Up-flow multiphase Fenton reaction tower

Abstract

The utility model discloses an up-flow multiphase Fenton reaction tower, and belongs to the technical field of environment-friendly sewage treatment. The reaction tower comprises a reaction tower body and a mixing tank arranged in the reaction tower body, an input assembly is arranged on the mixing tank, a stirring assembly is arranged in the mixing tank, and a circulating jet assembly, a filtering assembly and an output assembly are arranged in the reaction tower body; wastewater and a catalyst are conveyed to the mixing tank through the input assembly, the wastewater and the catalyst are primarily mixed through the stirring assembly, a wastewater mixed solution obtained after primary mixing is subjected to jet flow intensified mixing through the circulating jet flow assembly, and the wastewater mixed solution obtained after multiple times of mixing is filtered and discharged through the filtering assembly and the output assembly. Rapid mixing of a catalyst and wastewater is achieved through the stirrer of the mixing tank, chemical mixing is enhanced through the first jet device and the second jet device, water distribution is conducted through the flow guide plate and the flow guide disc at the bottom, the pipeline blockage phenomenon is avoided, the catalyst can be effectively intercepted through the separator, and the Fenton oxidation effect is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of environmentally friendly sewage treatment, and specifically relates to an upflow multiphase Fenton reaction tower. Background Art

[0002] As an efficient advanced oxidation technology for wastewater, the Fenton process is increasingly being used to treat refractory organic matter. However, the traditional Fenton system has problems such as low hydrogen peroxide utilization, low reaction efficiency, and high iron sludge production. The existing Fenton reactor reagents are not mixed evenly with the sewage, resulting in poor treatment effects.

[0003] The Fenton fluidized bed utilizes a fluidized bed to allow most of the trivalent iron produced by the Fenton process to crystallize or precipitate onto the surface of the catalyst fixed in the fluidized bed. It is a new technology that combines the functions of homogeneous chemical oxidation, heterogeneous chemical oxidation, fluidized bed crystallization, and reduction and dissolution of FeOOH.

[0004] The fluidized bed reactor has improved the traditional Fenton oxidation method and solved the problem of high iron sludge yield to a certain extent. However, the existing Fenton fluidized bed technology generally has problems such as uneven water distribution, long residence time, and low reagent utilization. Utility Model Content

[0005] The purpose of the utility model is to provide an upflow multiphase Fenton oxidation tower to solve the problems raised in the above-mentioned background technology. By jet-enhanced dosing and mixing process, the efficient catalytic performance of powder adsorption catalyst is utilized, and the fluidized state technology of efficient mass transfer is used to realize rapid and efficient catalytic oxidation of organic pollutants, thus breaking through the engineering and technical difficulties of traditional Fenton technology, such as high sludge output, high dosage of reagents and large floor space.

[0006] Technical solution: In order to solve the above technical problems, the technical solution adopted by the utility model is as follows:

[0007] An upflow multiphase Fenton reaction tower comprises a reaction tower body and a mixing tank arranged in the reaction tower body, wherein the mixing tank is provided with an input component, the mixing tank is provided with a stirring component, and the reaction tower body is provided with a circulating jet component, a filtering component and an output component; wastewater and a catalyst are transported to the mixing tank by the input component, the wastewater and the catalyst are initially mixed by the stirring component, the wastewater mixed liquid after the initial mixing is subjected to jet-enhanced mixing by the circulating jet component, and the wastewater mixed liquid after multiple mixing is filtered and discharged by the filtering component and the output component.

[0008] Preferably, the input component includes an acid dosing pipe, a water inlet pipe, a pipeline mixer, a catalyst dosing pipe and an iron salt dosing pipe; one end of the water inlet pipe is connected to the mixing tank, and the other end is connected to the pipeline mixer, and the dosing port of the pipeline mixer is connected to the acid dosing pipe; the catalyst dosing pipe and the iron salt dosing pipe are both arranged on the mixing tank.

[0009] Preferably, the stirring component is a stirrer.

[0010] Preferably, a water outlet pipe is provided at the bottom of the mixing tank, and an exhaust pipe is provided on the mixing tank.

