Radioactive organic waste liquid treatment system and method of treating radioactive organic waste liquid

Abstract

This invention discloses a radioactive organic waste liquid treatment system and method. The system includes: an ultrasonic homogenizing reaction unit for enhancing mass transfer and reaction of the radioactive organic waste liquid; an electrocatalytic oxidation reaction unit connected to the ultrasonic homogenizing reaction unit for electrocatalytic oxidation of the material introduced therein; and a microwave catalytic reaction unit connected to the electrocatalytic oxidation reaction unit for microwave catalytic reaction of the material introduced therein. The method of this invention is an innovative radioactive organic waste liquid treatment technology that requires no external chemical reagents, generates a small amount of secondary radioactive solid waste, is suitable for intermittent operation, provides thorough treatment, and is economical and safe to operate. This invention integrates electrocatalytic oxidation, microwave catalysis and regeneration, and ultrasonic enhancement technologies to construct a highly efficient sequencing batch reactor (SBR) co-processing system.

Description

Technical Field

[0001] This invention belongs to the field of radioactive waste liquid treatment technology, specifically relating to a radioactive organic waste liquid treatment system and a method for treating radioactive organic waste liquid. Background Technology

[0002] The cleaning process at nuclear facilities in the nuclear industry generates large quantities of complex low-level organic waste liquid. This waste liquid typically contains organic components such as extractants (e.g., TBP / kerosene), scintillation fluid, cleaning solvents, and lubricating oils, and is contaminated with fission products or activated nuclides, making its safe disposal a challenge. Currently, vitrification solidification technology is the mainstream method for treating high-level organic waste liquid, while technologies for treating low-level organic waste liquid include solidification stabilization, incineration, advanced oxidation processes, and combined technologies. However, none of these methods are effective in treating low-level organic waste liquid. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to address the above-mentioned deficiencies in the prior art by providing a radioactive organic waste liquid treatment system and a method for treating radioactive organic waste liquid. This method has the advantages of no chemical addition, no radioactive solid waste, small footprint, simple operation, and good treatment effect.

[0004] The technical solution adopted to solve the technical problem of this invention is to provide a radioactive organic waste liquid treatment system, comprising: Ultrasonic homogenizing reaction unit is used to enhance mass transfer and reaction of radioactive organic waste liquid; An electrocatalytic oxidation reaction unit is connected to an ultrasonic homogenizing reaction unit. The electrocatalytic oxidation reaction unit is used to perform electrocatalytic oxidation reactions on the materials introduced into it. The microwave catalytic reaction unit is connected to the electrocatalytic oxidation reaction unit. The microwave catalytic reaction unit is used to perform microwave catalytic reactions on the materials introduced into it.

[0005] Preferably, the ultrasonic homogenizing reaction unit includes: an ultrasonic homogenizing reaction tank and an ultrasonic generator, the ultrasonic generator being mounted on the ultrasonic homogenizing reaction tank. The ultrasonic homogenizing reaction unit also includes: an immersion level gauge, an online COD monitor, and an online pH meter. The immersion level gauge is mounted on the ultrasonic homogenizing reaction tank and is used to detect the liquid level. The online COD monitor is connected to the ultrasonic homogenizing reaction tank and is used to detect COD. The online pH meter is mounted on the ultrasonic homogenizing reaction tank and is used to detect the pH value online.

[0006] Preferably, the electrocatalytic oxidation reaction unit includes: an electrocatalytic oxidation reactor, an electrocatalytic oxidation reactor power supply connected to the electrocatalytic oxidation reactor, and the electrocatalytic oxidation reactor is connected to an ultrasonic homogenization reaction unit and a microwave catalytic reaction unit, respectively.

[0007] Preferably, the radioactive organic waste liquid treatment system further includes: an online hydrogen alarm and a control unit. The online hydrogen alarm is installed on the exhaust pipe connected to the gas outlet of the ultrasonic homogenizing reaction unit. When the online hydrogen alarm detects that the hydrogen content in the exhaust pipe exceeds the preset hydrogen content, it issues an alarm and sends the hydrogen content to the control unit, which then controls the power supply of the electrocatalytic oxidation reactor to be turned off.

[0008] Preferably, the electrocatalytic oxidation reactor includes: a cathode, an anode, a membrane module, and a membrane shell. The membrane shell surrounds a reaction chamber, and the anode and cathode are arranged inside the reaction chamber. The membrane module is sandwiched between the cathode and anode. The membrane shell is made of 316L material and lined with an insulating coating. The anode is made of silicon-based modified boron-doped diamond material, and the cathode is made of pure titanium material. The distance between the cathode and anode plates is 1.5 to 5 mm.

[0009] Preferably, the radioactive organic waste liquid treatment system further includes: The heat exchanger has its inlet connected to the microwave catalytic reaction unit and its outlet connected to the ultrasonic homogenizing reaction unit. The heat exchanger is used to introduce a cold source to cool the liquid material discharged from the microwave catalytic reaction unit. The cooled liquid material then flows into the ultrasonic homogenizing reaction unit.

[0010] Preferably, the inlet of the heat exchanger is also connected to the electrocatalytic oxidation reaction unit, and the heat exchanger is also used to introduce a cold source to cool the liquid material discharged from the electrocatalytic oxidation reaction unit. The cooled liquid material then flows into the ultrasonic homogenizing reaction unit.

[0011] Preferably, the radioactive organic waste liquid treatment system further includes: a first pipeline, a first valve, a second pipeline, a second valve, a third pipeline, and a third valve. The electrocatalytic oxidation reaction unit and the microwave catalytic reaction unit are connected through a first pipeline, and a first valve is installed on the first pipeline. The electrocatalytic oxidation reaction unit is connected to the inlet of the heat exchanger via a second pipe. A second valve is installed on the second pipe. The second pipe is connected to the first pipe. The first valve is located downstream of the connection point between the second pipe and the first pipe. The microwave catalytic reaction unit is connected to the inlet of the heat exchanger via a third pipe, and a third valve is installed on the third pipe. By closing the first valve and the third valve and opening the second valve, the catalyst in the microwave catalytic reaction unit is regenerated.

[0012] Preferably, the microwave catalytic reaction unit includes: a microwave catalytic reactor and a catalyst disposed within the microwave catalytic reactor, the catalyst being used to catalyze the reaction of radioactive organic waste liquid.

