Heterogeneous (electric) Fenton reaction device
By electrolyzing hydrogen peroxide in a heterogeneous (electrical) Fenton reaction device and combining heterogeneous Fenton technology, the problems of pH adjustment, iron sludge generation and hydrogen peroxide transportation costs in traditional Fenton oxidation are solved, and efficient pollution degradation is achieved and reduce the cost of processing.
Patent Information
- Application Number
- CN202323349899.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-08
- Publication Date
- 2025-02-25
- Estimated Expiration
- 2033-12-08
AI Technical Summary
The traditional Fenton oxidation method requires a large amount of acid and alkali to adjust the pH value when treating wastewater under acidic conditions, which increases economic costs. In addition, the iron salt catalyst is prone to form iron sludge after the reaction is over, and there is a lack of good disposal method. At the same time, the transportation of hydrogen peroxide and Storage also has security and economic costs.
Design a heterogeneous (electric) Fenton reaction device to generate hydrogen peroxide by electrolysis and load iron salt on the catalyst support. Combined with heterogeneous Fenton technology, the transportation and storage costs of hydrogen peroxide are reduced, and the catalyst is realized. Reuse.
The device can effectively degrade pollutants within a wide pH range, reduce the need for acid-base regulation, reduce the generation of iron sludge, realize the reuse of catalysts, reduce the treatment cost, and reduce the safety and economicality of hydrogen peroxide cost.
Smart Images
Figure CN222524695U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of heterogeneous (electric) Fenton water treatment, in particular to a heterogeneous (electric) Fenton reaction device. Background Art
[0002] Fenton oxidation is a type of advanced oxidation technology, which has the characteristics of high treatment efficiency, fast reaction speed, and green environmental protection. The principle of Fenton oxidation can be summarized as: the generation of free radicals and the circulation of iron ions. Ferrous ions react with hydrogen peroxide to generate hydroxyl radicals with strong oxidizing properties, which can oxidize and decompose difficult-to-degrade pollutants and mineralize into water and carbon dioxide. Ferrous ions react with hydrogen peroxide to generate ferrous ions again, so that the Fenton reaction can continue. However, the traditional Fenton oxidation method needs to be carried out under acidic conditions of pH=3. In actual wastewater treatment, a large amount of acid and alkali needs to be added to adjust the pH value, which increases the economic cost. On the other hand, the iron salt used as a catalyst in the reaction is prone to form iron sludge after the reaction, and a separation step needs to be added. At present, there is no good disposal method for iron sludge.
[0003] Heterogeneous Fenton technology is based on Fenton technology. Its principle is to load iron salts on a carrier and use Fe 2+ Solid phase catalyst to replace the traditional liquid phase Fe 2+ This can greatly avoid the shortcomings of traditional Fenton oxidation technology, such as narrow pH range, inability to recover active components, and iron sludge production. However, like the traditional Fenton oxidation method, additional hydrogen peroxide is still required during the reaction to keep the Fenton reaction going. The strong oxidizing, corrosive, flammable and explosive properties of hydrogen peroxide make the transportation and storage of hydrogen peroxide cost a lot of money.
[0004] The electrolytic production of H2O2 has the advantages of fast reaction speed and high product purity. The principle is that oxygen undergoes a reduction reaction at the cathode, loses electrons, and produces hydrogen peroxide. Utility Model Content
[0005] The problem solved by the utility model is to provide a heterogeneous electro-Fenton device which can generate hydrogen peroxide by electrolysis inside a pipeline.
[0006] In order to solve the above problems, the technical solution adopted by the utility model is:
[0007] 1. A heterogeneous (electric) Fenton reaction device, which is composed of a special pipeline device for electrolytic production of hydrogen peroxide and a heterogeneous Fenton reactor. The special pipeline device for electrolytic production of hydrogen peroxide is composed of a pipeline wall, an anode, a cathode, an aeration device and a dosing port; the heterogeneous Fenton reactor is composed of a packing area partition, a heterogeneous Fenton catalyst, a water outlet and a backwashing inlet and outlet; the heterogeneous Fenton catalyst is prepared by loading iron on a catalyst carrier; the water outlet ensures that the wastewater can flow out smoothly, and the backwashing inlet and outlet are used to backwash the heterogeneous Fenton catalyst.
