title: Sources and processing of CELSS wastes.
abstract: The production rate and solid content of waste streams found in a life support system for a space habitat (in which plants are grown for food) are discussed.  Two recycling scenarios, derived from qualitative considerations as opposed to quantitative mass and energy balances, tradeoff studies, etc., are presented; they reflect differing emphases on and responses to the waste stream formation rates and their composition, as well as indicate the required products from waste treatment that are needed in a life support system.  The data presented demonstrate the magnitude of the challenge to developing a life support system for a space habitat requiring a high degree of closure.
authors.affiliation: Ecosystem Science and Technology Branch, NASA/Ames Research Center, Moffett Field, CA 94035.
authors.forename: T
authors.initials: T
authors.lastname: Wydeven
authors.forename: J
authors.initials: J
authors.lastname: Tremor
authors.forename: C
authors.initials: C
authors.lastname: Koo
authors.forename: R
authors.initials: R
authors.lastname: Jacquez
mesh_terms: D000393:Air Pollutants / Q000032:analysis; D018533:Biomass; D002245:Carbon Dioxide / Q000032:analysis / Q000737:chemistry / Q000378:metabolism; D004391:Dust / Q000032:analysis; D018504:Ecological Systems, Closed; D005243:Feces / Q000737:chemistry; D006801:Humans; D008021:Life Support Systems / Q000295:instrumentation*; D009584:Nitrogen / Q000032:analysis / Q000737:chemistry / Q000378:metabolism; D010944:Plants / Q000378:metabolism; D013026:Space Flight / Q000295:instrumentation*; D018511:Systems Integration; D014556:Urine / Q000737:chemistry; D018505:Waste Management / Q000295:instrumentation / Q000379:methods*; D014866:Waste Products / Q000032:analysis*; D014867:Water / Q000032:analysis / Q000737:chemistry / Q000378:metabolism
chemical_list: D000393:Air Pollutants; D004391:Dust; D014866:Waste Products; D014867:Water; D002245:Carbon Dioxide; D009584:Nitrogen