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Method for processing low radioactive waste liquid by continuous electrodeionization

A technology for electrostatic desalination and waste liquid, which is applied in separation methods, radioactive purification, nuclear engineering, etc.

Active Publication Date: 2011-07-20
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the problems existing in the existing continuous electric desalination treatment of low-level waste water, the purpose of the present invention is to improve the efficiency of continuous electric desalination treatment of low-level waste liquid by improving the resin ratio inside the fresh water chamber of the membrane stack

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Using the method to treat low-level waste liquid containing Co, the volume content of weakly basic anion exchange resin in the fresh water chamber of the CEDI membrane stack is 60%, and does not contain quaternary amine functional groups. Before filling into the fresh water chamber, 1.0 mol of / L hydrochloric acid is fully rinsed, and then transformed with an equivalent sodium hydroxide solution, the volume of the acid-base solution is twice the amount of the weakly basic anion exchange resin to be treated, and finally rinsed with deionized water. When the concentration of Co in the influent of the membrane stack is 100μg / L, the concentration of Co in the effluent is lower than 2ng / L, and the removal efficiency is higher than 99.998%.

Embodiment 2

[0027] Using the method to treat low-level waste liquid containing Co, Cs, and Sr, the volume content of weakly basic anion exchange resin in the fresh water chamber of the CEDI membrane stack is 20%, and does not contain quaternary amine functional groups. Before filling into the fresh water chamber First, fully rinse with 0.1mol / L hydrochloric acid, and then transform with an equivalent sodium hydroxide solution. The volume of the acid-base solution is 10 times the amount of the weakly basic anion exchange resin to be treated, and finally rinse with deionized water. The volume content of the strong acid cation exchange resin in the fresh water chamber of the CEDI membrane stack is 50%, and the volume content of the strong base anion exchange resin is 30%. When the concentration of Co, Cs and Sr in the influent of the membrane stack is 10μg / L, the concentration of Co, Cs and Sr in the effluent is lower than 2ng / L, 1ng / L and 5ng / L, respectively, and the removal efficiency is hi...

Embodiment 3

[0029]Using the method to treat low-level waste liquid containing Co, Cs and Sr, the volume content of weakly basic anion exchange resin in the fresh water chamber of the CEDI membrane stack is 30%, containing 20% ​​of quaternary amine functional groups, and is filled into the fresh water chamber. First, fully rinse with 0.25mol / L sulfuric acid, and then transform with an equivalent sodium hydroxide solution. The volume of the acid-base solution is 5 times the amount of the treated ion exchange resin, and finally rinse with deionized water. The volume content of the strong acid cation exchange resin in the fresh water chamber of the CEDI membrane stack is 50%, and the volume content of the strong base anion exchange resin is 20%. When the concentrations of Co, Cs and Sr in the influent of the membrane stack were 10 μg / L, the concentrations of Co, Cs and Sr in the effluent were all lower than 10 ng / L, and the removal efficiencies were all above 99.9%.

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PUM

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Abstract

The invention relates to a method for processing low radioactive waste liquid by continuous electrodeionization, which is characterized by comprising the following steps: alternately arranging an anion exchange membrane and a cation exchange membrane between a negative electrode and a positive electrode; filling ion exchange resin between the ion exchange membranes to form fresh water chambers; forming a concentrated water chamber between adjacent fresh water chambers; alternately arranging the fresh water chambers and the concentrated water chambers to form a whole membrane pile; filling 20-60 percent of alkalescence anion exchange resin, 30-50 percent of strongly acidic cation resin and 10-30 percent of strongly basic anion resin into the fresh water chambers; applying direct current voltage at both ends of the membrane pile and leading the direction of an electric field to be perpendicular to the ion exchange membranes. The low radioactive waste liquid enters into the fresh water chambers, and nuclide ions generate directional migration under the action of a direct current electric field in a resin phase and enter the concentrated water chambers by the anion exchange membrane and the cation exchange membrane. The alkalescence anion exchange resin is added into the membrane pile, and the processing efficiency is greatly improved by fully utilizing the high selectivity of theresin on transition metal ions on the premise of not changing equipment.

Description

technical field [0001] The invention relates to a method for treating low-level waste liquid by using continuous electric desalination, and belongs to the technical field of sewage treatment. Background technique [0002] As an important part of the nuclear industry, the control of the three nuclear wastes has a very important status and has attracted more and more public attention. The treatment and disposal of low-level waste liquid is one of the important contents of nuclear waste management. All activities related to radioactive material in nuclear facilities must take into account the health and safety of operators and the public and the impact of all activities on the environment. Waste generated during the event needs to be stored and disposed of safely. Waste miniaturization is a core part of radioactive waste management to limit the generation and spread of radioactive contaminants and reduce the amount of waste stored and disposed of, thereby reducing the environ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21F9/04C02F1/469
Inventor 赵璇李福志
Owner TSINGHUA UNIV