Electro-Fenton device with ultrafiltration function
By adopting the combination of an alkaline Fenton system and an ultrafiltration membrane box in the electrofenton device, the problem of catalysts being easily lost and consumed a large amount of resources in traditional electrofenton technology is solved, and efficient oxidation and degradation of organic pollutants and catalyst regeneration are achieved.
Patent Information
- Application Number
- CN202421274122.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-05
- Publication Date
- 2025-03-11
- Estimated Expiration
- 2034-06-05
AI Technical Summary
When traditional electrofenton technology deals with difficult-to-degrade organic pollutants, the catalyst is easily lost and requires a large amount of ferrous salt and anode iron sheets, and lacks the ability to oxidize and degrade.
An alkaline electrofenton device with ultrafiltration function is adopted to generate hydrogen peroxide and ferrous hydroxide under alkaline conditions through the carbon cathode and platinum anode to form an alkaline Fenton system, degrade organic pollutants in the wastewater, and solid-liquid separation is achieved through the ultrafiltration membrane box to avoid catalyst loss.
Highly efficient oxidative degradation of organic pollutants is achieved, and the catalyst ferrous hydroxide can be regenerated without consuming ferrous salt and anode iron sheets, and the loss of catalyst is avoided.
Smart Images
Figure CN222593589U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of sewage treatment and relates to an electric Fenton device with an ultrafiltration function. Background Art
[0002] With the increasing development of science and technology and the rapid improvement of human industrialization, the accompanying environmental pollution problem has become more and more serious, and the types of refractory organic matter produced in industrial production are increasing. For these refractory organic pollutants, traditional biochemical treatment technology has little effect, and advanced oxidation process with strong degradation ability has stood out in this context.
[0003] Among the advanced oxidation processes, there is a technology called the electro-Fenton process. Hydrogen peroxide (H2O2) reacts with a catalyst to produce an intermediate hydroxyl radical (·OH). This intermediate has a very strong oxidizing ability, and its oxidation potential is 2.8V, which is only lower than the redox potential of fluorine, 3.08V. Therefore, the strong oxidizing ability of the electro-Fenton technology is applied to the degradation of various organic pollutants. According to the different reaction mechanisms, the electro-Fenton technology can be divided into four types, namely the electro-Fenton-ferrous cathode cycle method, the electro-Fenton-iron oxidation method, the electro-Fenton-H2O2 method, and the electro-Fenton-iron oxidation-H2O2 method.
[0004] The electro-Fenton-ferrous cathode cycle method is to add H2O2 and ferrous salt externally, and the iron ions (Fe 3+ ) can be reduced to ferrous ions (Fe 2+ ), but the ferrous salts will eventually be lost along with the sewage into the next process, which requires the consumption of a large amount of H2O2 and ferrous salts.
[0005] The electro-Fenton-iron oxidation method is also called the sacrificial anode method. It uses iron (Fe) sheets as anodes to produce Fe by adding H2O2 externally. 2+ , which requires consumption of a large amount of H2O2 and anode materials.
[0006] The electro-Fenton-H2O2 method is to produce H2O2 by a two-electron reduction reaction of oxygen (O2) at the cathode, and then add ferrous salt externally. 3+ Can be reduced to Fe on the cathode surface 2+ However, ferrous salts will eventually be lost along with the sewage into the next process, which requires the consumption of a large amount of ferrous salts.
[0007] The electro-Fenton-iron oxidation-H2O2 method is to produce H2O2 by a two-electron reduction reaction of O2 at the cathode, and to form Fe by using Fe sheets as an anode. 2+ , which requires consumption of a large amount of anode material.
[0008] However, traditional electro-Fenton technologies are all acidic Fenton, Fe2+ It needs to be catalyzed under acidic conditions and consumes a large amount of catalyst (Fe 2+ or Fe sheet).
