Nuclear medical radioactive wastewater treatment system and method

Abstract

The invention provides a nuclear medical radioactive wastewater treatment system and method.The system comprises a pre-precipitation chamber, a buffer chamber, an adsorption chamber, a sewage decay chamber and a sludge decay chamber, two sets of baffles are arranged in the pre-precipitation chamber and divide the pre-precipitation chamber into three cavities, the baffles can prevent large-size solids in wastewater from entering the next pre-cavity, and therefore the large-size solids in the wastewater can be prevented from entering the next pre-cavity; large-size solids naturally precipitate to the bottoms of the chambers and are discharged into the sludge decay chamber, wastewater can enter the next chamber after penetrating through a gap in the middle of the baffle, adsorption, flocculation and precipitation are completed after the wastewater enters the adsorption chamber through the buffer chamber, and radionuclides are separated into sludge from the wastewater through solid-liquid separation. In subsequent treatment, only a small amount of sludge containing radionuclides needs to be discharged into the sludge decay chamber for long-time storage decay, and a large amount of separated wastewater is discharged into the sewage decay chamber for short-time storage and can be directly discharged, so that the use efficiency of the decay tank is greatly improved. The method has the advantages of simple process flow and less secondary waste, and realizes efficient volume reduction and rapid purification treatment of nuclear medical radioactive wastewater.

Description

Technical Field

[0001] This invention belongs to the field of radioactive wastewater treatment technology, and particularly relates to a nuclear medical radioactive wastewater treatment system and method. Background Technology

[0002] In recent years, the application of radiopharmaceuticals and large-scale medical equipment by medical institutions in my country has been increasing in scale and scope. The most commonly used radiopharmaceuticals in nuclear medicine include... 18 F, 99m Tc and 131 I. 18 F, 99m Tc has a very short half-life, resulting in minimal impact on the public and the environment. However, 131 I has high activity and a long half-life (approximately 8 days), and about 50% of the product remains after injection into the patient. 131 I will be excreted in the patient's urine within 24 hours. 131 I is used extensively, accounting for 90% of nuclear medicine therapeutic drugs. To avoid the potential radiation hazards to nuclear medicine workers, patients, and the public, it is necessary to treat drugs containing I. 131 I. Radioactive wastewater shall be properly treated.

[0003] Currently, hospitals in my country generally use the storage decay method to process substances containing... 131 Radioactive wastewater requires temporary storage in decay ponds for at least 180 days. Discharge standards are only met after the total α concentration at the discharge outlet is ≤1 Bq / L and the total β concentration is ≤10 Bq / L. Therefore, existing decay ponds generally suffer from problems such as large space requirements, low treatment efficiency, high irradiation risk, and difficulty in subsequent expansion. Furthermore, radioactive nuclides (such as...) in nuclear medical wastewater... 131 (I) The concentration is extremely low; in fact, the concentrations of detergents and other interfering ions in the wastewater are far greater than the concentrations of radionuclides, further increasing the difficulty of treatment. Therefore, there is an urgent need to develop a simple process flow, low secondary waste volume, and efficient and economical nuclear medical radioactive wastewater treatment system and method. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a nuclear medical radioactive wastewater treatment system and method, which treats wastewater containing radioactive nuclides (such as...) 131 I) Additives with similar chemical properties are used to co-precipitate and adsorb the radionuclides together with the additives and capture and fix them in the adsorbent. After solid-liquid separation, the radionuclides are separated from the wastewater into the sludge. Subsequent treatment only requires storing and decaying a small amount of sludge containing radionuclides, which greatly improves the efficiency of the decay tank.

[0005] In a first aspect, the present invention discloses a nuclear medical radioactive wastewater treatment system, comprising: a pre-sedimentation chamber, a buffer chamber, an adsorption chamber, a wastewater decay chamber, and a sludge decay chamber; The pre-sedimentation chamber has a cylindrical-conical structure with a cylindrical upper part and a conical lower part. The upper part of the pre-sedimentation chamber cylinder is provided with a water inlet. The cylinder is connected to the buffer chamber through a pipeline. The bottom of the pre-sedimentation chamber cone is connected to the sludge decay chamber through a sludge discharge pipe. It is used to naturally settle and separate sludge and solids in wastewater. The buffer chamber is connected to the adsorption chamber by pipeline and is used for temporary storage of radioactive wastewater. The adsorption chamber is equipped with an additive dosing device, an adsorbent dosing device, a flocculant dosing device, and a stirring device. The adsorption chamber is connected to the sludge decay chamber and the wastewater decay chamber through pipelines, and is used for adsorption, flocculation sedimentation and separation of radioactive wastewater. The wastewater decay chamber and sludge decay chamber are respectively connected to the sewage pipe network and are used to store and decay the waste liquid and sludge separated after adsorption, flocculation and sedimentation.

