Electrochemical catalysis modified activated carbon adsorbent regeneration and high-salinity wastewater synchronous treatment system and method

Abstract

The invention provides a system and a method for regenerating an electrochemical catalysis modified activated carbon adsorbent and synchronously treating high-salinity wastewater, aiming at solving the problem of high-salinity high-alkali organic wastewater treatment. The process integrates the steps of activated carbon adsorption and electrochemical regeneration, the modified activated carbon can be used as an adsorbent and can also be used as a catalyst, and the process of catalytic adsorption and desorption regeneration cycle is utilized, so that the sewage and wastewater treatment cost is greatly reduced, and the problem that organic pollutants are difficult to electrochemically degrade under high-salt and strong-alkali conditions is solved; and toxic and harmful side reactions are easily generated. The treated industrial wastewater comes from high-salinity wastewater generated in the lithium battery production process, and low-cost, green and efficient organic pollutant degradation treatment of the high-salinity wastewater is realized by using the process.

Description

Technical Field

[0001] The present invention relates to the field of high-salt and high-alkali organic wastewater treatment, and relates to a system and method for electrochemical catalytic modified activated carbon adsorbent regeneration and high-salt wastewater synchronous treatment. The process water treatment volume is small, the regeneration time is short, the energy consumption cost is low, the activated carbon desorption and organic matter degradation can be achieved in one step, and the water treatment effect is remarkable. Background Art

[0002] High-salt and high-alkali organic wastewater not only contains high concentrations of Na + , Ca 2+ , K + , Cl - , SO4 2- There are many soluble inorganic ion salts, as well as other types of organic pollutants, with complex compositions and compound pollution characteristics. In order to reduce the difficulty of subsequent recovery of inorganic salt components in wastewater, it is often necessary to degrade or remove organic components in wastewater in advance. High salt and strong alkaline conditions make conventional biological treatment and physical and chemical treatment methods ineffective or costly.

[0003] Due to its rich pore structure and surface functional groups, huge specific surface area, and excellent chemical and physical adsorption properties, activated carbon can effectively reduce various indicators in various types of wastewater under the premise of temperature and influent water quality fluctuations, especially in the deep removal of organic pollutants. Compared with other technologies, activated carbon adsorption technology is the most economical, low-energy, pollution-free green water treatment technology with low investment and quick results. As a new type of activated carbon regeneration technology, electrochemical regeneration is simple to operate, has high regeneration efficiency, large operating space, and good 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 react with hydroxyl radicals, superoxide radicals and other groups generated at the cathode and are degraded, and finally converted into carbon dioxide, water and some inorganic ions. The electrochemical solution effectively overcomes the shortcomings of traditional methods with its advantages of cleanliness, high efficiency and strong controllability.

[0004] The present invention designs a water treatment process which is simple to operate and effective in treatment, integrating modified activated carbon adsorption and electrochemical treatment. Firstly, modified activated carbon is used to adsorb organic pollutants in high-salt and high-alkali wastewater. After the adsorbed activated carbon is drained, it is transferred into an electrochemical system for desorption and regeneration, and the degradation of organic pollutants is completed. The problems of long treatment time and high treatment cost of high-salt and high-alkali wastewater and possible harmful side reactions caused by direct electrochemical treatment are solved, and the effects of removing organic matter from wastewater and recycling energy are achieved. Summary of the invention

[0005] In view of the above-mentioned problem that the existing treatment process cannot achieve the degradation of organic matter in high-salt wastewater, the present invention aims to provide a system and method for regenerating electrochemical catalytic modified activated carbon adsorbent and simultaneously treating high-salt wastewater. The process integrates two steps of activated carbon adsorption and activated carbon electrochemical regeneration. The process of treating organic matter in brine in this step-by-step integrated manner solves the problem of difficulty in removing organic pollutants in high-salt wastewater. The process uses 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 the high-salt environment, completes the degradation of organic matter in the brine and achieves the regeneration of activated carbon. The present invention is a feasible method for degrading organic matter in high-salt wastewater with simple operation and low 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 contain high-salinity wastewater, and the activated carbon adsorbent 3 adsorbs organic matter in the high-salinity wastewater to achieve high-salinity wastewater treatment;

