An industrial concentrated area wastewater treatment station and method

Abstract

The present invention belongs to the field of wastewater treatment, and specifically relates to an industrial centralized area wastewater treatment station and method, which includes a grit chamber, an adjustment tank, a biological oxidation tank, a chemical addition sedimentation tank, and a collecting tank connected in sequence. A grille is installed at the water inlet of the grit chamber; it also includes an electrolytic water treatment device that uses direct current to carry out oxidation-reduction reactions to reduce heavy metal ions. The electrolytic water treatment device is connected between the adjustment tank and the biological oxidation tank; the electrolytic water treatment device includes a tank body, a plurality of cathode plates, and a plurality of anode plates. During use, industrial wastewater is injected into the interior of the tank body from the water inlet, and the wastewater after electrolytic treatment is discharged from the outlet pipe and enters the biological oxidation tank for treatment. During the treatment process, relying on the cathode plates and anode plates being energized, oxidation-reduction reactions are carried out using direct current to reduce heavy metal ions, and the heavy metal ions are deposited on the cathode, thereby removing heavy metal ions from the wastewater.

Description

Technical Field

[0001] The present invention relates to the field of wastewater treatment, and specifically to an industrial centralized area wastewater treatment station and method. Background Art

[0002] Wastewater treatment uses physical, chemical, and biological methods to purify wastewater, reduce pollution, achieve wastewater recycling and reuse, and make full use of water resources.

[0003] The existing Chinese invention patent with the publication number CN110228905B discloses a wastewater treatment station and a wastewater treatment method. The wastewater treatment station includes a stirring tank, a solid-liquid separator, a regulating tank, a black film biogas digester, a biogas slurry collection tank, a homogenization tank, a first chemical addition sedimentation tank, a first-stage AO system, a second-stage AO system, an SBR aeration tank, a front-end regulating tank, a second chemical addition sedimentation tank, and a collection tank connected in sequence; it also includes an MBR membrane and RO combined system connected to the collection tank and an ozone oxidation treatment system connected to the SBR aeration tank. The wastewater treatment method adopted by the wastewater treatment station of the present invention is a five-stage comprehensive treatment method of "pretreatment - black film anaerobic - first-stage AO and second-stage AO - ozone oxidation - MBR membrane and RO advanced treatment - plant irrigation / rinsing the pen / reusing in fish ponds", which improves the wastewater treatment effect.

[0004] However, during treatment, the wastewater in industrial centralized areas contains a large amount of heavy metal ions and a wide variety of types, which are difficult to remove only through biological oxidation and chemical precipitation, and the wastewater treatment effect is poor; therefore, an industrial centralized area wastewater treatment station and method are proposed for the above problems. Summary of the Invention

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

[0006] The technical solution adopted by the present invention to solve its technical problems is: An industrial centralized area wastewater treatment station of the present invention includes a grit chamber, a regulating tank, a biological oxidation tank, a chemical addition sedimentation tank, and a collection tank connected in sequence. A grille is installed at the water inlet of the grit chamber; it also includes an electrolytic water treatment device that uses direct current to carry out redox reactions 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 includes a tank body, a plurality of cathode plates, and a plurality of anode plates. A fixing frame is fixedly connected inside the tank body, and the plurality of cathode plates and the plurality of anode plates are installed on the fixing frame. The cathode plates are 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 speed reduction motor is fixedly connected to the top of the tank body. The output end of the speed reduction motor is fixedly connected to a winding shaft. A pulling rope is installed on the winding shaft. The pulling rope penetrates through the top of the tank body and extends into the tank body. The bottom end of the pulling rope is fixedly connected to a bracket. The bracket is sleeved on the cathode plate. A connecting seat is arranged on the bracket. A scraper is installed on the connecting seat. When the bracket moves up and down, the scraper can be driven to move.

[0008] Preferably, arms are fixedly connected to both ends of the connecting seat. The arms are rotatably connected to the bracket. A pulley is rotatably connected to the end of the arm far away from the connecting seat. A guide rod is fixedly connected to the inner side wall of the tank body at a position corresponding to the pulley. Parallel inclined planes are arranged at the upper and lower ends of the guide rod. A torsion spring is installed at the rotational connection between the arm and the bracket.