[0006] Furthermore, the pre-sedimentation chamber is equipped with two sets of baffles perpendicular to the dome of the cylinder, dividing the pre-sedimentation chamber into three interconnected pre-sedimentation chambers. Each set of baffles includes an upper baffle and a lower baffle. The upper baffle is used to prevent scum in the radioactive wastewater from entering the next pre-sedimentation chamber, and the lower baffle is used to prevent sludge in the radioactive wastewater from entering the next pre-sedimentation chamber. The radioactive wastewater passes through the gap between the upper baffle and the lower baffle and enters the next pre-sedimentation chamber.

[0007] Furthermore, the cone angle of the pre-sedimentation chamber cone is greater than 45°, and it is connected to the sludge decay chamber through a sludge discharge pipe at the cone angle. A sludge discharge pump is installed on the sludge discharge pipe to control the discharge of sludge.

[0008] Furthermore, the buffer chamber is equipped with a liquid level detection device and a sampling detection system for detecting the liquid level of radioactive wastewater in the buffer chamber and sampling to detect the activity of radioactive wastewater.

[0009] Furthermore, the adsorption chamber has a cylindrical-conical structure with a cylindrical upper part and a conical lower part. The cone corner of the cone is connected to the sludge decay chamber through a sludge discharge pipe. A sludge discharge pump is installed on the sludge discharge pipe to control the discharge of sludge. A drain pipe connected to the wastewater decay chamber is provided at the connection between the cylindrical and conical parts. A drain pump is installed on the drain pipe to control the discharge of wastewater. The adsorption chamber is equipped with a sampling and detection system for sampling and detecting the activity of radioactive wastewater.

[0010] Furthermore, the processing system also includes a central processing unit for controlling the additive dosing device, adsorbent dosing device, and flocculant dosing device to quantitatively add drugs to the radioactive wastewater, controlling the stirring device in the adsorption chamber to stir, and controlling the sampling and detection system in the adsorption chamber to sample and detect the activity of the radioactive wastewater.

[0011] Secondly, the present invention also discloses a method for treating radioactive wastewater from nuclear medicine. This method uses the radioactive wastewater treatment system from the first aspect of the present invention for treatment, and includes the following steps: S1. Pre-precipitation Radioactive wastewater is injected into the pre-sedimentation chamber, where sludge and solids in the wastewater naturally settle to the bottom of the cone. Once the sediment reaches a predetermined amount, it is discharged through the sludge discharge pipe to the sludge decay chamber for storage and decay. The wastewater then enters the buffer chamber through the pipeline. S2. Buffer chamber storage Once the wastewater level in the buffer chamber reaches the set level, the wastewater enters the adsorption chamber through the pipeline. S3. Adsorption and precipitation Add salt containing the corresponding radionuclide ions to the wastewater, stir evenly, add adsorbent and stir; sample and test the activity of radioactive wastewater at fixed time intervals, and after the activity decreases to a stable value, add flocculant to the wastewater and stir; stop stirring after the set stirring time, sludge flocs are formed in the wastewater and settle to the bottom of the adsorption chamber; S4. Solid-liquid separation The sludge at the bottom of the adsorption chamber is discharged into the sludge decay chamber for storage and decay through a pipeline; after the sludge is discharged, the waste liquid in the adsorption chamber is discharged into the wastewater decay chamber for storage and decay through a pipeline.

[0012] Furthermore, the sludge stored in the sludge decay chamber and the waste liquid stored in the wastewater decay chamber are discharged after being tested and found to meet the discharge standards.

[0013] Furthermore, in step S2, after the wastewater volume in the buffer chamber reaches the set water level, the radioactive wastewater is sampled and tested to determine the activity of the radioactive wastewater, thereby determining the amount of salt containing the corresponding radionuclide ions to be added.

[0014] Furthermore, in step S3, the standard for the activity to decrease to a stable value is that the deviation ratio of the radioactive wastewater activity obtained from two consecutive sampling tests is less than 20%.

