Nuclear medicine diagnosis and treatment waste liquid treatment system and application method

Abstract

The invention discloses a nuclear medicine diagnosis and treatment waste liquid treatment system and an application method, and the system comprises a pretreatment unit, a centrifugal solid-liquid separation unit, a membrane solid-liquid separation unit, a deep purification unit, a radiation protection unit, a discharge unit, a flushing unit and a control unit, and also comprises a solid content sub-packaging unit communicated with a solid content discharge port of the pretreatment unit; the solid content volume reduction unit is respectively communicated with slag discharge ports I in the centrifugal solid-liquid separation unit and the membrane solid-liquid separation unit; wherein the discharge end of the solid content volume reduction unit is communicated with the solid content subpackaging unit. According to the nuclear medicine diagnosis and treatment waste liquid treatment system and the application method, two existing large-volume natural decay pools in a hospital are used as a collecting pool and a discharging pool and are used for temporarily storing filtrate and purified liquid and enhancing the buffering capacity of the system respectively, and solid content separated by a pretreatment unit is packaged and transported outwards through a solid content subpackaging unit; and the temporary storage risk and the management cost of the hospital on the solid content are reduced.

Description

Technical Field

[0001] The present invention relates to the field of nuclear medicine diagnosis and treatment waste liquid treatment, and more specifically, to a nuclear medicine diagnosis and treatment waste liquid treatment system and application method. Background Art

[0002] The traditional natural decay method of treating nuclear medical radioactive waste liquid has gradually become inefficient, and the treatment capacity is fixed, which is difficult to expand and difficult to meet the needs of increasing patient visits. Using ion exchange technology to purify nuclear medical radioactive waste liquid can greatly speed up the discharge speed, which is of positive significance for reducing the volume of temporary storage pools and preventing leakage risks.

[0003] The current nuclear medicine diagnosis and treatment waste liquid treatment system is a brand-new design based on the newly built hospital, such as a nuclear medicine diagnosis and treatment waste liquid treatment system and application method with application number 202410429100X. In actual application, it does not fully utilize the hospital's existing large-volume natural decay pool's powerful temporary storage and buffering capacity. At the same time, the solids separated from the nuclear medicine diagnosis and treatment waste liquid still need to be treated by natural decay methods, and the temporary storage and management of the solids still need to be solved. Summary of the invention

[0004] An object of the present invention is to solve at least the above problems and / or disadvantages and to provide at least the advantages which will be described hereinafter.

[0005] In order to achieve these purposes and other advantages of the present invention, a nuclear medicine diagnosis and treatment waste liquid treatment system is provided, including a pretreatment unit matched with a nuclear medicine diagnosis and treatment waste liquid discharge port; a centrifugal solid-liquid separation unit, a membrane solid-liquid separation unit, and a deep purification unit matched with a discharge port I of the pretreatment unit for deep treatment of the pretreated waste liquid; a discharge unit connected to a discharge port II of the deep purification unit; a flushing unit matched with the pretreatment unit, the centrifugal solid-liquid separation unit, and the membrane solid-liquid separation unit; a control unit connected to each unit in communication, and further comprising:

[0006] A solid content dispensing unit connected to the solid content discharge port of the pretreatment unit through pipeline I;

[0007] A solid content reduction unit connected to the centrifugal solid-liquid separation unit and the upper slag discharge port I of the membrane solid-liquid separation unit through pipeline II;

[0008] Wherein, the discharge end of the solid content reduction unit is connected to the solid content packaging unit.

[0009] Preferably, the pre-processing unit is configured to include:

[0010] The hospital's existing natural decay pool A serves as the system's collection pool;

[0011] An inclined screen solid-liquid separator is arranged in the collection tank and cooperates with the raw liquid inlet to achieve preliminary separation of solid and liquid;

[0012] An ultrasonic level meter I is arranged above the collection tank to detect the liquid level in the collection tank;

[0013] A discharge mechanism that cooperates with the solids separation side of the inclined screen solid-liquid separator;

[0014] A feeding pipe group arranged on the unloading mechanism;

[0015] Wherein, the feeding pipe group comprises:

[0016] Feeding pipe I that matches with disinfection module and flushing unit;

[0017] A feeding pipe II matched with the slag discharge port II of the solid content reduction unit;

[0018] The top of the collection tank is provided with a feed pipe matched with the liquid discharge port of the solid content reduction unit;

[0019] A discharge pipe matching the feed inlet of the centrifugal solid-liquid separation unit is arranged at the bottom of the collection tank.

[0020] Preferably, the solid content packaging unit comprises:

[0021] Conveyor belts;

[0022] A plurality of solid content collection tanks are arranged on the conveyor belt and spatially aligned with the position of the discharge pipe, wherein the solid content collection tanks are connected to a cover body via a spring shaft;

[0023] An ultrasonic level meter is provided on one side of the discharge pipe and is used to detect the amount of solid content in the solid content collection tank below the discharge pipe;

[0024] An inclined baffle disposed on one side of the discharge pipe and above the conveyor belt to buckle the cover body onto the solids collection tank through interference force;

[0025] Wherein, a conical sealing platform is provided inside the cover body for sealing the discharge port of the solid content collection tank;

[0026] The cover body and the solid content collection tank are locked by means of a matching spring-type latch.

