Photocatalytic synergistic adsorption medical nuclide wastewater purification device

Abstract

The present application relates to a kind of medical radionuclide wastewater purification device of photocatalytic synergic adsorption, belong to medical radioactive wastewater treatment technical field.The tank body is communicated with water inlet mechanism in one end, and the other end is communicated with drainage mechanism, the inside of the tank body is sequentially provided with photocatalytic reaction mechanism and adsorption mechanism from the direction of water inlet mechanism to drainage mechanism, for coupling photocatalytic reaction mechanism and adsorption mechanism in the tank body.The present application is conducive to coupling photocatalytic reaction mechanism and adsorption mechanism in the tank body, both can utilize photocatalytic reaction mechanism to degrade organic accompanying pollutants in wastewater, avoid organic matter to occupy adsorption site, then utilize adsorption mechanism to adsorb and intercept radionuclide, to improve the removal efficiency and removal effect of organic matter and radionuclide in nuclide, can also reduce the floor area of overall device, adapt to the processing demand of medical scene miniaturization.

Description

Technical Field

[0001] This invention relates to the field of medical radioactive wastewater treatment technology, and in particular to a photocatalytic synergistic adsorption device for purifying medical radionuclide wastewater. Background Technology

[0002] With the widespread application of nuclear medicine diagnostic and treatment technologies in medical institutions, various radionuclides (such as iodine-131, fluorine-18, molybdenum-99, technetium-99m, iodine-123, phosphorus-32, strontium-89, radium-223, samarium-153, actinium-225, lutetium-177, iridium-90, etc.) generate a large amount of low-concentration radioactive wastewater during diagnosis and treatment. If this wastewater is discharged directly without meeting the standards, it will cause long-term radioactive hazards to the surrounding ecological environment and human health. It must undergo professional purification treatment to reduce the radioactivity to below the national limit before it can be discharged or reused.

[0003] Currently, conventional treatment processes for medical radionuclide wastewater mostly employ single adsorption or simple photocatalysis, which have significant technical drawbacks: single adsorption processes rely on the physical adsorption of adsorption materials, resulting in limited removal efficiency for some soluble radionuclides, easy saturation of adsorption capacity, and frequent material replacement; while simple photocatalysis processes can degrade some accompanying organic pollutants, they are ineffective in directly removing inorganic radionuclides and cannot achieve radionuclide retention standards on their own; in addition, conventional treatment devices are mostly modular, occupying a large area, with fragmented treatment processes, no synergistic cooperation between photocatalysis and adsorption units, resulting in low treatment efficiency and an inability to meet the miniaturized treatment needs of medical settings. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a medical radionuclide wastewater purification device with photocatalytic synergistic adsorption, so as to solve the above-mentioned problem.

[0005] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: A medical radionuclide wastewater purification device with photocatalytic synergistic adsorption includes a tank, one end of which is connected to a water inlet mechanism and the other end of which is connected to a drainage mechanism. Inside the tank, a photocatalytic reaction mechanism and an adsorption mechanism are arranged sequentially from the water inlet mechanism to the drainage mechanism. The photocatalytic reaction mechanism and the adsorption mechanism are connected.

[0006] The beneficial effects of this invention are as follows: Compared with the existing technologies that use a single adsorption method or a simple photocatalytic treatment method, this invention couples the photocatalytic reaction mechanism and the adsorption mechanism inside the tank. This not only allows the photocatalytic reaction mechanism to degrade organic pollutants in wastewater, avoiding organic matter from occupying adsorption sites, but also allows the adsorption mechanism to adsorb and retain radionuclides, thereby improving the removal efficiency and effect of organic matter and radionuclides in the nuclides. Furthermore, it reduces the overall footprint of the device, making it suitable for the miniaturized processing needs of medical scenarios.

[0007] Based on the above technical solution, the present invention can be further improved as follows.

[0008] Furthermore, the tank body is a horizontal cylindrical cavity structure, and its interior is divided into a water distribution chamber, a photocatalytic reaction chamber, an adsorption treatment chamber, and a clear water chamber in sequence from the water inlet mechanism to the drainage mechanism. The water distribution chamber and the photocatalytic reaction chamber are connected by a water distribution plate, and the photocatalytic reaction chamber and the adsorption treatment chamber are sealed and separated by a partition baffle. The upper part between the adsorption treatment chamber and the clear water chamber is sealed and separated by the partition baffle, and the lower part between the adsorption treatment chamber and the clear water chamber is connected by the water distribution plate. The water distribution chamber, the photocatalytic reaction chamber, and the clear water chamber are respectively connected to the water inlet mechanism, the photocatalytic reaction mechanism, and the drainage mechanism. The adsorption mechanism is located in the adsorption treatment chamber.

[0009] The beneficial effects of adopting the above-mentioned further scheme are: it allows the radionuclide wastewater to undergo photocatalytic treatment and adsorption treatment sequentially inside the tank, thereby improving treatment efficiency and effect while reducing the footprint.

[0010] Furthermore, the water inlet mechanism includes a water inlet pipe, one end of which is connected to the water distribution chamber, and a water inlet valve, a water inlet flow meter, and a water inlet pump are installed on the water inlet pipe.

[0011] The beneficial effects of adopting the above-mentioned further scheme are: the inlet pipe facilitates the introduction of radionuclide wastewater from the external radionuclide wastewater storage device into the water distribution chamber; the inlet valve facilitates the control of the on / off state and flow rate of radionuclide wastewater entering the water distribution chamber; the inlet flow meter facilitates the measurement of the flow rate of radionuclide wastewater entering the water distribution chamber; and the inlet pump is used to provide power for wastewater transportation.