[0015] This invention provides a nuclear medicine radioactive wastewater treatment system and method, which can efficiently and economically treat nuclear medicine radioactive wastewater, especially iodine-containing radioactive wastewater, and can meet the disposal requirements of nuclear medicine departments for radioactive waste liquids. Compared with the prior art, this invention has at least the following beneficial effects: (1) The present invention creatively sets up a pre-sedimentation chamber and cleverly designs the internal structure of the pre-sedimentation chamber. By setting up the pre-sedimentation chamber of the present invention, it can be ensured that the radioactive wastewater entering the adsorption chamber is basically free of large particulate solid waste. Large particulate solids and sludge have already settled naturally in the pre-sedimentation chamber and are collected at the bottom of the pre-sedimentation chamber to form sludge, which is then stored and decayed in the sludge decay chamber in advance, thereby completing the first solid-liquid separation in the radioactive wastewater.

[0016] (2) This invention does not require complex pretreatment processes; it directly removes radionuclides (such as...) from radioactive wastewater using an adsorbent. 131 I) Adsorption captures and fixes the sludge onto its surface to reduce the activity of the wastewater. The flocculant forms large sludge flocs from suspended solids and excess adsorbent, which then settle rapidly. This efficiently separates the sludge from the wastewater, allowing the sludge with high activity but small volume to decay and the wastewater with low activity but large volume to be rapidly deregulated and directly purified. This not only simplifies the process but also reduces the generation of secondary waste, achieving efficient volume reduction and rapid purification of radioactive wastewater from nuclear medicine.

[0017] (3) This invention targets radioactive nuclides (such as radioactive isotopes) in nuclear medical wastewater. 131 (I) The concentration of radioactive wastewater is extremely low. The concentration of detergents and other interfering ions in the wastewater is much higher than that of radioactive nuclides, making it difficult to treat nuclear wastewater using conventional methods. This invention creatively introduces additives with chemical properties similar to radioactive nuclides but without radioactivity into the wastewater. These additives are usually salts containing the corresponding radioactive nuclide ions, such as NaI and KI. Using a co-precipitation adsorption method, the radioactive nuclides and additives are captured and fixed together in the adsorbent. After flocculation by a flocculant, they are co-precipitated. Through solid-liquid separation, the radioactive nuclides are separated from the wastewater into the sludge. Subsequent treatment only requires the storage and decay of a small amount of sludge containing radioactive nuclides, which greatly improves the utilization efficiency of the decay tank. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the radioactive wastewater treatment system for nuclear medicine according to the present invention.

[0020] Explanation of reference numerals in the attached figures: Pre-sedimentation chamber 1, cylinder 11, cone 12, washing chamber 13, drug delivery chamber 14, upper baffle 15, lower baffle 16, sludge discharge pipe 17, sludge discharge pump 18, liquid level detection device 19. Buffer chamber 2, liquid level detection device 21, sampling detection system 22; Adsorption chamber 3, additive dosing device 31, adsorbent dosing device 32, flocculant dosing device 33, liquid level detection device 34, sampling detection system 35, drain pipe 36, drain pump 361, sludge discharge pipe 37, sludge discharge pump 371. Wastewater decay chamber 4, liquid level detection device 41, high-pressure water pump 42; sludge decay chamber 5, liquid level detection device 51; sewage pipe network 6; deodorization device 7; filter 8; induced draft fan 9. Detailed Implementation

[0021] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0022] Unless otherwise specified, the preferred embodiments of the present invention can be freely combined as needed. Those skilled in the art will understand that the data and various parameters described in the embodiments are merely exemplary and do not constitute a limitation of the present invention. The chemical reagents and equipment used in the following embodiments are all materials and equipment known in the art, and all materials and equipment used in the present invention can be obtained commercially.

