Sewage treatment device and treatment method

Abstract

The present invention discloses a sewage treatment device and method, comprising a collection tank, a sewage treatment tank, multiple reagent tanks, a testing tank, a sludge tank, and a filter press. The sewage treatment tank is provided with a first reaction tank and a second reaction tank, separated by a partition. The partition is provided with a liquid port, which can be opened or closed by a gate to connect or block the first and second reaction tanks. The present invention treats sewage by adding corresponding reagents to the first and second reaction tanks, allowing the treated sewage to be discharged, thereby solving the problem of sewage treatment.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and more particularly to a sewage treatment device and a treatment method. Background Art

[0002] Laser film, cold stamping film and other products will generate a lot of wastewater during the production process. These wastewaters contain a large amount of impurities, hexavalent chromium and other pollutants and cannot be discharged directly. Therefore, it is urgent to design a device that can treat these wastewaters. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art and provide a sewage treatment device and treatment method. By adding corresponding reagents into the first reaction tank and the second reaction tank, the sewage can be treated so that the treated sewage can be discharged, thereby solving the problem of sewage treatment.

[0004] In order to achieve the above-mentioned object, the present invention adopts the following technical solution: a sewage treatment device, comprising a collection tank, a sewage treatment tank, a plurality of reagent tanks, a test tank, a sludge tank and a filter press;

[0005] The sewage treatment tank is provided with a first reaction tank and a second reaction tank, the first reaction tank and the second reaction tank are separated by a partition, the partition is provided with a liquid outlet, and the liquid outlet can be opened or closed by an opening and closing gate to connect or block the first reaction tank and the second reaction tank;

[0006] The first reaction tank includes a first liquid inlet, a first liquid outlet and a first mud discharge outlet arranged from high to low, and the collecting tank is connected to the first liquid inlet and the first liquid outlet through pipelines respectively. The second reaction tank includes a second liquid inlet, a second liquid outlet, a third liquid outlet and a second mud discharge outlet arranged from high to low, and the inspection tank is connected to the second liquid inlet and the second liquid outlet through pipelines respectively. The first reaction tank and the second reaction tank are connected to the corresponding reagent tanks through pipelines respectively, the first mud discharge outlet and the second mud discharge outlet are connected to the sludge tank through pipelines respectively, the sludge tank is connected to the collecting tank and the filter press through pipelines respectively, and the filter press is connected to the collecting tank through a pipeline.

[0007] Furthermore, the first liquid outlet and the third liquid outlet are connected through a U-shaped tube, the two vertical sections of the U-shaped tube are respectively connected to the first liquid outlet and the third liquid outlet, the two ends of the horizontal section of the U-shaped tube are respectively connected to the upper ends of the two vertical sections, the position of the horizontal section is higher than the liquid level height of the first reaction tank, and a water pump is connected to the horizontal section.

[0008] Furthermore, the opening and closing gate includes a driving mechanism and a gate plate, and the driving mechanism can drive the gate plate to move up and down so that the gate plate covers the liquid port or opens the liquid port.

[0009] Furthermore, the driving mechanism includes two groups of driving units, which are located on both sides of the gate plate. The driving units include a motor, a guide shaft and a screw. The lower end of the guide shaft is fixed to the bottom of the sewage treatment tank and the upper end is movably connected to the lower end of the screw. The upper end of the screw is connected to the motor, and the gate plate is respectively connected to the screw and the guide shaft.

[0010] Furthermore, connecting ribs are provided at both ends of the upper portion of the gate plate, and threaded sleeves are provided at the upper ends of the connecting ribs. The two threaded sleeves are respectively threadedly connected to the two screw rods. Sliding sleeves are provided at both ends of the lower portion of the gate plate, and the sliding sleeves are arranged on the outside of the corresponding guide shaft.

[0011] Furthermore, a connector is fixed to the upper end of the guide shaft, and the connector is fixed to the inner wall of the first reaction tank. The lower end of the screw is inserted into the connector and connected to the guide shaft through a bearing. The position of the connector is higher than the liquid level of the first reaction tank.

