CN115745271A - Chemical decontamination waste liquid treatment system and method for nuclear power plant - Google Patents
Chemical decontamination waste liquid treatment system and method for nuclear power plant Download PDFInfo
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- CN115745271A CN115745271A CN202211474496.7A CN202211474496A CN115745271A CN 115745271 A CN115745271 A CN 115745271A CN 202211474496 A CN202211474496 A CN 202211474496A CN 115745271 A CN115745271 A CN 115745271A
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Abstract
The invention discloses a chemical decontamination waste liquid treatment system and method for a nuclear power plant, and relates to a system and method for treating nuclear waste liquid. The chemical decontamination waste liquid treatment system and the chemical decontamination waste liquid treatment method for the nuclear power plant can solve the problems of pollution blockage and poisoning of a main treatment unit and avoid secondary radioactive waste liquid generation. The chemical decontamination waste liquid treatment system for the nuclear power plant comprises a pretreatment unit, a fixing unit and a deep purification unit, wherein the pretreatment unit comprises an iron removal device and an organic matter removal device which are connected; the fixed unit is provided with an ion exchange bed, and the deep purification unit comprises a reverse osmosis device and a fine treatment membrane pile which are connected. According to the invention, an accurate treatment process is set according to the condition of the waste liquid, so that the pollution blockage and poisoning of the main treatment unit are prevented, and the operation and maintenance cost of the main treatment unit is reduced; in the invention, no secondary radioactive waste liquid is generated; wherein, the resin, the membrane element, the filter element and the like can be treated by adopting the original solid waste treatment process of the power plant.
Description
Technical Field
The invention relates to the technical field of waste liquid treatment, in particular to a system and a method for treating chemical decontamination waste liquid of a nuclear power plant.
Background
In order to better decontaminate the radioactive contamination parts during routine maintenance of the nuclear power plant, chemical methods are generally used, such as adding chemical agents like acids, bases, citric acid, detergents, etc. In the decontamination process, a certain amount of chemical decontamination waste liquid is generated, the chemical decontamination waste liquid has complex components, contains chemical substances such as cleaning agents, complexing agents, acid and alkali and the like besides radioactive nuclide, and contains a certain amount of organic matters, and the waste liquid can be discharged only after being treated to meet relevant discharge standards.
The chemical decontamination waste liquid is treated by the nuclear power plant in China in an evaporation mode, but the system is complex and the energy consumption is high; or in order to meet the requirement of waste minimization management, the nuclear power plant adopts a mobile waste liquid treatment device to treat chemical decontamination waste liquid generated in a chemical decontamination and thermal maintenance workshop of the nuclear power plant. However, the mobile waste liquid treatment device has certain applicability requirements for the input source item of the chemical decontamination waste liquid.
Iron or organic matters in the waste liquid can cause poisoning or dirt blockage on the resin and the membrane element, and irreversible damage can be formed; the surface of the ion exchange resin is covered by iron compounds or the exchange pore channels in the resin are blocked by iron impurities and the like, so that the working exchange capacity and the regeneration exchange capacity of the resin are obviously reduced, and the iron of the resin is poisoned.
Therefore, it is necessary to find a suitable and effective treatment process for the decontamination waste liquid of nuclear power plant, which can not only avoid the above-mentioned problems, but also effectively reduce the activity and the content of secondary radioactive solids.
Disclosure of Invention
The invention aims to solve the technical problem of providing a system and a method for treating chemical decontamination waste liquid of a nuclear power plant, which can solve the problem of pollution blockage and poisoning of a main treatment unit and avoid the generation of secondary radioactive waste liquid.
According to one technical scheme, the chemical decontamination waste liquid treatment system for the nuclear power plant comprises a pretreatment unit, a fixing unit and a deep purification unit, wherein the pretreatment unit comprises an iron removal device and an organic matter removal device which are connected; the fixed unit is provided with an ion exchange bed, and the deep purification unit comprises a reverse osmosis device and a fine treatment membrane pile which are connected.