[0023] This invention provides a nuclear medical radioactive wastewater treatment system, such as... Figure 1 As shown, it includes: a pre-sedimentation chamber 1, a buffer chamber 2, an adsorption chamber 3, a wastewater decay chamber 4, and a sludge decay chamber 5; The pre-sedimentation chamber 1 has a cylindrical-conical structure with an upper cylindrical body 11 and a lower conical body 12. An inlet is located at the upper part of the cylindrical body 11, connecting to the cleaning chamber 13 and the dosing chamber 14. Radioactive wastewater from the dosing chamber 14 enters the pre-sedimentation chamber 1 through the inlet. The pre-sedimentation chamber 1 contains two sets of baffles perpendicular to the dome of the cylindrical body 11, dividing it into three interconnected pre-sedimentation chambers. Each set of baffles includes an upper baffle 15 and a lower baffle 16. The upper baffle 15 prevents scum from the radioactive wastewater from entering the next pre-sedimentation chamber, and the lower baffle 16 prevents sludge from entering the next pre-sedimentation chamber. Radioactive wastewater passes through the gap between the upper baffle 15 and the lower baffle 16 into the next pre-sedimentation chamber. The cylindrical body 11 is connected to the buffer chamber 2 via a pipeline, through which radioactive wastewater from the pre-sedimentation chamber 1 enters the buffer chamber 2. The cone angle of the pre-sedimentation chamber 1 cone 12 is preferably greater than 45°. The cone angle is connected to the sludge decay chamber 5 through the sludge discharge pipe 17. Large solids and sludge in the wastewater are intercepted by the upper baffle 15 and the lower baffle 16 and naturally settle, depositing at the bottom of the cone 12. After the accumulated sediment reaches a certain amount, the sludge discharge pump 18 on the sludge discharge pipe 17 is turned on, and the sediment enters the sludge decay chamber 5 for storage and decay through the sludge discharge pipe 17. In addition, the pre-sedimentation chamber 1 is also equipped with a liquid level detection device 19.

[0024] Buffer chamber 2 is connected to adsorption chamber 3 by pipeline and is used for temporary storage of radioactive wastewater. Buffer chamber 2 is equipped with a level detection device 21 to detect the level of radioactive wastewater in buffer chamber 2. When the wastewater volume in buffer chamber 2 reaches the set level, the wastewater enters adsorption chamber 3 through the pipeline. Buffer chamber 2 is also equipped with a sampling and detection system 22 for sampling and detecting the radioactive wastewater to determine the activity of radionuclides in the wastewater, which can then determine the amount of additives to be added during the adsorption and precipitation process.

[0025] The adsorption chamber 3 has a cylindrical-conical structure with a cylindrical upper part and a conical lower part. The cone corner is connected to the sludge decay chamber 5 via a sludge discharge pipe 37. A sludge discharge pump 371 is installed on the sludge discharge pipe 37 to control the discharge. A drain pipe 36, connected to the wastewater decay chamber 4, is located at the connection between the cylindrical and conical parts. A drain pump 361 is installed on the drain pipe 36 to control the discharge. Radioactive wastewater can undergo adsorption, flocculation, sedimentation, and separation treatment in the adsorption chamber 3. The upper part of the adsorption chamber 3 is equipped with an additive dosing device 31, an adsorbent dosing device 32, and a flocculant dosing device 33, used to quantitatively add additives, adsorbents, and flocculants with chemical properties similar to the radionuclide to be treated to the radioactive wastewater. The adsorption chamber 3 is also equipped with a liquid level detection device 34 to monitor the liquid level of the radioactive wastewater in the adsorption chamber. The adsorption chamber 3 is also equipped with a sampling and detection system 35 for sampling and detecting the activity of the radioactive wastewater.

[0026] Wastewater decay chamber 4 is used for the storage and decay of wastewater. Wastewater decay chamber 4 is connected to the sewage network 6, and a high-pressure water pump 42 is installed on the pipeline to control the discharge of wastewater from wastewater decay chamber 4. Wastewater meeting discharge standards can be directly discharged into the sewage network 6. Sludge decay chamber 5 is used for the storage and decay of sludge and other solid waste. Sludge decay chamber 5 is connected to the sewage network 6, and sludge meeting discharge standards can be treated as solid waste. Liquid level detection devices 41 and 51 are respectively installed on wastewater decay chamber 4 and sludge decay chamber 5 to monitor their storage capacity.

[0027] The processing system of this invention also includes a central processing unit (CPU), which is communicatively connected to each sludge discharge pump 18, 371 and drainage pump 361 for remote control of their start-up and shutdown. The CPU is also communicatively connected to each liquid level detection device 19, 21, 34, 41, 51 for remote monitoring of the liquid levels in the pre-sedimentation chamber 1, buffer chamber 2, adsorption chamber 3, wastewater decay chamber 4, and sludge decay chamber 5. Furthermore, the CPU is communicatively connected to the metering tanks of the additive dosing device 31, adsorbent dosing device 32, and flocculant dosing device 33 for remote control of the quantitative addition of additives, adsorbents, and flocculants. Finally, the CPU is communicatively connected to the sampling and detection systems 22, 35 for remote control of their sampling and detection of radioactive wastewater activity. Finally, the CPU is communicatively connected to the stirring device in the adsorption chamber 3 for remote control of its stirring operation.

