Radioactive waste liquid treatment equipment and radioactive waste liquid treatment method

Abstract

The invention belongs to the technical field of radioactive waste liquid treatment, and particularly relates to radioactive waste liquid treatment equipment and a radioactive waste liquid treatment method. A primary membrane treatment device in the equipment is arranged in a container, waste liquid to be treated is connected into the equipment through a liquid inlet joint on the container and conveyed to a first buffer container, and a first booster pump conveys the waste liquid to be treated in the first buffer container to a primary membrane assembly for separation treatment. In the first-stage membrane assembly, radionuclides Sb-125, Ag-110m and the like in the waste liquid are intercepted by a first nanofiltration membrane by means of selective permeability of the first nanofiltration membrane, and the radionuclides and the concentrated liquid jointly form a first concentrated liquid. The equipment can effectively purify Sb-125, Ag-110m and other difficult-to-treat nuclides in the radioactive waste liquid of the nuclear power plant, is short in treatment period, high in efficiency and low in cost, and can be flexibly moved to different positions to treat a unit. According to the radioactive waste liquid treatment method provided by the invention, the treatment efficiency of the radioactive waste liquid is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of radioactive waste liquid treatment, and in particular to a radioactive waste liquid treatment device and a radioactive waste liquid treatment method. Background Art

[0002] When nuclear power plants are operating normally, a large amount of radioactive waste liquid will be generated. If the waste liquid contains a large amount of radioactive particulate matter and radionuclides, it will cause serious harm to human health and the natural environment if it is discharged directly. Therefore, the waste liquid needs to be treated until it meets the emission standards before it can be discharged.

[0003] The AP1000 unit generally uses filtration and ion exchange treatment technology to treat radioactive waste liquid. When treating difficult-to-treat nuclides such as Sb-125 and Ag-110m, a large amount of resin will be consumed. Finally, the waste liquid that cannot be completely purified by the resin will be evaporated and concentrated into solid waste. This method has the problems of large amount of solid waste, long treatment cycle and high cost.

[0004] Therefore, there is an urgent need for a radioactive waste liquid treatment device to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a radioactive waste liquid treatment device, which can effectively purify the difficult-to-treat nuclides such as Sb-125 and Ag-110m in the radioactive waste liquid of nuclear power plants, has a short treatment cycle, high efficiency and low cost, and can be flexibly moved to different positions to treat the units.

[0006] Another object of the present invention is to provide a method for treating radioactive liquid waste to improve the treatment efficiency of radioactive liquid waste.

[0007] To achieve this object, the present invention adopts the following technical solutions:

[0008] Radioactive liquid waste treatment equipment, including:

[0009] A container, wherein the container is provided with a liquid inlet connector, one end of which is used to receive radioactive waste liquid;

[0010] A primary membrane treatment device is arranged in the container, and the primary membrane treatment device includes a first buffer container, a primary membrane assembly and a first booster pump. The first buffer container is provided with a first inlet and a first outlet, and the first inlet is connected to the other end of the liquid inlet joint; the primary membrane assembly adopts a first nanofiltration membrane, and the primary membrane assembly has a radioactive waste liquid inlet, a first dialysate outlet and a first concentrated liquid outlet. The radioactive waste liquid inlet is connected to the first outlet, the first dialysate outlet is connected to the dialysate discharge pipeline, the first dialysate outlet is used to discharge the first dialysate, the first concentrated liquid outlet is connected to the first inlet to transport the first concentrated liquid to the first buffer container, and the first booster pump is arranged between the first buffer container and the primary membrane assembly, and the first booster pump is used to transport the radioactive waste liquid in the first buffer container to the primary membrane assembly.

[0011] As an optional technical solution, the radioactive liquid waste treatment equipment further includes a secondary membrane treatment device, which is arranged in the container and includes:

[0012] a second buffer container, wherein the second buffer container is provided with a second inlet, a third inlet and a second outlet, and the second inlet is connected to the first concentrated liquid outlet;

[0013] A secondary membrane assembly, using a second nanofiltration membrane, the secondary membrane assembly having a first concentrated liquid inlet, a second dialysate outlet and a second concentrated liquid outlet, the first concentrated liquid inlet is connected to the second outlet, the second dialysate outlet is connected to the dialysate discharge pipeline, the second dialysate outlet is used to discharge the second dialysate, and the second concentrated liquid outlet is connected to the third inlet to transport the second concentrated liquid to the second buffer container;

[0014] The second booster pump is disposed between the second buffer container and the secondary membrane assembly, and is used to transport the first concentrated liquid in the second buffer container to the secondary membrane assembly.

