Hospital nuclear medicine treatment ward radioactive bath sewage classification multi-stage treatment system

Abstract

The utility model relates to a nuclear medicine treatment ward radioactive bath sewage classification multistage treatment system, the hospital nuclear medicine treatment ward radioactive bath sewage classification multistage system comprises a pre-treatment unit, a post-treatment unit and a measurement and control unit, the pre-treatment unit comprises a temporary storage water tank, and an electronic liquid level meter and a first activity detector are arranged in the temporary storage water tank; the post-treatment unit comprises a plurality of groups of first decay pools and a plurality of groups of second decay pools, a second pipeline and a third pipeline are respectively connected between the first decay pools and the temporary storage water tank and between the second decay pools and the temporary storage water tank, a second electric control valve and a third electric control valve are respectively connected to the second pipeline and the third pipeline, and water outlets of the first decay pools and the second decay pools are respectively connected with a fourth pipeline and a fifth pipeline; a fourth electric control valve and a fifth electric control valve are respectively connected to the first decay tank, and a second activity detector is also arranged in the first decay tank so as to monitor the activity concentration of the radiopharmaceutical in the first decay tank in real time. The treatment device can simultaneously achieve the purposes of safely discharging and reducing the treatment burden by reducing the water storage capacity.

Description

Technical Field

[0001] The utility model relates to the field of medical radioactive sewage treatment, in particular to a radioactive bath sewage classification multi-stage treatment system for a hospital nuclear medicine treatment ward. Background Technique

[0002] In nuclear medicine, some special patients need to be treated by injecting radioactive drugs. When the injection dose exceeds a certain value, the patients need to be arranged to live in special wards and can only be discharged after the radioactive drugs in their bodies are metabolized to meet the requirements. During the hospitalization period, the main metabolic pathway of the patients is to excrete through urine and feces. Since the excreted metabolic wastes contain radioactive drugs exceeding the standard, they need to be discharged into the decay pool for decay treatment first. It should be noted that the metabolic wastes mainly come from two parts: fecal water and bath sewage. Although the radioactive nuclides on the patient's body surface are less, the water consumption is large; in addition, some patients occasionally excrete during bathing, and the radioactive nuclides contained in the bath water sewage in this case are more. The Ministry of Ecology and Environment's "HJ1188-2021 Nuclear Medicine Radiation Protection and Safety Requirements" clearly stipulates that radioactive waste liquid containing iodine-131 nuclides can only reach the decay standard and be discharged after being stored for more than 180 days. Therefore, the sewage storage volume in the decay pool will be very large. For this reason, hospitals will increase the capacity of the nuclear medicine decay pool during setting to meet the national discharge standards, which makes the storage pressure relatively large. In order to reduce the temporary storage pressure of hospital radioactive sewage, we have developed a radioactive sewage classification multi-stage treatment system for a hospital nuclear medicine treatment ward to solve the above problems. Content of the Utility Model

[0003] The utility model aims to make up for the deficiencies of the prior art and provides a radioactive bath sewage classification multi-stage treatment system for a nuclear medicine treatment ward, which can simultaneously achieve the purpose of reducing the sewage treatment burden and safe discharge by reducing the water storage volume.

[0004] The technical solution adopted by the utility model to solve the above technical problems is:

[0005] A radioactive bath sewage classification multi-stage treatment system for a hospital nuclear medicine treatment ward, comprising:

[0006] A pretreatment unit, which includes a temporary storage water tank. An electronic liquid level gauge and a first activity detector are arranged in the temporary storage water tank. A first pipeline is connected between the water inlet of the temporary storage water tank and the bath water outlet. A first electric control valve is connected to the first pipeline;

[0007] A post-treatment unit, which includes a number of first decay pools and a number of second decay pools. A second pipeline is connected between the first decay pool and the temporary storage water tank. A third pipeline is connected between the second decay pool and the temporary storage water tank. A second electric control valve and a third electric control valve are respectively connected to the second pipeline and the third pipeline. The water outlets of the first decay pool and the second decay pool are respectively connected to a fourth pipeline and a fifth pipeline. A fourth electric control valve and a fifth electric control valve are respectively connected to the fourth pipeline and the fifth pipeline. A second activity detector is provided in the first decay pool to monitor the activity concentration of the radioactive drug therein in real time;

[0008] A measurement and control unit, which includes a controller and a time-delay relay and a timer connected thereto. The time-delay relay is used to detect the liquid level parameter of the electronic liquid level gauge, so as to control the switch of the first electric control valve and the operation of the first activity detector through the controller. The timer is used to detect the retention time of the sewage in the second decay pool, so as to control the switch of the fifth electric control valve through the controller. The second activity detector is connected to the controller to control the switch of the fourth electric control valve according to the activity concentration of the sewage in the first decay pool. The second solenoid valve and the third solenoid valve are connected to the controller to control the opening of the second solenoid valve or the opening of the third solenoid valve through the measurement parameters of the first activity detector.

