Industrial concentration area wastewater treatment station and method

Abstract

The invention belongs to the field of wastewater treatment, and particularly relates to an industrial concentration area wastewater treatment station and method.The industrial concentration area wastewater treatment station comprises a grit chamber, an adjusting tank, a biological oxidation tank, a dosing sedimentation tank and a water collecting tank which are sequentially connected, and a grating is installed at a water inlet of the grit chamber; the electrolyzed water treatment device is used for reducing heavy metal ions by carrying out oxidation-reduction reaction by utilizing direct current and is connected between the regulating tank and the biological oxidation tank; the electrolytic water treatment device comprises a tank body, a plurality of cathode plates and a plurality of anode plates, during use, industrial wastewater is injected into the tank body from the water inlet, the wastewater subjected to electrolytic treatment is discharged from the water outlet pipe and enters the biological oxidation pond to be treated, and in the treatment process, the cathode plates and the anode plates are powered on, so that the wastewater is treated; direct current is used for carrying out redox reaction to reduce the heavy metal ions, and the heavy metal ions are deposited at the cathode, so that the heavy metal ions in the wastewater are removed.

Description

Technical Field

[0001] The invention relates to the field of wastewater treatment, in particular to an industrial concentrated area wastewater treatment station and method. Background Art

[0002] Wastewater treatment is the use of physical, chemical and biological methods to purify wastewater in order to reduce pollution, recycle and reuse wastewater, and make full use of water resources.

[0003] The existing Chinese invention patent with publication number CN110228905B discloses a wastewater treatment station and a wastewater treatment method, wherein the wastewater treatment station includes a stirring tank, a solid-liquid separator, a regulating tank, a black film biogas tank, a biogas collection tank, a homogenizing tank, a first dosing sedimentation tank, a primary AO system, a secondary AO system, an SBR aeration tank, a front regulating tank, a second dosing sedimentation tank and a water collection tank connected in sequence; and also includes an MBR membrane and RO combined system connected to the water collection tank and an ozone oxidation treatment system connected to the SBR aeration tank. The wastewater treatment station of the present invention adopts a five-level comprehensive treatment method of "pretreatment-black film anaerobic-primary AO and secondary AO-ozone oxidation-MBR membrane and RO deep treatment-plant irrigation / fence reuse / fish pond" to improve the wastewater treatment effect.

[0004] However, during treatment, the wastewater in industrial concentrated areas contains a large amount of heavy metal ions, and the types are complex. It is difficult to remove them only through biological oxidation and chemical precipitation, and the wastewater treatment effect is poor. Therefore, a wastewater treatment station and method for industrial concentrated areas are proposed to address the above problems. Summary of the invention

[0005] In order to solve the problems raised in the background technology, the present invention proposes an industrial concentrated area wastewater treatment station and method.

[0006] The technical solution adopted by the present invention to solve its technical problems is: the industrial concentrated area wastewater treatment station described in the present invention comprises a grit chamber, a regulating tank, a biological oxidation tank, a dosing sedimentation tank and a water collection tank which are connected in sequence, and a grid is installed at the water inlet of the grit chamber; it also comprises an electrolytic water treatment device which uses direct current to carry out oxidation-reduction reaction to reduce heavy metal ions, and the electrolytic water treatment device is connected between the regulating tank and the biological oxidation tank; the electrolytic water treatment device comprises a tank body, a plurality of cathode plates and a plurality of anode plates, a fixing frame is fixedly connected inside the tank body, a plurality of the cathode plates and a plurality of the anode plates are installed on the fixing frame, the cathode plate is located between two adjacent anode plates, and a water inlet pipe and a water outlet pipe are fixedly connected to the tank body.

[0007] Preferably, a reduction motor is fixedly connected to the top of the trough body, a winding shaft is fixedly connected to the output end of the reduction motor, a pull rope is installed on the winding shaft, the pull rope passes through the top of the trough body and extends into the trough body, a bracket is fixedly connected to the bottom end of the pull rope, the bracket is sleeved on the cathode plate, a connecting seat is provided on the bracket, a scraper is installed on the connecting seat, and when the bracket moves up and down, it can drive the scraper to move.

