Hydrothermal oxidation of radioactive combustible waste

This work presents the supercritical water oxidation (SCWO) of quinoline, a nitrogen-containing organic compound found in pharmaceutical wastewaters, to products that are more readily biodegradable. The effects of the operating variables, namely process temperature, stoichiometric ratio of oxidant to organic, residence time and system pressure were studied in order to optimise quinoline removal efficiency and to investigate the fate of carbon and nitrogen after oxidation. Hydrolysis experiments undertaken in the range 480-650• C showed no significant degradation of quinoline. The present study confirmed that, as an alternative to incineration, the process is fast and effective in treating quinoline in water, converting it into primarily carbon dioxide (CO 2 ), water (H 2 O) and nitrogen gas (N 2 ) and to a lesser extent ammonium ions (NH 4 + ). Temperature was shown to be the primary variable in the complete destruction of quinoline and TOC reduction, upon operating at around 250 bars. Essentially, complete quinoline removal was observed above 575• C and complete TOC removal was obtained at 650• C, where CO 2 was the main reaction product.

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Supercritical water oxidation of quinoline in a continuous plug flow reactor—part 1: effect of key operating parameters

Pinto

Santos

Al‐Duri

et al. 2006

J of Chemical Tech & Biotech

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Experimental study on treatment of mixed ion exchange resins by supercritical water gasification

Wang

Chen

Cui

et al. 2023

Journal of Cleaner Production

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Treatment of spent ion exchange resins: Comparison between hydrothermal and acid leaching processes

Leybros

Ruiz

D’halluin

et al. 2020

Journal of Environmental Chemical Engineering

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Hydrothermal oxidation of radioactive combustible waste

Cited by 17 publications

References 3 publications

Supercritical water oxidation of quinoline in a continuous plug flow reactor—part 1: effect of key operating parameters

Supercritical water oxidation of quinoline in a continuous plug flow reactor—part 1: effect of key operating parameters

Experimental study on treatment of mixed ion exchange resins by supercritical water gasification

Treatment of spent ion exchange resins: Comparison between hydrothermal and acid leaching processes

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