[0015] As an optional technical solution, the secondary membrane treatment device further includes a desalted water pipeline, the desalted water pipeline is connected to the third inlet, and the desalted water pipeline is used to transport desalted water to the secondary membrane assembly.

[0016] As an optional technical solution, a heating element is provided on the desalted water pipeline, and the heating element is used to heat the desalted water.

[0017] As an optional technical solution, the radioactive liquid waste treatment equipment further includes a dialysate buffer container, which is connected to the dialysate discharge pipeline and is used to temporarily store the first dialysate and the second dialysate.

[0018] As an optional technical solution, the radioactive liquid waste treatment equipment further includes a concentrated liquid discharge pipeline, and the concentrated liquid discharge pipeline is connected to both the first outlet and the second outlet.

[0019] As an optional technical solution, a first sampling port is provided on the dialysate discharge pipeline, and the first sampling port is used for sampling and analyzing the first dialysate.

[0020] As an optional technical solution, the radioactive liquid waste treatment equipment also includes a flushing pipeline, one end of which is connected to the dialysate discharge pipeline, and the other end is connected to one end of the first buffer container where the first inlet is set, and the flushing pipeline is used to flush the first buffer container, the primary membrane assembly, and the connecting pipeline between the first buffer container and the primary membrane assembly.

[0021] The present invention also adopts the following technical solutions:

[0022] A method for treating radioactive liquid waste, applicable to the radioactive liquid waste treatment equipment as described in any of the above schemes, the method for treating radioactive liquid waste comprising:

[0023] S1. transporting the radioactive waste liquid to the first buffer container;

[0024] S2. The radioactive waste liquid in the first buffer container is transported to the primary membrane assembly through the first booster pump for separation treatment, and the first dialysate and the first concentrated liquid are obtained. The first dialysate is discharged to a designated location through the dialysate discharge pipeline, and the first concentrated liquid is returned to the first buffer container. The first concentrated liquid and the radioactive waste liquid entering the first buffer container are subjected to the next separation treatment together until the radioactive waste liquid of this batch is transported completely;

[0025] S3. After the radioactive waste liquid is transported, the primary membrane treatment device continues to circulate and separate until the first concentrated liquid reaches a target concentration multiple.

[0026] As an optional technical solution, the radioactive liquid waste treatment device further includes a secondary membrane treatment device, and the secondary membrane treatment device is used to separate and treat the first concentrated liquid. The radioactive liquid waste treatment method further includes:

[0027] S4. Using the secondary membrane treatment device to separate and treat the first concentrated liquid.

[0028] Beneficial effects of the present invention:

[0029] The present invention provides a radioactive waste liquid treatment device, which includes a container and a primary membrane treatment device. Among them, a liquid inlet joint is provided on the container, and one end of the liquid inlet joint is used to connect the radioactive waste liquid; the primary membrane treatment device is arranged in the container, and the primary membrane treatment device includes a first buffer container, a primary membrane assembly and a first booster pump. The waste liquid to be treated is connected to the device through the liquid inlet joint on the container and transported to the first buffer container. The first booster pump transports the waste liquid to be treated in the first buffer container to the primary membrane assembly for separation treatment. In the primary membrane assembly, relying on the selective permeability of the first nanofiltration membrane, the water molecules in the waste liquid pass through the first nanofiltration membrane to become the first dialysate, and the first dialysate is discharged to a designated receiving point through the dialysate discharge pipeline; the radioactive nuclides Sb-125, Ag-110m, etc. in the waste liquid are intercepted by the first nanofiltration membrane, and together with the concentrated liquid, form the first concentrated liquid, and the first concentrated liquid returns to the first buffer container for the next separation treatment until the first concentrated liquid reaches the target multiple. The equipment can effectively purify difficult-to-treat radionuclides such as Sb-125 and Ag-110m in the radioactive waste liquid of nuclear power plants. It has a short treatment cycle, high efficiency and low cost, and can be flexibly moved to different locations for treatment of the units.

[0030] The present invention also provides a method for treating radioactive waste liquid, which uses a primary membrane treatment device to separate and treat the radioactive waste liquid, thereby improving the treatment efficiency of the radioactive waste liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a schematic structural diagram of a radioactive liquid waste treatment device provided by an embodiment of the present invention;

[0032] Figure 2 is a process principle diagram of a radioactive waste liquid treatment device provided by an embodiment of the present invention;

[0033] Figure 3 yes Figure 2 The enlarged view of point A in the middle;

[0034] Figure 4 yes Figure 2 The enlarged view of point B in the middle;

[0035] Figure 5 yes Figure 2 Enlarged view of point C in the middle;

[0036] Figure 6 yes Figure 2 Enlarged view of point D in the middle.

