Study On Conductivity Of Ion-exchange Resin Packed In Continuous Electrodeionization For The Treatment Of Low-Level Radioactive Wastewater

As the oil, coal and other non-renewable energy resources are becoming gradually exhausted, nuclear energy has been developed rapidly as an important alternative energy sources. The treatment of nuclear waste is very important in the nuclear industry. While the treatment and disposal of low-level radioactive wastewater (LLRWW) is the important part of it.Continuous Electrodionization (CEDI) is a new type of water treatment technology developed in the recent years, which is composed of electrodialysis and ion-exchange technology. Compared with the traditional technologies in the field of radioactive wastewater treatment, CEDI has the advantages as follows:(1) depth desalting, (2) the resin can be regenerated continuously without chemicals and no radioactive spent resin is produced theoretically. CEDI technology is consistent with energy-efficient small quantitative principle of radioactive waste.The ion-exchange resins which are filled in module of CEDI play an important role in reducing resistance, improving ion mobility and reducing energy consumption. In this paper, the conductivity measurement method of ion exchange resins was established based on studying the conductive mechanism of ion-exchange resins. Using this method the electrical conductivities of six single and three mixed ion exchange resins were measured. In addition, the electrical conductivities of three anode ion-exchange resins in different count-ion solution were measured using this method.Furthermore, the activated product cobalt with long-life of corrosion and fission products strontium and cesium selected as simulated radioactive nuclides, the treatment of simulated low level radioactive wastewater was investigated using a CEDI process with different ion-exchange resins.At last, this study compared the result between ion-exchange resins electrical conductivity and CEDI operating parameters. It was concluded as follows: (1) The conductivity of CEDI shows a negative correlation with that of the ion-exchange resins filled in CEDI. (2) The removal efficiencies of different nuclide ions by CEDI show a positive correlation with the conductivity of ion-exchange resin in the corresponding count-ion solutions.