A sewage treatment device and sewage treatment method for sodium nitrite production

Abstract

The present invention relates to the technical field of sewage treatment, and discloses a sewage treatment device and a sewage treatment method for sodium nitrite production, comprising a filter box, a water inlet hose is arranged on one side of the top of the filter box, an input pipe is arranged on the other side of the top of the filter box, an output pipe is arranged directly below the input pipe, and corrosion-resistant telescopic pipes are arranged on the input pipe and the output pipe, the filter box is cylindrical, and a partition plate is sealed and rotatably connected in the middle of the filter box. The present invention can preliminarily treat sewage through the fan-shaped filter area on the semicircular plate, filter solid impurity particles in the sewage, and can automatically replace the semicircular plate after a period of time, and clean the fan-shaped filter area on the replaced semicircular plate, remove the solid impurity particles on the surface of the fan-shaped filter area, no manual replacement and cleaning are required, greatly improve the efficiency of sewage treatment, and have high safety.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and in particular to a sewage treatment device and a sewage treatment method for sodium nitrite production. Background Art

[0002] Sodium nitrite is an inorganic compound, a white crystalline powder, easily soluble in water, slightly soluble in ethanol, methanol, and ether. It is mainly used to make azo dyes, and can also be used as a mordant for fabric dyeing, a bleaching agent, and a metal heat treatment agent.

[0003] During the production process of sodium nitrite, wastewater will be generated. The wastewater will contain a large amount of solid impurity particles as well as substances such as nitrite and nitrate, which are harmful to the human body and the environment. Therefore, the wastewater needs to be treated before it is discharged. The existing treatment methods basically first perform preliminary filtration treatment on the wastewater to prepare for subsequent biological or chemical treatment. During the filtration process, solid impurity particles will be filtered out. If they are not cleaned, the filtration effect will be affected.

[0004] In view of this, the present invention proposes a sewage treatment device and a sewage treatment method for sodium nitrite production to solve the problems existing in the above-mentioned prior art. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a sewage treatment device and a sewage treatment method for sodium nitrite production.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A sewage treatment device for sodium nitrite production, comprising a filter box, a water inlet hose is arranged on one side of the top of the filter box, an input pipe is arranged on the other side of the top of the filter box, an output pipe is arranged directly below the input pipe, and corrosion-resistant telescopic pipes are arranged on the input pipe and the output pipe, the filter box is cylindrical, and a partition plate is sealed and rotatably connected to the middle of the filter box, the axis of the partition plate coincides with the axis of the cylindrical filter box, and semicircular plates are fixedly connected to the outer walls of both sides of the partition plate, the semicircular plates are sealed and slidably connected to the inner wall of the filter box, and the semicircular plates are provided A fan-shaped filtering area is provided, a rotating mechanism is provided on the top of the partition plate, a circular groove is provided on the top of the filter box, and an arc-shaped groove 1 is provided on one side of the bottom of the circular groove, an arc-shaped groove 2 connected to the arc-shaped groove 1 is provided on one side of the inside of the filter box, and a slider is connected to the inner wall of the arc-shaped groove 2, and one side of the slider is slidably connected to the inner wall of the arc-shaped groove 1, a fixed plate is fixedly connected to the other side of the slider, and a roller cleaning brush is rotatably connected to the outer wall of the fixed plate, a driving mechanism is provided on the top of the slider, a through port is provided directly below the arc-shaped groove 1, and a sewage pipe is provided on one side of the through port.

[0008] Furthermore, the rotating mechanism includes a rotating shaft, the rotating shaft is sealingly rotatably connected to the middle of the filter box, and the bottom end of the rotating shaft is fixedly connected to the top of the partition plate, a mounting frame is arranged above the top of the rotating shaft, and a rotating motor three is arranged on the top of the mounting frame, and the rotating motor three is connected to the rotating shaft through a coupling.

[0009] Furthermore, the driving mechanism includes a second rotating motor, which is fixedly connected to the outer wall of the filter box, and the output shaft end of the second rotating motor is fixedly connected to a driving plate, a sliding groove is provided on the driving plate, and a driving column is slidably connected to the inner wall of the sliding groove.

[0010] Furthermore, a driving turntable is fixedly connected to the bottom outer wall of the driving column, and the driving turntable is sealingly rotatably connected in the circular groove, and a connecting column is fixedly connected between the bottom outer wall of the driving turntable and the top outer wall of the slider.

