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NASA Technical Reports Server (NTRS) 20110023178: Evaluation of Tec... |
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by NASA Technical Reports Server (NTRS) |
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The International Space Station (ISS) Urine Processor |
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Assembly (UPA) experienced a hardware failure in the |
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Distillation Assembly (DA) in October 2010. Initially the |
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UPA was operated to recover 85% of the water from urine |
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through distillation, concentrating the contaminants in |
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the remaining urine. The DA failed due to precipitation |
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of calcium sulfate (gypsum) which caused a loss of UPA |
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function. The ISS UPA operations have been modified to |
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only recover 70% of the water minimizing gypsum |
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precipitation risk but substantially increasing water |
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resupply needs. This paper describes the feasibility |
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assessment of several technologies (ion exchange, |
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chelating agents, threshold inhibitors, and Lorentz |
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devices) to prevent gypsum precipitation. The feasibility |
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assessment includes the development of assessment |
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methods, chemical modeling, bench top testing, and |
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validation testing in a flight-like ground UPA unit. Ion |
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exchange technology has been successfully demonstrated |
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and has been recommended for further development. The |
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incorporation of the selected technology will enable |
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water recovery to be increased from 70% back to the |
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original 85% and improve the ISS water balance. |
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Date Published: 2016-11-07 18:35:26 |
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Identifier: NASA_NTRS_Archive_20110023178 |
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Item Size: 652592 |
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Language: english |
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Media Type: texts |
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