[0008] Preferably, both ends of the connecting seat are fixed with a support arm, the support arm and the bracket are rotatably connected, the end of the support arm away from the connecting seat is rotatably connected to a pulley, a guide rod is fixedly connected to the inner side wall of the trough body at a position corresponding to the pulley, the upper and lower ends of the guide rod are provided with parallel inclined surfaces, and a torsion spring is installed at the rotatable connection between the support arm and the bracket.

[0009] Preferably, the connecting seat is composed of a first seat body and a second seat body, a groove is provided on the side of the second seat body, the scraper is inserted into the groove and slidably cooperates with the groove, and a pressure sensor is installed between the scraper and the second seat body.

[0010] Preferably, an electric push rod is fixedly connected to the first seat body, an output end of the electric push rod is fixedly connected to the second seat body, a guide rod is fixedly connected to a side of the second seat body close to the first seat body, and the guide rod passes through the first seat body and is slidably connected thereto.

[0011] Preferably, a guide seat is fixedly connected to the bracket, and a vertical rod is fixedly connected to the interior of the groove body and the corresponding position of the guide seat, and the vertical rod passes through the guide seat and is slidably connected thereto.

[0012] Preferably, a plurality of water distribution pipes are fixedly connected to the water inlet pipe, the water distribution pipes are located on both sides of the cathode plate, a water distribution trough is provided on one side of the water distribution pipe close to the cathode plate, and the water distribution pipes are arranged in an S-shaped structure.

[0013] Preferably, a partition is fixedly connected to the inner wall of the tank body on the side close to the water outlet pipe, and the distance between the horizontal plane of the bottom of the water distribution tank and the bottom surface of the cathode plate is 50-70 cm.

[0014] Preferably, a top plate is fixedly connected to the inner side wall of the tank body, the top plate is located above the cathode plate, a through slot is formed at a position corresponding to the bracket on the top plate, and cover plates are hinged on both sides of the through slot.

[0015] A method for treating wastewater in an industrial concentrated area, which is applicable to the above-mentioned wastewater treatment station in the industrial concentrated area, comprises the following steps: S1: Industrial wastewater is sent to the grit chamber. The screen at the water inlet of the grit chamber filters large solid particles. The grit chamber settles the heavier solid particles in the wastewater through gravity. S2: The wastewater treated in the sedimentation tank is sent to the regulating tank to adjust the flow and water quality of the wastewater at different times to keep it relatively stable; S3: The conditioned wastewater is sent to an electrolytic water treatment device for electrolytic treatment to remove heavy metal ions in the wastewater; S4: The wastewater after electrolysis treatment is sent to the biological oxidation tank, where the organic matter in the wastewater is decomposed and degraded by the metabolism of microorganisms; S5: The wastewater after biological oxidation treatment is sent to the dosing sedimentation tank to make the suspended matter and dissolved matter in the wastewater settle to the bottom of the tank, and further remove the suspended matter, dissolved matter and organic matter in the wastewater. S6: The treated wastewater is sent to the collection tank for collection and discharge.

[0016] The present invention is beneficial in that: 1. The present invention provides an electrolytic water treatment device. When in use, industrial wastewater is injected into the tank from the water inlet, and the wastewater after electrolysis treatment is discharged from the outlet pipe and enters the biological oxidation tank for treatment. During the treatment process, the cathode plate and the anode plate are energized, and the direct current is used to perform an oxidation-reduction reaction to reduce the heavy metal ions, and the heavy metal ions are deposited at the cathode, thereby removing the heavy metal ions in the wastewater; 2. The present invention sets a reduction motor, a winding shaft, a pull rope, a bracket and a scraper. During long-term use, heavy metal ions are deposited on the cathode plate. As the thickness increases, it will affect the electrolytic treatment of wastewater. Therefore, the staff can start the reduction motor regularly. The reduction motor drives the winding shaft to wind up the pull rope, thereby lifting the bracket up and down to move it up and down, thereby driving the scraper to scrape off the deposits on the cathode plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the tank structure of the present invention; Figure 3 It is a schematic diagram of the internal structure of the tank body of the present invention; Figure 4 It is a cross-sectional structural schematic diagram of the present invention; Figure 5 It is a structural schematic diagram of the water distribution pipe of the present invention; Figure 6It is a schematic diagram of the guide rod and support arm structure of the present invention; Figure 7 It is a schematic structural diagram of a cross-section of the stent of the present invention; Figure 8 is a flow chart of the method of the present invention; Fig. 9 It is a schematic diagram of the structure of the water distribution pipe of the present invention.

