Multi-cathode sewage electro-Fenton treatment device

Abstract

The utility model provides a multi-cathode sewage electro-Fenton treatment device. The multi-cathode sewage electro-Fenton treatment device is characterized in that a water inlet, a water outlet, an exhaust port and a feed opening are formed in a reaction tank; the other part of the aeration assembly extends into the reaction tank; the graphite plate assembly is mounted in the reaction tank and is positioned above the aeration assembly; the power supply assembly is electrically connected with the graphite plate assembly; and sewage is introduced into the reaction tank through the water inlet. A graphite plate assembly and an aeration assembly are installed in a reaction tank pipe, after sewage is added into a reaction tank, acid-base is added firstly to adjust the pH value, then sodium sulfate and ferrous iron are added, and a mixed solution is obtained; then oxygen is accumulated on the graphite plate assembly through the aeration assembly to efficiently generate hydrogen peroxide, the hydrogen peroxide and ferrous iron in the mixed solution are subjected to a Fenton reaction to generate a strong oxidizing free radical-hydroxyl free radical, the mixed solution is driven by aeration to flow, and the hydroxyl free radical is promoted to more efficiently degrade organic pollutants.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewage treatment, and particularly relates to a multi-cathode sewage electro-Fenton treatment device. Background Art

[0002] The electro-Fenton technology is a very efficient method for degrading organic pollutants in water bodies. The working principle of the electro-Fenton wastewater treatment technology is to use strongly oxidizing hydroxyl radicals to oxidize and treat wastewater, adopting a technology that combines electrochemistry and Fenton technology. O 2 On the cathode, through a two-electron reduction reaction, it is reduced to H 2 O 2 . H 2 O 2 Reacts with Fe 2+ to generate ·OH and Fe 3 + , ·OH has strong oxidizing property and can oxidize organic pollutants. This technology has the advantages of rapid reaction, cleanliness and environmental protection. And the generation rate of ·OH depends on the generation rate of H 2 O 2 . However, in the electro-Fenton technology, the distribution and diffusion of gas on the cathode have a significant impact on the generation of H 2 O 2 , and the mass transfer difficulty of oxygen at the three-phase interface leads to a low hydrogen peroxide yield. The efficiency of in-situ hydrogen peroxide generation in traditional electro-Fenton technology is not high and needs to be carried out under strong acidic conditions, otherwise it is easy to produce iron sludge hazardous waste.

[0003] Therefore, it is necessary to develop a sewage electro-Fenton treatment device that can efficiently produce hydrogen peroxide and reduce the generation of iron sludge hazardous waste. Summary of the Utility Model

[0004] The embodiment of the present application provides a multi-cathode sewage electro-Fenton treatment device to solve the problems existing in the related technology. The technical solution is as follows:

[0005] The embodiment of the present application provides a multi-cathode sewage electro-Fenton treatment device, including:

[0006] A reaction tank, which is provided with a water inlet, a water outlet, an exhaust port and a feeding port;

[0007] An aeration assembly, a part of which is installed outside the reaction tank, and another part of which extends into the reaction tank;

[0008] A graphite plate assembly, which is installed inside the reaction tank and is located above the aeration assembly;

[0009] A power supply component, which is electrically connected to the graphite plate component;

[0010] Among them, sewage is introduced into the reaction tank through the water inlet and submerges the aeration component, the graphite plate component, and part of the power supply component.

[0011] In one embodiment, it further includes:

[0012] A base, on which the reaction tank is installed, and the part of the aeration component located outside the reaction tank is installed on the base.

[0013] In one embodiment, it further includes:

[0014] A feeding box, which is installed on the reaction tank and is in communication with the inside of the reaction tank.

[0015] In one embodiment,

[0016] The aeration component includes:

[0017] An aeration pump, which is installed on the base and is electrically connected to the power supply component;

[0018] An aeration pipe, one end of which is connected to the aeration pump and the other end extends into the reaction tank;

[0019] An aeration disc, which is installed inside the reaction tank, is connected to one end of the aeration pipe located inside the reaction tank, and the aeration disc has a number of aeration holes.