[0009] In one example, a liquid level sensor is respectively provided in each of the first decay pool and the second decay pool. The liquid level sensor is connected to the controller, so that the multiple first decay pools and the multiple second decay pools respectively discharge sewage according to the liquid level signals therein by switching.

[0010] In one example, two temporary storage water tanks are arranged in parallel.

[0011] In one example, the first electric control valve, the second electric control valve, the third electric control valve, the fourth electric control valve and the fifth electric control valve all adopt solenoid valves.

[0012] In one example, the second decay pool is a high-concentration decay pool for an iodine treatment ward.

[0013] In one example, the water outlet of the temporary storage water tank is arranged at its upper part. A lift pump connected to the controller is provided at the bottom inside the temporary storage water tank. Pipeline pumps connected to the controller are respectively provided on the fourth pipeline and the fifth pipeline.

[0014] In one example, a biodegradation pool is further provided between the temporary storage water tank and the second decay pool. The third pipeline is connected between the biodegradation pool and the temporary storage water tank. A sixth pipeline is connected between the biodegradation pool and the second decay pool. A sixth electric control valve is connected to the sixth pipeline.

[0015] In one example, manholes are provided at the tops of both the first decay pool and the second decay pool to facilitate personnel to enter for maintenance.

[0016] The present utility model adopts the above technical solution, and the advantages are as follows: The radioactive bath sewage classification multi-stage treatment system, through the cooperation of the pretreatment unit, the post-treatment unit and the measurement and control unit, can carry out shunt treatment on the sewage according to the radioactive drug activity data in the sewage. After shunt, different treatment methods are selectively used, and at the same time, the purposes of safe sewage discharge and reduction of water storage capacity are achieved. Specifically, the shunt treatment can shorten the discharge time of some sewage on the premise of safe discharge. Compared with the existing fixed storage treatment method, the present application greatly reduces the sewage storage burden, which not only helps to reduce the equipment construction cost under the set treatment volume of the hospital, but also helps to ensure that the sewage meets the discharge standard after the decay time. Brief Description of the Drawings

[0017] Figure 1 It is a schematic structural diagram of one embodiment of the present invention;

[0018] Figure 2 It is a control schematic diagram of the present invention.

[0019] In the figure, 1. temporary storage water tank, 2. electronic liquid level gauge, 3. first activity detector, 4. first pipeline, 5. first electric control valve, 6. first decay pool, 7. second decay pool, 8. second pipeline, 9. third pipeline, 10. second electric control valve, 11. third electric control valve, 12. fourth pipeline, 13. fifth pipeline, 14. fourth electric control valve, 15. fifth electric control, 16. second activity detector, 17. controller, 18. liquid level sensor, 19. biodegradation pool. Detailed Embodiments

[0020] In order to clearly illustrate the technical features of the present solution, the present utility model will be elaborated in detail below through specific embodiments and in conjunction with the drawings.

[0021] In the description of this specification, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality" means two or more, unless otherwise specifically defined. The description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0022] In a hospital, when treating radioactive sewage, it needs to be stored for a certain period of time for decay before discharge. Sometimes, due to sudden increases in the treatment volume or other situations, the water storage volume may exceed the treatment capacity. To avoid this, the hospital either sets up excessive water storage equipment during construction or controls the number of inpatients during later use. However, neither of these can fundamentally solve the problem of the large water storage burden, and the former will lead to a significant increase in setup costs and floor area. To solve the above problems, the inventor has conducted extensive research and thinking, and through reverse thinking, reduces the water storage burden by reducing the water storage volume, so as to enable the sewage to meet the decay time and achieve the safe discharge of sewage.

[0023] As Figure 1-2 shown, in this embodiment, the radioactive bathing sewage classification multi-stage treatment system in the hospital's nuclear medicine treatment ward includes:

[0024] A pretreatment unit, which includes a temporary storage water tank 1. An electronic liquid level gauge 2 and a first activity detector 3 are provided in the temporary storage water tank 1. A first pipeline 4 is connected between the water inlet of the temporary storage water tank 1 and the bathing sewage outlet, and a first electric control valve 5 is connected to the first pipeline 4;

[0025] A post-treatment unit, which includes a number of first decay pools 6 and a number of second decay pools 7. A second pipeline 8 is connected between the first decay pool 6 and the temporary storage water tank 1, and a third pipeline 9 is connected between the second decay pool 7 and the temporary storage water tank 1. Second electric control valves 10 and third electric control valves 11 are respectively connected to the second pipeline 8 and the third pipeline 9. The water outlets of the first decay pool 6 and the second decay pool 7 are respectively connected to a fourth pipeline 12 and a fifth pipeline 13. Fourth electric control valves 14 and fifth electric control valves 15 are respectively connected to the fourth pipeline 12 and the fifth pipeline 13. A second activity detector 16 is provided in the first decay pool 6 to continuously monitor the activity concentration of the radioactive drug therein;

