Electrochemical regeneration device for spent granular activated carbon
By using a separator and a collection basket in the electrochemical regeneration device for waste granular activated carbon, the problems of difficult separation after regeneration and the impact on the lifespan of the catalyst skeleton are solved, thus achieving a highly efficient regeneration effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HEFEI UNIV OF TECH
- Filing Date
- 2026-05-13
- Publication Date
- 2026-06-19
Smart Images
Figure CN224377678U_ABST
Abstract
Description
Technical Field
[0001] This application relates to a regeneration device in the field of regeneration technology, and in particular to an electrochemical regeneration device for waste granular activated carbon. Background Technology
[0002] Existing electrochemical regeneration devices for waste granular activated carbon mix waste granular activated carbon with catalysts and use the waste granular activated carbon directly as the cathode material of the electro-Fenton system, directly generating strong oxidizing substances that completely decompose the organic matter adsorbed on the activated carbon.
[0003] However, existing electrochemical regeneration devices for waste granular activated carbon suffer from difficulties in separation and low recovery rates after regeneration due to the mixed packing of waste granular activated carbon and catalyst. Furthermore, the direct use of waste granular activated carbon as the cathode material in the electro-Fenton system causes the carbon particles themselves to become current transmission channels. Prolonged energization easily triggers hydrogen evolution and thermal effects, leading to micropore collapse and mechanical pulverization, severely impacting the lifespan of the regenerated granular activated carbon skeleton. Utility Model Content
[0004] In order to solve the technical problems of difficult separation after regeneration of waste granular activated carbon and serious impact on the skeleton life of regenerated granular activated carbon, this application provides an electrochemical regeneration device for waste granular activated carbon.
[0005] This application adopts the following technical solution: an electrochemical regeneration device for waste granular activated carbon, comprising:
[0006] The shell contains an electrolyte solution;
[0007] A partition mesh divides the interior of the shell into two interconnected cavities;
[0008] Positive and negative electrode plates are respectively positioned in the two cavities for passing electrolyte solution when direct current is applied;
[0009] Two storage baskets are located in the two cavities respectively; the storage basket between the positive electrode plate and the separator is used to store the waste granular activated carbon to be treated, and the storage basket between the negative electrode plate and the separator is used to store the heterogeneous catalyst; the waste granular activated carbon and the heterogeneous catalyst are immersed in the electrolyte solution.
[0010] As a further improvement to the above solution, the inner wall of the housing is provided with at least one slot for a removable plug-in partition mesh.
[0011] As a further improvement to the above solution, the inner wall of the housing is provided with multiple slots for detachable insertion of positive and negative electrode plates.
[0012] As a further improvement to the above solution, the storage basket is a rigid storage basket made of insulating material with a hole diameter ranging from 0.3 to 1 mm.
[0013] As a further improvement to the above scheme, the waste granular activated carbon electrochemical regeneration device also includes a DC power supply for passing DC current to the positive and negative electrode plates.
[0014] As a further improvement to the above scheme, both the positive and negative electrode plates are parallel to the separator mesh.
[0015] As a further improvement to the above solution, the top of the shell has an opening that communicates with the cavity, and a set of double-opening top covers are hinged to the inner wall near the opening of the shell. The top of the double-opening top covers has a window that communicates with the cavity of the shell.
[0016] As a further improvement to the above scheme, a liquid inlet communicating with the cavity is provided on one side wall of the shell near the top.
[0017] Furthermore, the shell has a liquid outlet that communicates with the cavity near the bottom on the opposite side wall.
[0018] As a further improvement to the above scheme, the aperture of the separator mesh is 0.3-1mm.
[0019] As a further improvement to the above scheme, the separator is made of stainless steel perforated mesh.
[0020] Compared to existing technologies, this novel electrochemical regeneration device for waste granular activated carbon eliminates the use of waste granular activated carbon as the cathode material in the electro-Fenton system. Therefore, the waste activated carbon particles are less likely to become current transmission channels. By using a separating mesh and a collection basket, the waste granular activated carbon and the heterogeneous catalyst are independently confined within their respective fixed areas of the shell. This reduces the difficulty of separating the heterogeneous catalyst and the regenerated granular activated carbon, minimizes the likelihood of hydrogen evolution and thermal effects, and significantly reduces the probability of micropore collapse and mechanical pulverization. Consequently, the lifespan of the regenerated granular activated carbon's framework is effectively guaranteed. Therefore, this invention solves the technical problems of difficult separation of regenerated waste granular activated carbon and the severely compromised lifespan of the regenerated granular activated carbon's framework. Attached Figure Description
[0021] Figure 1 A three-dimensional schematic diagram of the waste granular activated carbon electrochemical regeneration device provided in the embodiment of this utility model.
