Multifiltration Bed Replacement System for the International Space Station using Aquaporin Membranes and Humidity Condensate Ersatz Wastewater



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47th International Conference on Environmental Systems


The Multifiltration Bed system in the International Space Station (ISS) Water Processor Assembly (WPA) needs to be improved by reducing or eliminating the usage rate of expendable media, removing dimethylsilanediol, and reducing the overall system mass. The Multifiltration Bed Replacement technology is a pressure driven biomimetic membrane based system that is being evaluated to replace the function of the Multifiltration Beds in the ISS WPA. Tests were conducted to determine the performance of the Aquaporin Inside™ Hollow Fiber Module at a 98% water recovery ratio. A long-duration test of the membrane was also conducted to determine membrane life. The feed used for testing was the simulated ISS Marshall Space Flight Center humidity condensate ersatz. All tests operated at ambient temperature and a backpressure of 20 psi. Samples were analyzed for total organic carbon, dimethylsilanediol, acetate, ions, and volatiles including ethanol and acetone. The results indicated that at a 97.6% ± 0.47% water recovery ratio, the membrane can reject approximately 50% of the total organic carbon and conductivity. For long-duration testing, the membrane has shown no degradation for 8711.8 hours and testing is ongoing.


Hali Shaw, NASA Ames Research Center, USA
Michael Flynn, National Aeronautics and Space Administration (NASA), USA
David Beeler, Bionetics, USA
Kevin Howard, National Aeronautics and Space Administration (NASA), USA
Jurek Parodi, National Aeronautics and Space Administration (NASA), USA
Brian Kawashima, NASA Ames Research Center, USA
Thomas A. E. Andersen, Danish Aerospace Company (DAC), Denmark
Jörg Vogel, Aquaporin A/S, Denmark
Kim Kleinschmidt, Danish Aerospace Company (DAC), Denmark
ICES303: Physio-Chemical Life Support- Water Recovery & Management Systems- Technology and Process Development
The 47th International Conference on Environmental Systems was held in South Carolina, USA on 16 July 2017 through 20 July 2017.


Multifiltration Beds, water recycling, international space station, humidity condensate, aquaporin, membrane, water channels, total organic carbon, dmsd, dimethylsilanediol