Evaluation of Aquaporin Membranes Using ISS Humidity Condensate Ersatz Wastewater
On the International Space Station (ISS), distillate from the Urine Processor Assembly (UPA) and humidity condensate from the cabin are processed through a sequence of operations including distillation, filtration, adsorption, ion exchange, and catalytic oxidation. The use of adsorption and ion exchange beds in the Water Processor Assembly (WPA) are one of the main contributors to the resupply mass requirement. Developing improvements to the multifiltration system in order to reduce or eliminate the usage rate of expendable media such as adsorbents and ion-exchange resins is an important part of the evolution of ISS systems for future exploration missions. Development of the ISS Multifiltration Bed Replacement (MFBR) technology is based on a new generation of biomimetic membranes derive their unique characteristics from a protein call an Aquaporin. These membranes are capable of rejecting many semi-volatile organic compounds and were recently commercialized by the company Aquaporin A/S. NASA has conducted several studies on the use of Aquaporin membranes for the rejection of total organic carbon (TOC) of simulated ISS humidity condensate wastewater. Tests were conducted to determine the maximum water recovery ratio, and TOC rejection for both a flat sheet membrane and a membrane module. The results indicate that the aquaporin membrane can reject a minimum of 50% of the TOC using the simulated ISS humidity condensate ersatz, and achieves product water with a TOC value below 30 ppm.
Danish Aerospace Company
ICES303: Physio-Chemical Life Support- Water Recovery & Management Systems- Technology and Process Development
Hali L. Shaw, University of California Santa Cruz, USA
Michael T. Flynn, NASA Ames Research Center, USA
David Beeler, Wyle Labs, USA
Janelle Coutts, Craig Technologies - ESC, Kennedy Space Center, USA
Matthew J. Kayatin, NASA Marshall Space Flight Center, USA
Thomas A. E. Andersen, Aquaporin Space Alliance ApS, Denmark
Jörg Vogel, Aquaporin A/S, Denmark
Ofir Stefanson, Science and Technology Corporation, USA
Jurek Parodi, Science and Technology Corporation, USA
The 46th International Conference on Environmental Systems was held in Vienna, Austria, USA on 10 July 2016 through 14 July 2016.