A device and operation method supporting switching of multiple water treatment methods

Abstract

The present invention belongs to the technical field of sewage treatment equipment, and specifically relates to a device and an operating method for supporting switching of multiple water treatment methods, comprising a non-closed shell, a water inlet pipe is installed at one end of the shell, and a water outlet pipe is installed at the other end of the shell; from the water inlet pipe to the water outlet pipe, a regulating tank, a main reaction tank, a secondary reaction tank, a degassing tank and a flocculation tank are arranged in sequence in the shell; a serpentine flow channel is also opened in the shell, and the serpentine flow channel connects the regulating tank, the main reaction tank, the secondary reaction tank, the degassing tank and the flocculation tank in series; compared with the prior art, the device for supporting switching of multiple water treatment methods of the present invention can switch between Fenton water treatment process, PACA water treatment process and coagulation water treatment process, which solves the technical problem in the prior art that "different sewage treatment processes often use different water treatment equipment, which cannot be compatible and switched with each other"; it can meet the mechanical stirring intensity required for different stages of Fenton process, PACA process and coagulation process.

Description

Technical Field

[0001] The present invention belongs to the technical field of sewage treatment equipment, and in particular relates to a device and an operating method for supporting switching of multiple water treatment methods. Background Art

[0002] The Fenton process is a commonly used chemical wastewater treatment method that uses hydrogen peroxide and iron ions to generate free radicals in wastewater to decompose organic matter. The Fenton process is popular due to its high efficiency and simplicity, especially in industrial wastewater containing difficult-to-treat organic matter. The Fenton oxidation tower is a necessary equipment for the Fenton process, also known as the Fenton reactor or Fenton reaction tank.

[0003] The sewage coagulation treatment process is a treatment method that adds coagulants to sewage to eliminate or reduce the mutual repulsion between colloidal particles in the water, making it easier for the colloidal particles in the water to collide and agglomerate with each other to become larger particles or flocs, and then separate them from the water. Sewage coagulation treatment requires coagulant preparation and dosing equipment, mixing equipment, reaction equipment and alum floc separation equipment.

[0004] The PACA process uses PACA composite aluminum silicate preparations to treat sewage. The composite aluminum silicate preparation is a redox agent. In addition to aluminum silicate components, the preparation also contains a certain amount of oxidant. After the PACA composite aluminum silicate preparation is added to the water body, the COD in the water is removed through chemical reactions, and decolorization and harmlessness are achieved at the same time; the use of PACA composite aluminum silicate preparations can also reduce the chemical oxygen demand (COD) and biological oxygen demand (BOD) in the water treatment process, which is beneficial to environmental protection.

[0005] As mentioned above, the above-mentioned sewage treatment processes have different characteristics, so they require different equipment. Different sewage treatment processes in the prior art often use different water treatment equipment, which are not compatible and cannot be switched with each other. Sewage treatment plants need to be equipped with different water treatment equipment to treat different sewage, which has high investment and maintenance costs. Summary of the invention

[0006] The present invention aims to solve the technical problem that different sewage treatment processes in the prior art often use different water treatment equipment and are not compatible and switchable with each other, and provides a device and an operation method that supports switching of multiple water treatment methods.

[0007] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a device that supports switching of multiple water treatment methods, comprising a non-closed shell, a water inlet pipe is installed at one end of the shell, and a water outlet pipe is installed at the other end of the shell; from the water inlet pipe to the water outlet pipe, a regulating tank, a main reaction tank, a secondary reaction tank, a degassing tank and a flocculation tank are arranged in sequence in the shell; a serpentine flow channel is also opened in the shell, and the serpentine flow channel connects the regulating tank, the main reaction tank, the secondary reaction tank, the degassing tank and the flocculation tank in series.

[0008] Preferably, an acid dosing pipe is installed on the top plate of the regulating tank, and the regulating tank is also installed with an regulating stirring device, the regulating stirring device includes a motor 1, a reducer 1 and an agitator 1, the motor 1 and the reducer 1 are transmission connected, and the reducer 1 and the agitator 1 are drivingly connected; the agitator 1 is in the regulating tank, and the motor 1 and the reducer 1 are above the top plate of the regulating tank; the water inlet pipe is installed on the upper outer side of the regulating tank.