[0009] Preferably, the connecting seat is composed of a first seat body and a second seat body. A groove is formed on the side surface of the second seat body. The scraper is inserted into the groove and is in sliding fit with it. 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. The output end of the electric push rod is fixedly connected to the second seat body. A guide rod is fixedly connected to the side of the second seat body close to the first seat body. The guide rod penetrates through the first seat body and is in sliding connection with it.

[0011] Preferably, a guide seat is fixedly connected to the bracket. A vertical rod is fixedly connected to the inner part of the tank body at a position corresponding to the guide seat. The vertical rod penetrates through the guide seat and is in sliding connection with it.

[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. Water distribution grooves are formed on the side of the water distribution pipe close to the cathode plate. The water distribution pipe is arranged in an S-shaped structure.

[0013] Preferably, a partition board is fixedly connected to the inner side wall of the tank body on the side close to the water outlet pipe. The distance between the bottom of the water distribution groove and the horizontal plane of 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 groove is formed at the position corresponding to the bracket on the top plate. Cover plates are hinged to both sides of the through groove.

[0015] An industrial park wastewater treatment method, which is applicable to the above-mentioned industrial park wastewater treatment station. The wastewater treatment method includes the following steps:

[0016] S1: Industrial wastewater is sent to a grit chamber. The grille at the water inlet of the grit chamber filters large solid substances. The grit chamber makes the heavier solid particles in the wastewater precipitate by gravity.

[0017] S2: The wastewater treated in the grit chamber is fed into the regulating tank to regulate the flow rate and water quality of the wastewater at different times and keep them relatively stable.

[0018] S3: The regulated wastewater is fed into the electrolytic water treatment device for electrolytic treatment to remove heavy metal ions in the wastewater.

[0019] S4: The wastewater after electrolytic treatment is fed into the biological oxidation tank, and the organic substances in the wastewater are decomposed and degraded by the metabolic action of microorganisms.

[0020] S5: The wastewater after biological oxidation treatment is fed into the chemical dosing sedimentation tank, so that the suspended solids and dissolved substances in the wastewater precipitate to the bottom of the tank, and further remove the suspended solids, dissolved substances and organic substances in the wastewater.

[0021] S6: The treated wastewater is fed into the collecting tank to be collected and waiting for discharge.

[0022] The beneficial effects of the present invention are as follows:

[0023] 1. By setting up the electrolytic water treatment device, in use, industrial wastewater is injected into the interior of the tank body from the water inlet, and the wastewater after electrolytic treatment is discharged from the water outlet pipe and enters the biological oxidation tank for treatment. During the treatment process, relying on the cathode plate and the anode plate being energized, the heavy metal ions are reduced by the oxidation-reduction reaction using direct current, and the heavy metal ions are deposited on the cathode, so as to remove the heavy metal ions in the wastewater.

[0024] 2. By setting up the reduction motor, the take-up reel, the pull rope, the bracket and the 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 the wastewater. Therefore, the staff can regularly start the reduction motor, and the reduction motor drives the take-up reel to wind up the pull rope, so as to lift the bracket up and down to drive the scraper to scrape off the deposits on the cathode plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 It is a schematic diagram of the tank body structure of the present invention;

[0028] Figure 3 It is a schematic diagram of the internal structure of the tank body of the present invention;

[0029] Figure 4 is a schematic cross-sectional structure diagram of the present invention;

[0030] Figure 5 is a schematic structure diagram of the water distribution pipe of the present invention;

[0031] Figure 6 is a schematic structure diagram of the guide rod and the support arm of the present invention;

[0032] Figure 7 is a schematic cross-sectional structure diagram of the bracket of the present invention;

[0033] Figure 8 is a flowchart of the method of the present invention;

[0034] Figure 9 is a schematic structure diagram of the water distribution pipe of the present invention.

[0035] In the figure: 1, grit chamber; 2, regulating tank; 3, electrolytic water treatment device; 4, biological oxidation tank; 5, chemical addition sedimentation tank; 6, collecting tank; 11, tank body; 12, outlet pipe; 13, inlet pipe; 14, anode plate; 15, cathode plate; 21, reduction motor; 22, take-up reel; 23, pulling 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 rod; 71, water distribution pipe; 72, water distribution trough; 8, partition board; 91, top plate; 92, cover plate. Specific embodiments

[0036] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0037] The following gives specific embodiments.