[0012] Furthermore, the photocatalytic reaction mechanism includes a supported photocatalytic packing material, an aeration and stirring assembly, a photocatalytic conduit assembly, and an ultraviolet photocatalytic assembly. The supported photocatalytic packing material and the aeration and stirring assembly are both disposed inside the photocatalytic reaction chamber. The aeration and stirring assembly is disposed below the supported photocatalytic packing material. The ultraviolet photocatalytic assembly is disposed inside the photocatalytic conduit assembly. The photocatalytic conduit assembly is disposed outside the tank, with one end connected to the photocatalytic reaction chamber.

[0013] The beneficial effects of adopting the above-mentioned further solutions are as follows: the supported photocatalytic packing is beneficial as a catalyst to reduce the activation energy of the reaction in radionuclide wastewater, thereby improving the efficiency of photodegradation of organic matter in radionuclide wastewater; the aeration and stirring component is beneficial in providing the necessary oxygen in the photocatalytic reaction, thereby generating highly oxidizing free radicals, and also in generating a stirring-like effect, allowing the organic matter in the radionuclide wastewater to continuously renew the surface of the supported photocatalytic packing, preventing suspended solids, colloids, and impurities from adhering to the surface of the supported photocatalytic packing, thereby maintaining a long-term catalytic effect; the photocatalytic conduit component is beneficial in guiding the radionuclide wastewater to the ultraviolet photocatalytic component for photocatalytic reaction, and the ultraviolet photocatalytic component is beneficial in providing energy for the photocatalytic reaction.

[0014] Furthermore, the aeration and stirring assembly includes an aeration pipe and an aeration pump. The aeration pipe is disposed inside the photocatalytic reaction chamber and below the supported photocatalytic packing material. The aeration pump is connected to the aeration pipe.

[0015] The beneficial effects of adopting the above-mentioned further scheme are: the aeration pump is conducive to inputting external air into the aeration pipe, and the air is converted into tiny bubbles in the radionuclide wastewater through the aeration pipe, so as to achieve the functions of oxygen supply and stirring.

[0016] Furthermore, the ultraviolet photocatalytic component includes an ultraviolet lamp tube and a sealing sleeve, the sealing sleeve being fixedly sleeved on the ultraviolet lamp tube. The photocatalytic conduit assembly includes an inlet tube, a reaction tube, and an outlet tube, the reaction tube being sealed and sleeved on the sealing sleeve. One end of the inlet tube and one end of the outlet tube are respectively connected to the two ends of the reaction tube. The other end of the inlet tube is connected to the photocatalytic reaction chamber, and the other end of the outlet tube is connected to the adsorption treatment chamber.

[0017] The beneficial effect of adopting the above-mentioned further scheme is that it facilitates the circumferential irradiation of radionuclide wastewater by ultraviolet light, thereby enabling photocatalytic reactions to degrade the organic matter in the radionuclide wastewater.

[0018] Furthermore, the adsorption treatment chamber is divided into a first adsorption treatment chamber, a second adsorption treatment chamber, and a third adsorption treatment chamber in sequence from the water inlet mechanism to the drainage mechanism. The adsorption mechanism includes a zeolite adsorption block, a modified bentonite adsorption block, and a radionuclide resin adsorption block. The zeolite adsorption block, the modified bentonite adsorption block, and the radionuclide resin adsorption block are respectively disposed inside the first adsorption treatment chamber, the second adsorption treatment chamber, and the third adsorption treatment chamber. The photocatalytic reaction mechanism, the first adsorption treatment chamber, the second adsorption treatment chamber, the third adsorption treatment chamber, and the clear water chamber are sequentially connected, and are used to adsorb the wastewater after photocatalytic treatment by the zeolite adsorption block, the modified bentonite adsorption block, and the radionuclide resin adsorption block in sequence.

[0019] The beneficial effect of adopting the above-mentioned further scheme is that it facilitates the sequential adsorption treatment of wastewater after photocatalytic treatment by zeolite adsorption blocks, modified bentonite adsorption blocks and radionuclide resin adsorption blocks, thereby adsorbing radionuclides in the radionuclide wastewater, so as to finally obtain water that meets the discharge standards.

[0020] Furthermore, the drainage mechanism includes a drainage pipe, one end of which is connected to the clear water chamber. A drainage valve is installed on the drainage pipe, and an online radioactivity monitoring instrument is installed on the drainage pipe from the drainage valve to the clear water chamber.

[0021] The beneficial effects of adopting the above-mentioned further solutions are: the drainage pipe facilitates the discharge of water that has met the treatment standards, and the online radioactivity monitoring instrument facilitates real-time monitoring of the radioactivity activity of the treated water, thereby providing a basis for judging the opening and closing of the drainage valve.

[0022] Furthermore, it also includes a backwashing mechanism, which includes a first backwashing main pipe, on which a backwashing pump and a first regulating valve are installed. One end of the first backwashing main pipe between the backwashing pump and the first regulating valve is connected to a backwashing connecting pipe. A second regulating valve is installed on the backwashing connecting pipe. The other end of the backwashing connecting pipe is connected to a backwashing inlet on the tank body. The backwashing outlet on the tank body is connected to a third backwashing main pipe for discharging the backwashed liquid.

[0023] The beneficial effect of adopting the above-mentioned further solution is that it facilitates flushing of the tank during maintenance and repair, and avoids blockage of the tank interior by catalyst packing or adsorbed materials.

[0024] Furthermore, it also includes a sewage discharge mechanism, which includes a sewage discharge pipe, one end of which is connected to the sewage discharge port at the bottom of the tank, and a sewage discharge valve is installed on the sewage discharge pipe.