[0013] Preferably, the catalyst is a Fe-Bi / AC modified microwave catalyst, and the catalyst preparation method includes the following steps: (1) Weigh out activated carbon, ferric nitrate and bismuth nitrate in a mass ratio of (6~8): (1~3): (0.5~1.5). Dissolve ferric nitrate and bismuth nitrate in 0.5~1.0M dilute nitric acid to impregnate and obtain an impregnation solution. Add activated carbon to the impregnation solution for impregnation and dry it to obtain impregnated and dried activated carbon. (2) Under an inert atmosphere, the impregnated and dried activated carbon is calcined at 500~600℃ for 2~4h to obtain Fe-Bi / AC modified microwave catalyst.

[0014] Preferably, the radioactive organic waste liquid treatment system further includes: The exhaust gas purifier is connected to the ultrasonic homogenizing reaction unit and the microwave catalytic reaction unit respectively. The exhaust gas purifier is used to purify the exhaust gas discharged into it.

[0015] Preferably, the radioactive organic waste liquid treatment system further includes: The condenser is connected to the outlet of the ultrasonic homogenizing reaction unit and also to the exhaust gas purifier. The condenser is used to condense the exhaust gas discharged from the ultrasonic homogenizing reaction unit. The condensed liquid flows back into the ultrasonic homogenizing reaction unit, and the unliquefied exhaust gas is discharged into the exhaust gas purifier.

[0016] Preferably, the radioactive organic waste liquid treatment system further includes: The security filter has its inlet connected to the ultrasonic homogenization reaction unit and its outlet connected to the electrocatalytic oxidation reaction unit. The security filter is used to filter the materials passing into it.

[0017] The present invention also provides a method for treating radioactive organic waste liquid using the above-described radioactive organic waste liquid treatment system, comprising the following steps: Radioactive organic waste liquid is passed into an ultrasonic homogenizing reaction unit to enhance the mass transfer and reaction of the radioactive organic waste liquid; Then, the material is introduced into the electrocatalytic oxidation reaction unit to undergo an electrocatalytic oxidation reaction. Then, the microwave catalytic reaction unit is introduced to carry out a microwave catalytic reaction on the material introduced into it.

[0018] Preferably, the ultrasonic frequency of the ultrasonic homogenizing reaction unit is 23~33KHz.

[0019] Preferably, the operating current density of the electrocatalytic oxidation reaction unit is 500–600 mA / m 2 The operating voltage is 0.1 to 36V.

[0020] Preferably, the microwave catalytic reaction unit operates under the following conditions: operating frequency 2.35~2.55GHz, power 0.5~5kW.

[0021] Preferably, the microwave catalytic reaction unit operates under the following conditions for microwave regeneration: operating frequency 2.35~2.55GHz; first operating stage: power 1~5kW, operating time 5~10min; second operating stage: power 3~10kW, operating time 15~30min.

[0022] This invention provides a radioactive organic waste liquid treatment system and a method for treating radioactive organic waste liquid. The method has the advantages of small footprint, simple operation, and good treatment effect. The chemical oxygen demand of the treated waste liquid can be reduced to less than 40 mg / L.

[0023] This invention presents an innovative treatment technology for radioactive organic waste liquid that requires no external chemical reagents, generates minimal secondary radioactive solid waste, is adaptable to intermittent operation, provides thorough treatment, and is economical and safe to operate. This invention integrates electrocatalytic oxidation, microwave catalysis and regeneration, and ultrasonic enhancement technologies to construct a highly efficient sequencing batch reactor (SBR) co-processing system. This system primarily utilizes in-situ generated strong oxidizing free radicals to thoroughly degrade organic matter and innovatively operates through a microwave catalytic reaction unit to achieve microwave oxidation of organic matter, fundamentally reducing the generation of radioactive solid waste and providing a completely new solution for the treatment of low-radioactive organic waste liquid. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the radioactive organic waste liquid treatment system in Embodiment 2 of the present invention.

[0025] In the diagram: 1-Online COD monitor; 2-Radioactive organic waste liquid inlet; 3-Online pH meter; 4-Submersible level gauge; 5-Ultrasonic generator; 6-Condenser; 7-Online hydrogen alarm; 8-Ultrasonic homogenizing reaction tank; 9-Circulating pump; 10-Fifth valve; 11-Security filter; 12-Power supply for electrocatalytic oxidation reactor; 13-Electrocatalytic oxidation reactor; 14-First valve; 15-Second valve; 16-Microwave catalytic reactor; 17-Sixth valve; 18-Catalyst; 19-Fourth valve; 20-Third valve; 21-Heat exchanger; 22-Waste gas purifier; 23-Negative pressure fan. Detailed Implementation

[0026] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0028] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0029] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0030] Example 1

[0031] This embodiment provides a radioactive organic waste liquid treatment system, including: Ultrasonic homogenizing reaction unit is used to enhance mass transfer and reaction of radioactive organic waste liquid; An electrocatalytic oxidation reaction unit is connected to an ultrasonic homogenizing reaction unit. The electrocatalytic oxidation reaction unit is used to perform electrocatalytic oxidation reactions on the materials introduced into it. The microwave catalytic reaction unit is connected to the electrocatalytic oxidation reaction unit. The microwave catalytic reaction unit is used to perform microwave catalytic reactions on the materials introduced into it.

[0032] This embodiment also provides a method for treating radioactive organic waste liquid using the above-described radioactive organic waste liquid treatment system, comprising the following steps: Radioactive organic waste liquid is passed into an ultrasonic homogenizing reaction unit to enhance the mass transfer and reaction of the radioactive organic waste liquid; Then, the material is introduced into the electrocatalytic oxidation reaction unit to undergo an electrocatalytic oxidation reaction. Then, the microwave catalytic reaction unit is introduced to carry out a microwave catalytic reaction on the material introduced into it.

[0033] This embodiment presents an innovative treatment technology for radioactive organic waste liquid that requires no external chemical reagents, generates minimal secondary radioactive solid waste, is adaptable to intermittent operation, and offers thorough treatment while being economical and safe to operate. This embodiment integrates electrocatalytic oxidation, microwave catalysis and regeneration, and ultrasonic enhancement technologies to construct a highly efficient sequencing batch reactor (SBR) co-processing system. This system primarily utilizes in-situ generated strong oxidizing free radicals to thoroughly degrade organic matter and innovatively operates through a microwave catalytic reaction unit to achieve microwave oxidation of organic matter, fundamentally reducing the generation of radioactive solid waste and providing a novel solution for the treatment of low-radioactive organic waste liquid.