[0022] Figure 2 for Figure 1 A three-dimensional schematic diagram of a waste granular activated carbon electrochemical regeneration device from another perspective.
[0023] Figure 3 for Figure 1 A partial decomposition diagram of a waste granular activated carbon electrochemical regeneration device.
[0024] Figure 4 for Figure 2 A partial decomposition diagram of a waste granular activated carbon electrochemical regeneration device.
[0025] Figure 5 for Figure 1 A top view of the electrochemical regeneration device for granular activated carbon from medium-waste waste.
[0026] Figure 6 for Figure 5 A cross-sectional view of the electrochemical regeneration device for granular activated carbon in wastewater along section AA.
[0027] Figure 7 To adopt Figure 1 An experiment was conducted on the electrochemical regeneration device for waste granular activated carbon. The results of the heterogeneous catalyst regeneration of waste granular activated carbon after 5 cycles are analyzed. Among them, (a) is the adsorption curve of BPA after the heterogeneous catalyst regeneration of waste granular activated carbon after 5 cycles, (b) is the iodine adsorption value after the heterogeneous catalyst regeneration of waste granular activated carbon after 5 cycles, and (c) is the ion leaching result after the heterogeneous catalyst regeneration of waste granular activated carbon after 5 cycles. Detailed Implementation
[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0029] Unless otherwise defined, the technical or scientific terms used in this application shall have the general meaning understood by one of ordinary skill in the art to which this application pertains. Words such as “a,” “an,” “an,” “the,” “the,” and “these” used in this application do not indicate quantitative limitation and may be singular or plural. The terms “comprising,” “including,” “having,” and any variations thereof used in this application are intended to cover non-exclusive inclusion; words such as “connected,” “linked,” and “coupled” used in this application are not limited to physical or mechanical connections but may include electrical connections, whether direct or indirect. The terms “first,” “second,” and “third” used in this application are merely for distinguishing similar objects and do not represent a specific ordering of objects.
[0030] This embodiment discloses an electrochemical regeneration device for waste granular activated carbon, such as... Figure 1 and Figure 2 As shown, Figure 1 This is a three-dimensional schematic diagram of the electrochemical regeneration device for waste granular activated carbon provided in an embodiment of the present invention. Figure 2 for Figure 1 A three-dimensional schematic diagram of the electrochemical regeneration device for waste granular activated carbon from another perspective. To better demonstrate the internal structure of the device, the upper part of the device is shown in detail, such as... Figure 3 and Figure 4 As shown, Figure 3 for Figure 1 A partial decomposition diagram of a waste granular activated carbon electrochemical regeneration device. Figure 4 for Figure 2 A partially exploded schematic diagram of an electrochemical regeneration device for waste granular activated carbon. The device includes a shell 1, a partition mesh 13, positive and negative electrode plates (i.e., first electrode plate 11 and second electrode plate 12), two storage baskets (i.e., first storage basket 3 and second storage basket 8), and may also include a DC power supply. The shell 1 contains an electrolyte solution; the partition mesh 13 divides the shell 1 into two interconnected cavities; the positive and negative electrode plates are respectively positioned in the two cavities to energize the electrolyte solution when DC power is applied; the two storage baskets are located in the two cavities respectively. The storage basket between the positive electrode plate and the partition mesh 13 is used to store the waste granular activated carbon to be treated, and the storage basket between the negative electrode plate and the partition mesh 13 is used to store the heterogeneous catalyst; the electrolyte solution immerses the waste granular activated carbon and the heterogeneous catalyst.
[0031] Please combine Figure 5 and Figure 6 , Figure 5 for Figure 1 A top view of a waste granular activated carbon electrochemical regeneration unit. Figure 6 for Figure 5 A cross-sectional view of the electrochemical regeneration device for granular activated carbon in wastewater along section AA.