[0027] Preferably, the solid content reduction unit comprises:

[0028] A buffer tank connected to the centrifugal solid-liquid separation unit and the upper slag discharge port I of the membrane solid-liquid separation unit;

[0029] Ultrasonic level meter II installed above the buffer tank;

[0030] A centrifuge connected to the buffer tank through pipeline III, on which a flushing pipe connected to the flushing unit is provided;

[0031] The separated liquid of the centrifuge is connected to the feed pipe of the collection tank through the liquid outlet, and the slag discharge port III of the centrifuge is connected to the solid content subpackaging unit through the feeding pipe II.

[0032] Preferably, the deep purification unit is configured to include:

[0033] A deep purification module constructed of n serially connected ion exchange columns;

[0034] Two liquid collecting tanks I and II are respectively arranged at the front end and rear end of the deep purification module;

[0035] Among them, the liquid inlet of each ion exchange column is connected to the liquid collecting tank I through the matching pipeline IV, and the liquid outlet of each ion exchange column is connected to the liquid collecting tank II through the matching pipeline V;

[0036] The liquid outlet and liquid inlet of adjacent ion exchange columns are connected through pipeline VI;

[0037] The liquid outlet of the last-stage ion exchange column is connected to the liquid inlet of the first-stage ion exchange column through pipeline VII.

[0038] Preferably, detection channel I is provided on each level of ion exchange column;

[0039] The liquid collecting tank I and the liquid collecting tank II are respectively provided with a detection channel II and a detection channel III which transversely penetrates the tank body to the center;

[0040] Among them, by setting corresponding radiation detectors I, radiation detectors II and radiation detectors III in each detection channel, a radiation detection unit is constructed on the deep purification unit to perform real-time monitoring of radiation before, during and after purification.

[0041] Preferably, the discharge unit is configured to include:

[0042] The original natural decay pool B of the hospital is used as the discharge pool of the system, which is connected to the liquid outlet of the deep purification unit. The discharge outlet of the discharge pool is connected to the liquid inlet of the deep purification unit and the sewage pipe network of the medical institution through corresponding branch pipes and valves;

[0043] Ultrasonic level meter III above the discharge tank;

[0044] Wherein, a sampling port is arranged on the discharge pool.

[0045] Also included is the radiation protection unit, which is configured to include:

[0046] Radiation protection layer I provided on the outer or inner wall of the solids collection tank;

[0047] The radiation protection layer II is arranged on the outer wall or the inner wall of the ion exchange column.

[0048] An application method of the nuclear medicine diagnosis and treatment waste liquid treatment system comprises:

[0049] S1. Nuclear medicine radioactive waste liquid flows through the inclined screen solid-liquid separator in real time. The filtrate after solid-liquid separation by the inclined screen separator enters the collection pool for temporary storage, and the solids enter the solids filling unit through the unloading mechanism;

[0050] S2, ultrasonic level meter I detects the liquid level of the collection tank in real time and feeds it back to the host computer, so that when the collection tank reaches a high liquid level, each downstream unit is started to work;

[0051] The ultrasonic level meter detects the material level of the solid content collection tank under the discharge pipe in real time and feeds back to the host computer. When the solid content collection tank is at a high level, the valve on the discharge pipe is closed and the conveyor belt is controlled to move forward until the empty solid content collection tank reaches the loading position under the discharge pipe.

[0052] S3, the filtrate in the collection tank passes through the centrifugal solid-liquid separation unit and the membrane solid-liquid separation unit in sequence, and the solid content goes to the solid content reduction unit, the separation liquid of the solid content reduction unit enters the collection tank, and the separation liquid of the membrane solid-liquid separation unit enters the deep purification unit;

[0053] S4, the ultrasonic level meter detects the liquid level of the buffer tank in the solid content reduction unit in real time and feeds back to the host computer to start the centrifuge of the solid content reduction unit after the buffer tank reaches a high liquid level;

[0054] The radiation detectors at various positions of the deep purification unit detect the radioactivity of the liquid in the liquid collecting tank I and the liquid collecting tank II and the radioactivity on the ion exchange column in real time, and feed back to the host computer to evaluate the dynamic performance of the purification unit and the ion exchange column to determine whether to optimize the number of ion exchange columns or replace the ion exchange columns;

[0055] S5. Ultrasonic level meter III detects the liquid level of the discharge pool in real time and feeds back to the host computer. When the discharge pool reaches a high liquid level, the upstream centrifugal solid-liquid separation unit, membrane solid-liquid separation unit and solid content reduction unit are stopped, and the radioactivity test of the third-party agency is started through the sampling port. If qualified, the purified liquid will be discharged into the sewage network. Otherwise, the purified liquid in the discharge pool will be returned to the deep purification unit for purification again until it is discharged as qualified.

[0056] Preferably, when the equipment needs to be cleaned for maintenance, the host computer starts the flushing unit to clean the inside of each unit, and the flushing water discharges the purified liquid in the pool.

[0057] The present invention includes at least the following beneficial effects: Compared with the prior art, the present invention utilizes the two existing large-volume natural decay pools in the hospital as a collection pool and a discharge pool, respectively, for temporarily storing filtrate and purified liquid, thereby enhancing the system's buffering capacity. That is, the hospital no longer needs to set up a natural decay pool to decay solids, thereby enabling the hospital to achieve continuous treatment of nuclear medicine diagnosis and treatment waste liquid, while minimizing changes to the original equipment, with better cost controllability. The solids separated by the pretreatment unit are packaged and transported out through a solids packaging unit, thereby reducing the hospital's risk of temporary storage of solids and management costs.