[0012] Furthermore, the gate plate includes a liquid flow area located at its upper part, a plurality of baffles are provided in the liquid flow area, a liquid flow unit is provided between two adjacent baffles, the liquid flow unit includes a liquid inlet head and an outlet, side cavities are provided between the two sides of the liquid inlet head and the baffles, side ports are provided on both sides of the liquid inlet head, a through hole is provided on the side of the liquid inlet head facing the second reaction tank, and the side ports, side cavities, through holes and outlet are connected.

[0013] Furthermore, the liquid passing unit further includes a diversion cavity, guide ribs are provided on both sides of the baffle, the outlet is directly opposite to the guide ribs, and the diversion cavity is connected to the confluence cavity and is divided by the guide ribs.

[0014] Furthermore, a sealing gasket is fixed on the peripheral side of the liquid outlet toward the first reaction tank, and the side of the gate plate abuts the sealing gasket. A first agitator is provided inside the first reaction tank, and a second agitator is provided inside the second reaction tank. A pH detector is installed in both the first reaction tank and the second reaction tank, and an ORP detector is installed in the first reaction tank.

[0015] A sewage treatment method comprises the following steps:

[0016] S1. Pump the sewage in the collection tank into the first reaction tank through a water pump until the liquid level reaches h1, and start the first agitator;

[0017] S2. Add hydrochloric acid from the corresponding reagent pool into the first reaction pool until the pH value detector detects that the pH value is between 2 and 3;

[0018] S3. Add the reducing agent in the corresponding reagent pool into the first reaction pool until the instrument reading of the ORP detector is between 230MV and 270MV, and react for 10 minutes;

[0019] S4, adding sodium hydroxide in the corresponding reagent pool into the first reaction pool until the pH value detector detects that the pH value is 11;

[0020] S5, turn off the first agitator and let it settle for 1 hour;

[0021] S6: The liquid in the first reaction tank is discharged. The motor drives the gate to move slowly downward. The liquid between the liquid levels h1 and h2 enters the second reaction tank through the liquid outlet. The liquid between the liquid levels h2 and h3 enters the collection tank again through the first liquid outlet. The mud below the liquid level h3 enters the sludge tank through the first mud outlet.

[0022] S7, repeating steps S1 to S6 until the liquid level in the second reaction tank reaches h4, and closing the liquid outlet;

[0023] S8, turn on the second agitator, and add ferrous sulfate and hydrochloric acid in the corresponding reagent tank into the second reaction tank until the pH detector detects that the pH value is 8-8.5;

[0024] S9, adding PAC and PAM in the corresponding reagent pool into the second reaction pool, and turning off the second agitator to settle for 2 hours;

[0025] S10, draining the liquid in the second reaction tank, discharging the liquid between the liquid level h4 and h5 into the inspection tank from the second liquid outlet, and discharging qualified liquid from the inspection tank into the municipal sewage pipeline, discharging the liquid between the liquid level h5 and h6 into the first reaction tank from the first liquid outlet through the U-shaped pipe, and discharging the liquid below the liquid level h6 into the sludge tank from the second sludge outlet;

[0026] S11. The sludge in the sludge pool is discharged into the filter press for filtration, and the sludge and liquid are separated by the filter press. The separated liquid is then transported back to the collection tank through a pipeline;

[0027] S12. Complete sewage treatment.

[0028] In summary, the present invention has the following beneficial effects:

[0029] By setting up a collection tank, a first reaction tank, a second reaction tank, a test tank and a sludge tank, sewage treatment can be achieved. After each sewage treatment, the liquid in the first reaction tank and the second reaction tank can be emptied, and the liquid at different positions can be transported to the corresponding area through pipes for collection, which can greatly improve the sewage treatment effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Schematic diagram of the structure of this embodiment;

[0031] Figure 2 1 is a process flow chart of this embodiment;

[0032] Figure 3 It is a structural diagram of the sewage treatment pool;

[0033] Figure 4 This is a cross-sectional view of a sewage treatment tank;

[0034] Figure 5 for Figure 4 Enlarged view at point A;

[0035] Figure 6 It is a structural diagram of the opening and closing gate;

[0036] Figure 7 It is a partial cross-sectional view of the liquid passing area;

[0037] Figure 8 A partial cross-sectional view of the drive mechanism.