[0009] Patent CN219907135U discloses a wastewater pretreatment system with ultrasonic and ultrafiltration functions, including an inlet pool, a solid-liquid separation pool, an ultrafiltration membrane box, an ultrasonic generator, a microporous aerator, a scraping device, a backwashing water tank and a Roots blower; when the patent is further applied to the treatment of potato starch extraction wastewater, the potato starch extraction wastewater enters the solid-liquid separation pool from the bottom of the inlet pool, and then passes through the ultrafiltration membrane box to achieve solid-liquid separation; the ultrasonic generator can ultrasonically clean the starch particles and fibers attached to the surface of the ultrafiltration membrane; the microporous aerator can float the fibers in the wastewater to the top of the pool, and play a role in defoaming the wastewater, and at the same time flush the starch particles and fibers attached to the surface of the ultrafiltration membrane; the scraping device discharges the fibers from the equipment; and finally a white starch product is obtained by a sludge pump; the backwashing water tank can also realize the backwashing of the ultrafiltration membrane box. However, this patent does not adopt any advanced oxidation technology structure and does not have the ability to oxidatively degrade organic pollutants. Utility Model Content
[0010] The purpose of the utility model is to provide an electric Fenton device with ultrafiltration function in order to overcome at least one defect of the above-mentioned prior art. The alkaline Fenton system of the utility model has the ability to oxidatively degrade organic pollutants, the catalyst is not easily lost and can be regenerated, and no ferrous salts and anode iron sheets need to be consumed during operation.
[0011] The purpose of the utility model can be achieved through the following technical solutions:
[0012] One of the technical solutions of the utility model is to provide an electro-Fenton device with ultrafiltration function, which includes an inlet pool, a solid-liquid separation pool, an inlet pump, a water production pump, an ultrafiltration membrane box, a carbon cathode, a platinum anode and a catalyst ferrous hydroxide, wherein the inlet pipeline of the inlet pump is connected to external water inlet, the outlet pipeline is connected to the inlet pool through a pipeline, the inlet pipeline of the water production pump is connected to the ultrafiltration membrane box through a pipeline, and the outlet pipeline is connected to external water outlet;
[0013] The water inlet pool is connected to the solid-liquid separation pool, the ultrafiltration membrane box is immersed in the solid-liquid separation pool, the carbon cathode and the platinum anode are evenly inserted in the ultrafiltration membrane box, the ferrous hydroxide is evenly distributed in the solid-liquid separation pool, oxygen is electrolyzed at the carbon cathode to generate hydrogen peroxide and form an alkaline Fenton system with ferrous hydroxide to degrade organic pollutants in the wastewater; the ferric hydroxide generated by the alkaline Fenton system is reduced to ferrous hydroxide at the carbon cathode to achieve regeneration of ferrous hydroxide.
[0014] As a preferred technical solution, the carbon cathode and the platinum anode are evenly inserted into the ultrafiltration membrane box from top to bottom.
[0015] Furthermore, the ultrafiltration membrane in the ultrafiltration membrane box intercepts the ferrous hydroxide in the wastewater, realizes solid-liquid separation and avoids the loss of ferrous hydroxide, and the filtrate is discharged by the water production pump.
[0016] Furthermore, the ultrafiltration membrane is a hollow fiber membrane.
[0017] As a preferred technical solution, the pore size of the ultrafiltration membrane is 80-120 nm.
[0018] Furthermore, a partition is arranged between the water inlet tank and the solid-liquid separation tank, the first partition near the water inlet tank is fixed to the top of the water inlet tank, the second partition near the solid-liquid separation tank is fixed to the bottom of the solid-liquid separation tank, and the bottom of the first partition is lower than the top of the second partition.
[0019] Furthermore, the wastewater overflows from the bottom of the inlet tank into the solid-liquid separation tank.
[0020] Furthermore, the device also includes a Roots blower and a microporous aerator.
[0021] Furthermore, the microporous aerator is arranged in the solid-liquid separation tank and below the ultrafiltration membrane box, and the microporous aerator and the Roots blower are connected through a pipeline.
[0022] As a preferred technical solution, the microporous aerator is arranged at the bottom of the ultrafiltration membrane box.
[0023] Furthermore, air is introduced into the solid-liquid separation tank by a Roots blower, and forms microbubbles after passing through a microporous aerator, so as to evenly disperse the ferrous hydroxide in the solid-liquid separation tank.
[0024] Furthermore, the device also includes a backwash water tank and a backwash water pump.
[0025] Furthermore, the inlet pipeline of the backwash water tank and the outlet pipeline of the water production pump are connected through a pipeline, the outlet pipeline and the inlet pipeline of the backwash water pump are connected through a pipeline, and the outlet pipeline of the backwash water pump and the ultrafiltration membrane box are connected through a pipeline;
[0026] The produced water in the backwash water tank enters the ultrafiltration membrane box through the backwash water pump to achieve backwashing of the ultrafiltration membrane.