[0011] Preferably, the circulating jet assembly includes a jet assembly and a circulating assembly; the jet assembly includes a central tube, a first ejector, a second ejector, a central tube baffle and a jet pump; the central tube is arranged at the bottom end of the mixing tank; the first ejector and the second ejector are both arranged on the central tube; the central tube baffle is arranged in the central tube; the water inlet pipe of the jet pump is connected to the reaction tower body, and the water outlet pipe of the jet pump is connected to the water inlet pipe of the first ejector.

[0012] Preferably, the circulation component includes a circulation pump, a guide plate, a bottom baffle and a guide plate; the guide plate is located below the central tube and connected to the inner bottom wall of the reaction tower body; the guide plate is located above the guide plate and fixedly connected to the side inner wall of the reaction tower body; the bottom baffle is located at the bottom of the guide plate and connected to the bottom inner wall and the side inner wall of the reaction tower body; the outlet pipe of the circulation pump is connected to the guide plate, and the inlet pipe of the circulation pump is connected to the reaction tower body.

[0013] Preferably, the filtration assembly includes an overflow weir, a separator and a perforated water distribution plate; the overflow weir is arranged at the top of the reaction tower body, a water outlet trough is provided on the overflow weir, and the separator is arranged below the overflow weir; the perforated water distribution plate is arranged between the outer wall of the central tube and the inner wall of the reaction tower body, and a granular filler is provided on the perforated water distribution plate.

[0014] Preferably, the output assembly includes a water outlet and a drain pipe; the water outlet is arranged at the top of the reaction tower body and is connected to the water outlet trough of the overflow weir; the drain pipe is arranged at the bottom of the reaction tower body.

[0015] Preferably, the guide plate is arranged in a spiral ascending direction, the inclination angle of the guide plate is 2° to 4°, and the circumference angle of the guide plate is 250° to 300°.

[0016] Preferably, the separator adopts a double-layer structure, wherein the upper layer and the lower layer are respectively composed of a plurality of long strips whose two sides form equilateral angles of 60° with each other, and the separator is connected to the outer wall of the mixing tank.

[0017] Beneficial effects: Compared with the prior art, the utility model has the following advantages:

[0018] (1) The efficient dosing and mixing method is used to improve the mixing reaction efficiency and eliminate the traditional dosing and mixing tank. The catalytic oxidation and fluidized bed processes are combined to improve the reaction efficiency, shorten the reaction time, and reduce the floor space.

[0019] (2) The highly efficient multiphase reactor enhances the mass transfer effect. The efficient contact reaction reduces the dosage and operation cost. The catalyst can be reused repeatedly, and the sludge production is reduced by 30%-70%.

[0020] (3) Compared with conventional Fenton, the jet-enhanced upflow multiphase Fenton oxidation technology improves the COD removal efficiency, and the COD removal rate is increased by 10-20%, which can meet the problem that traditional Fenton treatment alone cannot meet the standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the upflow multiphase Fenton reaction tower of the utility model;

[0022] In the figure: 1. acid dosing pipe; 2. water inlet pipe; 3. pipeline mixer; 4. agitator; 5. catalyst dosing pipe; 6. iron salt dosing pipe; 7. exhaust pipe; 8. mixing tank; 9. overflow weir; 10. water outlet; 11. separator; 12. center pipe; 13. first ejector; 14. second ejector; 15. hydrogen peroxide dosing pipe; 16. perforated water distribution plate; 17. circulation pump; 18. guide plate; 19. center pipe baffle; 20. bottom baffle; 21. guide plate; 22. jet pump; 23. water outlet pipe; 24. drain pipe; 25. reaction tower body; 26. first ejector water inlet pipe. DETAILED DESCRIPTION

[0023] The present invention will be further explained below in conjunction with specific embodiments. The embodiments are implemented based on the technical solution of the present invention. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0024] like Figure 1 As shown, the upflow multiphase Fenton reaction tower provided in this embodiment has a main structure including a reaction tower body 25, a mixing tank 8 arranged in the reaction tower body 25, an input component, a stirring component, a circulating jet component, a filtering component and a discharge component; the input component is arranged on the mixing tank 8, the stirring component is arranged in the mixing tank 8, and the circulating jet component, the filtering component and the discharge component are all arranged in the reaction tower body 25.