[0011] Furthermore, a support frame is arranged directly below the filter box, and the outer walls at both ends of the filter box are rotatably connected with rotating columns, the rotating columns are rotatably connected to the inner wall of the support frame, and a rotating motor is arranged at one end of one of the rotating columns.

[0012] Furthermore, an accommodating cavity is arranged directly below the through opening, and a sealing baffle is sealingly and slidably connected at the connection between the accommodating cavity and the through opening, and the sealing baffle can seal the through opening.

[0013] Furthermore, a magnetic plate is fixedly connected to the bottom end of the sealing baffle, an electromagnet is provided on the inner wall of the bottom of the accommodating cavity, and a supporting spring is fixedly connected between the electromagnet and the magnetic plate. The magnetic force generated by the electromagnet after power is supplied attracts the magnetic plate.

[0014] Furthermore, a semicircular cavity is provided below the roller cleaning brush, and two electric push rods are inlaid at the bottom of the semicircular cavity, the telescopic ends of the two electric push rods are fixedly connected with semicircular push plates, and the semicircular push plates are sealingly and slidingly connected to the semicircular cavity, and the semicircular push plates are also sealingly and slidingly connected to the inner wall of the filter box and the outer wall of the partition plate.

[0015] A method for treating wastewater in a wastewater treatment device for sodium nitrite production, specifically comprising the following steps:

[0016] S1. The wastewater generated during the production of sodium nitrite enters the filter box through the input pipe. The solid impurity particles contained in the wastewater can be filtered out by the fan-shaped filter area in the semicircular plate below the input pipe. Then the filtered wastewater flows out through the output pipe to prepare for subsequent treatment;

[0017] S2. After filtering for a period of time, stop inputting sewage into the filter box, then the rotating mechanism rotates the partition plate 180 degrees, so that another semicircular plate is replaced between the input pipe and the output pipe, and then the input pipe continues to input sewage into the filter box, and at the same time, clean water flows out of the water inlet hose into the space where the replaced semicircular plate is located, and the opening is sealed by the sealing baffle;

[0018] S3, then the driving mechanism moves the roller cleaning brush, and at the same time the electric push rod moves the semicircular push plate up and down, so as to clean the fan-shaped filter area in the replaced semicircular plate and remove the solid impurity particles filtered out from the fan-shaped filter area.

[0019] The beneficial effects of the present invention are:

[0020] 1. The present invention can perform preliminary treatment on sewage through the fan-shaped filter area on the semicircular plate, filter out solid impurity particles in the sewage, and can automatically replace the semicircular plate after a period of time, and clean the fan-shaped filter area on the replaced semicircular plate to remove the solid impurity particles on the surface of the fan-shaped filter area. There is no need for manual replacement and cleaning, which greatly improves the efficiency of sewage treatment and has high safety.

[0021] 2. By providing a rotating motor and a rotating column, the filter box can be tilted, thereby facilitating the discharge of clean sewage used to clean the fan-shaped filter area and avoiding residual clean sewage.

[0022] 3. By setting a sealing baffle, when cleaning the fan-shaped filter area on the replaced semicircular plate, the opening can be sealed by the sealing baffle to avoid the waste of cleaning water caused by the outflow of cleaning water through the sewage pipe during cleaning.

[0023] 4. During the cleaning process of the fan-shaped filter area, the semicircular push plate is moved up and down reciprocatingly by the electric push rod. During the reciprocating movement of the semicircular plate up and down, the clean water can be squeezed, so that the clean water can reciprocately flush the fan-shaped filter area, greatly improving the cleaning efficiency and effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the structure of a sewage treatment device for sodium nitrite production proposed in Example 1;

[0025] Figure 2 This is a schematic diagram of the internal structure of a filter box of a wastewater treatment device for sodium nitrite production proposed in Example 1;

[0026] Figure 3 This is a schematic diagram of the filter box structure of a sewage treatment device for sodium nitrite production proposed in Example 1;

[0027] Figure 4This is a schematic diagram of the structure of a driving turntable of a sewage treatment device for sodium nitrite production proposed in Example 1;

[0028] Figure 5 This is a schematic diagram of the cross-sectional structure of a sewage treatment device for sodium nitrite production proposed in Example 2;

[0029] Figure 6 This is a schematic diagram of the cross-sectional structure of a filter box of a sewage treatment device for sodium nitrite production proposed in Example 3.

