Fenton advanced catalytic oxidation system for sewage treatment

Abstract

The utility model discloses a kind of fenton advanced catalytic oxidation systems for sewage treatment, it is related to the technical field of sewage treatment, the fenton advanced catalytic oxidation system for sewage treatment includes oxidation tower main body, multiple ultraviolet light catalytic components and water inlet pump, multiple ultraviolet light catalytic components are connected with oxidation tower main body by conduit, the water outlet end of water inlet pump is connected with three conduits.The utility model in ultraviolet light catalysis and fenton catalytic oxidation are combined, inhibit organic matter broken chain decomposition intermediate product and iron salt catalyst chelation, stimulate free radical chain reaction, to eliminate intermediate free radical product and the chelation of iron salt catalyst, iron oxygen intermediate produced in fenton oxidation process is attached on the surface of solid phase carrier, forms solid phase catalyst layer, slowly release in oxidation tower main body interior, to inhibit the chelation of iron salt and organic matter free radical and catalyst.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, specifically a Fenton advanced catalytic oxidation system for wastewater treatment. Background Technology

[0002] The Fenton advanced oxidation process utilizes ferrous ions to catalyze the reaction of hydrogen peroxide under acidic conditions, generating hydroxyl radicals that attack organic pollutants in wastewater, resulting in a chain decomposition reaction. The oxidation potential of hydroxyl radicals reaches 2.8V, second only to fluorine, which can directly cause mineralization of organic matter. The prerequisite for the Fenton reaction is the decomposition of hydrogen peroxide catalyzed by ferrous ions.

[0003] However, the intermediate products generated during the Fenton oxidation decomposition of organic matter are prone to chelating with ferrous ions and active iron ions, making it difficult for the Fenton reaction to proceed completely and thus affecting the wastewater treatment effect. This ferrous ion chelation system is very stable, making it impossible to separate the iron ions from the reaction system after the reaction, and seriously affecting the operation of subsequent advanced treatment systems. The characteristics of the crown energy groups of large organic molecules that are prone to chain breakage and chelate with ferrous ions or iron ion intermediates are mainly long carbon chain molecules, carbon-carbon double bonds, benzene rings, and cyclic organic compounds.

[0004] Based on this, a Fenton advanced catalytic oxidation system for wastewater treatment is now provided, which can eliminate the drawbacks of existing devices. Utility Model Content

[0005] The purpose of this invention is to provide a Fenton advanced catalytic oxidation system for wastewater treatment, in order to solve the problem in the prior art that the Fenton reaction is difficult to complete, thus affecting the wastewater treatment effect.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A Fenton advanced catalytic oxidation system for wastewater treatment includes an oxidation tower body, multiple ultraviolet photocatalytic components, and an inlet pump. The multiple ultraviolet photocatalytic components are connected to the oxidation tower body via conduits. The outlet of the inlet pump is connected to three conduits, one end of which is connected to a circulating jet pump, a hydrogen peroxide dosing device, and a sulfuric acid dosing device, respectively. The outlet of the circulating jet pump is connected to a Venturi jet injector, and the outlet of the Venturi jet injector is connected to the ultraviolet photocatalytic components via conduits. A return pipe is fixedly installed on one side of the oxidation tower body, and one end of the return pipe is connected to the inlet of the circulating jet pump.

[0008] Based on the above technical solutions, this utility model also provides the following optional technical solutions:

[0009] In one alternative: the feed end of the Venturi jet is connected to a conduit, and one end of the conduit is connected to a ferrous sulfate dosing device.

[0010] In one alternative embodiment: the ultraviolet photocatalytic component includes a photocatalytic channel housing, with an inlet pipe and a first outlet pipe fixedly connected to the outside of the photocatalytic channel housing, and an electrodeless ultraviolet lamp holder fixedly installed inside the photocatalytic channel housing, with a microwave electrodeless ultraviolet lamp installed on one side of the electrodeless ultraviolet lamp holder.