[0058] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 This is a schematic diagram of the composition of the nuclear medicine diagnosis and treatment waste liquid treatment system of the present invention;

[0060] Figure 2 It is a structural schematic diagram of the pretreatment unit of the present invention;

[0061] Figure 3 It is a structural schematic diagram of the solid content packaging unit of the present invention;

[0062] Figure 4 This is a schematic diagram of the automatic cover closing process of the solid content collection tank of the present invention;

[0063] Figure 5 It is a structural schematic diagram of the solid content reduction unit of the present invention;

[0064] Figure 6 It is a structural schematic diagram of the deep purification unit of the present invention;

[0065] Figure 7 It is a schematic diagram of the structure of the discharge unit of the present invention;

[0066] Figure 8 This is a working diagram of the nuclear medicine diagnosis and treatment waste liquid treatment system of the present invention;

[0067] Fig. 9 This is a SEM image of the Schiff base modified ionic framework material prepared in Example 1 of the present invention;

[0068] Fig.10 This is a time gradient diagram of the adsorption of lutetium ions by the Schiff base modified ionic framework material prepared in Example 1 of the present invention;

[0069] Fig.11 This is a concentration gradient diagram of lutetium ions adsorbed by the Schiff base modified ionic framework material prepared in Example 1 of the present invention. DETAILED DESCRIPTION

[0070] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0071] It should be understood that the terms such as “having”, “including” and “comprising” used herein do not exclude the existence or addition of one or more other elements or combinations thereof.

[0072] It should be noted that in the description of the present invention, the orientation or positional relationship indicated by the term is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "Ⅰ" and "Ⅱ" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0073] In the description of the present invention, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installed", "provided with", "mounted / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be a direct connection or an indirect connection through an intermediate medium. It can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0074] 1. System composition

[0075] The nuclear medicine diagnosis and treatment waste liquid treatment system mainly includes a pretreatment unit 1, a solid content packaging unit 2, a centrifugal solid-liquid separation unit 3, a membrane solid-liquid separation unit 4, a solid content volume reduction unit 5, a deep purification unit 6, a discharge unit 7, a flushing unit 8, a radiation protection unit 9, a detection unit 10, a video monitoring unit 11 and a control unit 12. Among them, the low-level waste liquid disposal site is a place located outside the medical institution that can accept and treat low-level waste. The composition and principle of the nuclear medicine diagnosis and treatment waste liquid treatment system are as follows: Figure 1 shown.

[0076] 1. Preprocessing unit

[0077] like Figure 2As shown, the pretreatment unit includes: a collection pool 14 (which is the secondary use of the existing hospital decay pool), a disinfection module 15, an ultrasonic level meter 16, a valve I 17, a valve II 18, a cutting pump 19, and an inclined screen solid-liquid separator 20 composed of a comb-tooth inclined screen and a vibration motor. The pretreatment unit is connected to the nuclear medicine diagnosis and treatment waste liquid discharge outlet, the solid content packaging unit, the centrifugal solid-liquid separation unit, the solid content reduction unit and the flushing unit pipeline and the hospital sewage network to achieve primary solid-liquid separation of nuclear medicine diagnosis and treatment waste liquid, collect / temporarily store the filtrate generated by the primary separation, and disinfect the separated solid content.

[0078] The collection tank 14 mainly utilizes the existing large-volume natural decay tank in the hospital. Its main function is to serve as the main body of the pretreatment unit and collect and temporarily store the primary separation liquid. The comb-tooth inclined screen and the vibration motor form the primary solid-liquid separator 20. The raw liquid flows through the comb-tooth inclined screen from the feed pipe 21 with the lead layer, and the larger particles of solids slide from the screen surface to the discharge mechanism 22 (the discharge mechanism is a pipeline structure, and the valve II 18 is set on the discharge mechanism 22). The filtrate enters the collection tank 14, and the vibration motor is started at a fixed time to prevent the solids from adhering to the screen surface. The separation liquid generated by the solid content reduction unit enters the collection tank 14 from the feed pipe 23 at the top of the collection tank 14 for temporary storage or collection, and the solids are introduced into the discharge mechanism 22 through the feeding pipe II 24. The flushing water regularly flushes the discharge mechanism 22 through the feeding pipe I 25 integrated with the disinfection module. The disinfection module 15 sends the disinfectant to the discharge mechanism 22 through the feeding pipe I 25 in real time to disinfect and sterilize the solids. The ultrasonic level meter Ⅰ16 detects the liquid level of the collection tank 14 in real time and feeds back to the control unit (i.e., the host computer) so that when the predetermined high liquid level is reached, the centrifugal solid-liquid separation unit, membrane solid-liquid separation unit, solid content reduction unit, and deep purification unit are started, and when the liquid level is low, these units are stopped.

[0079] 2. Solids packaging unit

[0080] like Figure 3As shown, the solid content sub-packaging unit includes: a conveyor belt 27, a plurality of solid content collection tanks 28 arranged on the conveyor belt 27, and an ultrasonic level meter 29 arranged on the unloading mechanism 22. The main function of the solid content sub-packaging unit is to automatically can and temporarily store the solid content coming out of the unloading mechanism 22, in preparation for transporting it to a low-level waste disposal site. In the actual application process, the room where the decay pool was originally set up in the hospital can be fully utilized, and the unloading mechanism 22 is directly set near the collection pool 14, and the conveyor belt is set below the unloading mechanism 22. Because a valve is set on the unloading mechanism 22 and the volume of each solid content collection tank 28 is limited, the long-term exposure of the solid content in the solid content collection tank 28 is reduced, and no additional shielding is required. However, if the application scenario is strong radiation or low emission, a sealed filling chamber 26 with an external or internal lead shielding layer can be adaptively set on the outside of the solid content filling unit (on which an inlet and an outlet matching the two ends of the conveyor belt are arranged, and the inlet and the outlet are spatially staggered from the position of the unloading mechanism 22, such as the conveyor belt is arranged in a maze-like manner to prevent the leakage of radioactive substances from affecting the environment and human body), and the unloading mechanism 22 is connected to the inside of the sealed filling chamber 26 to discharge the solids into the solid content collection tank 28.