[0030] In the figure: 1, support frame; 2, rotating motor one; 3, filter box; 4, rotating motor two; 5, drain pipe; 6, drive plate; 7, mounting frame; 8, rotating motor three; 9, water inlet hose; 10, input pipe; 11, output pipe; 12, corrosion-resistant telescopic tube; 13, rotating column; 14, semicircular plate; 15, fan-shaped filter area; 16, through port; 17, roller cleaning brush; 18, driving turntable; 19, partition plate; 20, rotating shaft; 21, arc groove one; 22, arc groove two; 23, slider; 24, connecting column; 25, fixed plate; 26, circular groove; 27, sliding groove; 28, driving column; 29, electromagnet; 30, supporting spring; 31, sealing baffle; 32, magnetic plate; 33, accommodating cavity; 34, electric push rod; 35, semicircular cavity; 36, semicircular push plate. DETAILED DESCRIPTION

[0031] The technical solution of the present invention is further described in detail below in conjunction with specific implementation methods.

[0032] Example 1: Reference Figure 1-Figure 4A sewage treatment device for sodium nitrite production includes a filter box 3, a water inlet hose 9 is arranged on one side of the top of the filter box 3, and an input pipe 10 is arranged on the other side of the top of the filter box 3, an output pipe 11 is arranged directly below the input pipe 10, and the input pipe 10 and the output pipe 11 are both provided with corrosion-resistant telescopic pipes 12, the filter box 3 is cylindrical, and a partition plate 19 is sealed and rotatably connected to the middle of the filter box 3, the axis of the partition plate 19 coincides with the axis of the cylindrical filter box 3, and the outer walls on both sides of the partition plate 19 are fixedly connected with semicircular plates 14, and the semicircular plates 1 4 is sealed and slidably connected with the inner wall of the filter box 3, and the semicircular plates 14 are all provided with fan-shaped filtering areas 15, the top of the partition plate 19 is provided with a rotating mechanism, the top of the filter box 3 is provided with a circular groove 26, and one side of the bottom of the circular groove 26 is provided with an arc groove 1 21, one side of the inside of the filter box 3 is provided with an arc groove 22 connected with the arc groove 1 21, and the inner wall of the arc groove 22 is connected with a slider 23, and one side of the slider 23 is slidably connected with the inner wall of the arc groove 1 21, and the other side of the slider 23 is fixedly connected with a fixed plate 25, and the outer wall of the fixed plate 25 is rotatably connected with a roller The cylinder cleaning brush 17 and the top of the slider 23 are provided with a driving mechanism. A through port 16 is provided just below the arc groove 11, and a sewage pipe 5 is provided on one side of the through port 16. The sewage generated during the production of sodium nitrite enters the filter box 3 through the input pipe 10. The solid impurity particles contained in the sewage can be filtered out by the fan-shaped filtering area 15 in the semicircular plate 14 below the input pipe 10, and then the filtered sewage flows out through the output pipe 11 to prepare for subsequent treatment. After filtering for a period of time, stop inputting sewage into the filter box 3, and then rotate the mechanism to separate The plate 19 rotates one hundred and eighty degrees, so that the other semicircular plate 14 is replaced between the input pipe 10 and the output pipe 11. Then the input pipe 10 continues to input sewage into the filter box 3. At the same time, clean water flows out of the water inlet hose 9 and enters the space where the replaced semicircular plate 14 is located. Then the driving mechanism moves the roller cleaning brush 17 to clean the fan-shaped filter area 15 in the replaced semicircular plate 14 and remove the solid impurity particles filtered out from the fan-shaped filter area 15. There is no need for manual replacement and cleaning, which greatly improves the efficiency of sewage treatment and has high safety.

[0033] As a further solution in the present invention, the rotating mechanism includes a rotating shaft 20, which is sealed and rotatably connected to the middle of the filter box 3, and the bottom end of the rotating shaft 20 is fixedly connected to the top of the partition plate 19, a mounting frame 7 is arranged above the top of the rotating shaft 20, and a rotating motor three 8 is arranged on the top of the mounting frame 7, and the rotating motor three 8 is connected to the rotating shaft 20 through a coupling, and the rotating motor three 8 rotates the partition plate 19 one hundred and eighty degrees through the rotating shaft 20.

[0034] As a further solution in the present invention, the driving mechanism includes a rotating motor 24, which is fixedly connected to the outer wall of the filter box 3, and the output shaft end of the rotating motor 24 is fixedly connected to a driving plate 6, a sliding groove 27 is provided on the driving plate 6, and a driving column 28 is slidably connected to the inner wall of the sliding groove 27, and the rotating motor 24 causes the driving plate 6 to swing back and forth.