[0038] Please refer to Figures 1-5 and Figure 9As shown in the figure, an industrial park wastewater treatment station includes a grit chamber 1, an adjustment tank 2, a biological oxidation tank 4, a chemical addition sedimentation tank 5, and a collection tank 6 that are connected in sequence. A grille is installed at the water inlet of the grit chamber 1. It also includes an electrolytic water treatment device 3 that uses direct current to carry out redox reactions to reduce heavy metal ions. The electrolytic water treatment device 3 is connected between the adjustment 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. 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 installed on the fixing frame. The cathode plates 15 are located between two adjacent anode plates 14. A water inlet pipe 13 and a water outlet pipe 12 are fixedly connected to the tank body 11. During use, industrial wastewater is injected into the interior of the tank body 11 from the water inlet pipe 13. The wastewater after electrolytic treatment is discharged from the water outlet pipe 12 and enters the biological oxidation tank 4 for treatment. During the treatment process, relying on the cathode plates 15 and the anode plates 14 being energized, redox reactions are carried out using direct current to reduce heavy metal ions, and the heavy metal ions are deposited on the cathode, thereby removing heavy metal ions from the wastewater.

[0039] Further, as Figures 2-4 shown, a reduction motor 21 is fixedly connected to the top of the tank body 11. The output end of the reduction motor 21 is fixedly connected to a winding shaft 22. A pulling rope 23 is installed on the winding shaft 22. The pulling rope 23 penetrates through the top of the tank body 11 and extends into the tank body 11. The bottom end of the pulling rope 23 is fixedly connected to a support 24. The support 24 is sleeved on the cathode plate 15. A connecting seat is provided on the support 24. A scraper 25 is installed on the connecting seat. When the support 24 moves up and down, the scraper 25 can be driven to move.

[0040] 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. The reduction motor 21 drives the winding shaft 22 to wind up the pulling rope 23, thereby lifting the support 24 up and down to move, and thus driving the scraper 25 to scrape off the deposits on the cathode plate 15.

[0041] Further, as Figures 6-7 shown, both ends of the connecting seat are fixedly connected with support arms 31. The support arms 31 are rotatably connected to the support 24. The end of the support arm 31 away from the connecting seat is rotatably connected with a pulley 32. A guide rod 33 is fixedly connected to the inner side wall of the tank body 11 at a position corresponding to the pulley 32. Parallel inclined surfaces are provided at the upper and lower ends of the guide rod 33. A torsion spring is installed at the rotational connection between the support arm 31 and the support 24.

[0042] During use, the downward movement of the support 24 is achieved by gravity. If the sediment is too thick, it will block the scraper 25, causing the support 24 to be unable to move downward and scrape the sediment unstably, damaging the cathode plate 15. In this embodiment, in the initial state, its support arm 31 is inclined upward, and the torsion spring is used to keep the support arm 31 inclined. During downward movement, the inclined surface at the top of its guide rod 33 will lift the support arm 31, causing the scraper 25 to rotate, and the pulley 32 and the guide rod 33 slide away from the cathode plate 15 side, that is, rotate counterclockwise upward, increasing the distance between the scraper 25 and the cathode plate 15. During upward movement, the inclined surface at the bottom of the guide rod 33 presses, and the inclined surface at the top of the guide rod 33 will press to cause the support arm 31 and the scraper 25 to rotate, making the scraper 25 fit the surface of the cathode plate 15, and the pulley 32 and the guide rod 33 slide away from the cathode plate 15 side.

[0043] Further, as Figure 7 shown, the connecting seat is composed of a first seat body 41 and a second seat body 42. A groove is formed on the side surface of the second seat body 42. The scraper 25 is inserted into the groove and is in sliding fit with it. A pressure sensor 43 is installed between the scraper 25 and the second seat body 42;

[0044] During scraping, since the components of the sediment deposited on the cathode plate 15 in the wastewater are complex and the deposition thickness is uneven, and the position of the scraper 25 is fixed, forcibly scraping thicker and harder sediments is likely to damage the surface of the cathode plate 15. In this implementation, the scraper 25 is slidably installed in the groove, and the pressure sensor 43 can be relied on to monitor the scraping resistance of the scraper 25, facilitating the staff to adjust and handle according to the situation.

[0045] Further, as Figure 7 shown, an electric push rod 51 is fixedly connected to the first seat body 41. 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. The guide rod 52 penetrates the first seat body 41 and is in sliding connection with it;

[0046] During use, relying on the electric push rod 51 can push the second seat body 42 and the scraper 25, thereby adjusting 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 sediments with higher thickness and hardness, the distance between the scraper 25 and the cathode plate 15 is increased, reducing the thickness of a single scrape, thereby protecting the cathode plate 15.