[0009] Preferably, the lower inner part of the regulating tank is connected to the lower part of the main reaction tank; the main reaction tank is divided into three main reaction chambers from top to bottom by a partition, and one or more vertical through holes are provided on the partition; a main reaction stirring device is installed in each main reaction chamber; a ferrous sulfate dosing pipe and a dosing pipe 1 are installed on the bottom plate of the lower part of the main reaction tank.

[0010] Preferably, the upper part of the main reaction tank is connected to the upper part of the auxiliary reaction tank; the auxiliary reaction tank is equipped with a auxiliary reaction stirring device; and a polyaluminium chloride dosing pipe is installed on the bottom plate of the lower part of the auxiliary reaction tank.

[0011] Preferably, the lower part of the secondary reaction tank is connected to the lower part of the degassing tank; a degassing device is installed at the lower part of the degassing tank, and the degassing device includes an air compressor, a degassing main pipe and a plurality of degassing branch pipes; a plurality of the degassing branch pipes are evenly installed on the lower bottom plate of the degassing tank, and the degassing branch pipes are connected to the output end of the air compressor through the degassing main pipe; an alkali dosing pipe is installed on the top plate of the degassing tank.

[0012] Preferably, the upper part of the degassing tank is connected to the upper part of the flocculation tank; a polyacrylamide dosing tube is installed on the top plate of the flocculation tank; the flocculation tank is installed with a flocculation stirring device, the flocculation stirring device includes motor 2, reducer 2 and agitator 2, the motor 2 and reducer 2 are transmission connected, the reducer 2 and agitator 2 are drivingly connected; the agitator 2 is in the flocculation tank, the motor 2 and reducer 2 are above the top plate of the flocculation tank; the outlet pipe is installed at the lower outer side of the flocculation tank.

[0013] Preferably, it also includes a sedimentation tank, wherein a mud discharge pipe is installed at the lower end of the sedimentation tank, a water outlet trough is opened at the upper part of the sedimentation tank, a drain pipe is installed at the outer wall of the sedimentation tank corresponding to the water outlet trough, and the end of the water outlet pipe away from the flocculation tank is connected to the upper part of the sedimentation tank through the sedimentation tank water inlet pipe.

[0014] Preferably, the maximum rotation speed of the main reaction stirring device is greater than the maximum rotation speed of the secondary reaction stirring device; and the rotation speeds of the main reaction stirring device and the secondary reaction stirring device are both adjustable.

[0015] An operating method of a device supporting switching of multiple water treatment methods, using the device supporting switching of multiple water treatment methods to realize switching of Fenton process, PACA process and coagulation process;

[0016] Operation of Fenton process: sewage is transported into the regulating tank through the water inlet pipe, and hydrochloric acid is added through the acid dosing pipe to adjust the pH in the regulating tank to 3-4. In the main reaction tank, ferrous sulfate is first added to the water body through the ferrous sulfate dosing pipe, and then hydrogen peroxide is added to the water body through the dosing pipe 1. After being fully stirred and mixed by the main reaction stirring device, an oxidation reaction occurs to generate flocculent precipitation; at this time, small bubbles in the water body will adhere to the generated sludge. The water body enters the secondary reaction tank after passing through the main reaction tank. The degassing device degases the water body to remove the bubbles from the sludge. Sodium hydroxide is added through the alkali dosing pipe to adjust the pH of the sewage to 6-9, and then polyacrylamide PAM is added through the polyacrylamide dosing pipe. After being stirred evenly and fully flocculated by the stirrer 2, it is transported to the subsequent sedimentation tank through the outlet pipe and the sedimentation tank inlet pipe for precipitation. The supernatant flows out through the drain pipe, and the sludge in the sedimentation tank is discharged through the sludge discharge pipe;

