Ionomer-Membrane Water Processing Apparatus

• Published in: NASA Center for AeroSpace Information (CASI). Misc. Resources
• Main Authors: MacCallum, Taber K, Kelsey, Laura Katrina
• Format: Web Resource
• Language: English
• Published: Hampton NASA/Langley Research Center 04.07.2017
• Subjects: Containment; Contaminants; Drinking water; Partial pressure; Permeability; Polytetrafluoroethylene; Urine; Wastewater; Water purification; Water vapor

This disclosure provides water processing apparatuses, systems, and methods for recovering water from wastewater such as urine. The water processing apparatuses, systems, and methods can utilize membrane technology for extracting purified water in a single step. A containment unit can include an ionomer membrane, such as Nafion.RTM., over a hydrophobic microporous membrane, such as polytetrafluoroethylene (PTFE). The containment unit can be filled with wastewater, and the hydrophobic microporous membrane can be impermeable to liquids and solids of the wastewater but permeable to gases and vapors of the wastewater, and the ionomer membrane can be permeable to water vapor but impermeable to one or more contaminants of the gases and vapors. The containment unit can be exposed to a dry purge gas to maintain a water vapor partial pressure differential to drive permeation of the water vapor, and the water vapor can be collected and processed into potable water.