[0027] As a preferred technical solution, the Fenton system is an alkaline Fenton, which is different from the traditional acidic Fenton, and the pH value of the wastewater is adjusted to 7-9.
[0028] As a preferred technical solution, the hydraulic retention time of the solid-liquid separation tank is 0.5-1h.
[0029] As a preferred technical solution, the mass ratio of ferrous hydroxide to wastewater in the solid-liquid separation tank is (1.5-2.5):100.
[0030] As a preferred technical solution, the voltage is 22-24V.
[0031] As a preferred technical solution, the operation mode of the ultrafiltration membrane includes constant flow or intermittent.
[0032] As a preferred technical solution, the intermittent operation mode of the ultrafiltration membrane is running for 7-9 minutes / resting for 3-5 minutes.
[0033] As a preferred technical solution, the unit water production flow rate of the ultrafiltration membrane corresponds to a membrane area of 100-200m 2 .
[0034] As a preferred technical solution, the backwash flux of the ultrafiltration membrane is 50-60L / m 2 ·h.
[0035] As a preferred technical solution, the backwashing method of the ultrafiltration membrane is running for 20-40 minutes / backwashing for 1-3 minutes.
[0036] Compared with the prior art, the utility model has the following beneficial effects:
[0037] (1) The Roots blower and microporous aerator of the utility model can evenly disperse the catalyst ferrous hydroxide and oxygen in the solid-liquid separation tank. The oxygen can be electrolyzed at the carbon cathode to generate hydrogen peroxide and form an alkaline Fenton system with ferrous hydroxide to degrade organic matter in the wastewater.
[0038] (2) The catalyst of the utility model is ferrous hydroxide, rather than the traditional catalyst ferrous ion. The ferric hydroxide produced by the alkaline Fenton system can be reduced to ferrous hydroxide at the carbon cathode, so that the ferrous hydroxide can be regenerated, and no ferrous salt and anode iron sheet need to be consumed during operation.
[0039] (3) When the utility model is applied to the treatment of organic wastewater, the organic wastewater enters the solid-liquid separation tank from the bottom of the water inlet tank, and then passes through the ultrafiltration system to achieve solid-liquid separation. Applying ultrafiltration technology to electro-Fenton can avoid the problem of ferrous hydroxide loss. BRIEF DESCRIPTION OF THE DRAWINGS
[0040] Figure 1 This is a schematic diagram of the main structure of the electro-Fenton device with ultrafiltration function in an embodiment of the utility model;
[0041] Figure 2 It is a schematic diagram of the top view of the structure of the electro-Fenton device with ultrafiltration function in an embodiment of the utility model.
[0042] Description of the markings in the figure:
[0043] 1—water inlet tank, 2—solid-liquid separation tank, 3—water inlet pump, 4—water production pump, 5—ultrafiltration membrane box, 6—Roots blower, 7—microporous aerator, 8—backwash water tank, 9—backwash water pump, 10—carbon cathode, 11—platinum anode, 12—ferrous hydroxide. DETAILED DESCRIPTION
[0044] The present invention is described in detail below in conjunction with specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and a specific operation process, but the protection scope of the present invention is not limited to the following embodiments.
[0045] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third" and the like are used to describe common objects, and only refer to different instances of the same object, and are not intended to imply that the objects described in this way must adopt a given order, whether in time, space, order or any other manner.
