CN111951994A - System for treating uranium in nuclear wastewater by utilizing photocatalytic three-dimensional electrolysis method - Google Patents
System for treating uranium in nuclear wastewater by utilizing photocatalytic three-dimensional electrolysis method Download PDFInfo
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- CN111951994A CN111951994A CN202010919161.6A CN202010919161A CN111951994A CN 111951994 A CN111951994 A CN 111951994A CN 202010919161 A CN202010919161 A CN 202010919161A CN 111951994 A CN111951994 A CN 111951994A
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- 229910052770 Uranium Inorganic materials 0.000 title claims abstract description 74
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 title claims abstract description 70
- 239000002351 wastewater Substances 0.000 title claims abstract description 52
- 238000005868 electrolysis reaction Methods 0.000 title claims abstract description 48
- 230000001699 photocatalysis Effects 0.000 title claims abstract description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 34
- 239000002245 particle Substances 0.000 claims abstract description 17
- 238000005273 aeration Methods 0.000 claims abstract description 15
- 239000007800 oxidant agent Substances 0.000 claims abstract description 11
- 239000010865 sewage Substances 0.000 claims abstract description 10
- 230000003197 catalytic effect Effects 0.000 claims abstract description 9
- 239000010453 quartz Substances 0.000 claims abstract description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 9
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims abstract description 8
- 210000005056 cell body Anatomy 0.000 claims abstract description 8
- 239000000126 substance Substances 0.000 claims abstract description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 29
- 238000000034 method Methods 0.000 claims description 27
- 210000004027 cell Anatomy 0.000 claims description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 11
- 230000008569 process Effects 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 229910052742 iron Inorganic materials 0.000 claims description 7
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims description 6
- 238000002798 spectrophotometry method Methods 0.000 claims description 6
- 239000006228 supernatant Substances 0.000 claims description 6
- -1 iron ions Chemical class 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 5
- 238000002791 soaking Methods 0.000 claims description 5
- 239000002699 waste material Substances 0.000 claims description 5
- 239000011521 glass Substances 0.000 claims description 4
- 239000010439 graphite Substances 0.000 claims description 4
- 229910002804 graphite Inorganic materials 0.000 claims description 4
- 239000012528 membrane Substances 0.000 claims description 4
- 238000005065 mining Methods 0.000 claims description 4
- 238000001179 sorption measurement Methods 0.000 claims description 4
- ZIMRZUAJVYACHE-UHFFFAOYSA-N uranium;hydrate Chemical compound O.[U] ZIMRZUAJVYACHE-UHFFFAOYSA-N 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 238000000975 co-precipitation Methods 0.000 claims description 3
- 238000009833 condensation Methods 0.000 claims description 3
- 230000005494 condensation Effects 0.000 claims description 3
- 239000008367 deionised water Substances 0.000 claims description 3
- 229910021641 deionized water Inorganic materials 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 238000005272 metallurgy Methods 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 2
- 238000004140 cleaning Methods 0.000 claims 2
- 238000007146 photocatalysis Methods 0.000 claims 2
- 230000003213 activating effect Effects 0.000 claims 1
- 238000003795 desorption Methods 0.000 claims 1
- 238000004065 wastewater treatment Methods 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 description 5
- 150000001875 compounds Chemical class 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000005342 ion exchange Methods 0.000 description 3
- 230000001590 oxidative effect Effects 0.000 description 3
- 230000002285 radioactive effect Effects 0.000 description 3
- 230000004913 activation Effects 0.000 description 2
- 238000009388 chemical precipitation Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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- 229910052751 metal Inorganic materials 0.000 description 1
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- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000002354 radioactive wastewater Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000027756 respiratory electron transport chain Effects 0.000 description 1
- 125000005289 uranyl group Chemical group 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
- G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
- G21F9/04—Treating liquids
- G21F9/06—Processing
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
- C02F1/46109—Electrodes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
- C02F1/46109—Electrodes
- C02F1/46114—Electrodes in particulate form or with conductive and/or non conductive particles between them
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/463—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrocoagulation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
- C02F1/46109—Electrodes
- C02F2001/46133—Electrodes characterised by the material
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/006—Radioactive compounds
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- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
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Abstract
The invention belongs to the technical field of nuclear wastewater treatment by a three-dimensional electrolysis method, and discloses a system for treating uranium in nuclear wastewater by a photocatalytic three-dimensional electrolysis method, wherein an electrolysis anode, an electrolysis cathode, a particle distribution electrode and an external direct current power supply are placed in a cell body, and the external direct current power supply is respectively connected with the electrolysis anode and the electrolysis cathode through leads; four quartz tubes with built-in ozone ultraviolet lamp tubes are vertically arranged in the tank body, and a horizontally arranged mounting plate is arranged close to the upper part in the tank body; four aeration systems are arranged at the bottom of the space in the tank body, and a water inlet pipeline is connected with an inlet of the ejector; the outlet of the jet device is communicated with the tank body, and the chemical feeding port of the jet device is connected with the catalytic oxidizer tank. According to the requirements of sewage treatment capacity and treatment effect, a plurality of sewage pools can be connected in series or in parallel. It is suitable for sewage treatment, and has the advantages of low investment, low cost and small occupied area. The treatment effect is stable, and the operation is reliable.
