Photocatalysis coupling electro-Fenton equipment suitable for treating high-difficulty wastewater
The photocatalytic coupled electro-Fenton device addresses high-concentration wastewater treatment challenges by in-situ hydrogen peroxide production and iron recycling, enhancing efficiency and reducing costs and sludge output.
Patent Information
- Application Number
- CN202420985600.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-08
- Publication Date
- 2024-12-24
- Estimated Expiration
- 2034-05-08
AI Technical Summary
Existing advanced oxidation processes for treating high-concentration and difficult-to-degrade wastewater face challenges such as high operating costs, material expenses, low hydrogen peroxide output, inefficient iron reduction, and complex pH adjustments, leading to secondary pollution and increased sludge output.
A photocatalytic coupled electro-Fenton device with a reaction box divided into zones, utilizing a diffusion cathode, an anode, photocatalytic device, and aeration, which produces hydrogen peroxide in-situ and recycles iron, reducing the need for external reagents and minimizing sludge production.
The device achieves efficient degradation of organic pollutants with reduced chemical usage, minimal sludge output, and no secondary pollution, while maintaining strong oxidation ability and cost-effectiveness.
Smart Images
Figure CN222226138U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of sewage treatment equipment, in particular to a photocatalytic coupled electro-Fenton device suitable for treating highly difficult wastewater. Background Art
[0002] At present, advanced oxidation processes are generally used to treat high-concentration and difficult-to-degrade wastewater. Common advanced oxidation processes include ozone, Fenton, electrochemistry, and combinations of the above processes. However, due to the complex sources of wastewater, various advanced oxidation processes have certain application limitations. Electro-Fenton is an electrochemical advanced oxidation technology, the core of which is to mineralize organic pollutants and their intermediates into water and carbon dioxide by producing hydroxyl radicals. Compared with traditional Fenton technology, electro-Fenton advanced oxidation technology has the following advantages: the electro-Fenton method can realize the in-situ production of H2O2, greatly reducing the use of chemical agents, reducing the cost of sewage treatment, and avoiding the risks of H2O2 in transportation and storage; the reaction is relatively thorough, Fe 2+ The cathode can be regenerated and recycled, which reduces the output of iron sludge, almost eliminates secondary pollution, and simplifies post-processing.
[0003] The existing technology for treating difficult wastewater has the following technical problems: First, ozone can oxidize most organic matter, especially those that are difficult to degrade, with good results, and is known for its high efficiency and no secondary pollution. However, the operating cost of ozone oxidation is relatively high. Although ozone has extremely strong oxidizing properties, it is highly selective and only works on some pollutants. Secondly, the electrode materials of general electro-Fenton technology are expensive; the H2O2 output is low, and Fe 3+ Reduction to Fe 2+ Low efficiency; tedious pH adjustment process and other problems. Utility Model Content
[0004] The purpose of the utility model is to provide a photocatalytic coupled electro-Fenton device suitable for treating high-difficulty wastewater, so as to solve the technical problems existing in the prior art.
[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a photocatalytic coupled electro-Fenton device suitable for treating high-difficulty wastewater, comprising a reaction box, a power supply, a lifting pump, a dosing metering pump and a sludge diaphragm pump, the interior of the reaction box is divided into an electro-Fenton-photocatalytic reaction zone, a flocculation sedimentation tank and a water outlet zone which are connected in sequence by a partition, the electro-Fenton-photocatalytic reaction zone is connected to the lifting pump by a pipeline, the electro-Fenton-photocatalytic reaction zone is connected to the dosing metering pump by a pipeline, the water outlet zone is connected to the sludge diaphragm pump, a diffusion cathode and an anode are arranged in the electro-Fenton-photocatalytic reaction zone, the diffusion cathode and the anode are electrically connected to the cathode and anode of the power supply respectively, the electro-Fenton-photocatalytic reaction zone is also provided with a photocatalytic device and an aeration device, the flocculation sedimentation tank is also connected to the PAM metering pump and the PH alkali adjustment metering pump by a pipeline, and the flocculation sedimentation tank and the electro-Fenton-photocatalytic reaction zone are also connected by a circulation pump and a pipeline.