[0032] To facilitate the installation of the partition net 13, at least one slot 14 for detachable insertion of the partition net 13 can be provided on the inner wall of the housing 1. The partition net 13 is detachably inserted into the housing 1 through the slot 14. To ensure the stability of the insertion of the partition net 13, it is recommended that the slots 14 be provided in pairs on two opposite inner walls of the housing 1. Of course, a single slot 14 can also fix the partition net 13 to the inner wall of the housing 1. To adjust the capacity of the two cavities, multiple slots 14 can be provided on one side of the inner wall of the housing 1, or multiple pairs of slots 14 can be provided on the opposite inner walls of the housing 1. By changing the partition net 13 and inserting it into different slots 14, the partition net 13 can divide the housing into two cavities with different capacities. In this embodiment, two symmetrical slots 14 are provided on the opposite inner walls of the housing 1, at a central position, thus dividing the housing into two cavities with basically the same capacity.
[0033] The aperture of the separator mesh 13 is recommended to be 0.3-1mm. In this embodiment, the separator mesh 13 is made of stainless steel mesh with an aperture between 0.3-1mm (stainless steel mesh has bending deformation characteristics). The material itself has certain bending deformation characteristics, which facilitates installation and adaptation. During installation, one edge of the separator mesh 13 is inserted into the slot 14 on the inner wall of the housing 1, and the mesh surface of the separator mesh 13 is kept parallel to the slot 7. In the actual filling layout, the waste granular activated carbon particles to be regenerated are filled between the separator mesh 13 and the electrode plate connected to the positive power supply.
[0034] Similarly, to facilitate the installation of positive and negative electrode plates, multiple slots 7 for detachable insertion of the positive and negative electrode plates can be provided on the inner walls of the two cavities. The positive and negative electrode plates are detachably inserted into the housing 1 through the slots 7 in their respective cavities. In this embodiment, five pairs of symmetrical slots 7 are provided on the opposite inner walls of the two cavities. The five pairs of slots 7 in each cavity allow for five position changes of the corresponding electrode plate. Since the positions of the electrode plates in both cavities can be adjusted, many different position change states can be achieved. It is recommended that both the positive and negative electrode plates be parallel to the partition mesh 13.
[0035] Positive and negative electrode plates, respectively placed in the two cavities on both sides of the separator 13, are used to apply an electric field to the electrolyte solution under direct current (DC) conditions. The DC power supply can be used to supply DC current to the positive and negative electrode plates. The electrode plates can be installed parallel to the separator 13 to facilitate a uniform distribution of the electric field. The positive and negative electrode plates are identical in specifications and material, with their edges corresponding to the pre-set slots 7 on the inner wall of the housing 1, and are respectively connected to the positive and negative output terminals of the DC power supply. The electrode plate connected to the positive terminal of the DC power supply is the positive electrode plate, and the electrode plate connected to the positive terminal of the DC power supply is the negative electrode plate. Before connecting the DC power supply, there is no distinction between positive and negative on the two electrode plates. However, it must be ensured that the storage compartment between the positive electrode plate and the separator 13 is used to store the waste granular activated carbon to be treated, and the storage compartment between the negative electrode plate and the separator 13 is used to store the heterogeneous catalyst.
[0036] When energized, the electrode plates apply a driving electric field to the entire electrochemical reaction system to maintain the continuous electrochemical reaction. Multiple sets of slots 7 are spaced identically, and the distance between the positive and negative electrode plates can be changed by adjusting the position of the electrode plates embedded in the slots 7 according to the user's actual needs. The size of the electrode spacing directly affects the mass transfer efficiency, current density distribution, and polarization degree of the electrodes themselves, and is one of the important parameters for controlling regeneration performance.
