Novel Fenton equipment for high-concentration sewage treatment

Abstract

The utility model relates to novel Fenton equipment for high-concentration sewage treatment, and the equipment optimizes the reaction time of each section through segmented dosing reaction, accurate control of the pH value, ferrous sulfate ferrous ion concentration and hydrogen peroxide dosage, and significantly improves the sewage treatment efficiency. The equipment comprises four reaction tanks and corresponding auxiliary systems, the tanks are connected through pumps and pipelines to form a continuous reaction process, and each tank is provided with a stirrer and a chemical injection port. In a preferable technical scheme, the equipment is provided with a closed pool body, a valve, a medicine storage tank, a medicine injection pump, a flow controller, a pH sensor, a buffer pool and the like, so that the accurate control on the dosage, the reaction time and the pH value is realized. The design of the equipment aims at reducing the failure rate, improving the stability and the reliability and realizing effective treatment on pollutants.

Description

Technical Field

[0001] This application relates to the field of water treatment technology, specifically a novel Fenton device for treating high-concentration wastewater. Background Technology

[0002] The Fenton reaction is an inorganic chemical reaction in which a mixed solution of hydrogen peroxide and ferrous sulfate ions oxidizes many known organic compounds, such as carboxylic acids, alcohols, and esters, into inorganic forms. This reaction is highly effective at removing recalcitrant organic pollutants and is widely used in the treatment of wastewater from dyeing and printing, oily wastewater, phenolic wastewater, coking wastewater, nitrobenzene-containing wastewater, and diphenylamine-containing wastewater. Currently, Fenton equipment on the market is typically a tower-type structure, with all reagents added to the same container. This makes it difficult to control the dosage and reaction time at different stages, resulting in low treatment efficiency. Utility Model Content

[0003] The purpose of this application is to provide a novel Fenton device for treating high-concentration wastewater. This device precisely controls the pH value, the concentration of ferrous sulfate and ferrous ions, the dosage of hydrogen peroxide, and the reaction time of each stage through segmented chemical dosing reactions, thereby improving the treatment efficiency of pollutants in the wastewater. To achieve the above objective, this application provides the following technical solution: A novel Fenton device for treating high-concentration wastewater, comprising:

[0004] It consists of four reaction tanks: the first reaction tank, the second reaction tank, the third reaction tank, and the fourth reaction tank. The liquid in the previous reaction tank is injected into the next reaction tank through sewage pumps and pipelines, forming a continuous reaction process. Each reaction tank is equipped with a stirrer. Each reaction tank is equipped with a chemical injection port at the top, and different chemical solutions are injected into the injection ports. The first reaction tank is injected with acid, the second reaction tank with ferrous sulfate, the third reaction tank with hydrogen peroxide, and the fourth reaction tank with alkali.

[0005] In a preferred embodiment of this technical solution, the first reaction tank, the second reaction tank, the third reaction tank, and the fourth reaction tank are all enclosed tanks with a cover on top, and the cover is provided with an air outlet.

[0006] The preferred embodiment of this technical solution also includes valves, which are installed on the pipes before each of the sewage pumps.

[0007] In a preferred embodiment, this technical solution further includes a drug storage tank and a drug injection pump. Four drug storage tanks and four drug injection pumps are provided, corresponding to the first reaction tank, the second reaction tank, the third reaction tank, and the fourth reaction tank, respectively. The four drug storage tanks are filled with different drug solutions, and the drug injection pumps inject the drug solutions in the drug storage tanks into each reaction tank through pipelines.

[0008] In a preferred embodiment, this technical solution also includes a flow controller, which is installed on the pipeline connecting the injection pump and the storage tank.

[0009] In a preferred embodiment of this technical solution, the first reaction tank is connected to a sewage tank, and the sewage tank is equipped with a sewage pump and a pipeline. The sewage pump injects sewage into the first reaction tank through the pipeline.

[0010] In a preferred embodiment of this technical solution, pH sensors are provided on the first reaction tank and the fourth reaction tank to monitor the pH value of the liquid in the first reaction tank and the fourth reaction tank in real time.

[0011] In a preferred embodiment, this technical solution further includes a buffer tank, which is connected to the fourth reaction tank via a sewage pump and pipeline, and is used to receive the liquid treated by the fourth reaction tank.

[0012] In a preferred embodiment of this technical solution, the mixer is disposed at the top of the first reaction tank, the second reaction tank, the third reaction tank, and the fourth reaction tank. The mixer has a stirring motor, a rotating shaft, and fan blades. The fan blades are symmetrically arranged on the rotating shaft. The stirring motor is connected to the rotating shaft and is used to drive the rotating shaft to rotate.