[0028] The processing system of the present invention also includes a deodorizing device 7, a filter 8 and an induced draft fan 9 connected in sequence by air paths. The induced draft fan 9 is connected to the air paths of the pre-sedimentation chamber 1, the buffer chamber 2, the adsorption chamber 3, the wastewater decay chamber 4 and the sludge decay chamber 5 respectively. Under the action of the induced draft fan 9, the waste gas in the pre-sedimentation chamber 1, the buffer chamber 2, the adsorption chamber 3, the wastewater decay chamber 4 and the sludge decay chamber 5 can be discharged. The waste gas is discharged into the air after being deodorized and filtered by the deodorizing device 7 and the filter 8.

[0029] This invention also provides a method for treating radioactive wastewater from nuclear medicine. This method uses the nuclear medicine radioactive wastewater treatment system of this invention and includes the following steps: S1. Pre-precipitation Radioactive wastewater is injected into the pre-sedimentation chamber 1. The sludge and large solid particles in the wastewater naturally settle to the bottom of the cone 12. After the sediment accumulates to a predetermined amount, it is discharged through the sludge discharge pipe 17 to the sludge decay chamber 5 for storage and decay. The wastewater enters the buffer chamber 2 through the pipeline. S2. Buffer chamber storage After the wastewater volume in buffer chamber 2 reaches the set water level, the radioactive wastewater is sampled and tested to determine the activity of the radioactive wastewater. This determines the amount of additive to be added that is similar in chemical properties to the nuclide to be treated. Then the wastewater enters adsorption chamber 3 through pipeline. The additive is preferably a salt containing the corresponding radionuclide ion. For iodine-containing radioactive wastewater commonly found in the field of nuclear medicine, NaI or KI can be selected as the additive. S3. Adsorption and precipitation The additive is added to the wastewater and stirred until homogeneous. Then, the adsorbent is added and stirred again. The radioactive wastewater activity is sampled and tested at fixed time intervals. Once the activity decreases to a stable value, the flocculant is added to the wastewater and stirred. After a set stirring time, stirring is stopped, and sludge flocs form in the wastewater and settle to the bottom of adsorption chamber 3. The standard for the activity to decrease to a stable value is that the deviation ratio of the radioactive wastewater activity obtained from two consecutive sampling tests is less than 20%. S4. Solid-liquid separation The sludge at the bottom of adsorption chamber 3 is discharged into sludge decay chamber 5 via pipeline for storage and decay. After the sludge is discharged, the waste liquid in adsorption chamber 3 is discharged into wastewater decay chamber 4 via pipeline for storage and decay. The sludge stored in sludge decay chamber 5 and the waste liquid stored in wastewater decay chamber 4 are discharged after being tested and found to meet the discharge standards.

[0030] The present invention will now be described in more detail with reference to exemplary embodiments. The following embodiments or experimental data are intended to illustrate the present invention by way of example, and those skilled in the art should understand that the present invention is not limited to these embodiments or experimental data.

[0031] Example 1 The nuclear medical radioactive wastewater treatment system of the present invention is used to treat iodine-containing radioactive wastewater. The nuclear medical radioactive wastewater treatment system of the present invention is as follows: Figure 1 As shown, it includes the following steps: S1. Pre-precipitation will contain 131 Radioactive wastewater is injected into pre-sedimentation chamber 1 through dosing chamber 14. The wastewater passes through the gaps between two sets of upper baffles 15 and lower baffles 16, through three pre-sedimentation chambers, and enters buffer chamber 2 through pipelines. The scum in the radioactive wastewater is blocked by the upper baffle 15 and cannot enter the next pre-sedimentation chamber. The sludge in the radioactive wastewater is blocked by the lower baffle 16 and cannot enter the next pre-sedimentation chamber. However, the wastewater can freely pass through the gaps between the two sets of upper baffles 15 and lower baffles 16 and enter the next pre-sedimentation chamber. The sludge and large solid particles in the wastewater naturally settle to the bottom of cone 12. After the sediment accumulates to a predetermined amount, the central processing unit controls the sludge discharge pump 18 to work and discharge the sediment through the sludge discharge pipe 17 to the sludge decay chamber 5 for storage and decay.