[0046] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0047] Example:
[0048] An electro-Fenton device with ultrafiltration function, such as Figure 1 and Figure 2 As shown, it is mainly composed of an inlet pool 1, a solid-liquid separation pool 2, an inlet pump 3, a water production pump 4, an ultrafiltration membrane box 5, a Roots blower 6, a microporous aerator 7, a backwash water tank 8, a backwash water pump 9, a carbon cathode 10, a platinum anode 11 and a catalyst ferrous hydroxide 12. The inlet pipeline of the inlet pump 3 is connected to the external water inlet, and the outlet pipeline is connected to the inlet pool 1 through a pipeline. The inlet pipeline of the water production pump 4 is connected to the ultrafiltration membrane box 5 through a pipeline, and the outlet pipeline is connected to the external water outlet;
[0049] The water inlet pool 1 is connected to the solid-liquid separation pool 2, the ultrafiltration membrane box 5 is immersed in the solid-liquid separation pool 2, the carbon cathode 10 and the platinum anode 11 are evenly inserted in the ultrafiltration membrane box 5 from top to bottom, and the ferrous hydroxide 12 is evenly distributed in the solid-liquid separation pool 2. Oxygen can be electrolyzed at the carbon cathode 10 to generate hydrogen peroxide and form an alkaline Fenton system with the ferrous hydroxide 12 to degrade organic pollutants in the wastewater; the ferric hydroxide generated by the alkaline Fenton system can be reduced to ferrous hydroxide 12 at the carbon cathode 10 to achieve the regeneration of the ferrous hydroxide 12;
[0050] The ultrafiltration membrane in the ultrafiltration membrane box 5 intercepts the ferrous hydroxide 12 in the wastewater, realizes solid-liquid separation, and avoids the loss of ferrous hydroxide 12, and the filtrate is discharged by the water production pump 4;
[0051] A partition is provided between the water inlet tank 1 and the solid-liquid separation tank 2. The first partition near the water inlet tank 1 is fixed to the top of the water inlet tank 1, and the second partition near the solid-liquid separation tank 2 is fixed to the bottom of the solid-liquid separation tank 2. The bottom of the first partition is lower than the top of the second partition.
[0052] Wastewater overflows from the bottom of the inlet tank 1 and enters the solid-liquid separation tank 2;
[0053] The microporous aerator 7 is arranged in the solid-liquid separation tank 2 and below the ultrafiltration membrane box 5. In this embodiment, the microporous aerator 7 is arranged at the bottom of the solid-liquid separation tank 2, and the microporous aerator 7 and the Roots blower 6 are connected by a pipeline;
[0054] Air is introduced into the solid-liquid separation tank 2 by the Roots blower 6, and forms microbubbles after passing through the microporous aerator 7, and the ferrous hydroxide 12 is evenly dispersed in the solid-liquid separation tank 2;
[0055] The inlet pipeline of the backwash water tank 8 is connected to the outlet pipeline of the water production pump 4 through a pipeline, the outlet pipeline is connected to the inlet pipeline of the backwash water pump 9 through a pipeline, and the outlet pipeline of the backwash water pump 9 is connected to the ultrafiltration membrane box 5 through a pipeline;
[0056] The produced water in the backwash water tank 8 enters the ultrafiltration membrane box 5 through the backwash water pump 9 to achieve backwashing of the ultrafiltration membrane.
[0057] The Fenton system is an alkaline Fenton, which is different from the traditional acidic Fenton. The pH value of the wastewater needs to be adjusted to 7-9.
[0058] The hydraulic retention time of the solid-liquid separation tank 2 is selected to be 0.5-1h.
[0059] The mass ratio of ferrous hydroxide 12 to wastewater in the solid-liquid separation tank 2 is controlled at (1.5-2.5):100.
[0060] The voltage is controlled at 22-24V.
[0061] The ultrafiltration membrane is a hollow fiber membrane.
[0062] The pore size of the ultrafiltration membrane is selected to be 80-120 nm.
[0063] The operation mode of the ultrafiltration membrane can be selected as constant flow or intermittent.
[0064] The intermittent operation mode of the ultrafiltration membrane is selected as running 7-9 minutes / resting 3-5 minutes.
[0065] The unit water flow rate of the ultrafiltration membrane corresponds to a membrane area of 100-200m 2 .
[0066] The backwash flux of the ultrafiltration membrane is selected to be 50-60L / m 2 ·h.
[0067] The backwashing mode of the ultrafiltration membrane is selected as running 20-40min / backwashing 1-3min.
[0068] The coking wastewater (chemical oxygen demand (COD) of 4420 mg / L) from a coal coking plant in Taiyuan, Shanxi Province was taken as the treatment object, and the coking wastewater was degraded and treated by using this embodiment.
[0069] Embodiment 1:
[0070] The specific parameters of this embodiment are as follows: the pH value of the wastewater needs to be adjusted to 7, the hydraulic retention time is set to 0.5h, the mass ratio of ferrous hydroxide 12 to wastewater is controlled at 2.5:100, the voltage is controlled at 24V, the pore size is selected to be 100nm and the membrane area is 150m 2 Hollow fiber membrane, 1m 3 / h constant flow intermittent operation (run 9min / rest 1min), backwash flux selected 50L / m 2 ·h (operation 30min / backwash 1min).
[0071] Final result: COD value of coking wastewater was degraded from 4420mg / L to 354mg / L, with a degradation rate of 92%.