[0037] In the figure:

[0038] 1. Container;

[0039] 21. First buffer container; 211. First inlet; 212. First outlet; 213. Overflow port; 22. Primary membrane assembly; 221. Radioactive waste liquid inlet; 222. First dialysate outlet; 223. First concentrated liquid outlet; 224. First sewage outlet; 23. First booster pump;

[0040] 31. Dialysate discharge pipeline; 32. Dialysate buffer container; 33. Dialysate delivery pump;

[0041] 41. second buffer container; 411. second inlet; 412. third inlet; 413. second outlet; 42. secondary membrane assembly; 421. first concentrated liquid inlet; 422. second dialysate outlet; 423. second concentrated liquid outlet; 424. second sewage outlet; 43. second booster pump; 44. deionized water pipeline; 45. heating element;

[0042] 51. Concentrate discharge pipeline; 52. Transfer barrel; 53. Pneumatic transfer pump;

[0043] 61, first sampling port; 62, second sampling port; 63, third sampling port; 64, fourth sampling port; 65, fifth sampling port; 66, sixth sampling port;

[0044] 7. Flushing pipelines; 8. Chiller; 9. Heat exchanger. DETAILED DESCRIPTION

[0045] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0046] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it 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 elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0048] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0049] Combine the following Figure 1-Figure 6 The technical solution of the present invention is further illustrated through specific implementation methods.

[0050] In order to effectively purify the difficult-to-treat nuclides such as Sb-125 and Ag-110m in the radioactive waste liquid of nuclear power plants, improve the treatment efficiency of radioactive waste liquid, and facilitate the treatment of units in different positions, an embodiment of the present invention provides a radioactive waste liquid treatment device, which includes a container 1 and a primary membrane treatment device. Among them, a liquid inlet connector is provided on the container 1, and one end of the liquid inlet connector is used to connect the radioactive waste liquid; the primary membrane treatment device is arranged in the container 1, and the primary membrane treatment device includes a first buffer container 21, a primary membrane assembly 22 and a first booster pump 23. The first buffer container 21 is provided with a first inlet 211 and a first outlet 212, and the first inlet 211 is connected to the other end of the liquid inlet connector; the primary membrane assembly 22 adopts a first nanofiltration membrane, and the primary membrane assembly 22 has a radioactive waste liquid inlet 221, a first dialysate outlet 222 and a first pressure pump 23. A concentrated liquid outlet 223, a radioactive waste liquid inlet 221 is connected to the first outlet 212, a first dialysate outlet 222 is connected to a dialysate discharge pipeline 31, the first dialysate outlet 222 is used to discharge the first dialysate, and the first concentrated liquid outlet 223 is connected to the first inlet 211 to transport the first concentrated liquid to the first buffer container 21; a first booster pump 23 is arranged between the first buffer container 21 and the primary membrane assembly 22, and the first booster pump 23 is used to transport the radioactive waste liquid in the first buffer container 21 to the primary membrane assembly 22. The equipment can effectively purify the difficult-to-treat nuclides such as Sb-125 and Ag-110m in the radioactive waste liquid of a nuclear power plant, with a short treatment cycle, high efficiency and low cost, and can be flexibly moved to different positions for treatment of the unit.

