are enriched through the guide plate.

[0017] Physicochemical multi-stage treatment, accompanied by the operation of hose pump 1 and dosing components, the sewage and coagulant are mixed in the flotation chamber. At the same time, air is introduced into the ventilation pipe to inject tiny bubbles into the sewage, and then the scum is removed by the scraping device. The treated sewage enters the sand filter chamber through the material transfer box, and then enters the activated carbon filter chamber along the sand filter chamber, and finally comes to the fiber filter chamber. Through the interception effect of the filter medium, the fine suspended matter, organic matter and some heavy metal ions in the sewage are further removed, and finally the treated sewage is discharged through hose pump 2.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. In the present invention, a grid-type interception pretreatment of textile wastewater is carried out, and suspended fibers with a risk of clogging are intercepted and wound, thereby changing the form of suspended fibers in the wastewater, thereby scraping them more effectively. The rotation of the sleeve drives the winding interception rod on the transmission gear sleeve to rotate, and the fibers in the wastewater are grabbed. 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 sliding sleeve as a whole, and when the conical block on the sliding sleeve moves, the entire winding interception rod is pushed to extend and retract. The rotating shaft also drives the winding interception rod on the transmission gear sleeve to rotate through the sleeve teeth, and the grabbed long suspended fibers are rotated and wound. As the winding interception rod retracts and retracts, the looped suspended fibers are gradually pushed away to the side of the grating, and are pulled and cleaned by the sliding scraper bar, thereby achieving efficient removal of fibers in the wastewater.

[0020] 2. In the present invention, multi-stage treatment of textile wastewater is set up, the pretreatment tank is used to treat fiber impurities in the wastewater, and the subsequent physicochemical treatment tank is used to carry out multi-region distribution treatment. Coagulants are used for solid-liquid separation and solid impurities are removed by flotation. At the same time, intercepting fillers subsequently installed in the sand filter chamber, activated carbon filter chamber and fiber filter chamber further remove fine suspended matter, organic matter and some heavy metal ions in the wastewater, thereby achieving efficient removal of multiple pollutants and making the effluent water quality meet higher standards. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0022] Figure 2 This is a schematic diagram of the structure of the physicochemical treatment box without the cover of the present invention;

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

[0024] Figure 4 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 physicochemical treatment box of the present invention;

[0026] Figure 6 This is a right side structural schematic diagram of a multi-stage sewage treatment device applicable to textile technology according to the present invention;

[0027] Figure 7 This is a left-side structural schematic diagram of the multi-stage sewage treatment device suitable for textile technology according to the present invention.

[0028] In the figure: 1. Pretreatment box; 2. Physical and chemical treatment box; 3. Hose pump 1; 4. Transmission box 1; 5. Coil mechanism; 501. Sleeve; 502. Transmission gear sleeve; 503. Winding interceptor 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 assembly; 18. Flotation chamber; 19. Sand filter chamber; 20. Activated carbon filter chamber; 21. Fiber filter chamber; 22. Ventilation pipe; 23. Transfer box; 24. Sewage outlet; 25. Hose pump 2. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts 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, a combined multi-stage treatment of textile wastewater using a pretreatment tank 1 and a physicochemical treatment tank 2 is used to purify the wastewater, which is beneficial to the subsequent recycling of water resources. Considering that the fiber and fabric content in textile wastewater is higher than that in traditional wastewater, and traditional filtering equipment has few fiber treatment methods, it is very easy to cause problems such as filter screen clogging 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. At the same time, multiple sets of winding mechanisms 5 are evenly and flexibly connected to 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 fibers 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 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, active adjustment of the suspended fiber shape is required;

[0033] However, the effect of simply winding the interceptor rod 503 to grab the processing is low, such as Figure 4 As shown, the rotating shaft 6 is installed in the entire sleeve 501, and the outer wall of the rotating shaft 6 is slidably connected with a sliding sleeve 7, and multiple groups of tapered blocks 9 are installed on the sliding sleeve 7. The winding intercepting rod 503 installed on the transmission gear sleeve 502 abuts against the outer wall of the tapered block 9, and a spring 504 is sleeved on the winding intercepting rod 503;

[0034] When the entire sliding sleeve 7 moves upward, the outer wall of the conical block 9 pushes the entire winding intercepting rod 503 outward, and when the sliding sleeve 7 moves downward, the entire winding intercepting rod 503 contracts inward, and the winding intercepting rod 503 is pushed by the telescopic movement.

[0035] In order to further tighten the fibers captured by the winding interceptor rod 503, sleeve teeth 8 are evenly sleeved and fixed on the rotating shaft 6. The sleeve teeth 8 are correspondingly meshed and connected with the transmission gear sleeve 502. As the sleeve 501 rotates, the rotating shaft 6 does not need to rotate at this time. The transmission gear sleeve 502 automatically rotates after contacting the sleeve teeth 8, actively rotating and winding the fibers captured by the winding interceptor rod 503, and winding the original filamentous fibers into a cylindrical shape.

