Mobile low-level radioactive wastewater pretreatment device and method

Abstract

The invention discloses the technical field of radioactive wastewater treatment, and particularly relates to a movable type low-level radioactive wastewater pretreatment device and method.The movable type low-level radioactive wastewater pretreatment device comprises a pre-filtering module, a waste liquid conveying pump, a self-cleaning filter and an efficient oil removal filter, the self-cleaning filter is used for removing impurities in radioactive wastewater, and the efficient oil removal filter is used for removing oil in the radioactive wastewater; the efficient oil removal filter is used for removing grease and impurities in radioactive wastewater, the efficient oil removal filter can be used as a supplementary treatment mode of an existing fixed low-level radioactive wastewater treatment process, the efficiency of the original process is improved, the safety storage risk of the low-level radioactive wastewater is reduced, energy is saved, consumption is reduced, equipment is integrated into a standard container, rapid movement is achieved, and operation is convenient. The low-emission wastewater treatment device can meet the requirements of market development, is a mature, effective and convenient treatment device for units without low-emission wastewater treatment processes, and is high in integration level, reasonable in spatial layout, high in decontamination coefficient, low in cost, suitable for various use scenes and suitable for popularization.

Description

Technical Field

[0001] The invention relates to the technical field of radioactive wastewater treatment, and in particular to a mobile low-level radioactive wastewater pretreatment device. Background Art

[0002] The mature and used treatment devices for radioactive wastewater in China mainly include chemical precipitation, evaporation, ion exchange, activated carbon adsorption, etc. The above technologies, when used alone, have defects or deficiencies in terms of scope of application, cost, treatment capacity, treatment effect, etc.

[0003] Chemical precipitation treatment is suitable for treating radioactive wastewater with high salt content and large volume, but its decontamination factor is low, the equipment is large, and it requires more chemical reagents and produces a large amount of secondary waste. It is generally only used for pretreatment, not as the main treatment process; evaporation treatment has good adaptability to most wastewaters, and is still the main means of radioactive wastewater treatment, but it is not suitable for treating wastewater containing foaming and volatile components. The equipment is large, occupies a large area, and has high operating energy consumption, and maintenance and repair are relatively complicated; ion exchange is the most commonly used treatment process for nuclear power plant radioactive wastewater systems, but the resin bed is not suitable for treating wastewater with high salt content or solid content: when there is more salt in the wastewater, the resin will quickly become saturated and fail; when the solid content in the wastewater is high, the resin bed is prone to cause flow blockage, so the wastewater needs to be pretreated at this time; the activated carbon adsorption treatment process is suitable for treating trace organic matter, I and particles. It is a pretreatment method for radioactive wastewater, and the adsorption effect on most radioactive nuclides is poor.

[0004] At present, there are many units in China that generate less radioactive wastewater, such as "radioactive medical institutions, nuclear technology application institutions, and universities." Because these units generate less wastewater, they generally lack independent wastewater treatment facilities and usually store radioactive wastewater in a temporary manner, relying on radioactive wastewater treatment units for treatment. The treatment equipment and devices used in the above-mentioned treatment technologies occupy a large area and are all fixed. In addition to being used for the treatment of radioactive wastewater in the unit itself, it is difficult to provide radioactive wastewater treatment services for the above-mentioned units. Summary of the invention

[0005] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0006] In view of the problems that the above-mentioned existing radioactive wastewater treatment equipment and devices occupy a large area, are all fixed, and the existing radioactive wastewater treatment methods are not suitable for a variety of usage scenarios, the present invention is proposed.

[0007] Therefore, an object of the present invention is to provide a mobile low-level radioactive wastewater pretreatment device.

[0008] To solve the above technical problems, the present invention provides the following technical solutions: a pre-filtration module, including a waste liquid delivery pump, a self-cleaning filter and a high-efficiency oil removal filter, the self-cleaning filter is used to remove impurities in radioactive wastewater, and the high-efficiency oil removal filter is used to remove grease and impurities in radioactive wastewater; an ultrafiltration module, including an ultrafiltration device and an ultrafiltration water tank, the ultrafiltration device is a secondary filtration module; the ultrafiltration module is connected to the pre-filtration module through a stainless steel pipeline, an electric valve, and a manual valve; a reverse osmosis module includes a first RO filter device and a second RO filter device, which are used to remove impurities; a radioactive adsorption module includes an ion exchange bed, which is used to help the treated radioactive wastewater meet the discharge standards.

[0009] As a preferred solution of the mobile low-level radioactive wastewater pretreatment device of the present invention, the waste liquid delivery pump, the self-cleaning filter and the high-efficiency oil removal filter are connected in sequence through a stainless steel pipeline, an electric valve and a manual valve; a waste liquid inlet pipe port is arranged at the front end of the waste liquid delivery pump, and the inlet pipe port is quickly connected to an external waste liquid feed pipe through a quick connector; a pressure sensor, a flow sensor, a pH meter and a conductivity sensor are arranged on the outlet pipeline of the waste liquid delivery pump for monitoring relevant parameters of the wastewater entering the system.