[0025] like Figure 1As shown, the input component includes an acid dosing pipe 1, a water inlet pipe 2, a pipeline mixer 3, a catalyst dosing pipe 5 and an iron salt dosing pipe 6; one end of the water inlet pipe 2 is connected to a mixing tank 8, and the other end is connected to the pipeline mixer 3, and the dosing port of the pipeline mixer 3 is connected to the acid dosing pipe 1; the catalyst dosing pipe 5 and the iron salt dosing pipe 6 are both arranged on the mixing tank 8.

[0026] The wastewater enters the pipeline mixer 3 to be mixed with the acid solution and enters the mixing tank 8 through the water inlet pipe 2. The powdered catalyst and the iron salt enter the mixing tank 8 through the catalyst dosing pipe 5 and the iron salt dosing pipe 6 respectively.

[0027] The stirring component is a stirrer 4 disposed in the mixing tank 8 , and the stirrer 4 is used to perform initial stirring and mixing on the wastewater, acid solution, powdered catalyst and iron salt in the mixing tank 8 .

[0028] In this embodiment, a water outlet pipe 23 is provided at the bottom of the mixing tank 8; an exhaust pipe 7 is provided on the mixing tank 8, and the exhaust pipe 7 is connected to a U-shaped pipe, and the outlet of the U-shaped pipe is downwardly connected to the reaction tower body 25, so that the atmosphere in the mixing tank 8 and the reaction tower body 25 are connected.

[0029] In this embodiment, the pipeline mixer 3 is connected to the water inlet pipe 2 through a flange, the water inlet pipe 2 is connected to the mixing tank 8 through a flange, the catalyst dosing pipe 5 is connected to the mixing tank 8 through a flange, the iron salt dosing pipe 6 is connected to the mixing tank 8 through a flange, and the exhaust pipe 7 is connected to the mixing tank 8 through a flange.

[0030] In this embodiment, the hydraulic retention time of the mixing tank 8 is 2 to 5 minutes, the diameter of the mixing tank 8 is 1 / 4 to 1 / 3 of the diameter of the reaction tower body 25, the hydraulic retention time of the reaction tower body 25 is 30 to 60 minutes, and the height-to-diameter ratio of the reaction tower body 25 is 2.5:1 to 3:1.

[0031] A circulating jet assembly is provided below the mixing tank 8, and the circulating jet assembly comprises a jet assembly and a circulating assembly.

[0032] The jet assembly includes a central tube 12, a first ejector 13, a second ejector 14, a central tube baffle 19 and a jet pump 22; the top of the central tube 12 is fixed to the bottom end of the mixing tank 8, and the first ejector 13 and the second ejector 14 are provided on the central tube 12; the water inlet pipe of the jet pump 22 is connected to the reaction tower body 25, and the water outlet pipe of the jet pump 22 is connected to the water inlet pipe 26 of the first ejector.

[0033] The first ejector 13 is arranged at the top of the central tube 12, and the outlet of the water outlet pipe 23 is connected to the suction port of the first ejector 13; the second ejector 14 is arranged in the middle of the central tube 12, and the hydrogen peroxide dosing pipe 15 penetrates into the reaction tower body 25 and is connected to the second ejector 14; a plurality of central tube baffles 19 are arranged at the bottom of the central tube 12.

[0034] In this embodiment, the first ejector water inlet pipe 26 is located below the separator 11, and the water inlet pipe inlet of the ejector pump 22 is located below the first ejector water inlet pipe 26. The height difference between the water inlet pipe inlet of the ejector pump 22 and the bottom of the separator 11 is greater than 0.3m, and the ratio of the flow rate of the ejector pump 22 to the flow rate of the water inlet pipe 2 is 1:1 to 2:1.