[0008] 2. The cathode and cathode of the electrolytic hydrogen peroxide production device are a columnar DSA anode, which is horizontally placed in the center of the special pipeline device for electrolytic hydrogen peroxide production, and a carbon felt cathode, which surrounds the DSA anode and is placed in the pipeline, keeping a certain distance from the pipeline wall of the special pipeline device. The utility model takes into account that the spatial structure of the electrolytic hydrogen peroxide production will affect the degradation effect of pollutants. In order to improve the degradation ability of pollutants, a surrounding spatial structure is adopted to generate more H2O2.
[0009] 3. The aeration device is evenly placed around the carbon felt cathode in a special pipeline device for electrolytic hydrogen peroxide production, close to the pipeline wall, to fully aerate the cathode.
[0010] 4. When the pH of the solution is not conducive to meeting the requirements of the heterogeneous Fenton reactor, acid and alkali are added at the dosing port, which is located on the pipeline connecting the special pipeline device for electrolytic hydrogen peroxide production and the heterogeneous Fenton reactor.
[0011] 5. The heterogeneous Fenton reactor consists of a packing area partition, a heterogeneous Fenton catalyst, a water outlet, and a backwash inlet and outlet. When the wastewater flows from the special pipeline device for electrolysis to produce hydrogen peroxide to the heterogeneous Fenton reactor, it passes through the cathode and aeration device. The packing area is filled with iron-loaded heterogeneous Fenton catalyst. The wastewater with hydrogen peroxide flows to the heterogeneous Fenton reactor, and a heterogeneous Fenton reaction occurs. The strong oxygen hydroxyl free radicals produced degrade the pollutants. After the reaction, the water is discharged from the outlet located at the top of the device.
[0012] 6. The backwash water inlet is set at the top of the heterogeneous Fenton reactor, and the backwash water outlet is set at the bottom of the heterogeneous Fenton reactor. Clean water passes through the backwash water inlet to clean the catalyst in the packing area and flows out from the backwash water outlet to ensure the catalytic activity of the catalyst in the packing area.
[0013] 7. The packing area is filled with heterogeneous Fenton catalyst, and perforated baffles are provided above and below the packing area to allow wastewater to pass through.
[0014] 8. The utility model combines electrolytic hydrogen peroxide production with heterogeneous Fenton technology to produce a heterogeneous (electric) Fenton reaction device, which reduces the safety problems encountered during the production and transportation of hydrogen peroxide. Electrolytic hydrogen peroxide flows through a pipeline into a heterogeneous Fenton reactor, and H2O2 reacts with a heterogeneous Fenton catalyst to generate ·OH, which oxidizes and degrades organic pollutants in the solution.
[0015] The main advantages of this utility model are:
[0016] (1) The anode and cathode are placed in a surrounding manner, which overcomes the disadvantage of the small effective area of the cathode. The surrounding arrangement increases the effective utilization area of the anode and cathode to produce more H2O2.
[0017] (2) The utility model can realize the reuse of the catalyst and ensure the service life of the heterogeneous Fenton reaction device through the backwashing process, thereby reducing the processing cost of the device.
[0018] (3) Placing the electro-Fenton electrode in the pipeline reduces the footprint of the electro-Fenton reaction device, and connecting the device through the pipeline saves the manufacturing cost of the reaction device.
[0019] (4) The utility model adopts electrolysis to produce hydrogen peroxide, which reduces the safety problems encountered in the production and transportation of hydrogen peroxide. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 It is a schematic diagram of the overall structure of the heterogeneous (electric) Fenton reaction device of the utility model;
[0021] Figure 2 It is a schematic diagram of the structure of the cathode and anode of the heterogeneous (electric) Fenton reaction device of the utility model.
[0022] The meanings of the symbols in the accompanying drawings are as follows:
[0023] 1—aeration device; 2—pipe wall; 3—DSA anode; 4—carbon felt cathode; 5—heterogeneous Fenton catalyst; 6—perforated partition in the packing area. DETAILED DESCRIPTION
[0024] The utility model is described in detail below with reference to the accompanying drawings and specific embodiments.