[0010] As a preferred solution of the mobile low-level radioactive wastewater pretreatment device described in the present invention, wherein: a pressure difference sensor is provided on the self-cleaning filter, which is used to detect the pressure of the self-cleaning filter and perform self-cleaning according to the pressure difference; a pressure transmitter is provided at the front end of the high-efficiency oil removal filter, and a pressure gauge is provided on the high-efficiency oil removal filter, which is used to monitor the pressure parameters of the high-efficiency oil removal filter.

[0011] As a preferred solution of the mobile low-level radioactive wastewater pretreatment device of the present invention, the first-level RO device is mainly composed of a first-level RO booster pump, a first-level high-pressure pump, and a first-level RO component. A pressure sensor is arranged on the first-level high-pressure pump, and instruments such as a pressure sensor, an inlet end flow sensor, a conductivity sensor, and an outlet end flow sensor are arranged on the first-level RO component to monitor the inlet end pressure, inlet and outlet flow rates, and conductivity of produced water of the first-level RO component. A RO device venting pipe is arranged at the outlet end of the first-level RO component to vent the residual waste liquid in the reverse osmosis device through an external pipe.

[0012] As a preferred solution of the mobile low-level radioactive wastewater pretreatment device of the present invention, the secondary RO device is composed of a secondary high-pressure pump and a secondary RO component; a pressure sensor and a pH meter are arranged on the secondary high-pressure pump 10; when the pressure is higher than the safety value, the secondary high-pressure pump stops running; when the pressure is lower than the set value, the secondary high-pressure pump starts; a pressure sensor, an inlet end flow sensor, a conductivity sensor, and an outlet end flow sensor are arranged on the secondary RO component to monitor the inlet end pressure, inlet and outlet flow, conductivity of produced water and other related parameters of the secondary RO device; by arranging a RO device venting pipe at the outlet end of the secondary RO device, the residual waste liquid in the reverse osmosis device is vented through an external pipeline.

[0013] As a preferred solution of the mobile low-level radioactive wastewater pretreatment device described in the present invention, the radioactive adsorption module further includes a booster pump, an ion exchange bed, and an air compressor; the radioactive adsorption module is used to monitor the pressure entering the ion exchange bed; a pressure sensor is provided at the rear end of the air compressor to monitor the pressure of the compressed air system; the ion exchange bed is provided with a resin feeding pipe port and a resin discharge pipe port to replace the resin of the ion exchange bed; a conductivity sensor and a flow sensor are provided on the qualified discharge pipeline of the ion exchange bed to monitor the parameters of qualified discharged water.

[0014] As a preferred solution of the mobile low-level radioactive wastewater pretreatment device of the present invention, it further comprises a cleaning module, and the cleaning module is connected with each module through a cleaning pipeline;

[0015] The cleaning module includes a cleaning pump and a pH regulating and dosing device.

[0016] As a preferred solution of the mobile low-level radioactive wastewater pretreatment device described in the present invention, it also includes a dosing module, which is used to adjust the pH value of the wastewater. The dosing module includes a scale inhibitor dosing device, a pH adjustment dosing device stirring motor and a scale inhibitor dosing device stirring motor.

[0017] As a preferred solution of the mobile low-level radioactive wastewater pretreatment device described in the present invention, the surfaces of the membrane elements of the high-efficiency oil removal filter, the ultrafiltration device, and the two-stage reverse osmosis device are flushed with liquid at low pressure and high flow rate to prevent the deposition of these pollutants.

[0018] The beneficial effects of the present invention are as follows: the present invention can be used as a supplementary treatment method for the existing fixed low-level wastewater treatment process, thereby improving the efficiency of the original process, reducing the risk of safe storage of low-level wastewater, saving energy and reducing consumption, and by integrating the equipment into a standard container, quick mobility can be achieved, thereby being able to meet the needs of market development.

[0019] The present invention can be used as an independent low-radioactive wastewater treatment device, providing a mature, effective and convenient treatment device for units that do not have low-radioactive wastewater treatment processes. The present invention has high integration, reasonable spatial layout, high decontamination coefficient, low cost, and is suitable for a variety of usage scenarios and is suitable for promotion.