[0035] In this embodiment, the first ejector 13 and the second ejector 14 are connected to the central tube 12 through flanges. The outlet of the central tube 12 is a bell mouth. The baffle of the central tube 12 is an inverted cone. The outlet diameter of the central tube baffle 19 is 1 / 4 to 1 / 3 of the outlet diameter of the central tube 12.

[0036] The circulation component includes a circulation pump 17, a guide plate 18, a bottom baffle 20 and a guide plate 21; a guide plate 18 is provided below the central tube 12, and the guide plate 18 is connected to the inner bottom wall of the reaction tower body 25; the guide plate 21 is located above the guide plate 18, arranged in a spiral ascending direction, and fixedly connected to the side inner wall of the reaction tower body 25; the bottom baffle 20 is an annular structure, located at the bottom end of the guide plate 21, and connected to the bottom inner wall and the side inner wall of the reaction tower body 25; the outlet pipe of the circulation pump 17 is connected to the guide plate 21, and the inlet pipe of the circulation pump 17 is connected to the reaction tower body 25.

[0037] In this embodiment, the inclination angle of the guide plate 21 is 2° to 4°, and the circumference angle of the guide plate 21 is 250° to 300°. The bottom diameter of the bottom baffle 20 is 300-500 mm larger than the bottom wall diameter of the guide plate 18, and the bottom of the guide plate 21 is at the same height as the top of the guide plate 18.

[0038] In this embodiment, the ratio of the flow rate of the circulation pump 17 to the flow rate of the water inlet pipe 2 is 1:1 to 3:1, the water inlet pipe inlet of the circulation pump 17 is located below the separator 11, and the height difference between the water inlet pipe inlet of the circulation pump 17 and the bottom of the separator 11 is greater than 0.3m.

[0039] In this embodiment, flow meters are provided on the water outlet pipe of the circulation pump 17 and the water outlet pipe of the jet pump 22 to monitor the flow rates of the circulation pump 17 and the jet pump 22 .

[0040] The filtering component includes an overflow weir 9, a separator 11 and a perforated water distribution plate 16; the overflow weir 9 is arranged at the top of the reaction tower body 25, the separator 11 is arranged below the overflow weir 9, and a water outlet trough is arranged at the side end of the overflow weir 9; the perforated water distribution plate 16 is arranged between the outer wall of the central tube 12 and the inner wall of the reaction tower body 25, and there are multiple perforated water distribution plates 16, and granular fillers are arranged on the perforated water distribution plates 16; the perforated water distribution plates 16 are arranged to filter impurities from the wastewater mixture.

[0041] In this embodiment, the number of perforated water distribution plates 16 is 3 to 6, the thickness of the perforated water distribution plates 16 is 3 cm, and a hollow structure is adopted. The aperture of the perforated water distribution plates 16 is 1 to 2 cm, the holes are arranged obliquely, the directions of adjacent holes are symmetrically staggered, the inclination angle is 60°, and the vertical spacing between adjacent perforated water distribution plates 16 is greater than 1 m.

[0042] In this embodiment, the separator 11 is made of PE material and has a double-layer structure. The upper layer and the lower layer are respectively composed of a plurality of strips with two sides forming 60° equilateral angles with each other. The height difference between the top of the separator 11 and the liquid surface is greater than 0.5m. The outer wall of the mixing tank 8 is connected to the separator 11.

[0043] The output assembly includes a water outlet 10 and an emptying pipe 24 ; the water outlet 10 is arranged at the top of the reaction tower body 25 and connected to the water outlet trough of the overflow weir 9 ; the emptying pipe 24 is arranged at the bottom of the reaction tower body 25 .

[0044] In this embodiment, online pH meters are provided in the mixing tank 8 and the reaction tower body 25 to monitor the pH of the solution.

[0045] In this embodiment, the top height of the mixing tank 8 is the same as the top height of the reaction tower, and the top of the mixing tank 8 is 0.8 to 1.2 m higher than the top of the overflow weir 9 .

[0046] In this embodiment, a powder adsorption catalyst with a mesh size of 20 to 50 is used as a Fenton catalyst, the concentration of the powder catalyst is controlled to be 20 to 30 g / L, and the pH of the solution is controlled to be 2 to 4.