[0037] In this embodiment, the first electrode 11 is connected to the negative terminal of the DC power supply, and the second electrode 12 is connected to the positive terminal of the DC power supply. Both the first electrode 11 and the second electrode 12 are made of graphite. The current of the DC power supply is typically constant within the range of 0.05-0.15 amperes (A), with a preferred value of 0.1 amperes. For example, a Q3005sI DC power supply can be used. A current that is too low will lead to a decrease in the regeneration efficiency of the waste granular activated carbon, while a current that is too high will significantly increase unnecessary consumption during the regeneration process. Studies have found that when the electrode spacing gradually increases from 1 cm to 2 cm, there is no significant difference in the regeneration effect of the waste granular activated carbon. However, when the electrode spacing is too small, the electric field strength between the electrodes is too high, which can easily lead to current concentration and electrode short circuits, resulting in excessively vigorous local reactions, increased system temperature, and ultimately damage to the activated carbon's pore structure, weakening the regeneration effect of the waste granular activated carbon. Conversely, when the electrode spacing is too large, the electric field will significantly attenuate, making it difficult for the particle electrodes to achieve sufficient polarization. Simultaneously, mass transfer resistance increases, requiring a higher voltage to maintain a constant current. This voltage increase not only leads to a substantial increase in system energy consumption but also causes uneven distribution of polarization sites on the activated carbon surface, further impairing the regeneration effect. By using a separator mesh to physically isolate the spent activated carbon from the heterogeneous catalyst, they can be independently loaded and kept separate during the regeneration process. After regeneration, the catalyst can be easily removed and directly used in the next batch, resulting in high recovery rates and simple operation. This isolation design also fundamentally eliminates unintended current bypasses caused by disordered contact of conductive carbon particles, ensuring the uniformity and stability of the electric field distribution.
[0038] A fixing plate 6 can be fixed to the inner wall of the shell 1 according to its shape. Multiple slots 7 can be pre-machined on the fixing plate 6, which is then glued to the shell 1. The function of the fixing plate 6 is to fix the positive and negative electrode plates and the separator mesh 13, keeping the spacing between the electrode plates constant. If the distance between the electrode plates needs to be flexibly adjusted according to different working conditions, two fixing plates can be installed, respectively fixed to the opposite inner walls on both sides of the shell 1. This allows the electrode plates and separator mesh to be simultaneously secured from both sides, making the overall structure more stable. The electrolyte solution must cover the upper surface of the waste granular activated carbon and the heterogeneous catalyst. As an ion-conducting medium, the electrolyte solution must maintain charge balance, promote ion migration, and provide a liquid-phase reaction environment for the generation of active species.
[0039] To facilitate the addition of electrolyte or deionized water for cleaning waste granular activated carbon, an inlet communicating with the cavity can be provided on one side wall of the shell 1 near the top. An inlet pipe 4 can be installed at the inlet. The inlet pipe 4 can be an "L"-shaped pipe structure. Before regenerating the waste granular activated carbon, the electrolyte can be injected through the inlet pipe 4 to submerge the heterogeneous catalyst and the surface layer of the waste granular activated carbon. After the regeneration reaction is completed and the electrolyte is discharged, deionized water can also be added through the inlet pipe 4 to clean the regenerated granular activated carbon.
[0040] The shell 1 has a liquid outlet near the bottom on the opposite side wall, which communicates with the cavity. A liquid outlet pipe 10 can be installed at the liquid outlet. This liquid outlet pipe 10 can be equipped with a valve or a sealing plug to discharge the electrolyte after the reaction is completed. When it is necessary to clean the regenerated waste granular activated carbon, the cleaning wastewater can also be discharged through the liquid outlet pipe 10, thereby realizing the controlled entry and exit of the liquid medium and convenient replacement.
[0041] The top of the housing 1 may have an opening communicating with the cavity. This opening facilitates the connection of the electrode wire to the external power supply into the housing and also provides operating space for the replacement of the electrode plates and waste granular activated carbon. A set of double-opening top covers 2 may also be hinged to the inner wall near the opening of the housing 1. The top of the double-opening top covers 2 may also have a window 5 communicating with the cavity of the housing 1. The window 5 allows the connection of an external power supply into the housing 1. The double-opening top covers 2 can be divided into two sections, which can be opened or closed from either side. Each double-opening top cover 2 has a hand groove near its side for easy finger insertion and force application; the top cover can be opened and closed flexibly by pulling or pressing.