[0006] Through the above technical scheme, the wastewater is transported to the electro-Fenton-photocatalytic reaction zone by a lifting pump, and the sewage enters the flocculation sedimentation tank after the electro-Fenton-photocatalytic treatment in the electro-Fenton-photocatalytic reaction zone, and the neutralization reaction is carried out in the flocculation sedimentation tank. Part of the iron sludge in the sewage is precipitated in the flocculation sedimentation tank. The circulation pump circulates the sewage in the Fenton-photocatalytic reaction zone and the flocculation sedimentation tank to make the reaction more complete, and the pH is adjusted to weak alkalinity by a pH alkali adjustment metering pump, and an appropriate amount of PAM is added by a PAM metering pump. The neutralized sewage is flocculated and precipitated in the outlet area, and the clean water above is discharged, and the sludge at the bottom is discharged by a sludge diaphragm pump.
[0007] A further solution of the utility model is that the diffusion cathode is an activated carbon diffusion cathode, the diffusion cathode is horizontally arranged on the left side of the electro-Fenton-photocatalytic reaction zone, the anode electrode is an iron plate, and the iron plates of multiple anode electrodes are vertically and evenly arranged on the right side of the diffusion cathode. The anode and cathode electrodes in the electro-Fenton-photocatalytic reaction zone are powered by a power supply, and the reaction rate can be adjusted by adjusting the voltage or current. When the power supply mode is set to a constant voltage mode, the voltage applied to the cathode is 0.1-5V; when it is set to a constant current mode, the current density applied is 0.1-100mA / cm 2 .
[0008] A further solution of the utility model is that the photocatalytic device comprises an ultraviolet lamp tube and a power supply arranged in the electro-Fenton-photocatalytic reaction zone, and the ultraviolet lamp tube and the power supply are electrically connected.
[0009] A further solution of the utility model is that the ultraviolet lamp tube is arranged on the first partition plate of the reaction box.
[0010] A further solution of the utility model is that the aeration device comprises an aeration pipe arranged inside the electro-Fenton-photocatalytic reaction zone and an air compressor arranged outside the reaction box, and the aeration pipe and the air compressor are connected.
[0011] A further solution of the utility model is that the aeration pipe is a plurality of circular pipes arranged in parallel, a plurality of air outlets are evenly distributed on the circular pipes, and the plurality of circular pipes are evenly distributed at the bottom of the electro-Fenton-photocatalytic reaction zone.
[0012] Through the above technical scheme, sewage is in the electro-Fenton-photocatalytic reaction zone, under acidic (PH3-6) conditions, the diffusion cathode and the anode are catalyzed by a DC power supply and an ultraviolet lamp, aeration is carried out at the bottom and the surface of the diffusion cathode through an aeration pipe, oxygen obtains electrons at the diffusion cathode to produce H2O2, the iron plate of the anode electrolytically oxidizes and dissolves iron to produce divalent iron ions, and an electro-Fenton reaction occurs in the electro-Fenton-photocatalytic reaction zone, COD is degraded by producing a large number of hydroxyl free radicals, and the oxidized trivalent iron is cyclically reduced to divalent iron under the catalytic action of the cathode and ultraviolet light, saving the addition of FeSO4·7H2O and H2O2 reagents and reducing the amount of iron sludge produced.
[0013] A further solution of the utility model is that the electro-Fenton-photocatalytic reaction zone is connected to the flocculation sedimentation tank through a first overflow weir arranged above the first partition, and the flocculation sedimentation tank is connected to the water outlet zone through a second overflow weir arranged on the second partition.
[0014] A further solution of the utility model is that a water outlet weir is arranged on the inner wall of the reaction box above the water outlet area, and the supernatant in the water outlet area flows out from the water outlet weir.