[0025] The beneficial effect of adopting the above-mentioned further solution is that it facilitates the cleaning and treatment of impurities deposited in the water distribution cavity during maintenance. Attached Figure Description

[0026] Figure 1 This is a front view of the overall structure provided in an embodiment of the present invention; Figure 2 A rear view of the overall structure provided in an embodiment of the present invention; Figure 3 A top view of the overall structure provided in an embodiment of the present invention; Figure 4 For along Figure 3 A schematic diagram after the section line FF is cut open; Figure 5 This is a schematic diagram of the internal structure of the tank provided in an embodiment of the present invention; Figure 6 This is an enlarged schematic diagram of the photocatalytic conduit assembly and the ultraviolet photocatalytic assembly provided in the embodiments of the present invention.

[0027] in, Figure 5 The dashed arrows in the diagram indicate the flow direction of the radionuclide wastewater inside tank 1.

[0028] The attached diagram lists the components represented by each number as follows: 1. Tank; 2. Water inlet mechanism; 3. Photocatalytic reaction mechanism; 4. Adsorption mechanism; 5. Backwashing mechanism; 6. Sewage discharge mechanism; 7. Drainage mechanism; 8. T-pipe; 11. Water distribution chamber; 12. Photocatalytic reaction chamber; 13. Adsorption treatment chamber; 14. Clear water chamber; 15. Water distribution plate; 16. Dividing baffle; 21. Water inlet pipe; 22. Water inlet valve; 23. Water inlet flow meter; 24. Water inlet pump; 31. Supported photocatalytic packing; 32. Aeration and stirring assembly; 33. Photocatalytic conduit assembly; 34. Ultraviolet photocatalytic assembly; 41. Zeolite adsorption... Attached blocks; 42. Modified bentonite adsorption block; 43. Radionuclide resin adsorption block; 61. Sewage pipe; 62. Sewage valve; 71. Drainage pipe; 72. Drainage valve; 73. Online radioactivity monitoring instrument; 131. First adsorption treatment chamber; 132. Second adsorption treatment chamber; 133. Third adsorption treatment chamber; 134. Packing support mesh; 321. Aeration pipe; 322. Aeration pump; 331. Liquid inlet pipe; 332. Reaction pipe; 333. Liquid outlet pipe; 341. Ultraviolet lamp tube; 342. Sealing sleeve; 501. Backwash pump; 502. First backwash pump 503. Backwash main pipe; 504. First regulating valve; 505. Second regulating valve; 506. Second backwash main pipe; 507. First backwash inlet branch pipe; 508. Second backwash inlet branch pipe; 509. Third backwash inlet branch pipe; 510. Fourth backwash inlet branch pipe; 511. First backwash regulating valve; 512. Second backwash regulating valve; 513. Third backwash regulating valve; 514. Fourth backwash regulating valve; 515. First backwash outlet branch pipe; 516. Second backwash outlet branch pipe; 5 17. Third backwash outlet branch pipe; 518. Fourth backwash outlet branch pipe; 519. Third backwash main pipe; 520. Backwash inlet pipe; 521. Backwash inlet valve; 522. Fifth backwash regulating valve; 523. Sixth backwash regulating valve; 524. Seventh backwash regulating valve; 525. Eighth backwash regulating valve; 1311. Upper cavity of zeolite adsorption layer; 1312. Lower cavity of zeolite adsorption layer; 1321. Lower cavity of modified bentonite adsorption layer; 1331. Upper cavity of radionuclide resin adsorption layer; 1332. Lower cavity of radionuclide resin adsorption layer. Detailed Implementation

[0029] The principles and features of the present invention are described below. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0030] like Figures 1 to 6 As shown, this embodiment provides a medical radionuclide wastewater purification device with photocatalytic synergistic adsorption, including a tank 1. One end of the tank 1 is connected to a water inlet mechanism 2, and the other end is connected to a drainage mechanism 7. Inside the tank 1, a photocatalytic reaction mechanism 3 and an adsorption mechanism 4 are arranged sequentially from the water inlet mechanism 2 to the drainage mechanism 7. The photocatalytic reaction mechanism 3 and the adsorption mechanism 4 are connected.

[0031] It should be noted that in this embodiment, the tank 1 is an integrated horizontal tank with a diameter of 600mm and a length of 2000mm. The outside of the tank is fully covered with a radiation protection layer 2, which is made of lead rubber composite protective material with a thickness of 4mm, and can effectively shield radioactive rays. This embodiment also includes a control mechanism, which is a PLC (Programmable Logic Controller) electrically connected to each mechanism. The signal transmission between the control mechanism and each mechanism is existing technology.

[0032] The beneficial effects of this embodiment are as follows: Compared with the existing technology that uses a single adsorption method or a simple photocatalytic treatment method, this embodiment couples the photocatalytic reaction mechanism and the adsorption mechanism inside the tank. This not only allows the photocatalytic reaction mechanism to degrade organic pollutants in wastewater and avoids organic matter occupying adsorption sites, but also allows the adsorption mechanism to adsorb and retain radionuclides, thereby improving the removal efficiency and effect of organic matter and radionuclides in the nuclides. It also reduces the overall footprint of the device and is suitable for the miniaturized treatment needs of medical scenarios.

[0033] Preferred, such as Figures 1 to 5 As shown, the tank 1 is a horizontal cylindrical cavity structure. Its interior is divided into a water distribution chamber 11, a photocatalytic reaction chamber 12, an adsorption treatment chamber 13, and a clear water chamber 14 in sequence from the water inlet mechanism 2 to the drainage mechanism 7. The water distribution chamber 11 and the photocatalytic reaction chamber 12 are connected by a water distribution plate 15. The photocatalytic reaction chamber 12 and the adsorption treatment chamber 13 are sealed and separated by a partition baffle 16. The upper part of the adsorption treatment chamber 13 and the clear water chamber 14 are sealed and separated by the partition baffle 16. The lower part of the adsorption treatment chamber 13 and the clear water chamber 14 are connected by the water distribution plate 15. The water distribution chamber 11, the photocatalytic reaction chamber 12, and the clear water chamber 14 are respectively connected to the water inlet mechanism 2, the photocatalytic reaction mechanism 3, and the drainage mechanism 7. The adsorption mechanism 4 is disposed in the adsorption treatment chamber 13.