[0026] A measurement and control unit, which includes a controller 17 and a time delay relay and a timer connected thereto. The time delay relay is used to detect the liquid level parameter of the electronic liquid level gauge 2 to control the opening and closing of the first electric control valve 5 and the operation of the first activity detector 3 through the controller 17. The timer is used to detect the retention time of the sewage in the second decay pool 7 to control the opening and closing of the fifth electric control valve 15 through the controller 17. The second activity detector 16 is connected to the controller 17 to control the opening and closing of the fourth electric control valve 14 according to the activity concentration of the sewage in the first decay pool 6. The second solenoid valve 10 and the third solenoid valve 11 are connected to the controller 17 to control the opening of the second solenoid valve 10 or the opening of the third solenoid valve 11 through the measurement parameters of the first activity detector 16. The controller therein can adopt a PLC controller capable of human-computer interaction.

[0027] Further, a liquid level sensor 18 is respectively arranged in each of the first decay tanks 6 and the second decay tanks 7, and the liquid level sensor 18 is connected to the controller 17, so that the plurality of first decay tanks 6 and the plurality of second decay tanks 7 are respectively switched according to the liquid level signals therein to discharge sewage.

[0028] Principle of use: When a patient takes a bath, the bath water flows through the drain opening to the temporary storage water tank 1. An electronic liquid level gauge 2 is arranged in the temporary storage water tank 1 to measure the water level. When the liquid level parameter of the electronic liquid level gauge 2 does not change within a certain period of time, for example, about 15 or 20 minutes, it can be determined that the patient has finished taking a bath. At this time, the controller 17 will control the first electric control valve 5 to close, so that the first activity detector 3 performs sewage activity detection, and the activity concentration value is set as A.

[0029] When the activity concentration value A is greater than or equal to the preset threshold, the third electric control valve 10 will open, so that the water in the temporary storage water tank 1 flows into the second decay tank 7. The second decay tank 7 decays for a fixed time. Therefore, when the water is no longer discharged and the liquid level is reached, the timer connected to the controller 17 starts timing. After reaching the set time, the fifth electric control valve 15 opens and the sewage is discharged to the septic tank through the pipeline pump. The number of groups of the second decay tanks 7 is set according to actual needs, and the second decay tanks 7 between adjacent groups are switched through the liquid level compliance signal. Regarding the wastewater in the second decay tank 7, if it is subjected to other treatments or meets other regulations and is approved by the regulatory department, it can also be discharged according to regulations.

[0030] When the activity concentration value A is less than the set threshold, the second electric control valve 9 opens, so that the water in the temporary storage water tank 1 flows into the first decay tank 6, and the second activity detector 16 performs real-time activity measurement. The activity concentration value is set as B. When B reaches the discharge standard value, the fourth electric control valve 14 opens and the sewage is discharged to the septic tank through the pipeline pump. The number of groups of the first decay tanks 6 can be set according to actual needs, and the second decay tanks 7 between adjacent groups are switched through the liquid level compliance signal. In each group of the first decay tanks, on the one hand, the radioactive drug decays over time, causing the activity concentration value B to decrease; on the other hand, if there is no urine in the bath water, it is equivalent to diluting the first decay tank, and the activity concentration value B will also decrease, enabling it to quickly reach the discharge standard, generally 10 becquerels per liter.

[0031] Regarding the setting quantity of the first decay tank and the second decay tank, it should be calculated according to the specific use situation of the radioactive drug in the hospital to ensure that all the generated radioactive sewage can be safely discharged. For example, when in use, when the liquid level of one of the first decay tanks 6 reaches the upper limit of water storage, the corresponding second electric control valve is closed, and the second electric control valve of another first decay tank 6 is opened to switch the water storage. Before the last empty first decay tank 6 is filled with water, the first decay tank that stored water first will reach the discharge standard, facilitating the start of the next cycle. The setting principle of the second decay tank 7 is the same as above.

[0032] In one specific embodiment, two temporary storage water tanks 1 are arranged in parallel, which can be used interchangeably or one as a standby and the other for use.

[0033] In one specific embodiment, each group of second decay tanks is composed of multiple serially connected decay tanks. Such an arrangement is beneficial for further shortening the discharge time. For example, if a total of 4 groups of second decay tanks are provided and each group has 2 serially connected tanks, when the first tank has been placed for half of the decay time during use, it can be discharged into the second tank for the other half of the time to vacate the first tank for standby as soon as possible. The above arrangement is equivalent to shortening the time that the sewage stays in each tank.

