Production of Electrolysis-Purity Water

Award Information
Agency: National Aeronautics and Space Administration
Branch: N/A
Contract: NNX10CE49P
Agency Tracking Number: 094676
Amount: $99,104.00
Phase: Phase I
Program: SBIR
Awards Year: 2010
Solicitation Year: 2009
Solicitation Topic Code: X3.01
Solicitation Number: N/A
Small Business Information
1585 Marauder Street, Chico, CA, 95973-9064
DUNS: 933302655
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Susana Carranza
 Principal Investigator
 (512) 589-0718
Business Contact
 Susana Carranza
Title: Business Official
Phone: (512) 589-0718
Research Institution
Removal of impurities from water has been studied extensively by NASA in the context of water recovery from wastewater. However, the Water Recovery System and Urine Processor Assembly currently used in the International Space Station can only recover as much as 90% of the water (Carter, 2009). Complete dewatering is not possible for these technologies since they are not designed for handling solids and processing is stopped before precipitates form. The only water recovery process that can handle solids is the Air Evaporation System (AES) which uses porous rayon wicks but its performance is severely limited by its low thermal conductivity and susceptibility to microbial growth. We propose to improve on the AES by designing an evaporation system using thermally conductive porous media. The high surface area and porosity of these porous media coupled with the use of vapor-compression distillation results in a novel system that can recover almost 100% of the water at the desired purity with high energy efficiency and minimal consumables. Makel Engineering and Cornell University are proposing the use of two processes, (1) freeze-concentration and (2) porous media evaporation, to produce water that meets electrolysis purity requirements needed for oxygen production from lunar regolith. While freeze-concentration systems have been shown to be effective in purifying water for terrestrial applications, we believe that our proposed process is the first to power the freezing-melting cycle by a thermoelectric heat pump. Our innovative system will exploit the property of thermoelectrics to reverse their heating and cooling sides, leading to the reuse of the enthalpy of fusion and simple equipment design. In principle, our process will operate at high energy efficiency, recover more than 99% of the water from the feed at the desired purity, and use no consumables.

* Information listed above is at the time of submission. *

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