[0034] It should be noted that in this embodiment, the water distribution plate 15 has uniformly distributed water distribution holes with a diameter of 2mm, so that wastewater can be evenly dispersed from the water distribution cavity 11 into the photocatalytic reaction cavity 12.

[0035] The advantages of adopting the above-mentioned preferred scheme are: it allows the radionuclide wastewater to undergo photocatalytic treatment and adsorption treatment sequentially inside the tank, thereby improving treatment efficiency and effect while reducing the footprint.

[0036] Preferred, such as Figure 1 and Figure 4 As shown, the water inlet mechanism 2 includes a water inlet pipe 21, one end of which is connected to the water distribution chamber 11. A water inlet valve 22, a water inlet flow meter 23, and a water inlet pump 24 are installed on the water inlet pipe 21.

[0037] It should be noted that in this embodiment, the other end of the water inlet pipe 21 is connected to an external radionuclide wastewater storage device (not shown), and the water inlet pump 24 is used to pump the radionuclide wastewater in the external radionuclide wastewater storage device into the water inlet pipe 21. The inlet valve 22, the inlet flow meter 23, and the inlet pump 24 are all electrically connected to the control mechanism.

[0038] The advantages of adopting the above-mentioned preferred scheme are: the inlet pipe facilitates the introduction of radionuclide wastewater from the external radionuclide wastewater storage device into the water distribution chamber; the inlet valve facilitates the control of the on / off state and flow rate of radionuclide wastewater entering the water distribution chamber; the inlet flow meter facilitates the measurement of the flow rate of radionuclide wastewater entering the water distribution chamber; and the inlet pump facilitates the provision of power for wastewater transportation.

[0039] Preferred, such as Figure 3 and Figure 4 As shown, the photocatalytic reaction mechanism 3 includes a supported photocatalytic packing material 31, an aeration and stirring assembly 32, a photocatalytic conduit assembly 33, and an ultraviolet photocatalytic assembly 34. The supported photocatalytic packing material 31 and the aeration and stirring assembly 32 are both disposed inside the photocatalytic reaction chamber 12. The aeration and stirring assembly 32 is disposed below the supported photocatalytic packing material 31. The ultraviolet photocatalytic assembly 34 is disposed inside the photocatalytic conduit assembly 33. The photocatalytic conduit assembly 33 is disposed outside the tank 1, and one end of it is connected to the photocatalytic reaction chamber 12.

[0040] It should be noted that in this embodiment, the photocatalytic conduit assembly 33 is fixedly installed on the top outer wall of the tank 1 by a bracket; In the wastewater photocatalytic degradation system, the supported photocatalytic packing 31 serves as a photocatalyst, which excites the wastewater to generate highly oxidizing active free radicals under ultraviolet light. The organic pollutants in the wastewater are the reaction substrates, which are oxidized and decomposed on the surface of the catalyst by the active free radicals, ultimately achieving the mineralization and removal of organic matter. The catalyst and the ultraviolet photocatalytic component 34 can be placed separately. The catalyst reduces the reaction activation energy and improves the photocatalytic efficiency. The catalyst simply reduces the reaction activation energy, making the photocatalytic reaction easier to occur. The supported photocatalytic filler 31 is a porous ceramic filler supported on titanium dioxide / graphene composite photocatalytic material, with a porosity of 65% and a specific surface area of ​​18 m² / g.

[0041] The beneficial effects of adopting the above-mentioned preferred scheme are as follows: the supported photocatalytic packing is beneficial as a catalyst to reduce the activation energy of the reaction in radionuclide wastewater, thereby improving the efficiency of photodegradation of organic matter in radionuclide wastewater; the aeration and stirring component is beneficial in providing the necessary oxygen in the photocatalytic reaction, thereby generating highly oxidizing active free radicals, and also in generating a stirring-like effect, allowing the organic matter in the radionuclide wastewater to continuously renew the surface of the supported photocatalytic packing, avoiding the adhesion of suspended solids, colloids, and impurities to the surface of the supported photocatalytic packing, thereby maintaining a long-term catalytic effect; the photocatalytic conduit component is beneficial in guiding the radionuclide wastewater to the ultraviolet photocatalytic component for photocatalytic reaction, and the ultraviolet photocatalytic component is beneficial in providing energy for the photocatalytic reaction.

[0042] Preferred, such as Figure 3 and Figure 4 As shown, the aeration and stirring assembly 32 includes an aeration pipe 321 and an aeration pump 322. The aeration pipe 321 is disposed inside the photocatalytic reaction chamber 12 and below the supported photocatalytic packing 31. The aeration pump 322 is connected to the aeration pipe 321.

[0043] It should be noted that, in this embodiment, the aeration pipe 321 is existing technology, and therefore its structure is not described in detail.

[0044] The advantages of adopting the above-mentioned preferred solution are: the aeration pump is conducive to inputting external air into the aeration pipe, and converting the air into tiny bubbles in the radionuclide wastewater through the aeration pipe, so as to achieve the functions of oxygen supply and stirring.

[0045] Preferred, such as Figure 4 and Figure 6As shown, the ultraviolet photocatalytic component 34 includes an ultraviolet lamp tube 341 and a sealing sleeve 342. The sealing sleeve 342 is fixedly sleeved on the ultraviolet lamp tube 341. The photocatalytic conduit component 33 includes an inlet pipe 331, a reaction pipe 332, and an outlet pipe 333. The reaction pipe 332 is sealed on the sealing sleeve 342. One end of the inlet pipe 331 and one end of the outlet pipe 333 are respectively connected to the two ends of the reaction pipe 332. The other end of the inlet pipe 331 is connected to the photocatalytic reaction chamber 12, and the other end of the outlet pipe 333 is connected to the adsorption treatment chamber 13.