[0081] The solid content collection tank 28 is a sealable tank made of stainless steel and lead shielding layer material. The solid content collection tank 28 is driven by the conveyor belt 27 to move in a directional manner, and the ultrasonic level meter 29 detects the material level in the solid content collection tank 28 below the discharge port in real time and feeds back to the control unit. When the material level is high, it means that the current solid content collection tank 28 is full, then the valve II 18 is closed, the cover 30 of the solid content collection tank 28 is sealed, and the conveyor belt is started until the next empty solid content collection tank 28 arrives below the discharge mechanism 22.

[0082] In actual application, since the solids have strong radioactivity, it is necessary to close the lid automatically after the solids collection tank 28 is full. Figure 4 As shown. The cover of the solid content collection tank 28 is connected to the tank body through a spring shaft 31. In the open state, the inner sealing cover 30 is kept upright by the action of the spring. After being acted upon by the back force of the inclined baffle 32 in the sealed filling chamber, the cover 30 can tilt forward. When it is horizontal, it is locked by a spring latch 33 provided on the solid content collection tank 28 (because the spring shaft 31 and the spring latch 33 are both prior arts, their structure and connection method will not be described in detail here). The conveyor belt 27 drives the solid content collection tank 28 to move forward, and the inclined baffle 32 that is fixed at a certain height can give the inner sealing cover a back force. As long as the minimum height of the baffle is set appropriately, the inner sealing cover can be closed and locked.

[0083] In actual application, a conical sealing platform 35 is provided on the inner side of the cover body, which matches the opening 34 of the solid content collection tank 28, so as to ensure the sealing inside the solid content collection tank 28. However, the fermentation of solid content will produce gas, so at least one pressure relief hole 36 is provided on the outer edge of the opening of the sealed solid content collection tank. A one-way valve can be provided in the pressure relief hole 33 to ensure that the pressure relief hole 33 is not conducted to the outside when the air pressure is within a certain range. When the air pressure exceeds the rated value, the pressure relief hole 33 is conducted to release air, so as to prevent the high pressure from damaging the structure of the solid content collection tank.

[0084] 3. Centrifugal solid-liquid separation unit

[0085] The liquid inlet of the centrifugal solid-liquid separation unit is connected to the bottom pipeline of the collection tank, and is composed of a centrifuge I and a water quality detector I. The main function of the centrifugal solid-liquid separation unit is to use a centrifuge to remove smaller particles of solids in the waste liquid after the primary solid-liquid separation in the pretreatment unit.

[0086] The waste liquid after the primary solid-liquid separation in the pretreatment unit is separated by the centrifuge for the second solid-liquid separation. The solids enter the solid content reduction unit by slag discharge, and the separated liquid enters the membrane separation unit. The water quality detector 1 detects the water quality parameters of the separated liquid in real time and feeds back to the control unit to provide a basis for quality control.

[0087] 4. Membrane solid-liquid separation unit

[0088] The liquid inlet of the membrane solid-liquid separation unit is connected to the liquid outlet pipeline of the centrifuge unit, and is composed of a membrane and a water quality detector II. The main function of the membrane solid-liquid separation unit is to use membrane filtration to remove tiny solid particles in the waste liquid after the centrifuge solid-liquid separation.

[0089] The separated liquid obtained by the centrifuge is separated into solid and liquid for the third time through the membrane separation unit, the solids enter the solid content reduction unit by slag discharge, and the separated liquid enters the purification unit. The water quality detector 2 detects the water quality parameters of the separated liquid in real time and feeds back to the control unit to provide a basis for quality control.

[0090] 5. Solid content reduction unit

[0091] The liquid inlet of the solid content reduction unit is connected to the corresponding slag outlet I36 of the centrifugal solid-liquid separation unit and the membrane solid-liquid separation unit respectively. The solid content reduction unit includes a buffer tank 37, a centrifuge II39 connected to the buffer tank through a pipeline III38, a flushing pipe 40 connected to the flushing unit, an ultrasonic level meter II41 arranged on the buffer tank 37, and a valve III42 arranged on the pipeline III38, such as Figure 5 The function of the solid content reduction unit is mainly to use a centrifuge to perform solid-liquid separation again on the slag discharged from the centrifugal solid-liquid separation unit and the membrane solid-liquid separation unit to achieve the purpose of solid content reduction.

[0092] The buffer tank is a sealable tank made of stainless steel and lead shielding layer materials. The solids produced by the centrifugal solid-liquid separation unit and the membrane solid-liquid separation unit first enter the buffer tank. The ultrasonic level meter 2 detects the liquid level of the buffer tank in real time and feeds back to the control unit. The high liquid level opens the valve 3 and the centrifuge to work, and the solids are further separated from the solid and liquid. The separated liquid returns to the collection tank of the pretreatment unit, and the solids are sent to the solid content packaging unit through the unloading mechanism 22 of the pretreatment unit. The low liquid level closes the valve 3 and the centrifuge.