[0019] In the figure: 1. grit chamber; 2. regulating tank; 3. electrolytic water treatment device; 4. biological oxidation tank; 5. dosing sedimentation tank; 6. water collecting tank; 11. tank body; 12. outlet pipe; 13. inlet pipe; 14. anode plate; 15. cathode plate; 21. reduction motor; 22. reel; 23. pull rope; 24. bracket; 25. scraper; 31. support arm; 32. pulley; 33. guide rod; 41. first seat body; 42. second seat body; 43. pressure sensor; 51. electric push rod; 52. guide rod; 61. guide seat; 62. vertical pole; 71. water distribution pipe; 72. water distribution tank; 8. partition; 91. top plate; 92. cover plate. DETAILED DESCRIPTION

[0020] 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.

[0021] Specific examples are given below.

[0022] See also Figure 1-5 and Fig. 9As shown, a wastewater treatment station in an industrial concentration area includes a grit chamber 1, a regulating tank 2, a biological oxidation tank 4, a dosing sedimentation tank 5 and a water collection tank 6 connected in sequence, wherein the water inlet of the grit chamber 1 is provided with a grid; further comprising an electrolytic water treatment device 3 for reducing heavy metal ions by oxidation-reduction reaction using direct current, wherein the electrolytic water treatment device 3 is connected between the regulating tank 2 and the biological oxidation tank 4; the electrolytic water treatment device 3 includes a tank body 11, a plurality of cathode plates 15 and a plurality of anode plates 14, wherein a fixing frame is fixedly connected inside the tank body 11, and the plurality of cathode plates 15 and A plurality of anode plates 14 are mounted on a fixing frame, a cathode plate 15 is located between two adjacent anode plates 14, and an inlet pipe 13 and an outlet pipe 12 are fixedly connected to the tank body 11; when in use, industrial wastewater is injected into the tank body 11 from the inlet pipe 13, and the wastewater after electrolysis treatment is discharged from the outlet pipe 12 into the biological oxidation tank 4 for treatment. During the treatment process, the cathode plate 15 and the anode plate 14 are energized, and direct current is used to carry out oxidation-reduction reaction to reduce heavy metal ions, and the heavy metal ions are deposited at the cathode, thereby removing heavy metal ions in the wastewater.

[0023] Further, such as Figure 2-4 As shown, a reduction motor 21 is fixedly connected to the top of the tank body 11, and a reel 22 is fixedly connected to the output end of the reduction motor 21. A pull rope 23 is installed on the reel 22. The pull rope 23 passes through the top of the tank body 11 and extends into the tank body 11. A bracket 24 is fixedly connected to the bottom end of the pull rope 23. The bracket 24 is sleeved on the cathode plate 15. A connecting seat is provided on the bracket 24. A scraper 25 is installed on the connecting seat. When the bracket 24 moves up and down, the scraper 25 can be driven to move; During long-term use, heavy metal ions are deposited on the cathode plate 15 . As the thickness increases, it will affect the electrolytic treatment of wastewater. Therefore, in this embodiment, the staff can regularly start the reduction motor 21 , and the reduction motor 21 drives the winding shaft 22 to wind up the pull rope 23 , so as to lift the bracket 24 up and down to move it up and down, thereby driving the scraper 25 to scrape off the deposits on the cathode plate 15 .