[0020] In one embodiment,

[0021] The graphite plate component includes: a first graphite plate, a second graphite plate, and a third graphite plate. The first graphite plate, the second graphite plate, and the third graphite plate are sequentially and fixedly installed inside the reaction tank along the direction from the top to the bottom of the reaction tank. The first graphite plate, the second graphite plate, and the third graphite plate are all provided with holes.

[0022] In one embodiment,

[0023] The power supply component includes:

[0024] An external power supply, which is installed on the top of the reaction tank. The first graphite plate, the second graphite plate, and the third graphite plate are all electrically connected to the negative electrode of the external power supply. The external power supply is also electrically connected to the aeration pump;

[0025] The reticulated ruthenium-iridium-titanium electrode is installed in the reaction tank. The reticulated ruthenium-iridium-titanium electrode is located above the first graphite plate and is electrically connected to the positive pole of the external power supply.

[0026] In one embodiment,

[0027] The bottom lower wall of the reaction tank is inclined, and the discharge port is located at the lowest end of the reaction tank.

[0028] In one embodiment,

[0029] Electromagnetic valves are installed at the water inlet, water outlet and exhaust port.

[0030] In one embodiment, it further includes:

[0031] The iron sludge storage bin is detachably installed on the base. The iron sludge storage bin is communicated with the discharge port, and a valve is installed on the discharge port.

[0032] In one embodiment,

[0033] The feeding box is divided into four compartments, and a ferrous ion solution, sodium sulfate, acid and alkali are stored in the four compartments respectively.

[0034] The sewage treatment device provided by the present utility model has the following beneficial effects:

[0035] By installing a graphite plate assembly and an aeration assembly in the reaction tank pipe, after adding sewage into the reaction tank, first add acid and alkali to adjust the pH, then add sodium sulfate and ferrous ions to form a mixed solution. The aeration assembly accumulates oxygen on the graphite plate assembly to efficiently generate hydrogen peroxide. The hydrogen peroxide reacts with ferrous ions in the mixed solution to undergo a Fenton reaction to generate strongly oxidizing free radicals - hydroxyl radicals. The aeration drives the flow of the mixed solution, promoting the more efficient degradation of organic pollutants by hydroxyl radicals;

[0036] This device uses a graphite plate assembly as the cathode, which has a large surface area, can increase the contact area between oxygen and the cathode and improve the hydrogen peroxide production, and at the same time significantly enhance the reduction of Fe 3+ and realize the recycling of Fe 2+ and reduce the generation of iron sludge hazardous waste. It is a new type of electro-Fenton treatment device that can efficiently treat polluted wastewater.

[0037] The above summary is only for the purpose of the specification and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features of the present application will be readily apparent by reference to the drawings and the following detailed description. Description of the Drawings

[0038] In the drawings, unless otherwise specified, the same reference numerals throughout the several views denote the same or similar components or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in the present application and should not be regarded as limiting the scope of the present application.

[0039] Figure 1 It is a schematic structural diagram of the present utility model;

[0040] Figure 2 is Figure 1 a schematic structural diagram of the holes on the first graphite plate, the second graphite plate and the third graphite plate in

[0041] In the figure: 1, reaction tank; 2, base; 3, aeration assembly; 31, aeration disk; 32, aeration pipe; 33, aeration pump; 4, reticulated ruthenium-iridium-titanium electrode; 5, graphite plate assembly; 51, first graphite plate; 52, second graphite plate; 53, third graphite plate; 54, hole; 6, external power supply; 7, feeding box; 8, discharging port; 9, valve; 10, iron sludge storage bin; 11, water inlet; 12, water outlet; 13, exhaust port. Detailed Embodiments

[0042] In the following, only some exemplary embodiments are briefly described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present application. Therefore, the drawings and the description are considered to be exemplary in nature and not restrictive.