[0072] Embodiment 2:
[0073] The specific parameters of this embodiment are as follows: the pH value of the wastewater needs to be adjusted to 9, the hydraulic retention time is set to 1h, the mass ratio of ferrous hydroxide 12 to wastewater is controlled at 1.5:100, the voltage is controlled at 22V, the pore size is selected to be 100nm and the membrane area is 150m 2 Hollow fiber membrane, 1m 3 / h constant flow intermittent operation (run 9min / rest 1min), backwash flux selected 60L / m 2 ·h (operation 30min / backwash 1min).
[0074] Final result: COD value of coking wastewater was degraded from 4420mg / L to 177mg / L, with a degradation rate of 96%.
[0075] The above description of the embodiments is to facilitate the understanding and use of the utility model by those skilled in the art. It is obvious that those familiar with the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the utility model is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the utility model without departing from the scope of the utility model should be within the scope of protection of the utility model.
Claims
1. An electro-Fenton device with ultrafiltration function, characterized in that: The device comprises a water inlet pool (1), a solid-liquid separation pool (2), a water inlet pump (3), a water production pump (4), an ultrafiltration membrane box (5), a carbon cathode (10), a platinum anode (11) and a catalyst ferrous hydroxide (12), wherein the inlet pipeline of the water inlet pump (3) is connected to external water inlet, and the outlet pipeline is connected to the water inlet pool (1) through a pipeline, the inlet pipeline of the water production pump (4) is connected to the ultrafiltration membrane box (5) through a pipeline, and the outlet pipeline is connected to external water outlet; The water inlet pool (1) is connected to the solid-liquid separation pool (2), the ultrafiltration membrane box (5) is immersed in the solid-liquid separation pool (2), the carbon cathode (10) and the platinum anode (11) are inserted in the ultrafiltration membrane box (5), the ferrous hydroxide (12) is distributed in the solid-liquid separation pool (2), and oxygen is electrolyzed at the carbon cathode (10) to generate hydrogen peroxide and form an alkaline Fenton system with the ferrous hydroxide (12).
2. The electro-Fenton device with ultrafiltration function according to claim 1, characterized in that: The ultrafiltration membrane in the ultrafiltration membrane box (5) intercepts the ferrous hydroxide (12) in the wastewater, and the filtrate is discharged by the water production pump (4).
3. The electro-Fenton device with ultrafiltration function according to claim 2, characterized in that: The ultrafiltration membrane adopts a hollow fiber membrane.
4. The electro-Fenton device with ultrafiltration function according to claim 1, characterized in that: A partition is provided between the water inlet tank (1) and the solid-liquid separation tank (2), wherein a first partition on the side close to the water inlet tank (1) is fixed to the top of the water inlet tank (1), and a second partition on the side close to the solid-liquid separation tank (2) is fixed to the bottom of the solid-liquid separation tank (2), and the bottom of the first partition is lower than the top of the second partition.
5. The electro-Fenton device with ultrafiltration function according to claim 4, characterized in that: Wastewater overflows from the bottom of the water inlet tank (1) and enters the solid-liquid separation tank (2).
6. The electro-Fenton device with ultrafiltration function according to claim 1, characterized in that: The device also includes a Roots blower (6) and a microporous aerator (7).
7. The electro-Fenton device with ultrafiltration function according to claim 6, characterized in that: The microporous aerator (7) is arranged in the solid-liquid separation tank (2) and below the ultrafiltration membrane box (5), and the microporous aerator (7) and the Roots blower (6) are connected via a pipeline.
8. The electro-Fenton device with ultrafiltration function according to claim 7, characterized in that: Air is introduced into the solid-liquid separation tank (2) by a Roots blower (6), and forms microbubbles after passing through a microporous aerator (7), thereby dispersing ferrous hydroxide (12) in the solid-liquid separation tank (2).
9. The electro-Fenton device with ultrafiltration function according to claim 1, characterized in that: The device also includes a backwash water tank (8) and a backwash water pump (9).
10. The electro-Fenton device with ultrafiltration function according to claim 9, characterized in that: The inlet pipeline of the backwash water tank (8) and the outlet pipeline of the water production pump (4) are connected via a pipeline, the outlet pipeline and the inlet pipeline of the backwash water pump (9) are connected via a pipeline, and the outlet pipeline of the backwash water pump (9) and the ultrafiltration membrane box (5) are connected via a pipeline.