[0093] 6. Deep purification unit

[0094] The liquid inlet of the deep purification unit is connected to the liquid outlet pipeline of the membrane separation unit and the purification unit, such as Figure 6 As shown, the deep purification unit is composed of n (n>1) serial ion exchange columns 43, n+2 radiation detector hole groups and two liquid collecting tanks 44 with completely identical structural volumes. The main function of the deep purification unit is to use the ion exchange columns to perform ion exchange on the nuclides in the clear liquid after three solid-liquid separations to achieve the purpose of extracting and removing the nuclides in the clear liquid.

[0095] The liquid collecting tank is a sealable tank made of stainless steel and lead shielding material. The radiation detector hole Ⅰ45 runs horizontally through the tank to the center, which is used to place the n+1 and n+2 radiation detectors. The n+1 and n+2 radiation detectors detect the radioactive parameters Ln+1 and Ln+2 of the separation liquid before and after purification in real time, and feed back to the control unit to provide a basis for evaluating the purification capacity of the deep purification unit for radioactive wastewater.

[0096] The n (n>1) serial ion exchange columns are all sealable columns made of stainless steel and lead shielding materials, and the interior is filled with ion exchange fibers or resins as needed. In actual applications, the liquid inlet of each ion exchange column is connected to the liquid collecting tank I through the matching pipeline IV, and the liquid outlet of each ion exchange column is connected to the liquid collecting tank II through the matching pipeline V; the liquid outlet and liquid inlet of the adjacent ion exchange columns are connected through pipeline VI; the liquid outlet of the last stage ion exchange column is connected to the liquid inlet of the front stage ion exchange column through pipeline VII, and corresponding valves can be set on each pipeline to control the working mode (i.e. series or parallel working mode) and working state (whether it is in a non-working state, so as to facilitate replacement or maintenance) of each ion exchange column through the valve. There is a radiation detector hole II46 on the upper part of each ion exchange column, which runs horizontally through the column to the center, and is used to place the 1st to nth radiation detectors. The 1st to nth radiation detectors detect the corresponding radioactive parameters L1 to Ln on the upper part of the ion exchange column in real time and feed them back to the control unit. A radiation detection unit is constructed on the deep purification unit to monitor the radiation before, during and after purification in real time, providing a basis for evaluating the dynamic performance of the ion exchange column.

[0097] Assuming that the removal rate of the purification device for nuclides is represented by K = Ln + 1 / Ln + 2, K0 is the threshold value of the minimum purification capacity. The purification capacity is evaluated according to the measurement values ​​of the n+1th and n+2th radiation detectors, and the dynamic performance table of the deep purification unit is obtained as shown in Table 1.

[0098] Table 1

[0099]

[0100] Assuming that the radioactive parameter measurement value of the upper part of the first ion exchange column is L1, and the measurement values ​​at m evenly distributed time points are L11, L12...L1m, if these m measurement values ​​maintain a large value and tend to be consistent, it can be said that the lipid exchange capacity of the fiber or resin at the upper part of the ion exchange has reached saturation. Because the inlet of the ion exchange column is at the bottom and the outlet is at the top, that is to say, the fiber or resin at the bottom of the ion exchange column first contacts the strongest separation liquid, and the ion exchange reaction is the strongest. As the height increases, the ion exchange reaction gradually weakens. Therefore, if the exchange capacity of the fiber or resin at the upper part of the ion exchange is saturated, the fiber or resin capacity of the entire ion exchange column is saturated. Therefore, by recording and comparing the measurement values ​​of an ion exchange column in a time period, the exchange capacity of the fiber or resin in the corresponding ion exchange column can be evaluated, providing a basis for replacing the fiber or resin in the ion exchange column. The ion exchange capacity is evaluated according to the m measurement values ​​of the 1st to nth radiation detectors in a time period, and the dynamic performance table of the ion exchange column as shown in Table 2 is obtained.

[0101] Table 2

[0102]

[0103]

[0104] 7. Emission unit

[0105] The liquid inlet of the discharge unit is connected to the liquid outlet pipeline of the deep purification unit, and the discharge port is connected to the liquid inlet of the deep purification unit and the sewage pipe network pipeline of the medical institution respectively, such as Figure 7 As shown, it includes a discharge pool 47 (which also utilizes the decay pool of an existing hospital), an ultrasonic level meter III 48, a lift pump 49, a sampling port 50, and valves VI 51, V 52, and VI 53. Its main function is to receive and temporarily store the purified liquid produced by the deep purification unit and discharge it regularly.

[0106] Open valve VI51, and the purified liquid produced by the deep purification unit is transferred to the discharge pool through the lifting pump. The ultrasonic level meter III48 detects the liquid level in the discharge pool in real time and feeds back to the control unit. When the liquid level is high, close valve VI51, take samples through the sampling port 50, and send them to a third-party testing agency for radioactivity testing. If the test is qualified, open valve V52 to discharge the temporarily stored purified liquid to the hospital's sewage network. Otherwise, open valve VI51 and the purified liquid returns to the deep purification unit for purification again until it is qualified.

[0107] 8. Flushing unit

[0108] The flushing unit includes a pretreatment unit flushing module, a centrifugal solid-liquid separation unit flushing module, a membrane solid-liquid separation unit flushing module and a solid content reduction unit flushing module. The flushing water comes from the purified waste liquid temporarily stored in the discharge unit. The flushing unit is used to clean and discharge the solids in the tank body or equipment of the pretreatment unit, the centrifugal solid-liquid separation unit, the membrane solid-liquid separation unit and the solid content reduction unit.