Description
Technical Field
The invention belongs to the technical field of nuclear wastewater treatment by a three-dimensional electrolysis method, and particularly relates to a system for treating uranium in nuclear wastewater by a photocatalytic three-dimensional electrolysis method.
Background
At present, radioactive nuclide uranium wastewater can be generated in the uranium ore mining and smelting process and the nuclear facility operation process, and the wastewater has serious harm to the ecological environment. The valence of uranium radionuclide capable of stably existing is hexavalent uranium U (VI) and tetravalent uranium U (IV), wherein the axis of the water body exists in the form of two valence states of U (VI) and U (IV) which are coexistent with oxides or compounds of other metals, wherein U (IV) is easy to remove and precipitates mainly because U (IV) can form a stable complex with inorganic carbon; u (VI) is generally a more soluble uranyl ion
Because the uranium in the wastewater can form various salt compounds with other cations, carbonate, phosphate, sulfate and the like, and is not easy to remove, the removal of uranium in the wastewater mainly refers to the removal of u (vi) and compounds thereof. Generally of this typeThe compound has high solubility, and is easy to dissolve in water environment. The uranium-bearing waste water treatment mainly refers to the removal of hexavalent uranium U (VI) and compounds thereof, so that the repair technology based on the reduction of hexavalent uranium is a research hotspot for treating uranium waste water pollution. At present, the uranium-bearing wastewater treatment technology with high efficiency, low cost and environmental protection for uranium-bearing wastewater is still to be further developed and researched.
Through the above analysis, the problems and defects of the prior art are as follows: the uranium-bearing wastewater treatment technology with high efficiency, low cost and environmental protection for uranium-bearing wastewater in the prior art is still to be further developed and researched.
The difficulty in solving the above problems and defects is: the radioactive waste water treatment method includes evaporation, chemical precipitation, ion exchange, adsorption and the like. The evaporation process is highly efficient, but is costly, and presents the risk of corrosion, foaming, scaling and explosion. The chemical precipitation method has the advantages of simple method, low cost and mature technology; the disadvantage is that it is easy to cause secondary pollution. Many radioactive elements are in an ionic state in water, are well suited for ion exchange, and can operate for long periods of time without failure during ion exchange. The disadvantages are that the requirement for the quality of raw water is high, and the regeneration and disposal of the ion exchanger are difficult.
The significance of solving the problems and the defects is as follows: no secondary pollution, low power consumption, safety, reliability, environmental protection. Greatly reducing the harm of radioactive elements to human and environment.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a system for treating uranium in nuclear wastewater by using a photocatalytic three-dimensional electrolysis method.
The system for treating uranium in nuclear wastewater by using the photocatalytic three-dimensional electrolysis method is provided with a tank body;
an electrolytic anode, an electrolytic cathode, a distributed particle electrode and an external direct current power supply are arranged in the cell body, and the external direct current power supply is respectively connected with the electrolytic anode and the electrolytic cathode through leads;
four quartz tubes with built-in ozone ultraviolet lamp tubes are vertically arranged in the tank body, and a horizontally arranged mounting plate is arranged close to the upper part in the tank body;
four aeration systems are arranged at the bottom of the space in the tank body, and a water inlet pipeline is connected with an inlet of the ejector; the outlet of the jet device is communicated with the tank body, and the chemical feeding port of the jet device is connected with the catalytic oxidizer tank.
Furthermore, the tank body is an organic glass body, and the top of the tank body is open.
Further, the aeration system is membrane aeration.
Furthermore, the material of the electrolytic anode is metallic iron, the electrolytic cathode is graphite, and the particle electrode is activated carbon.