[0038] Reference numerals: 1, sewage treatment tank; 11, first reaction tank; 111, first liquid inlet; 12, second reaction tank; 121, second liquid inlet; 13, partition; 131, liquid outlet; 132, sealing gasket; 14, first liquid outlet; 15, first mud outlet; 16, second liquid outlet; 17, third liquid outlet; 18, second mud outlet; 2, U-shaped tube; 21, vertical section; 22, horizontal section; 3, first agitator; 4, second agitator; 5, driving mechanism; 51, motor; 52. Guide shaft; 53. Screw; 54. Connector; 6. Gate; 61. Connecting rib; 62. Threaded sleeve; 63. Sliding sleeve; 7. Liquid flow area; 71. Baffle; 72. Liquid inlet head; 73. Side port; 74. Through hole; 75. Side cavity; 76. Confluence cavity; 77. Guide rib; 78. Diversion cavity; 79. Outlet; 8. pH detector; 9. ORP detector; 100. Collection tank; 200. Chemical tank; 300. Inspection tank; 400. Sludge tank; 500. Filter press. DETAILED DESCRIPTION

[0039] 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.

[0040] like Figures 1 to 8As shown, this embodiment discloses a sewage treatment device, including a collection tank 100, a sewage treatment tank 1, multiple chemical tanks 200, a testing tank 300, a sludge tank 400 and a filter press 500. The sewage generated during the production of products such as laser film and cold stamping film is discharged into the collection tank 100 for collection, and each chemical tank 200 stores different chemicals.

[0041] like Figure 4 As shown, the sewage treatment tank 1 is provided with a first reaction tank 11 and a second reaction tank 12. After the sewage reacts in the first reaction tank 11 and the second reaction tank 12, precipitates will be generated. The first reaction tank 11 and the second reaction tank 12 are separated by a partition 13. A liquid outlet 131 is provided in the partition 13. The liquid outlet 131 can be opened or closed by an opening and closing gate to connect or block the first reaction tank 11 and the second reaction tank 12. By setting the liquid outlet 131, the supernatant (the liquid located in the liquid level h1-h2) in the sewage treated in the first reaction tank 11 can be discharged into the second reaction tank 12 for treatment, and by setting the opening and closing gate, the first reaction tank 11 or the second reaction tank 12 can be prevented from interfering with each other when treating sewage.

[0042] like Figure 1 、 Figure 2 and Figure 4 As shown, the first reaction tank 11 includes a first liquid inlet 111, a first liquid outlet 14 and a first mud outlet 15 arranged from high to low, and the collection tank 100 is connected to the first liquid inlet 111 and the first liquid outlet 14 respectively through pipes; the first mud outlet 15 is connected to the sludge tank 400 through a pipe;

[0043] The wastewater in the collection tank 100 is transported from the first liquid inlet end 111 to the first reaction tank 11 through the lifting pump. After the sewage in the first reaction tank 11 is treated, the middle layer liquid (liquid located at the liquid level h2-h3) is discharged from the first liquid outlet 14 through the lifting pump into the collection tank 100 for collection, and the bottom layer liquid (mud liquid located below the liquid level h3) is discharged from the first mud discharge port 15 through the sludge pump into the sludge tank 400 for collection; by sending the supernatant liquid to the second reaction tank 12 for reaction, the middle layer liquid is sent back to the collection tank 100 for re-reaction, and the bottom layer liquid is sent to the sludge tank 400 for collection, thereby realizing the classified collection of the liquid after the first reaction in the first reaction tank 11, which can effectively improve the sewage treatment effect.