[0047] Further, as Figures 3-6 shown, a guide seat 61 is fixedly connected to the support 24. A vertical rod 62 is fixedly connected to the corresponding position inside the groove body 11 and the guide seat 61. The vertical rod 62 penetrates the guide seat 61 and is in sliding connection with it;

[0048] During 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 its stability and reducing the occurrence of shaking.

[0049] Furthermore, as Figures 3-5 shown, 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 groove 72 is formed on the side of the water distribution pipe 71 close to the cathode plate 15. The water distribution pipe 71 is arranged in an S-shaped structure;

[0050] During use, the 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 groove 72, which is convenient for deposition.

[0051] Furthermore, as Figures 2-4 shown, a partition plate 8 is fixedly connected to the inner side wall of the tank body 11 near the water outlet pipe 12. The distance between the bottom of the water distribution groove 72 and the horizontal plane of the bottom surface of the cathode plate 15 is 50-70 cm;

[0052] During use, the wastewater will move downward along the bottom side of the cathode plate 15 and then flow through the bottom of the partition plate 8. The distance between the bottom of the water distribution groove 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 sediment at the bottom of the cathode plate 15 thinner and the scraping resistance lower. In this way, it is convenient for the scraper 25 to strip 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.

[0053] Furthermore, as Figures 3-4 shown, a top plate 91 is fixedly connected to the inner side wall of the tank body 11. The top plate 91 is located above the cathode plate 15. Through grooves are formed at the positions corresponding to the brackets 24 on the top plate 91. Cover plates 92 are hinged on both sides of the through grooves;

[0054] During use, the top plate 91 separates the upper part of the tank body 11 from the wastewater. 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 plate 8, and it relies on the bracket 24 to push up to open the through groove.

[0055] As Figure 8 shown, an industrial park wastewater treatment method, which is applicable to the above-mentioned industrial park wastewater treatment station. The wastewater treatment method includes the following steps:

[0056] S1: The industrial wastewater is fed into the grit chamber 1. The grille at the inlet of the grit chamber 1 filters out large particulate solid substances. The heavier solid particles in the wastewater precipitate in the grit chamber 1 by gravity.

[0057] S2: The wastewater treated by the grit chamber is fed into the regulating tank 2 to regulate the flow rate and water quality of the wastewater at different times and keep them relatively stable.

[0058] S3: The regulated wastewater is fed into the electrolytic water treatment device 3 for electrolytic treatment to remove heavy metal ions in the wastewater.

[0059] S4: The wastewater after electrolytic treatment is fed into the biological oxidation tank 4. Using the metabolic action of microorganisms, the organic substances in the wastewater are decomposed and degraded.

[0060] S5: The wastewater after biological oxidation treatment is fed into the chemical addition sedimentation tank 5 to precipitate the suspended solids and dissolved substances in the wastewater to the bottom of the tank, further removing the suspended solids, dissolved substances and organic substances in the wastewater.

[0061] S6: The treated wastewater is fed into the collecting tank 6 to be collected and wait for discharge.

[0062] In the description of this specification, the descriptions referring to the terms "an embodiment", "example", "specific example", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do 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.

[0063] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art of this industry should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and all these changes and improvements fall within the scope of the present invention claimed.

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 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) 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); 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 the 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; a partition plate (8) is fixedly connected to the inner side wall of the trough body (11) close to the water outlet pipe (12), and 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.

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 trough body (11), and a winding shaft (22) is fixedly connected to the output end of the reduction motor (21). A pull rope (23) is installed on the winding shaft (22). The pull rope (23) passes through the top of the trough body (11) and extends into the trough body (11). The bottom end of the pull rope (23) is fixedly connected to a bracket (24). 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, 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 with 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 with a pulley (32), the inner side wall of the groove body (11) is fixedly connected with a guide rod (33) at a position corresponding to the pulley (32), 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 base body (41), an output end of the electric push rod (51) is fixedly connected to the second base body (42), a guide rod (52) is fixedly connected to a side of the second base body (42) close to the first base body (41), and the guide rod (52) passes through the first base 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. The industrial concentrated area wastewater treatment station according to claim 1, characterized in that: 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 at a position corresponding to the bracket (24) on the top plate (91), and cover plates (92) are hingedly connected to both sides of the through groove.

8. 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) to be collected and discharged.

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