Fenton oxidation fluidized bed reactor for sewage treatment

Abstract

The utility model is suitable for the field of wastewater treatment equipment, and provides a Fenton oxidation fluidized bed reactor for sewage treatment, which comprises a fluidized bed reaction tank body, a sewage mixing and distributing device, a Fenton reagent feeding module, an auxiliary steam supply module and a purified water circulation module, a water purification bin, a crystal blocking layer, a ferromanganese fluidized bed layer and a reaction material mixing bin are arranged in the fluidized bed reaction tank body from top to bottom, a crystal spraying and cleaning device is arranged above the crystal blocking layer, and a sewage mixing and distributing device is arranged below the reaction material mixing bin and used for injecting sewage to be reacted. The auxiliary water vapor supply module comprises a water vapor mixer, an ozone supply device and an air compressor and is used for inputting high-pressure water vapor into the reaction material mixing bin and the crystal spraying and cleaning device respectively, so that on one hand, the mixing degree of sewage and a reaction reagent is improved, and on the other hand, a crystal barrier layer can be cleaned regularly; and the Fenton reagent feeding module is used for mixing and feeding a Fenton reagent.

Description

Technical Field

[0001] The utility model is applicable to the field of wastewater treatment equipment and provides a Fenton oxidation fluidized bed reactor for sewage treatment. Background Art

[0002] The Fenton chemical oxidation method uses the principle of hydrogen peroxide reacting with ferrous ions to produce hydroxyl free radicals to oxidize organic pollutants. It is an advanced oxidation treatment technology that is currently widely used in the field of sewage treatment. The more common Fenton oxidation technologies are photo-Fenton, electro-Fenton and Fenton fluidized bed. Among them, the Fenton fluidized bed is widely used in industry for its low operating cost and simple equipment. However, the Fenton fluidized bed process will produce iron-containing sludge. This part of the reactants will continue to accumulate during the filtration process, thereby blocking the water flow channel of the reaction tank, causing the reaction efficiency to decrease. Regular cleaning is required, but these products are attached to the tank body, which is more difficult. Utility Model Content

[0003] To this end, the utility model provides a Fenton oxidation fluidized bed reactor for sewage treatment, in which a crystal barrier layer is arranged in the fluidized bed reaction tank body to precipitate and attach the iron-containing sludge precipitated by the Fenton reaction, and at the same time, an auxiliary water vapor supply module is shared with the sewage mixing water distribution device. The high-pressure mixed water vapor provided by the auxiliary water vapor supply module is used to regularly flush and clean the crystal barrier layer to ensure its cleanliness.

[0004] In order to achieve the above-mentioned purpose, the utility model provides the following technical solution: a Fenton oxidation fluidized bed reactor for sewage treatment, comprising:

[0005] A fluidized bed reaction tank body, wherein a clean water bin, a crystal barrier layer, a ferromanganese fluidized bed layer and a reaction material mixing bin are arranged from top to bottom in the fluidized bed reaction tank body, a clean water overflow cavity is arranged between the outer wall of the clean water bin and the inner wall of the fluidized bed reaction tank body, and the clean water overflow cavity is connected to a clean water outlet pipeline;

[0006] The sewage mixing and water distribution device is fixedly arranged below the reaction material mixing bin, and includes a water-gas mixing bin, the water-gas mixing bin is connected to a sewage inlet pipeline, and a plurality of water-gas mixing nozzles are arranged on the side of the water-gas mixing bin facing the reaction material mixing bin;

[0007] The Fenton reagent feeding module comprises a hydrogen peroxide feeding bin, a ferrous reagent feeding bin and a reaction reagent mixing pipeline, wherein one end of the reaction reagent mixing pipeline is respectively connected to the hydrogen peroxide feeding bin and the ferrous reagent feeding bin, and the other end is connected to the reaction material mixing bin;

[0008] The auxiliary water-gas supply module comprises a water-gas mixer and an air compressor, wherein the air compressor is connected to the water-gas mixer, the water-gas mixer is provided with an auxiliary water inlet pipeline and an auxiliary gas outlet pipeline, and the auxiliary gas outlet pipeline is connected to the water-gas mixing chamber;

[0009] The clean water circulation module comprises a circulating water inlet pipeline, a circulating pump and a circulating water outlet pipeline which are connected in sequence. The inlet end of the circulating water inlet pipeline is connected to the clean water overflow chamber, and the outlet end of the circulating water outlet pipeline is connected to the reaction material mixing bin.

