A mixture of ammonium hydroxide with acetic acid and a slurry of human feces, urine, and wipes were used as CELSS model wastes to be wet-oxidized at temperatures from 250 to 500 C, i.e. below and above the critical point of water (374 C and 218 kg/sq cm or 21.4 MPa). The effects of oxidation temperature ( 250-500 C) and residence time (0-120 mn) on carbon and nitrogen and on metal corrosion from the reactor material were studied. Almost all of the organic matter in the model wastes was oxidized in the temperature range from 400 to 500 C, above the critical conditions for water. In contrast, only a small portion of the organic matter was oxidized at subcritical conditions. A substantial amount of nitrogen remained in solution in the form of ammonia at temperatures ranging from 350 to 450 C suggesting that, around 400 C, organic carbon is completely oxidized and most of the nitrogen is retained in solution. The Hastelloy C-276 alloy reactor corroded during subcritical and supercritical water oxidation.


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    Title :

    Subcritical and supercritical water oxidation of CELSS model wastes


    Contributors:
    Takahashi, Y. (author) / Wydeven, T. (author) / Koo, C. (author)


    Publication date :

    1989-01-01



    Type of media :

    Miscellaneous


    Type of material :

    No indication


    Language :

    English




    Subcritical and supercritical water oxidation of CELSS model wastes

    Takahashi, Y. / Wydeven, T. / Koo, C. | Elsevier | 1989


    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


    NASA Celss Program

    M. M. Averner | NTIS | 1990