POSCEA3: A SuperCritical Water Oxidation process to destroy organic liquid and solid waste

J.-C. Ruiz (1) , Agnès Grandjean (1) , A. Leybros (1) , H. A. Turc (1) , J. Tronc-Reynard (1) , P. Venditti (1)

1 CEA-DES (ex-DEN) - CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire)

In case of organic liquid waste treatment, SuperCritical Water Oxidation (SCWO) offers a promising process to destroy radioactive organic liquids. Under supercritical conditions (P> 22.1 MPa ; T> 647 K), water, organic compounds and gases are completely miscible enabling a fast and complete oxidation reaction. Ionic contaminants remained in the aqueous effluent can be further recovered, for example by conventional precipitation or adsorption processes, leading to a decontaminated final aqueous effluent. The gases generated by this low temperature process are only CO$_2$, O$_2$ and N$_2$, without producing by-products such as NOx or SOx compared to other thermal oxidation processes.

Keywords: POSCEA3; Supercritical water oxidation; continuous reactors; batch reactor

Domains: Nuclear Experiment [nucl-ex]; Nuclear Theory [nucl-th]

J.-C. Ruiz, Agnès Grandjean, A. Leybros, H. A. Turc, J. Tronc-Reynard, et al.. POSCEA3: A SuperCritical Water Oxidation process to destroy organic liquid and solid waste. DEM 2018 - Dismantling Challenges Industrial Reality, Prospects and Feedback Experience, Oct 2018, Avignon, France. ⟨cea-02338581⟩