[0046] It should be noted that in this embodiment, multiple ultraviolet lamps 341 are circumferentially spaced and arranged along the axial direction of the tank body 1. The multiple ultraviolet lamps 341 are fixed by the sealing sleeve 342. The wavelength of a single ultraviolet lamp is 254nm and the power of a single lamp is 18W. The sealing sleeve 342 is made of quartz material, which is waterproof and corrosion resistant and does not affect the transmission of ultraviolet light.

[0047] The beneficial effects of adopting the above-mentioned preferred scheme are: it facilitates the circumferential irradiation of radionuclide wastewater by ultraviolet light, thereby enabling photocatalytic reactions to degrade the organic matter in the radionuclide wastewater.

[0048] Preferred, such as Figure 5 As shown, the adsorption treatment chamber 13 is divided into a first adsorption treatment chamber 131, a second adsorption treatment chamber 132, and a third adsorption treatment chamber 133 in sequence from the water inlet mechanism 2 to the drainage mechanism 7. The adsorption mechanism 4 includes a zeolite adsorption block 41, a modified bentonite adsorption block 42, and a radionuclide resin adsorption block 43. The zeolite adsorption block 41, the modified bentonite adsorption block 42, and the radionuclide resin adsorption block 43 are respectively disposed inside the first adsorption treatment chamber 131, the second adsorption treatment chamber 132, and the third adsorption treatment chamber 133. The photocatalytic reaction mechanism 3, the first adsorption treatment chamber 131, the second adsorption treatment chamber 132, the third adsorption treatment chamber 133, and the clear water chamber 14 are sequentially connected to each other for the wastewater after photocatalytic treatment to be adsorbed by the zeolite adsorption block 41, the modified bentonite adsorption block 42, and the radionuclide resin adsorption block 43 in sequence.

[0049] It should be noted that, in this embodiment, as Figure 5As shown, a packing support net 134 is installed horizontally in the first adsorption treatment chamber 131, the second adsorption treatment chamber 132, and the third adsorption treatment chamber 133. The packing support net 134 has a mesh structure and is used to place the zeolite adsorption block 41, the modified bentonite adsorption block 42, and the radionuclide resin adsorption block 43 above the packing support net 134 in the first adsorption treatment chamber 131, above the packing support net 134 in the second adsorption treatment chamber 132, and above the packing support net 134 in the third adsorption treatment chamber 133, respectively. At the same time, it can also provide a channel for wastewater to flow sequentially in the first adsorption treatment chamber 131, the second adsorption treatment chamber 132, and the third adsorption treatment chamber 133. like Figure 5 As shown, the space above the zeolite adsorption block 41 in the first adsorption treatment chamber 131 is the upper cavity 1311 of the zeolite adsorption layer, and the space below the packing support net 134 in the first adsorption treatment chamber 131 is the lower cavity 1312 of the zeolite adsorption layer. The modified bentonite adsorption block 42 fills the space above the packing support net 134 in the second adsorption treatment chamber 132, and the space below the packing support net 134 in the second adsorption treatment chamber 132 is the lower cavity 1321 of the modified bentonite adsorption layer. The space above the nuclide resin adsorption block 43 in the third adsorption treatment chamber 133 is the upper cavity 1331 of the nuclide resin adsorption layer, and the space below the packing support net 134 in the third adsorption treatment chamber 133 is the lower cavity 1332 of the nuclide resin adsorption layer. The other end of the liquid outlet pipe 333 is connected to the upper cavity 1311 of the zeolite adsorption layer. The upper cavity 1311, zeolite adsorption block 41, and modified bentonite adsorption block 42 are sealed and separated by a partition baffle 16. The lower cavity 1312 of the zeolite adsorption layer and the lower cavity 1321 of the modified bentonite adsorption layer are connected by a water distribution plate 15. The modified bentonite adsorption block 42 and the upper cavity 1331 of the radionuclide resin adsorption layer are connected by a water distribution plate 15. The modified bentonite adsorption block 42 and the radionuclide resin adsorption block 43, as well as the lower cavity 1321 of the modified bentonite adsorption layer and the lower cavity 1332 of the radionuclide resin adsorption layer, are all sealed and separated by partition baffles 16. The upper cavity 1331 of the radionuclide resin adsorption layer and the clear water cavity 14, as well as the radionuclide resin adsorption block 43 and the clear water cavity 14, are all sealed and separated by partition baffles 16. The lower cavity 1332 of the radionuclide resin adsorption layer and the clear water cavity 14 are connected by a water distribution plate 15. In this way, the following can be achieved: Figure 5 The liquid flow path is indicated by the dashed arrow.

[0050] The advantages of adopting the above-mentioned preferred scheme are: it facilitates the sequential adsorption treatment of wastewater after photocatalytic treatment by zeolite adsorption blocks, modified bentonite adsorption blocks and radionuclide resin adsorption blocks, thereby adsorbing radionuclides in the radionuclide wastewater, so as to finally obtain water that meets the discharge standards.

[0051] Preferred, such as Figure 3 As shown, the drainage mechanism 7 includes a drainage pipe 71, one end of which is connected to the clear water chamber 14. A drainage valve 72 is installed on the drainage pipe 71, and an online radioactive monitoring instrument 73 is installed on the drainage pipe 71 from the drainage valve 72 to the clear water chamber 14.

[0052] It should be noted that in this embodiment, both the drain valve 72 and the online radioactivity monitor 73 are electrically connected to the control structure. The emission standard limit in this embodiment is the emission limit of radionuclides in the national standard "Water Pollutant Discharge Standard for Medical Institutions" (GB18466-2005).