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

[0010] The device for electrochemical catalytic degradation of organic pollutants and regeneration of activated carbon is divided into two reaction chambers of different sizes, and 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 the cathode chamber 11, which is a porous water-permeable structure, and the aperture of the water-permeable hole 10 is smaller than the particle size of the activated carbon desorbent 8, so as to ensure that the desorption liquid fully infiltrates the activated carbon desorbent 8 inside and prevent it from escaping. The activated carbon desorbent 8 is tightly filled in the cathode chamber 11 (to ensure the smooth electron transfer process and the stability of the current), and one end of the conductive cathode electrode 9 is inserted inside, and the other end of the conductive cathode electrode 9 is connected to the negative pole of the DC power supply 12. The air pump 6 aerates the bottom of the cathode chamber 11 through the aeration head 7, provides sufficient oxygen for the electrochemical catalytic degradation process, and stirs 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] Further, the size of the desorption cell 14 is 3-10 times the size of the cathode chamber 11;

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

[0013] Further, 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 are all treated with waterproof, insulating and anti-electrical treatment except for the part in contact with the activated carbon and the desorption liquid to improve the electron transmission efficiency, for example, by wrapping and covering the conductive material with waterproof tape;

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

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

[0017] A method for regenerating an electrochemical catalytic modified activated carbon adsorbent and simultaneously treating high-salt wastewater, first, a permeable container containing an activated carbon adsorbent is placed in the wastewater of an adsorption tank for adsorption, and after the adsorption is completed, the saturated activated carbon is taken out and drained, and new activated carbon is taken for adsorption again, and at the same time, 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 the adsorption and desorption are completed, the two pools of activated carbon are exchanged, the adsorbed activated carbon is regenerated in the desorption tank, and the regenerated activated carbon is returned to the adsorption tank for adsorption again, and each exchange needs to be drained, and the operation is repeated until the wastewater meets the standards.

[0018] The specific steps are as follows:

[0019] (1) using a permeable container to fill the 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 high-salt wastewater after adsorption and drained;

[0021] (3) taking another permeable container consistent with step (1), filling it with new activated carbon adsorbent 3 and immersing it in high-salt wastewater for adsorption, and repeating step (1);

[0022] (4) Using an electrochemical catalytic degradation device for organic pollutants and activated carbon regeneration to treat the desorption liquid and 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, drained to obtain the regenerated activated carbon adsorbent 3, and then replaced with the activated carbon adsorbent 3 immersed 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 taken out 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 realize 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 the step (1), the activated carbon adsorbent is cobalt- or cerium-doped activated carbon (CoCe / AC) or other preferred activated carbon adsorbents. Further, 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, and the washed activated carbon was soaked in an ethanol solution to remove organic matter adhering to the surface, drained, washed with water until neutral, and dried overnight to obtain washed activated carbon, named AC. Then Co(NO3)2 and Ce(NO3)2 were added to deionized water, followed by melamine and stirred to obtain a homogeneous solution. A certain amount of the above-mentioned washed activated carbon was mixed with the homogeneous solution by an equal volume soaking method and ultrasonically treated, and then dried in a blast drying oven overnight to obtain dry particles, which were calcined in a muffle furnace to obtain a carbonaceous material with excellent catalytic activity, named CoCe / AC.

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

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

[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 is 0.5% to 1% of the mass of the activated carbon washed with water;

[0034] Furthermore, the amount of Ce(NO3)2 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 1.5-2.5wt%;

[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 12-16h;

[0038] Furthermore, the muffle furnace calcination temperature 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 annealing temperature and calcination time of the muffle furnace is 2 to 4 hours;

[0041] In the step (1), the amount of activated carbon adsorbent used is 100 g / L to 300 g / L of 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 is proposed to achieve efficient, green and low-cost treatment of organic pollutants in high-salinity wastewater. The treatment process proposed by the present invention realizes the concentrated transfer treatment of organic pollutants in high-salinity wastewater. Even in the face of extreme wastewater conditions with conductivity = 39492μs / cm, pH ≥ 11, and COD ≥ 20000, the present invention still achieves an excellent effect of 82% degradation of COD organic pollutants in wastewater, and effectively avoids the production of chlorine gas by side reaction, expanding the application mode 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 of treatment costs.

[0047] The electrochemical catalytic adsorption and 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 It 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 (a) is the full spectrum scanning result of wastewater after 12 hours of adsorption by two activated carbon adsorbents, with the horizontal axis being the scanning wavelength (nm) and the vertical axis being the absorbance (Abs); (c) is the UV spectrum of the desorption liquid before and after the regeneration of modified activated carbon. 254 The horizontal axis represents different regeneration stages, and the vertical axis represents absorbance (Abs).