[0109] 9. Radiation protection unit

[0110] The radiation protection unit consists of a lead layer wrapped around the surface of the solid collection tank, liquid collection tank, ion exchange column and buffer tank. The thickness of the lead layer is determined by the activity of the waste liquid in these units. The function of the radiation protection unit is to shield the radiation generated by the nuclear medicine diagnosis and treatment waste liquid to prevent radiation from harming personnel entering the site, while the radiation detector removes the radiation background.

[0111] 10. Detection unit

[0112] The detection unit includes a liquid level detection module, a water quality detection module and a radioactivity detection module. The function of the detection unit is to collect and display the process parameters of the system and feed them back to the control unit to provide a basis for quality control and performance evaluation.

[0113] 11. Video surveillance unit

[0114] The video monitoring unit includes multiple cameras installed at the system work site. The function of the video monitoring unit is to collect on-site video signals of each unit of the nuclear medicine diagnosis and treatment waste liquid treatment system.

[0115] 12. Control unit

[0116] The control unit consists of an input module, a communication module, a control module, an execution module, a display module and an alarm module. The input module receives the operator's instructions and the test results of the liquid level, water quality parameters and radioactivity of the detection unit and the video signal of the video monitoring unit as the given value and feedback value of the control unit. The communication module transmits the given value and feedback value to the control module. The control module receives the given value and feedback value and outputs the control signal to the execution module through the communication membrane. The execution module consists of all the valves, pumps and vibrators of each unit. The execution module receives the control signal to adjust the flow and liquid level, and start and stop (close) the equipment and valves of each unit. The display module is mainly used for real-time display of operator instructions, on-site images, process parameters and work processes. During the operation of the system, the alarm module generates sound and light signals when abnormalities occur in various parameters, prompting the operator to deal with them in time.

[0117] 2. Workflow

[0118] like Figure 8 As shown in the figure, the workflow of the nuclear medicine diagnosis and treatment waste liquid treatment system includes:

[0119] Step 1: Nuclear medicine radioactive waste liquid flows through the inclined screen solid-liquid separator in real time, and the filtrate after solid-liquid separation by the inclined screen separator enters the collection pool for temporary storage. The solid content enters the solid content collection tank through the discharge port for packaging and sterilization.

[0120] Step 2: Real-time detection of the material level of the solid collection tank and the liquid level of the collection pool and feedback to the control system. When the solid collection tank is at a high material level, the conveyor belt moves forward until the empty solid collection tank reaches the loading position below the discharge port, and continues to load. When the collection pool reaches a high liquid level, the centrifugal solid-liquid separation unit, membrane solid-liquid separation unit, solid volume reduction unit, deep purification unit and discharge unit are started. When the liquid level is low, these units are stopped.

[0121] Step 3: After the filtrate from the collection tank passes through the centrifuge and membrane solid-liquid separation in turn, the solids go to the solid content reduction unit, and the separated liquid enters the ion exchange column. The water quality detector monitors the parameters of the separated liquid in real time, providing a basis for the parameter changes during the solid-liquid separation operation.

[0122] Step 4: Real-time detection of the liquid level of the buffer tank of the solid content reduction unit, and starting the centrifuge of the solid content reduction unit when the liquid level is high and stopping the centrifuge when the liquid level is low.

[0123] Step 5: The separated liquid is extracted and removed by the ion exchange column and enters the purification unit. The radioactivity of the liquid in the liquid collection tank 1 and the liquid collection tank 2 and the radioactivity on the ion exchange column are detected in real time to evaluate the dynamic performance of the purification unit and the ion exchange column, and provide a basis for optimizing the number of ion exchange columns and replacing ion exchange columns.

[0124] Step 7: The discharge pool collects and temporarily stores the purified liquid produced by the deep purification unit, and detects the liquid level of the discharge pool in real time. When the liquid level is high, stop receiving the purified liquid and start the radioactivity test of the third-party agency. If qualified, the purified liquid will be discharged to the sewage network of the medical institution, otherwise the purified liquid will return to the deep purification unit for purification again until it is discharged.

[0125] Step 8: When the equipment needs to be cleaned for maintenance, the control system starts the flushing unit, which can clean the inside of all equipment, pools and pipes. The flushing water is the purified liquid of the discharge unit.

[0126] Furthermore, the ion exchange column of the present invention uses a Schiff base modified ion framework material as a deep purification material for medical wastewater containing lutetium nuclei;

[0127] The structural formula of the Schiff base modified ionic framework material is as follows:

[0128]

[0129] Wherein M is one or a combination of metal cations selected from sodium, potassium, magnesium, calcium, aluminum and iron, and n is an integer of 1 to 3.

[0130] Example 1

[0131] This embodiment provides a method for deep purification of lutetium-containing medical wastewater using a Schiff base modified ionic framework material, comprising the following steps:

[0132] Step 1: preparing the Schiff base modified ionic framework material Lys-Na@MF, specifically comprising:

[0133] S1, cutting the original sponge into a cuboid with a length of 10 mm and a width and thickness of 5 mm to obtain an unmodified sponge base;

[0134] S2, soak the sponge base in anhydrous ethanol, then put it into an ultrasonic oscillator for 20 minutes, repeat this process 3 times to wash away possible impurities, and finally dry it in an oven at 50°C;