[0010] Furthermore, the auxiliary water vapor supply module also includes an ozone supply device, and the ozone supply device is connected to the water vapor mixer.

[0011] Furthermore, a crystal spray cleaning device is arranged above the crystal barrier layer, and the crystal spray cleaning device is provided with a plurality of crystal cleaning nozzles facing the crystal barrier layer, and a cleaning water vapor inlet pipeline is arranged between the crystal spray cleaning device and the water vapor mixer.

[0012] Furthermore, the reaction reagent mixing pipeline is provided with a spiral mixing conveyor.

[0013] Furthermore, the auxiliary gas outlet pipeline, the clean water gas inlet pipeline, the ozone supply device, the hydrogen peroxide feeding bin and the ferrous reagent feeding bin are all provided with flow control valves.

[0014] Furthermore, the fluidized bed reaction tank is provided with a reaction gas exhaust port.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] 1. The solution of the utility model is provided with an auxiliary water vapor supply module, which can, on the one hand, be sprayed into the reaction material mixing bin through the sewage mixing and water distribution device to accelerate the mixing of sewage and various reaction materials and improve the reaction efficiency; on the other hand, it can automatically clean the crystal barrier layer in the shutdown state to keep it unobstructed and avoid blockage. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a Fenton oxidation fluidized bed reactor for sewage treatment mentioned in the utility model;

[0018] Figure 2 for Figure 1 A structural front view of a Fenton oxidation fluidized bed reactor for sewage treatment;

[0019] Figure 3 It is a schematic diagram of the internal structure of the fluidized bed reaction tank mentioned in the utility model.

[0020] In the figure:

[0021] 1. Fluidized bed reaction tank, 11. Clean water tank, 12. Clean water overflow chamber, 13. Reaction gas exhaust port, 14. Clean water outlet pipeline, 15. Crystal barrier layer, 16. Crystal spray cleaning device, 17. Ferromanganese fluidized bed layer, 18. Reaction material mixing tank;

[0022] 2. Sewage mixing water distribution device, 21. Water-gas mixing chamber, 22. Sewage inlet pipeline, 23. Water-gas mixing nozzle;

[0023] 3. Fenton reagent feeding module, 31. hydrogen peroxide feeding bin, 32. ferrous reagent feeding bin, 33. reaction reagent mixing pipeline, 34. spiral mixing conveyor;

[0024] 4. water purification circulation module, 41. circulating water inlet pipeline, 42. circulating pump, 43. circulating water outlet pipeline;

[0025] 5. Auxiliary water and gas supply module, 51. Ozone supply device, 52. Air compressor, 53. Water and gas mixer, 54. Auxiliary gas outlet pipeline, 55. Auxiliary water inlet pipeline, 56. Cleaning water and gas inlet pipeline. DETAILED DESCRIPTION