[0035] As a further solution in the present invention, a driving turntable 18 is fixedly connected to the bottom outer wall of the driving column 28, and the driving turntable 18 is sealed and rotatably connected in the circular groove 26. A connecting column 24 is fixedly connected between the bottom outer wall of the driving turntable 18 and the top outer wall of the slider 23, which can enable the driving column 28 on the driving turntable 18 to slide in the sliding groove 27 in the driving plate 6, so that the driving turntable 18 can reciprocate in the arc groove 22 with the slider 23 through the connecting column 24.

[0036] As a further solution in the present invention, a support frame 1 is arranged directly below the filter box 3, and the outer walls at both ends of the filter box 3 are rotatably connected with rotating columns 13, and the rotating columns 13 are rotatably connected to the inner wall of the support frame 1, and a rotating motor 2 is arranged at one end of one of the rotating columns 13. The rotating motor 2 can tilt the filter box 3 through the rotating column 13, thereby facilitating the discharge of clean sewage used to clean the fan-shaped filter area 15 and avoiding residual clean sewage.

[0037] Working principle: The sewage generated during the production of sodium nitrite enters the filter box 3 through the input pipe 10. The solid impurity particles contained in the sewage can be filtered out by the fan-shaped filter area 15 in the semicircular plate 14 below the input pipe 10. Then the filtered sewage flows out through the output pipe 11 to prepare for subsequent treatment. After filtering for a period of time, stop inputting sewage into the filter box 3, and then the rotating motor 3 8 rotates the partition plate 19 180 degrees through the rotating shaft 20, so that the other semicircular plate 14 is replaced between the input pipe 10 and the output pipe 11. Then the input pipe 10 continues to input sewage into the filter box 3, and the water inlet soft Clean water flows out of the pipe 9 and enters the space where the replaced semicircular plate 14 is located, and then the rotating motor 24 makes the driving plate 6 swing back and forth, so that the driving column 28 on the driving turntable 18 can slide in the sliding groove 27 in the driving plate 6, so that the driving turntable 18 can reciprocate in the arc groove 22 with the slider 23 through the connecting column 24, thereby driving the roller cleaning brush 17 to move, and the fan-shaped filter area 15 in the replaced semicircular plate 14 can be cleaned to remove the solid impurity particles filtered out of the fan-shaped filter area 15, without the need for manual replacement and cleaning, which greatly improves the efficiency of sewage treatment and has high safety.

[0038] Example 2: Reference Figure 1-Figure 5, a sewage treatment device and sewage treatment method for sodium nitrite production. Compared with Example 1, on the basis of Example 1, a accommodating chamber 33 is arranged directly below the through-port 16, and a sealing baffle 31 is sealingly and slidably connected at the connection between the accommodating chamber 33 and the through-port 16. The sealing baffle 31 can seal the through-port 16. When clean water enters the space where the replaced semicircular plate 14 is located through the water inlet hose 9, the sealing baffle 31 seals the through-port 16. Therefore, when the replaced semicircular plate 14 is cleaned, the clean water in the space where it is located will not enter the sewage pipe 5 through the through-port 16, thereby avoiding waste of clean water.

[0039] As a further solution in the present invention, a magnetic plate 32 is fixedly connected to the bottom end of the sealing baffle 31, an electromagnet 29 is provided on the inner wall of the bottom of the accommodating chamber 33, and a supporting spring 30 is fixedly connected between the electromagnet 29 and the magnetic plate 32. The magnetic force generated by the electromagnet 29 after being energized is attracted to the magnetic plate 32. When the cleaning is completed, the electromagnet 29 in the accommodating chamber 33 is energized. The electromagnet 29 generates a magnetic force after being energized, and the magnetic force generated by the electromagnet 29 is attracted to the magnetic plate 32, so that the sealing baffle 31 enters the accommodating chamber 33, so that the sealing baffle 31 will not be exposed on the inner wall at the bottom of the through opening 16, so that the through opening 16 is not sealed, and then the filter box 3 is tilted by rotating the motor 2, so that the cleaning sewage of the semicircular plate 14 is discharged to the outside through the through opening 16 and the sewage pipe 5.