[0047] The working principle or use process of the utility model is as follows: when an upflow multiphase Fenton oxidation tower is used for wastewater mixing treatment, first, the wastewater is transported to a pipeline mixer 3 to be mixed with an acid solution and enters a mixing tank 8 through a water inlet pipe 2, and a powdered catalyst and an iron salt enter the mixing tank 8 through a catalyst dosing pipe 5 and an iron salt dosing pipe 6, respectively.

[0048] The mixer 4 is started to stir and mix the mixed solution of wastewater, acid solution, powdered catalyst and iron salt in the mixing tank 8. After the stirring is completed, the outlet pipe 23 at the lower end of the mixing tank 8 is opened, and the wastewater mixed solution is transported to the first ejector 13 through the outlet pipe 23. The wastewater mixed solution is subjected to the first enhanced jet mixing through the first ejector 13 and transported to the central tube 12; then the wastewater mixed solution enters the second ejector 14, and at the same time, the hydrogen peroxide is transported to the second ejector 14 through the hydrogen peroxide dosing pipe 15. The wastewater mixed solution and hydrogen peroxide are subjected to the second enhanced jet mixing through the second ejector 14. The wastewater mixed solution is mixed again by the central tube 12 baffle in the central tube 12. The wastewater finally enters the reaction tower from the bottom outlet of the central tube 12. The guide plate 18 guides the wastewater mixed solution discharged from the central tube 12 and transports the wastewater mixture to the guide plate 21 through the bottom baffle 20, and flows upward from the bottom vortex.

[0049] When the wastewater mixed solution in the reaction tower body 25 is at the water level at the inlet of the jet pump 22 water inlet pipe and the inlet of the circulation pump 17, the jet pump 22 and the circulation pump 17 are started, and the water in the reaction tower body 25 is pumped into the first ejector water inlet pipe 26 by the jet pump 22, and the wastewater mixed solution is again transported to the first ejector 13 and the central tube 12 through the first ejector water inlet pipe 26, and the jet mixing of the wastewater mixed solution is repeatedly enhanced; the wastewater mixed solution at a high water level in the reaction tower body 25 is extracted by the circulation pump 17 and transported from the bottom of the reaction tower body 25 to the guide plate 21 in the reaction tower body 25, and the water discharged from the circulation pump 17 continues to be mixed with the original wastewater.

[0050] In the reaction tower, ferrous ions (Fe 2+ ), the powder catalyst and the particle filler catalyst are used as catalysts for hydrogen peroxide (H2O2), the organic matter and hydrogen peroxide in the wastewater diffuse from the main body of the solution to the active sites on the surface of the powder catalyst and the surface of the particle filler and are adsorbed, then under the catalytic action of the powder catalyst component, the hydrogen peroxide decomposes to produce hydroxyl radicals ·OH with high oxidation ability, and the strong oxidizing property of ·OH is used to remove organic pollutants in the wastewater, and finally the degradation products are desorbed from the catalyst surface and diffused into the main body of the solution, the powder catalyst is filtered through the perforated water distribution plate 16 and separated through the separator 11, the treated wastewater flows out from the overflow weir 9, enters the outlet 10 and is discharged from the reaction tower body 25, and the residue in the reaction tower body 25 is discharged through the drain pipe 24 at the bottom of the reaction tower.

[0051] The present invention utilizes the efficient catalytic performance of the adsorption catalyst, supplemented by the fluidized state technology of efficient mass transfer, to achieve rapid and efficient catalytic oxidation of organic pollutants.

[0052] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. An upflow multiphase Fenton reaction tower, comprising a reaction tower body (25) and a mixing tank (8) arranged in the reaction tower body (25), characterized in that: The mixing tank (8) is provided with an input assembly, the mixing tank (8) is provided with a stirring assembly, and the reaction tower body (25) is provided with a circulating jet assembly, a filtering assembly and an output assembly; the wastewater and the catalyst are transported to the mixing tank (8) by means of the input assembly, the wastewater and the catalyst are initially mixed by means of the stirring assembly, the wastewater mixed liquid after the initial mixing is subjected to jet-enhanced mixing by means of the circulating jet assembly, and the wastewater mixed liquid after multiple mixing is filtered and discharged by means of the filtering assembly and the output assembly.