[0017] Operation of PACA process: sewage is transported into the regulating tank through the water inlet pipe, and PACA composite aluminum silicate preparation is added to the water body through the dosing pipe 1 in the main reaction tank. After being stirred by the main reaction stirring device, the PACA composite aluminum silicate preparation and sewage are fully mixed and reacted. The subsequent degassing device removes the small bubbles attached to the sludge and further stabilizes the reaction effect; polyacrylamide PAM is added through the polyacrylamide dosing pipe, and after being fully stirred and mixed by the stirrer 2, it is transported to the subsequent sedimentation tank through the outlet pipe and the sedimentation tank inlet pipe for sedimentation. The supernatant flows out through the drain pipe, and the sludge in the sedimentation tank is discharged through the sludge discharge pipe;

[0018] Operation of coagulation process: sewage is transported into the regulating tank through the water inlet pipe, and polyaluminium chloride (PAC) is added to the water body through the polyaluminium chloride dosing pipe in the side reaction tank behind for coagulation, and then polyacrylamide (PAM) is added through the polyacrylamide dosing pipe for flocculation. The side reaction stirring device and the stirrer 2 are fully stirred and mixed, and the sewage after the reaction is transported to the sedimentation tank through the outlet pipe and the sedimentation tank inlet pipe for sedimentation, the supernatant flows out through the drain pipe, and the sludge in the sedimentation tank is discharged through the sludge discharge pipe.

[0019] Preferably, when the sewage water is industrial wastewater containing degradable organic matter, the device supporting the switching of multiple water treatment methods runs the Fenton process; when the sewage water is wastewater containing suspended matter and colloidal substances, the device supporting the switching of multiple water treatment methods runs the coagulation process; when the treated water needs to be recycled, the device supporting the switching of multiple water treatment methods runs the PACA process.

[0020] Compared with the prior art, the advantages and positive effects of the present invention are:

[0021] (1) The device supporting the switching of multiple water treatment methods of the present invention can be used to switch between Fenton water treatment process, PACA water treatment process and coagulation water treatment process, thereby solving the technical problem in the prior art that "different sewage treatment processes often use different water treatment equipment and cannot be compatible and switched with each other";

[0022] (2) When the coagulation process is in operation, the sewage is transported from the water inlet pipe into the regulating tank, and in the secondary reaction tank behind, polyaluminium chloride (PAC) is added to the water body through the polyaluminium chloride dosing pipe for coagulation, and then polyacrylamide (PAM) is added through the polyacrylamide dosing pipe for flocculation; the above technical scheme meets the requirement that "the stirring intensity and water flow velocity of the coagulation reaction should be low to ensure the stable growth of the flocculent body";

[0023] (3) When the Fenton process and PACA process are operated, the added drugs need to undergo redox reactions with the water body, and the required reaction time is longer than that of the coagulation process. Therefore, the dosing point is set in the main reaction tank, and after the addition of drugs, the reaction is carried out in the main reaction tank and the secondary reaction tank; at the same time, the maximum speed of the main reaction stirring device is greater than the maximum speed of the secondary reaction stirring device, which can accelerate the mixing and reaction of the water body in the main reaction tank and the added drugs, thereby improving the reaction efficiency;

[0024] (4) The main reaction pool is divided into three main reaction chambers from top to bottom by a partition, and one or more vertical through holes are opened on the partition; each main reaction chamber is equipped with a main reaction stirring device; the speed of the main reaction stirring device can be adjusted to meet the mechanical stirring intensity required at different stages of the Fenton process and the PACA process, such as weaker mechanical stirring in the early stage of the Fenton process and stronger mechanical stirring in the middle and late stages; at the same time, the speed of the main reaction stirring device can be adjusted according to the nature of the wastewater and the treatment target to ensure the best mixing effect and reaction rate;

[0025] (5) The operation of the Fenton process is that the sewage is transported into the regulating tank through the water inlet pipe, and hydrochloric acid is added through the acid dosing pipe to adjust the pH in the regulating tank to 3-4 to meet the requirements of the Fenton reaction;

[0026] (6) A degassing device is installed at the bottom of the degassing tank, which uses compressed air to discharge the gas in the water. Specifically, the air compressor compresses the air and injects it into the water through the degassing main pipe and the degassing branch pipe, and uses the air pressure to remove the gas in the water, thereby achieving the degassing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the following is a brief introduction to the drawings required for describing the embodiment:

[0028] Figure 1 Schematic diagram of a device that supports switching between multiple water treatment methods.