[0043] Figure 1 - Figure 2 It shows a structural diagram of a multi-cathode sewage electro-Fenton treatment device according to an embodiment of the present application. As Figure 1 - Figure 2 shown, the treatment device may include:

[0044] A reaction tank 1, on which a water inlet 11, a water outlet 12, an exhaust port 13 and a discharging port 8 are provided;

[0045] An aeration assembly 3, a part of which is installed outside the reaction tank 1 and another part extends into the reaction tank 1;

[0046] A graphite plate assembly 5, which is installed inside the reaction tank 1 and is located above the aeration assembly 3;

[0047] A power supply assembly, which is electrically connected to the graphite plate assembly 5;

[0048] Among them, sewage is introduced into the reaction tank 1 through the water inlet 11 and submerges the aeration component 3, the graphite plate component 5, and part of the power supply component.

[0049] Base 2, the reaction tank 1 is installed on the base 2, and the part of the aeration component 3 located outside the reaction tank 1 is installed on the base 2.

[0050] In this embodiment, sewage enters the reaction tank 1 from the water inlet 11. After the sewage submerges the graphite plate component 5 and part of the power supply component, close the water inlet 11, add acid and alkali to the reaction tank 1 to adjust the pH, then add sodium sulfate and ferrous iron, turn on the aeration component 3 and the power supply component. Oxygen accumulates on the graphite plate component 5 through the aeration component 3, and hydrogen peroxide is efficiently generated through the graphite plate component 5. It undergoes a Fenton reaction with ferrous iron in the solution to generate strongly oxidizing free radicals - hydroxyl radicals. The mixing liquid is driven by aeration, which promotes the more efficient degradation of organic pollutants by hydroxyl radicals. The pollutants in the water body are rapidly degraded through the electro-Fenton reaction, and clean water will be obtained at the water outlet 12. The gas that does not participate in the two-electron reduction and the mineralized CO 2 will be discharged through the exhaust port 13;

[0051] By installing the graphite plate component 5 and the aeration component 3 in the reaction tank 1, after adding sewage to the reaction tank 1, first add acid and alkali to adjust the pH, then add sodium sulfate and ferrous iron to obtain a mixed liquid; then the oxygen is accumulated on the graphite plate component 5 through the aeration component 3 to efficiently generate hydrogen peroxide. Hydrogen peroxide undergoes a Fenton reaction with ferrous iron in the solution to generate strongly oxidizing free radicals - hydroxyl radicals. The mixing liquid is driven by aeration, which promotes the more efficient degradation of organic pollutants by hydroxyl radicals. At the same time, the graphite plate component 5 has a large surface area as the cathode, which can significantly enhance the reduction of Fe 3+ to generate Fe 2+ which then participates in the Fenton reaction again to achieve the recycling of Fe 2+ and reduce the generation of iron sludge hazardous waste.

[0052] As Figure 1 shown, in one embodiment, it further includes:

[0053] Feeding box 7, the feeding box 7 is installed on the reaction tank 1, and the feeding box 7 is connected to the inside of the reaction tank 1.

[0054] In this embodiment, the feeding box 7 is divided into four compartments, and all four compartments are connected to the inside of the reaction tank 1. A ferrous ion solution, sodium sulfate, acid, and base are stored in the four compartments respectively. After sewage is added into the reaction tank 1, the pH is adjusted by adding acid and base into the reaction tank 1 through the feeding box 7, then sodium sulfate and ferrous iron are added to form a mixed solution, and the aeration assembly 3 is used to carry out the Fenton reaction on the ferrous iron in the mixed solution;

[0055] It should be noted that the number of compartments in the feeding box 7 can be increased or decreased according to the reaction solution required for storing the solution inside the reaction tank 1.