[0053] The advantages of adopting the above-mentioned preferred scheme are: the drain pipe facilitates the discharge of water that has been treated to meet the standards, and the online radioactivity monitoring instrument facilitates real-time monitoring of the radioactivity activity of the treated water, thereby providing a basis for judging the opening and closing of the drain valve.

[0054] Preferred, such as Figures 2 to 4 As shown, it also includes a backwashing mechanism 5, which includes a first backwashing main pipe 502. A backwashing pump 501 and a first regulating valve 504 are installed on the first backwashing main pipe 502. One end of the first backwashing main pipe 502 between the backwashing pump 501 and the first regulating valve 504 is connected to a backwashing connecting pipe 503. A second regulating valve 505 is installed on the backwashing connecting pipe 503. The other end of the backwashing connecting pipe 503 is connected to a backwashing inlet on the tank body 1. The backwashing outlet on the tank body 1 is connected to a third backwashing main pipe 519 for discharging the backwashed liquid.

[0055] It should be noted that in this embodiment, one end of the first backwash main pipe 502 is connected to the clear water chamber 14. Since one end of the drain pipe 71 is also connected to the clear water chamber 14, the clear water chamber 14 is connected to the first port of the three-way pipe 8. One end of the first backwash main pipe 502 and one end of the drain pipe 71 are respectively connected to the other two ports of the three-way pipe 8. The other end of the first backwash main pipe 502 is connected to an external radionuclide wastewater storage device for re-treating substandard purified water. The backwash pump 501, the first regulating valve 504 and the second regulating valve 505 are all electrically connected to the control mechanism. The other end of the backwash connecting pipe 503 is connected to the second backwash main pipe 506. The backwash inlet on the photocatalytic reaction chamber 12, the backwash inlet on the first adsorption treatment chamber 131, the backwash inlet on the second adsorption treatment chamber 132, and the backwash inlet on the third adsorption treatment chamber 133 are respectively connected to one end of the first backwash inlet branch pipe 507, one end of the second backwash inlet branch pipe 508, one end of the third backwash inlet branch pipe 509, and one end of the fourth backwash inlet branch pipe 510. The other end of the first backwash inlet branch pipe 507 and the other end of the second backwash inlet branch pipe 509 are connected to the fourth backwash inlet branch pipe 510. The other ends of pipes 8, 509, and 510 are all connected to the second backwash main pipe 506. The first backwash inlet branch pipe 507, 508, 509, and 510 are respectively equipped with a first backwash regulating valve 511, a second backwash regulating valve 512, a third backwash regulating valve 513, and a fourth backwash regulating valve 514. 514 are all electrically connected to the control mechanism. The backwash outlets on the photocatalytic reaction chamber 12, the first adsorption treatment chamber 131, the second adsorption treatment chamber 132, and the third adsorption treatment chamber 133 are respectively connected to one end of the first backwash outlet branch pipe 515, one end of the second backwash outlet branch pipe 516, one end of the third backwash outlet branch pipe 517, and one end of the fourth backwash outlet branch pipe 518. The other ends of the first backwash outlet branch pipe 515, the second backwash outlet branch pipe 516, and the third backwash outlet branch pipe 518 are connected to the control mechanism. The other end of pipe 517 and the other end of the fourth backwash outlet branch pipe 518 are both connected to the third backwash main pipe 519. The first backwash outlet branch pipe 515, the second backwash outlet branch pipe 516, the third backwash outlet branch pipe 517 and the fourth backwash outlet branch pipe 518 are respectively equipped with a fifth backwash regulating valve 522, a sixth backwash regulating valve 523, a seventh backwash regulating valve 524 and an eighth backwash regulating valve 525, and the fifth backwash regulating valve 522, the sixth backwash regulating valve 523, the seventh backwash regulating valve 524 and the eighth backwash regulating valve 525 are all electrically connected to the control mechanism. One end of the third backwash main pipe 519 is connected to the other end of the fourth backwash outlet branch pipe 518, and the other end of the third backwash main pipe 519 is connected to an external storage device for storing the liquid generated during backwashing. In this embodiment, as Figure 4As shown, the clean water inlet on the clean water chamber 14 is connected to one end of the backwash water inlet pipe 520, and the other end of the backwash water inlet pipe 520 is connected to an external water supply device. A backwash water inlet valve 521 is installed on the backwash water inlet pipe 520, and the backwash water inlet valve 521 is electrically connected to the control mechanism.

[0056] The advantages of adopting the above preferred solution are: it facilitates flushing of the tank during maintenance and repair, and avoids blockage of the tank interior by catalyst packing or adsorbed materials.

[0057] Preferred, such as Figure 1 As shown, it also includes a sewage discharge mechanism 6, which includes a sewage discharge pipe 61. One end of the sewage discharge pipe 61 is connected to the sewage discharge port at the bottom of the tank body 1, and a sewage discharge valve 62 is installed on the sewage discharge pipe 61.

[0058] It should be noted that in this embodiment, the drain valve 62 is electrically connected to the control mechanism; One end of the drain pipe 61 is connected to the drain outlet at the bottom of the water distribution chamber 11, and the other end of the drain pipe 61 is connected to the third backwash main pipe 519.

[0059] The advantages of adopting the above-mentioned preferred solution are: it facilitates the cleaning and treatment of impurities deposited in the water distribution cavity during maintenance.