[0044] The second reaction tank 12 includes a second liquid inlet 121, a second liquid outlet 16, a third liquid outlet 17, and a second mud outlet 18 arranged from high to low. The inspection tank 300 is connected to the second liquid inlet 121 and the second liquid outlet 16 through pipes, respectively. The second mud outlet 18 is also connected to the sludge tank 400 through a pipe. The first liquid outlet 14 is connected to the third liquid outlet 17 through a U-shaped pipe 2.

[0045] When the level of the supernatant discharged from the first reaction tank 11 into the second reaction tank 12 reaches h4, the sewage in the second reaction tank 12 is reacted again. After the reaction is completed, the supernatant in the second reaction tank 11 (the liquid between the liquid levels h4-h5) is discharged into the inspection tank 300 from the second liquid outlet 16 through the lifting pump. When the sewage treatment is completed, if the liquid in the inspection tank 300 passes the inspection, it is discharged into the municipal sewage pipeline. If it fails, it is discharged into the second reaction tank 12 through the pipeline from the second liquid inlet end 121 for further treatment, thereby ensuring that the liquid in the inspection tank 300 can meet the discharge standards. The middle layer liquid (the liquid between the liquid levels h5-h6) enters the first reaction tank 11 again through the U-shaped tube 2 for reaction, and the bottom layer liquid (the mud liquid below the liquid level h6) is discharged into the sludge tank 400 from the second mud discharge port 18 through the sludge pump for collection.

[0046] By setting up a collection tank 100, a first reaction tank 11, a second reaction tank 12, a test tank 300 and a sludge tank 400, sewage treatment can be achieved. After each sewage treatment, the liquid in the first reaction tank 11 and the second reaction tank 12 can be emptied, and the liquid at different positions can be transported to the corresponding area through pipes for collection, which can greatly improve the sewage treatment effect.

[0047] Among them, the first reaction tank 11 and the second reaction tank 12 are respectively connected to the corresponding reagent tank 200 through pipes. During the treatment of sewage, corresponding reagents need to be added to the first reaction tank 11 and the second reaction tank 12 to ensure the treatment effect of the sewage. By setting up multiple reagent tanks 200, different required reagents can be stored separately to achieve the purpose of separate dosing.

[0048] The sludge tank 400 is connected to the collection tank 100 and the filter press 500 by pipelines respectively. When the mud liquid in the first reaction tank 11 and the second reaction tank 12 is transported to the sludge tank 400 for secondary precipitation, the upper liquid in the sludge tank 400 can be transported to the collection tank 100 for further treatment through the lifting pump, and the sludge in the sludge tank 400 is transported to the filter press 500 for filtration operation through the sludge pump. The filter press 500 is connected to the collection tank 100 through a pipeline. The liquid generated during the filtration process of the filter press 500 is then transported back to the collection tank 100 for collection through the lifting pump, and the sludge can be hydraulically filtered into a mud cake by the filter press 500, which is convenient for sludge collection. Among them, the filter press 500 is an existing technology, and its specific structure is not described in detail in this specification. It can be seen that this embodiment can treat sewage in a closed loop, and the sewage becomes dischargeable water and mud cake after treatment, which effectively solves the current sewage treatment problem of enterprises.

[0049] Among them, such as Figure 1 As shown, the two vertical sections 21 of the U-shaped tube 2 are respectively connected to the first liquid outlet 14 and the third liquid outlet 17, and the two ends of the horizontal section 22 of the U-shaped tube 2 are respectively connected to the upper ends of the two vertical sections 21, and the position of the horizontal section 22 is higher than the height of the liquid level h1 of the first reaction tank 11. A water pump is connected to the horizontal section 22, and the height of the water pump is also higher than the liquid level h1. By arranging a water pump at the horizontal section 22, the middle layer liquid in the second reaction tank 12 can be discharged into the first reaction tank 11, and because the position of the horizontal section 22 is higher than the liquid level h1, it can avoid the first reaction tank 11 and the second reaction tank 12 from being connected through the U-shaped tube 2 when treating sewage, and can also prevent the water pump from contacting with sewage when not working, thereby effectively improving the service life of the water pump there.