[0036] When the winding interceptor rod 503 has obtained enough winding fibers, the transmission box 14 starts to drive the rotating shaft 6 to rotate, and the entire sleeve 501 rotates. The internal rotating shaft 6 rotates at the same time. The rotating arm 10 installed at the bottom of the rotating shaft 6 has a load ball 11 fixed at its end. The centrifugal force generated by the 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] As the conical block 9 moves upward, the entire winding intercepting rod 503 is pushed outward, and at the same time, the speed of the motor in the entire transmission box 4 is controlled. The change in the speed of the rotating shaft 6 causes the sliding sleeve 7 to move up and down, which also causes the winding intercepting rod 503 to move telescopically. The transmission gear sleeve 502 is used to continuously push the wound fibers on the winding intercepting rod 503 away. Compared with filamentous fibers, the wound fiber blocks are more convenient to intercept.

[0038] A grating 12 is also installed in the pretreatment box 1, and a scraper 13 is slidably connected to the grating 12. As the grating 12 continues to intercept, a large amount of impurities and rolled fibers adhere to its surface. At this time, the connecting line segment is driven by the transmission box 2 16 to reel, and the scraper 13 is pulled to slide on the surface of the grating 12, uniformly pushing the impurities to the guide plate 14. With the inclined design of the guide plate 14, the impurities flow along the guide plate 14 into the slag storage box 15 on one side for enrichment, and the sewage that has completed the preliminary purification is sent to the physical and chemical treatment box 2 through the hose pump 13 for deep 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 physicochemical 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. The chambers are filled with sand, activated carbon, and composite fiber materials in sequence 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 flotation chamber 18 through the hose pump 3 begins to mix with the coagulant discharged by 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 tank under the action of gravity, achieving solid-liquid separation and effectively reducing the color and suspended matter content of the sewage. Therefore, when the bottom ventilation pipe 22 is not working, sewage treatment can be achieved by simply adding chemicals and allowing the sewage to settle. However, this method is generally suitable for situations where the sewage content is small and the treatment is not urgent.

[0043] When air enters the ventilation pipe 22, the tiny bubbles generated make the suspended matter in the sewage, such as grease and fibers, adhere to the bubbles and then float to the water surface. The scum is then removed by the scraping device installed in the physical and chemical treatment box 2. This is particularly 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 secondary purified sewage 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, 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.

[0045] like Figure 7 As shown, a hose pump 25 installed on the other side of the physical and chemical 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 filler in the entire chamber.

[0046] The working principle of the present invention is as follows: the transmission assembly is used to realize the self-rotation of multiple sleeves 501, and the winding intercepting rods 503 installed on the side of the sleeves 501 are used to grab the fibers in the sewage during the rotation process;

[0047] As the sleeve 501 rotates, the transmission box 1 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 rotating arm 10 to expand, causing the sliding sleeve 7 connected to the rotating arm 10 to move upward, and uses the conical block 9 to push the winding intercepting rod 503 outward, and the rotation of the rotating shaft 6 realizes the movement of the sleeve teeth 8. The rotation of the sleeve teeth 8 drives the winding intercepting rod 503 on the sleeve 501 to rotate, and the intercepted fiber is wound. When the winding and the telescopic movement are carried out synchronously, part of the rolled fiber is detached from the winding intercepting rod 503 and attached to the surface of the grid plate 12. At the same time, the transmission box 2 16 reels the rope, and uses the scraper 13 to clean the impurities intercepted on the surface of the grid plate 12, and finally the impurities are enriched through the guide plate 14.

[0048] As the hose pump 13 and the dosing component 17 work, the sewage and the coagulant are mixed in the flotation chamber 18. At the same time, air is introduced into the ventilation pipe 22, and tiny bubbles are injected into the sewage. The scum is then removed by the scraping device. The treated sewage enters the sand filter chamber 19 through the material transfer box 23, and then enters the activated carbon filter chamber 20 along the sand filter chamber 19, and finally reaches the fiber filter chamber 21. Through the interception effect of the filter medium, the fine suspended matter, organic matter and some heavy metal ions in the sewage are further removed, and finally the treated sewage is discharged through the hose pump 25.