[0034] Example 2

[0035] like Figure 1 As shown, this embodiment provides a radioactive organic waste liquid treatment system, including: Ultrasonic homogenizing reaction unit is used to enhance mass transfer and reaction of radioactive organic waste liquid; An electrocatalytic oxidation reaction unit is connected to an ultrasonic homogenizing reaction unit. The electrocatalytic oxidation reaction unit is used to perform electrocatalytic oxidation reactions on the materials introduced into it. The microwave catalytic reaction unit is connected to the electrocatalytic oxidation reaction unit. The microwave catalytic reaction unit is used to perform microwave catalytic reactions on the materials introduced into it.

[0036] The radioactive organic waste liquid treatment system in this embodiment enables automated sequential batch processing of each unit.

[0037] Preferably, the ultrasonic homogenization reaction unit includes: an ultrasonic homogenization reaction tank 8 and an ultrasonic generator 5, with the ultrasonic generator 5 mounted on the ultrasonic homogenization reaction tank 8. The ultrasonic homogenization reaction unit also includes: an immersion level gauge 4, an online COD monitor 1, and an online pH meter 3. The immersion level gauge 4 is mounted on the ultrasonic homogenization reaction tank 8 and is used to detect the liquid level. The online COD monitor 1 is connected to the ultrasonic homogenization reaction tank 8 and is used to detect COD. The online pH meter 3 is mounted on the ultrasonic homogenization reaction tank 8 and is used to detect the pH value online. COD refers to the chemical oxygen demand of the water.

[0038] The ultrasonic homogenizing reaction tank 8 includes: an ultrasonic homogenizing reaction tank body and a radioactive organic waste liquid inlet 2 set on the ultrasonic homogenizing reaction tank body, through which radioactive organic waste liquid is introduced.

[0039] The ultrasonic homogenizing reaction unit is used to enhance the reaction rate of radioactive organic waste liquid. It is also used for pH adjustment of radioactive organic waste liquid, performing pH adjustment homogenization and enhancing the mass transfer reaction efficiency between organic matter and oxidizing intermediates.

[0040] Preferably, the electrocatalytic oxidation reaction unit includes: an electrocatalytic oxidation reactor 13, an electrocatalytic oxidation reactor power supply 12 connected to the electrocatalytic oxidation reactor 13, and the electrocatalytic oxidation reactor 13 is connected to an ultrasonic homogenization reaction unit and a microwave catalytic reaction unit, respectively.

[0041] The electrocatalytic oxidation reaction unit is used to generate highly oxidizing intermediates or directly oxidize and decompose organic matter in radioactive organic waste liquid through electrocatalysis. The electrocatalytic oxidation reactor 13 includes an electrocatalytic module, and the electrode material in the electrocatalytic module is boron-doped diamond electrode material.

[0042] Preferably, the radioactive organic waste liquid treatment system further includes: an online hydrogen alarm 7 and a control unit. The online hydrogen alarm 7 is installed on the exhaust pipe connected to the gas outlet of the ultrasonic homogenizing reaction unit. When the online hydrogen alarm 7 detects that the hydrogen content in the exhaust pipe exceeds the preset hydrogen content, it issues an alarm and sends the hydrogen content to the control unit. The control unit controls the shutdown of the power supply 12 of the electrocatalytic oxidation reactor.

[0043] Preferably, the electrocatalytic oxidation reactor 13 includes: a cathode, an anode, a membrane module, and a membrane shell. The membrane shell surrounds a reaction chamber, inside which the anode and cathode are arranged. The membrane module is sandwiched between the cathode and anode. The membrane shell is made of 316L material and lined with an insulating coating. The anode is made of silicon-based modified boron-doped diamond material, and the cathode is made of pure titanium material. The distance between the cathode and anode plates is 1.5–5 mm. The electrocatalytic oxidation reactor 13 adopts an integrated flow-through design, and the smaller plate spacing can significantly reduce the resistance heating effect, saving 10–30% energy compared to traditional DSA metal oxidation electrode groups.

[0044] Specifically, in this embodiment, the distance between the cathode and anode plates of the electrocatalytic oxidation reactor 13 is 3 mm.

[0045] Preferably, the radioactive organic waste liquid treatment system further includes: Heat exchanger 21 has its inlet connected to the microwave catalytic reaction unit and its outlet connected to the ultrasonic homogenizing reaction unit. Heat exchanger 21 is used to introduce a cold source to cool the liquid material discharged from the microwave catalytic reaction unit. The cooled liquid material then flows into the ultrasonic homogenizing reaction unit.

[0046] Preferably, the inlet of heat exchanger 21 is also connected to the electrocatalytic oxidation reaction unit, and heat exchanger 21 is also used to introduce a cold source to cool the liquid material discharged from the electrocatalytic oxidation reaction unit. The cooled liquid material flows into the ultrasonic homogenizing reaction unit.

[0047] Preferably, the radioactive organic waste liquid treatment system further includes: a first pipeline, a first valve 14, a second pipeline, a second valve 15, a third pipeline, and a third valve 20. The electrocatalytic oxidation reaction unit and the microwave catalytic reaction unit are connected through a first pipeline, and a first valve 14 is provided on the first pipeline; The electrocatalytic oxidation reaction unit is connected to the inlet of the heat exchanger 21 through a second pipe. A second valve 15 is installed on the second pipe. The second pipe is connected to the first pipe. The first valve 14 is located downstream of the connection point between the second pipe and the first pipe. The microwave catalytic reaction unit is connected to the inlet of heat exchanger 21 via a third pipe, and a third valve 20 is installed on the third pipe. The catalyst in the microwave catalytic reaction unit is regenerated by closing the first valve 14 and the third valve 20, and opening the second valve 15. The first pipe is the feed pipe, the second pipe is the exhaust pipe, and the third pipe is the discharge pipe. The first valve 14 is a first electric valve, the second valve 15 is a second electric valve, and the third valve 20 is a third electric valve. The radioactive organic waste liquid treatment system further includes a fourth valve 19, which is located at the bottom of the microwave catalytic reaction unit. The fourth valve 19 is a vent valve and a fourth electric valve.

[0048] The microwave catalytic reaction unit switches between catalytic reaction mode and in-situ catalyst regeneration mode via valve switching.