[0050] like Figure 4 As shown, a first agitator 3 is provided inside the first reaction tank 11, and a second agitator 4 is provided inside the second reaction tank 12. A pH detector 8 is installed in both the first reaction tank 11 and the second reaction tank 12, and an ORP detector 9 is installed in the first reaction tank 11. By arranging the first agitator 3 and the second agitator 4, the sewage in the first reaction tank 11 and the second reaction tank 12 can be stirred respectively, which is convenient for sewage treatment. By arranging the pH detector 8 and the ORP detector 9, the water quality of the corresponding sewage can be detected.

[0051] like Figures 4 to 6 、 Figure 8 As shown, the opening and closing gate includes a driving mechanism 5 and a gate plate 6. Specifically, the driving mechanism 5 includes two sets of driving units, the driving units are located on both sides of the gate plate 6, and the driving units include a motor 51, a guide shaft 52 and a screw 53. The lower end of the guide shaft 52 is fixed to the bottom of the sewage treatment tank 1 and the upper end is movably connected to the lower end of the screw 53. The upper end of the screw 53 is connected to the motor 51. A connector 54 is fixed to the upper end of the guide shaft 52. The connector 54 is fixed to the inner wall of the first reaction tank 11. The lower end of the screw 53 is inserted into the connector 54 and is connected to the guide shaft 52 through a bearing. The position 54 is higher than the liquid level of the first reaction tank 11. The guide shaft 52 and the screw 53 are connected by a bearing, so that the guide shaft 52 can be fixed in the first reaction tank 11, and the motor 51 can drive the screw 53 to rotate. By setting the connector 54, the connection between the upper end of the guide shaft 52, the lower end of the screw 53 and the inner wall of the first reaction tank 11 can be achieved, which is beneficial to improving the fixing effect of the driving mechanism 5, and the connector 54 and the above part are not immersed in the sewage in the first reaction tank 11, which can effectively reduce the impact of sewage on the connector 54, bearings, and screw 53, thereby helping to improve the service life of the driving mechanism 5.

[0052] The driving mechanism 5 can drive the gate plate 6 to move up and down so that the gate plate 6 covers the liquid port 131 or opens the liquid port 131. Specifically, the gate plate 6 is connected to the screw 53 and the guide shaft 52 respectively. Connecting ribs 61 are provided at both ends of the upper part of the gate plate 6. The upper end of the connecting rib 61 is provided with a threaded sleeve 62. The two threaded sleeves 62 are respectively threadedly connected to the two screws 53. Slide sleeves 63 are provided at both ends of the lower part of the gate plate 6. The slide sleeves 63 are sleeved on the outside of the corresponding guide shaft 52. When the motor 51 is working, it can drive the screw 53 to rotate. Through the cooperation of the threaded sleeve 62 and the screw 53 and the cooperation of the slide sleeve 63 and the guide shaft 52, the gate plate 6 can be lifted up and down, and the liquid port 131 can be opened or closed. It is easy to operate and has good reliability.

[0053] In addition, a sealing gasket 132 is fixed to the peripheral side of the liquid outlet 131 facing the first reaction tank 11, and the side surface of the gate plate 6 abuts against the sealing gasket 132. The sealing gasket 132 can play a sealing role.

[0054] like Figure 7 As shown, the gate 6 includes a liquid flow area 7 located at the upper part thereof, a plurality of baffles 71 are provided in the liquid flow area 7, a liquid flow unit is provided between two adjacent baffles 71, the liquid flow unit includes a liquid inlet head 72 and an outlet 79, side cavities 75 are provided between the baffles 71 on both sides of the liquid inlet head 72, side ports 73 are provided on both sides of the liquid inlet head 72, a through hole 74 is provided on the side of the liquid inlet head 72 facing the second reaction tank 12, the side ports 73, the side cavities 75, the through hole 74 and the outlet 79 are connected, the liquid flow unit also includes a diversion chamber 78, guide ribs 77 are provided on both sides of the baffle 71, the outlet 79 is opposite to the guide rib 77, the diversion chamber 78 is connected to the confluence chamber 76 and is divided by the guide rib 77.

