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Method for processing low radioactive waste liquid by continuous electrodeionization

A technology for electrolytic desalination and waste liquid, applied in separation methods, dispersed particle separation, etc.

Active Publication Date: 2010-03-10
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] Utilize described method to process the low level waste liquid that contains Co, the volume content of weakly basic anion exchange resin in the fresh water chamber of CEDI membrane stack is 60%, does not contain quaternary ammonium functional group, uses 1.0mol earlier before filling into the fresh water chamber / L of hydrochloric acid to fully rinse, and then transform with an equivalent amount of 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 rinse with deionized water. When the concentration of Co in the influent water of the membrane stack is 100μg / L, the concentration of Co in the effluent water 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 containing Co, Cs, and Sr, the volume content of the weakly basic anion exchange resin in the fresh water chamber of the CEDI membrane stack is 20%, and does not contain quaternary ammonium functional groups. Before loading 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 strongly acidic cation exchange resin in the fresh water chamber of the CEDI membrane stack is 50%, and the volume content of the strongly basic anion exchange resin is 30%. When the concentration of Co, Cs and Sr in the influent water of the membrane stack is 10 μg / L, the concentrations of Co, Cs and Sr in the effluent water are respectively lower than 2ng / L, 1ng / L and 5ng / L, and the remo...

Embodiment 3

[0029]Utilize described method to process the low level waste liquid that contains Co, Cs, Sr, the volume content of the weakly basic anion exchange resin in the fresh water chamber of CEDI membrane stack is 30%, contains 20% quaternary ammonium functional group, is loaded into the fresh water chamber Before fully rinsing with 0.25mol / L sulfuric acid, and then transforming with an equivalent sodium hydroxide solution, the volume of the acid-base solution is 5 times the amount of the ion-exchange resin to be treated, and finally rinse with deionized water. The volume content of the strongly acidic cation exchange resin in the fresh water chamber of the CEDI membrane stack is 50%, and the volume content of the strongly basic anion exchange resin is 20%. When the concentration of Co, Cs, and Sr in the influent water of the membrane stack is 10 μg / L, the concentrations of Co, Cs, and Sr in the effluent water are all lower than 10 ng / L, and the removal efficiency is above 99.9%.

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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 radioactive 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 treatment 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 radioactive liquid waste is one of the important contents of nuclear waste management. For all activities related to radioactive materials in nuclear facilities, the health and safety of operating personnel and the public must be considered, as well as the impact of all activities on the environment. Waste generated during activities needs to be stored and disposed of safely. Waste minimization is the core part of radioactive waste management, in order to limit the generation and spread of radioactive pollutants, reduce the amount of waste s...

Claims

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Application Information

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IPC IPC(8): C02F1/469
Inventor 赵璇李福志
Owner TSINGHUA UNIV
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