[0025] Example 1
[0026] A heterogeneous (electro) Fenton reaction device was used to treat coking wastewater. The voltage of the electrolysis to produce hydrogen peroxide was set to 8V, the wastewater flow rate was 500mL / min, the heterogeneous Fenton reactor was filled with iron-loaded alumina heterogeneous catalyst, the pH was adjusted to 6, the treatment time was 3h, and the backwash time was set to 30min each time. During the 30 reaction processes, the COD removal rate could be maintained at 76.2%.
[0027] Example 2
[0028] A heterogeneous (electro) Fenton reaction device was used to treat coking wastewater. The voltage of the electrolysis to produce hydrogen peroxide was set to 8V, the wastewater flow rate was 500mL / min, and the heterogeneous Fenton reactor was filled with iron-loaded granular activated carbon heterogeneous catalyst. The pH was adjusted to 5, the single treatment time was 3h, and the backwash time was set to 30min each time. In the 50 reaction processes, the COD removal rate could be maintained at 87.3%.
[0029] Example 3
[0030] The configuration in Example 2 was used to treat coking wastewater, the voltage was changed to 9V, the reaction time was set to 4h, and the COD removal rate fluctuated around 95.9%.
[0031] Example 4
[0032] A heterogeneous (electric) Fenton reaction device was used to treat landfill leachate. The voltage of the electrolysis to produce hydrogen peroxide was set to 9V, the wastewater flow rate was 500mL / min, the heterogeneous Fenton reactor was filled with iron-loaded particles and active heterogeneous catalysts, the pH was adjusted to 5, the single treatment time was 4h, and the backwash time was set to 30min each time. In the 50 reaction processes, the COD removal rate could be maintained at 90%.
[0033] The above examples show that the invention has a good effect on the degradation of difficult-to-degrade wastewater.
[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims
1. A heterogeneous (electro) Fenton reaction device, characterized in that: include: Special piping devices and heterogeneous Fenton reactors for electrolytic production of hydrogen peroxide; The special pipeline device for producing hydrogen peroxide by electrolysis is composed of a pipeline wall (2), an anode (3), a cathode (4), an aeration device (1) and a drug addition port; The heterogeneous Fenton reactor is composed of a packing zone partition plate (6), a heterogeneous Fenton catalyst (5), a water outlet, and a backwash inlet and outlet; The heterogeneous Fenton catalyst (5) is prepared by loading iron on a catalyst carrier; The water outlet ensures that wastewater can flow out smoothly, and the backwash water inlet and outlet are used to perform backwashing operations on the heterogeneous Fenton catalyst (5).
2. A heterogeneous (electro) Fenton reaction device according to claim 1, characterized in that: The anode (3) is a columnar DSA anode, which is horizontally placed in the center of the special pipeline device for electrolyzing hydrogen peroxide.
3. A heterogeneous (electro) Fenton reaction device according to claim 1, characterized in that: The cathode (4) is a carbon felt, which surrounds the DSA anode (3) and is placed in the pipeline, keeping a certain distance from the pipeline wall (2).
4. A heterogeneous (electro) Fenton reaction device according to claim 1, characterized in that: The aeration device (1) is evenly placed around the cathode (4) in the special pipeline device for electrolyzing hydrogen peroxide, and is arranged close to the pipeline wall (2) to fully aerate the cathode (4).
5. A heterogeneous (electro) Fenton reaction device according to claim 1, characterized in that: When the pH value of the solution is not conducive to meeting the requirements of the heterogeneous Fenton reactor, acid and alkali are added at the dosing port, and the dosing port is located on the pipeline connecting the special pipeline device for electrolysis of hydrogen peroxide and the heterogeneous Fenton reactor.
6. A heterogeneous (electro) Fenton reaction device according to claim 1, characterized in that: The backwash water inlet is arranged at the top of the heterogeneous Fenton reactor, and the backwash water outlet is arranged at the bottom of the heterogeneous Fenton reactor. Clean water flows in through the backwash water inlet and flows out from the backwash water outlet, thereby ensuring the catalytic activity of the catalyst in the packing area.
7. A heterogeneous (electro) Fenton reaction device according to claim 1, characterized in that: The packing area is filled with a heterogeneous Fenton catalyst (5), and partitions (6) with holes are arranged above and below the packing area to allow wastewater to pass through.