A method and system for treating radioactive waste incineration process wastewater by electrodialysis

Abstract

The invention relates to a radioactive waste treatment technology, in particular to a method and a system for performing electrodialysis treatment on radioactive waste incineration process waste water. The method for performing the electrodialysis treatment on the radioactive waste incineration process waste water includes: respectively placing the process waste water in a primary water concentration tank and a primary water desalination tank according to a volume ratio of 1:1, generating a primary desalinated solution and a primary concentrated solution after performing primary circulation desalination on the process waste water, respectively feeding the primary desalinated solution to a secondary water concentration tank and a secondary water desalination tank according to a concentration and desalination solution volume ratio of 3.5:4.5, performing secondary circulation desalination on the primary desalinated solution in the secondary water concentration tank and the secondary water desalination tank so as to generate a secondary desalinated solution, using a part of the secondary desalinated solution to prepare incineration system new absorption liquid, and discharging the rest of the secondary desalinated solution; performing direct current concentration on the primary concentrated solution separately fed to a concentration chamber and a desalination chamber in a concentration tank according to a volume ration of 5:7 so as to obtain a direct current concentrated solution, spraying the direct current concentrated solution into high temperature flue gas so as to achieve spray drying, and using a bag filter to collect salt particles obtained after the spray drying. The method for performing the electrodialysis treatment on the radioactive waste incineration process waste water is simple in process, and the system for performing the electrodialysis treatment on the radioactive waste incineration process waste water is compact, simple and convenient to operate and run, and low in energy consumption.

Description

Technical field [0001] The invention relates to a radioactive waste treatment technology, in particular to a method and system for electrodialysis to treat waste water from a radioactive waste incineration process. Background technique [0002] The high-temperature flue gas generated after the incineration of combustible radioactive waste contains non-radioactive pollutants such as dust, heavy metals, and acid gases, and needs to be cooled and purified before being discharged. The incineration system has an effect on the HCl and SO contained in the flue gas x , NO x Wait for acid gas, use Na 2 CO 3 The solution is neutralized and absorbed, and when the pH value is lower than 8, the purification efficiency cannot be met, and it becomes process wastewater. Process wastewater contains Cl - , SO 4 2- , SO 3 2- , NO 3 - , NO 2 - , CO 3 2- , HCO 3 - Equal anions, where Cl - Accounted for more than 90%; cations mainly include Na + , Ca 2+ , Mg 2+ Etc. where Na + Accounted for more than ...

AI Technical Summary

Problems solved by technology

[0003] In the past, traditional processes such as evaporation and ion exchange have been used to treat process wastewater, but there are some problems in practical applications, mainly including: Cl contained in process wastewater - The equipment in the low-level wastewater treatment facilities is severely corroded, and the HCO contained in the process wastewater 3- It has an analytical effect on the ion exchange columns used in low-level wastewater treatment facilities, which seriously affects the overall wastewater treatment effect

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