Another object of the present invention is to provide a method for treating uranium in nuclear wastewater by using a photocatalytic three-dimensional electrolysis method, in which the system for treating uranium in nuclear wastewater by using a photocatalytic three-dimensional electrolysis method comprises: the wastewater is uniformly mixed with the catalytic oxidizer by the water inlet pipeline through the ejector and then flows into the cell body, and is discharged through the water outlet pipeline under the combined action of all systems in the electrolytic cell; the particle electrode put into the electrolytic cell and the electrolytic cathode and the electrolytic anode in the electrolytic cell form a three-dimensional electrode system respectively; converting iron ions into ferroferric oxide through an electrolytic reaction, reducing hexavalent uranium U in the nuclear waste liquid into tetravalent uranium U, and performing condensation and coprecipitation with the ferroferric oxide; after 60min of electrolytic reaction, the residual quantity of uranium in sewage discharged by a water outlet pipeline of the three-dimensional electrolytic cell is lower than the national safe discharge standard, and the sewage is used as uranium water which reaches the standard and is discharged safely.
Further, the method for treating uranium in nuclear wastewater by using the photocatalytic three-dimensional electrolysis method further comprises the following steps: the uranium removal rate test process comprises measuring a certain amount of supernatant from water inlet pipe before electrolysis, and measuring U (VI) concentration C by spectrophotometry1Measuring a certain amount of supernatant from the water outlet pipe after the electrolysis is finished, and measuring the concentration C of U (VI) by spectrophotometry2The uranium removal rate was calculated as follows:
the invention also aims to provide a method for treating radionuclide-uranium wastewater in a uranium ore mining and metallurgy process, which uses the system for treating uranium in nuclear wastewater by utilizing a photocatalytic three-dimensional electrolysis method.
Another object of the present invention is to provide a method for treating wastewater containing uranium radionuclide and uranium in a nuclear facility operation process, which uses the system for treating uranium in nuclear wastewater by using a photocatalytic three-dimensional electrolysis method.
Another object of the present invention is to provide a method for treating uranium wastewater pollution, which uses the system for treating uranium in nuclear wastewater by using a photocatalytic three-dimensional electrolysis method.
By combining all the technical schemes, the invention has the advantages and positive effects that: the method has the advantages of accelerating electron transfer, improving the removal rate of uranium, generating no secondary pollution, low power consumption, safety, reliability and environmental protection. Can be suitable for sewage treatment, saves investment, reduces cost and reduces occupied area. The treatment effect is stable, and the operation is reliable.
The device for recycling uranium in nuclear wastewater by the photocatalytic three-dimensional electrolysis method provided by the invention is suitable for treating uranium-containing nuclear wastewater, and has the advantages of saving investment as much as possible, reducing operation cost and reducing occupied area. The low-cost and high-efficiency nuclear wastewater treatment method has the advantages of wide applicability, low operation cost and environmental protection. Meanwhile, the removing rate of uranyl ions in the low-concentration uranium waste liquid with the concentration of less than 10mg/L can reach 99.8%, the residual quantity is lower than the national safe discharge standard (0.05mg/L), and the uranium waste liquid can be used as uranium water which reaches the standard and is discharged safely. In a three-dimensional electrochemical device: the introduction of the particle electrode can improve the electrolysis efficiency by times, and the electrolysis process is shortened to 1 hour.
The tank body is an organic glass body, and the top of the tank body is open, so that observation is convenient. The aeration system in the invention is membrane aeration, thus improving the reaction efficiency.
The material of the electrolytic anode is metallic iron, the material of the electrolytic cathode is inert graphite, the particle electrode is activated carbon, and the activated carbon is repeatedly washed and soaked by deionized water to remove particle impurities and the like in the activated carbon until the washing wastewater is colorless. Performing surface activation by using dilute sulfuric acid, soaking in clear water for 24h to fully desorb, transferring to a drying oven, and drying at 105 ℃ for 24 h. When in use, the activated carbon is soaked in the wastewater to achieve the adsorption balance.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained from the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a system for treating uranium in nuclear wastewater by using a photocatalytic three-dimensional electrolysis method according to an embodiment of the invention.
Fig. 2 is a schematic structural view of a tank body provided in the embodiment of the present invention.
In the figure: 1. a tank body; 2. a water inlet line; 3. an ejector; 4. an oxidant tank; 5. an aeration system; 6. an outlet line; 7. a quartz tube with an ozone ultraviolet lamp inside; 8. a quartz tube mounting plate with an ozone ultraviolet lamp arranged inside; 9. an electrolytic anode; 10. an electrolytic cathode; 11. a direct current power supply; 12. and a particle electrode.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Aiming at the problems in the prior art, the invention provides a system for treating uranium in nuclear wastewater by a photocatalytic three-dimensional electrolysis method, and the system is described in detail below with reference to the accompanying drawings.