[0026] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0027] For example, see the attached Figures 1-2 The utility model provides a Fenton oxidation fluidized bed reactor for sewage treatment, comprising a fluidized bed reaction tank 1, a sewage mixing and water distribution device 2, a Fenton reagent feeding module 3, an auxiliary water and gas supply module 5 and a clean water circulation module 4; as shown in the attached Figure 3As shown, a clean water bin 11, a crystal barrier layer 15, a ferromanganese fluidized bed layer 17 and a reaction material mixing bin 18 are arranged from top to bottom in the fluidized bed reaction tank body 1. The fluidized bed reaction tank body 1 is also provided with a reaction gas exhaust port 13 for discharging reaction waste gas. A clean water overflow chamber 12 is arranged between the outer wall of the clean water bin 11 and the inner wall of the fluidized bed reaction tank body 1. After the reaction water fills the clean water bin 11, it will overflow from the top edge of the clean water bin 11 to the clean water overflow chamber 12. The clean water overflow chamber 12 is connected to a clean water outlet pipeline 14. The purified water is discharged from the clean water outlet pipeline 14. A crystal spray cleaning device 16 is arranged above the crystal barrier layer 15. The crystal spray cleaning device 16 faces the crystal barrier layer 15. 5 is provided with a plurality of crystal cleaning nozzles; the sewage mixing and water distribution device 2 is fixedly arranged below the reaction material mixing bin 18, which is used for injecting the sewage to be reacted, including a water-gas mixing bin 21, the water-gas mixing bin 21 is connected with a sewage inlet pipeline 22, and the water-gas mixing bin 21 is provided with a plurality of water-gas mixing nozzles 23 on the side facing the reaction material mixing bin 18; the Fenton reagent feeding module 3 includes a hydrogen peroxide feeding bin 31, a ferrous reagent feeding bin 32 and a reaction reagent mixing pipeline 33, one end of the reaction reagent mixing pipeline 33 is respectively connected with the hydrogen peroxide feeding bin 31 and the ferrous reagent feeding bin 32, and the other end is connected with the reaction material mixing bin 18, and the reaction reagent mixing pipeline 33 is provided with a spiral mixing conveyor The auxiliary water supply module 5 includes a water-gas mixer 53, an ozone supply device 51 and an air compressor 52. The air compressor 52 and the ozone supply device 51 are both connected to the water-gas mixer 53. The water-gas mixer 53 is provided with an auxiliary water inlet pipeline 55, an auxiliary gas outlet pipeline 54 and a cleaning water inlet pipeline 56. The auxiliary gas outlet pipeline 54 is connected to the water-gas mixing chamber 21, and the cleaning water inlet pipeline 56 is connected to the crystal spray cleaning device 16. The auxiliary water supply can It is possible to input air, ozone and liquid for mixed pressure injection as needed. In the conventional reaction stage, the ozone gas and air are mixed, compressed and injected into the water-gas mixing chamber 21. The high-pressure gas can be fully mixed with the sewage to be purified in the water-gas mixing chamber 21, and the water-gas mixture is uniformly sprayed into the reaction material mixing chamber 18 through the water-gas mixing nozzle 23 to mix with the Fenton reaction reagent composed of hydrogen peroxide reagent and ferrous sulfate reagent. In the shutdown cleaning stage, the high-pressure air is mixed with the cleaning auxiliary water body, and then injected into the crystal spray cleaning device 16 through the cleaning water gas inlet pipeline 56, and the crystal barrier layer 15 is sprayed and cleaned through the crystal cleaning nozzle;The clean water circulation module 4 includes a circulating water inlet pipeline 41, a circulating pump 42 and a circulating water outlet pipeline 43 which are connected in sequence. The inlet end of the circulating water inlet pipeline 41 is connected to the clean water overflow chamber 12, and the outlet end of the circulating water outlet pipeline 43 is connected to the reaction material mixing chamber 18. Since the concentration of the sewage to be purified is high, it is generally necessary to use clean water to dilute it during the reaction to speed up the reaction efficiency. The clean water generated by the device itself can be refluxed and recycled through the clean water circulation module 4, which is more efficient and will not cause waste. ;

[0028] In one of the examples, the auxiliary gas outlet pipeline 54, the cleaning water gas inlet pipeline 56, the ozone supply device 51, the hydrogen peroxide feeding bin 31 and the ferrous reagent feeding bin 32 are all provided with flow control valves, through which the feeding amount and feeding speed of each pipeline can be remotely and automatically controlled, and the feeding of each pipeline is handled by the circulating pump 42 and other equipment, and the automatic control of each equipment is handled by the background electronic control equipment, which is the conventional technology in this industry and will not be described in detail in the present utility model.

[0029] The working principle of this embodiment is as follows:

[0030] First, the sewage to be purified is input into the water-gas mixing chamber 21 through the sewage inlet pipe 22. At the same time, the ozone gas and the high-pressure gas provided by the air compressor 52 and the ozone supply device 51 are mixed in the water-gas mixer 53 and enter the water-gas mixing chamber 21 through the auxiliary gas outlet pipe 54. After mixing with the sewage to be purified, the water-gas mixture in the water-gas mixing chamber 21 is sprayed into the reaction material mixing chamber 18, and the hydrogen peroxide feeding chamber 31 and the ferrous reagent feeding chamber 32 respectively inject the sodium hydroxide reagent and the ferrous sulfate reagent required for the Fenton reaction into the reaction reagent mixing pipe 33, and then mixed and put into the reaction material mixing chamber 18. As the liquid level in the reaction material mixing bin 18 rises, the reaction liquid rises to the manganese iron fluidized bed layer 17 to start the Fenton oxidation reaction, and the organic pollutants in the sewage to be purified are reacted and removed, and then the liquid level continues to rise and passes through the crystal barrier layer 15 to screen out part of the iron-containing sludge and other large particles, and finally overflows from the upper edge of the clean water bin 11 into the clean water overflow chamber 12. On the one hand, the clean water in the clean water overflow chamber 12 flows out from the clean water outlet pipeline 14, and on the other hand, part of it flows back to the reaction material mixing bin 18 through the clean water circulation module 4. This part of the clean water is used to dilute the concentration of the sewage to be purified, improve the reaction efficiency, and improve the purification effect;