[0015] Compared with the prior art, the beneficial effects of the utility model are:
[0016] The positive electrode of the utility model device is an iron electrode, and the cathode is a special diffusion cathode (i.e., an activated carbon diffusion cathode). The air compressor is used to aerate the surface and bottom of the diffusion cathode, and oxygen is continuously electrolyzed at the cathode to produce H2O2. The iron electrode electrolytically oxidizes and dissolves iron to produce divalent iron ions, Fe 2+ It does not require a large amount of catalyst to be added, the reaction conditions are mild, and the oxidation ability is strong; the oxidized trivalent iron is continuously reduced to divalent iron under the catalytic action of the diffusion cathode and ultraviolet light, which saves the addition of H2O2, FeSO4·7H2O and other reagents and saves costs; the output of waste gas and iron slag sludge during the reaction is very small, there is no secondary pollution, and it is easy to handle. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0018] Figure 1 This is a schematic diagram of the structure of a photocatalytic coupled electro-Fenton device suitable for treating high-difficulty wastewater according to the utility model.
[0019] In the figure: 1. power supply; 2. lifting pump; 3. air compressor; 4. aeration pipe; 5. circulation pump; 6. sludge diaphragm pump; 7. PAM metering pump; 8. dosing metering pump; 9. pH alkali adjustment metering pump; 10. electro-Fenton-photocatalytic reaction zone; 11. flocculation sedimentation tank; 12. UV lamp; 13. outlet zone; 14. diffusion cathode; 15. anode; 16. outlet weir; 17. first overflow weir; 18. reaction box; 19. first partition; 20. second overflow weir; 21. second partition. DETAILED DESCRIPTION
[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0021] In the present invention, "front", "back", "left", "right", "inside" and "outside" only represent relative position relationships. When the absolute position of the described object changes, the relative position relationship may also change accordingly.
[0022] Example 1
[0023] like Figure 1 As shown, a photocatalytic coupled electro-Fenton device suitable for treating difficult wastewater includes a reaction box 18, a power supply 1, a lifting pump 2, a dosing metering pump 8 and a sludge diaphragm pump 6. The interior of the reaction box 18 is divided into an electro-Fenton-photocatalytic reaction zone 10, a flocculation sedimentation tank 11 and a water outlet zone 13 which are connected in sequence by a partition.
[0024] The electro-Fenton-photocatalytic reaction zone 10 is connected to the lifting pump 2 through a pipeline, the pipeline of the lifting pump 2 is connected to the bottom of the electro-Fenton-photocatalytic reaction zone 10, the electro-Fenton-photocatalytic reaction zone 10 is connected to the dosing metering pump 8 through a pipeline, the water outlet zone 13 is connected to the sludge diaphragm pump 6, the electro-Fenton-photocatalytic reaction zone 10 is provided with a diffusion cathode 14 and an anode 15, the pipeline of the dosing metering pump 8 is connected near the diffusion cathode 14 of the electro-Fenton-photocatalytic reaction zone 10, and the diffusion cathode 14 and the anode 15 are electrically connected to the cathode and anode of the power supply 1 respectively. The electro-Fenton-photocatalytic reaction zone 10 is also provided with a photocatalytic device and an aeration device. The flocculation sedimentation tank 11 is also connected to the PAM metering pump 7 and the pH alkali adjustment metering pump 9 through a pipeline, and the flocculation sedimentation tank 11 and the electro-Fenton-photocatalytic reaction zone 10 are also connected through a circulation pump 5 and a pipeline.
[0025] The specific technical scheme for realizing the photocatalytic-electro-Fenton reaction is as follows: the diffusion cathode 14 is an activated carbon diffusion cathode, the diffusion cathode 14 is horizontally arranged on the left side of the electro-Fenton-photocatalytic reaction zone 10, the anode electrode 15 is an iron plate, and the iron plates of multiple anode electrodes 15 are vertically and evenly arranged on the right side of the diffusion cathode 14. The anode and cathode electrodes 15 in the electro-Fenton-photocatalytic reaction zone 10 are powered by a power supply 1, and the reaction rate can be adjusted by adjusting the voltage or current. When the power supply mode is set to a constant voltage mode, the voltage applied to the cathode is 0.1 to 5V; when set to a constant current mode, the applied current density is 0.1 to 100mA / cm2.
