Electrochemical catalytic modification of activated carbon adsorbent regeneration and high salt wastewater simultaneous treatment system and method

Abstract

The application focuses on the problem of high-salt and high-alkali organic wastewater treatment, and provides a system and method for simultaneous treatment of electrochemical catalytic modified activated carbon adsorbent regeneration and high-salt wastewater. The process integrates activated carbon adsorption and electrochemical regeneration steps, and uses modified activated carbon as adsorbent and catalyst, catalyzes the adsorption and desorption regeneration cycle process, greatly reduces the cost of wastewater treatment, solves the problem of difficult electrochemical degradation of organic pollutants under high-salt and strong-alkali conditions, and the problem of easy production of toxic and harmful side reactions. The treated industrial wastewater is high-salt wastewater generated in the production process of lithium batteries. Using the process, the low-cost green and efficient degradation and treatment of organic pollutants in high-salt wastewater are realized.

Description

Technical Field

[0001] The present invention relates to the field of high-salt and high-alkali organic wastewater treatment, specifically a system and method for regenerating an electrochemically catalytically modified activated carbon adsorbent and simultaneously treating high-salt wastewater. The system reduces process water treatment volume, shortens regeneration time, and reduces energy costs. It can simultaneously desorb activated carbon and degrade organic matter, achieving significant water treatment results. Background Art

[0002] High-salt and high-alkali organic wastewater not only contains high concentrations of Na + , Ca 2+ , K + , Cl - , SO4 2- The complex composition of various soluble inorganic ion salts, as well as various other organic pollutants, presents a complex pollution pattern. To reduce the difficulty of subsequent recovery of inorganic salt components in wastewater, it is often necessary to degrade or remove the organic components in the wastewater in advance. The high salt and strong alkaline conditions make conventional biological and physical and chemical treatment methods ineffective or costly.

[0003] Due to its rich pore structure and surface functional groups, large specific surface area, and excellent chemical and physical adsorption properties, activated carbon can effectively reduce various indicators in various wastewaters, regardless of temperature and influent water quality fluctuations. It is particularly advantageous in the deep removal of organic pollutants. Compared with other technologies, activated carbon adsorption technology is the most cost-effective, low-energy, and pollution-free green water treatment technology, offering low investment and rapid results. Electrochemical regeneration, as a new activated carbon regeneration technology, offers simple operation, high regeneration efficiency, a wide range of operational possibilities, and promising application prospects. Electrochemical oxidation is an effective method for degrading organic pollutants. Organic pollutant molecules in wastewater are directly oxidized and degraded at the anode or through reaction with radicals such as hydroxyl radicals and superoxide radicals generated at the cathode, ultimately converting them into carbon dioxide, water, and some inorganic ions. With its clean, efficient, and highly controllable advantages, electrochemical solutions effectively overcome the shortcomings of traditional methods.

[0004] The present invention designs a water treatment process that integrates modified activated carbon adsorption and electrochemical treatment with simple operation and effective treatment. First, modified activated carbon is used to adsorb organic pollutants in high-salt and high-alkali wastewater. The adsorbed activated carbon is drained and then transferred to an electrochemical system for desorption and regeneration, and the degradation of organic pollutants is completed. This solves the problems of long treatment time and high treatment cost of high-salt and high-alkali wastewater, and the possible harmful side reactions caused by direct electrochemical treatment, thereby achieving the effect of removing organic matter from wastewater and recycling energy. Summary of the Invention

[0005] In response to the above-mentioned problem that existing treatment processes are unable to achieve the degradation of organic matter in high-salt wastewater, the present invention aims to provide a system and method for the regeneration of electrochemically catalytically modified activated carbon adsorbent and simultaneous treatment of high-salt wastewater. This process integrates two steps: activated carbon adsorption and activated carbon electrochemical regeneration. The use of this step-by-step integrated process for treating organic matter in brine solves the problem of difficulty in removing organic pollutants in high-salt wastewater. This process utilizes activated carbon adsorbents to enrich and concentrate organic matter in high-salt wastewater, and the desorption liquid regenerates the activated carbon adsorbent to achieve the reuse of the activated carbon adsorbent; the electrochemical process degrades the organic matter desorbed from the activated carbon under the mild conditions of the desorption liquid, reduces the occurrence of side reactions in a high-salt environment, completes the degradation of organic matter in brine, and achieves the regeneration of activated carbon at the same time. The present invention is a feasible method for degrading organic matter in high-salt wastewater that is simple to operate and low in cost.