[0055] The opening of the liquid passage port 131 is very large, which can achieve rapid liquid passage and improve the sewage treatment efficiency. However, due to the large opening, the liquid passage flow rate is too fast, which will also bring too much of the middle layer liquid in the first reaction tank 11 into the second reaction tank 12. Therefore, by setting the liquid passage area 7, it is possible to achieve rapid liquid passage while playing a slow flow role, thereby preventing too much of the middle layer liquid in the first reaction tank 11 from entering the second reaction tank 12. Specifically, when the liquid passage port 131 is opened, the first reaction tank 1 Part of the liquid in 1 enters the side cavity 75 from the side port 73, and after being buffered and diverted by the baffle 71, enters the confluence cavity 76 from both sides of the liquid inlet head 72. The other part of the liquid directly passes through the through hole 74 and enters the confluence cavity 76. The two parts of the liquid are gathered in the confluence cavity 76 and then flow slowly again. The liquid in the confluence cavity 76 enters the diversion cavity 78 and then flows slowly from the outlets 79 on both sides into the second reaction tank 12, thereby preventing too much middle layer liquid in the first reaction tank 11 from being brought into the second reaction tank 12.

[0056] A sewage treatment method of the present invention comprises the following steps:

[0057] S1. Pump the sewage in the collection tank 100 into the first reaction tank 11 through a water pump until the liquid level reaches h1, and start the first agitator 3;

[0058] S2, adding hydrochloric acid in the corresponding reagent pool 200 into the first reaction pool 11, until the pH value detector 8 detects that the pH value is between 2 and 3;

[0059] S3. Add the reducing agent in the corresponding reagent tank 200 into the first reaction tank 11 until the instrument reading of the ORP detector 9 is between 230MV and 270MV, and react for 10 minutes; the reducing agent is ferrous sulfate, and the hexavalent chromium in the wastewater is reduced to trivalent chromium by the reducing agent;

[0060] S4, adding sodium hydroxide in the corresponding reagent pool 200 into the first reaction pool 11, until the pH value detector 8 detects that the pH value is 11;

[0061] S5, turn off the first agitator 3 and let it settle for 1 hour;

[0062] S6. The liquid in the first reaction tank 11 is discharged. The motor 51 drives the gate 6 to move slowly downward. The liquid between the liquid levels h1 and h2 enters the second reaction tank 12 through the liquid outlet 131. The liquid between the liquid levels h2 and h3 enters the collection tank 100 again through the first liquid outlet 14. The mud below the liquid level h3 enters the sludge tank 400 through the first mud discharge port 15.

[0063] S7, repeating steps S1 to S6 until the liquid level in the second reaction tank 12 reaches h4, and closing the liquid outlet 131;

[0064] S8, turn on the second agitator 4, and add the ferrous sulfate and hydrochloric acid in the corresponding reagent pool 200 into the second reaction pool 12, until the pH detector 8 detects that the pH value is 8-8.5;

[0065] S9, adding PAC and PAM in the corresponding reagent pool 200 into the second reaction pool 12, and turning off the second agitator 4, and settling for 2 hours; adding PAC and PAM causes the pollutants in the sewage to form large particle flocs and precipitate. This reaction method is the existing technology;

[0066] S10. Drain the liquid in the second reaction tank 12. The liquid between the liquid levels h4 and h5 is discharged from the second liquid outlet 16 into the inspection tank 300. Qualified liquid is discharged from the inspection tank 300 into the municipal sewage pipeline. The liquid between the liquid levels h5 and h6 is discharged from the first liquid outlet 14 into the first reaction tank 11 through the U-shaped pipe 2. The liquid below the liquid level h6 is discharged from the second sludge outlet 18 into the sludge tank 400.

[0067] S11. The sludge in the sludge tank 400 is discharged into the filter press 500 for filtration, and the sludge and liquid are separated by the filter press 500. The separated liquid is then transported back to the collection tank 100 through a pipeline.

[0068] S12. Complete sewage treatment.