[0031] After the reactor has been used for a period of time, a certain amount of iron-containing sludge accumulates in the crystal barrier layer 15. At this time, high-pressure clean water is input into the crystal spray cleaning device 16 through the air compressor 52 and the cleaning water gas inlet pipe 56. The crystal spray cleaning device 16 sprays and cleans the crystal barrier layer 15 through the crystal cleaning nozzle to remove impurities and ensure that the interior is unobstructed.

[0032] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise stated, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0033] The above are only preferred embodiments of the present invention. Any person skilled in the art may modify the present invention or modify it into an equivalent technical solution by using the above technical solution. Therefore, any simple modification or equivalent replacement based on the technical solution of the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A Fenton oxidation fluidized bed reactor for sewage treatment, characterized in that: include: A fluidized bed reaction tank (1), wherein a clean water bin (11), a crystal barrier layer (15), a manganese iron fluidized bed layer (17) and a reaction material mixing bin (18) are arranged from top to bottom in the fluidized bed reaction tank (1), a clean water overflow chamber (12) is arranged between the outer wall of the clean water bin (11) and the inner wall of the fluidized bed reaction tank (1), and the clean water overflow chamber (12) is connected to a clean water outlet pipeline (14); The sewage mixing and water distribution device (2) is fixedly arranged below the reaction material mixing bin (18), and comprises a water-gas mixing bin (21). The water-gas mixing bin (21) is connected to a sewage inlet pipeline (22). The water-gas mixing bin (21) is provided with a plurality of water-gas mixing nozzles (23) on the side facing the reaction material mixing bin (18); A Fenton reagent feeding module (3) comprises a hydrogen peroxide feeding bin (31), a ferrous reagent feeding bin (32) and a reaction reagent mixing pipeline (33), wherein one end of the reaction reagent mixing pipeline (33) is respectively connected to the hydrogen peroxide feeding bin (31) and the ferrous reagent feeding bin (32), and the other end is connected to the reaction material mixing bin (18); The auxiliary water-gas supply module (5) comprises a water-gas mixer (53) and an air compressor (52), wherein the air compressor (52) is connected to the water-gas mixer (53), and the water-gas mixer (53) is provided with an auxiliary water inlet pipeline (55) and an auxiliary gas outlet pipeline (54), and the auxiliary gas outlet pipeline (54) is connected to the water-gas mixing chamber (21); The clean water circulation module (4) comprises a circulating water inlet pipeline (41), a circulating pump (42) and a circulating water outlet pipeline (43) which are connected in sequence, wherein the inlet end of the circulating water inlet pipeline (41) is connected to the clean water overflow chamber (12), and the outlet end of the circulating water outlet pipeline (43) is connected to the reaction material mixing chamber (18).

2. A Fenton oxidation fluidized bed reactor for sewage treatment according to claim 1, characterized in that: The auxiliary water vapor supply module (5) further comprises an ozone supply device (51), and the ozone supply device (51) is connected to the water vapor mixer (53).

3. A Fenton oxidation fluidized bed reactor for sewage treatment according to claim 1, characterized in that: A crystal spray cleaning device (16) is arranged above the crystal barrier layer (15); the crystal spray cleaning device (16) is provided with a plurality of crystal cleaning nozzles facing the crystal barrier layer (15); and a cleaning water vapor inlet pipeline (56) is arranged between the crystal spray cleaning device (16) and the water vapor mixer (53).

4. A Fenton oxidation fluidized bed reactor for sewage treatment according to claim 1, characterized in that: The reaction reagent mixing pipeline (33) is provided with a spiral mixing conveyor (34).

5. A Fenton oxidation fluidized bed reactor for sewage treatment according to any one of claims 1 to 4, characterized in that: The auxiliary gas outlet pipeline (54), the cleaned water gas inlet pipeline (56), the ozone supply device (51), the hydrogen peroxide feeding bin (31) and the ferrous reagent feeding bin (32) are all provided with flow control valves.

6. A Fenton oxidation fluidized bed reactor for sewage treatment according to claim 1, characterized in that: The fluidized bed reaction tank (1) is provided with a reaction gas exhaust port (13).

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