The invention discloses a chemical decontamination waste liquid treatment system for a nuclear power plant, wherein a deironing device comprises an aeration fan, a first circulating water tank and a first precision filter, wherein the aeration fan sends air into the first circulating water tank, and a water outlet of the first circulating water tank is connected with the first precision filter.
The chemical decontamination waste liquid treatment system for the nuclear power plant comprises a second circulating water tank and an advanced oxidation reactor, wherein a liquid inlet of the second circulating water tank is connected with a hydrogen peroxide storage tank, and a water outlet of the second circulating water tank is connected with the advanced oxidation reactor.
The invention relates to a chemical decontamination waste liquid treatment system for a nuclear power plant, wherein a fixed unit comprises an intermediate water tank, a water outlet of the intermediate water tank is connected with an ion exchange bed, and the ion exchange bed is connected with a reverse osmosis device.
The invention discloses a chemical decontamination waste liquid treatment system for a nuclear power plant, wherein a second precision filter is arranged between an intermediate water tank and an ion exchange bed.
The chemical decontamination waste liquid treatment system for the nuclear power plant comprises a reverse osmosis water supply tank, wherein a water outlet of the reverse osmosis water supply tank is connected with a first-stage reverse osmosis membrane, a water outlet of the first-stage reverse osmosis membrane is connected with a second-stage reverse osmosis membrane, and a water outlet of the second-stage reverse osmosis membrane is connected with a reverse osmosis water production tank.
The chemical decontamination waste liquid treatment system for the nuclear power plant is characterized in that a concentrated liquid port of the first-stage reverse osmosis membrane is connected with a middle water tank of the fixed unit, and a concentrated liquid port of the second-stage reverse osmosis membrane is connected with a reverse osmosis water supply tank.
The invention relates to a chemical decontamination waste liquid treatment system for a nuclear power plant, wherein a continuous electric desalting membrane stack is selected as a fine treatment membrane stack.
According to another technical scheme, the method for treating the chemical decontamination waste liquid of the nuclear power plant comprises the following steps:
s1, analyzing the quality of raw water inflow, and calculating the adding amount of related chemical agents;
s2, enabling the waste liquid to be treated to enter a pretreatment unit, wherein in the pretreatment unit, an iron ion removing device removes iron ions, an organic matter removing device removes organic matters, and effluent of the pretreatment unit enters an intermediate water tank;
s3, lifting the wastewater in the intermediate water tank into an ion exchange bed, fixing ionic nuclides and salts on ion exchange resin, and enabling the effluent of the ion exchange bed to enter a reverse osmosis water supply tank of a reverse osmosis device;
s4, water in the reverse osmosis water supply tank enters a reverse osmosis device, ionic nuclides are further separated in a first-stage reverse osmosis membrane, fresh water enters a second-stage reverse osmosis membrane, and concentrated solution is retreated before returning to an ion exchange bed;
and S5, enabling reverse osmosis fresh water discharged by the secondary reverse osmosis membrane to enter a fine treatment membrane stack, separating nuclide ions again, discharging the fresh water after reaching the standard, and returning the concentrated solution to a reverse osmosis water supply tank for secondary treatment.
The chemical decontamination waste liquid treatment system and the method for the nuclear power plant are different from the prior art in that the chemical decontamination waste liquid treatment system for the nuclear power plant is provided with a pretreatment unit, and iron ions, an organic decontaminating agent, a surfactant and the like are removed before wastewater enters ion exchange resin and a reverse osmosis membrane element, so that resin poisoning and fouling and blockage of the membrane element are prevented; nuclide ions are finally and completely fixed on the ion exchange resin and are finally discharged to a solid waste disposal center in a water conservancy flushing and discharging manner; the reverse osmosis membrane stack and the fine treatment membrane stack have separation effect on ionic nuclide, do not have accumulation of the ionic nuclide, can treat the waste liquid to a very low radioactivity level,
the chemical decontamination waste liquid treatment method for the nuclear power plant sets an accurate treatment process according to the waste liquid condition, prevents pollution blockage and poisoning of the main treatment unit, and reduces the operation and maintenance cost of the main treatment unit; in the invention, no secondary radioactive waste liquid is generated; wherein, the resin, the membrane element, the filter element and the like can be treated by adopting the original solid waste treatment process of the power plant.
