Abstract Controlled-Ecological-Life-Support-System (CELSS) model wastes were wet-oxidized at temperatures from 250 to 500°C, i.e., below and above the critical point of water (374°C and 218 kg/cm2 or 21.4 MPa). A solution of ammonium hydroxide and acetic acid and a slurry of human urine, feces, and wipes were used as model wastes. Almost all of the organic matter in the model wastes was oxidized in the temperature range from 400 to 500°C, i.e., above the critical conditions for water. In contrast, only a small portion of the organic matter was oxidized at subcritical conditions. Although the extent of nitrogen oxidation to nitrous oxide (N2O) and/or nitrogen gas (N2) increased with reaction temperature, most of the nitrogen was retained in solution as ammonia near 400°C. This important finding suggests that most of the nitrogen in the waste feed can be retained in solution as ammonia during oxidation at low supercritical temperatures and be subsequently used as a nitrogen source for plants in a CELSS while at the same time organic matter is almost completely oxidized to carbon dioxide and water. It was also found in this study the Hastelloy C-276 alloy reactor corroded during waste oxidation. The rate of corrosion was lower above than below the critical temperature for water.


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    Titel :

    Subcritical and supercritical water oxidation of CELSS model wastes


    Beteiligte:
    Takahashi, Y. (Autor:in) / Wydeven, T. (Autor:in) / Koo, C. (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    01.01.1989


    Format / Umfang :

    12 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



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    Sources and processing of CELSS wastes

    Wydeven, T. / Tremor, J. / Koo, C. et al. | NTRS | 1989


    Sources and processing of CELSS wastes

    Wydeven, T. / Tremor, J. / Koo, C. et al. | Elsevier | 1989


    Wet-Oxidation Waste Management System for CELSS

    Ohya, Haruhiko / Takahashi, Yukio | SAE Technical Papers | 1985


    CELSS transportation analysis

    Olson, R. L. / Gustan, E. A. / Vinopal, T. J. | NTRS | 1984