[0050] Figure 3 The effect diagram of using the step-by-step integrated process to treat lithium-ion brine. (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 result 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 described below in conjunction with embodiments, which are not intended to limit the protection scope of the present invention.

[0053] Example

[0054] Distributed integrated process design: Figure 1As shown, a system for regenerating an electrochemically catalytically modified activated carbon adsorbent and simultaneously treating high-salt wastewater includes an adsorption tank 4 and a device for electrochemically catalytically degrading organic pollutants and regenerating activated carbon. The adsorption tank 4 is used to hold 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 the high-salt wastewater in the adsorption tank 4, it is used as an activated carbon desorbent 8 of the device for electrochemically catalytically degrading organic pollutants and regenerating activated carbon to achieve electrochemical catalytic adsorption regeneration of the modified activated carbon adsorbent. Wastewater enters the adsorption tank 4 through the water gate 1 from the water inlet pipe 2, and after the wastewater is treated to meet the discharge standard, it is discharged from the water outlet pipe 7 with a water gate.

[0055] The device for electrochemical catalytic degradation of organic pollutants and regeneration of activated carbon is divided into two reaction chambers of different sizes, the small reaction chamber is contained in the large reaction chamber, and the size of the large reaction tank is 5 times that of the small reaction tank. 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 permeable structure, and the aperture (0.5mm) of the permeable hole 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 (to ensure smooth electron transfer and stable current), and one end of the conductive cathode electrode 9 is inserted inside, and the other end of the conductive cathode electrode 9 is connected to the negative pole of the DC power supply 12. The DC power supply voltage is set to 0.4V. The air pump 6 aerates the bottom of the cathode chamber 11 through the aeration head 7 to provide sufficient oxygen for the electrochemical catalytic degradation process, and stirs 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 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 waterproof tape is used for waterproof, insulating and anti-electric treatment. 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 water-washed activated carbon adsorbent (AC): Take enough granular activated carbon with a diameter of 1.2-1.5mm, and wash it with ultrasonic water until no carbon powder falls off. Then soak the washed activated carbon in 75% industrial alcohol by volume for 10 hours to remove surface organic matter, and drain it after soaking. Rinse the residual alcohol with deionized water, and finally dry it at 70℃ for one night. The obtained product is named AC.

[0058] Preparation of cobalt and cerium doped activated carbon adsorbent (CoCe / AC): Weigh 0.596g Co(NO3)2 and 2.92g Ce(NO3)2, dissolve in 100mL deionized water, add melamine and stir to form a homogeneous solution, ensuring that the mass fraction of melamine is 2wt%. Take 70g of the AC prepared above, mix it with the solution by equal volume immersion method, and ultrasonically treat it for 30min. Then place the mixture in a 70℃ forced drying oven for 12h, put the obtained dry particles into a muffle furnace, heat to 400℃ at a heating rate of 5℃ / min, anneal for 2h, and the final product is named 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 12g 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 100mL 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 and regeneration treatment. Repeat the exchange adsorption and regeneration treatment 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 adsorptions, the UV 254 A decrease of 56.63% and 90.26% respectively.

[0062] (2) After each 6-hour soaking and adsorption, the activated carbon adsorbent is taken out and drained, and then transferred to the desorption tank for desorption and regeneration. Turn on the DC power supply, adjust the voltage to 0.4V, connect the electrochemical reaction device, and ensure that the electrochemical treatment process is stable. The activated carbon desorption and regeneration treatment time is 6 hours. Samples of the desorption treatment liquid before and after each regeneration are taken, and the collected water samples are subjected to UV 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 step-by-step integrated process was used to treat the high-salt wastewater from Huayi Lithium Battery. 20g of the prepared CoCe / AC adsorbent was taken, and the CoCe / AC adsorbent was filled with a flexible filter and immersed in 200mL of high-salt wastewater for 8 hours of adsorption. After the adsorption was completed, the CoCe / AC adsorbent was removed from the wastewater and drained to obtain adsorption saturated activated carbon. At the same time, another group of the same 20g CoCe / AC adsorbent was immersed in high-salt wastewater for the next 8h adsorption.

[0065] The adsorbent saturated with activated carbon 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 8 h.