[0020] In order to solve the above technical problems, the present invention also provides the following technical solutions: a method for pretreating radioactive wastewater, comprising the mobile low-level radioactive wastewater pretreatment device, and,

[0021] Select the automatic mode through the control panel and start the device;

[0022] First, run the pre-filtration module and the ultrafiltration module to temporarily store the generated ultrafiltration water in the ultrafiltration water tank;

[0023] Monitor the liquid level of the ultrafiltration water tank. When the liquid level reaches the preset high level, the operation of the pre-filtration module and the ultrafiltration module will be automatically stopped and an alarm signal will be issued;

[0024] Automatically start the secondary reverse osmosis module and the radioactive adsorption module to further process the ultrafiltration water in the ultrafiltration water tank;

[0025] When the liquid level of the ultrafiltration water tank drops to the preset middle liquid level, the pre-filtration module and the ultrafiltration module are started again to collect the ultrafiltration water;

[0026] When the liquid level of the ultrafiltration water tank reaches the preset high liquid level again, the water storage operation of the ultrafiltration water tank is stopped;

[0027] When the ultrafiltration water tank cannot be automatically replenished and the liquid level drops to the preset low level, the operation of the secondary reverse osmosis module and the radioactive adsorption module will be automatically stopped;

[0028] After the device automatically runs for a preset period of time, the device is stopped through the control panel. After the device completely stops running, the power is turned off and all manual valves return to their initial closed state.

[0029] Beneficial effects of the present invention: The present invention adopts "membrane filtration + reverse osmosis + ion exchange" technology to effectively separate radioactive substances and other pollutants in wastewater and achieve effective volume reduction. It filters out harmful substances in wastewater through a precise membrane pore structure and retains recyclable resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0031] Figure 1 This is a simplified process diagram of a mobile low-level radioactive wastewater pretreatment device.

[0032] Figure 2 This is the process flow chart of the mobile low-level radioactive wastewater pretreatment device.

[0033] Figure 3 Scale-up of the process for mobile low-level radioactive wastewater pretreatment unit Figure 1 .

[0034] Figure 4 Scale-up of the process for mobile low-level radioactive wastewater pretreatment unit Figure 2 .

[0035] Figure 5 Scale-up of the process for mobile low-level radioactive wastewater pretreatment unit Figure 3 .

[0036] Figure 6 Scale-up of the process for mobile low-level radioactive wastewater pretreatment unit Figure 4 .

[0037] Figure 7 A color 3D view of the mobile low-level radioactive wastewater pretreatment unit.

[0038] Figure 8 A color 3D view of the mobile low-level radioactive wastewater pretreatment unit.

[0039] Fig. 9 A color 3D view of the mobile low-level radioactive wastewater pretreatment unit.

[0040] Fig.10 This is an overhead view of the mobile low-level radioactive wastewater pretreatment device.

[0041] Fig.11 This is an overhead view of the mobile low-level radioactive wastewater pretreatment device.

[0042] Fig.12 This is the rear view of the mobile low-level radioactive wastewater pretreatment device.

[0043] Fig.13 This is a front view of the mobile low-level radioactive wastewater pretreatment device.

[0044] In the figure: 1. Waste liquid delivery pump; 2. Self-cleaning filter; 3. High-efficiency oil removal filter; 4. Ultrafiltration device; 5. Ion exchange bed; 6. Primary RO component; 7. Secondary RO component; 8. Primary RO booster pump; 9. Primary high-pressure pump; 10. Secondary high-pressure pump; 11. Booster pump; 12. Cleaning pump; 13. Ultrafiltration water tank; 14. Magnetic flap level gauge; 15. Antiscalant dosing device; 16. PH adjustment dosing device; 17. Container body; 18. Air compressor; 19. Container corner fittings; 20. RO device venting nozzle; 21. UF water tank drain nozzle; 22. Waste liquid inlet nozzle; 23. Ion exchange bed discharge nozzle; 24. Residual liquid reflux nozzle; 25. Tap water inlet nozzle; 26. Resin feeding nozzle; 27. Resin discharge nozzle; 28. PH adjustment dosing device stirring motor; 29. ​​Antiscalant dosing device stirring motor; 30. Self-cleaning filter centrifugal motor; 31. Electric valve; 32. Flow meter; 33. Manual valve. DETAILED DESCRIPTION

[0045] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0046] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0047] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0048] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0049] Example 1, reference Figure 1 to Figure 2, which is the first embodiment of the present invention, provides a mobile low-level radioactive wastewater pretreatment device, including a pre-filtration module, including a waste liquid delivery pump 1, a self-cleaning filter 2 and a high-efficiency oil removal filter 3. The self-cleaning filter 2 is a primary filter, and has a built-in coarse filter element component, a fine filter mesh and a centrifugal flushing device, which is used to remove impurities, particulate matter, floating objects, etc. in the radioactive wastewater, and has an automatic sewage discharge function. The high-efficiency oil removal filter 3 is a filter with ultra-fine pore filter tubes as the main filter material, which is used to remove grease and impurities in the radioactive wastewater;