[0049] Preferably, the microwave catalytic reaction unit includes: a microwave catalytic reactor 16 and a catalyst 18 disposed within the microwave catalytic reactor 16, the catalyst 18 being used to catalyze the reaction of radioactive organic waste liquid. The microwave catalytic reaction unit includes: a catalyst filling tube and a screen disposed within the microwave catalytic reactor 16, the screen being detachably connected to both ends of the filling tube, and the catalyst filling tube being used to fill the catalyst 18. The catalyst filling tube uses a porous modified polytetrafluoroethylene (PTFE) material with high microwave transmittance, and both ends are encapsulated with 10-mesh detachable screens to seal the catalyst 18 within the tube.

[0050] The microwave catalytic reaction unit is used for the degradation of radioactive organic waste liquid and the regeneration of catalyst 18 within it.

[0051] Under normal operating conditions, the electrocatalytic oxidation reactor 13 electrolytically oxidizes radioactive organic waste liquid, generating strong oxidizing intermediates such as hydroxyl radicals and ozone. These intermediates are then introduced into the microwave catalytic reactor 16, where Fe2O3 in the modified activated carbon is oxidized to high-valent Fe(IV). Simultaneously, under the action of microwave energy, numerous local hot spots are formed inside the activated carbon. Through the action of "high-temperature hot spots + ferric oxidation," the organic matter adsorbed inside the activated carbon is completely mineralized and decomposed, while ferric iron is reduced to ferric iron for recycling. This system innovatively combines the electrocatalytic oxidation reactor 13 with the microwave catalytic reactor 16 and the modified activated carbon catalyst. On the one hand, by utilizing the strong oxidizing intermediates generated by electrocatalytic oxidation, it effectively solves the problem of continuously adding high-sulfate reagents required in traditional microwave catalytic oxidation. On the other hand, by utilizing the adsorption capacity of activated carbon, organic matter is adsorbed in the pores of the activated carbon and comes into efficient contact with the catalyst, solving the problem of low mass transfer efficiency at the electrode interface in traditional electrocatalytic oxidation technology.

[0052] The microwave catalytic reactor 16, while achieving the synergistic degradation of organic matter by forming high-temperature hotspots on the surface of the modified activated carbon catalyst using microwave energy, can also achieve in-situ regeneration of the modified activated carbon catalyst after the microwave catalytic reactor 16 vents the radioactive organic waste liquid by controlling the closure of the first valve 14 and the second valve 15 and the opening of the third valve 20, and setting microwave operating conditions. This innovative design of the microwave catalytic reactor 16 simultaneously achieves the catalytic oxidation of radioactive organic waste liquid and the in-situ regeneration of the catalyst. On the one hand, it improves the catalyst's lifespan and significantly reduces the production of radioactive solid waste; on the other hand, it solves the problem of catalyst non-renewability due to potential radioactive irradiation risks.

[0053] Preferably, the catalyst is a Fe-Bi / AC modified microwave catalyst, and the catalyst preparation method includes the following steps: (1) Weigh out activated carbon, ferric nitrate and bismuth nitrate in a mass ratio of (6~8):(1~3):(0.5~1.5). Dissolve ferric nitrate and bismuth nitrate in 0.5~1.0M dilute nitric acid to impregnate and obtain an impregnation solution. Add activated carbon to the impregnation solution for impregnation and dry to obtain impregnated and dried activated carbon. Specifically, in this embodiment, the mass ratio of activated carbon, ferric nitrate and bismuth nitrate is 7:2:1.

[0054] (2) Under an inert atmosphere, the impregnated and dried activated carbon was calcined at 500~600℃ for 2~4h to obtain the Fe-Bi / AC modified microwave catalyst. Specifically, in this embodiment, the calcination temperature was 550℃ and the calcination time was 3h.

[0055] More preferably, the preparation method of Fe-Bi / AC modified microwave catalyst includes the following steps: (i) Select coconut shell activated carbon with an iodine value ≥1000, remove ash by sieving, soak it in a 0.7~0.9mol / L HNO3 solution, stir at a constant temperature of 65-70°C for 8-10 hours, rinse with ultrapure water until neutral, and dry in a vacuum drying oven at 100°C~110°C for 11-13 hours, then cool for later use. Specifically, in this example, the concentration of HNO3 solution is 0.8M, the mixture is stirred at a constant temperature of 65°C for 9 hours, and then dried in a vacuum drying oven at 105°C for 12 hours.

[0056] (1) Pretreated dried activated carbon, ferric nitrate, and bismuth nitrate were weighed in a mass ratio of (6~8):(1~3):(0.5~1.5). Ferric nitrate and bismuth nitrate were dissolved in 0.5~1.0M dilute nitric acid. An appropriate amount of ultrapure water was added, and the mixture was stirred thoroughly for 0.5~1h under a magnetic stirrer. The weighed dried activated carbon was slowly added to the impregnation solution and impregnated at room temperature for 4~6h. After stirring was stopped, the temperature was adjusted to 80~90℃ to evaporate excess water. The activated carbon impregnated with the metal was placed in a vacuum drying oven and dried at 110~130℃ for 6~12h to completely remove moisture, resulting in columnar impregnated ferric nitrate and bismuth nitrate. Specifically, in this embodiment, the concentration of dilute nitric acid was 0.5M, the mixing time after adding ultrapure water was 1h, the impregnation time of activated carbon after adding the impregnation solution was 6h, and the stirring was stopped and the temperature was adjusted to 85℃ to evaporate excess water. The drying temperature in the vacuum drying oven is 120℃, and the drying time is 6 hours.

[0057] (2) The impregnated and dried activated carbon was placed in a tube furnace, and nitrogen gas was introduced into the muffle furnace at a flow rate of 250-500 mL / min. Under an inert atmosphere, the temperature was programmed to rise to 500-600 °C at a rate of 5-12 °C / min and calcined for 2-4 h. After natural cooling, the preparation was completed, and the Fe-Bi / AC modified microwave catalyst was obtained. Specifically, in this embodiment, nitrogen gas was introduced into the muffle furnace at a flow rate of 400 mL / min, and the temperature was programmed to rise to 550 °C at a rate of 10 °C / min under an inert atmosphere and calcined for 3 h.

[0058] The preparation methods of the catalyst include activated carbon pretreatment, metal impregnation, drying and inert atmosphere calcination.

[0059] Preferably, the radioactive organic waste liquid treatment system further includes: The exhaust gas purifier 22 is connected to both the ultrasonic homogenizing reaction unit and the microwave catalytic reaction unit, and is used to purify the exhaust gas discharged into it. The radioactive organic waste liquid treatment system also includes a negative pressure fan 23, which is connected to the exhaust gas purifier 22 and is used to draw negative pressure from the exhaust gas purifier 22.