[0026] The photocatalytic device includes an ultraviolet lamp 12 and a power supply 1 arranged in the electro-Fenton-photocatalytic reaction zone 10, and the ultraviolet lamp 12 is electrically connected to the power supply 1. The ultraviolet lamp 12 is arranged on the first partition 19 of the reaction box 18. The aeration device includes an aeration pipe 4 arranged inside the electro-Fenton-photocatalytic reaction zone 10 and an air compressor 3 arranged outside the reaction box 18, and the aeration pipe 4 is connected to the air compressor 3.
[0027] Specifically, the aeration tube 4 is a plurality of circular tubes arranged in parallel, a plurality of air outlet holes are evenly distributed on the circular tubes, and the plurality of circular tubes are evenly distributed at the bottom of the electro-Fenton-photocatalytic reaction zone 10 .
[0028] The specific technical scheme for achieving the connection between each partition is as follows: the electro-Fenton-photocatalytic reaction zone 10 is connected to the flocculation sedimentation tank 11 through a first overflow weir 17 arranged above the first partition 19, the flocculation sedimentation tank 11 is connected to the water outlet zone 13 through a second overflow weir 20 arranged on the second partition 21, the pipelines of the PAM metering pump 7 and the pH alkali adjustment metering pump 9 are connected above the second overflow weir 20, and alkali solution and flocculant are added to the first overflow weir 17 of the flocculation sedimentation tank 11 to prevent the circulation pump 5 from circulating iron sludge to the electro-Fenton-photocatalytic reaction zone 10.
[0029] A water outlet weir 16 is provided on the inner wall of the reaction box 18 above the water outlet area 13. The supernatant in the water outlet area 13 flows out from the water outlet weir 16, and the generated sludge is discharged through the sludge diaphragm pump 6 for drying or concentration treatment.
[0030] How it works:
[0031] The wastewater is transported to the electro-Fenton-photocatalytic reaction zone 10 by the lifting pump 2. In the electro-Fenton-photocatalytic reaction zone 10, the wastewater is catalyzed by the DC power supply 1 and the ultraviolet lamp 12 under acidic (PH3-6) conditions on the diffusion cathode 14 and the anode 15. Aeration is performed at the bottom and on the surface of the diffusion cathode 14 through the aeration pipe 4. Oxygen obtains electrons at the diffusion cathode 14 to produce H2O2. The iron plate of the anode 15 electrolytically oxidizes and dissolves iron to produce divalent iron ions. An electro-Fenton reaction occurs in the electro-Fenton-photocatalytic reaction zone 10, and COD is degraded by producing a large amount of hydroxyl free radicals. The oxidized trivalent iron is cyclically reduced to divalent iron under the catalytic action of the cathode and ultraviolet light, thereby saving the addition of FeSO4·7H2O and H2O2 reagents and reducing the amount of iron sludge produced. After the sewage is treated by electro-Fenton-photocatalytic treatment in the electro-Fenton-photocatalytic reaction zone 10, it enters the flocculation sedimentation tank, where a neutralization reaction is carried out. Part of the iron sludge in the sewage is precipitated in the flocculation sedimentation tank. The circulation pump 5 circulates the sewage in the Fenton-photocatalytic reaction zone and the flocculation sedimentation tank 11 to make the reaction more complete. The pH is adjusted to weak alkalinity by the PH alkali adjustment metering pump 9, and an appropriate amount of PAM is added by the PAM metering pump 7. The neutralized sewage is flocculated and precipitated in the outlet area 13, and the clean water above is discharged, and the sludge at the bottom is discharged through the sludge diaphragm pump 6.
[0032] The positive electrode 15 of the utility model device is an iron electrode, and the cathode is a special diffusion cathode 14 (i.e., an activated carbon diffusion cathode). The air compressor 3 is used to aerate the surface and bottom of the diffusion cathode 14, and oxygen is continuously electrolyzed at the cathode to produce H2O2. The iron electrode electrolytically oxidizes and dissolves iron to produce divalent iron ions, Fe 2+There is no need to add a large amount of catalyst, the reaction conditions are mild, and the oxidation ability is strong; the oxidized trivalent iron is cyclically and continuously reduced to divalent iron under the catalytic action of the diffusion cathode 14 and ultraviolet light, which saves the addition of H2O2, FeSO4·7H2O and other reagents and saves costs; the output of waste gas and iron slag sludge during the reaction is very small, there is no secondary pollution, and it is easy to handle.