[0013] In a preferred embodiment of this technical solution, the fan blades are arranged in a double layer along the axis of the rotating shaft.

[0014] Compared with the prior art, the beneficial effects of this application are:

[0015] This application provides a novel Fenton device for treating high-concentration wastewater, which significantly improves wastewater treatment efficiency through segmented chemical dosing. Compared with existing technologies, this novel device can precisely control pH value, ferrous sulfate and ferrous ion concentration, hydrogen peroxide dosage, and reaction time in each stage, thereby effectively improving the treatment efficiency of pollutants in wastewater. It adopts a segmented design with four reaction tanks, forming a continuous reaction process between them via wastewater pumps and pipelines. This design allows for independent control of each reaction tank, facilitating optimal dosing and reaction time, further improving wastewater treatment effectiveness. Simultaneously, this design reduces equipment failure rate and improves equipment stability and reliability. Each reaction tank has a chemical injection port at its top for injecting different chemical solutions. This design allows for the injection of different chemical solutions into each reaction tank according to actual needs, achieving targeted treatment of pollutants. For example, injecting acid into the first reaction tank helps increase the solubility of pollutants; injecting ferrous sulfate into the second reaction tank helps promote the oxidation of pollutants; injecting hydrogen peroxide into the third reaction tank helps oxidize and decompose pollutants; and injecting alkali into the fourth reaction tank helps adjust the pH value, making pollutants easier to remove. This staged dosing method effectively improves wastewater treatment efficiency. Attached Figure Description

[0016] Figure 1 This is a perspective view of a novel Fenton device for treating high-concentration wastewater as proposed in the embodiments of this application;

[0017] Figure 2 for Figure 1 Enlarged view of A in the middle;

[0018] Figure 3 for Figure 1 Enlarged view of B in the middle;

[0019] Figure 4 This is a 3D schematic diagram of a mixer;

[0020] In the diagram: 1. First reaction tank; 2. Second reaction tank; 3. Third reaction tank; 4. Fourth reaction tank; 5. Sewage pump; 6. Agitator; 7. Injection port; 8. Cover; 9. Vent; 10. Valve; 11. Storage tank; 12. Injection pump; 13. Flow controller; 14. Buffer tank; 15. Agitator motor; 16. Shaft; 17. Fan blade; 18. Sewage tank. Detailed Implementation

[0021] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] It should be noted that in the description of this application, the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0023] Furthermore, it should be understood that, for ease of description, the dimensions of the various components shown in the accompanying drawings are not drawn to actual scale; for example, the thickness or width of some layers may be exaggerated relative to other layers.

[0024] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined or described in one figure, it will not need to be discussed or described in detail in the description of the subsequent figures.

[0025] In order to solve the technical problems in the background art, such as Figure 1-4 As shown, this application provides a technical solution: a novel Fenton device for treating high-concentration wastewater, characterized as follows:

[0026] The first reaction tank 1 receives high-concentration wastewater to be treated. The wastewater first enters the first reaction tank 1, and acid is injected into it through the injection port 7 to adjust the pH value of the wastewater to a suitable acidic environment, typically to 3-4. The second reaction tank 2, after pH adjustment, is used to inject the liquid from the first reaction tank 1 into the second reaction tank 2 via the wastewater pump 5 and pipelines. In the second reaction tank 2, ferrous sulfate is injected through the injection port 7. The ferrous sulfate reacts with the H+ in the acid solution... + The ionic reaction generates ferrous ions (Fe2+). The mixer 6 continues stirring to ensure a uniform distribution of the ferrous ions. Similarly, the liquid from the second reaction tank 2 is injected into the third reaction tank 3 via the wastewater pump 5 and pipelines. In the third reaction tank 3, hydrogen peroxide is injected through the injection port 7. The hydrogen peroxide reacts with the ferrous ions via a Fenton reaction, generating highly oxidizing ·OH radicals, effectively degrading organic matter in the wastewater. The liquid from the third reaction tank 3 is then injected into the fourth reaction tank 4 via the wastewater pump 5 and pipelines. In the fourth reaction tank 4, alkaline solution is injected through the injection port 7 to neutralize any remaining acidic substances after the reaction, raising the pH of the treated liquid to meet discharge standards. Each reaction tank is equipped with a mixer 6 to thoroughly mix the chemicals and wastewater in each tank, ensuring uniform reaction. The injection port 7 is located at the top of each reaction tank for injecting the appropriate chemicals.

[0027] Furthermore, the first reaction tank 1, the second reaction tank 2, the third reaction tank 3, and the fourth reaction tank 4 are all enclosed tanks, each covered with a cover 8. The cover 8 has a vent 9. The cover 8 employs a sealed design to ensure the reaction is not disturbed by external factors and that the reaction is complete. The vent 9 on the cover 8 is used to discharge toxic and harmful gases generated during the treatment process, while simultaneously maintaining stable internal pressure.

