Tritiated water removal method based on hydrate formation using heavy water as co-precipitant

Satoshi Nakamura, Toshihiro Awata, Hitoshi Kiyokawa, Haruki Ito, Ryo Ohmura

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


A separation method of tritium has been developed based on co-precipitation of tritiated water on porous heavy water (D2O) based clathrate hydrate. The tritium was semi-continuously removed by a circulating flow of tritium-containing light water through the D2O hydrate media crystallized in advance. The tritium concentration of 4.77 × 105 Bq/kg was reduced to 1.55 × 103 Bq/kg with HFC-134a hydrate at 0.35 MPa for 1 h, while tritiated water treatment at a concentration of 1010 Bq/kg or greater is eligible with the conventional detritiation methods. Near the D2O hydrate surfaces, solid solutions with higher concentrations of tritiated water were deposited on the hydrate substrate than those in the liquid phase. The semi-serialized operation of hydrate based detritiation is capable of high-rate processing as well as energy and resource saving. This method could be a candidate treatment for huge quantities of water with low concentration tritium discharged from nuclear fusion power generation system.

Original languageEnglish
Article number142979
JournalChemical Engineering Journal
Publication statusPublished - 2023 Jun 1


  • Clathrate hydrate
  • Coprecipitation
  • Crystallization engineering
  • Heavy water
  • Tritium separation

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering


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