[0033] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.
Claims
1. A photocatalytic coupled electro-Fenton device suitable for treating difficult wastewater, characterized in that: The invention comprises a power source (1), a lifting pump (2), a reaction box (18), a dosing metering pump (8) and a sludge diaphragm pump (6); the reaction box (18) comprises an electro-Fenton-photocatalytic reaction zone (10), a flocculation sedimentation tank (11) and a water outlet zone (13) which are connected in sequence; the electro-Fenton-photocatalytic reaction zone (10) is connected to the lifting pump (2); the electro-Fenton-photocatalytic reaction zone (10) is connected to the dosing metering pump (8); the water outlet zone (13) is connected to the sludge diaphragm pump (6); the electro-Fenton A diffusion cathode (14) and an anode (15) are arranged in the photocatalytic reaction zone (10), and the diffusion cathode (14) and the anode (15) are electrically connected to the cathode and anode of the power supply (1) respectively. The electro-Fenton-photocatalytic reaction zone (10) is also provided with a photocatalytic device and an aeration device. The flocculation sedimentation tank (11) is also connected to a PAM metering pump (7) and a pH alkali adjustment metering pump (9). The flocculation sedimentation tank (11) and the electro-Fenton-photocatalytic reaction zone (10) are also connected via a circulation pump (5).
2. A photocatalytic coupled electro-Fenton device suitable for treating difficult wastewater according to claim 1, characterized in that: The diffusion cathode (14) is an activated carbon diffusion cathode, and the diffusion cathode (14) is horizontally arranged on the left side of the electro-Fenton-photocatalytic reaction zone (10). The anode electrode (15) is an iron plate, and the iron plates of multiple anode electrodes (15) are vertically evenly arranged on the right side of the diffusion cathode (14).
3. A photocatalytic coupled electro-Fenton device suitable for treating difficult wastewater according to claim 2, characterized in that: The photocatalytic device comprises an ultraviolet lamp tube (12) and a power source (1) arranged in an electro-Fenton-photocatalytic reaction zone (10); the ultraviolet lamp tube (12) and the power source (1) are electrically connected.
4. A photocatalytic coupled electro-Fenton device suitable for treating difficult wastewater according to claim 3, characterized in that: The ultraviolet lamp tube (12) is arranged on the first partition plate (19) of the reaction box (18).
5. A photocatalytic coupled electro-Fenton device suitable for treating difficult wastewater according to claim 4, characterized in that: The aeration device comprises an aeration pipe (4) arranged inside the electro-Fenton-photocatalytic reaction zone (10) and an air compressor (3) arranged outside the reaction box (18), and the aeration pipe (4) and the air compressor (3) are connected.
6. A photocatalytic coupled electro-Fenton device suitable for treating difficult wastewater according to claim 5, characterized in that: The aeration tube (4) is a plurality of circular tubes arranged in parallel, a plurality of air outlet holes are evenly distributed on the circular tubes, and the plurality of circular tubes are evenly distributed at the bottom of the electro-Fenton-photocatalytic reaction zone (10).
7. A photocatalytic coupled electro-Fenton device suitable for treating difficult wastewater according to any one of claims 1 to 6, characterized in that: The electro-Fenton-photocatalytic reaction zone (10) is connected to the flocculation sedimentation tank (11) via a first overflow weir (17) arranged above the first partition (19), and the flocculation sedimentation tank (11) is connected to the water outlet zone (13) via a second overflow weir (20) arranged on the second partition (21).
8. A photocatalytic coupled electro-Fenton device suitable for treating difficult wastewater according to any one of claims 1 to 6, characterized in that: A water outlet weir (16) is arranged above the water outlet area (13).