[0066] After adsorption and desorption are completed, the CoCe / AC adsorbent in the adsorption tank is taken out and exchanged with the CoCe / AC adsorbent in the desorption tank. The adsorption-saturated activated carbon is desorbed and regenerated. The regenerated activated carbon is added back to the adsorption tank to adsorb the wastewater. The activated carbon needs to be drained each time it is exchanged, and the adsorption and desorption process is repeated until the organic matter in the wastewater in the adsorption tank meets the treatment requirements. The treated wastewater is discharged through the adsorption tank outlet pipe 5, and new wastewater is injected into the adsorption tank inlet pipe 2, and then the next batch of wastewater is 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 show that the CeCe / AC adsorbent used in the present invention exhibits an adsorption effect superior to that of the water-washed activated carbon adsorbent; the example of lithium battery high-salinity wastewater treatment shows that the step-by-step integrated treatment process proposed in the present invention is used to efficiently adsorb organic matter in high-salinity wastewater through the CoCe / AC adsorbent, and the desorption liquid is treated by desorption treatment and electrochemical treatment, which can complete the regeneration and reuse of the activated carbon adsorbent while achieving efficient treatment of organic matter in high-salinity wastewater. The effective treatment of lithium battery high-salinity wastewater in the example proves the feasibility of the present invention in actual lithium battery industrial wastewater treatment.

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 a device for electrochemically catalytically degrading organic pollutants and regenerating activated carbon. The adsorption tank (4) is used to store high-salinity wastewater, and the activated carbon adsorbent (3) adsorbs organic matter in the high-salinity wastewater to achieve high-salinity wastewater treatment; After the activated carbon adsorbent (3) adsorbs organic matter in high-salt wastewater in the adsorption tank (4), it is used as an activated carbon desorbent (8) in a device for electrochemically catalytically degrading organic pollutants and regenerating activated carbon, thereby realizing electrochemical catalytic adsorption regeneration of the modified activated carbon adsorbent.

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, large and small, wherein the small reaction chamber is contained in the large reaction chamber; the large reaction chamber is a desorption tank (14) for carrying a desorption liquid and regenerating the activated carbon; the small reaction chamber is a cathode chamber (11), which is a porous water-permeable structure, wherein the diameter of the water-permeable pores (10) is smaller than the particle diameter of the activated carbon desorbent (8), thereby 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 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) to provide sufficient oxygen for the electrochemical catalytic degradation process, and stirs the desorption liquid near the activated carbon desorbent (8) to promote the activated carbon desorption 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 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 conductive materials such as carbon rods or carbon fiber cloth; the conductive cathode electrode (9) and the conductive anode electrode (13), except for the part in contact with the activated carbon and the desorption liquid, are treated with waterproofing, insulation and anti-electricity treatment to improve the electron transmission efficiency, for example, by wrapping and covering the conductive material with waterproof tape.

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 carried out by using a system for regenerating an electrochemically catalytically modified activated carbon adsorbent and simultaneously treating high-salt wastewater as described in any one of claims 1 to 4, characterized in that: First, a permeable container containing activated carbon adsorbent is placed in the wastewater of the adsorption tank for adsorption. After the adsorption is completed, the saturated activated carbon is taken out and drained, and new activated carbon is taken for adsorption again. At the same time, the activated carbon after adsorption 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 returns to the adsorption pool for adsorption again. Each exchange needs to be drained, 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 water-permeable container to load an activated carbon adsorbent (3), immersing the container in high-salt wastewater for adsorption; 2) After step 1) is completed, the activated carbon adsorbent (3) is taken out from the high-salt wastewater after adsorption 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 a device for electrochemically catalytically degrading organic pollutants and regenerating activated carbon to treat the desorption liquid and simultaneously regenerate the activated carbon adsorbent; filling the activated carbon adsorbent (3) after adsorption in step 2) as an activated carbon desorbent (8) in the cathode chamber (11) so that it is decomposed and regenerated there; and at the same time, 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 described in step 4) for desorption and regeneration; 7) Repeat steps 5) and 6) in a cycle to realize the recycling and regeneration of 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- or cerium-doped activated carbon or other preferred activated carbon adsorbents; the amount of the activated carbon adsorbent is 100 g / L to 300 g / L of wastewater; and the soaking and adsorption time is 6-9 h.

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 6, characterized in that: 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, and 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 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.

10. The method for regenerating an electrochemically catalytically modified activated carbon adsorbent and simultaneously treating high-salt wastewater according to claim 9, 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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