As shown in fig. 1-2, a system for treating uranium in nuclear wastewater by using a photocatalytic three-dimensional electrolysis method according to an embodiment of the present invention includes: an electrolysis device and a photocatalytic device;
the electrolysis apparatus comprises: the cell body 1 and the electrolytic cell are internally provided with an electrolytic cathode 10, an electrolytic anode 9 and a particle electrode 12, and the electrolytic cathode 10 and the electrolytic anode 9 are connected with a direct current power supply 11.
The photocatalytic device includes: the device comprises a water inlet pipeline 2, an ejector 3, an oxidant tank 4, an aeration system 5, a water outlet pipeline 6, a quartz tube 7 with a built-in ozone ultraviolet lamp tube, a quartz tube mounting plate 8 with a built-in ozone ultraviolet lamp, and the aeration system 5 mounted at the bottom in the tank body, wherein the water inlet pipeline 2 is connected with an inlet of the ejector 3, an outlet of the ejector 3 is communicated with the tank body 1, and a dosing port of the ejector 3 is connected with the catalytic oxidant tank 4.
An electrolytic anode 9, an electrolytic cathode 10, a particle distribution electrode 12 and an external direct current power supply 11 are arranged in the cell body 1; an external direct current power supply 11 is respectively connected with the electrolysis anode 9 and the electrolysis cathode 10 through leads; four quartz tubes 7 with built-in ozone ultraviolet lamp tubes are vertically arranged in the tank body 1, and a horizontally arranged mounting plate 8 is arranged close to the upper part in the tank body 1 and used for fixing each quartz tube 7; four aeration systems 5 are installed at the bottom of the space in the pool body 1, a water inlet pipeline 2 is connected with an inlet of an ejector 3, an outlet of the ejector 3 is communicated with the pool body 1, and a chemical adding port of the ejector 3 is connected with a catalytic oxidizer pool 4.
In this embodiment, the tank body 1 is made of organic glass, and the top of the tank body 1 is open.
In this embodiment, the inlet water and the catalytic oxidizer are uniformly mixed by the ejector 3 and enter the tank body 1.
In this embodiment, the aeration system 5 used is membrane aeration.
In this embodiment, the material of the electrolytic anode 9 is metallic iron, the material of the electrolytic cathode 10 is inert graphite, and the material of the particle electrode 12 is activated carbon. The activated carbon is repeatedly washed and soaked by deionized water to remove particle impurities and the like in the activated carbon until the washing wastewater is colorless. Performing surface activation by using dilute sulfuric acid, soaking in clear water for 24h to fully desorb, transferring to a drying oven, and drying at 105 ℃ for 24 h. When in use, the activated carbon is soaked in the wastewater to achieve the adsorption balance.
When the device is in a working state, wastewater is uniformly mixed by the water inlet pipeline 2 and the catalytic oxidizer 4 through the ejector 3 and then flows into the cell body 1, and is discharged through the water outlet pipeline 6 under the combined action of all systems in the electrolytic cell. In the device, a particle electrode 12 put into the electrolytic cell and an electrolytic cathode 10 and an electrolytic anode 9 in the electrolytic cell form a three-dimensional electrode system respectively. Iron ions are converted into ferroferric oxide through an electrolytic reaction, hexavalent uranium U (VI) in the nuclear waste liquid is reduced into tetravalent uranium U (IV), and the hexavalent uranium U (VI) and the tetravalent uranium U (IV) are subjected to condensation and coprecipitation with the ferroferric oxide. After 60min of electrolytic reaction, the residual quantity of uranium in sewage discharged by a water outlet pipeline of the three-dimensional electrolytic cell is lower than the national safe discharge standard, and the sewage can be used as uranium water which reaches the standard and is discharged safely.
The method comprises measuring a certain amount of supernatant from water inlet pipe before electrolysis, and measuring U (VI) concentration C by spectrophotometry1Measuring a certain amount of supernatant from the water outlet pipe after the electrolysis is finished, and measuring the concentration C of U (VI) by spectrophotometry2The uranium removal rate was calculated as follows:
in the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The above description is only for the purpose of illustrating the present invention and the appended claims are not to be construed as limiting the scope of the invention, which is intended to cover all modifications, equivalents and improvements that are within the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The utility model provides a system for handle uranium in nuclear waste water with three-dimensional electrolysis of photocatalysis, its characterized in that, system for handle uranium in nuclear waste water with three-dimensional electrolysis of photocatalysis is provided with:
a tank body;
an electrolytic anode, an electrolytic cathode, a distributed particle electrode and an external direct current power supply are arranged in the cell body, and the external direct current power supply is respectively connected with the electrolytic anode and the electrolytic cathode through leads;
four quartz tubes with built-in ozone ultraviolet lamp tubes are vertically arranged in the tank body, and a horizontally arranged mounting plate is arranged close to the upper part in the tank body;
four aeration systems are arranged at the bottom of the space in the tank body, and a water inlet pipeline is connected with an inlet of the ejector; the outlet of the jet device is communicated with the tank body, and the chemical feeding port of the jet device is connected with the catalytic oxidizer tank.