[0060] The exhaust gas purifier 22 is used to treat the hydrogen and organic waste gas generated during the reaction process. The radioactive organic waste liquid treatment system also includes a sixth valve 17, which is installed on the connecting pipe between the exhaust gas purifier 22 and the microwave catalytic reaction unit. The sixth valve 17 is an electrically operated valve.

[0061] Preferably, the radioactive organic waste liquid treatment system further includes: The condenser 6 is connected to the outlet of the ultrasonic homogenizing reaction unit and is also connected to the exhaust gas purifier 22. The condenser 6 is used to condense the exhaust gas discharged from the ultrasonic homogenizing reaction unit. The condensed liquid flows back into the ultrasonic homogenizing reaction unit, and the unliquefied exhaust gas is discharged into the exhaust gas purifier 22.

[0062] Hydrogen generated during the electrocatalytic oxidation side reaction in the electrocatalytic oxidation reactor unit, carbon dioxide generated from the oxidation of organic matter in the radioactive organic waste liquid, and volatile organic waste gas are partially condensed and recovered by the condenser 6 connected to the ultrasonic homogenizing reaction tank 8, reducing the processing load of the waste gas purifier 22. An online hydrogen alarm 7 is installed at the rear end of the condenser 6 to detect the hydrogen content in the exhaust gas and interlock with the control unit. When the hydrogen level exceeds the alarm limit, the power supply 12 of the electrocatalytic oxidation reactor is immediately shut off to avoid the risk of hydrogen explosion. Waste gas generated during the oxidation of radioactive organic waste liquid and waste gas generated during the catalyst regeneration process in the microwave catalytic reactor 16 are all absorbed and treated by the waste gas purifier 22 before being discharged.

[0063] Preferably, the radioactive organic waste liquid treatment system further includes: A security filter 11 is included, with its inlet connected to the ultrasonic homogenizing reaction unit and its outlet connected to the electrocatalytic oxidation reaction unit. The security filter 11 is used to filter materials entering the unit. The radioactive organic waste liquid treatment system also includes a circulation pump 9 and a fifth valve 10, which is a fifth electrically operated valve. The circulation pump 9 and the fifth valve 10 are located on the connecting pipe between the security filter 11 and the ultrasonic homogenizing reaction tank 8, with the fifth valve 10 downstream of the circulation pump 9.

[0064] The electrocatalytic oxidation reaction unit, in conjunction with the security filter 11, can effectively prevent the electrocatalytic module of the electrocatalytic oxidation reaction unit from becoming clogged.

[0065] This embodiment also provides a method for treating radioactive organic waste liquid using the above-described radioactive organic waste liquid treatment system, comprising the following steps: Radioactive organic waste liquid is passed into an ultrasonic homogenizing reaction unit to enhance the mass transfer and reaction of the radioactive organic waste liquid; Then, the material is introduced into the electrocatalytic oxidation reaction unit to undergo an electrocatalytic oxidation reaction. Then, the microwave catalytic reaction unit is introduced to carry out a microwave catalytic reaction on the material introduced into it.

[0066] Preferably, the ultrasonic frequency of the ultrasonic homogenizing reaction unit is 23~33KHz. The ultrasonic homogenizing reaction tank 8 is equipped with an ultrasonic generator 5, which has an ultrasonic frequency of 28KHz. The ultrasonic homogenizing reaction tank 8 enhances the mass transfer efficiency between organic matter and oxidizing intermediates generated by electrocatalytic oxidation and microwave catalytic oxidation processes through ultrasound, thereby improving the utilization rate of oxidizing intermediates. On the other hand, ultrasonic cavitation can also achieve the oxidative decomposition of some organic matter.

[0067] Preferably, the operating current density of the electrocatalytic oxidation reaction unit is 500–600 mA / m 2 The operating voltage is 0.1 to 36V.

[0068] Preferably, the microwave catalytic reaction unit operates under the following conditions: operating frequency 2.35~2.55GHz, power 0.5~5kW.

[0069] Preferably, the microwave catalytic reaction unit operates under the following conditions for microwave regeneration: operating frequency 2.35~2.55GHz; first operating stage: power 1~5kW, operating time 5~10min; second operating stage: power 3~10kW, operating time 15~30min.

[0070] Specifically, in this embodiment, the microwave catalytic reaction unit operates under the following conditions for microwave regeneration: operating frequency 2.45 GHz; first operating stage: power 3 kW, operating time 5 min; second operating stage: power 5 kW, operating time 15 min.

[0071] The radioactive organic waste liquid treatment system and method described in this embodiment are used for the treatment of radioactive organic waste liquid in a batch processing manner, and are applied to the treatment of low-level radioactive organic waste liquid in the nuclear industry.

[0072] Specifically, this embodiment also provides a method for treating radioactive organic waste liquid using the above-mentioned radioactive organic waste liquid treatment system, including the following steps: (1) Pre-treat radioactive organic waste liquid and adjust the pH to 7-9; (2) Pump the radioactive organic waste liquid into the ultrasonic homogenizing reaction tank 8, add hydrochloric acid or strong sodium hydroxide, and detect the pH value through the online pH detector 3 to adjust the pH of the waste liquid to be stable in the range of 7 to 9. (3) Radioactive organic waste liquid is sequentially sent to the electrocatalytic oxidation reaction unit and the microwave catalytic reaction unit by the circulation pump 9 and then returned to the ultrasonic homogenization reaction unit for circulation treatment. The organic matter in the waste liquid is decomposed into carbon dioxide and water by the synergistic effect of electrocatalytic oxidation, microwave catalysis and ultrasonic enhancement. (4) Monitor the COD value of radioactive organic waste liquid and discharge it after it meets the standard; (5) The waste gas generated during the oxidation and regeneration processes is treated by the waste gas purifier 22; (6) When the activity of the catalyst in the microwave catalytic reactor 16 decreases, switch to the regeneration mode and recycle the catalyst filled in it using microwave regeneration.

[0073] The specific implementation of the above-mentioned radioactive organic waste liquid treatment system for treating radioactive organic waste liquid is as follows: After the radioactive organic waste liquid is pumped into the ultrasonic homogenizing reaction tank 8, the metering pump is controlled to pump in the prepared strong sodium hydroxide or hydrochloric acid solution. The pH value is detected by the online pH meter 3, and the pH value of the radioactive organic waste liquid is adjusted to stabilize in the range of 7 to 9.