[0029] Description of reference numerals:

[0030] 1. Motor 1, 2. Reducer 1, 3. Acid dosing pipe, 4. Water inlet pipe, 5. Regulating tank, 6. Agitator 1, 7. Main reaction stirring device, 8. Ferrous sulfate dosing pipe, 9. Dosing pipe 1, 10. Polyaluminium chloride dosing pipe, 11. Alkali dosing pipe, 12. Degassing device, 13. Degassing branch pipe, 14. Degassing main pipe, 15. Air compressor, 16. Polyacrylamide dosing pipe, 17. Motor 2, 18. Reducer 2, 19. Agitator 2, 20. Outlet pipe, 21. Sedimentation tank inlet pipe, 22. Drain pipe, 23. Water outlet trough, 24. Sedimentation tank, 25. Mud discharge pipe, 26. Main reaction tank, 27. Partition, 28. Auxiliary reaction tank, 29. Flocculation tank, 30. Degassing tank, 31. Auxiliary reaction stirring device. DETAILED DESCRIPTION

[0031] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described below with reference to the accompanying drawings and embodiments.

[0032] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure.

[0033] Example 1

[0034] Combine the following Figure 1 The device supporting the switching of multiple water treatment methods in Example 1 is further described as follows: Figure 1 As shown, it includes a non-closed shell, with an inlet pipe 4 installed at one end of the shell and an outlet pipe 20 installed at the other end of the shell; from the inlet pipe 4 to the outlet pipe 20, a regulating tank 5, a main reaction tank 26, a secondary reaction tank 28, a degassing tank 30 and a flocculation tank 29 are arranged in sequence in the shell; a serpentine flow channel is also opened in the shell, and the serpentine flow channel is connected in series with the regulating tank 5, the main reaction tank 26, the secondary reaction tank 28, the degassing tank 30 and the flocculation tank 29.

[0035] like Figure 1 As shown, an acid dosing pipe 3 is installed on the top plate of the regulating tank 5, and the regulating tank 5 is also installed with a regulating stirring device, which includes a motor 1, a reducer 2 and a stirrer 6. The motor 1 and the reducer 2 are transmission-connected, and the reducer 2 and the stirrer 6 are drivingly connected; the stirrer 6 is in the regulating tank 5, and the motor 1 and the reducer 2 are above the top plate of the regulating tank 5; the water inlet pipe 4 is installed on the upper outer side of the regulating tank 5.

[0036] like Figure 1 As shown, the lower inner part of the regulating tank 5 is connected with the lower part of the main reaction tank 26; the main reaction tank 26 is divided into three main reaction chambers from top to bottom by the partition 27, and one or more vertical through holes are opened on the partition 27; a main reaction stirring device 7 is installed in each main reaction chamber; a ferrous sulfate dosing pipe 8 and a dosing pipe 9 are installed on the bottom plate of the lower part of the main reaction tank 26.

[0037] like Figure 1 As shown, the upper part of the main reaction tank 26 is connected to the upper part of the auxiliary reaction tank 28; the auxiliary reaction tank 28 is equipped with an auxiliary reaction stirring device 31; and a polyaluminium chloride dosing pipe 10 is installed on the bottom plate of the lower part of the auxiliary reaction tank 28.

[0038] like Figure 1 As shown, the lower part of the secondary reaction tank 28 is connected to the lower part of the degassing tank 30; a degassing device 12 is installed at the lower part of the degassing tank 30, and the degassing device 12 includes an air compressor 15, a degassing main pipe 14 and a plurality of degassing branch pipes 13; a plurality of degassing branch pipes 13 are evenly installed on the lower bottom plate of the degassing tank 30, and the degassing branch pipes 13 are connected to the output end of the air compressor 15 through the degassing main pipe 14; an alkali dosing pipe 11 is installed on the top plate of the degassing tank 30.