[0006] The present invention is achieved through the following technical solutions:

[0007] An electrochemical catalytic modified activated carbon adsorbent regeneration and high-salt wastewater synchronous treatment system, including an adsorption tank 4 and a device for electrochemical catalytic degradation of organic pollutants and regeneration of activated carbon

[0008] The adsorption tank 4 is used to store high-salt wastewater, and the activated carbon adsorbent 3 adsorbs organic matter in the high-salt wastewater to achieve high-salt wastewater treatment;

[0009] After the activated carbon adsorbent 3 adsorbs organic matter in the high-salt wastewater in the adsorption tank 4, it is used as the activated carbon desorbent 8 of the device for electrochemically catalytically degrading organic pollutants and regenerating activated carbon, thereby realizing the electrochemical catalytic adsorption regeneration of the modified activated carbon adsorbent.

[0010] The device for electrochemically catalytically degrading organic pollutants and regenerating activated carbon is divided into two reaction chambers, large and small, with the small reaction chamber contained within the large reaction chamber. The large reaction chamber is a desorption tank 14, which is used to carry the desorption liquid and regenerate the activated carbon. The small reaction chamber is the cathode chamber 11, which is a porous, water-permeable structure. The pore size of the water-permeable pores 10 is smaller than the particle size of the activated carbon desorbent 8, ensuring that the desorption liquid fully infiltrates the activated carbon desorbent 8 inside and preventing it from escaping. The activated carbon desorbent 8 is tightly packed in the cathode chamber 11 (to ensure smooth electron transfer and stable current), with one end of a conductive cathode electrode 9 inserted inside, and the other end of the conductive cathode electrode 9 is connected to the negative pole of a DC power supply 12. The air pump 6 aerates the bottom of the cathode chamber 11 through the aeration head 7, providing sufficient oxygen for the electrochemical catalytic degradation process, and stirring the desorption liquid near the activated carbon desorbent 8 to promote the activated carbon desorption and regeneration process. One end of the conductive anode electrode 13 is led out from the positive electrode of the DC power supply 12 , and the other end is inserted into the desorption liquid of the desorption cell 14 , away from one end of the cathode chamber 11 .

[0011] Furthermore, the size of the desorption cell 14 is 3-10 times the size of the cathode chamber 11;

[0012] Furthermore, the DC power supply voltage is set to 0.3-1.0V;

[0013] Furthermore, the conductive cathode electrode 9 and the conductive anode electrode 13 are conductive materials such as carbon rods or carbon fiber cloth;

[0014] Furthermore, the conductive cathode electrode 9 and the conductive anode electrode 13, except for the parts in contact with the activated carbon and the desorption liquid, are treated with waterproofing, insulation and anti-electricity treatment to improve the efficiency of electron transmission, for example, by wrapping and covering the conductive material with waterproof tape;

[0015] Furthermore, the desorption liquid is an electrolyte solution of 0.5-1.5 mol / L Na2SO4 or K2SO4;

[0016] Furthermore, the amount of desorption liquid used is 10-30 mL / g activated carbon desorbent;

[0017] A method for regenerating an electrochemically catalytically modified activated carbon adsorbent and simultaneously treating high-salinity wastewater involves placing a permeable container containing the activated carbon adsorbent in the wastewater from an adsorption tank for adsorption. After adsorption, the saturated activated carbon is removed and drained, and fresh activated carbon is used for adsorption. Simultaneously, the adsorbed activated carbon is placed in a desorption tank for electrochemical treatment to degrade the desorbed organic pollutants and regenerate the activated carbon. After adsorption and desorption, the two pools of activated carbon are swapped. The adsorbed activated carbon is regenerated in the desorption tank, and the regenerated activated carbon is returned to the adsorption tank for further adsorption. Each swap requires draining, and the process is repeated until the wastewater meets standards.