[0074] The circulating pump 9 is started to lift the pretreated radioactive organic waste liquid to the security filter 11. After removing large particulate impurities, it enters the electrocatalytic oxidation reaction unit. After electrocatalytic oxidation treatment, the effluent is treated by opening the first valve 14 and the second valve 15, and closing the third valve 20. This controls the radioactive organic waste liquid to enter the microwave catalytic reactor 16. The heat exchanger 21 controls the reaction temperature to be stabilized at 50-55℃, and finally the effluent enters the ultrasonic homogenizing reaction tank 8 for circulation treatment. During the circulation of the radioactive organic waste liquid, the organic matter in the waste liquid is rapidly mineralized and decomposed under the synergistic effect of electrocatalytic oxidation, microwave catalytic oxidation, and ultrasonic enhanced mass transfer.

[0075] When the online COD monitor 1 detects that the COD content in the radioactive organic waste liquid reaches the treatment index, it sends the information to the control unit. The control unit automatically closes the circulation pump 9 and the fifth valve 10. The electric valve 24 is connected to the circulation pump 9, and then the electric valve 24 and the circulation pump 9 are opened in sequence. The pipeline connected to the electric valve 24 is used to discharge the waste liquid. The waste liquid that has been treated to meet the COD standard is discharged into the downstream process or storage tank, realizing the sequential batch treatment of radioactive organic waste liquid.

[0076] When the Fe-Bi / AC catalyst filled in the microwave catalytic reactor 16 experiences reduced catalytic activity due to pore blockage caused by organic matter, the control unit opens the second valve 15, closes the first valve 14 and the third valve 20, and opens the fourth valve 19 to drain the organic waste liquid from the microwave catalytic reactor 16. Then, the sixth valve 17 is opened. The regeneration conditions of the microwave catalytic reactor 16 are set, and the catalyst is regenerated in a microwave environment. The generated waste gas is discharged through the sixth valve 17 to the waste gas purifier 22 for treatment to meet emission standards before being discharged. After regeneration, the microwave catalytic reactor 16 can be switched back to catalytic operation, achieving online catalyst regeneration. This reduces radioactive solid waste and minimizes human intervention, effectively reducing the risk of radiation exposure for personnel.

[0077] The method in this embodiment treats low-level radioactive organic wastewater containing formaldehyde, ethanol, and polyvinyl alcohol generated during the operation of nuclear facilities. The initial COD content is 90,000–150,000 mg / L, and the pH value is 9.5–11. The system is used for treatment under the following conditions: nitric acid / hydrochloric acid is added to the ultrasonic homogenizing reaction tank 8 to adjust the pH of the radioactive organic wastewater to 8–9; the electrocatalytic oxidation reactor 13 is set to operate at a current density of 600 A / cm³. 2 The electrocatalytic oxidation reactor 13 operates at a voltage of 15V, the microwave catalytic reactor 16 operates at a power of 3kW and a frequency of 2.35GHz, the ultrasonic generator 5 operates at a power of 5kW, and the system reaction temperature is set at 55℃. After the waste liquid is circulated and treated under the above operating conditions for 26 hours, the COD content of the radioactive organic waste liquid is reduced from 156,800mg / L to less than 40mg / L.

[0078] The radioactive organic waste liquid treatment system in this embodiment adopts a continuous feeding mode. The system can flexibly respond to continuous feeding, has good operational flexibility, high treatment efficiency, and stable operation.

[0079] This embodiment provides a radioactive organic waste liquid treatment system and a method for treating radioactive organic waste liquid. The method has the advantages of small footprint, no chemical dosing, no radioactive solid waste, simple operation, and good treatment effect. The chemical oxygen demand of the treated waste liquid can be reduced to less than 40 mg / L.

[0080] This embodiment presents an innovative treatment technology for radioactive organic waste liquid that requires no external chemical reagents, generates minimal secondary radioactive solid waste, is adaptable to intermittent operation, and offers thorough treatment while being economical and safe to operate. This embodiment integrates electrocatalytic oxidation, microwave catalysis and regeneration, and ultrasonic enhancement technologies to construct a highly efficient sequencing batch reactor (SBR) co-processing system. This system primarily utilizes the strong oxidizing free radicals generated in situ by the electrocatalytic oxidation reaction unit to thoroughly degrade organic matter. Innovatively, by switching operation via a microwave reactor, it simultaneously achieves microwave-assisted oxidation of organic matter and in-situ regeneration of the deactivated catalyst, fundamentally reducing the generation of radioactive solid waste and providing a novel solution for the treatment of low-radioactive organic waste liquid.

[0081] Example 3

[0082] This embodiment also provides a method for treating radioactive organic waste liquid using the radioactive organic waste liquid treatment system in Embodiment 2. The difference between this method and the method in Embodiment 2 is as follows: The method in this embodiment treats radioactive organic waste liquid containing TBP / kerosene extractant generated by a nuclear laboratory, with an initial COD content of 80,000 mg / L and a pH value of 3-5. The system is used for treatment under the following conditions: sodium hydroxide is added to the ultrasonic homogenizing reaction tank to adjust the pH of the radioactive organic waste liquid to 6-7; the electrocatalytic oxidation reactor is set to a working current density of 550 A / cm². 2 The electrocatalytic oxidation reactor operates at a voltage of 36V, the microwave catalytic reactor operates at a power of 1.5kW and a frequency of 2.55GHz, the ultrasonic generator operates at a power of 3kW, and the system reaction temperature is set at 55℃. After the waste liquid is circulated and treated under the above conditions for 14 hours, the COD content of the radioactive organic waste liquid is reduced from 804800mg / L to less than 100mg / L.

[0083] Specifically, in this embodiment, the distance between the cathode and anode plates of the electrocatalytic oxidation reactor is 1.5 mm.

[0084] In step (i) of the catalyst preparation method, the concentration of HNO3 solution is 0.7M, and it is stirred at a constant temperature of 70°C for 10 hours, and then placed in a vacuum drying oven and dried at 110°C for 13 hours.

[0085] In step (1) of the catalyst preparation method, activated carbon, ferric nitrate, and bismuth nitrate are mixed in a mass ratio of 6:3:0.5. The concentration of dilute nitric acid is 0.8M. The mixing time after adding ultrapure water is 0.5h, and the impregnation time of activated carbon after adding the impregnation solution is 5h. Stirring is stopped and the temperature is adjusted to 80℃ to evaporate excess water. The drying temperature in the vacuum drying oven is 110℃, and the drying time is 10h.