[0039] The degassing device 12 discharges the gas in the water by compressed air. Specifically, the air compressor 15 compresses the air and injects it into the water through the degassing main pipe 14 and the degassing branch pipe 13, and uses the air pressure to force the gas in the water out, thereby achieving the degassing effect.

[0040] like Figure 1 As shown, the upper part of the degassing tank 30 is connected with the upper part of the flocculation tank 29; a polyacrylamide dosing pipe 16 is installed on the top plate of the flocculation tank 29; the flocculation tank 29 is installed with a flocculation stirring device, the flocculation stirring device includes a motor 17, a reducer 18 and a stirrer 19, the motor 17 and the reducer 18 are transmission-connected, the reducer 18 and the stirrer 19 are drivingly connected; the stirrer 19 is in the flocculation tank 29, the motor 17 and the reducer 18 are above the top plate of the flocculation tank 29; the outlet pipe 20 is installed at the lower outer side of the flocculation tank 29.

[0041] like Figure 1As shown, the device supporting switching of multiple water treatment methods also includes a sedimentation tank 24, a mud discharge pipe 25 is installed at the lower end of the sedimentation tank 24, a water outlet trough 23 is opened at the upper part of the sedimentation tank 24, a drain pipe 22 is installed at the outer wall of the sedimentation tank 24 and the corresponding position of the water outlet trough 23, and the end of the water outlet pipe 20 away from the flocculation tank 29 is connected to the upper part of the sedimentation tank 24 through the sedimentation tank inlet pipe 21.

[0042] The maximum speed of the main reaction stirring device 7 is greater than the maximum speed of the auxiliary reaction stirring device 31. The speeds of the main reaction stirring device 7 and the auxiliary reaction stirring device 31 can be adjusted. In this embodiment, the maximum speed of the auxiliary reaction stirring device 31 is 100 rpm.

[0043] An operating method of a device supporting switching of multiple water treatment methods, using the above-mentioned device supporting switching of multiple water treatment methods to realize switching of Fenton process, PACA process and coagulation process:

[0044] Operation of Fenton process: sewage is transported from the water inlet pipe 4 into the regulating tank 5, hydrochloric acid is added through the acid dosing pipe 3 to adjust the pH in the regulating tank 5 to 3-4, ferrous sulfate is first added to the water body through the ferrous sulfate dosing pipe 8 in the main reaction tank 26, and then hydrogen peroxide is added to the water body through the dosing pipe 9. After being fully stirred and mixed by the main reaction stirring device 7, an oxidation reaction occurs to generate flocculent precipitation; at this time, small bubbles in the water body will adhere to the generated sludge, and the water body will enter the main reaction tank 26 after entering the Enter the secondary reaction tank 28, the degassing device 12 degasses the water body, removes bubbles from the sludge, adds sodium hydroxide through the alkali dosing pipe 11 to adjust the pH of the sewage to 6-9, and then adds polyacrylamide PAM through the polyacrylamide dosing pipe 16. After being stirred evenly and fully flocculated by the agitator 19, it is transported to the subsequent sedimentation tank 24 through the outlet pipe 20 and the sedimentation tank inlet pipe 21 for sedimentation. The supernatant flows out through the drain pipe 22, and the sludge in the sedimentation tank 24 is discharged through the sludge discharge pipe 25;

[0045] Operation of PACA process: sewage is transported from the water inlet pipe 4 to the regulating tank 5, and PACA composite aluminum silicate preparation is added to the water body through the dosing pipe 1 9 in the main reaction tank 26. After being stirred by the main reaction stirring device 7, the PACA composite aluminum silicate preparation and sewage are fully mixed and reacted. The subsequent degassing device 12 removes small bubbles attached to the sludge and further stabilizes the reaction effect; polyacrylamide PAM is added through the polyacrylamide dosing pipe 16, and after being fully stirred and mixed by the stirrer 2 19, it is transported to the subsequent sedimentation tank 24 through the outlet pipe 20 and the sedimentation tank inlet pipe 21 for sedimentation, and the supernatant flows out through the drain pipe 22, and the sludge in the sedimentation tank 24 is discharged through the sludge discharge pipe 25;