[0135] S3, synthesizing a functionalized reagent at room temperature; wherein the functionalized reagent is prepared by using 14 mL of ethanol as a solvent, adding 1 mmol of tris(2-aminoethyl)amine and 2.5 mmol of terephthalaldehyde to react, and the reaction time is 10 min; then taking 5 mL of the reacted reagent into a reactor, adding 1 mL of ethyl acetate and 1 mL of dichloromethane, and standing at room temperature for 10 min, then adding 0.2 mmol of lysine-sodium ion liquid, placing it on an oscillator, setting the speed of the oscillator to 250 r / min, and the oscillation time to 10 min, so that it is fully dissolved in the reagent, and then standing at room temperature for 10 min to obtain a functionalized reagent;

[0136] S4. Load the sponge substrate with functional reagents. Place 15 mg of the cleaned and dried sponge substrate into 10 mL of the functional reagent and allow to react for 15 min at room temperature. Shake the sponge every 3 min during the reaction to obtain a Schiff base-modified sponge. Then take out the sponge and dry it in an oven at 60 ° C. Turn it over every 5 min during the drying process to obtain a Schiff base-modified ionic framework material Lys-Na@MF. The SEM image of the Schiff base-modified ionic framework material prepared in this embodiment is shown in FIG. Fig. 9 shown.

[0137] Step 2: Place 20 g of the dried Schiff base modified ion framework material into a glass chromatography column, and use anhydrous ethanol to completely permeate the glass chromatography column containing the Schiff base modified ion framework material until the anhydrous ethanol completely soaks the Schiff base modified ion framework material;

[0138] Step 3: Adjust the peristaltic pump flow rate to 2 mL / min, pass the lutetium nucleus-containing medical wastewater into a glass chromatography column with an inner diameter of 5 cm and an effective height of 20 cm, collect the wastewater, and complete the deep purification of the lutetium nucleus-containing medical wastewater. In this embodiment, the lutetium concentration in the initial nuclear medical wastewater is 10 mg / L, the volume of the nuclear medical wastewater is 1 L, and the lutetium concentration after purification is 0.04 mg / L.

[0139] like Fig.10 As shown, at room temperature (25°C), 15 mg of the modified Schiff base ion framework material prepared in this embodiment was added to 25 mL of lutetium solution with a lutetium concentration of 100 mg / L, and the pH of the lutetium solution was 6.7. It can be seen from the curve of the adsorption amount changing with time that the modified Schiff base ion framework material has a fast adsorption rate for lutetium and can reach equilibrium in about 10 minutes.

[0140] like Fig.11 As shown, at room temperature (25°C), 15 mg of the modified Schiff base ion framework material prepared in this embodiment was added to 25 mL of lutetium solution of different concentrations, the pH of the lutetium solution was 6.7, and the adsorption time was 6 hours. It can be seen from the curve of the adsorption amount changing with the lutetium ion concentration in the solution that the modified Schiff base ion framework material still has good adsorption performance for high concentration lutetium ion solution.

[0141] The above solution is only an illustration of a preferred embodiment, but is not limited thereto. When implementing the present invention, appropriate replacement and / or modification can be performed according to user needs.

[0142] The number of devices and processing scales described here are used to simplify the description of the present invention. Applications, modifications and variations of the present invention will be obvious to those skilled in the art.

[0143] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and the embodiments. It can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily realized. Therefore, without departing from the general concept defined by the claims and equivalent scope, the present invention is not limited to the specific details and the illustrations shown and described here.

Claims

1. A nuclear medicine diagnosis and treatment waste liquid treatment system, comprising a pretreatment unit matched with a nuclear medicine diagnosis and treatment waste liquid discharge port; a centrifugal solid-liquid separation unit, a membrane solid-liquid separation unit, and a deep purification unit matched with a discharge port I of the pretreatment unit for deep treatment of the pretreated waste liquid; a discharge unit connected to a discharge port II of the deep purification unit; a flushing unit matched with the pretreatment unit, the centrifugal solid-liquid separation unit, and the membrane solid-liquid separation unit; and a control unit connected to each unit in communication, characterized in that: Also includes: A solid content dispensing unit connected to the solid content discharge port of the pretreatment unit through pipeline I; A solid content reduction unit connected to the centrifugal solid-liquid separation unit and the upper slag discharge port I of the membrane solid-liquid separation unit through pipeline II; Wherein, the discharge end of the solid content reduction unit is connected to the solid content packaging unit.

2. The nuclear medicine diagnosis and treatment waste liquid treatment system according to claim 1, characterized in that: The pre-processing unit is configured to include: The hospital's existing natural decay pool A serves as the system's collection pool; An inclined screen solid-liquid separator is arranged in the collection tank and cooperates with the raw liquid inlet to achieve preliminary separation of solid and liquid; An ultrasonic level meter I is arranged above the collection tank to detect the liquid level in the collection tank; A discharge mechanism that cooperates with the solids separation side of the inclined screen solid-liquid separator; A feeding pipe group arranged on the unloading mechanism; Wherein, the feeding pipe group comprises: Feeding pipe I that matches with disinfection module and flushing unit; A feeding pipe II matched with the slag discharge port II of the solid content reduction unit; The top of the collection tank is provided with a feed pipe matched with the liquid discharge port of the solid content reduction unit; A discharge pipe matching the feed inlet of the centrifugal solid-liquid separation unit is arranged at the bottom of the collection tank.

3. The nuclear medicine diagnosis and treatment waste liquid treatment system according to claim 1, characterized in that: The solid content packaging unit comprises: Conveyor belts; A plurality of solid content collection tanks are arranged on the conveyor belt and spatially aligned with the position of the discharge pipe, wherein the solid content collection tanks are connected to a cover body via a spring shaft; An ultrasonic level meter is provided on one side of the discharge pipe and is used to detect the amount of solid content in the solid content collection tank below the discharge pipe; An inclined baffle disposed on one side of the discharge pipe and above the conveyor belt to buckle the cover body onto the solids collection tank through interference force; Wherein, a conical sealing platform is provided inside the cover body for sealing the discharge port of the solid content collection tank; The cover body and the solid content collection tank are locked by means of a matching spring-type latch.