2. The system for uranium treatment in nuclear wastewater by photocatalytic three-dimensional electrolysis according to claim 1, wherein the tank body is an organic glass body and the top of the tank body is open.
3. The system for treating uranium in nuclear wastewater by photocatalytic three-dimensional electrolysis according to claim 1, wherein the aeration system is membrane aeration.
4. The system for treating uranium in nuclear wastewater by photocatalytic three-dimensional electrolysis according to claim 1, wherein the material of the electrolysis anode is metallic iron, the material of the electrolysis cathode is inert graphite, and the material of the particle electrode is activated carbon.
5. The method for treating uranium in nuclear wastewater by using the photocatalytic three-dimensional electrolysis method, according to the system for treating uranium in nuclear wastewater by using the photocatalytic three-dimensional electrolysis method as described in any one of claims 1 to 4, comprises the following steps: the wastewater is uniformly mixed with the catalytic oxidizer by the water inlet pipeline through the ejector and then flows into the cell body, and is discharged through the water outlet pipeline under the combined action of all systems in the electrolytic cell; the particle electrode put into the electrolytic cell and the electrolytic cathode and the electrolytic anode in the electrolytic cell form a three-dimensional electrode system respectively; converting iron ions into ferroferric oxide through an electrolytic reaction, reducing hexavalent uranium U in the nuclear waste liquid into tetravalent uranium U, and performing condensation and coprecipitation with the ferroferric oxide; after 60min of electrolytic reaction, the residual quantity of uranium in sewage discharged by a water outlet pipeline of the three-dimensional electrolytic cell is lower than the national safe discharge standard, and the sewage is used as uranium water which reaches the standard and is discharged safely.
6. The method for treating uranium in nuclear wastewater by photocatalytic three-dimensional electrolysis according to claim 5, further comprising: the uranium removal rate test process comprises measuring a certain amount of supernatant from water inlet pipe before electrolysis, and measuring U (VI) concentration C by spectrophotometry1Measuring a certain amount of supernatant from the water outlet pipe after the electrolysis is finished, and measuring the concentration C of U (VI) by spectrophotometry2The uranium removal rate was calculated as follows:
7. the method for treating uranium in nuclear wastewater by photocatalytic three-dimensional electrolysis according to claim 5, further comprising: repeatedly cleaning and soaking the active carbon by using deionized water to remove particle impurities in the active carbon until the cleaning wastewater is colorless; activating the surface with dilute sulfuric acid, soaking in clear water for 24 hr for complete desorption, transferring to a drying oven, drying at 105 deg.C for 24 hr, and soaking activated carbon with waste water to reach adsorption balance.
8. A method for treating radionuclide-uranium wastewater in a uranium ore mining and metallurgy process is characterized in that the system for treating uranium in nuclear wastewater by a photocatalytic three-dimensional electrolysis method according to any one of claims 1 to 4 is used in the method for treating radionuclide-uranium wastewater in the uranium ore mining and metallurgy process.
9. A method for treating radionuclide-uranium wastewater in a nuclear facility operation process, which is characterized in that the system for treating uranium in nuclear wastewater by using a photocatalytic three-dimensional electrolysis method according to any one of claims 1 to 4 is used.
10. A method for treating uranium wastewater pollution, which is characterized in that the system for treating uranium in nuclear wastewater by using a photocatalytic three-dimensional electrolysis method according to any one of claims 1 to 4 is used.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112992397A (en) * | 2021-03-26 | 2021-06-18 | 南华大学 | Device and method for removing uranium in low-concentration uranium-containing wastewater through alternative double-anode mineralization |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112992397A (en) * | 2021-03-26 | 2021-06-18 | 南华大学 | Device and method for removing uranium in low-concentration uranium-containing wastewater through alternative double-anode mineralization |
| CN112992397B (en) * | 2021-03-26 | 2022-10-04 | 南华大学 | Device and method for removing uranium in low-concentration uranium-containing wastewater through alternative double-anode mineralization |
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