[0050] The ultrafiltration module includes an ultrafiltration device 4 and an ultrafiltration water tank 13. The ultrafiltration device 4 is for secondary filtration. The membrane fibers of the ultrafiltration membrane are hollow fiber membranes. The membrane fibers are made of PVDF material and have an asymmetric porous structure that is interconnected inside, so that the water flux of the hydrophilic hollow fiber membrane becomes larger. It can separate the fluid into two different parts, so that one or several substances can pass through, while other substances are separated. The ultrafiltration module is connected to the pre-filtration module through a stainless steel pipeline, an electric valve 31, and a manual valve 33. The two modules mainly use pretreatment technology;

[0051] It should be noted that a pressure sensor and a flow meter 32 are provided on the ultrafiltration device 4 for monitoring relevant parameters of the ultrafiltration device 4; a magnetic flap level gauge 14 is provided on the ultrafiltration water tank 13, which can directly read the liquid level of the ultrafiltration water tank 13; an ultrafiltration water tank 13 drain pipe is provided at the bottom of the ultrafiltration water tank 13, which can be connected to an external pipeline to drain the residual liquid inside the ultrafiltration water tank 13. The ultrafiltration water tank 13 is provided with three liquid level sensors, namely, low, medium and high. When the liquid level in the ultrafiltration water tank 13 is at a low level, the waste liquid delivery pump 1 is started to store water in the ultrafiltration water tank 13, the first-level RO booster pump 8 and the first-level high-pressure pump 9 are not started, and the subsequent processing module is not operated; when the liquid level in the ultrafiltration water tank 13 reaches a medium level, the waste liquid delivery pump 1 is started to store water in the ultrafiltration water tank 13, the first-level RO booster pump 8 and the first-level high-pressure pump 9 are started, and the subsequent processing module is operated; when the liquid level in the ultrafiltration water tank 13 reaches a high level, the waste liquid delivery pump 1 is stopped, no water is stored in the ultrafiltration water tank 13, the first-level RO booster pump 8 and the first-level high-pressure pump 9 are started, and the subsequent processing module is operated.

[0052] The reverse osmosis module includes a first RO filter device and a second RO filter device, which are used to remove impurities. The selective permeability of the semipermeable membrane is used to separate the solvent from the solute in the solution under the drive of the pressure difference, which can effectively remove impurities such as dissolved salts, radionuclides, and organic matter in the wastewater, thereby obtaining high-quality purified water.

[0053] The radioactive adsorption module includes an ion exchange bed 5, which removes the residual radioactive nuclides from the reverse osmosis through the adsorption of a polishing resin bed equipped with a nuclear grade resin to ensure that the treated radioactive wastewater meets the discharge standards.

[0054] Specifically, the waste liquid delivery pump 1, the self-cleaning filter 2 and the high-efficiency oil removal filter 3 are connected in sequence through a stainless steel pipeline, an electric valve 31 and a manual valve 33;

[0055] A waste liquid inlet pipe opening 22 is provided at the front end of the waste liquid delivery pump 1, and the inlet pipe opening is quickly connected to an external waste liquid supply pipe through a quick connector;

[0056] The outlet pipeline of the waste liquid delivery pump 1 is provided with instruments such as a pressure sensor, a flow sensor, a pH meter, and a conductivity sensor, which are used to monitor the relevant parameters of the waste water entering the system.

[0057] Among them, a pressure difference sensor is provided on the self-cleaning filter 2, which is used to detect the pressure of the self-cleaning filter 2 and perform self-cleaning according to the pressure difference;

[0058] A pressure transmitter is arranged at the front end of the high-efficiency oil removal filter 3 , and a pressure gauge is arranged on the high-efficiency oil removal filter 3 to monitor the pressure parameters of the high-efficiency oil removal filter 3 .

[0059] Furthermore, the primary RO device is mainly composed of a primary RO booster pump 8, a primary high-pressure pump 9, and a primary RO component 6. A pressure sensor is arranged on the primary high-pressure pump 9. When the pressure is higher than the safety value, the primary high-pressure pump 9 stops running. When the pressure is lower than the set value, the primary high-pressure pump 9 starts. The primary RO component 6 is provided with instruments such as a pressure sensor, an inlet end flow sensor, a conductivity sensor, and an outlet end flow sensor for monitoring the inlet end pressure, inlet and outlet flow rates, and conductivity of produced water of the primary RO component 6. An RO device venting pipe 20 is arranged at the outlet end of the primary RO component 6 to vent the residual waste liquid in the reverse osmosis device through an external pipeline.