[0042] The storage basket can be a rigid basket made of insulating material. The basket walls can be evenly perforated with micropores similar to those of the dividing mesh, preferably with a pore size of 0.3-1 mm (since the pore size of intact granular activated carbon is 1 mm, even if it breaks, the fragment size is usually greater than 0.5 mm). At least one handle 9 can be provided on the inner wall near the upper edge of the storage basket for easy handling. One handle 9 can be provided, or two can be symmetrically arranged to further enhance the convenience of lifting and carrying.
[0043] When selecting a heterogeneous catalyst, modified granular activated carbon is the preferred choice: granular activated carbon with a copper-iron composite oxide layer supported on its surface (the precursor of the copper-iron composite oxide layer can be a composite of copper nitrate trihydrate Cu(NO3)2•3H2O and ferric nitrate nonahydrate (Fe(NO3)3•9H2O), and the copper-iron composite oxide layer can include Cu(NO3)2•3H2O and (Fe(NO3)3•9H2O)), abbreviated as CuFe2O4@GAC. The copper-iron molar ratio in the copper-iron composite oxide layer is preferably fixed at 1:2. Because with such a heterogeneous catalyst, under the influence of an electric field, the heterogeneous catalyst can generate active species, thereby oxidizing and decomposing the organic pollutants clogging the pores of the waste granular activated carbon.
[0044] When using this novel electrochemical regeneration device for waste granular activated carbon, it is recommended to add the waste granular activated carbon and heterogeneous catalyst at a weight ratio of 1:1, with both completely submerged below the surface of the electrolyte solution. This allows for the regeneration of at least five batches of waste granular activated carbon using the same batch of heterogeneous catalyst. This design of the waste granular activated carbon electrochemical regeneration device is highly significant; otherwise, regenerating waste granular activated carbon by consuming new granular activated carbon defeats the economic logic of regeneration, making it less meaningful and more cost-effective to simply use new granular activated carbon instead of regenerating the waste.
[0045] To verify the feasibility of the electrochemical regeneration device for waste granular activated carbon of this invention, a heterogeneous catalyst with a copper-iron molar ratio of 1:2 in the copper-iron composite oxide layer was used, and the waste granular activated carbon was added to the heterogeneous catalyst at a weight ratio of 1:1 for testing.
[0046] In this experiment, the operator first lifts the double-opening top cover 2 and inserts the separator mesh 13 into the pre-set slot 14 on the inner wall of the shell 1. The separator mesh 13 can be made of stainless steel, with dimensions of 2.5*6cm. Then, the first electrode sheet 11 and the second electrode sheet 12 are symmetrically inserted into their corresponding slots 7. Both the first electrode sheet 11 and the second electrode sheet 12 are graphite sheet electrodes, with dimensions of 2.5*7.5cm, maintaining a distance of 2-3cm between them. After assembling the above structure, 2g of modified granular activated carbon CuFe2O4@GAC, used as a heterogeneous catalyst, is weighed and placed in the corresponding area between the separator mesh 13 and the first electrode sheet 11 at the bottom of the shell 1. Simultaneously, another 2g of waste granular activated carbon is weighed and placed in the corresponding area between the separator mesh 13 and the second electrode sheet 12 at the bottom of the shell 1.
[0047] In other words, the heterogeneous catalyst is added to the first storage basket 3, and the basket is placed between the first electrode plate 11 and the separator 13 by pulling up the handle 9, and then placed at the bottom of the shell 1. Then, an equal amount of waste granular activated carbon is weighed and placed into the second storage basket 8. It is placed in the same manner at the bottom of the shell 1, in the area between the separator 13 and the second electrode plate 12. After the materials are filled, sodium sulfate electrolyte solution is added to the shell 1 through the liquid inlet 4 until the liquid surface completely submerges the surface of the heterogeneous catalyst and the waste granular activated carbon. Before starting the electrostatic reaction, it is best to adjust the pH of the electrolyte solution in the shell 1 to 3 using sulfuric acid and sodium hydroxide solution, and let it stand for 3 minutes to allow it to stabilize. Then, the double-opening top cover 2 is closed, and the cathode electrode clamp of the Q3005sI DC power supply is connected to the first electrode plate 11 through the window 5, and the anode electrode clamp of the Q3005sI DC power supply is connected to the second electrode plate 12. After turning on the DC power supply, adjust the output voltage until the current value is stably displayed at 0.1 amperes. At this point, the electrochemical reaction officially starts, and the reaction type is an electro-Fenton process.