[0034] In one specific embodiment, the first electric control valve 5, the second electric control valve 10, the third electric control valve 11, the fourth electric control valve 14, and the fifth electric control valve 15 all adopt solenoid valves.

[0035] In one specific embodiment, the second decay tank 7 is a high-concentration decay tank for the iodine treatment ward. This area is a high-activity concentration area, so when the bathing area reaches a relatively high measured value, it can be discharged into this area for treatment. This area is for treating the waste liquid from the toilet and the washbasin. At this time, a biodegradation tank 19 can be provided between the temporary storage water tank 1 and the second decay tank 7 to mainly degrade and deposit fixed wastes. A third pipeline is connected between the biodegradation tank 19 and the temporary storage water tank 1, and a sixth pipeline is connected between the biodegradation tank and the second decay tank. A sixth electric control valve is connected to the sixth pipeline.

[0036] In one specific embodiment, the water outlet of the temporary storage water tank 1 is provided at its upper part, a lift pump is provided at the bottom inside the temporary storage water tank 1, and pipeline pumps connected to the controller are respectively provided on the fourth pipeline and the fifth pipeline.

[0037] In one specific embodiment, manholes are provided at the tops of both the first decay tank and the second decay tank to facilitate personnel to enter for maintenance.

[0038] The above specific embodiments cannot be used to limit the protection scope of the present invention. For those skilled in the art of this technology, any alternative improvement or transformation made to the embodiments of the present invention falls within the protection scope of the present invention.

[0039] Where the present invention is not described in detail are all well-known technologies to those skilled in the art of this technology.

Claims

1. A multi-stage treatment system for radioactive shower wastewater in a hospital nuclear medicine treatment ward, characterized in that: include: The pre-treatment unit comprises a temporary water tank, wherein an electronic liquid level meter and a first activity detector are arranged in the temporary water tank, a first pipeline is connected between a water inlet of the temporary water tank and a shower outlet, and a first electric control valve is connected to the first pipeline; A post-processing unit, comprising a plurality of first decay pools and a plurality of second decay pools, wherein a second pipeline is connected between the first decay pool and a temporary water tank, a third pipeline is connected between the second decay pool and the temporary water tank, a second electric-controlled valve and a third electric-controlled valve are connected to the second pipeline and the third pipeline respectively, water outlets of the first decay pool and the second decay pool are connected to a fourth pipeline and a fifth pipeline respectively, a fourth electric-controlled valve and a fifth electric-controlled valve are connected to the fourth pipeline and the fifth pipeline respectively, and a second activity detector is provided in the first decay pool to monitor the activity concentration of the radioactive drug therein in real time; The measurement and control unit includes a controller and a time delay relay and a timer connected thereto, wherein the time delay relay is used to detect the liquid level parameters of the electronic liquid level meter so as to control the first electric control valve switch and the first activity detector through the controller, the timer is used to detect the sewage retention time in the second decay tank so as to control the fifth electric control valve switch through the controller, the second activity detector is connected to the controller so as to control the fourth electric control valve switch according to the activity concentration of the sewage in the first decay tank, and the second and third electric control valves are connected to the controller so as to control the second electric control valve to open or the third electric control valve to open according to the measurement parameters of the first activity detector.

2. The multi-stage treatment system for radioactive shower wastewater in a nuclear medicine treatment ward of a hospital according to claim 1 is characterized in that: A liquid level sensor is provided in each of the first decay pool and the second decay pool, respectively. The liquid level sensor is connected to the controller so that the first decay pools and the second decay pools are switched according to the liquid level signals therein to discharge sewage.

3. The multi-stage treatment system for radioactive shower wastewater in a nuclear medicine treatment ward of a hospital according to claim 1 is characterized in that: The temporary water tanks are provided with two in parallel.

4. The multi-stage treatment system for radioactive shower wastewater in a nuclear medicine treatment ward of a hospital according to claim 1 is characterized in that: The first electrically controlled valve, the second electrically controlled valve, the third electrically controlled valve, the fourth electrically controlled valve and the fifth electrically controlled valve are all solenoid valves.

5. The multi-stage treatment system for radioactive shower wastewater in a nuclear medicine treatment ward of a hospital according to claim 1 is characterized in that: The second decay pool is a high-concentration decay pool in the iodine treatment ward.

6. The multi-stage treatment system for radioactive shower wastewater in a nuclear medicine treatment ward of a hospital according to claim 1 is characterized in that: A biodegradation pool is also provided between the temporary water tank and the second decay pool. The third pipeline is connected between the biodegradation pool and the temporary water tank. A sixth pipeline is connected between the biodegradation pool and the second decay pool. A sixth electric-controlled valve is connected to the sixth pipeline.

Images