[0046] Operation of coagulation process: sewage is transported from the water inlet pipe 4 to the regulating tank 5, and polyaluminium chloride PAC is added to the water body through the polyaluminium chloride dosing pipe 10 in the side reaction tank 28 for coagulation, and then polyacrylamide PAM is added through the polyacrylamide dosing pipe 16 for flocculation, and the side reaction stirring device 31 and the stirrer 2 19 are fully stirred and mixed, and the sewage after the reaction is transported to the sedimentation tank 24 through the outlet pipe 20 and the sedimentation tank inlet pipe 21 for sedimentation, and the supernatant flows out through the drain pipe 22, and the sludge in the sedimentation tank 24 is discharged through the sludge discharge pipe 25. The above technical scheme meets the requirement of "the stirring intensity and water flow velocity of the coagulation reaction should be low to ensure the stable growth of the flocculent body".

[0047] When the Fenton process and the PACA process are operated, since the added drugs need to undergo an oxidation-reduction reaction with the water body, the required reaction time is longer than that of the coagulation process, so the drug adding point is set in the main reaction tank 26. After adding the drugs, the reactions are carried out in the main reaction tank 26 and the secondary reaction tank 28. At the same time, the maximum speed of the main reaction stirring device 7 is greater than the maximum speed of the secondary reaction stirring device 31, which can accelerate the mixing and reaction of the water body in the main reaction tank 26 and the added drugs, thereby improving the reaction efficiency.

[0048] PACA composite aluminum silicate preparation is a redox agent. In addition to aluminum silicate components, PACA composite aluminum silicate preparation also contains a certain amount of oxidant. In this embodiment, the PACA composite aluminum silicate preparation is a product produced by Jinan Runtai Biotechnology Co., Ltd., which is a latex-like liquid prepared by compounding a water purifier with a coupling agent, hydrochloric acid and water. The above-mentioned latex-like liquid is acidic, with a pH between 1-5, and has reduction and oxidation composite properties. It can flocculate and separate pollutants in sewage, and trace soluble pollutants can be removed by oxidation. The main components of the water purifier and the coupling agent are aluminum, silicon, magnesium, calcium, sodium and sulfate. Therefore, the PACA composite aluminum silicate preparation is used for sewage treatment, which can remove COD in the wastewater and achieve decolorization and harmless treatment at the same time.

[0049] The main reaction pool 26 is divided into three main reaction chambers from top to bottom by a partition 27, and one or more vertical through holes are opened on the partition 27; a main reaction stirring device 7 is installed in each main reaction chamber; the rotation speed of the main reaction stirring device 7 can be adjusted; to meet the mechanical stirring intensity required in different stages of the Fenton process and the PACA process, for example, weaker mechanical stirring is performed in the early stage of the Fenton process, and stronger mechanical stirring is performed in the middle and late stages; at the same time, the rotation speed of the main reaction stirring device 7 needs to be adjusted according to the nature of the wastewater and the treatment objectives to ensure the best mixing effect and reaction rate.

[0050] When the sewage water is industrial wastewater containing degradable organic matter such as benzene, phenols, ketones, acids, aldehydes, etc., the device that supports switching between multiple water treatment methods runs the Fenton process; when the sewage water is wastewater containing suspended matter and colloidal substances, the device that supports switching between multiple water treatment methods runs the coagulation process; when the treated water needs to be recycled, the device that supports switching between multiple water treatment methods runs the PACA process.

[0051] When the iron ion content in the water is too high, the water will appear obvious yellow or yellow-brown, and may even turn red or reddish brown. If the concentration of iron ions in the circulating water used in industrial production is high, it will cause the product to recolor and affect the product quality. Therefore, in many production water, it is not allowed to contain too much iron ions, otherwise secondary treatment is required.

