title: Waste recycling issues in bioregenerative life support.
abstract: Research and technology development issues centering on the recycling of materials within a bioregenerative life support system are reviewed.  The importance of recovering waste materials for subsequent use is emphasized.  Such material reclamation will substantially decrease the energy penalty paid for bioregenerative life support systems, and can potentially decrease the size of the system and its power demands by a significant amount.  Reclamation of fixed nitrogen and the sugars in cellulosic materials is discussed.
authors.affiliation: Ecosystem Science and Technology Branch, NASA/Ames Research Center, Moffett Field, CA 94035.
authors.forename: R D
authors.initials: RD
authors.lastname: MacElroy
authors.forename: D
authors.initials: D
authors.lastname: Wang
mesh_terms: D018533:Biomass; D050260:Carbohydrate Metabolism; D002241:Carbohydrates / Q000737:chemistry; D002480:Cellulase / Q000737:chemistry / Q000378:metabolism; D002482:Cellulose / Q000737:chemistry / Q000378:metabolism; D018504:Ecological Systems, Closed; D006801:Humans; D006868:Hydrolysis; D008021:Life Support Systems / Q000295:instrumentation*; D009584:Nitrogen / Q000737:chemistry / Q000378:metabolism; D010084:Oxidation-Reduction; D010100:Oxygen / Q000378:metabolism; D013026:Space Flight / Q000295:instrumentation* / Q000639:trends; D018505:Waste Management / Q000379:methods*; D014866:Waste Products; D014867:Water / Q000378:metabolism; D014893:Weightlessness
chemical_list: D002241:Carbohydrates; D014866:Waste Products; D014867:Water; D002482:Cellulose; D002480:Cellulase; D009584:Nitrogen; D010100:Oxygen