[0028] It should be noted that a valve 10 is installed on the pipeline before each sewage pump 5 to control the liquid flow rate from the previous reaction tank to the next reaction tank. The valve 10 can be manually or automatically controlled to adapt to different treatment needs and flow rate adjustments.

[0029] It is worth noting that the system includes four storage tanks 11 and four injection pumps 12. Specifically, the storage tanks 11 and injection pumps 12 are respectively located near the first reaction tank 1, the second reaction tank 2, the third reaction tank 3, and the fourth reaction tank 4. The injection pumps 12 are used to inject the drug solution in the storage tanks 11 into each reaction tank through pipelines. The four storage tanks 11 are filled with different drug solutions for injection into different reaction tanks.

[0030] It should be noted that the flow controller 13 is installed on the pipeline connecting the injection pump 12 and the storage tank 11 to control the flow rate of the liquid medicine, ensuring the stability and accuracy of the medicine delivery. Firstly, in the first reaction tank 1, Fenton's reagent reacts under acidic conditions. In neutral and alkaline environments, ferrous ions cannot catalyze the oxidation of hydrogen peroxide to produce OH-. The influent pH value is generally between 3 and 4, resulting in the highest removal rate and best effect. Since the oxidation is essentially a hydroxyl radical (OH), OH can react with most organic matter to degrade it. Too high a pH easily generates Fe(OH)+, colloids, or amorphous ferric oxide precipitates, thus reducing or eliminating the catalytic activity of the system, which is unfavorable for the formation of (OH). Conversely, when the pH is too low, H+ is a scavenger of (OH), and the slow decomposition of hydrogen peroxide is also unfavorable for the formation of (OH). Secondly, if the concentration of ferrous ions in the second reaction tank 2 is too low, the reaction rate will be extremely slow; if there is an excess of ferrous ions, they will reduce hydrogen peroxide and oxidize themselves to ferric ions, consuming the reagent and increasing the color of the effluent. As the concentration of ferrous ions increases, COD, Cr, decolorization rate, and removal rate gradually increase. However, if the concentration of ferrous ions is too high, a large number of hydroxyl radicals (OH) will be generated in the effluent at the beginning. OH reacts slowly with organic matter, causing OH to accumulate, resulting in a decrease in OH. Furthermore, ferrous ions will consume some hydrogen peroxide. Therefore, the concentration of ferrous ions should be controlled according to the water quality and quantity. Thirdly, if the amount of hydrogen peroxide added in the third reaction tank 3 is too high, not only will it not generate more hydroxyl radicals, but it will also oxidize ferrous ions to ferric ions at the beginning of the reaction. The reaction will proceed under the catalysis of the oxidized ferric ions, consuming hydrogen peroxide and inhibiting the generation of hydroxyl radicals. At the same time, excessive hydrogen peroxide will affect the subsequent flocculation and sedimentation effect.

[0031] Furthermore, a wastewater tank 18 is located on one side of the first reaction tank 1, and its internal structure is similar to that of the first reaction tank 1, also being a rectangular tank. It is also made of corrosion-resistant materials. The wastewater tank 18 is used to collect wastewater to be treated. A wastewater pump 5 is located above the wastewater tank 18 and is used to pump wastewater from the wastewater tank 18 to the first reaction tank 1. The wastewater pump 5 adopts a high-efficiency and energy-saving design to ensure smooth wastewater transport.

[0032] It should be noted that pH sensors are installed in the first reaction tank 1 and the fourth reaction tank 4, respectively. The pH sensors employ advanced measurement technology to monitor the pH value of the liquid in the tank in real time and transmit the data to the data processing system. Based on changes in pH value, reaction conditions are adjusted, such as by adding acid or alkali adjusters, to maintain the stability of the reaction process. Acid solution is injected into the first storage tank 11 through the injection port 7 of the first reaction tank 1 via the injection pump 12 and flow controller 13. The agitator 6 is used to thoroughly stir the solution, adjusting the pH value of the wastewater to 3-4. The pH sensor monitors and provides feedback on the pH value in real time to ensure accurate adjustment. The treated liquid in the third reaction tank 3 is transported to the fourth reaction tank 4 via the wastewater pump 5. Simultaneously, the alkali solution in the fourth storage tank 11 is transported to the injection port 7 of the fourth reaction tank 4 via the injection pump 12. The flow controller 13 controls the flow rate of the alkali solution, and the agitator 6 continues stirring to adjust the pH value of the wastewater to a suitable discharge standard. The pH sensor in the fourth reaction tank 4 monitors and provides feedback on the pH value in real time to ensure the final effluent quality.