[0052] Example 2

[0053] The difference between this embodiment and embodiment 1 is that the device supporting switching of multiple water treatment methods in this embodiment only switches between "operating the Fenton process" and "operating the coagulation process" according to the sewage inflow conditions.

[0054] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes for application in other fields. However, any simple modification or equivalent change made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A method for operating a device that supports switching between multiple water treatment methods, characterized in that: Use a device that supports switching between multiple water treatment methods to achieve switching between Fenton process, PACA process and coagulation process; The device supporting the switching of multiple water treatment methods comprises a non-enclosed shell, one end of which is provided with a water inlet pipe (4), and the other end of which is provided with a water outlet pipe (20); from the water inlet pipe (4) to the water outlet pipe (20), a regulating tank (5), a main reaction tank (26), a secondary reaction tank (28), a degassing tank (30), a flocculation tank (29) and a sedimentation tank (24) are arranged in sequence in the shell; a serpentine flow channel is also provided in the shell, and the serpentine flow channel connects the regulating tank (5), the main reaction tank (26), the secondary reaction tank (28), the degassing tank (30) and the flocculation tank (29) in series; a polyaluminium chloride dosing pipe (10) is installed on the bottom plate of the lower part of the secondary reaction tank (28); an alkali dosing pipe (11) is installed on the top plate of the degassing tank (30); and a degassing device (12) is installed at the lower part of the degassing tank (30); An acid dosing pipe (3) is installed on the top plate of the regulating tank (5), and the regulating tank (5) is also installed with a regulating stirring device; the lower inner side of the regulating tank (5) is connected to the lower part of the main reaction tank (26); the main reaction tank (26) is divided into three main reaction chambers from top to bottom by a partition (27), and one or more vertical through holes are opened on the partition (27); each of the main reaction chambers is installed with a main reaction stirring device (7); a ferrous sulfate dosing pipe (8) and a dosing pipe 1 (9) are installed on the bottom plate of the lower part of the main reaction tank (26); The upper part of the main reaction tank (26) is connected to the upper part of the auxiliary reaction tank (28); the auxiliary reaction tank (28) is equipped with an auxiliary reaction stirring device (31); The lower part of the side reaction tank (28) is connected to the lower part of the degassing tank (30); the upper part of the degassing tank (30) is connected to the upper part of the flocculation tank (29); a polyacrylamide dosing pipe (16) is installed on the top plate of the flocculation tank (29); the flocculation tank (29) is installed with a flocculation stirring device, and the flocculation stirring device includes a second motor (17), a second reducer (18) and a second stirrer (19); the end of the outlet pipe (20) away from the flocculation tank (29) is connected to the upper part of the sedimentation tank (24) through the sedimentation tank inlet pipe (21); A mud discharge pipe (25) is installed at the lower end of the sedimentation tank (24), a water outlet trough (23) is opened at the upper part of the sedimentation tank (24), and a drainage pipe (22) is installed at a position corresponding to the outer wall of the sedimentation tank (24) and the water outlet trough (23); Operation of Fenton process: sewage is transported from the water inlet pipe (4) into the regulating tank (5), hydrochloric acid is added through the acid dosing pipe (3) to adjust the pH in the regulating tank (5) to 3-4, ferrous sulfate is first added to the water body through the ferrous sulfate dosing pipe (8) in the main reaction tank (26), and then hydrogen peroxide is added to the water body through the dosing pipe (9). After being fully stirred and mixed by the main reaction stirring device (7), an oxidation reaction occurs to generate flocculent precipitation; at this time, small bubbles in the water body will adhere to the generated sludge, and the water body will enter the secondary reaction tank (26) after passing through the main reaction tank (26). The reaction tank (28) is degassed by the degassing device (12) to remove air bubbles from the sludge. Sodium hydroxide is added through the alkali dosing pipe (11) to adjust the pH value of the sewage to 6-9. Polyacrylamide (PAM) is then added through the polyacrylamide dosing pipe (16). After being stirred evenly and fully flocculated by the agitator (19), the sewage is transported to the subsequent sedimentation tank (24) through the outlet pipe (20) and the sedimentation tank inlet pipe (21) for sedimentation. The supernatant flows out through the drain pipe (22), and the sludge in the sedimentation tank (24) is discharged through the sludge discharge pipe (25); Operation of the PACA process: sewage is transported from the water inlet pipe (4) into the regulating tank (5), and the PACA composite aluminum silicate preparation is added to the water body through the dosing pipe 1 (9) in the main reaction tank (26). After being stirred by the main reaction stirring device (7), the PACA composite aluminum silicate preparation and the sewage are fully mixed and reacted. The subsequent degassing device (12) removes small bubbles attached to the sludge and further stabilizes the reaction effect; polyacrylamide PAM is added through the polyacrylamide dosing pipe (16), and after being fully stirred and mixed by the stirrer 2 (19), it is transported to the subsequent sedimentation tank (24) through the outlet pipe (20) and the sedimentation tank inlet pipe (21) for sedimentation, and the supernatant flows out through the drain pipe (22), and the sludge in the sedimentation tank (24) is discharged through the sludge discharge pipe (25); Operation of the coagulation process: sewage is transported from the water inlet pipe (4) into the regulating tank (5), and polyaluminium chloride (PAC) is added to the water body through the polyaluminium chloride dosing pipe (10) in the subsequent side reaction tank (28) for coagulation, and then polyacrylamide (PAM) is added through the polyacrylamide dosing pipe (16) for flocculation, and the side reaction stirring device (31) and the stirrer 2 (19) are fully stirred and mixed, and the sewage after the reaction is transported to the sedimentation tank (24) through the outlet pipe (20) and the sedimentation tank inlet pipe (21) for sedimentation, and the supernatant flows out through the drain pipe (22), and the sludge in the sedimentation tank (24) is discharged through the sludge discharge pipe (25).