[0024] Further, such as Figure 6-7 As shown, both ends of the connecting seat are fixedly connected with a support arm 31, the support arm 31 is rotatably connected to the bracket 24, one end of the support arm 31 away from the connecting seat is rotatably connected to a pulley 32, and a guide rod 33 is fixedly connected at the inner side wall of the trough body 11 corresponding to the pulley 32, and the upper and lower ends of the guide rod 33 are provided with parallel inclined surfaces, and a torsion spring is installed at the rotatable connection between the support arm 31 and the bracket 24; When in use, the bracket 24 moves downward by gravity. If the sediment is too thick, it will block the scraper 25, making it impossible for the bracket 24 to move downward and the scraping of the sediment will be unstable, thereby damaging the cathode plate 15. In this embodiment, in the initial state, the support arm 31 is arranged to be tilted upward, and the torsion spring is used to keep the support arm 31 tilted. When moving downward, the inclined surface at the top of the guide rod 33 will lift the support arm 31, and the scraper 25 will rotate. The pulley 32 and the guide rod 33 will slide away from the cathode plate 15, that is, rotate upward counterclockwise to increase the distance between the scraper 25 and the cathode plate 15. When moving upward, the inclined surface at the bottom of the guide rod 33 is squeezed, and the inclined surface at the top of the guide rod 33 will squeeze to cause the support arm 31 and the scraper 25 to rotate, so that the scraper 25 and the surface of the cathode plate 15 fit together, and the pulley 32 and the guide rod 33 slide away from the cathode plate 15.

[0025] Further, such as Figure 7 As shown, the connecting seat is composed of a first seat body 41 and a second seat body 42. A groove is provided on the side of the second seat body 42. The scraper 25 is inserted into the groove and slidably cooperates with the groove. A pressure sensor 43 is installed between the scraper 25 and the second seat body 42. During scraping, since the sediment deposited on the cathode plate 15 in the wastewater has complex composition and varying thickness, the position of the scraper 25 is fixed. Forcibly scraping thicker and harder sediments can easily damage the surface of the cathode plate 15. In this embodiment, the scraper 25 is slidably installed in the groove, and the pressure sensor 43 can monitor the scraping resistance of the scraper 25, which is convenient for the staff to adjust and handle according to the situation.

[0026] Further, such as Figure 7 As shown, an electric push rod 51 is fixedly connected to the first seat body 41, and the output end of the electric push rod 51 is fixedly connected to the second seat body 42. A guide rod 52 is fixedly connected to the side of the second seat body 42 close to the first seat body 41, and the guide rod 52 passes through the first seat body 41 and is slidably connected thereto; When in use, the electric push rod 51 can push the second seat body 42 and the scraper 25, so as to adjust the distance between the scraper 25 and the cathode plate 15. According to the scraping resistance of the scraper 25 obtained by the pressure sensor 43, when encountering thicker and harder deposits, the distance between the scraper 25 and the cathode plate 15 is increased, and the thickness of the scraping is reduced, thereby protecting the cathode plate 15.

[0027] Further, such as Figure 3-6 As shown, a guide seat 61 is fixedly connected to the bracket 24, and a vertical rod 62 is fixedly connected to the inside of the groove body 11 and the corresponding position of the guide seat 61, and the vertical rod 62 passes through the guide seat 61 and is slidably connected thereto; When in use, the guide seat 61 can slide on the vertical rod 62, so it can guide the guide seat 61 and the bracket 24, thereby improving their stability and reducing shaking.

[0028] Further, such as Figure 3-5 As shown, a plurality of water distribution pipes 71 are fixedly connected to the water inlet pipe 13, and the water distribution pipes 71 are located on both sides of the cathode plate 15. A water distribution trough 72 is provided on one side of the water distribution pipe 71 close to the cathode plate 15, and the water distribution pipe 71 is arranged in an S-shaped structure; When in use, wastewater is injected into the water distribution pipe 71 through the water inlet pipe 13, and then the wastewater is distributed on both sides of the cathode plate 15 by relying on the water distribution pipe 71, so as to improve the uniformity of wastewater distribution and the uniformity of the thickness of the sediment on the cathode plate 15, and the wastewater is sprayed onto the cathode plate 15 through the water distribution trough 72 to facilitate deposition.