[0011] In one alternative: a water distributor is fixedly installed inside the main body of the oxidation tower, and the first water outlet pipe is connected to the water inlet of the water distributor via a conduit.

[0012] In one alternative: a venting and maintenance port is installed at the bottom of the main body of the oxidation tower, and an oxidation tower maintenance port is installed on one side of the main body of the oxidation tower.

[0013] In one alternative: a baffle plate is installed inside the main body of the oxidation tower and above the water distributor, and a catalyst discharge port is installed on one side of the main body of the oxidation tower and above the maintenance port of the oxidation tower.

[0014] In one alternative: a second outlet pipe is fixedly installed on one side of the main body of the oxidation tower and above the baffle plate.

[0015] In one alternative embodiment: an online instrument box is fixedly installed on the top of the oxidation tower body, and an online pH meter and an online ORP meter are respectively installed on one side of the online instrument box, with the online pH meter and the online ORP meter located inside the oxidation tower body.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] 1. In this utility model, the circulating jet pump draws water from the upper part of the oxidation tower body, and gradually and slowly adds the catalyst through the pump outlet. After mixing with the circulating water and passing through the ultraviolet photocatalytic component to enhance the oxidation effect, the catalyst is circulated back into the oxidation tower body. The number of oxidation cycles can be increased or decreased according to the flow rate of the circulating pump. This process always keeps the oxidant in an excess state, which is conducive to the effective utilization of the catalyst. The auxiliary catalytic effect of the photocatalytic channel can further inhibit the catalyst failure caused by chelation and reduce the amount of catalyst used.

[0018] 2. In this invention, ultraviolet photocatalysis is combined with Fenton catalytic oxidation to inhibit the chelation of intermediate products from the chain decomposition of organic matter with iron salt catalysts and to stimulate free radical chain reactions, thereby eliminating the chelation of intermediate free radical products with iron salt catalysts. The iron-oxygen intermediates generated during the Fenton oxidation process adhere to the surface of the solid support, forming a solid catalyst layer, which is slowly released inside the main body of the oxidation tower, thereby inhibiting the chelation of iron salts and organic free radicals with the catalyst. Under the action of ultraviolet photocatalysis, the conversion of organic intermediate products into free radicals is enhanced, the free radical chain reaction is enhanced, and the oxidation effect is improved. The wavelength of the ultraviolet light source is <220nm, the light radiation intensity is 120W / m3, and the flow channel between each light source is <5cm. The high circulation flow rate allows the wastewater to repeatedly pass through the photocatalytic channel in a turbulent state, which enhances the absorption of ultraviolet light. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0020] Figure 2 This is a schematic diagram of the ultraviolet photocatalytic component structure of this utility model.

[0021] Figure labeling: 1. Oxidation tower body; 2. Ultraviolet photocatalytic component; 21. Photocatalytic channel shell; 22. Electrodeless ultraviolet lamp holder; 23. Microwave electrodeless ultraviolet lamp; 24. Inlet pipe; 25. First outlet pipe; 3. Inlet pump; 4. Circulating jet pump; 5. Ferrous sulfate dosing device; 6. Hydrogen peroxide dosing device; 7. Sulfuric acid dosing device; 8. Venturi jet injector; 9. Vent port; 10. Oxidation tower maintenance port; 11. Catalyst discharge port; 12. Second outlet pipe; 13. Water distributor; 14. Online instrument box; 15. Online pH meter; 16. Online ORP meter; 17. Baffle plate. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0023] In one embodiment, such as Figure 1 and Figure 2As shown, a Fenton advanced catalytic oxidation system for wastewater treatment includes an oxidation tower body 1, multiple ultraviolet photocatalytic components 2, and an inlet pump 3. The multiple ultraviolet photocatalytic components 2 are connected to the oxidation tower body 1 through conduits. The outlet end of the inlet pump 3 is connected to three conduits, one end of which is respectively connected to a circulating jet pump 4, a hydrogen peroxide dosing device 6, and a sulfuric acid dosing device 7. The outlet end of the circulating jet pump 4 is connected to a Venturi jet injector 8, and the outlet end of the Venturi jet injector 8 is connected to the ultraviolet photocatalytic components 2 through a conduit. A return pipe is fixedly installed on one side of the oxidation tower body 1, and one end of the return pipe is connected to the inlet end of the circulating jet pump 4.