[0018] The specific steps are as follows:

[0019] (1) Using a permeable container filled with activated carbon adsorbent 3, immersing it in high-salt wastewater for adsorption;

[0020] (2) After step (1) is completed, the activated carbon adsorbent 3 is removed from the adsorbed high-salt wastewater and drained;

[0021] (3) Take another permeable container consistent with step (1) and fill it with new activated carbon adsorbent 3, immerse it in high-salt wastewater, perform adsorption, and repeat step (1);

[0022] (4) Using an electrochemical catalytic decomposition device for organic pollutants and activated carbon regeneration to treat the desorption liquid and simultaneously regenerate the activated carbon adsorbent. The activated carbon adsorbent 3 after adsorption in step (2) is filled into the cathode chamber 11 as the activated carbon desorbent 8, so that it is decomposed and regenerated there. At the same time, the decomposed organic matter is degraded and removed;

[0023] (5) After step (4) is completed, the activated carbon desorbent 8 is taken out from the desorption liquid and drained to obtain the regenerated activated carbon adsorbent 3, which is then exchanged with the activated carbon adsorbent 3 soaked in the wastewater in step (3) to perform the adsorption process again;

[0024] (6) After step (3) is completed, the activated carbon adsorbent 3 after adsorption is removed from the wastewater, drained, and added to the device for electrochemical catalytic degradation of organic pollutants and regeneration of activated carbon described in step (4) for desorption and regeneration;

[0025] (7) Repeat steps (5) and (6) in a cycle to achieve the recycling and regeneration of the activated carbon adsorbent until the COD of the wastewater in the system meets the requirements for desalination treatment.

[0026] In the step (1), the water-permeable container is a flexible filter screen or a porous rigid container, and the pore size d is ≤ 1 mm;

[0027] In step (1), the activated carbon adsorbent is cobalt- and cerium-doped activated carbon (CoCe / AC) or other preferred activated carbon adsorbents. Furthermore, the preparation method of the activated carbon adsorbent 3 is as follows:

[0028] A sufficient amount of granular activated carbon was ultrasonically washed with water until no carbon powder fell off. The washed activated carbon was then immersed in an ethanol solution to remove organic matter adhering to the surface. The carbon was then drained, washed with water until neutral, and dried overnight to obtain a washed activated carbon, designated AC. Co(NO3)2 and Ce(NO3)2 were then added to deionized water, followed by melamine and stirred to obtain a homogeneous solution. A certain amount of the washed activated carbon was mixed with the homogeneous solution by an equal volume immersion method and ultrasonically treated. The dried granules were then dried in a forced air drying oven overnight. These dried granules were then calcined in a muffle furnace to produce a carbonaceous material with excellent catalytic activity, designated CoCe / AC.

[0029] Furthermore, the diameter of the granular activated carbon d = 0.5 ~ 2.0mm;

[0030] Furthermore, the ethanol solution is alcohol or industrial alcohol with a volume fraction of 65 to 95%;

[0031] Furthermore, the activated carbon is immersed in the ethanol solution for 10 to 12 hours;

[0032] Furthermore, the total mass fraction of the metal salt in the homogeneous solution is 2.5 to 5.0 wt%;

[0033] Furthermore, the amount of Co(NO3)2 used is 0.5% to 1% of the mass of the activated carbon washed with water;

[0034] Furthermore, the amount of Ce(NO3)2 used is 1% to 5% of the mass of the activated carbon washed with water;

[0035] Furthermore, the mass fraction of melamine in the homogeneous solution is 1.5 to 2.5 wt%;

[0036] Furthermore, the activated carbon and the homogenized solution are ultrasonically treated for 20 to 30 minutes;

[0037] Furthermore, the drying temperature is 70-85°C and the drying time is 12-16 hours;

[0038] Furthermore, the calcination temperature of the muffle furnace is 400°C to 500°C;

[0039] Furthermore, the muffle furnace calcination heating rate is set to 4.8 ~ 5.2 ° C / min;

[0040] Furthermore, the muffle furnace annealing temperature calcination treatment time is 2 to 4 hours;

[0041] In the step (1), the amount of activated carbon adsorbent used is 100 g / L wastewater to 300 g / L wastewater;

[0042] In the step (1), the soaking and adsorption time is 6-9 hours;

[0043] In the step (4), the electrochemical treatment time is 4-9 hours.