[0040] Working principle: when clean water enters the space where the replaced semicircular plate 14 is located through the water inlet hose 9, the sealing baffle 31 seals the through-port 16. Therefore, when the replaced semicircular plate 14 is cleaned, the clean water in the space where it is located will not enter the sewage pipe 5 through the through-port 16, thereby avoiding the waste of clean water. When the cleaning is completed, the electromagnet 29 in the accommodating chamber 33 is energized. When the electromagnet 29 is energized, it will generate magnetic force. The magnetic force generated by it is attracted to the magnetic plate 32, thereby causing the sealing baffle 31 to enter the accommodating chamber 33, so that the sealing baffle 31 will not be exposed on the inner wall at the bottom of the through-port 16, thereby the through-port 16 is not sealed. Then, the filter box 3 is tilted by rotating the motor 2, so that the cleaned sewage of the semicircular plate 14 is discharged to the outside through the through-port 16 and the sewage pipe 5.

[0041] Example 3: Reference Figure 1-Figure 6, a sewage treatment device and sewage treatment method for sodium nitrite production, compared with Example 2, on the basis of Example 2, a semicircular cavity 35 is arranged below the drum cleaning brush 17, and two electric push rods 34 are inlaid at the bottom of the semicircular cavity 35, and the telescopic ends of the two electric push rods 34 are fixedly connected with semicircular push plates 36, and the semicircular push plates 36 are sealed and slidably connected with the semicircular cavity 35, and the semicircular push plates 36 are sealed and slidably connected with the inner wall of the filter box 3 and the outer wall of the partition plate 19 at the same time. When the sealing baffle 31 seals the opening 16 to clean the semicircular plate 14, the electric push rod 34 pushes the semicircular push plate 36 to move back and forth up and down, and the semicircular push plate 36 can push the clean water above it to move during the process of reciprocating up and down movement, thereby reciprocatingly flushing the fan-shaped filter area 15 of the semicircular push plate 36, greatly improving the cleaning efficiency and effect.

[0042] A method for treating wastewater in a wastewater treatment device for sodium nitrite production, specifically comprising the following steps:

[0043] S1. The wastewater generated during the production of sodium nitrite enters the filter box 3 through the input pipe 10. The solid impurity particles contained in the wastewater can be filtered out by the fan-shaped filter area 15 in the semicircular plate 14 below the input pipe 10. Then the filtered wastewater flows out through the output pipe 11 to prepare for subsequent treatment;

[0044] S2. After filtering for a period of time, stop inputting sewage into the filter box 3, then the rotating mechanism rotates the partition plate 19 180 degrees, so that another semicircular plate 14 is replaced between the input pipe 10 and the output pipe 11, and then the input pipe 10 continues to input sewage into the filter box 3, and at the same time, clean water flows out of the water inlet hose 9 into the space where the replaced semicircular plate 14 is located, and the through port 16 is sealed by the sealing baffle 31;

[0045] S3, then the driving mechanism moves the roller cleaning brush 17, and at the same time the electric push rod 34 moves the semicircular push plate 36 up and down, so as to clean the fan-shaped filter area 15 in the replaced semicircular plate 14 and remove the solid impurity particles filtered out from the fan-shaped filter area 15.

[0046] Working principle: When the opening 16 is sealed and the semicircular plate 14 is cleaned, the electric push rod 34 pushes the semicircular push plate 36 to move back and forth. During the up and down reciprocating movement, the semicircular push plate 36 can push the clean water above it to move, thereby reciprocatingly flushing the fan-shaped filter area 15 of the semicircular push plate 36, greatly improving the cleaning efficiency and effect.