[0024] In this embodiment, the wastewater, after removing suspended solids, colloids, floating oil, and emulsified oil, is pumped by the inlet pump 3 into the inlet of the circulating jet pump 4. During this process, pH adjusting agents and oxidants are added with the inlet water via the ferrous sulfate dosing device 5 and the hydrogen peroxide dosing device 6. The outlet of the circulating jet pump 4 is connected to the ultraviolet photocatalytic component 2, and the catalyst is added through the Venturi jet injector 8. The catalyst mixes with the wastewater containing the oxidant and enters the ultraviolet photocatalytic component 2. Under the action of ultraviolet light, the free radical chain reaction is enhanced. The effluent enters the water distributor 13, where it is evenly distributed. The treated wastewater is discharged through the second outlet pipe 12 into the main body of the oxidation tower 1. The circulating jet pump 4 draws water from the top of the main body of the oxidation tower 1 and gradually adds the catalyst through the pump outlet. The catalyst mixes with the circulating water and passes through the ultraviolet photocatalytic component 2 to enhance the oxidation effect. Then it is circulated back into the main body of the oxidation tower 1. The number of cycles can be increased or decreased according to the flow rate of the circulating pump. This process always keeps the oxidant in an excess state, which is conducive to the effective utilization of the catalyst. The auxiliary catalytic effect of the photocatalytic channel can further inhibit the catalyst failure caused by chelation and reduce the amount of catalyst used.

[0025] In one embodiment, such as Figure 1 As shown, the feed end of the Venturi jet injector 8 is connected to a conduit, and one end of the conduit is connected to a ferrous sulfate dosing device 5. The flow rate of ferrous sulfate addition can be controlled by the Venturi jet injector 8, which is convenient to adjust according to the actual treatment situation.

[0026] In one embodiment, such as Figure 1 and Figure 2As shown, the ultraviolet photocatalytic component 2 includes a photocatalytic channel housing 21. An inlet pipe 24 and a first outlet pipe 25 are fixedly connected to the outside of the photocatalytic channel housing 21. An electrodeless ultraviolet lamp holder 22 is fixedly installed inside the photocatalytic channel housing 21. A microwave electrodeless ultraviolet lamp 23 is installed on one side of the electrodeless ultraviolet lamp holder 22. A water distributor 13 is fixedly installed inside the oxidation tower body 1. The first outlet pipe 25 is connected to the inlet end of the water distributor 13 via a conduit. The combination of ultraviolet photocatalysis and Fenton catalytic oxidation inhibits the chelation of intermediate products from the organic chain decomposition with the iron salt catalyst, and excites free radical chain reactions. This process eliminates the chelation between intermediate free radical products and iron salt catalysts. The iron-oxygen intermediates produced during the Fenton oxidation process adhere to the surface of the solid support, forming a solid catalyst layer. This layer is slowly released inside the main body 1 of the oxidation tower, thereby inhibiting the chelation between iron salts and organic free radicals with the catalyst. Under ultraviolet photocatalysis, the conversion of organic intermediate products into free radicals is enhanced, the free radical chain reaction is strengthened, and the oxidation effect is improved. The ultraviolet light source wavelength is <220nm, the light radiation intensity is 120W / m3, and the flow channel between each light source is <5cm. The high circulation flow rate allows the wastewater to repeatedly pass through the photocatalytic channel in a turbulent state, enhancing the absorption of ultraviolet light.