[0044] Beneficial effects of the present invention:

[0045] A step-by-step, integrated treatment process has been proposed, achieving efficient, green, and low-cost treatment of organic pollutants in high-salinity wastewater. This process, which concentrates and transfers organic pollutants from high-salinity wastewater, achieves an excellent 82% degradation of COD organic pollutants in wastewater, even in extreme wastewater conditions with a conductivity of 39,492 μs / cm, a pH of 11 or higher, and a COD of 20,000 or higher. It also effectively avoids the production of chlorine gas as a side reaction, expanding the application and scope of electrochemical wastewater treatment.

[0046] At the same time, the modified activated carbon can improve its own adsorption and electrochemical regeneration efficiency, realize the repeated recycling of adsorbent adsorption-desorption, and greatly reduce the investment in treatment costs.

[0047] The electrochemical catalytic adsorption regeneration method proposed in the present invention innovatively integrates the desorption and regeneration of activated carbon adsorbents with the degradation of organic matter. The proposed high-salt wastewater treatment process can not only achieve low-cost and efficient removal of organic matter in high-salt wastewater, but also provide a theoretical basis for the treatment of high-salt organic wastewater, and provide applicable new technologies for energy-saving and efficient wastewater treatment (including lithium battery brine, etc.). BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 This is a schematic diagram of the step-by-step integrated process of the present invention.

[0049] Figure 2 The adsorption and regeneration effect diagram of activated carbon adsorbent. Among them, (a) is the UV of wastewater during the adsorption test of two activated carbon adsorbents. 254 The horizontal axis is the treatment time (h), and the vertical axis is the absorbance (Abs); (b) is the full spectrum scanning result of the wastewater after 12 hours of adsorption by two activated carbon adsorbents, the horizontal axis is the scanning wavelength (nm), and the vertical axis is the absorbance (Abs); (c) is the UV of the desorption liquid before and after the regeneration of the modified activated carbon 254 The horizontal axis represents different regeneration stages, and the vertical axis represents absorbance (Abs).

[0050] Figure 3 The results of the step-by-step integrated process for treating lithium-ion battery brine are shown in Figure 1. (a) shows the COD of the wastewater after five cycles, with the horizontal axis representing the treatment stage and the vertical axis representing the COD value. (b) shows the full spectrum scan of the wastewater after five cycles, with the horizontal axis representing the treatment time (h) and the vertical axis representing the absorbance (Abs).

[0051] In the figure: 1 sluice gate; 2 adsorption tank water inlet pipe; 3 activated carbon adsorbent; 4 adsorption tank; 5 adsorption tank outlet pipe; 6 air pump; 7 aeration head; 8 activated carbon desorbent; 9 conductive cathode electrode; 10 water permeable hole; 11 cathode chamber; 12 DC power supply; 13 conductive anode electrode; 14 desorption tank. DETAILED DESCRIPTION

[0052] The technical aspects of the present invention are further illustrated below with reference to the embodiments, which are not intended to limit the scope of protection of the present invention.