[0051] refer to Figure 2-Figure 4In detail, the primary membrane treatment device is arranged in the container 1, so that the device can be flexibly moved to different locations when mounted on a vehicle, and then the radioactive waste liquid of the unit can be treated. Moreover, the waste liquid can be removed from the plant after treatment, and does not need to occupy the space in the plant for a long time, which is flexible and convenient to use. The waste liquid to be treated is connected to the device through the liquid inlet connector on the container 1, and is transported to the first buffer container 21 through the first inlet 211. After the first buffer container 21 reaches the target liquid level, the first booster pump 23 transports the waste liquid to be treated in the first buffer container 21 to the primary membrane assembly 22 for separation treatment. In the primary membrane assembly 22, relying on the selective permeability of the first nanofiltration membrane, the water molecules in the waste liquid pass through the first nanofiltration membrane to become the first dialysate, and the first dialysate is discharged to the designated receiving point through the dialysate discharge pipeline 31; the radioactive nuclides Sb-125, Ag-110m, etc. in the waste liquid are intercepted by the first nanofiltration membrane, and together with the concentrated liquid, form the first concentrated liquid, and the first concentrated liquid returns to the first buffer container 21 through the first concentrated liquid outlet 223 and the first inlet 211 for the next separation treatment. At the same time, the waste liquid to be treated continuously enters the first buffer container 21, and the primary membrane assembly 22 continues to separate and purify until the waste liquid of this batch is treated. When the waste liquid to be treated stops being transported to the first buffer container 21, the primary membrane assembly 22 continues to circulate, separate and concentrate until the first concentrated liquid reaches the target multiple, and finally the first concentrated liquid in the first buffer container 21 is transported to the concentrated liquid discharge pipeline 51 through the first outlet 212 for output and the next step of treatment. It should be noted that the concentration multiple of the first concentrated solution can be concentrated as required and is not specifically limited in this embodiment.

[0052] In this embodiment, the primary membrane assembly 22 uses a first nanofiltration membrane with a pore size of 3-5 nm, which can effectively intercept difficult-to-treat nuclides such as Sb-125 and Ag-110m in the radioactive waste liquid, thereby improving the treatment efficiency.

[0053] In order to improve the processing capacity of the radioactive waste liquid treatment equipment, multiple primary membrane assemblies 22 are provided. Specifically, in this embodiment, eight primary membrane assemblies 22 are provided, and the eight primary membrane assemblies 22 are divided into four groups, each group of primary membrane assembly groups is connected in series, and two primary membrane assemblies 22 are provided in each group of primary membrane assembly groups, and the two primary membrane assemblies 22 are connected in parallel. The radioactive waste liquid to be treated is first transported from the first buffer container 21 to the two primary membrane assemblies 22 in the first group of primary membrane assembly groups, and the two primary membrane assemblies 22 can separate and treat part of the radioactive waste liquid, and obtain the first dialysate and the first concentrated liquid. The first dialysate is transported to the dialysate discharge pipeline 31, and the first concentrated liquid flows to the second group of primary membrane assembly groups together with the remaining radioactive waste liquid to be treated. The two primary membrane assemblies 22 in the second group of primary membrane assembly groups are separated and treated, and the third group of primary membrane assembly groups and the fourth group of primary membrane assembly groups repeat the above process. Finally, the first concentrated liquid is transported from the fourth group of primary membrane assembly groups to the first buffer container 21. This arrangement improves the processing capacity of the equipment, thereby improving the processing efficiency. The number and combination of the primary membrane components 22 can be set as required and are not specifically limited here.

[0054] In order to further concentrate the first concentrated liquid, the radioactive waste liquid treatment equipment also includes a secondary membrane treatment device, which is arranged in the container 1 and includes a second buffer container 41, a secondary membrane assembly 42 and a second booster pump 43. The second buffer container 41 is provided with a second inlet 411, a third inlet 412 and a second outlet 413, and the second inlet 411 is connected to the first concentrated liquid outlet 223; the secondary membrane assembly 42 has a first concentrated liquid inlet 421, a second dialysate outlet 422 and a second concentrated liquid outlet 423, the first concentrated liquid inlet 421 is connected to the second outlet 413, the second dialysate outlet 422 is connected to the dialysate discharge pipeline 31, the second dialysate outlet 422 is used to discharge the second dialysate, and the second concentrated liquid outlet 423 is connected to the third inlet 412 to transport the second concentrated liquid to the second buffer container 41; the second booster pump 43 is arranged between the second buffer container 41 and the secondary membrane assembly 42, and the second booster pump 43 is used to transport the first concentrated liquid in the second buffer container 41 to the secondary membrane assembly 42. By setting up a secondary membrane treatment device, a higher multiple of concentrated liquid can be obtained, the amount of waste liquid can be reduced, thereby reducing the output of solid waste, thereby shortening the treatment cycle and reducing costs.