[0060] Furthermore, the secondary RO device is composed of a secondary high-pressure pump 10 and a secondary RO (reverse osmosis) component; a pressure sensor and a pH meter are arranged on the secondary high-pressure pump 10. When the pressure is higher than the safety value, the secondary high-pressure pump 10 stops running, and when the pressure is lower than the set value, the secondary high-pressure pump 10 starts. A pressure sensor, an inlet end flow sensor, a conductivity sensor, an outlet end flow sensor and other instruments are arranged on the secondary RO component 7 to monitor the inlet end pressure, inlet and outlet flow, conductivity of produced water and other related parameters of the secondary RO device. By arranging an RO device vent pipe 20 at the outlet end of the secondary RO device, the residual waste liquid in the reverse osmosis device is vented through an external pipeline.

[0061] Furthermore, the radioactive adsorption module is composed of a booster pump 11, an ion exchange bed 5, and an air compressor 18 in addition to the ion exchange bed 5. A pressure transmitter is provided at the rear end of the booster pump 11, and the booster pump 11 is used to monitor the pressure entering the ion exchange bed 5;

[0062] A pressure sensor is provided at the rear end of the air compressor 18 to monitor the pressure of the compressed air system;

[0063] The ion exchange bed 5 is provided with a resin feeding pipe port 26 and a resin discharge pipe port 27 for replacing the resin of the ion exchange bed 5. The qualified discharge pipeline of the ion exchange bed 5 is provided with a conductivity sensor and a flow sensor for monitoring relevant parameters of qualified discharge water.

[0064] It should be noted that the present invention uses a combination of "pretreatment + reverse osmosis + ion exchange" to treat wastewater with low radioactivity levels, making up for the technical defects of single technology in treating radioactive wastewater. Pretreatment technology can remove impurities such as suspended matter, colloidal particles, microorganisms, and oily substances in radioactive wastewater; reverse osmosis technology removes radioactive nuclides and most salts in ionized form in radioactive wastewater; ion exchange technology removes radioactive nuclides remaining in reverse osmosis. Through the three combined application technologies, radioactive wastewater is purified, the volume of wastewater is reduced, and it is ensured that the treated radioactive wastewater can meet the discharge standards.

[0065] The main functional modules of the technology adopted by the present invention include a pre-filtration module, an ultrafiltration module, a primary reverse osmosis module, a secondary reverse osmosis module, a radioactive adsorption module, a dosing module, and an automatic backwashing module. The pretreatment module consists of two modules, a pre-filtration module and an ultrafiltration module, including a wastewater delivery pump, a self-cleaning filter 2, a high-efficiency oil removal filter 3, an ultrafiltration device 4, and an ultrafiltration water tank 13; the reverse osmosis module consists of a primary high-pressure pump 9, a primary reverse osmosis, a secondary high-pressure pump 10, and a secondary reverse osmosis; the radioactive adsorption module consists of a booster pump 11 and an ion exchange bed 5; the dosing module consists of a scale inhibitor dosing device 15 and a pH adjustment dosing device 16; the automatic backwashing module is mainly composed of a cleaning pump 12 and its control system.

[0066] The radioactive wastewater is filtered and purified by the pretreatment module, and the wastewater treated by the high-efficiency oil removal filter 3 enters the ultrafiltration filter to further remove organic matter, metal ions, colloidal radionuclides, etc. in the water; secondly, the wastewater after the pretreatment module is pressurized by the first-level high-pressure pump 9 to enter the first-level reverse osmosis filtration, and the first-level reverse osmosis product water is pressurized by the second-level high-pressure pump 10 to enter the second-level reverse osmosis filtration, and the second-level reverse osmosis product water meets the standards and is directly discharged; at the same time, an automatic backwashing module is equipped to automatically backwash the ultrafiltration, first-level, second-level reverse osmosis and pipelines. The water after reverse osmosis filtration is pressurized by the booster pump 11 to the ion exchange bed 5, and the polishing resin bed exchanges the radioactive nuclide ions with the resin to further remove the radioactive nuclides in the wastewater, ensuring that the entire system has stable water discharge that meets the standards.

[0067] The radioactive wastewater is transported to the self-cleaning filter 2 and the high-efficiency oil removal filter 3 by the wastewater delivery pump. After removing impurities such as suspended matter, colloidal particles, microorganisms and oil-containing substances in the wastewater, it enters the ultrafiltration device 4. After removing organic matter, metal ions and radionuclides in colloidal state, it enters the ultrafiltration water tank 13. Then it enters the primary reverse osmosis device through the primary booster pump and the primary high-pressure pump 9, and then enters the secondary reverse osmosis device through the secondary high-pressure pump 10. The secondary reverse osmosis concentrated water returns to the ultrafiltration water tank 13 for circulation purification. The water produced by the secondary reverse osmosis device is sampled and analyzed. If the water is qualified, it is discharged in compliance with the standards; if the water is unqualified, it enters the ion exchange bed 5 through the booster pump 11 for adsorption treatment. The water produced by the ion exchange bed 5 is sampled and analyzed. If the water is unqualified, it is returned to the wastewater collection pool. If the water is qualified, it is discharged in compliance with the standards.