[0056] As Figure 1 shown, in one embodiment,

[0057] The aeration assembly 3 includes:

[0058] An aeration pump 33, the aeration pump 33 is installed on the base 2, and the aeration pump 33 is electrically connected to the power supply assembly;

[0059] An aeration pipe 32, one end of the aeration pipe 32 is connected to the aeration pump 33, and the other end extends into the reaction tank 1;

[0060] An aeration disc 31, the aeration disc 31 is installed inside the reaction tank 1, the aeration disc 31 is connected to one end of the aeration pipe 32 located inside the reaction tank 1, and the aeration disc 31 has a plurality of aeration holes.

[0061] In this embodiment, after acid, base, sodium sulfate, and ferrous iron are added into the reaction tank 1, the aeration pump 33 and the power supply assembly are turned on, and oxygen gathers on the graphite plate assembly 5 through the aeration pipe 32 and the aeration disc 31, increasing the production of hydrogen peroxide.

[0062] As Figure 1 - Figure 2 shown, in one embodiment,

[0063] The graphite plate assembly 5 includes: a first graphite plate 51, a second graphite plate 52, and a third graphite plate 53. The first graphite plate 51, the second graphite plate 52, and the third graphite plate 53 are sequentially and fixedly installed inside the reaction tank 1 along the direction from the top to the bottom of the reaction tank 1, and the first graphite plate 51, the second graphite plate 52, and the third graphite plate 53 are all provided with holes 54.

[0064] In this embodiment, the first graphite plate 51, the second graphite plate 52, and the third graphite plate 53 are installed in the reaction tank 1 in the order from top to bottom. Sewage is added into the reaction tank 1 through the water inlet 11. The water addition stops after the sewage submerges the first graphite plate 51. Then, the aeration pump 33 and the power supply assembly are turned on. Oxygen accumulates on the first graphite plate 51, the second graphite plate 52, and the third graphite plate 53 through the air supply pipe 32 and the air diffuser plate 31. Through the holes 54 on the first graphite plate 51, the second graphite plate 52, and the third graphite plate 53, oxygen reaches the positions of the second graphite plate 52 and even the first graphite plate 51, thereby efficiently generating hydrogen peroxide.

[0065] It should be noted that the structures of the first graphite plate 51, the second graphite plate 52, and the third graphite plate 53 are the same, the sizes of the holes 54 opened on the first graphite plate 51, the second graphite plate 52, and the third graphite plate 53 are also the same, and the first graphite plate 51, the second graphite plate 52, and the third graphite plate 53 can be arranged in any order, which will not affect the production rate of hydrogen peroxide.

[0066] Such as Figure 1 shown, in one embodiment,

[0067] The power supply assembly includes:

[0068] An external power supply 6, which is installed on the top of the reaction tank 1. The first graphite plate 51, the second graphite plate 52, and the third graphite plate 53 are all electrically connected to the negative electrode of the external power supply 6, and the external power supply 6 is also electrically connected to the aeration pump 33;

[0069] A reticulated ruthenium-iridium-titanium electrode 4, which is installed in the reaction tank 1. The reticulated ruthenium-iridium-titanium electrode 4 is located above the first graphite plate 51, and the reticulated ruthenium-iridium-titanium electrode 4 is electrically connected to the positive electrode of the external power supply 6.

[0070] In this embodiment, sewage is added into the reaction tank 1, and the sewage needs to submerge the reticulated ruthenium-iridium-titanium electrode 4 and the first graphite plate 51. Since the reticulated ruthenium-iridium-titanium electrode 4 is connected to the positive electrode of the external power supply 6, and the first graphite plate 51, the second graphite plate 52, and the third graphite plate 53 are electrically connected to the negative electrode of the external power supply 6 to ensure the normal reaction of the sewage. After the sewage submerges the reticulated ruthenium-iridium-titanium electrode 4 and the first graphite plate 51, the water inlet 11 is closed, and the feeding box 7 is opened. Acids, alkalis, sodium sulfate, and divalent iron are added into the sewage. Through the rapid electro-Fenton reaction, the pollutants in the water body can be rapidly degraded, the production of hydrogen peroxide can be increased, the efficiency of generating hydroxyl radicals can be improved, and at the same time, the utilization rate of hydroxyl radicals can be improved.