[0069] After the sewage treatment is completed, the staff will test the liquid in the test tank 300. If it is qualified, it will be discharged. If it is unqualified, it will enter the second reaction tank 12 again for reaction until the sewage meets the discharge standard.

[0070] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiment. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, various improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A sewage treatment device, characterized in that: It includes a collection tank (100), a sewage treatment tank (1), a plurality of reagent tanks (200), a testing tank (300), a sludge tank (400) and a filter press (500); The sewage treatment tank (1) is provided with a first reaction tank (11) and a second reaction tank (12), the first reaction tank (11) and the second reaction tank (12) are separated by a partition (13), the partition (13) is provided with a liquid outlet (131), and the liquid outlet (131) can be opened or closed by an opening and closing gate to connect or block the first reaction tank (11) and the second reaction tank (12); The first reaction tank (11) comprises a first liquid inlet (111), a first liquid outlet (14) and a first mud outlet (15) arranged from high to low, the collecting tank (100) is connected to the first liquid inlet (111) and the first liquid outlet (14) through pipelines, the second reaction tank (12) comprises a second liquid inlet (121), a second liquid outlet (16), a third liquid outlet (17) and a second mud outlet (18) arranged from high to low, the inspection tank (300) is connected to the second liquid inlet (121) and the first liquid outlet (14) through pipelines, The liquid end (121) and the second liquid outlet (16) are connected via a pipeline, the first reaction tank (11) and the second reaction tank (12) are respectively connected to the corresponding reagent tank (200) via a pipeline, the first mud discharge port (15) and the second mud discharge port (18) are respectively connected to the sludge tank (400) via a pipeline, the sludge tank (400) is respectively connected to the collection tank (100) and the filter press (500) via a pipeline, and the filter press (500) is connected to the collection tank (100) via a pipeline; The opening and closing gate comprises a driving mechanism (5) and a gate plate (6). The driving mechanism (5) can drive the gate plate (6) to move up and down so that the gate plate (6) covers the liquid outlet (131) or opens the liquid outlet (131). The gate plate (6) comprises a liquid outlet area (7) located at its upper portion. A plurality of baffles (71) are provided in the liquid outlet area (7). A liquid outlet unit is provided between two adjacent baffles (71). The liquid outlet unit comprises a liquid inlet head (72) and an outlet (79). Side cavities (75) are provided between the two sides of the liquid inlet head (72) and the baffles (71). Side ports (73) are provided on both sides of the liquid inlet head (72). A through hole (74) is provided on the side of the liquid inlet head (72) facing the second reaction tank (12). The side ports (73), the side cavities (75), the through hole (74) and the outlet (79) are connected. The first liquid outlet (14) and the third liquid outlet (17) are connected via a U-shaped tube (2); the two vertical sections (21) of the U-shaped tube (2) are respectively connected to the first liquid outlet (14) and the third liquid outlet (17); the two ends of the horizontal section (22) of the U-shaped tube (2) are respectively connected to the upper ends of the two vertical sections (21); the position of the horizontal section (22) is higher than the liquid level of the first reaction tank (11); and a water pump is connected to the horizontal section (22); The liquid passing unit further includes a diversion chamber (78), guide ribs (77) are provided on both sides of the baffle (71), the outlet (79) is directly opposite the guide ribs (77), and the diversion chamber (78) is communicated with the confluence chamber (76) and is divided by the guide ribs (77).

2. A sewage treatment device according to claim 1, characterized in that: The driving mechanism (5) includes two groups of driving units, the driving units are located on both sides of the gate plate (6), and the driving units include a motor (51), a guide shaft (52) and a screw (53). The lower end of the guide shaft (52) is fixed to the bottom of the sewage treatment tank (1) and the upper end is movably connected to the lower end of the screw (53). The upper end of the screw (53) is connected to the motor (51), and the gate plate (6) is connected to the screw (53) and the guide shaft (52) respectively.