[0055] In this embodiment, the primary membrane treatment device treats a large amount of radioactive waste liquid to be treated, so the first buffer container 21 is set to have a larger volume, and the flow rate of the waste liquid transported by the first booster pump 23 per unit time is also relatively large. When the first concentrated liquid output by the primary membrane treatment device does not reach the target multiple, but the first concentrated liquid is at a relatively low liquid level in the first buffer container 21 after separation and purification, it is difficult to further concentrate the first concentrated liquid in the primary membrane treatment device, and then the first concentrated liquid is transported to the secondary membrane treatment device, and the volume of the second buffer container 41 is set to be smaller than the volume of the first buffer container 21. Specifically, refer to Figure 2 , Figure 5-Figure 6 The secondary membrane assembly 42 uses a second nanofiltration membrane with a pore size of 3-5nm to further separate and concentrate the first concentrated liquid, reduce the amount of waste liquid, and thus reduce the output of solid waste. The first concentrated liquid flows into the second buffer container 41 from the first concentrated liquid outlet 223 on the primary membrane assembly 22, and the second booster pump 43 transports the first concentrated liquid in the second buffer container 41 to the secondary membrane assembly 42 for separation treatment. In the secondary membrane assembly 42, relying on the selective permeability of the second nanofiltration membrane, the water molecules in the first concentrated liquid pass through the second nanofiltration membrane to become the second dialysate, and the second dialysate is discharged to the designated receiving point through the dialysate discharge pipeline 31; the radioactive nuclides Sb-125, Ag-110m, etc. in the waste liquid are intercepted by the second nanofiltration membrane and form the second concentrated liquid together with the concentrated liquid. The second concentrated liquid returns to the second buffer container 41 through the second concentrated liquid outlet 423 and the third inlet 412 for the next separation treatment, and the secondary membrane assembly 42 continues to perform cyclic separation and concentration. When the second concentrated liquid is concentrated to the target multiple, the second concentrated liquid in the second buffer container 41 is finally transported to the concentrated liquid discharge pipeline 51 through the second outlet 413 for output and further processing.

[0056] Furthermore, the secondary membrane treatment device also includes a deionized water pipeline 44, which is connected to the third inlet 412 and is used to transport deionized water to the secondary membrane assembly 42. When the second concentrated liquid is further concentrated, deionized water is added to the second buffer container 41, and the deionized water can elute the second concentrated liquid, and then when the second concentrated liquid enters the secondary membrane assembly 42, more non-radioactive nuclides pass through the second nanofiltration membrane, which is conducive to obtaining a higher multiple of concentrated liquid and reducing the output of waste liquid.

[0057] Optionally, a heating element 45 is provided on the desalted water pipeline 44, and the heating element 45 can heat the desalted water. When the temperature of the desalted water transported by the desalted water pipeline 44 is particularly low, the heating element 45 is provided to heat it, and when the desalted water enters the second buffer container 41, it is beneficial for the desalted water to interact with the second concentrated liquid, thereby obtaining the concentrated liquid with the target multiple more quickly. In this embodiment, the electric heating element 45 is an electric heater.

[0058] Furthermore, the radioactive waste liquid treatment equipment also includes a dialysate buffer container 32, which is connected to the dialysate discharge pipeline 31, and the dialysate buffer container 32 is used to temporarily store the first dialysate and the second dialysate. Specifically, the dialysate discharge pipeline 31 is connected to both the first dialysate outlet 222 and the second dialysate outlet 422, and the first dialysate and the second dialysate are transported to the dialysate buffer container 32 through the dialysate discharge pipeline 31 for temporary storage. After the dialysate buffer container 32 is full, the first dialysate and the second dialysate are discharged to a designated receiving point through the dialysate delivery pump 33.

[0059] Furthermore, the radioactive waste liquid treatment equipment also includes a concentrated liquid discharge pipeline 51, which is connected to both the first outlet 212 and the second outlet 413. After the first concentrated liquid obtained by the primary membrane assembly 22 treatment device reaches the target concentration multiple, it is transported to the concentrated liquid discharge pipeline 51 from the first outlet 212; after the second concentrated liquid obtained by the secondary membrane assembly 42 treatment device reaches the target concentration multiple, it is transported to the concentrated liquid discharge pipeline 51 from the second outlet 413. The output end of the concentrated liquid discharge pipeline 51 is connected to a transfer barrel 52, and the first concentrated liquid and the second concentrated liquid are output by a pneumatic transfer pump 53 after passing through the transfer barrel 52 and undergo the next step of treatment, wherein the pneumatic transfer pump 53 is powered by external compressed air.

[0060] Furthermore, a first sampling port 61 is provided on the dialysate discharge pipeline 31, and the first sampling port 61 is used to sample and analyze the first dialysate, detect the composition of radionuclides in the first dialysate, and determine whether the direct discharge standard is met. Optionally, a second sampling port 62 is also provided on the dialysate discharge pipeline, and the second sampling port 62 is used to sample and analyze the second dialysate, detect the composition of radionuclides in the second dialysate, and determine whether the direct discharge standard is met. And a third sampling port 63 is provided at the output end of the dialysate buffer container 32, and the third sampling port 63 is used to sample and analyze the mixed liquid of the first dialysate and the second dialysate.