[0053] Example

[0054] Distributed integrated process design: As shown in Figure 1, a system for electrochemically catalytically modified activated carbon adsorbent regeneration and simultaneous treatment of high-salinity wastewater includes an adsorption tank 4 and an apparatus for electrochemically catalytically degrading organic pollutants and regenerating activated carbon. The adsorption tank 4 is used to hold high-salinity wastewater, where activated carbon adsorbent 3 adsorbs organic matter from the high-salinity wastewater, achieving high-salinity wastewater treatment. After adsorbing organic matter in the adsorption tank 4, the activated carbon adsorbent 3 then serves as an activated carbon desorbent 8 in the apparatus for electrochemically catalytically degrading organic pollutants and regenerating activated carbon, achieving electrochemical catalytic adsorption regeneration of the modified activated carbon adsorbent. Wastewater enters the adsorption tank 4 through the adsorption tank inlet pipe 2 and a sluice gate 1. After treatment to meet discharge standards, the wastewater is discharged through the adsorption tank outlet pipe 5, which is equipped with a sluice gate.

[0055] The device for electrochemically catalytically degrading organic pollutants and regenerating activated carbon is divided into two reaction chambers, one large and one small. The smaller reaction chamber is contained within the larger reaction chamber, which is five times the size of the smaller one. The larger reaction chamber is a desorption cell 14, which carries the desorption liquid and regenerates the activated carbon. The smaller reaction chamber is the cathode chamber 11, which has a porous, water-permeable structure. The diameter of the water-permeable pores 10 (0.5 mm) is smaller than the particle size of the activated carbon desorbent 8, ensuring that the desorption liquid fully penetrates the activated carbon desorbent 8 and preventing its escape. The activated carbon desorbent 8 is tightly packed in the cathode chamber 11 (to ensure smooth electron transfer and stable current flow). One end of a conductive cathode electrode 9 is inserted into the cathode chamber, and the other end is connected to the negative terminal of a DC power supply 12. The DC power supply voltage is set to 0.4 V. An air pump 6, via an aeration head 7, aerates the bottom of the cathode chamber 11, providing sufficient oxygen for the electrochemical catalytic degradation process and stirring the desorption liquid near the activated carbon desorbent 8 to promote the desorption and regeneration of the activated carbon. One end of the conductive anode electrode 13 is led out from the positive pole of the DC power supply 12, and the other end is inserted into the desorption liquid of the desorption cell 14, away from one end of the cathode chamber 11. The anode and cathode electrodes are both carbon rods, and are treated with waterproof tape for waterproof insulation and anti-electricity. The desorption liquid is a 1.0 mol / L Na2SO4 solution, and the amount used is 20 mL / g adsorbent.

[0056] Preparation of activated carbon adsorbent:

[0057] Preparation of washed activated carbon adsorbent (AC): A sufficient amount of granular activated carbon with a diameter of 1.2-1.5 mm was ultrasonically washed until no carbon dust was removed. The washed activated carbon was then soaked in 75% denatured alcohol for 10 hours to remove surface organic matter. After soaking, the activated carbon was drained. Residual alcohol was then rinsed with deionized water and dried overnight at 70°C. The resulting product was designated AC.

[0058] Preparation of Cobalt- and Cerium-doped Activated Carbon Adsorbent (CoCe / AC): 0.596g of Co(NO3)2 and 2.92g of Ce(NO3)2 were weighed and dissolved in 100mL of deionized water. Melamine was added and stirred to form a homogenous solution, ensuring a melamine concentration of 2 wt%. 70g of the AC prepared above was mixed with the solution using an equal volume immersion method and ultrasonicated for 30 minutes. The mixture was then dried in a 70°C forced air drying oven for 12 hours. The resulting dried particles were placed in a muffle furnace and heated to 400°C at a heating rate of 5°C / min. Annealing was performed for 2 hours. The final product was designated CoCe / AC.

[0059] Adsorbent adsorption and electrochemical catalytic regeneration:

[0060] The step-by-step integrated process is used to degrade organic pollutants in high-salinity wastewater using the prepared water-washed activated carbon adsorbent (AC) and cobalt- and cerium-doped activated carbon adsorbent (CoCe / AC). The specific steps are as follows:

[0061] (1) Measure 12 g of two different activated carbon adsorbents, two portions each, fill them in a flexible filter, and divide them into two groups. One group of AC adsorbent and CoCe / AC adsorbent are completely immersed in an adsorption tank containing 100 mL of high-salt wastewater for 6 hours. Then take out the activated carbon and replace it with another group of the same activated carbon adsorbent for adsorption, and the adsorption time is also 6 hours. The replaced activated carbon adsorbent is transferred to the desorption tank for desorption regeneration. Repeat the exchange adsorption regeneration process five times. Before each replacement, sample each group of wastewater and perform UV 254 Test and observe the adsorption of organic pollutants by activated carbon adsorbents, such as Figure 2 (a) in the figure; take the water sample after 12 hours of adsorption and conduct full spectrum scanning test, such as Figure 2 (b) After five adsorption cycles, the UV 254 A decrease of 56.63% and 90.26% respectively.

[0062] (2) After soaking and adsorbing for 6 hours, the activated carbon adsorbent is taken out and drained, and then transferred to the desorption tank for desorption regeneration. Turn on the DC power supply, adjust the voltage to 0.4V, connect the electrochemical reaction device, and ensure the stability of the electrochemical treatment process. The activated carbon desorption regeneration treatment time is 6 hours. The desorption treatment liquid before and after each regeneration is sampled, and the collected water samples are UV-tested. 254 Test, a total of five regeneration processes, the results are as follows Figure 2 Middle (c).

[0063] Lithium battery high-salt wastewater treatment:

[0064] The described step-by-step integrated process was used to treat high-salinity wastewater from Huayi Lithium Battery. 20 g of the prepared CoCe / AC adsorbent was loaded onto a flexible filter and immersed in 200 mL of high-salinity wastewater for 8 hours of adsorption. After adsorption was complete, the CoCe / AC adsorbent was removed from the wastewater and drained to obtain adsorption-saturated activated carbon. Simultaneously, another 20 g of the same CoCe / AC adsorbent was immersed in high-salinity wastewater for the next 8 hours of adsorption.

[0065] The saturated activated carbon adsorbent was added to the desorption reaction device for desorption regeneration. The DC power supply and air pump were turned on, the voltage was set to 0.4 V, and the reaction time was set to 8 h.

[0066] After adsorption and desorption are complete, the CoCe / AC adsorbent in the adsorption tank is removed and exchanged with the CoCe / AC adsorbent in the desorption tank. The adsorption-saturated activated carbon undergoes desorption and regeneration, and the regenerated activated carbon is returned to the adsorption tank to adsorb the wastewater. The activated carbon is drained after each exchange, and the adsorption and desorption process is repeated until the organic matter content in the adsorption tank meets the treatment requirements. The treated wastewater is discharged through the adsorption tank outlet pipe 5 and fresh wastewater is injected into the adsorption tank inlet pipe 2, allowing the next batch of wastewater to be treated.

[0067] During the treatment process, at the end of each adsorption stage, water samples of the treated lithium-ion brine were collected for UV254 and COD determination. Figure 3 (a) in the figure, and perform full spectrum scanning test at the same time, such as Figure 3 In this embodiment, the adsorption and desorption treatment was repeated five times, and the COD index of the wastewater in the adsorption tank reached a removal effect of 81.68%.

[0068] The above examples demonstrate that the CeCe / AC adsorbent used in the present invention exhibits superior adsorption performance compared to water-washed activated carbon adsorbents. The examples also demonstrate that the treatment of high-salinity wastewater from lithium batteries demonstrates that the step-by-step integrated treatment process proposed in this invention efficiently adsorbs organic matter from high-salinity wastewater using the CoCe / AC adsorbent. Desorption and electrochemical treatment of the desorbed liquid allow for efficient treatment of organic matter in high-salinity wastewater while simultaneously regenerating and reusing the activated carbon adsorbent. The effective treatment of high-salinity wastewater from lithium batteries demonstrated the feasibility of this invention in the treatment of actual lithium battery industrial wastewater.