[0060] The following describes several working modes of this embodiment: During normal operation, the control mechanism closes the first regulating valve 504 and the second regulating valve 505, and opens the inlet valve 22. Medical radionuclide wastewater is pumped from the external radionuclide wastewater storage device into the distribution chamber 11, and then enters the photocatalytic reaction chamber 12 via the distribution plate 15. As the liquid level of the medical radionuclide wastewater continuously rises within the photocatalytic reaction chamber 12, it eventually submerges the supported photocatalytic packing 31, and then flows through the inlet pipe 331 into the reaction tube 332. The medical radionuclide wastewater entering the reaction tube 332 is then irradiated by ultraviolet light generated by the ultraviolet lamp 341, causing the radionuclide wastewater to... After the organic matter is degraded, the medical radionuclide wastewater enters the adsorption treatment chamber 13 through the outlet pipe 333, and is successively adsorbed by the zeolite adsorption block 41 in the first adsorption treatment chamber 131, the modified bentonite adsorption block 42 in the second adsorption treatment chamber 132, and the radionuclide resin adsorption block 43 in the third adsorption treatment chamber 133, thereby removing the radionuclides in the medical radionuclide wastewater. Finally, the purified water enters the clear water chamber 14. If the radioactivity online monitoring instrument 73 detects that the purified water meets the standards, the control mechanism opens the drain valve 72, and the qualified purified water is discharged from the drain pipe 71. If the online radioactivity monitor 73 detects that the purified water does not meet the standards, it indicates that some of the adsorbent material in the supported photocatalytic packing 31 or adsorption mechanism 4 needs to be replaced. Then the control mechanism will close the drain valve 72 and the inlet valve 22 and open the first regulating valve 504. The substandard purified water will be discharged from the first backwash main pipe 502 to the external radionuclide wastewater storage device. After the staff replaces some of the adsorbent material in the supported photocatalytic packing 31 or adsorption mechanism 4, it will be treated again. During backwashing, the control mechanism closes the inlet valve 22, drain valve 62, drain valve 72, and first regulating valve 504, while opening the second regulating valve 505, backwash inlet valve 521, first backwash regulating valve 511, second backwash regulating valve 512, third backwash regulating valve 513, fourth backwash regulating valve 514, fifth backwash regulating valve 522, sixth backwash regulating valve 523, seventh backwash regulating valve 524, and eighth backwash regulating valve 525. The external water supply equipment inputs clean water for backwashing into the clear water chamber 14 through the backwash inlet pipe 520, and from the clear water chamber 14 sequentially through the first backwash main pipe 502 and the backwash connecting pipe 503 into the second backwash main pipe 506, and from the second backwash main pipe 506 simultaneously through… The first backwash inlet branch pipe 507, the second backwash inlet branch pipe 508, the third backwash inlet branch pipe 509, and the fourth backwash inlet branch pipe 510 enter the photocatalytic reaction chamber 12, the first adsorption treatment chamber 131, the second adsorption treatment chamber 132, and the third adsorption treatment chamber 133 for cleaning. The cleaning water then flows from the photocatalytic reaction chamber 12, the first adsorption treatment chamber 131, the second adsorption treatment chamber 132, and the third adsorption treatment chamber 133 through the first backwash outlet branch pipe 515, the second backwash outlet branch pipe 516, the third backwash outlet branch pipe 517, and the fourth backwash outlet branch pipe 518 into the third backwash main pipe 519, and then flows along the third backwash main pipe 519 into an external storage device for storing the liquid generated during backwashing. During the sewage discharge operation, the control mechanism opens the sewage discharge valve 62 and closes all other valves. The impurities deposited in the water distribution chamber 11 then enter the third backwash main pipe 519 through the sewage discharge pipe 61 and enter the external storage device through the third backwash main pipe 519 to store the discharged impurities.

[0061] Compared with the prior art, this embodiment has the following beneficial effects: 1. High efficiency of synergistic treatment: Photocatalytic degradation and selective deep adsorption are highly coupled. The photocatalytic reaction mechanism first degrades organic pollutants in the wastewater to avoid organic matter occupying adsorption sites. The subsequent adsorption mechanism accurately retains radionuclides through three-stage gradient adsorption. Under the synergistic effect, the nuclide removal rate is significantly improved, and the effluent meets the standards stably, which is far higher than that of single treatment processes.

[0062] 2. Compact and airtight structure with strong protection: It adopts an integrated horizontal airtight tank design, which occupies a small area and is suitable for the small spaces of medical institutions. The outside is covered with a radiation protection layer, and the whole process is airtight, eliminating the risk of radioactive radiation leakage and wastewater leakage, and meeting the safety standards for medical radiation treatment.

[0063] 3. High degree of automation and convenient operation: The entire process is automatically controlled by a PLC controller, with online radioactivity monitoring. Unqualified wastewater is automatically returned, eliminating the need for frequent manual operation, reducing the risk of radiation exposure for operators, and simplifying maintenance with a long replacement cycle for the adsorption packing.

[0064] 4. Strong adaptability and good stability: The packing material and process are optimized for the characteristics of low concentration and many accompanying impurities in medical radionuclide wastewater. It can be adapted to the treatment of various common medical radionuclide wastewater such as iodine-131, technetium-99m, and fluorine-18. The radioactivity of the effluent is consistently lower than the national emission standards, meeting the continuous treatment needs of medical institutions.

[0065] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to 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 invention.

[0066] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0067] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0068] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0069] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0070] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A photocatalytic synergistic adsorption device for purifying medical radionuclide wastewater, characterized in that, Includes a tank (1), one end of which is connected to a water inlet mechanism (2) and the other end of which is connected to a drainage mechanism (7). Inside the tank (1), from the water inlet mechanism (2) to the drainage mechanism (7), there are sequentially arranged a photocatalytic reaction mechanism (3) and an adsorption mechanism (4), and the photocatalytic reaction mechanism (3) and the adsorption mechanism (4) are connected.