[0032] S2. Buffer chamber storage When the level detection device 21 detects that the wastewater volume in the buffer chamber 2 has reached the set level, the central processing unit controls the sampling and detection system 22 to sample and detect the radioactive wastewater, and to determine the radioactive wastewater content. 131 I activity is used to determine the amount of additive NaI or KI to be added, and then the wastewater enters the adsorption chamber 3 through the pipeline.

[0033] S3. Adsorption and precipitation The central processor controls the metering device of the additive dosing device 31 to add additives quantitatively to the wastewater. The central processor also controls the stirring device to work, and after stirring evenly, the adsorbent is added.

[0034] The central processing unit controls the metering device of the adsorbent dosing device 32 to add a measured amount of adsorbent to the wastewater while maintaining stirring. The central processing unit also activates the sampling and detection system 35 to sample and detect radioactive wastewater at 15-minute intervals. 131 I activity, when radioactive wastewater is detected in two consecutive samples. 131 When the deviation ratio of I activity is less than 20%, it can be considered that the activity of radioactive wastewater has no significant change, indicating that the adsorption process of the adsorbent has ended at this time. 131 I and the additives have been co-captured and immobilized in the adsorbent.

[0035] The central processing unit controls the metering device of the flocculant dosing device 33 to add flocculant quantitatively to the wastewater. After stirring for 1 hour, the stirring is stopped. The unprecipitated suspended solids and adsorbent in the wastewater form large sludge flocs under the action of the flocculant. Once all the sludge flocs have settled to the bottom of the adsorption chamber 3, the adsorption flocculation and sedimentation treatment is completed.

[0036] S4. Solid-liquid separation The sludge discharge pump 371 is controlled by the central processing unit to discharge the sludge at the bottom of the adsorption chamber 3 into the sludge decay chamber 5 for storage and decay through the sludge discharge pipe 37; after the sludge is discharged, the sludge discharge pump 371 is turned off. The central processing unit controls the operation of the drainage pump 361 to discharge the waste liquid in the adsorption chamber 3 into the wastewater decay chamber 4 for storage and decay through the drainage pipe 36. At the same time, the central processing unit controls the cleaning chamber 13 to inject clean water into the pretreatment chamber 1 to rinse the pretreatment chamber 1, the buffer chamber 2, and the adsorption chamber 3. The rinsed wastewater is discharged into the wastewater decay chamber 4 along with the supernatant for storage and decay. After the waste liquid is drained, the drainage pump 361 is turned off.

[0037] The wastewater decay chamber 4 stores clean liquid, which, after testing and meeting emission standards, is directly discharged into the sewage network 6 via the high-pressure water pump 42 activated by the central processing unit. The sludge stored in the sludge decay chamber 5, after testing and meeting emission standards, is treated as solid waste. The emission standards refer to national standards GB 18466-2005 and GB 18871-2002, as well as the specific requirements of the Technical Specification for Hospital Wastewater Treatment Engineering HJ 2029-2013 and the Radiation Protection and Safety Requirements for Nuclear Medicine HJ 1188-2021, etc., which will not be elaborated upon in this invention.

[0038] The materials and equipment used in this invention are all commercially available. The above description is only a preferred embodiment of the present invention and is not intended to limit the invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A nuclear medical radioactive wastewater treatment system, characterized in that, The treatment system includes: a pre-sedimentation chamber, a buffer chamber, an adsorption chamber, a wastewater decay chamber, and a sludge decay chamber; The pre-sedimentation chamber has a cylindrical-conical structure with a cylindrical upper part and a conical lower part. The upper part of the pre-sedimentation chamber cylinder is provided with a water inlet. The cylinder is connected to the buffer chamber through a pipeline. The bottom of the pre-sedimentation chamber cone is connected to the sludge decay chamber through a sludge discharge pipe. It is used to naturally settle and separate sludge and solids in wastewater. The buffer chamber is connected to the adsorption chamber by pipeline and is used for temporary storage of radioactive wastewater. The adsorption chamber is equipped with an additive dosing device, an adsorbent dosing device, a flocculant dosing device, and a stirring device. The adsorption chamber is connected to the sludge decay chamber and the wastewater decay chamber through pipelines, and is used for adsorption, flocculation sedimentation and separation of radioactive wastewater. The wastewater decay chamber and sludge decay chamber are respectively connected to the sewage pipe network and are used to store and decay the waste liquid and sludge separated after adsorption, flocculation and sedimentation.