[0048] The timer starts three hours after power-on, during which the voltage needs to be adjusted as needed to maintain a constant current of 0.1 amperes. After the timer finishes, the DC power supply is turned off, and the electrochemical reaction ends. At this point, the electrode clamps can be removed. The electrolyte solution after the reaction is complete can be adjusted to pH 3 and reused to reduce the impact of electrolyte solution consumption. If waste electrolyte solution needs to be discharged, the outlet pipe 10 can be opened to discharge the waste electrolyte solution outside the shell 1. After the waste electrolyte solution is discharged, fresh electrolyte solution is injected into the shell 1 for the next batch operation. Modified granular activated carbon exhibits good reusability in this system; the same batch of modified granular activated carbon can continuously serve the regeneration of five batches of waste granular activated carbon without replacement. After regenerating five batches of waste granular activated carbon, due to the trace loss of active sites in the heterogeneous catalyst and the cumulative effect of pores, the iodine adsorption value of the modified granular activated carbon will decrease to some extent, correspondingly reducing its regeneration efficiency for waste granular activated carbon. At this point, the modified granular activated carbon needs to be replaced.
[0049] Modified granular activated carbon CuFe2O4@GAC, a heterogeneous catalyst, is commercially available, and can also be fabricated to achieve a suitable copper-iron molar ratio. A typical preparation process for heterogeneous catalysts is as follows: First, granular activated carbon, purified by acid washing and neutralized, is selected as the carrier. Copper and iron salts are dissolved in deionized water at a predetermined molar ratio to prepare a precursor solution. The copper salt can be copper nitrate trihydrate (Cu(NO3)2•3H2O), and the iron salt can be ferric nitrate nonahydrate (Fe(NO3)3•9H2O). Then, granular activated carbon is added and ultrasonically dispersed to ensure the precursor fully adheres to the pore surface of the activated carbon. In an alkaline environment, the mixture is transferred to a reactor for hydrothermal crystallization. After natural cooling, it is washed to neutrality and dried to obtain modified granular activated carbon with a copper-iron composite oxide layer on its surface. The preparation process can be refined as follows: 0.1 mol copper nitrate trihydrate and 0.2 mol ferric nitrate nonahydrate are dissolved in 15 mL of deionized water and stirred for 15 min to form a precursor solution. 8 g of acid-washed and neutralized granular activated carbon is added to this solution and ultrasonically dispersed for 15 min. Separately, 0.2 mol NaOH is dissolved in 60 mL of deionized water and slowly added to the above mixture, which is then allowed to stand for 15 min. Finally, the entire mixture is transferred to a 100 mL reactor and hydrothermally treated at 180 °C for 15 h. After cooling, the mixture is removed, washed with deionized water until pH neutral, and dried to obtain CuFe₂O₄@GAC. It should be understood that this step is merely an example of one route to obtain a heterogeneous catalyst and is not intended to limit the scope of the process.
[0050] The test results are as follows Figure 7 As shown in (a) and (b), after five regeneration cycles of waste granular activated carbon, the adsorption capacity of modified granular activated carbon for bisphenol A (BPA) gradually decreased with increasing regeneration cycles, with a single-cycle attenuation ranging from 8% to 18%. This slight decline in adsorption performance is mainly attributed to the incomplete recovery of activated carbon pores after multiple regenerations, the accumulation of small amounts of contaminants and intermediate products, and a reduction in surface active sites. Nevertheless, even after five cycles, the regeneration rate of the modified granular activated carbon still reached 52.3%, and the iodine adsorption value recovered to 610 mg / g, demonstrating excellent cycle stability and regeneration effect. The electrolyte solution can be sodium sulfate (Na2SO4) to provide an ion-conducting medium, maintaining charge balance and ion migration. Figure 7Analysis of the results in (c) shows that during the five regeneration cycles of modified granular activated carbon, the leaching of copper and iron ions in the electrolyte was most pronounced after the first regeneration cycle, with iron ions leaching out more. After subsequent reactions, the leaching amounts of Cu and Fe ions stabilized, remaining below 2 mg / L, which meets the surface water discharge standards stipulated by the EU and China. This demonstrates that using modified granular activated carbon in heterogeneous catalysts offers high regeneration efficiency, strong practicality, and reduces the regeneration cost of waste granular activated carbon, resulting in good economic benefits.