4. The nuclear medicine diagnosis and treatment waste liquid treatment system according to claim 1, characterized in that: The solid content reduction unit comprises: A buffer tank connected to the centrifugal solid-liquid separation unit and the upper slag discharge port I of the membrane solid-liquid separation unit; Ultrasonic level meter II installed above the buffer tank; A centrifuge connected to the buffer tank through pipeline III, on which a flushing pipe connected to the flushing unit is provided; The separated liquid of the centrifuge is connected to the feed pipe of the collection tank through the liquid outlet, and the slag discharge port III of the centrifuge is connected to the solid content subpackaging unit through the feeding pipe II.

5. The nuclear medicine diagnosis and treatment waste liquid treatment system according to claim 1, characterized in that: The deep purification unit is configured to include: A deep purification module constructed of n serially connected ion exchange columns; Two liquid collecting tanks I and II are respectively arranged at the front end and rear end of the deep purification module; The liquid inlet of each ion exchange column is connected to the liquid collecting tank I through a matching pipeline IV, and the liquid outlet of each ion exchange column is connected to the liquid collecting tank II through a matching pipeline V. The liquid outlet and liquid inlet of adjacent ion exchange columns are connected through pipeline VI; The liquid outlet of the last-stage ion exchange column is connected to the liquid inlet of the first-stage ion exchange column through pipeline VII.

6. The nuclear medicine diagnosis and treatment waste liquid treatment system according to claim 5, characterized in that: Detection channel I is set on each level of ion exchange column; The liquid collecting tank I and the liquid collecting tank II are respectively provided with a detection channel II and a detection channel III which transversely penetrates the tank body to the center; Among them, by setting corresponding radiation detectors I, radiation detectors II and radiation detectors III in each detection channel, a radiation detection unit is constructed on the deep purification unit to perform real-time monitoring of radiation before, during and after purification.

7. The nuclear medicine diagnosis and treatment waste liquid treatment system according to claim 1, characterized in that: The discharge unit is configured to include: The original natural decay pool B of the hospital is used as the discharge pool of the system, which is connected to the liquid outlet of the deep purification unit. The discharge outlet of the discharge pool is connected to the liquid inlet of the deep purification unit and the sewage pipe network of the medical institution through corresponding branch pipes and valves; Ultrasonic level meter III above the discharge tank; Wherein, a sampling port is arranged on the discharge pool.

8. The nuclear medicine diagnosis and treatment waste liquid treatment system according to claim 1, characterized in that: Also included is the radiation protection unit, which is configured to include: Radiation protection layer I provided on the outer wall or inner wall of the solids collection tank; The radiation protection layer II is arranged on the outer wall or the inner wall of the ion exchange column.

9. An application method of the nuclear medicine diagnosis and treatment waste liquid treatment system according to any one of claims 1 to 8, characterized in that: include: S1. Nuclear medicine radioactive waste liquid flows through the inclined screen solid-liquid separator in real time. The filtrate after solid-liquid separation by the inclined screen separator enters the collection pool for temporary storage, and the solids enter the solids filling unit through the unloading mechanism; S2, ultrasonic level meter I detects the liquid level of the collection tank in real time and feeds it back to the host computer, so that when the collection tank reaches a high liquid level, each downstream unit is started to work; The ultrasonic level meter detects the material level of the solid content collection tank under the discharge pipe in real time and feeds back to the host computer. When the solid content collection tank is at a high level, the valve on the discharge pipe is closed and the conveyor belt is controlled to move forward until the empty solid content collection tank reaches the loading position under the discharge pipe. S3, the filtrate in the collection tank passes through the centrifugal solid-liquid separation unit and the membrane solid-liquid separation unit in sequence, and the solid content goes to the solid content reduction unit, the separation liquid of the solid content reduction unit enters the collection tank, and the separation liquid of the membrane solid-liquid separation unit enters the deep purification unit; S4, the ultrasonic level meter detects the liquid level of the buffer tank in the solid content reduction unit in real time and feeds back to the host computer to start the centrifuge of the solid content reduction unit after the buffer tank reaches a high liquid level; The radiation detectors at various positions of the deep purification unit detect the radioactivity of the liquid in the liquid collecting tank I and the liquid collecting tank II and the radioactivity on the ion exchange column in real time, and feed back to the host computer to evaluate the dynamic performance of the purification unit and the ion exchange column to determine whether to optimize the number of ion exchange columns or replace the ion exchange columns; S5. Ultrasonic level meter III detects the liquid level of the discharge pool in real time and feeds back to the host computer. When the discharge pool reaches a high liquid level, the upstream centrifugal solid-liquid separation unit, membrane solid-liquid separation unit and solid content reduction unit are stopped, and the radioactivity test of the third-party agency is started through the sampling port. If qualified, the purified liquid will be discharged into the sewage network. Otherwise, the purified liquid in the discharge pool will be returned to the deep purification unit for purification again until it is discharged as qualified.

10. The application method of the nuclear medicine diagnosis and treatment waste liquid treatment system as claimed in claim 9, characterized in that: When the equipment needs to be cleaned for maintenance, the host computer starts the flushing unit to clean the inside of each unit, and the flushing water discharges the purified liquid in the pool.

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