[0027] In one embodiment, such as Figure 1 As shown, a venting and maintenance port 9 is installed at the bottom of the oxidation tower body 1, and an oxidation tower maintenance port 10 is installed on one side of the oxidation tower body 1. The venting and maintenance port 9 and the oxidation tower maintenance port 10 facilitate the maintenance of the oxidation tower body 1.

[0028] In one embodiment, such as Figure 1 As shown, a baffle plate 17 is installed inside the main body 1 of the oxidation tower and above the water distributor 13. A catalyst discharge port 11 is installed on one side of the main body 1 of the oxidation tower and above the maintenance port 10 of the oxidation tower. A second water outlet pipe 12 is fixedly installed on one side of the main body 1 of the oxidation tower and above the baffle plate 17. A packing layer is set inside the main body 1 of the oxidation tower. During the circulation of wastewater containing oxidant and catalyst in the main body 1 of the oxidation tower, the ferrite intermediate catalyst generated crystallizes and accumulates on the surface. The ferrite crystallization on the surface of the packing becomes a catalytic active site, which catalyzes hydrogen peroxide to further convert into free radicals and oxidizes organic matter in the wastewater. Iron salt catalyst is deposited on the crystal surface and converted into an accumulated catalyst. The catalyst is separated from water by the baffle plate 17. When there is too much catalyst, it is discharged through the catalyst discharge port 11, which reduces the amount of iron salt sludge generated and reduces the cost of sludge treatment. At the same time, the catalyst can be sold externally as a resource.

[0029] In one embodiment, such as Figure 1As shown, an online instrument box 14 is fixedly installed on the top of the oxidation tower body 1. An online pH meter 15 and an online ORP meter 16 are respectively installed on one side of the online instrument box 14, and the online pH meter 15 and the online ORP meter 16 are located inside the oxidation tower body 1. The online ORP meter 16 measures the oxidation-reduction potential of the tailwater of the oxidation tower body 1 and controls the oxidation-reduction potential between 300-500mV to automatically adjust the hydrogen peroxide dosage. During the catalytic oxidation process, the organic wastewater will produce small molecule acids, and the pH inside the oxidation tower body 1 will decrease accordingly. Therefore, the acid dosage is adjusted according to the pH value of the tailwater of the oxidation tower body 1 measured by the online pH meter 15 installed on the top of the oxidation tower body 1, and the pH inside the reactor is controlled between 3.5-4.5 to automatically adjust the acid dosage.

[0030] The working principle of this invention is as follows: Wastewater, after removing suspended solids, colloids, floating oil, and emulsified oil, is pumped by inlet pump 3 into the inlet of circulating jet pump 4. During this process, pH adjusting agent and oxidant are added with the inlet water via ferrous sulfate dosing device 5 and hydrogen peroxide dosing device 6. The outlet of circulating jet pump 4 is connected to ultraviolet photocatalytic component 2. The catalyst is added through Venturi jet 8 and mixed with the wastewater containing oxidant before entering ultraviolet photocatalytic component 2. Under the action of ultraviolet light, the free radical chain reaction is enhanced. The effluent enters water distributor 13 and is evenly distributed into the main body of oxidation tower 1 to achieve the desired pH and O2 levels. The water at the top of the oxidation tower with the RP value reacts with the water at the sewage inlet, which is necessary for the circulation water. Excess water is discharged through the second outlet pipe 12. The circulating jet pump 4 draws water from the top of the oxidation tower body 1 and gradually adds the catalyst through the pump outlet. After mixing with the circulating water and passing through the ultraviolet photocatalytic component 2 to enhance the oxidation effect, the water is circulated back into the oxidation tower body 1. The number of oxidation cycles can be increased or decreased according to the flow rate of the circulating pump. This process always keeps the oxidant in an excess state, which is conducive to the effective utilization of the catalyst. The auxiliary catalytic effect of the photocatalytic channel can further inhibit the catalyst failure caused by chelation and reduce the amount of catalyst used.