Claims

1. An electrochemical catalytic modified activated carbon adsorbent regeneration and high-salt wastewater simultaneous treatment system, characterized in that: The invention comprises an adsorption tank (4) and an apparatus for electrochemically catalytically degrading organic pollutants and regenerating activated carbon: The adsorption tank (4) is used to store high-salt wastewater, and the activated carbon adsorbent (3) adsorbs organic matter in the high-salt wastewater to achieve high-salt wastewater treatment; After the activated carbon adsorbent (3) adsorbs organic matter in high-salt wastewater in the adsorption tank (4), it is then used as an activated carbon desorbent (8) for a device that electrochemically catalytically degrades organic pollutants and regenerates activated carbon, thereby achieving electrochemical catalytic adsorption regeneration of the activated carbon adsorbent; The preparation method of activated carbon adsorbent (3) is as follows: a sufficient amount of granular activated carbon is ultrasonically washed with water until no carbon powder falls off, the washed activated carbon is immersed in an ethanol solution to remove organic matter adhering to the surface, drained, washed with water until neutral, and then dried overnight to obtain washed activated carbon, named AC; then Co(NO3)2 and Ce(NO3)2 are added to deionized water, and then melamine is added and stirred to obtain a homogeneous solution; a certain amount of the above-mentioned washed activated carbon is mixed with the homogeneous solution by an equal volume immersion method and ultrasonically treated, and then dried in a blast drying oven overnight to obtain dry particles, which are calcined in a muffle furnace to obtain a carbonaceous material with excellent catalytic activity, named CoCe / AC.

2. The electrochemical catalytic modified activated carbon adsorbent regeneration and high-salt wastewater simultaneous treatment system according to claim 1 is characterized in that: The device for electrochemically catalytically degrading organic pollutants and regenerating activated carbon is divided into two reaction chambers, the small reaction chamber is contained in the large reaction chamber; the large reaction chamber is a desorption tank (14), which is used to carry the desorption liquid and regenerate the activated carbon; the small reaction chamber is a cathode chamber (11), which is a porous water-permeable structure, and the pore size of the water-permeable pores (10) is smaller than the particle size of the activated carbon desorbent (8), ensuring that the desorption liquid fully infiltrates the activated carbon desorbent (8) inside and prevents it from escaping; the activated carbon desorbent (8) is tightly filled in the cathode chamber (11). , one end of a conductive cathode electrode (9) is inserted inside, and the other end of the conductive cathode electrode (9) is connected to the negative electrode of a DC power supply (12); an air pump (6) aerates the bottom of the cathode chamber (11) through an aeration head (7), providing sufficient oxygen for the electrochemical catalytic degradation process, and stirring the desorption liquid near the activated carbon desorbent (8) to promote the desorption and regeneration process of the activated carbon; one end of the conductive anode electrode (13) is led out from the positive electrode of the DC power supply (12), and the other end is inserted into the desorption liquid of the desorption tank (14), away from one end of the cathode chamber (11).

3. The electrochemical catalytic modified activated carbon adsorbent regeneration and high-salt wastewater simultaneous treatment system according to claim 1 is characterized in that: The size of the desorption cell (14) is 3-10 times the size of the cathode chamber (11); the DC power supply voltage is set to 0.3-1.0V; the conductive cathode electrode (9) and the conductive anode electrode (13) are carbon rods or carbon fiber cloth conductive materials; the conductive cathode electrode (9) and the conductive anode electrode (13) are waterproof, insulated and anti-electrical except for the parts in contact with the activated carbon and the desorption liquid, so as to improve the electron transmission efficiency.

4. The electrochemical catalytic modified activated carbon adsorbent regeneration and high-salt wastewater simultaneous treatment system according to claim 1 is characterized in that: The desorption liquid is an electrolyte solution of 0.5-1.5 mol / L Na2SO4 or K2SO4; the dosage of the desorption liquid is 10-30 mL / g activated carbon desorbent.