[0086] In step (2) of the catalyst preparation method, the activated carbon is calcined at 500℃ for 4 hours. Nitrogen gas is introduced into the muffle furnace at a flow rate of 250 mL / min, and the temperature is increased to 500℃ at a programmed rate of 5℃ / min under an inert atmosphere, and calcination is continued for 4 hours.

[0087] In this embodiment, the ultrasonic generator is selected with an ultrasonic frequency of 23KHz.

[0088] Specifically, in this embodiment, the microwave catalytic reaction unit operates under the following conditions for microwave regeneration: operating frequency 2.35 GHz; first operating stage: power 1 kW, operating time 7 min; second operating stage: power 3 kW, operating time 20 min.

[0089] This embodiment provides a radioactive organic waste liquid treatment system and a method for treating radioactive organic waste liquid. The method has the advantages of small footprint, no chemical dosing, no radioactive solid waste, simple operation, and good treatment effect. The chemical oxygen demand of the treated waste liquid can be reduced to less than 40 mg / L.

[0090] This embodiment presents an innovative treatment technology for radioactive organic waste liquid that requires no external chemical reagents, generates minimal secondary radioactive solid waste, is adaptable to intermittent operation, and offers thorough treatment while being economical and safe to operate. This embodiment integrates electrocatalytic oxidation, microwave catalysis and regeneration, and ultrasonic enhancement technologies to construct a highly efficient sequencing batch reactor (SBR) co-processing system. This system primarily utilizes the strong oxidizing free radicals generated in situ by the electrocatalytic oxidation reaction unit to thoroughly degrade organic matter. Innovatively, by switching operation via a microwave reactor, it simultaneously achieves microwave-assisted oxidation of organic matter and in-situ regeneration of the deactivated catalyst, fundamentally reducing the generation of radioactive solid waste and providing a novel solution for the treatment of low-radioactive organic waste liquid.

[0091] Example 4

[0092] This embodiment also provides a method for treating radioactive organic waste liquid using the radioactive organic waste liquid treatment system in Embodiment 2. The difference between this method and the method in Embodiment 2 is as follows: In this embodiment, the distance between the cathode and anode plates of the electrocatalytic oxidation reactor is 5 mm.

[0093] In step (i) of the catalyst preparation method, the concentration of HNO3 solution is 0.9M, and it is stirred at a constant temperature of 67°C for 8 hours, and then placed in a vacuum drying oven and dried at 100°C for 11 hours.

[0094] In step (1) of the catalyst preparation method, activated carbon, ferric nitrate, and bismuth nitrate are mixed in a mass ratio of 8:1:1.5. The concentration of dilute nitric acid is 1.0M. The mixing time after adding ultrapure water is 0.7h. The impregnation time of activated carbon after adding the impregnation solution is 4h. Stirring is stopped and the temperature is adjusted to 90℃ to evaporate excess water. The drying temperature in the vacuum drying oven is 130℃, and the drying time is 12h.

[0095] In step (2) of the catalyst preparation method, the activated carbon is calcined at 600℃ for 2 hours. Nitrogen gas is introduced into the muffle furnace at a flow rate of 500 mL / min, and the temperature is increased to 600℃ at a programmed rate of 12℃ / min under an inert atmosphere, and calcination is continued for 2 hours.

[0096] In this embodiment, the ultrasonic generator is selected with an ultrasonic frequency of 33KHz.

[0097] The operating current density of the electrocatalytic oxidation reactor was set to 500 A / cm². 2 The operating voltage of the electrocatalytic oxidation reactor is 0.1V, the operating power of the microwave catalytic reactor is set to 5kW, the operating frequency of the microwave catalytic reactor is 2.45GHz, the operating power of the ultrasonic generator is set to 5kW, and the system reaction temperature is set to 55℃.

[0098] Specifically, in this embodiment, the microwave catalytic reaction unit operates under the following conditions for microwave regeneration: operating frequency 2.55 GHz; first operating stage: power 5 kW, operating time 10 min; second operating stage: power 10 kW, operating time 30 min.

[0099] This embodiment provides a radioactive organic waste liquid treatment system and a method for treating radioactive organic waste liquid. The method has the advantages of small footprint, no chemical dosing, no radioactive solid waste, simple operation, and good treatment effect. The chemical oxygen demand of the treated waste liquid can be reduced to less than 40 mg / L.

[0100] This embodiment presents an innovative treatment technology for radioactive organic waste liquid that requires no external chemical reagents, generates minimal secondary radioactive solid waste, is adaptable to intermittent operation, and offers thorough treatment while being economical and safe to operate. This embodiment integrates electrocatalytic oxidation, microwave catalysis and regeneration, and ultrasonic enhancement technologies to construct a highly efficient sequencing batch reactor (SBR) co-processing system. This system primarily utilizes the strong oxidizing free radicals generated in situ by the electrocatalytic oxidation reaction unit to thoroughly degrade organic matter. Innovatively, by switching operation via a microwave reactor, it simultaneously achieves microwave-assisted oxidation of organic matter and in-situ regeneration of the deactivated catalyst, fundamentally reducing the generation of radioactive solid waste and providing a novel solution for the treatment of low-radioactive organic waste liquid.

[0101] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of the present invention, and the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A radioactive organic waste liquid treatment system, characterized in that, include: Ultrasonic homogenizing reaction unit is used to enhance mass transfer and reaction of radioactive organic waste liquid; An electrocatalytic oxidation reaction unit is connected to an ultrasonic homogenizing reaction unit. The electrocatalytic oxidation reaction unit is used to perform electrocatalytic oxidation reactions on the materials introduced into it. The microwave catalytic reaction unit is connected to the electrocatalytic oxidation reaction unit. The microwave catalytic reaction unit is used to perform microwave catalytic reactions on the materials introduced into it.

2. The radioactive organic waste liquid treatment system according to claim 1, characterized in that, The ultrasonic homogenizing reaction unit includes: an ultrasonic homogenizing reaction tank and an ultrasonic generator. The ultrasonic generator is mounted on the ultrasonic homogenizing reaction tank. The ultrasonic homogenizing reaction unit also includes: an immersion level gauge, an online COD monitor, and an online pH meter. The immersion level gauge is mounted on the ultrasonic homogenizing reaction tank and is used to detect the liquid level. The online COD monitor is connected to the ultrasonic homogenizing reaction tank and is used to detect COD. The online pH meter is mounted on the ultrasonic homogenizing reaction tank and is used to detect the pH value online.