[0061] Optionally, a fourth sampling port 64 is provided on the pipeline between the first inlet 211 on the first buffer container 21 and the liquid inlet joint on the container 1, and the fourth sampling port 64 is used to sample and analyze the waste liquid to be treated, and detect the components of nuclides in the waste liquid to be treated. A fifth sampling port 65 is provided at the output end of the first buffer container 21, and the fifth sampling port 65 is used to sample and analyze the first concentrated liquid, and detect whether the concentration multiple of the first concentrated liquid meets the standard. And a sixth sampling port 66 is provided at the output end of the second buffer container 41, and the sixth sampling port 66 is used to sample and analyze the second concentrated liquid, and detect whether the concentration multiple of the second concentrated liquid meets the standard.

[0062] Furthermore, the radioactive waste liquid treatment equipment also includes a flushing pipeline 7, one end of which is connected to the dialysate discharge pipeline 31, and the other end of which is connected to one end of the first buffer container 21 provided with the first inlet 211. The flushing pipeline 7 is used to flush the first buffer container 21, the primary membrane assembly 22, and the connecting pipeline between the first buffer container 21 and the primary membrane assembly 22. Specifically, a first isolation valve is provided on the flushing pipeline 7, and the first isolation valve is used to control the connection and disconnection between the flushing pipeline 7 and the dialysate discharge pipeline 31. The first dialysate flowing out of the primary membrane assembly 22 flows into the flushing pipeline 7 through the dialysate discharge pipeline 31, and the flushing pipeline 7 is connected to the first buffer container 21. The first dialysate circulates between the first buffer container 21 and the primary membrane assembly 22, thereby flushing the first buffer container 21 and the primary membrane assembly 22. After the flushing is completed, the first isolation valve is closed, and the first dialysate flows into the dialysate buffer container 32. The flushing pipeline 7 is arranged to be connected to the dialysate discharge pipeline 31, so that the first dialysate can be reused to avoid waste of resources.

[0063] Furthermore, the radioactive waste liquid treatment equipment also includes a water chiller 8, which is used to cool the primary membrane assembly 22 and the secondary membrane assembly 42. Since the first booster pump 23 and the second booster pump 43 are required to transport the liquid during the separation and purification process of the primary membrane assembly 22 and the secondary membrane assembly 42, the operation of the first booster pump 23 and the second booster pump 43 will increase the temperature of the liquid, thereby causing the temperature in the primary membrane assembly 22 and the secondary membrane assembly 42 to increase. Specifically, the pipeline between the first concentrated liquid outlet 223 and the first inlet 211 is a first concentrated liquid delivery pipeline, which is used to transport the first concentrated liquid to the first buffer container 21. A heat exchanger 9 is provided on the first concentrated liquid delivery pipeline. The water chiller 8 can provide cooling water, and the heat exchanger 9 is connected to the water chiller 8. When it is necessary to cool the primary membrane assembly 22, the water chiller 8 and the heat exchanger 9 are turned on, the first concentrated liquid is cooled when passing through the heat exchanger 9, and the temperature of the first concentrated liquid decreases when entering the first buffer container 21, thereby reducing the temperature in the primary membrane assembly 22. The cooling principle of the secondary membrane assembly 42 is the same as that of the primary membrane assembly 22, and will not be described in detail here. Using the chiller 8 to cool the primary membrane assembly 22 and the secondary membrane assembly 42 can ensure that the first nanofiltration membrane and the second nanofiltration membrane operate within a suitable temperature range, further improving the treatment effect of the waste liquid.

[0064] Furthermore, the equipment is also provided with a maintenance sewage floor drain, which is connected to the chiller 8. When the chiller 8 is overhauled or stopped, the cooling water in the chiller 8 can be discharged to the maintenance sewage floor drain.

[0065] In this embodiment, an overflow port 213 is provided at the top of the first buffer container 21, and the overflow port 213 is connected to the dialysate buffer container 32. When the device is abnormal and the first buffer container 21 is full of liquid, the liquid can flow into the dialysate buffer container 32 through the overflow port 213, thereby preventing the liquid from directly flowing to the ground and causing pollution to the environment.