5. A method for regenerating an electrochemically catalytically modified activated carbon adsorbent and simultaneously treating high-salt wastewater is performed using the electrochemically catalytically modified activated carbon adsorbent regeneration and high-salt wastewater simultaneous treatment system according to any one of claims 1 to 4, characterized in that: First, a permeable container filled with activated carbon adsorbent is placed in the adsorption tank wastewater for adsorption. After the adsorption is completed, the saturated activated carbon is taken out and drained, and new activated carbon is used for adsorption again. At the same time, the adsorbed activated carbon is placed in the desorption tank for electrochemical treatment to degrade the desorbed organic pollutants and regenerate the activated carbon. After adsorption and desorption are completed, the two pools of activated carbon are exchanged. The activated carbon after adsorption is sent to the desorption pool for regeneration, and the regenerated activated carbon is returned to the adsorption pool for re-adsorption. Each exchange requires draining, and the operation is repeated until the wastewater meets the standards.

6. The method for regenerating an electrochemically catalytically modified activated carbon adsorbent and simultaneously treating high-salt wastewater according to claim 5, characterized in that: The specific steps are as follows: 1) Using a permeable container filled with activated carbon adsorbent (3), immersing it in high-salt wastewater for adsorption; 2) After step 1) is completed, the activated carbon adsorbent (3) is removed from the adsorbed high-salt wastewater and drained; 3) Take another permeable container consistent with step 1) and fill it with new activated carbon adsorbent (3) and immerse it in high-salt wastewater for adsorption, and repeat step 1); 4) using an electrochemical catalytic degradation device for organic pollutants and activated carbon regeneration to treat the desorption liquid and simultaneously regenerate the activated carbon adsorbent; the activated carbon adsorbent (3) adsorbed in step 2) is filled into the cathode chamber (11) as an activated carbon desorbent (8) so that it is decomposed and regenerated there; and simultaneously, the decomposed organic matter is degraded and removed; 5) After step 4) is completed, the activated carbon desorbent (8) is taken out from the desorption liquid and drained to obtain the regenerated activated carbon adsorbent (3), which is then exchanged with the activated carbon adsorbent (3) soaked in the wastewater in step 3) to perform the adsorption process again; 6) After step 3) is completed, the activated carbon adsorbent (3) after adsorption is taken out from the wastewater, drained, and added to the device for electrochemical catalytic degradation of organic pollutants and regeneration of activated carbon as described in step 4) for desorption and regeneration; 7) Repeat steps 5) and 6) in a cycle to regenerate the activated carbon adsorbent until the COD of the wastewater in the system meets the requirements for desalination treatment.

7. The method for regenerating an electrochemically catalytically modified activated carbon adsorbent and simultaneously treating high-salt wastewater according to claim 6, characterized in that: In the step 1), the water-permeable container is a flexible filter screen or a porous rigid container, and the pore size d is ≤ 1 mm; In the step 1), the activated carbon adsorbent is cobalt- and cerium-doped activated carbon; the amount of the activated carbon adsorbent used is 100 g / L to 300 g / L of wastewater; and the soaking and adsorption time is 6-9 hours.

8. The method for regenerating an electrochemically catalytically modified activated carbon adsorbent and simultaneously treating high-salt wastewater according to claim 6, characterized in that: In the step 4), the electrochemical treatment time is 4-9 hours.

9. The method for regenerating an electrochemically catalytically modified activated carbon adsorbent and simultaneously treating high-salt wastewater according to claim 1, characterized in that: The diameter of the granular activated carbon is d=0.5~2.0mm; the ethanol solution is alcohol or industrial alcohol with a volume fraction of 65~95%; the activated carbon is immersed in the ethanol solution for 10h~12h; the total mass fraction of metal salts in the homogeneous solution is 2.5~5.0wt%; the amount of Co(NO3)2 is 0.5%~1% of the mass of the activated carbon washed with water; the amount of Ce(NO3)2 is 1%~5% of the mass of the activated carbon washed with water; the mass fraction of melamine in the homogeneous solution is 1.5~2.5wt%; the time for ultrasonic treatment of the activated carbon and the homogeneous solution is 20~30min; the drying temperature is 70~85℃, and the drying time is 12~16h; the muffle furnace calcination temperature is 400℃~500℃; the muffle furnace calcination heating rate is set to 4.8~5.2℃ / min; the muffle furnace annealing temperature calcination treatment time is 2~4h.

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