[0029] Further, such as Figure 2-4 As shown, a partition plate 8 is fixedly connected to the inner wall of the tank body 11 near the water outlet pipe 12, and the distance between the bottom of the water distribution tank 72 and the horizontal plane of the bottom surface of the cathode plate 15 is 50-70 cm; When in use, the waste water will move downward along the bottom side of the cathode plate 15, and then flow through the bottom of the partition 8. The distance between the bottom of the water distribution trough 72 and the horizontal plane of the bottom surface of the cathode plate 15 is 50-70 cm, which will make the deposition thickness of the bottom sediment of the cathode plate 15 thinner and the resistance to scraping lower, so that the scraper 25 can easily peel off the sediment and the cathode plate 15 at the bottom to form a notch, which is convenient for scraping. The notch refers to the opening formed by the separation of the sediment layer and the cathode plate 15 during the process of scraping the sediment layer on the scraper 25.

[0030] Further, such as Figure 3-4 As shown, a top plate 91 is fixedly connected to the inner side wall of the tank body 11, and the top plate 91 is located above the cathode plate 15. A through groove is formed on the top plate 91 at a position corresponding to the bracket 24, and cover plates 92 are hinged on both sides of the through groove. When in use, the top plate 91 separates the top of the trough body 11 from the waste water. When not scraping, the bracket 24 is placed above the top plate 91 to play a protective role. The top plate 91 is hinged to the partition 8, and it is pushed up by the bracket 24 to open the through groove.

[0031] like Figure 8 As shown, a method for treating wastewater in industrial concentrated areas is applicable to the above-mentioned wastewater treatment station in industrial concentrated areas. The method for treating wastewater comprises the following steps: S1: Industrial wastewater is sent to the grit chamber 1. The grille at the water inlet of the grit chamber 1 filters large solid particles. The grit chamber 1 precipitates the heavier solid particles in the wastewater through gravity. S2: The wastewater treated in the sedimentation tank is sent to the regulating tank 2 to adjust the flow and water quality of the wastewater at different times to keep it relatively stable; S3: The conditioned wastewater is sent to the electrolytic water treatment device 3 for electrolytic treatment to remove heavy metal ions in the wastewater; S4: The wastewater after electrolysis treatment is sent to the biological oxidation tank 4, where the organic matter in the wastewater is decomposed and degraded by the metabolism of microorganisms; S5: The wastewater after biological oxidation treatment is sent to the dosing sedimentation tank 5, so that the suspended matter and dissolved matter in the wastewater are precipitated to the bottom of the tank, and the suspended matter, dissolved matter and organic matter in the wastewater are further removed; S6: The treated wastewater is sent to the collection tank 6 for collection and waiting for discharge.

[0032] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0033] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A wastewater treatment station in an industrial concentration area, comprising a grit chamber (1), a regulating tank (2), a biological oxidation tank (4), a dosing sedimentation tank (5) and a water collection tank (6) connected in sequence, wherein a grid is installed at the water inlet of the grit chamber (1); characterized in that: It also includes an electrolytic water treatment device (3) for reducing heavy metal ions by means of a redox reaction using direct current, wherein the electrolytic water treatment device (3) is connected between the regulating tank (2) and the biological oxidation tank (4); The electrolytic water treatment device (3) comprises a tank body (11), a plurality of cathode plates (15) and a plurality of anode plates (14); a fixing frame is fixedly connected inside the tank body (11); the plurality of cathode plates (15) and the plurality of anode plates (14) are mounted on the fixing frame; the cathode plate (15) is located between two adjacent anode plates (14); and a water inlet pipe (13) and a water outlet pipe (12) are fixedly connected to the tank body (11).

2. The industrial wastewater treatment station according to claim 1, characterized in that: A reduction motor (21) is fixedly connected to the top of the tank body (11), a reel (22) is fixedly connected to the output end of the reduction motor (21), a pull rope (23) is installed on the reel (22), the pull rope (23) passes through the top of the tank body (11) and extends into the tank body (11), a bracket (24) is fixedly connected to the bottom end of the pull rope (23), the bracket (24) is sleeved on the cathode plate (15), a connecting seat is provided on the bracket (24), a scraper (25) is installed on the connecting seat, and when the bracket (24) moves up and down, it can drive the scraper (25) to move.