[0049] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to specific embodiments. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A multi-stage sewage treatment device suitable for textile technology, comprising a pretreatment tank (1) and a physicochemical treatment tank (2), characterized in that: A physicochemical treatment box (2) is installed on one side of the pretreatment box (1), a transmission box (4) is fixedly connected to the top of the pretreatment box (1), and a coiling mechanism (5) is evenly and movably connected to the bottom of the transmission box (4); The coiling mechanism (5) comprises a sleeve (501), a transmission gear sleeve (502) and a winding intercepting rod (503); the bottom of the transmission box (4) is evenly and movably connected to the sleeve (501); the inner wall of the sleeve (501) is evenly and movably connected to the transmission gear sleeve (502); the winding intercepting rod (503) is slidably connected inside the transmission gear sleeve (502); a spring (504) is fixedly mounted inside the sleeve (501) and on the winding intercepting rod; An air flotation chamber (18) is provided in the physicochemical treatment box (2), and a ventilation pipe (22) is evenly laid and installed at the bottom of the air flotation chamber (18). A sand filter chamber (19), an activated carbon filter chamber (20), and a fiber filter chamber (21) are provided in the physicochemical treatment box (2) and on the side of the air flotation chamber (18); The sleeve (501) is movably connected to a rotating shaft (6) located in the transmission box (4), the rotating shaft (6) is slidably connected to a sliding sleeve (7) located in the sleeve (501), the outer wall of the sliding sleeve (7) is fixedly connected to a conical block (9) located on the side of the winding intercepting rod (503), the outer wall of the rotating shaft (6) is fixedly connected to a sleeve tooth (8) located on the outer wall channel of the sliding sleeve (7), and the sleeve tooth (8) is meshingly connected to the transmission gear sleeve (502); The outer wall of the rotating shaft (6) is symmetrically and movably connected to a rotating arm (10), one end of the rotating arm (10) is fixedly connected to a load ball (11), and the other end of the rotating arm (10) is correspondingly and movably connected to a bottom connecting rod of the sliding sleeve (7).

2. The multi-stage sewage treatment device suitable for textile process according to claim 1 is characterized in that: A grid plate (12) is fixedly connected inside the pretreatment box (1), a scraper bar (13) is slidably connected to the grid plate (12), a transmission box 2 (16) is fixedly connected to the inner wall of the pretreatment box (1), a guide rope is symmetrically installed at the bottom of the transmission box 2 (16) and fixed to the scraper bar (13), a slag storage box (15) is fixedly installed on the side of the pretreatment box (1), a material guide plate (14) is fixedly connected to the side of the grid plate (12), and the material guide plate (14) is communicated with the slag storage box (15).

3. The multi-stage sewage treatment device suitable for textile process according to claim 2 is characterized in that: A hose pump (3) is installed on the side of the physicochemical treatment box (2), and the water inlet end of the hose pump (3) is connected to the pretreatment box (1), and the water outlet end of the hose pump (3) is connected to the air flotation chamber (18).

4. The multi-stage sewage treatment device suitable for textile process according to claim 3 is characterized in that: A dosing assembly (17) is installed on the physicochemical treatment box (2) and is located on the side connected to the flotation chamber (18). A material transfer box (23) is fixedly connected to the other side of the physicochemical treatment box (2), and the two sides of the material transfer box (23) are respectively connected to the flotation chamber (18) and the sand filter chamber (19). A sewage outlet (24) is provided on the side of the sand filter chamber (19), the activated carbon filter chamber (20) and the fiber filter chamber (21). A hose pump 2 (25) is installed on the side of the physicochemical treatment box (2), and the water inlet end of the hose pump 2 (25) is connected to the fiber filter chamber (21).

5. The multi-stage sewage treatment device suitable for textile process according to claim 4 is characterized in that: The multi-stage wastewater treatment method for this textile process is: The suspended fibers are wound and formed, and the transmission assembly works to realize the self-rotation of multiple sets of sleeves (501), and the fibers in the sewage are captured by the winding intercepting rods (503) installed on the sides of the sleeves (501) during the rotation process; As the sleeve (501) rotates, the 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 rotating arm (10) to expand, causing the sliding sleeve (7) connected to the rotating arm (10) to move upward, and uses the conical block (9) to push the winding interception rod (503) outward, and realizes the movement of the sleeve teeth (8) by rotating the rotating shaft (6). The rotation of the sleeve teeth (8) drives the winding interception rod (503) on the sleeve (501) to rotate, and the captured and intercepted fibers are wound. When the winding and the telescopic movement are synchronously performed, part of the rolled fibers are separated from the winding interception rod (503) and attached to the surface of the grid plate (12). At the same time, the transmission box (16) reels the rope, and uses the scraper (13) to clean the impurities intercepted on the surface of the grid plate (12). Finally, the impurities are enriched through the guide plate (14); Physicochemical multi-stage treatment, accompanied by the operation of hose pump 1 (3) and dosing component (17), the sewage and coagulant are uniformly mixed in the flotation chamber (18), and at the same time, air is taken into the ventilation pipe (22), and tiny bubbles are injected into the sewage. The scum is then removed by the scraping device. The treated sewage enters the sand filter chamber (19) through the material transfer box (23), and enters the activated carbon filter chamber (20) along the sand filter chamber (19), and finally reaches the fiber filter chamber (21). Through the interception effect of the filter medium, the fine suspended matter, organic matter and some heavy metal ions in the sewage are further removed, and the treated sewage is finally discharged through hose pump 2 (25).

Images