[0051] This experiment demonstrates the significant advantages of the electrochemical regeneration device for waste granular activated carbon of this invention: it eliminates the need for catalyst replenishment with each batch because the heterogeneous catalyst selected in this invention contains metal active sites, thus enabling in-situ electrocatalysis to generate active groups that completely oxidize and decompose pollutants adsorbed within the pores of the waste activated carbon. The degradation products are discharged in the form of harmless small molecules, leaving no harmful residues. This avoids the contamination of activated carbon surface by metal hydroxide precipitation at the source, eliminates the generation of secondary hazardous waste, and is environmentally friendly. Furthermore, the catalyst can be repeatedly recycled, resulting in high material utilization and reducing the operating cost per unit mass of waste carbon regeneration.
[0052] In summary, this invention eliminates the use of spent granular activated carbon as the cathode material in the electro-Fenton system. Therefore, the spent activated carbon particles are less likely to become current transmission channels. By using a separating mesh and a collection basket, the spent granular activated carbon and the heterogeneous catalyst are independently confined within their respective fixed areas of the shell. This reduces the difficulty of separating the heterogeneous catalyst and the regenerated granular activated carbon, minimizes the likelihood of hydrogen evolution and thermal effects, and significantly reduces the probability of micropore collapse and mechanical pulverization. Consequently, the lifespan of the regenerated granular activated carbon is effectively guaranteed. Therefore, this invention solves the existing technical problems of difficult separation of spent granular activated carbon after regeneration and the severe impact on the lifespan of the regenerated granular activated carbon.
[0053] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0054] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.
Claims
1. An electrochemical regeneration device for waste granular activated carbon, characterized in that: include: The shell (1) contains an electrolyte solution; A partition net (13) divides the interior of the shell (1) into two interconnected cavities; Positive and negative electrode plates are respectively positioned in the two cavities for passing electrolyte solution when direct current is applied; Two storage baskets are located in the two cavities respectively; the storage basket between the positive electrode plate and the separator (13) is used to store the waste granular activated carbon to be treated, and the storage basket between the negative electrode plate and the separator (13) is used to store the heterogeneous catalyst; the waste granular activated carbon and the heterogeneous catalyst are immersed in the electrolyte solution.
2. The electrochemical regeneration device for waste granular activated carbon according to claim 1, characterized in that: The inner wall of the housing (1) is provided with at least one slot (14) for a removable plug-in partition mesh (13).
3. The electrochemical regeneration device for waste granular activated carbon according to claim 1, characterized in that: The inner wall of the housing (1) is provided with multiple slots (7) for detachable insertion of positive and negative electrode plates.
4. The electrochemical regeneration device for waste granular activated carbon according to claim 1, characterized in that: The storage basket is a rigid storage basket made of insulating material with a hole diameter ranging from 0.3 to 1 mm.
5. The electrochemical regeneration device for waste granular activated carbon according to claim 1, characterized in that: The waste granular activated carbon electrochemical regeneration device also includes a DC power supply for passing DC current to the positive and negative electrode plates.
6. The electrochemical regeneration device for waste granular activated carbon according to claim 1, characterized in that: Both the positive and negative electrode plates are parallel to the separator mesh (13).
7. The electrochemical regeneration device for waste granular activated carbon according to claim 1, characterized in that: The top of the shell (1) has an opening that communicates with the cavity. A set of double-opening top covers (2) are hinged to the inner wall near the opening of the shell (1). The top of the double-opening top covers (2) has a window (5) that communicates with the cavity of the shell (1).
8. The electrochemical regeneration device for waste granular activated carbon according to claim 1, characterized in that: The shell (1) has a liquid inlet on one side wall near the top that communicates with the cavity.
9. The electrochemical regeneration device for waste granular activated carbon according to claim 8, characterized in that: The shell (1) has a liquid outlet that communicates with the cavity near the bottom on the opposite side wall.
10. The electrochemical regeneration device for waste granular activated carbon according to claim 1, characterized in that: The aperture of the separator (13) is 0.3-1 mm; And / or, the separator (13) is a stainless steel perforated mesh.