The chemical decontamination waste liquid treatment system and method for the nuclear power plant are further described with reference to the accompanying drawings.
Drawings
FIG. 1 is a process flow diagram of a chemical decontamination waste liquid treatment system of a nuclear power plant according to the invention;
the notation in the figures means: 1-aeration fan; 2-a first circulation water tank; 3-a first circulating water pump; 4-a first precision filter; 5-hydrogen peroxide storage tank; 6-hydrogen peroxide dosing pump; 7-a second circulation water tank; 8-a second circulating water pump; 9-advanced oxidation reactor; 10-an intermediate water tank; 11-intermediate water pump; 12-a second precision filter; 13-ion exchange bed; 14-reverse osmosis feed tank; 15-a first feed pump; 16-a cartridge filter; 17-a first-stage reverse osmosis membrane; 18-a secondary reverse osmosis membrane; 19-a second feed pump; 20-reverse osmosis water producing tank; 21-a third feed pump; and 22-finely processing the membrane stack.
Detailed Description
The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Example 1
As shown in figure 1, the chemical decontamination waste liquid treatment system for the nuclear power plant comprises a pretreatment unit, a fixing unit and a deep purification unit. The pretreatment unit comprises an iron removal device and an organic matter removal device, the fixed unit is provided with an ion exchange bed 13, and the deep purification unit comprises a reverse osmosis device and a fine treatment membrane stack 22.
The iron removal device comprises a first circulating water tank 2. The first circulating water tank 2 is provided with a waste liquid inlet and an air inlet, the waste liquid inlet is used for introducing waste liquid to be treated, and the air inlet is connected with an aeration fan 1; the first circulating water tank 2 is also provided with a water outlet and a water return port, the water outlet is connected with a first circulating water pump 3 and a first precision filter 4, and water after circulating filtration enters a second circulating water tank 7 of the organic matter removing device through a valve. The iron removing device adoptsContinuously and continuously performing batch type treatment by aerating and adding the first precise filter 4 and using air to remove Fe 2+ Is oxidized into Fe 3+ And then forming a precipitate, lifting the waste liquid to a filter by using a circulating water pump, returning the effluent to the water tank for continuous aeration, and finally intercepting the finally formed precipitate on a filter element to finally remove iron ions in the waste liquid.
The second circulating water tank 7 of the organic matter removing device is provided with a water inlet and a liquid inlet, the water inlet is used for introducing wastewater discharged by the iron removing device, the liquid inlet is connected with a hydrogen peroxide dosing pump 6 and a hydrogen peroxide storage tank 5, and hydrogen peroxide in the hydrogen peroxide storage tank 5 is pumped into the second circulating water tank 7 by the hydrogen peroxide dosing pump 6; the second circulating water tank 7 is also provided with a water outlet and a water return port, the water outlet is connected with a second circulating water pump 8 and an advanced oxidation reactor 9, and water after circulating reaction enters the fixing unit through a valve.
The organic matter removing device is a cyclic continuous batch treatment, COD value in the waste liquid is firstly measured, chemical agents are added into a water tank according to a certain proportion, and organic components such as organic decontaminants, surfactants and the like in the waste liquid are removed by utilizing generated OH free radicals by adopting an advanced oxidation process.
The stationary unit comprises an intermediate water tank 10 and an ion exchange bed 13. The intermediate water tank 10 is provided with a water inlet, a water outlet and a water return port. The water inlet is used for introducing wastewater discharged by the organic matter removing device; the water outlet is connected with the water inlet of a second precision filter 12 through an intermediate water pump 11, and the water outlet of the second precision filter 12 is connected with the water inlet of an ion exchange bed 13. The ion exchange bed 13 adopts mixed bed resin, can replace and adsorb and remove ionic nuclide and salt in the wastewater, the ion exchange bed 13 is used as a final fixing means of the ionic nuclide, and after the resin reaches the exchange working capacity, a filter element with saturated adsorption needs to be replaced. The water outlet of the ion exchange bed 13 is connected with a deep purification unit.
