In preparation of long-duration manned space flight, biological treatment systems have been evaluated for mission specific waste streams consisting of a high-strength gray water. The purpose of the work was to determine the appropriateness of using nitrification and denitrification
to treat the urine-humidity condensate waste stream and to determine the optimal loading rate for the bench scale treatment system. Biological treatment of the high strength graywater was kinetically and stoichiometrically limited. Due to the low C:N ratio of this wastewater (0.85:1), biological
treatment at long HRTs is stoichiometrically limited and may be overcome by adding alkalinity to improve nitrification efficiency and organic carbon to improve denitrification efficiency.
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