2. The upflow multiphase Fenton reaction tower according to claim 1, characterized in that: The input assembly comprises an acid dosing pipe (1), a water inlet pipe (2), a pipeline mixer (3), a catalyst dosing pipe (5) and an iron salt dosing pipe (6); one end of the water inlet pipe (2) is connected to a mixing tank (8), and the other end is connected to the pipeline mixer (3); the dosing port of the pipeline mixer (3) is connected to the acid dosing pipe (1); the catalyst dosing pipe (5) and the iron salt dosing pipe (6) are both arranged on the mixing tank (8).

3. The upflow multiphase Fenton reaction tower according to claim 1, characterized in that: The stirring component is a stirrer (4).

4. The upflow multiphase Fenton reaction tower according to claim 1, characterized in that: A water outlet pipe (23) is provided at the bottom of the mixing tank (8), and an exhaust pipe (7) is provided on the mixing tank (8).

5. The upflow multiphase Fenton reaction tower according to claim 1, characterized in that: The circulating jet assembly comprises a jet assembly and a circulating assembly; the jet assembly comprises a central tube (12), a first ejector (13), a second ejector (14), a central tube baffle (19) and a jet pump (22); the central tube (12) is arranged at the bottom end of a mixing tank (8); the first ejector (13) and the second ejector (14) are both arranged on the central tube (12); the central tube baffle (19) is arranged in the central tube (12); the water inlet pipe of the jet pump (22) is connected to a reaction tower body (25), and the water outlet pipe of the jet pump (22) is connected to a water inlet pipe (26) of the first ejector.

6. The upflow multiphase Fenton reaction tower according to claim 1, characterized in that: The circulating jet assembly comprises a circulating pump (17), a guide plate (18), a bottom baffle (20) and a guide plate (21); the guide plate (18) is located below the central tube (12) and connected to the inner bottom wall of the reaction tower body (25); the guide plate (21) is located above the guide plate (18) and fixedly connected to the side inner wall of the reaction tower body (25); the bottom baffle (20) is located at the bottom of the guide plate (21) and connected to the bottom inner wall and the side inner wall of the reaction tower body (25); the water outlet pipe of the circulating pump (17) is connected to the guide plate (21), and the water inlet pipe of the circulating pump (17) is connected to the reaction tower body (25).

7. The upflow multiphase Fenton reaction tower according to claim 1, characterized in that: The filtering assembly comprises an overflow weir (9), a separator (11) and a perforated water distribution plate (16); the overflow weir (9) is arranged at the top of the reaction tower body (25), a water outlet trough is arranged on the overflow weir (9), and the separator (11) is arranged below the overflow weir (9); the perforated water distribution plate (16) is arranged between the outer wall of the central tube (12) and the inner wall of the reaction tower body (25), and a granular filler is arranged on the perforated water distribution plate (16).

8. The upflow multiphase Fenton reaction tower according to claim 1, characterized in that: The output assembly comprises a water outlet (10) and a drain pipe (24); the water outlet (10) is arranged at the top of the reaction tower body (25) and is connected to the water outlet trough of the overflow weir (9); the drain pipe (24) is arranged at the bottom of the reaction tower body (25).

9. The upflow multiphase Fenton reaction tower according to claim 6, characterized in that: The guide plate (21) is arranged in a spiral ascending direction, the inclination angle of the guide plate (21) is 2° to 4°, and the circumference angle of the guide plate (21) is 250° to 300°.

10. The upflow multiphase Fenton reaction tower according to claim 7, characterized in that: The separator (11) adopts a double-layer structure, wherein the upper layer and the lower layer are respectively composed of a plurality of long strips whose two sides form equilateral angles of 60 degrees with each other. The separator (11) is connected to the outer wall of the mixing tank (8).

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