[0031] The online ORP meter 16 measures the oxidation-reduction potential of the tailwater in the main body 1 of the oxidation tower, and controls the oxidation-reduction potential between 300-500mV. The amount of hydrogen peroxide added is automatically adjusted. During the catalytic oxidation process, the organic wastewater will produce small molecule acids, and the pH in the main body 1 of the oxidation tower will decrease accordingly. Therefore, the amount of acid added is adjusted according to the pH value of the tailwater in the main body 1 of the oxidation tower, which is measured by the online pH meter 15 installed at the top of the main body 1 of the oxidation tower. The pH in the reactor is controlled between 3.5-4.5, and the amount of acid added is automatically adjusted.

[0032] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A Fenton advanced catalytic oxidation system for wastewater treatment, comprising an oxidation tower body (1), multiple ultraviolet photocatalytic components (2), and an influent pump (3), characterized in that, Multiple ultraviolet photocatalytic components (2) are connected to the main body of the oxidation tower (1) through conduits. The outlet of the water pump (3) is connected to three conduits. One end of each of the three conduits is connected to a circulating jet pump (4), a hydrogen peroxide dosing device (6), and a sulfuric acid dosing device (7). The outlet of the circulating jet pump (4) is connected to a Venturi jet injector (8). The outlet of the Venturi jet injector (8) is connected to multiple ultraviolet photocatalytic components (2) through conduits. A return pipe is fixedly installed on one side of the main body of the oxidation tower (1). One end of the return pipe is connected to the inlet of the circulating jet pump (4).

2. The Fenton advanced catalytic oxidation system for wastewater treatment according to claim 1, characterized in that, The feed end of the Venturi jet (8) is connected to a conduit, and one end of the conduit is connected to a ferrous sulfate dosing device (5).

3. The Fenton advanced catalytic oxidation system for wastewater treatment according to claim 1, characterized in that, The ultraviolet photocatalytic component (2) includes a photocatalytic channel housing (21), with an inlet pipe (24) and a first outlet pipe (25) fixedly connected to the outside of the photocatalytic channel housing (21), and an electrodeless ultraviolet lamp holder (22) fixedly installed inside the photocatalytic channel housing (21), with a microwave electrodeless ultraviolet lamp (23) installed on one side of the electrodeless ultraviolet lamp holder (22).

4. The Fenton advanced catalytic oxidation system for wastewater treatment according to claim 3, characterized in that, The oxidation tower body (1) is fixedly installed with a water distributor (13), and the first water outlet pipe (25) is connected to the water inlet of the water distributor (13) through a conduit.

5. The Fenton advanced catalytic oxidation system for wastewater treatment according to claim 4, characterized in that, The bottom of the oxidation tower body (1) is equipped with a venting and maintenance port (9), and the side of the oxidation tower body (1) is equipped with an oxidation tower maintenance port (10).

6. The Fenton advanced catalytic oxidation system for wastewater treatment according to claim 5, characterized in that, A baffle plate (17) is installed inside the main body (1) of the oxidation tower and above the water distributor (13). A catalyst discharge port (11) is installed on one side of the main body (1) of the oxidation tower and above the oxidation tower inspection port (10).

7. The Fenton advanced catalytic oxidation system for wastewater treatment according to claim 6, characterized in that, A second water outlet pipe (12) is fixedly installed on one side of the main body (1) of the oxidation tower and above the baffle plate (17).

8. The Fenton advanced catalytic oxidation system for wastewater treatment according to claim 1, characterized in that, An online instrument box (14) is fixedly installed on the top of the oxidation tower body (1). An online pH meter (15) and an online ORP meter (16) are respectively installed on one side of the online instrument box (14), and the online pH meter (15) and the online ORP meter (16) are located inside the oxidation tower body (1).

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