[0066] Furthermore, a vent hole is provided on the top of the first buffer container 21 , and the vent hole can maintain the pressure in the first buffer container 21 at a stable level.

[0067] Furthermore, a first sewage outlet 224 is provided at the bottom of the primary membrane assembly 22, and a second sewage outlet 424 is provided at the bottom of the secondary membrane assembly 42. After the waste liquid separation and purification treatment is completed, the primary membrane assembly 22 can be emptied through the first sewage outlet 224, and the secondary membrane assembly 42 can be emptied through the second sewage outlet 424, so as to facilitate the next use.

[0068] Furthermore, the container 1 is also provided with a desalted water interface, a dialysate interface and a concentrated liquid interface. The desalted water interface is connected to the desalted water pipeline 44, and the desalted water interface can be directly introduced into the desalted water; the first dialysate and the second dialysate can be directly discharged to a designated location through the dialysate interface; the first concentrated liquid and the second concentrated liquid can be output through the concentrated liquid interface for further processing, and this arrangement facilitates the use of the radioactive waste liquid treatment equipment.

[0069] In this embodiment, the first booster pump 23, the second booster pump 43 and the dialysate delivery pump 33 are all centrifugal pumps, which have a simple structure and are easy to install and maintain. The first booster pump 23 has a flow rate of 26 cubic meters per hour, which can meet the delivery of a large amount of waste liquid to be treated. The second booster pump 43 has a flow rate of 4 cubic meters per hour, which delivers a small volume of the first concentrated liquid for further concentration.

[0070] The radioactive liquid waste treatment equipment also includes a control component, which is electrically connected to the primary membrane treatment device and the secondary membrane treatment device, and the control component is used to control the start and stop of the primary membrane treatment device and the secondary membrane treatment device.

[0071] The embodiment of the present invention also provides a method for treating radioactive liquid waste, which is applicable to a radioactive liquid waste treatment device and includes:

[0072] S1, transporting the radioactive waste liquid to be treated to the first buffer container 21;

[0073] S2, the radioactive waste liquid to be treated in the first buffer container 21 is transported to the primary membrane assembly 22 through the first booster pump 23 for separation treatment, and a first dialysate and a first concentrated liquid are obtained. The first dialysate is discharged to a designated location through the dialysate discharge pipeline 31, and the first concentrated liquid is returned to the first buffer container 21. The first concentrated liquid and the radioactive waste liquid to be treated entering the first buffer container 21 are subjected to the next separation treatment together until the radioactive waste liquid of this batch is transported completely;

[0074] S3. After the radioactive waste liquid is transported, the primary membrane treatment device continues to circulate and separate until the first concentrated liquid reaches the target concentration multiple.

[0075] Specifically, when the waste liquid to be treated stops being transported to the first buffer container 21, the primary membrane assembly 22 continues to circulate, separate and concentrate until the first concentrated liquid reaches the target multiple. When the first concentrated liquid is concentrated to the target multiple, the first concentrated liquid is transported to the concentrated liquid discharge pipeline 51 through the first outlet 212 on the first buffer container 21 for output and the next step of treatment.

[0076] Furthermore, the radioactive liquid waste treatment device further comprises a secondary membrane treatment device, which is capable of separating and treating the first concentrated liquid. The radioactive liquid waste treatment method further comprises:

[0077] S4. Using a secondary membrane treatment device to separate and treat the first concentrated liquid.

[0078] Specifically, when the first concentrated liquid needs to be further concentrated, a secondary membrane treatment device is used. The working principle of the secondary membrane treatment device is the same as that of the primary membrane treatment device, and will not be described in detail here.

[0079] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. Radioactive liquid waste treatment equipment, characterized in that: include: A container (1), wherein the container (1) is provided with a liquid inlet connector, one end of which is used for receiving radioactive waste liquid; A primary membrane treatment device is arranged in the container (1), the primary membrane treatment device comprising a first buffer container (21), a primary membrane assembly (22) and a first booster pump (23), the first buffer container (21) being provided with a first inlet (211) and a first outlet (212), the first inlet (211) being connected to the other end of the liquid inlet joint; the primary membrane assembly (22) adopts a first nanofiltration membrane, the primary membrane assembly (22) having a radioactive waste liquid inlet (221), a first dialysate outlet (222) and a first concentrated liquid outlet (223), the The radioactive waste liquid inlet (221) is connected to the first outlet (212), the first dialysate outlet (222) is connected to the dialysate discharge pipeline (31), the first concentrated liquid outlet (223) is connected to the first inlet (211) to transport the first concentrated liquid to the first buffer container (21), the first booster pump (23) is arranged between the first buffer container (21) and the primary membrane assembly (22), and the first booster pump (23) is used to transport the radioactive waste liquid in the first buffer container (21) to the primary membrane assembly (22).