The reverse osmosis device of the deep purification unit comprises a reverse osmosis water supply tank 14, and the reverse osmosis water supply tank 14 is provided with a water inlet, a water outlet and a water return port. The water inlet is used for introducing water discharged by the ion exchange bed 13, the water outlet is connected with a security filter 16 through a first water supply pump 15, and the water outlet of the security filter 16 is connected with the water inlet of the first-stage reverse osmosis membrane 17. The concentrated solution port of the first-stage reverse osmosis membrane 17 is connected with the water return port of the middle water tank 10. The water outlet of the first-stage reverse osmosis membrane 17 is connected with the water inlet of the second-stage reverse osmosis membrane 18 through a second water feed pump 19. The concentrated solution port of the second-stage reverse osmosis membrane 18 is connected with the water return port of the reverse osmosis water supply tank 14. The water outlet of the second-level reverse osmosis membrane 18 is connected with a reverse osmosis water production tank 20. The reverse osmosis device adopts two stages, the inside of each stage is provided with backflow, the effluent enters the next treatment unit, and the concentrated solution returns to the front of the ion exchange bed 13 or the reverse osmosis water supply tank 14 for treatment again.
The effluent of the ion exchange bed 13 enters a reverse osmosis device, which is used for reducing the radioactivity concentration in the produced water of the ion exchange bed 13 as much as possible, the penetrating fluid of the effluent enters a subsequent fine treatment membrane stack 22, and the concentrated solution is treated by the ion exchange bed 13 again before returning to the ion exchange bed 13, so that radioactivity is finally fixed on ion exchange resin.
The water outlet of the reverse osmosis water production tank 20 is connected with the water inlet of the fine treatment membrane stack 22 through a third water feed pump 21, and the water outlet of the fine treatment membrane stack 22 is used for discharging up-to-standard fresh water. In this embodiment, the fine treatment membrane stack 22 is a continuous electric desalting membrane stack.
The chemical decontamination waste liquid treatment system for the nuclear power plant firstly utilizes the pretreatment unit to remove iron ions, organic decontaminants, surfactants and the like in water, so that poisoning or pollution blockage caused by resin and membrane elements is avoided; fixing ionic nuclides in the waste liquid by using ion exchange resin, completely fixing the ionic nuclides on the resin, and finally discharging the ionic nuclides to a solid waste disposal center in a water conservancy flushing and discharging manner; and finally, further realizing the separation and concentration of the ionic nuclide by using a fine processing unit, discharging the separated fresh water after reaching the standard, returning the concentrated solution to the front end of the system, performing secondary processing, and finally fixing the concentrated solution on ion exchange resin.
Example 2
The invention relates to a method for treating chemical decontamination waste liquid of a nuclear power plant, which comprises the following steps:
step 1, analyzing the quality of raw water inflow, and calculating the dosage of related chemical agents;
step 2, enabling waste liquid to be treated to enter a water inlet tank and enter a pretreatment unit through a water inlet pump, removing iron ions by an iron removing device and organic matters by an organic matter removing device in the pretreatment unit, and enabling effluent of the pretreatment unit to enter an intermediate water tank 10;
and 5, the reverse osmosis fresh water discharged by the secondary reverse osmosis membrane 18 enters the fine treatment membrane stack 22, nuclide ions are separated again, the fresh water is discharged after reaching the standard, and the concentrated solution returns to the reverse osmosis water supply tank 14 for secondary treatment.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (9)
1. The utility model provides a chemical decontamination waste liquid treatment system of nuclear power plant which characterized in that: the device comprises a pretreatment unit, a fixing unit and a deep purification unit, wherein the pretreatment unit comprises an iron removal device and an organic matter removal device which are connected; the fixed unit is provided with an ion exchange bed, and the deep purification unit comprises a reverse osmosis device and a fine treatment membrane pile which are connected.
2. The chemical decontamination waste liquid treatment system for a nuclear power plant according to claim 1, characterized in that: the iron removal device comprises an aeration fan, a first circulating water tank and a first precision filter, the aeration fan sends air into the first circulating water tank, and a water outlet of the first circulating water tank is connected with the first precision filter.