2. The medical radionuclide wastewater purification device based on photocatalytic synergistic adsorption according to claim 1, characterized in that, The tank (1) is a horizontal cylindrical cavity structure. Its interior, from the water inlet mechanism (2) to the drainage mechanism (7), is sequentially divided into a water distribution chamber (11), a photocatalytic reaction chamber (12), an adsorption treatment chamber (13), and a clear water chamber (14). The water distribution chamber (11) and the photocatalytic reaction chamber (12) are connected by a water distribution plate (15). The photocatalytic reaction chamber (12) and the adsorption treatment chamber (13) are sealed and separated by a partition baffle (16). The upper part between the adsorption treatment chamber (13) and the clear water chamber (14) is sealed and separated by the partition baffle (16). The lower part between the adsorption treatment chamber (13) and the clear water chamber (14) is connected by the water distribution plate (15). The water distribution chamber (11), the photocatalytic reaction chamber (12) and the clear water chamber (14) are respectively connected to the water inlet mechanism (2), the photocatalytic reaction mechanism (3) and the drainage mechanism (7). The adsorption mechanism (4) is disposed inside the adsorption treatment chamber (13).

3. The medical radionuclide wastewater purification device based on photocatalytic synergistic adsorption according to claim 2, characterized in that, The water inlet mechanism (2) includes a water inlet pipe (21), one end of which is connected to the water distribution chamber (11). A water inlet valve (22), a water inlet flow meter (23), and a water inlet pump (24) are installed on the water inlet pipe (21).

4. The medical radionuclide wastewater purification device based on photocatalytic synergistic adsorption according to claim 2, characterized in that, The photocatalytic reaction mechanism (3) includes a supported photocatalytic packing material (31), an aeration and stirring assembly (32), a photocatalytic conduit assembly (33), and an ultraviolet photocatalytic assembly (34). The supported photocatalytic packing material (31) and the aeration and stirring assembly (32) are both located inside the photocatalytic reaction chamber (12). The aeration and stirring assembly (32) is located below the supported photocatalytic packing material (31). The ultraviolet photocatalytic assembly (34) is located inside the photocatalytic conduit assembly (33). The photocatalytic conduit assembly (33) is located outside the tank (1), and one end of it is connected to the photocatalytic reaction chamber (12).

5. The medical radionuclide wastewater purification device based on photocatalytic synergistic adsorption according to claim 4, characterized in that, The aeration and stirring assembly (32) includes an aeration pipe (321) and an aeration pump (322). The aeration pipe (321) is located inside the photocatalytic reaction chamber (12) and below the supported photocatalytic packing material (31). The aeration pump (322) is connected to the aeration pipe (321).

6. The medical radionuclide wastewater purification device based on photocatalytic synergistic adsorption according to claim 4, characterized in that, The ultraviolet photocatalytic component (34) includes an ultraviolet lamp tube (341) and a sealing sleeve (342). The sealing sleeve (342) is fixedly sleeved on the ultraviolet lamp tube (341). The photocatalytic conduit component (33) includes an inlet pipe (331), a reaction tube (332), and an outlet pipe (333). The reaction tube (332) is sealed on the sealing sleeve (342). One end of the inlet pipe (331) and one end of the outlet pipe (333) are respectively connected to the two ends of the reaction tube (332). The other end of the inlet pipe (331) is connected to the photocatalytic reaction chamber (12). The other end of the outlet pipe (333) is connected to the adsorption treatment chamber (13).

7. The medical radionuclide wastewater purification device based on photocatalytic synergistic adsorption according to claim 2, characterized in that, The adsorption treatment chamber (13) is divided into a first adsorption treatment chamber (131), a second adsorption treatment chamber (132), and a third adsorption treatment chamber (133) in sequence from the water inlet mechanism (2) to the drainage mechanism (7). The adsorption mechanism (4) includes a zeolite adsorption block (41), a modified bentonite adsorption block (42), and a radionuclide resin adsorption block (43). The zeolite adsorption block (41), the modified bentonite adsorption block (42), and the radionuclide resin adsorption block (43) are respectively arranged in the first adsorption treatment chamber. The interior of the cavity (131), the second adsorption treatment cavity (132), and the third adsorption treatment cavity (133) are connected in sequence to the photocatalytic reaction mechanism (3), the first adsorption treatment cavity (131), the second adsorption treatment cavity (132), the third adsorption treatment cavity (133), and the clear water cavity (14), which are used to adsorb the wastewater after photocatalytic treatment by the zeolite adsorption block (41), the modified bentonite adsorption block (42), and the radionuclide resin adsorption block (43) in sequence.

8. The medical radionuclide wastewater purification device based on photocatalytic synergistic adsorption according to claim 2, characterized in that, The drainage mechanism (7) includes a drain pipe (71), one end of which is connected to the clear water chamber (14). A drain valve (72) is installed on the drain pipe (71), and an online radioactive monitoring instrument (73) is installed on the drain pipe (71) from the drain valve (72) to the clear water chamber (14).

9. The medical radionuclide wastewater purification device based on photocatalytic synergistic adsorption according to any one of claims 1-8, characterized in that, It also includes a backwashing mechanism (5), which includes a first backwashing main pipe (502), on which a backwashing pump (501) and a first regulating valve (504) are installed. The first backwashing main pipe (502) between the backwashing pump (501) and the first regulating valve (504) is connected to one end of a backwashing connecting pipe (503). A second regulating valve (505) is installed on the backwashing connecting pipe (503). The other end of the backwashing connecting pipe (503) is connected to the backwashing inlet on the tank (1). The backwashing outlet on the tank (1) is connected to a third backwashing main pipe (519) for discharging the backwashed liquid.

10. The medical radionuclide wastewater purification device based on photocatalytic synergistic adsorption according to any one of claims 1-8, characterized in that, It also includes a sewage discharge mechanism (6), which includes a sewage discharge pipe (61), one end of which is connected to the sewage discharge port at the bottom of the tank (1), and a sewage discharge valve (62) is installed on the sewage discharge pipe (61).

Images