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A method for removing complex nuclides 110mag and 60co/58co in radioactive water

A complex state, radioactive technology, applied in the direction of radioactive purification, nuclear engineering, etc., can solve the problems of Ag/Co colloid removal technology, so that it is not easy to decompose by radiation or biodecomposition, avoid the amount of radioactive waste, and improve the adsorption efficiency Effect

Active Publication Date: 2018-04-06
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] It can be seen from the domestic research progress that the domestic research on the removal of radionuclides by inorganic adsorption is still in the stage of adsorbent selection and testing, and mainly for Sr, Cs and Co and other ionic nuclides, while the removal technology for Ag / Co colloids is almost No

Method used

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  • A method for removing complex nuclides 110mag and 60co/58co in radioactive water
  • A method for removing complex nuclides 110mag and 60co/58co in radioactive water
  • A method for removing complex nuclides 110mag and 60co/58co in radioactive water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Embodiment 1: the removal of Ag-EDTA complex

[0047] Prepare AgNO with Ag mass concentration of 20mg / L 3 Solution, add equimolar EDTA-2Na to form Ag-EDTA complex solution. The solution was distilled in a flask to simulate an evaporator, the effluent was collected, and the concentration of Ag was determined to be 0.51 mg / L. Therefore, the decontamination efficiency of the evaporation process for the Ag-EDTA complex was 97%. The slip-out liquid is injected into the membrane treatment unit, and after adopting the ultrafiltration (UF) process, the control concentration ratio is 10, the concentration of Ag in the concentrate is 3.06mg / L, and the concentration of Ag in the permeate is 0.23mg / L, so The removal efficiency of the ultrafiltration membrane unit to Ag-EDTA is 55%. Add 30% H to the concentrate 2 o 2 Aqueous solution, so that its volume ratio to the concentrated solution is 0.1mL / L. Inject the mixed solution into the ultraviolet catalytic reactor and adjust the...

Embodiment 2

[0048] Embodiment 2: the removal of Ag-citric acid complex

[0049] Prepare AgNO with Ag mass concentration of 20mg / L 3 solution, adding equimolar sodium citrate to form Ag-citric acid complex solution. The solution was distilled in a flask to simulate an evaporator, and the effluent was collected, and the concentration of Ag was determined to be 4.01 mg / L, so the decontamination efficiency of the evaporation process for the Ag-citric acid complex was 80%. The slip-out liquid is injected into the membrane treatment unit, and after adopting the nanofiltration (NF) process, the concentration ratio is controlled to be 10, the concentration of Ag in the concentrate is 36.7mg / L, and the concentration of Ag in the permeate is 0.38mg / L, so The removal efficiency of the nanofiltration membrane unit to Ag-citric acid is 90.5%. Add 30% H to the concentrate 2 o 2 Aqueous solution, so that its volume ratio to the concentrated solution is 0.1mL / L. Inject the mixed solution into the ul...

Embodiment 3

[0050]Example 3: Removal of Ag-surfactant complexes

[0051] Prepare AgNO with Ag mass concentration of 20mg / L 3 solution, adding surfactant BH3 commonly used in nuclear power plants to form Ag-BH3 complex solution. The solution was distilled in a flask to simulate an evaporator, the effluent was collected, and the Ag concentration was determined to be 10.19 mg / L, so the decontamination efficiency of the evaporation process on the Ag-BH3 complex was 49%. The effluent is injected into the membrane treatment unit, and after being treated by reverse osmosis (RO), the concentration ratio is controlled to be 10, the concentration of Ag in the concentrate is 97.2mg / L, and the concentration of Ag in the permeate is 0.53mg / L, so The removal efficiency of the reverse osmosis membrane unit to the Ag-BH3 complex is 94.8%. Add 30% H to the concentrate 2 o 2 Aqueous solution, so that its volume ratio to the concentrated solution is 0.4mL / L. Inject the mixed solution into the ultraviol...

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Abstract

The invention discloses a method for removing complex-state nuclide 110mAg and 60Co / 58Co in radioactive water. Radioactive wastewater is processed through an evaporation and concentration method, evaporation residual liquid enters a cement solidification unit, and condensed fluid enters a membrane purification unit. Permeating liquid generated by a membrane unit is discharged, concentrated liquor enters a catalysis and oxidation device, and ion-state Ag and Co are released by breaking complex structures of Ag and Co through catalysis and oxidation. Discharged water enters an inorganic adsorption unit to adsorb Ag and Co, and produced water and permeating liquid generated by the membrane unit are mixed and discharged. The new radioactive pollution wastewater treatment method with the 'membrane concentration, catalysis and oxidation and inorganic absorption' technology as the core is put forward for the problem that the removal effect of the current nuclear power plant evaporation process nuclide complexed with organic matter is poor, the nuclide, such as 110mAg and 60Co / 58Co, complexed with organic matter in wastewater can be removed, and the nuclear power plant radioactive waste liquid discharge is reduced.

Description

technical field [0001] The invention relates to a method for treating complexed nuclides in radioactive waste liquid by using membrane concentration, deep catalytic oxidation and adsorption technology 110m Ag and 60 Co / 58 Co's method, specifically related to the treatment of nuclear power plant chemical water. Background technique [0002] In the radioactive waste liquid produced by nuclear power plants in daily operation and accident conditions, there are mainly two sources of radionuclides, one source is fission products, the other source is activation products and corrosion products, which are mainly related to the activation of metal materials, Corrosion, precipitation and release behavior, this part of radionuclides include Ag, Co, Cr, Mn, Fe and other nuclides. The radioactive waste liquid of nuclear power plants includes three parts: process water, chemical water and floor water. [0003] Most of the nuclides in the radioactive waste liquid of nuclear power plant...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21F9/12
CPCG21F9/12
Inventor 赵璇尉继英李福志
Owner TSINGHUA UNIV
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