3. The industrial wastewater treatment station according to claim 2, characterized in that: Both ends of the connection seat are fixedly connected to a support arm (31), the support arm (31) and the bracket (24) are rotatably connected, one end of the support arm (31) away from the connection seat is rotatably connected to a pulley (32), a guide rod (33) is fixedly connected to the inner side wall of the groove body (11) at a position corresponding to the pulley (32), and the upper and lower ends of the guide rod (33) are provided with parallel inclined surfaces, and a torsion spring is installed at the rotatable connection between the support arm (31) and the bracket (24).

4. The industrial wastewater treatment station according to claim 2, characterized in that: The connecting seat is composed of a first seat body (41) and a second seat body (42); a groove is provided on the side of the second seat body (42); the scraper (25) is inserted into the groove and slidably cooperates with the groove; a pressure sensor (43) is installed between the scraper (25) and the second seat body (42).

5. The industrial wastewater treatment station according to claim 4, characterized in that: An electric push rod (51) is fixedly connected to the first seat body (41), an output end of the electric push rod (51) is fixedly connected to the second seat body (42), a guide rod (52) is fixedly connected to a side of the second seat body (42) close to the first seat body (41), and the guide rod (52) passes through the first seat body (41) and is slidably connected thereto.

6. The industrial concentrated area wastewater treatment station according to claim 2, characterized in that: A guide seat (61) is fixedly connected to the bracket (24), and a vertical rod (62) is fixedly connected to the interior of the groove body (11) and at a position corresponding to the guide seat (61). The vertical rod (62) passes through the guide seat (61) and is slidably connected thereto.

7. An industrial wastewater treatment station according to any one of claims 1 to 6, characterized in that: A plurality of water distribution pipes (71) are fixedly connected to the water inlet pipe (13), the water distribution pipes (71) are located on both sides of the cathode plate (15), a water distribution trough (72) is provided on one side of the water distribution pipe (71) close to the cathode plate (15), and the water distribution pipe (71) is arranged in an S-shaped structure.

8. The industrial concentrated area wastewater treatment station according to claim 7, characterized in that: A partition plate (8) is fixedly connected to the inner wall of the tank body (11) on the side close to the water outlet pipe (12), and the distance between the bottom of the water distribution tank (72) and the horizontal plane of the bottom surface of the cathode plate (15) is 50-70 cm.

9. The industrial wastewater treatment station according to claim 8, characterized in that: A top plate (91) is fixedly connected to the inner side wall of the tank body (11), the top plate (91) being located above the cathode plate (15), a through slot being formed on the top plate (91) at a position corresponding to the bracket (24), and cover plates (92) being hingedly connected to both sides of the through slot.

10. A method for treating wastewater in industrial concentrated areas, characterized in that: The wastewater treatment method is applicable to the industrial concentrated area wastewater treatment station described in any one of claims 1 to 6, and the wastewater treatment method comprises the following steps: S1: Industrial wastewater is sent to the grit chamber (1). The grit chamber (1) filters large solid particles at the water inlet. The grit chamber (1) causes the heavier solid particles in the wastewater to settle by gravity. S2: The wastewater treated in the sedimentation tank is sent to the regulating tank (2) to adjust the flow rate and water quality of the wastewater at different times to keep it relatively stable; S3: The conditioned wastewater is sent to an electrolytic water treatment device (3) for electrolytic treatment to remove heavy metal ions in the wastewater; S4: The wastewater after electrolysis treatment is sent to the biological oxidation tank (4), where the organic matter in the wastewater is decomposed and degraded by the metabolism of microorganisms; S5: The wastewater after biological oxidation treatment is sent to a dosing sedimentation tank (5) to allow suspended matter and dissolved matter in the wastewater to settle to the bottom of the tank, thereby further removing suspended matter, dissolved matter and organic matter in the wastewater; S6: The treated wastewater is sent to the collection tank (6) for collection and discharge.

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