[0071] It should be noted that the first graphite plate 51, the second graphite plate 52, and the third graphite plate 53 are used as cathode materials, and the reticulated ruthenium-iridium-titanium electrode 4 is used as an anode material, which are electrically connected to the negative and positive electrodes of the external power supply 6 respectively.

[0072] As Figure 1 shown, in one embodiment,

[0073] The bottom lower wall of the reaction tank 1 is inclined, and the feed opening 8 is located at the lowest end of the reaction tank 1.

[0074] The iron sludge storage bin 10 is detachably installed on the base 2. The iron sludge storage bin 10 is communicated with the feed opening 8, and a valve 9 is installed on the feed opening 8.

[0075] In this embodiment, pollutants in the water body are rapidly degraded through the electro-Fenton reaction, and clean water will be obtained at the water outlet 12. The gas that does not participate in the two-electron reduction and the mineralized CO2 will be discharged through the exhaust port 13. At the same time, the inclination of the lower end of the reaction tank 1 can effectively collect the generated iron sludge hazardous waste, and further iron sludge treatment and utilization can be carried out, reducing environmental pollution and resource waste;

[0076] It should be noted that the cross-sectional view of the bottom of the reaction tank 1 is in a funnel-shaped structure, and the inclination of the lower wall facilitates the concentration of iron sludge in the sewage.

[0077] As Figure 1 shown, in one embodiment,

[0078] Electromagnetic valves are installed at the water inlet 11, the water outlet 12, and the exhaust port 13.

[0079] In this embodiment, the electromagnetic valves are used to further control the water inlet 11, the water outlet 12, and the exhaust port 13, facilitating the control of the sewage inflow, gas discharge, and clean water output in the reaction tank 1.

[0080] As Figure 1 shown, in one embodiment, it further includes:

[0081] The iron sludge storage bin 10 is detachably installed on the base 2. The iron sludge storage bin 10 is communicated with the feed opening 8, and a valve 9 is installed on the feed opening 8.

[0082] In this embodiment, the bottom of the reaction tank 1 is funnel-shaped, which can effectively collect the reaction precipitates of iron and other metals generated during the reaction, and convey the precipitates to the iron sludge storage bin 10 through the feeding port 8. The iron sludge storage bin 10 is detachably connected to the base 2. After the iron sludge storage bin 10 is full, it can be disassembled to facilitate the removal of the precipitates in the iron sludge storage bin 10. The opening and closing of the feeding port 8 are controlled by the valve 9. When the iron sludge storage bin 10 is disassembled, it can prevent the sewage in the reaction tank 1 from leaking out.

[0083] The sewage is introduced into the reaction tank 1 through the water inlet 11. By installing the first graphite plate 51, the second graphite plate 52, the third graphite plate 53, the reticulated ruthenium-iridium-titanium electrode 4 and the aeration assembly 3 in the reaction tank 1, after adding the sewage into the reaction tank 1, first add acid and alkali to adjust the pH, then add sodium sulfate and ferrous iron to obtain a mixed solution; then, the oxygen is accumulated on the first graphite plate 51, the second graphite plate 52 and the third graphite plate 53 through the aeration assembly 3 to efficiently generate hydrogen peroxide. The hydrogen peroxide reacts with the ferrous iron in the solution to produce strongly oxidizing free radicals - hydroxyl radicals, and the aeration drives the flow of the mixed solution, promoting the more efficient degradation of organic pollutants by the hydroxyl radicals. The anode is the reticulated ruthenium-iridium-titanium electrode 4, which directly oxidizes and degrades pollutants, and clean water is obtained at the water outlet 12. The iron sludge storage bin 10 is used to collect the iron sludge generated during the operation of the device, and its detachability facilitates the secondary utilization of the iron sludge, reducing resource waste and secondary pollution. This device uses the first graphite plate 51, the second graphite plate 52 and the third graphite plate 53 as the cathode, which has a large surface area, can increase the contact area between oxygen and the cathode and improve the hydrogen peroxide production, and at the same time significantly enhance the reduction of Fe 3+ and realize the recycling of Fe 2+ and reduce the generation of hazardous iron sludge waste. It is a new electro-Fenton treatment device that can efficiently treat polluted wastewater.