3. A sewage treatment device according to claim 2, characterized in that: Connecting ribs (61) are provided at both ends of the upper portion of the gate plate (6), and threaded sleeves (62) are provided at the upper ends of the connecting ribs (61). The two threaded sleeves (62) are respectively threadedly connected to the two screw rods (53). Sliding sleeves (63) are provided at both ends of the lower portion of the gate plate (6), and the sliding sleeves (63) are sleeved on the outer sides of the corresponding guide shafts (52).

4. A sewage treatment device according to claim 2, characterized in that: A connector (54) is fixed to the upper end of the guide shaft (52), and the connector (54) is fixed to the inner wall of the first reaction tank (11). The lower end of the screw (53) is inserted into the connector (54) and connected to the guide shaft (52) through a bearing. The position of the connector (54) is higher than the liquid level of the first reaction tank (11).

5. A sewage treatment device according to claim 1, characterized in that: A sealing gasket (132) is fixed to the peripheral side of the liquid outlet (131) toward the first reaction tank (11), and the side of the gate plate (6) abuts against the sealing gasket (132). A first agitator (3) is provided inside the first reaction tank (11), and a second agitator (4) is provided inside the second reaction tank (12). A pH detector (8) is installed in both the first reaction tank (11) and the second reaction tank (12), and an ORP detector (9) is installed in the first reaction tank (11).

6. A sewage treatment method, using a sewage treatment device according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1, pumping the sewage in the collection tank (100) into the first reaction tank (11) through a water pump until the liquid level reaches h1, and turning on the first agitator (3); S2, adding hydrochloric acid in the corresponding reagent pool (200) into the first reaction pool (11), until the pH value detector (8) detects that the pH value is between 2 and 3; S3, adding the reducing agent in the corresponding reagent pool (200) into the first reaction pool (11), until the instrument reading of the ORP detector (9) is between 230MV-270MV, and reacting for 10 minutes; S4, adding sodium hydroxide in the corresponding reagent pool (200) into the first reaction pool (11) until the pH value detector (8) detects that the pH value is 11; S5, turn off the first agitator (3) and let it settle for 1 hour; S6, draining the liquid in the first reaction tank (11), the motor (51) drives the gate (6) to move slowly downward, the liquid between the liquid level h1 and h2 enters the second reaction tank (12) through the liquid outlet (131), the liquid between the liquid level h2 and h3 enters the collection tank (100) again through the first liquid outlet (14), and the mud liquid below the liquid level h3 enters the sludge tank (400) through the first mud discharge port (15); S7, repeating steps S1 to S6 until the liquid level in the second reaction tank (12) reaches h4, and closing the liquid outlet (131); S8, turning on the second agitator (4), and adding ferrous sulfate and hydrochloric acid in the corresponding reagent pool (200) into the second reaction pool (12), until the pH detector (8) detects that the pH value is 8-8.5; S9, adding PAC and PAM in the corresponding reagent pool (200) into the second reaction pool (12), and turning off the second agitator (4), and settling for 2 hours; S10, draining the liquid in the second reaction tank (12), discharging the liquid between the liquid level h4 and h5 from the second liquid outlet (16) into the inspection tank (300), and discharging the qualified liquid from the inspection tank (300) into the municipal sewage pipeline, discharging the liquid between the liquid level h5 and h6 from the first liquid outlet (14) into the first reaction tank (11) through the U-shaped pipe (2), and discharging the liquid below the liquid level h6 from the second sludge outlet (18) into the sludge tank (400); S11, the sludge in the sludge tank (400) is discharged into the filter press (500) for filtration, the sludge and liquid are separated by the filter press (500), and the separated liquid is transported back to the collection tank (100) through a pipeline; S12, complete sewage treatment; The height of the liquid level h1 is higher than the lower edge of the liquid outlet (131), the height of the liquid level h2 is lower than the height of the liquid level h1 and is located at the lower edge of the liquid outlet (131), the height of the liquid level h3 is lower than the height of the liquid level h2, the height of the liquid level h4 is between the liquid levels h1 and h2, the height of the liquid level h5 is lower than the height of the liquid level h4, and the height of the liquid level h6 is lower than the height of the liquid level h5.

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