[0068] Example 2, reference Figures 3 to 6 , this embodiment is different from the first embodiment in that: it also includes a cleaning module, and the cleaning module is connected with each module through a cleaning pipeline;

[0069] The cleaning module includes a cleaning pump 12 and a PH regulating and dosing device 16. Tap water is added into the medicine box through the tap water inlet pipe 25. By controlling the switches of the relevant electric valves 31 and manual valves 33, the cleaning of each module is achieved. The cleaning water of the two-stage reverse osmosis component flows back to the ultrafiltration water tank 13 through the cleaning pipeline, and the cleaning water of the ultrafiltration device 4, the high-efficiency oil removal filter 3, and the self-cleaning filter 2 flows back to the wastewater feed tank through the residual liquid reflux pipe 24.

[0070] Specifically, it also includes a dosing module, which is used to adjust the pH value of the wastewater. The dosing module includes an antiscalant dosing device 15, a stirring motor for the pH regulating dosing device, and a stirring motor for the antiscalant dosing device 15. The suction port of the first-level high-pressure pump 9 of the membrane filtration module of the device is connected to the antiscalant dosing device 15 through a corresponding pipeline to prevent the reverse osmosis membrane from scaling. The front end of the secondary RO (reverse osmosis) device of the device is connected to the pH regulating dosing device 16 through a corresponding pipeline to adjust the pH of the wastewater.

[0071] Furthermore, the surfaces of the membrane elements of the high-efficiency oil removal filter 3, the ultrafiltration device 4, and the two-stage reverse osmosis device are flushed at low pressure and high flow rate by liquid such as tap water to prevent the deposition of these pollutants.

[0072] The rest of the structure is the same as that of Example 1.

[0073] It should be noted that a scale inhibitor dosing pipeline is provided at the rear end of the ultrafiltration water tank 13, and a scale inhibitor is added to the system through a scale inhibitor dosing device 15 to alleviate the scaling tendency of the RO (reverse osmosis) system during operation, thereby reducing the degree of membrane damage during long-term operation. A PH regulator dosing pipeline is provided at the rear end of the primary reverse osmosis device, and a PH regulator is added to the system through a PH regulator dosing device 16 to adjust the acidity and alkalinity of the wastewater.

[0074] A cleaning pump 12 is provided in the system to use tap water to perform low-pressure and high-flow flushing on the surfaces of the membrane elements of the high-efficiency oil removal filter 3, the ultrafiltration device 4, and the two-stage reverse osmosis device, thereby preventing the deposition of these pollutants, effectively reducing the pollution rate, and extending the chemical cleaning cycle.

[0075] Example 3, reference Figures 1 to 9 , this embodiment is different from the above embodiments in that this embodiment provides a mobile low-level radioactive wastewater pretreatment method, including,

[0076] 1) Connect drainage plastic hoses to the waste liquid inlet pipe 22, the RO device vent pipe 20, the ion exchange bed 5 discharge pipe 23, and the residual liquid reflux pipe 24 respectively. The other end of the plastic hose is connected to a temporary water tank to collect the production water in the exhaust process and flow it back to the temporary water receiving container.

[0077] 2) Set the low liquid level, middle liquid level and high liquid level limit values ​​of the ultrafiltration water tank 13 on the device operation screen to interlock with the front-end waste liquid delivery pump 1, the first-stage RO booster pump 8 and the first-stage high-pressure pump 9.

[0078] 3) Turn on the "power" switch, start the control system, exhaust system, and video surveillance system, and confirm that all systems are operating normally.

[0079] 4) First select manual mode on the operation screen;

[0080] 5) Water storage operation of the ultrafiltration water tank 13: Manually open the manual outlet valve of the waste liquid delivery pump 1, the manual inlet valve of the self-cleaning filter 2, and the manual valve 33 for concentrated water return of the ultrafiltration device 4.

[0081] 6) Open the concentrated water outlet valve of the self-cleaning filter 2 and the concentrated water reflux valve of the ultrafiltration device 4, start the waste liquid delivery pump 1, open the outlet valve of the self-cleaning filter 2, the inlet valve of the ultrafiltration device 4, and the inlet valve of the ultrafiltration water tank 13, and close the concentrated water outlet valve of the self-cleaning filter 2 and the concentrated water reflux valve of the ultrafiltration device 4.

[0082] 7) The water produced by the ultrafiltration device 4 enters the ultrafiltration water tank 13, and the concentrated water of the ultrafiltration device 4 flows back to the temporary water receiving container;

[0083] 8) The ultrafiltration water tank 13 stores water, and when the liquid level basically reaches the set high liquid level, the waste liquid delivery pump 1 is manually stopped.

