Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2015, Vol. 26 ›› Issue (3): 030601 doi: 10.13538/j.1001-8042/nst.26.030601

• NUCLEAR ENERGY SCIENCE AND ENGINEERING • Previous Articles     Next Articles

Supercritical water oxidation of spent extraction solvent simulants

WANG Shuai, QIN Qiang, CHEN Kun, XIA Xiao-Bin,MA Hong-Jun,QIAO Yan-Bo,and HE Liu-Bin   

  1. Center for Thorium Molten Salt Reactor System, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
  • Contact: XIA Xiao-Bin E-mail:xiaxiaobin@sinap.ac.cn
  • Supported by:

    Supported by the “Strategic Priority Research Program” of the Chinese Academy of Sciences (No. XDA02050000)

WANG Shuai, QIN Qiang, CHEN Kun, XIA Xiao-Bin, MA Hong-Jun, QIAO Yan-Bo, and HE Liu-Bin . Supercritical water oxidation of spent extraction solvent simulants.Nuclear Science and Techniques, 2015, 26(3): 030601     doi: 10.13538/j.1001-8042/nst.26.030601

Abstract:

The rapid development of nuclear technology has led to more liquid organic radioactive wastes. Different from the regular aqueous radioactive wastes, these liquids possess a higher hazard potential and cannot be disposed through the conventional methods due to their radioactivity and chemical nature. Spent extraction solvent is a kind of common liquid organic radioactive wastes. In this work, tri-butyl phosphate (TBP), which is more difficult to degrade in the spent extraction solvent, was used as the model compound. Influences of reaction conditions on total organic carbon (TOC) removal and the volume percentage of each gas component under supercritical water oxidation (SCWO) were studied. The SCWO behaviors of spent extraction solvent simulants were studied under the optimal conditions derived from the TBP experiment. The SCWO experiments were studied at 400–550 °C, oxidant stoichiometric ratio of 0–200%, feed concentration of 1.5%–4% and pressure of 25 MPa for 15–75 s. The results show that the TOC removal of the simulants was greater than 99.7% and CH4, H2 and CO were not detected at 550 C, 25 MPa, oxidant stoichiometric ratio of 150%, feed concentration of 3%, and residence time of 30 s.

Key words: Supercritical water oxidation, Liquid organic radioactive wastes, Spent extraction solvent, TBP