Nuclear Engineering and Technology

  • 제55권2호
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  • Pages.516-522
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  • 2023
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  • 1738-5733(pISSN)
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  • 2234-358X(eISSN)
한국원자력학회 (Korean Nuclear Society)
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Effective removal of non-radioactive and radioactive cesium from wastewater generated by washing treatment of contaminated steel ash

  • P. Sopapan (Radioactive Waste Management Center, Thailand Institute of Nuclear Technology (Public Organization)) ;
  • U. Lamdab (Radioactive Waste Management Center, Thailand Institute of Nuclear Technology (Public Organization)) ;
  • T. Akharawutchayanon (Radioactive Waste Management Center, Thailand Institute of Nuclear Technology (Public Organization)) ;
  • S. Issarapanacheewin (Radioactive Waste Management Center, Thailand Institute of Nuclear Technology (Public Organization)) ;
  • K. Yubonmhat (Radioactive Waste Management Center, Thailand Institute of Nuclear Technology (Public Organization)) ;
  • W. Silpradit (Radioactive Waste Management Center, Thailand Institute of Nuclear Technology (Public Organization)) ;
  • W. Katekaew (Radioactive Waste Management Center, Thailand Institute of Nuclear Technology (Public Organization)) ;
  • N. Prasertchiewchan (Radioactive Waste Management Center, Thailand Institute of Nuclear Technology (Public Organization))
  • 투고 : 2022.05.09
  • 심사 : 2022.10.07
  • 발행 : 2023.02.25
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초록

The co-precipitation process plays a key role in the decontamination of radionuclides from low and intermediate levels of liquid waste. For that reason, the removal of Cs ions from waste solution by the co-precipitation method was carried out. A simulated liquid waste (133Cs) was prepared from a 0.1 M CsCl solution, while wastewater generated by washing steel ash served as a representative of radioactive cesium solution (137Cs). By co-precipitation, potassium ferrocyanide was applied for the adsorption of Cs ions, while nickel nitrate and iron sulfate were selected for supporting the precipitation. The amount of residual Cs ions in the CsCl solution after precipitation and filtration was determined by ICP-OES, while the radioactivity of 137Cs was measured using a gamma-ray spectrometer. After cesium removal, the amount of cesium appearing in both XRD and SEM-EDS was analyzed. The removal efficiency of 133Cs was 60.21% and 51.86% for nickel nitrate and iron sulfate, respectively. For the ash-washing solution, the removal efficiency of 137Cs was revealed to be more than 99.91% by both chemical agents. This implied that the co-precipitation process is an excellent strategy for the effective removal of radioactive cesium in waste solution treatment.

키워드

과제정보

The authors would like to acknowledge the support provided by the Nuclear Technology Research and Development Center, Thailand Institute of Nuclear Technology (Public Organization) for the analysis of ICP-OES and XRD. This work was financially supported by Thailand Science Research and Innovation (TSRI).

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