2. The operating method of the device supporting switching of multiple water treatment methods according to claim 1, characterized in that: The regulating and stirring device comprises a motor (1), a reducer (2) and a stirrer (6); the motor (1) and the reducer (2) are in transmission connection, and the reducer (2) and the stirrer (6) are in driving connection; the stirrer (6) is located in a regulating tank (5), and the motor (1) and the reducer (2) are located above the top plate of the regulating tank (5); the water inlet pipe (4) is installed on the upper outer side of the regulating tank (5).

3. The operating method of the device supporting switching of multiple water treatment methods according to claim 1, characterized in that: The degassing device (12) comprises an air compressor (15), a degassing main pipe (14) and a plurality of degassing branch pipes (13); the plurality of degassing branch pipes (13) are evenly installed on the bottom plate of the degassing tank (30), and the degassing branch pipes (13) are connected to the output end of the air compressor (15) through the degassing main pipe (14).

4. The operating method of the device supporting switching of multiple water treatment methods according to claim 1, characterized in that: The second motor (17) and the second reducer (18) are in transmission connection, and the second reducer (18) and the second agitator (19) are in driving connection; the second agitator (19) is located in the flocculation tank (29), and the second motor (17) and the second reducer (18) are located above the top plate of the flocculation tank (29); the outlet pipe (20) is installed at the lower outer part of the flocculation tank (29).

5. The operating method of the device supporting switching of multiple water treatment methods according to claim 1, characterized in that: The maximum rotation speed of the main reaction stirring device (7) is greater than the maximum rotation speed of the secondary reaction stirring device (31); and the rotation speeds of the main reaction stirring device (7) and the secondary reaction stirring device (31) are both adjustable.

6. The operating method of the device supporting switching of multiple water treatment methods according to claim 1, characterized in that: When the sewage water is industrial wastewater containing degradable organic matter, the device that supports switching between multiple water treatment methods runs the Fenton process; when the sewage water is wastewater containing suspended matter and colloidal substances, the device that supports switching between multiple water treatment methods runs the coagulation process; when the treated water needs to be recycled, the device that supports switching between multiple water treatment methods runs the PACA process.

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