[0033] Furthermore, the buffer tank 14 receives the liquid treated by the fourth reaction tank 4, serving as a buffer and storage unit. Within the buffer tank 14, the liquid can be further stabilized, providing stable influent conditions for subsequent processing units.

[0034] It should be noted that the agitator 6 is located at the top of the first reaction tank 1, the second reaction tank 2, the third reaction tank 3, and the fourth reaction tank 4. The agitator motor 15 is the power source for the agitator 6, driving its rotation. The rotating shaft 16 connects the agitator motor 15 and the fan blades 17, transmitting power from the agitator motor 15 to drive the fan blades 17. The rotating shaft 16 is made of high-strength stainless steel, possessing excellent corrosion resistance and wear resistance. The fan blades 17 are symmetrically arranged on the rotating shaft 16 to agitate the liquid within the reaction tanks. The fan blades 17 feature a streamlined design, effectively improving agitation efficiency.

[0035] It is worth noting that the fan blades 17 are arranged in a double layer along the axis of the rotating shaft 16, symmetrically, for stirring the liquid in the tank. The spacing between the first and second layer of fan blades 17 can be adjusted according to actual needs. The double-layered fan blades 17 form two independent fluid layers during rotation, thereby improving the stirring efficiency of the mixer 6.

[0036] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A novel Fenton device for treating high-concentration wastewater, characterized in that, include: It consists of four reaction tanks, namely the first reaction tank (1), the second reaction tank (2), the third reaction tank (3) and the fourth reaction tank (4). The liquid in the previous reaction tank is injected into the next reaction tank through the sewage pump (5) and the pipeline, forming a continuous reaction process. Each reaction tank is equipped with a stirrer (6). Each reaction tank is equipped with a drug injection port (7) at the top. Different drug solutions are injected into the drug injection port (7). The first reaction tank (1) is injected with acid, the second reaction tank (2) is injected with ferrous sulfate, the third reaction tank (3) is injected with hydrogen peroxide, and the fourth reaction tank (4) is injected with alkali.

2. The novel Fenton device for treating high-concentration wastewater according to claim 1, characterized in that, The first reaction tank (1), the second reaction tank (2), the third reaction tank (3) and the fourth reaction tank (4) are all closed tanks with a cover (8) on top, and an air outlet (9) is provided on the cover (8).

3. The novel Fenton device for treating high-concentration wastewater according to claim 2, characterized in that, It also includes valves (10) which are installed on the pipes before each of the sewage pumps (5).

4. The novel Fenton device for treating high-concentration wastewater according to claim 3, characterized in that, It also includes a drug storage tank (11) and a drug injection pump (12). Four drug storage tanks (11) and four drug injection pumps (12) are provided, corresponding to the first reaction pool (1), the second reaction pool (2), the third reaction pool (3) and the fourth reaction pool (4) respectively. The four drug storage tanks (11) are filled with different drug solutions. The drug injection pump (12) injects the drug solution in the drug storage tank (11) into each reaction pool through the pipeline.

5. The novel Fenton device for treating high-concentration wastewater according to claim 4, characterized in that, It also includes a flow controller (13), which is installed on the pipeline connecting the injection pump (12) and the storage tank (11).

6. The novel Fenton device for treating high-concentration wastewater according to claim 5, characterized in that, The first reaction tank (1) is connected to the sewage tank (18), and the sewage tank (18) is equipped with the sewage pump (5) and the pipeline. The sewage pump (5) injects sewage into the first reaction tank (1) through the pipeline.

7. The novel Fenton device for treating high-concentration wastewater according to claim 1, characterized in that, The first reaction tank (1) and the fourth reaction tank (4) are equipped with pH sensors for real-time monitoring of the pH value of the liquid in the first reaction tank (1) and the fourth reaction tank (4).

8. The novel Fenton device for treating high-concentration wastewater according to claim 4, characterized in that, It also includes a buffer tank (14), which is connected to the fourth reaction tank (4) via a sewage pump (5) and a pipe, for receiving the liquid treated by the fourth reaction tank (4).

9. The novel Fenton device for treating high-concentration wastewater according to claim 1, characterized in that, The mixer (6) is located on top of the first reaction tank (1), the second reaction tank (2), the third reaction tank (3) and the fourth reaction tank (4). The mixer (6) has a stirring motor (15), a rotating shaft (16) and fan blades (17). The fan blades (17) are symmetrically arranged on the rotating shaft (16). The stirring motor (15) is connected to the rotating shaft (16) and is used to drive the rotating shaft (16) to rotate.

10. The novel Fenton device for treating high-concentration wastewater according to claim 9, characterized in that, The fan blade (17) is arranged in a double layer along the axis of the rotating shaft (16).

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