3. The chemical decontamination waste liquid treatment system for a nuclear power plant according to claim 1, characterized in that: the organic matter removing device comprises a second circulating water tank and an advanced oxidation reactor, wherein a liquid inlet of the second circulating water tank is connected with the hydrogen peroxide storage tank, and a water outlet of the second circulating water tank is connected with the advanced oxidation reactor.
4. The chemical decontamination waste liquid treatment system for a nuclear power plant according to claim 1, wherein: the fixed unit comprises a middle water tank, the water outlet of the middle water tank is connected with an ion exchange bed, and the ion exchange bed is connected with a reverse osmosis device.
5. The chemical decontamination waste liquid treatment system for a nuclear power plant according to claim 4, characterized in that: and a second precision filter is arranged between the middle water tank and the ion exchange bed.
6. The chemical decontamination waste liquid treatment system for a nuclear power plant according to claim 1, characterized in that: the reverse osmosis device comprises a reverse osmosis water supply tank, a water outlet of the reverse osmosis water supply tank is connected with a first-stage reverse osmosis membrane, a water outlet of the first-stage reverse osmosis membrane is connected with a second-stage reverse osmosis membrane, and a water outlet of the second-stage reverse osmosis membrane is connected with a reverse osmosis water production tank.
7. The chemical decontamination waste liquid treatment system for a nuclear power plant according to claim 6, characterized in that: the concentrate mouth of the first-stage reverse osmosis membrane is connected with the middle water tank of the fixed unit, and the concentrate mouth of the second-stage reverse osmosis membrane is connected with the reverse osmosis water supply tank.
8. The chemical decontamination waste liquid treatment system for a nuclear power plant according to claim 1, characterized in that: the fine treatment membrane stack is a continuous electric desalting membrane stack.
9. A chemical decontamination waste liquid treatment method for a nuclear power plant, which utilizes the chemical decontamination waste liquid treatment device for the nuclear power plant according to any one of claims 1 to 8, and is characterized in that: the method comprises the following steps:
s1, analyzing the quality of raw water inlet water, and calculating the adding amount of related chemical agents;
s2, enabling the waste liquid to be treated to enter a pretreatment unit, wherein in the pretreatment unit, an iron ion removing device removes iron ions, an organic matter removing device removes organic matters, and effluent of the pretreatment unit enters an intermediate water tank;
s3, lifting the wastewater in the intermediate water tank into an ion exchange bed, fixing ionic nuclides and salts on ion exchange resin, and feeding the effluent of the ion exchange bed into a reverse osmosis water supply tank of a reverse osmosis device;
s4, water in the reverse osmosis water supply tank enters a reverse osmosis device, ionic nuclides are further separated in a first-stage reverse osmosis membrane, fresh water enters a second-stage reverse osmosis membrane, and concentrated solution is retreated before returning to an ion exchange bed;
and S5, enabling reverse osmosis fresh water discharged by the secondary reverse osmosis membrane to enter a fine treatment membrane stack, separating nuclide ions again, discharging the fresh water after reaching the standard, and returning the concentrated solution to a reverse osmosis water supply tank for secondary treatment.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117012429A (en) * | 2023-08-16 | 2023-11-07 | 西南科技大学 | Integrated nuclear medicine radioactive wastewater rapid treatment system and application method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117012429A (en) * | 2023-08-16 | 2023-11-07 | 西南科技大学 | Integrated nuclear medicine radioactive wastewater rapid treatment system and application method |
| CN117012429B (en) * | 2023-08-16 | 2024-03-22 | 西南科技大学 | Integrated nuclear medicine radioactive wastewater rapid treatment system and application method |
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Address after: Room 6401, 4th Floor, Building 1, No. 17 Shangdi 6th Street, Haidian District, Beijing, 100085 Applicant after: BEIJING CLEANNUS TECHNOLOGY CO.,LTD. Address before: 100085 no.18-2-3002, 3rd floor, No.7 shangdixinxi Road, Haidian District, Beijing Applicant before: BEIJING CLEANNUS TECHNOLOGY CO.,LTD. |
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