[0084] 9) Ultrafiltration water purification operation (two-stage RO + ion exchange): manually open the manual inlet valve of the first-stage RO booster pump 8, the manual outlet valve of the first-stage booster pump, the manual outlet valve of the first-stage RO component 6, the manual control valve of the water produced by the second-stage RO component 7 to the ultrafiltration water tank 13, the discharge valve of the water produced by the second-stage RO component 7 to the ion exchange bed 5, and the manual outlet valve of the ion exchange booster pump 11;

[0085] 10) Open the outlet valve of the first-stage high-pressure pump 9, the outlet valve of the first-stage RO component 6, the exhaust valve of the first-stage RO component 6 (external cleaning water interface valve), the outlet valve of the second-stage high-pressure pump 10, the exhaust valve of the second-stage RO component 7 (external cleaning water interface valve), and the control valve for the water produced by the second-stage RO component 7 to the ultrafiltration device 4, start the first-stage RO booster pump 8, and after 5 seconds, start the first-stage high-pressure pump 9 and the second-stage high-pressure pump 10. After 15 seconds of starting the second-stage high-pressure pump 10, close the exhaust valve of the first-stage RO component 6 (external cleaning water interface valve), the exhaust valve of the second-stage RO component 7 (external cleaning water interface valve), and the control valve for the water produced by the second-stage RO component 7 to the ultrafiltration device 4.

[0086] 11) Open the manual outlet valve of the antiscalant dosing device 15 and start the antiscalant dosing pump.

[0087] 12) Open the inlet valve of the ion exchange booster pump 11, open the inlet valve of the ion exchange bed 5, the outlet valve of the ion exchange bed 5, and the unqualified reflux valve of the ion exchange bed 5.

[0088] 13) Start the ion exchange booster pump 11, and the produced water flows back to the temporary water tank from the discharge pipe port 23 of the ion exchange bed 5 through the pipeline.

[0089] 14) After a period of reflux, open the qualified discharge valve of ion exchange bed 5, close the unqualified reflux valve of ion exchange bed 5, and the produced water flows back to the temporary water tank through the pipeline.

[0090] 15) When the ultrafiltration water tank 13 reaches the set middle liquid level, repeat 3)-6) above-mentioned "ultrafiltration water tank 13 water storage operation". After reaching the high liquid level, stop the water storage operation. During the water storage process, the entire ultrafiltration water purification operation continues to run.

[0091] 16) Repeat the above steps until the low-level radioactive wastewater treatment is completed, click the "Stop" button on the PLC control panel, turn off all pumps, power off the device, and restore all manual valves 33 to their initial closed state.

[0092] It should be noted that all system modules of the present invention adopt a modular, integrated and miniaturized manner so that relevant equipment and facilities can be installed in a standard container, and radioactive wastewater treatment can be achieved through the coordinated operation of various systems and modules, thereby solving the problem of being unable to perform radioactive wastewater pretreatment within the unit due to site limitations.

[0093] The rest of the structure is the same as that of Example 2.

[0094] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and ratio of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangement, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or device step can be changed or reordered according to an alternative embodiment. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0095] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0096] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0097] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A mobile low-level radioactive wastewater pretreatment device, characterized in that: include, The pre-filtration module comprises a waste liquid delivery pump (1), a self-cleaning filter (2) and a high-efficiency oil removal filter (3), wherein the self-cleaning filter (2) is used to remove impurities in the radioactive waste water, and the high-efficiency oil removal filter (3) is used to remove grease and impurities in the radioactive waste water; An ultrafiltration module, comprising an ultrafiltration device (4) and an ultrafiltration water tank (13), wherein the ultrafiltration device (4) is used for secondary filtration, and the ultrafiltration module is connected to the pre-filtration module via a stainless steel pipeline, an electric valve (31), and a manual valve (33); A reverse osmosis module, including a first RO filter device and a second RO filter device, for removing impurities; The radioactive adsorption module includes an ion exchange bed (5) and is used to help the treated radioactive wastewater meet the discharge standards.

2. The mobile low-level radioactive wastewater pretreatment device according to claim 1, characterized in that: The waste liquid delivery pump (1), the self-cleaning filter (2) and the high-efficiency oil removal filter (3) are connected in sequence through a stainless steel pipeline, an electric valve (31) and a manual valve (33); The front end of the waste liquid delivery pump (1) is provided with a waste liquid inlet pipe opening (22), and the inlet pipe opening is quickly connected to an external waste liquid supply pipe through a quick connector; The outlet pipeline of the waste liquid delivery pump (1) is provided with a pressure sensor, a flow sensor, a pH meter, and a conductivity sensor for monitoring relevant parameters of the waste water entering the system.

