| タイトル | Ion Exchange Technology Development in Support of the Urine Processor Assembly Precipitation Prevention Project for the International Space Station |
| 本文（外部サイト） | http://hdl.handle.net/2060/20120006121 |
| 著者（英） | Casteel, Michael; Callahan, Michael; Broyan, James L.; Carrier, Chris; Adam, Niklas; Pickering, Karen D.; Mitchell, Julie L. |
| 著者所属（英） | NASA Johnson Space Center |
| 発行日 | 2012-07-15 |
| 言語 | eng |
| 内容記述 | In support of the Urine Processor Assembly Precipitation Prevention Project (UPA PPP), multiple technologies were explored to prevent CaSO4 2H2O (gypsum) precipitation during the on-orbit distillation process. Gypsum precipitation currently limits the water recovery rate onboard the International Space Station (ISS) to 70% versus the planned 85% target water recovery rate. Due to its ability to remove calcium cations in pretreated augmented urine (PTAU), ion exchange was selected as one of the technologies for further development by the PPP team. A total of 13 ion exchange resins were evaluated in various equilibrium and dynamic column tests with solutions of dissolved gypsum, urine ersatz, PTAU, and PTAU brine at 85% water recovery. While initial evaluations indicated that the Purolite SST60 resin had the highest calcium capacity in PTAU (0.30 meq/mL average), later tests showed that the Dowex G26 and Amberlite FPC12H resins had the highest capacity (0.5 meq/mL average). Testing at the Marshall Spaceflight Center (MSFC) integrates the ion exchange technology with a UPA ground article under flight-like pulsed flow conditions with PTAU. To date, no gypsum precipitation has taken place in any of the initial evaluations. |
| NASA分類 | Life Sciences (General) |
| レポートNO | JSC-CN-26714
JSC-CN-26133 |
| 権利 | Copyright, Distribution as joint owner in the copyright |
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