2. The radioactive wastewater treatment system according to claim 1, characterized in that, The pre-sedimentation chamber is equipped with two sets of baffles perpendicular to the dome of the cylinder, which divide the pre-sedimentation chamber into three interconnected pre-sedimentation chambers. Each set of baffles includes an upper baffle and a lower baffle. The upper baffle is used to prevent scum in the radioactive wastewater from entering the next pre-sedimentation chamber, and the lower baffle is used to prevent sludge in the radioactive wastewater from entering the next pre-sedimentation chamber. The radioactive wastewater passes through the gap between the upper baffle and the lower baffle and enters the next pre-sedimentation chamber.

3. The radioactive wastewater treatment system according to claim 2, characterized in that, The cone angle of the pre-sedimentation chamber is greater than 45°. At the cone angle, it is connected to the sludge decay chamber through a sludge discharge pipe. A sludge discharge pump is installed on the sludge discharge pipe to control the discharge of sludge.

4. The radioactive wastewater treatment system according to claim 1, characterized in that, The buffer chamber is equipped with a liquid level detection device and a sampling detection system, which are used to detect the liquid level of radioactive wastewater in the buffer chamber and to sample and detect the activity of radioactive wastewater.

5. The radioactive wastewater treatment system according to claim 1, characterized in that, The adsorption chamber has a cylindrical-conical structure with a cylindrical upper part and a conical lower part. The cone corner of the conical structure is connected to the sludge decay chamber through a sludge discharge pipe. A sludge discharge pump is installed on the sludge discharge pipe to control the discharge of sludge. A drain pipe connected to the wastewater decay chamber is installed at the connection between the cylindrical and conical structures. A drain pump is installed on the drain pipe to control the discharge of wastewater. The adsorption chamber is equipped with a sampling and detection system for sampling and detecting the activity of radioactive wastewater.

6. The radioactive wastewater treatment system according to claim 5, characterized in that, The processing system also includes a central processing unit, which controls the additive dosing device, adsorbent dosing device, and flocculant dosing device to quantitatively add drugs to the radioactive wastewater, controls the stirring device in the adsorption chamber to stir, and controls the sampling and detection system in the adsorption chamber to sample and detect the activity of the radioactive wastewater.

7. A method for treating radioactive wastewater from nuclear medicine, characterized in that, The treatment method uses the nuclear medical radioactive wastewater treatment system according to any one of claims 1-6, and includes the following steps: S1. Pre-precipitation Radioactive wastewater is injected into the pre-sedimentation chamber, where sludge and solids in the wastewater naturally settle to the bottom of the cone. Once the sediment reaches a predetermined amount, it is discharged through the sludge discharge pipe to the sludge decay chamber for storage and decay. The wastewater then enters the buffer chamber through the pipeline. S2. Buffer chamber storage Once the wastewater level in the buffer chamber reaches the set level, the wastewater enters the adsorption chamber through the pipeline. S3. Adsorption and precipitation Add salt containing the corresponding radionuclide ions to the wastewater, stir evenly, add adsorbent and stir; sample and test the activity of radioactive wastewater at fixed time intervals, and after the activity decreases to a stable value, add flocculant to the wastewater and stir; stop stirring after the set stirring time, sludge flocs are formed in the wastewater and settle to the bottom of the adsorption chamber; S4. Solid-liquid separation The sludge at the bottom of the adsorption chamber is discharged into the sludge decay chamber for storage and decay through a pipeline; after the sludge is discharged, the waste liquid in the adsorption chamber is discharged into the wastewater decay chamber for storage and decay through a pipeline.

8. The method for treating radioactive wastewater from nuclear medicine according to claim 7, characterized in that, The sludge stored in the sludge decay chamber and the waste liquid stored in the wastewater decay chamber are discharged after being tested and found to meet the discharge standards.

9. The method for treating radioactive wastewater from nuclear medicine according to claim 7, characterized in that, In step S2, after the wastewater volume in the buffer chamber reaches the set water level, the radioactive wastewater is sampled and tested to determine the activity of the radioactive wastewater, thereby determining the amount of salt containing the corresponding radionuclide ions to be added.

10. The method for treating radioactive wastewater from nuclear medicine according to claim 7, characterized in that, In step S3, the standard for the activity to decrease to a stable value is that the deviation ratio of the radioactive wastewater activity obtained from two consecutive sampling tests is less than 20%.

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