3. The mobile low-level radioactive wastewater pretreatment device according to claim 2, characterized in that: The self-cleaning filter (2) is provided with a pressure difference sensor for detecting the pressure of the self-cleaning filter (2) and performing self-cleaning according to the pressure difference; A pressure transmitter is provided at the front end of the high-efficiency oil removal filter (3), and a pressure gauge is provided on the high-efficiency oil removal filter (3) for monitoring the pressure parameters of the high-efficiency oil removal filter (3).

4. The mobile low-level radioactive wastewater pretreatment device according to claim 3, characterized in that: The primary RO device mainly comprises a primary RO booster pump (8), a primary high-pressure pump (9), and a primary RO component (6). The primary high-pressure pump (9) is provided with a pressure sensor. The primary RO component (6) is provided with a pressure sensor, an inlet end flow sensor, a conductivity sensor, and an outlet end flow sensor for monitoring the inlet end pressure, inlet and outlet flow rates, and conductivity of produced water of the primary RO component (6). The outlet end of the primary RO component (6) is provided with an RO device venting pipe (20) for venting residual waste liquid in the reverse osmosis device through an external pipe.

5. The mobile low-level radioactive wastewater pretreatment device according to claim 4, characterized in that: The secondary RO device is composed of a secondary high-pressure pump (10) and a secondary RO component (7); a pressure sensor and a pH meter are arranged on the secondary high-pressure pump (10); when the pressure is higher than a safety value, the secondary high-pressure pump (10) stops running; when the pressure is lower than a set value, the secondary high-pressure pump (10) starts; a pressure sensor, an inlet end flow sensor, a conductivity sensor, an outlet end flow sensor and other instruments are arranged on the secondary RO component (7) for monitoring relevant parameters such as the inlet end pressure, inlet and outlet flow, and conductivity of produced water of the secondary RO device; and an RO device venting pipe (20) is arranged at the outlet end of the secondary RO device to vent the residual waste liquid in the reverse osmosis device through an external pipeline.

6. The mobile low-level radioactive wastewater pretreatment device according to claim 5, characterized in that: The radioactive adsorption module further comprises a booster pump (11), an ion exchange bed (5), and an air compressor (18), and the radioactive adsorption module is used to monitor the pressure entering the ion exchange bed (5); A pressure sensor is provided at the rear end of the air compressor (18) for monitoring the pressure of the compressed air system; The ion exchange bed (5) is provided with a resin feeding pipe opening (26) and a resin discharge pipe opening (27) for replacing the resin of the ion exchange bed (5). The qualified discharge pipeline of the ion exchange bed (5) is provided with a conductivity sensor and a flow sensor for monitoring the parameters of qualified discharge water.

7. The mobile low-level radioactive wastewater pretreatment device according to claim 6, characterized in that: It also includes a cleaning module, which is connected to each module through a cleaning pipeline; The cleaning module comprises a cleaning pump (12) and a pH regulating and dosing device (16).

8. The mobile low-level radioactive wastewater pretreatment device according to claim 7, characterized in that: It also includes a dosing module, which is used to adjust the pH value of the wastewater. The dosing module includes an antiscalant dosing device (15), a stirring motor for the pH regulating dosing device (16), and a stirring motor for the antiscalant dosing device (15).

9. The mobile low-level radioactive wastewater pretreatment device according to claim 8, characterized in that: The surfaces of the membrane elements of the high-efficiency oil removal filter (3), the ultrafiltration device (4), and the two-stage reverse osmosis device are flushed at low pressure and high flow rate by liquid to prevent the deposition of these pollutants.

10. A method for pretreatment of radioactive wastewater, characterized in that: A mobile low-level radioactive wastewater pretreatment device comprising any one of claims 1 to 9, and Select the automatic mode through the control panel and start the device; First, the pre-filtration module and the ultrafiltration module are operated to temporarily store the generated ultrafiltration water in the ultrafiltration water tank (13); Monitoring the liquid level of the ultrafiltration water tank (13), when the liquid level reaches a preset high liquid level, automatically stopping the operation of the pre-filtration module and the ultrafiltration module, and issuing an alarm signal; Automatically start the secondary reverse osmosis module and the radioactive adsorption module to further process the ultrafiltration water in the ultrafiltration water tank (13); When the liquid level of the ultrafiltration water tank (13) drops to a preset middle liquid level, the pre-filtration module and the ultrafiltration module are started again to collect the ultrafiltration water; When the liquid level of the ultrafiltration water tank (13) reaches the preset high liquid level again, the water storage operation of the ultrafiltration water tank (13) is stopped; When the ultrafiltration water tank (13) cannot be automatically replenished with water so that the liquid level drops to a preset low liquid level, the operation of the secondary reverse osmosis module and the radioactive adsorption module is automatically stopped; After the device automatically runs for a preset period of time, the device is stopped through the control panel. After the device completely stops running, the power supply is turned off and all manual valves (33) are restored to their initial closed state.

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