2. The radioactive liquid waste treatment equipment according to claim 1, characterized in that: The radioactive liquid waste treatment equipment further comprises a secondary membrane treatment device, which is arranged in the container (1) and comprises: a second buffer container (41), wherein the second buffer container (41) is provided with a second inlet (411), a third inlet (412) and a second outlet (413), and the second inlet (411) is communicated with the first concentrated liquid outlet (223); A secondary membrane assembly (42) using a second nanofiltration membrane, the secondary membrane assembly (42) having a first concentrated liquid inlet (421), a second dialysate outlet (422) and a second concentrated liquid outlet (423), the first concentrated liquid inlet (421) being connected to the second outlet (413), the second dialysate outlet (422) being connected to the dialysate discharge pipeline (31), and the second concentrated liquid outlet (423) being connected to the third inlet (412) to transport the second concentrated liquid to the second buffer container (41); The second boost pump (43) is disposed between the second buffer container (41) and the second membrane assembly (42), and the second boost pump (43) is used to transport the first concentrated liquid in the second buffer container (41) to the second membrane assembly (42).

3. The radioactive liquid waste treatment equipment according to claim 2, characterized in that: The secondary membrane treatment device further comprises a desalted water pipeline (44), wherein the desalted water pipeline (44) is in communication with the third inlet (412), and the desalted water pipeline (44) is used to transport desalted water to the secondary membrane assembly (42).

4. The radioactive liquid waste treatment equipment according to claim 3, characterized in that: The desalted water pipeline (44) is provided with a heating element (45), and the heating element (45) is used to heat the desalted water.

5. The radioactive liquid waste treatment equipment according to claim 2, characterized in that: The radioactive waste liquid treatment equipment further comprises a dialysate buffer container (32), wherein the dialysate buffer container (32) is in communication with the dialysate discharge pipeline (31), and the dialysate buffer container (32) is used for temporarily storing the first dialysate and the second dialysate.

6. The radioactive liquid waste treatment equipment according to claim 2, characterized in that: The radioactive liquid waste treatment equipment further comprises a concentrated liquid discharge pipeline (51), wherein the concentrated liquid discharge pipeline (51) is connected to both the first outlet (212) and the second outlet (413).

7. The radioactive liquid waste treatment equipment according to any one of claims 1 to 6, characterized in that: The dialysate discharge pipeline (31) is provided with a first sampling port (61), and the first sampling port (61) is used for sampling and analyzing the first dialysate.

8. The radioactive liquid waste treatment equipment according to any one of claims 1 to 6, characterized in that: The radioactive liquid waste treatment equipment further comprises a flushing pipeline (7), one end of which is in communication with the dialysate discharge pipeline (31), and the other end of which is in communication with one end of the first buffer container (21) at which the first inlet (211) is provided, and the flushing pipeline (7) is used to flush the first buffer container (21), the primary membrane assembly (22), and the connecting pipeline between the first buffer container (21) and the primary membrane assembly (22).

9. A method for treating radioactive liquid waste, applicable to the radioactive liquid waste treatment equipment according to any one of claims 1 to 8, characterized in that: The method for treating radioactive liquid waste comprises: S1, transporting the radioactive waste liquid to the first buffer container (21); S2, transporting the radioactive waste liquid in the first buffer container (21) to the primary membrane assembly (22) for separation treatment, and obtaining the first dialysate and the first concentrated liquid, wherein the first dialysate is discharged to a designated location through the dialysate discharge pipeline (31), and the first concentrated liquid is returned to the first buffer container (21), and the first concentrated liquid is subjected to the next separation treatment together with the radioactive waste liquid entering the first buffer container (21), until the radioactive waste liquid of this batch is transported completely; S3. After the radioactive waste liquid is transported, the primary membrane treatment device continues to circulate and separate until the first concentrated liquid reaches a target concentration multiple.

10. The method for treating radioactive liquid waste according to claim 9, characterized in that: The radioactive liquid waste treatment device further comprises a secondary membrane treatment device, and the secondary membrane treatment device is used to separate and treat the first concentrated liquid. The radioactive liquid waste treatment method further comprises: S4. Using the secondary membrane treatment device to separate and treat the first concentrated liquid.

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