[0084] For the functions of the modules in each device of the embodiment of the present utility model, reference can be made to the corresponding descriptions in the above method, and details are not described herein again.

[0085] In the description of this specification, the descriptions with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0086] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "a plurality of" means two or more, unless otherwise specifically defined.

[0087] As described above, the above are only specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed in the present application can easily think of various changes or substitutions, and these should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A multi-cathode sewage electro-Fenton treatment device, characterized in that: include: A reaction tank, wherein the reaction tank is provided with a water inlet, a water outlet, an exhaust port and a feed discharge port; an aeration assembly, a portion of which is mounted outside the reaction tank, and another portion of which extends into the interior of the reaction tank; A graphite plate assembly, wherein the graphite plate assembly is installed inside the reaction tank and is located above the aeration assembly; A power supply assembly, the power supply assembly being electrically connected to the graphite plate assembly; Wherein, sewage is introduced into the reaction tank through the water inlet and does not pass through the aeration component, the graphite plate component and part of the power supply component.

2. The multi-cathode wastewater electro-Fenton treatment device according to claim 1, characterized in that: Also includes: A base, the reaction tank is installed on the base, and the part of the aeration component located outside the reaction tank is installed on the base.

3. The multi-cathode wastewater electro-Fenton treatment device according to claim 1, characterized in that: Also includes: A feeding box is installed on the reaction tank, and the feeding box is connected to the interior of the reaction tank.

4. The multi-cathode wastewater electro-Fenton treatment device according to claim 2, characterized in that: The aeration assembly comprises: an aeration pump, the aeration pump being mounted on the base and electrically connected to the power supply assembly; an aeration pipe, one end of which is connected to the aeration pump and the other end of which extends to the interior of the reaction tank; An aeration plate is installed inside the reaction tank, the aeration plate is connected to one end of the aeration pipe located inside the reaction tank, and the aeration plate is provided with a plurality of aeration holes.

5. The multi-cathode wastewater electro-Fenton treatment device according to claim 4, characterized in that: The graphite plate assembly includes: a first graphite plate, a second graphite plate and a third graphite plate, wherein the first graphite plate, the second graphite plate and the third graphite plate are fixedly installed in sequence inside the reaction tank from the top to the bottom of the reaction tank, and the first graphite plate, the second graphite plate and the third graphite plate are all provided with holes.

6. The multi-cathode wastewater electro-Fenton treatment device according to claim 5, characterized in that: The power supply assembly comprises: An external power supply, the external power supply is installed on the top of the reaction tank, the first graphite plate, the second graphite plate and the third graphite plate are all electrically connected to the negative electrode of the external power supply, and the external power supply is also electrically connected to the aeration pump; A mesh ruthenium iridium titanium electrode is installed in the reaction tank, the mesh ruthenium iridium titanium electrode is located above the first graphite plate, and the mesh ruthenium iridium titanium electrode is electrically connected to the positive pole of the external power supply.

7. The multi-cathode wastewater electro-Fenton treatment device according to claim 1, characterized in that: The bottom wall of the reaction tank is inclined, and the feed outlet is located at the bottom of the reaction tank.

8. The multi-cathode wastewater electro-Fenton treatment device according to claim 1, characterized in that: Solenoid valves are installed at the water inlet, the water outlet and the exhaust port.

9. The multi-cathode wastewater electro-Fenton treatment device according to claim 2, characterized in that: Also includes: An iron mud storage bin is detachably mounted on the base, the iron mud storage bin is communicated with the discharge port, and a valve is mounted on the discharge port.

10. The multi-cathode wastewater electro-Fenton treatment device according to claim 3, characterized in that: The feeding box is divided into four compartments, and the four compartments respectively store divalent iron ion solution, sodium sulfate, acid and alkali.

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