3. The radioactive organic waste liquid treatment system according to claim 1, characterized in that, The electrocatalytic oxidation reaction unit includes: an electrocatalytic oxidation reactor, an electrocatalytic oxidation reactor power supply connected to the electrocatalytic oxidation reactor, and the electrocatalytic oxidation reactor is connected to an ultrasonic homogenization reaction unit and a microwave catalytic reaction unit, respectively.

4. The radioactive organic waste liquid treatment system according to claim 3, characterized in that, Also includes: An online hydrogen alarm and control unit are included. The online hydrogen alarm is installed on the exhaust pipe connected to the gas outlet of the ultrasonic homogenizing reaction unit. When the online hydrogen alarm detects that the hydrogen content in the exhaust pipe exceeds the preset hydrogen content, it issues an alarm and sends the hydrogen content to the control unit. The control unit then controls the power supply of the electrocatalytic oxidation reactor to be shut off.

5. The radioactive organic waste liquid treatment system according to claim 3, characterized in that, The electrocatalytic oxidation reactor includes: a cathode, an anode, a membrane module, and a membrane shell. The membrane shell forms a reaction chamber, and the anode and cathode are arranged inside the reaction chamber. The membrane module is sandwiched between the cathode and anode. The membrane shell is made of 316L material and lined with an insulating coating. The anode is made of silicon-based modified boron-doped diamond material, and the cathode is made of pure titanium material. The distance between the cathode and anode plates is 1.5 to 5 mm.

6. The radioactive organic waste liquid treatment system according to claim 1, characterized in that, Also includes: The heat exchanger has its inlet connected to the microwave catalytic reaction unit and its outlet connected to the ultrasonic homogenizing reaction unit. The heat exchanger is used to introduce a cold source to exchange heat and cool the liquid material discharged from the microwave catalytic reaction unit.

7. The radioactive organic waste liquid treatment system according to claim 6, characterized in that, The inlet of the heat exchanger is also connected to the electrocatalytic oxidation reaction unit, and the heat exchanger is also used to introduce a cold source to exchange heat and cool down the liquid material discharged from the electrocatalytic oxidation reaction unit.

8. The radioactive organic waste liquid treatment system according to claim 7, characterized in that, Also includes: First pipeline, first valve, second pipeline, second valve, third pipeline, third valve. The electrocatalytic oxidation reaction unit and the microwave catalytic reaction unit are connected through a first pipeline, and a first valve is installed on the first pipeline. The electrocatalytic oxidation reaction unit is connected to the inlet of the heat exchanger via a second pipe. A second valve is installed on the second pipe. The second pipe is connected to the first pipe. The first valve is located downstream of the connection point between the second pipe and the first pipe. The microwave catalytic reaction unit is connected to the inlet of the heat exchanger via a third pipe, and a third valve is installed on the third pipe. By closing the first valve and the third valve and opening the second valve, the catalyst in the microwave catalytic reaction unit is regenerated.

9. The radioactive organic waste liquid treatment system according to claim 1, characterized in that, The microwave catalytic reaction unit includes: a microwave catalytic reactor and a catalyst placed inside the microwave catalytic reactor. The catalyst is used to catalyze the reaction of radioactive organic waste liquid.

10. The radioactive organic waste liquid treatment system according to claim 9, characterized in that, The catalyst is a Fe-Bi / AC modified microwave catalyst, and the preparation method of the catalyst includes the following steps: (1) Weigh out activated carbon, ferric nitrate and bismuth nitrate in a mass ratio of (6~8): (1~3): (0.5~1.5). Dissolve ferric nitrate and bismuth nitrate in 0.5~1.0M dilute nitric acid to impregnate and obtain an impregnation solution. Add activated carbon to the impregnation solution for impregnation and dry it to obtain impregnated and dried activated carbon. (2) Under an inert atmosphere, the impregnated and dried activated carbon is calcined at 500~600℃ for 2~4h to obtain Fe-Bi / AC modified microwave catalyst.

11. The radioactive organic waste liquid treatment system according to claim 1, characterized in that, Also includes: The exhaust gas purifier is connected to the ultrasonic homogenizing reaction unit and the microwave catalytic reaction unit respectively. The exhaust gas purifier is used to purify the exhaust gas discharged into it.

12. The radioactive organic waste liquid treatment system according to claim 11, characterized in that, Also includes: The condenser is connected to the outlet of the ultrasonic homogenizing reaction unit and also to the exhaust gas purifier. The condenser is used to condense the exhaust gas discharged from the ultrasonic homogenizing reaction unit. The condensed liquid flows back into the ultrasonic homogenizing reaction unit, and the unliquefied exhaust gas is discharged into the exhaust gas purifier.

13. The radioactive organic waste liquid treatment system according to any one of claims 1 to 12, characterized in that, Also includes: The security filter has its inlet connected to the ultrasonic homogenization reaction unit and its outlet connected to the electrocatalytic oxidation reaction unit. The security filter is used to filter the materials passing into it.

14. A method for treating radioactive organic waste liquid using the radioactive organic waste liquid treatment system according to any one of claims 1 to 13, characterized in that, Includes the following steps: Radioactive organic waste liquid is passed into an ultrasonic homogenizing reaction unit to enhance the mass transfer and reaction of the radioactive organic waste liquid; Then, the material is introduced into the electrocatalytic oxidation reaction unit to undergo an electrocatalytic oxidation reaction. Then, the microwave catalytic reaction unit is introduced to carry out a microwave catalytic reaction on the material introduced into it.

15. The method for treating radioactive organic waste liquid according to claim 14, characterized in that, The ultrasonic frequency of the ultrasonic homogenizing reaction unit is 23~33KHz.

16. The method for treating radioactive organic waste liquid according to claim 14, characterized in that, The operating current density of the electrocatalytic oxidation reaction unit is 500–600 mA / m 2 The operating voltage is 0.1 to 36V.

17. The method for treating radioactive organic waste liquid according to claim 14, characterized in that, The microwave catalytic reaction unit operates under the following conditions: operating frequency 2.35~2.55GHz, power 0.5~5kW.

18. The method for treating radioactive organic waste liquid according to claim 14, characterized in that, Using the radioactive organic waste liquid treatment system of claim 11, the microwave catalytic reaction unit operates under the following conditions for microwave regeneration: operating frequency 2.35~2.55GHz; first operating stage: power 1~5kW, operating time 5~10min; second operating stage: power 3~10kW, operating time 15~30min.

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