Resource recovery is one of the most crucial aspects of long-term survival in interplanetary space travel, and a key aspect of resource recovery lies in urine processing for a potable source of water. Currently, there is a need for an independent, energetically efficient process that achieves a high efficiency of water recovery without a high degree of cleaning problems. Through research initiatives, LiFT technology has taken several forms in the freeze-thaw and in the sublimation regime. While both sides have their own advantages and disadvantages, the former has proven itself as a more efficient process technology. A freeze-thaw technique known as freeze concentration seems to be the optimal method for water extraction from urine. Freeze concentration is a low energy process that focuses on the nucleation of pure ice crystals followed by a ripening effect of those crystals and subsequent washing to achieve high extraction efficiencies. A theoretical water recovery value of approximately 90% has been determined based on the eutectic points of urine constituents. This research effort will focus on four aspects of freeze concentration as follows: Detailed evaluation of inorganic contaminant migration to product ice/water; Detailed evaluation of organic contaminant migration to product ice/water; Detailed evaluation of possible biological contaminant migration to product ice/water; Detailed evaluation of biocidal impacts during freeze concentration
Related Documents:WM1, WM2, WM3, WM8
Document Provided By:
James E. Alleman
Date of this Version
ALS NSCORT Project Number
Project 1 - Solid Thermophilic Aerobic Reactor (STAR)
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Internal Documents: Management: External Advisory
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