[0047] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A sewage treatment device for sodium nitrite production, comprising a filter box (3), a water inlet hose (9) being arranged on one side of the top of the filter box (3), and an input pipe (10) being arranged on the other side of the top of the filter box (3), an output pipe (11) being arranged directly below the input pipe (10), and corrosion-resistant telescopic pipes (12) being arranged on both the input pipe (10) and the output pipe (11), characterized in that: The filter box (3) is cylindrical, and a partition plate (19) is rotatably connected to the middle of the filter box (3), the axis of the partition plate (19) coincides with the axis of the cylindrical filter box (3), and semicircular plates (14) are fixedly connected to the outer walls of both sides of the partition plate (19), the semicircular plates (14) are slidably connected to the inner wall of the filter box (3), and the semicircular plates (14) are provided with fan-shaped filtering areas (15), the top of the partition plate (19) is provided with a rotating mechanism, the top of the filter box (3) is provided with a circular groove (26), and one side of the bottom of the circular groove (26) is provided with an arc-shaped groove (15). 21), an arc-shaped groove 2 (22) connected to the arc-shaped groove 1 (21) is provided on one side of the interior of the filter box (3), and a slider (23) is connected to the inner wall of the arc-shaped groove 2 (22), and one side of the slider (23) is slidably connected to the inner wall of the arc-shaped groove 1 (21), and a fixing plate (25) is fixedly connected to the other side of the slider (23), and a roller cleaning brush (17) is rotatably connected to the outer wall of the fixing plate (25), a driving mechanism is provided on the top of the slider (23), and a through port (16) is provided directly below the arc-shaped groove 1 (21), and a sewage discharge pipe (5) is provided on one side of the through port (16); An accommodating cavity (33) is provided directly below the through opening (16), and a sealing baffle (31) is sealingly and slidably connected at the connection between the accommodating cavity (33) and the through opening (16), wherein the sealing baffle (31) is capable of sealing the through opening (16); The bottom end of the sealing baffle (31) is fixedly connected to a magnetic plate (32); an electromagnet (29) is provided on the inner wall of the bottom of the accommodating cavity (33); a supporting spring (30) is fixedly connected between the electromagnet (29) and the magnetic plate (32); and the magnetic force generated by the electromagnet (29) when energized attracts the magnetic plate (32); A semicircular cavity (35) is provided below the roller cleaning brush (17), and two electric push rods (34) are embedded at the bottom of the semicircular cavity (35). The telescopic ends of the two electric push rods (34) are fixedly connected to semicircular push plates (36), and the semicircular push plates (36) are sealingly slidably connected to the semicircular cavity (35). The semicircular push plates (36) are also sealingly slidably connected to the inner wall of the filter box (3) and the outer wall of the partition plate (19).

2. A sewage treatment plant for sodium nitrite production according to claim 1, characterized in that: The rotating mechanism comprises a rotating shaft (20), the rotating shaft (20) being sealingly rotatably connected to the middle of the filter box (3), and the bottom end of the rotating shaft (20) being fixedly connected to the top of the partition plate (19), a mounting frame (7) being arranged above the top end of the rotating shaft (20), and a rotating motor three (8) being arranged on the top of the mounting frame (7), and the rotating motor three (8) being connected to the rotating shaft (20) via a coupling.

3. A sewage treatment plant for sodium nitrite production according to claim 2, characterized in that: The driving mechanism comprises a second rotating motor (4), the second rotating motor (4) being fixedly connected to the outer wall of the filter box (3), and a driving plate (6) being fixedly connected to the output shaft end of the second rotating motor (4), a sliding groove (27) being provided on the driving plate (6), and a driving column (28) being slidably connected to the inner wall of the sliding groove (27).

4. A sewage treatment plant for sodium nitrite production according to claim 3, characterized in that: The bottom outer wall of the driving column (28) is fixedly connected to a driving rotary disk (18), and the driving rotary disk (18) is sealingly rotatably connected to the circular groove (26). A connecting column (24) is fixedly connected between the bottom outer wall of the driving rotary disk (18) and the top outer wall of the sliding block (23).

5. A sewage treatment device for sodium nitrite production according to claim 1, characterized in that: A support frame (1) is arranged directly below the filter box (3), and the outer walls at both ends of the filter box (3) are rotatably connected to rotating columns (13), the rotating columns (13) are rotatably connected to the inner wall of the support frame (1), and a rotating motor (2) is arranged at one end of one of the rotating columns (13).

6. A method for treating sewage according to any one of claims 1 to 5, wherein the method comprises: The specific steps include: S1. The wastewater generated during the production of sodium nitrite enters the filter box (3) through the input pipe (10). Solid impurity particles contained in the wastewater can be filtered out by the fan-shaped filter area (15) in the semicircular plate (14) below the input pipe (10). Then, the filtered wastewater flows out through the output pipe (11) to prepare for subsequent treatment. S2, after filtering for a period of time, the input of sewage into the filter box (3) is stopped, and then the rotating mechanism rotates the partition plate (19) 180 degrees, so that another semicircular plate (14) is replaced between the input pipe (10) and the output pipe (11), and then the input pipe (10) continues to input sewage into the filter box (3), and at the same time, clean water flows out of the water inlet hose (9) into the space where the replaced semicircular plate (14) is located, and the opening (16) is sealed by the sealing baffle (31); S3, the driving mechanism then moves the roller cleaning brush (17), and at the same time the electric push rod (34) moves the semicircular push plate (36) up and down, thereby cleaning the fan-shaped filter area (15) in the replaced semicircular plate (14) and removing the solid impurity particles filtered out of the fan-shaped filter area (15).

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