title: Material recycling in a regenerative life support system for space use:  its issues and waste processing.
abstract: First, sources of wastes produced in future human activities in space will be discussed.  The quantity and quality of each source will be evaluated.  Secondly, water quality requirements for human safety will be shown.  Then, techniques to be used for processing and/or recycling the wastes to attain the requirements will be listed.  Specific characteristics and limitations of each will be explained.  Last, examples of system configurations of the techniques will be shown.  The material balances will also be calculated.  The issues to be solved will be made clear.
authors.affiliation: Department of Civil Engineering, Niigata University, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Takahashi
authors.forename: K
authors.initials: K
authors.lastname: Tanaka
mesh_terms: D000818:Animals; D018504:Ecological Systems, Closed; D004867:Equipment Design; D006801:Humans; D008021:Life Support Systems / Q000295:instrumentation* / Q000592:standards; D013026:Space Flight; D014865:Waste Disposal, Fluid / Q000295:instrumentation / Q000379:methods; D018505:Waste Management / Q000379:methods* / Q000592:standards; D014866:Waste Products / Q000032:analysis; D014867:Water / Q000032:analysis; D018508:Water Purification / Q000379:methods* / Q000592:standards
chemical_list: D014866:Waste Products; D014867:Water