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Record 21 of 3473
Distillation and Air Stripping Designs for the Lunar Surface
Author and Affiliation:
Boul, Peter J.(NASA Johnson Space Center, Houston, TX, United States)
Lange, Kevin E.(NASA Johnson Space Center, Houston, TX, United States)
Conger, Bruce(NASA Johnson Space Center, Houston, TX, United States)
Anderson, Molly(NASA Johnson Space Center, Houston, TX, United States)
Abstract: Air stripping and distillation are two different gravity-based methods, which may be applied to the purification of wastewater on the lunar base. These gravity-based solutions to water processing are robust physical separation techniques, which may be advantageous to many other techniques for their simplicity in design and operation. The two techniques can be used in conjunction with each other to obtain high purity water. The components and feed compositions for modeling waste water streams are presented in conjunction with the Aspen property system for traditional stage distillation models and air stripping models. While the individual components for each of the waste streams will vary naturally within certain bounds, an analog model for waste water processing is suggested based on typical concentration ranges for these components. Target purity levels for the for recycled water are determined for each individual component based on NASA s required maximum contaminant levels for potable water Distillation processes are modeled separately and in tandem with air stripping to demonstrate the potential effectiveness and utility of these methods in recycling wastewater on the Moon. Optimum parameters such as reflux ratio, feed stage location, and processing rates are determined with respect to the power consumption of the process. Multistage distillation is evaluated for components in wastewater to determine the minimum number of stages necessary for each of 65 components in humidity condensate and urine wastewater mixed streams. Components of the wastewater streams are ranked by Henry s Law Constant and the suitability of air stripping in the purification of wastewater in terms of component removal is evaluated. Scaling factors for distillation and air stripping columns are presented to account for the difference in the lunar gravitation environment. Commercially available distillation and air stripping units which are considered suitable for Exploration Life Support are presented. The advantages to the various designs are summarized with respect to water purity levels, power consumption, and processing rates.
Publication Date: Jan 01, 2009
Document ID:
20090040377
(Acquired Nov 20, 2009)
Subject Category: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
Report/Patent Number: JSC-CN-19220
Document Type: Conference Paper
Meeting Information: 40th International Conference on Environmental Systems; 11-15 Jul. 2010; Barcelona; Spain
Meeting Sponsor: American Inst. of Aeronautics and Astronautics; Reston, VA, United States
Financial Sponsor: NASA Johnson Space Center; Houston, TX, United States
Organization Source: NASA Johnson Space Center; Houston, TX, United States
Description: 1p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: AIR PURIFICATION; DISTILLATION; LIFE SUPPORT SYSTEMS; LUNAR BASES; STRIPPING (DISTILLATION); WASTE WATER; WATER TREATMENT; WATER CONSUMPTION; POTABLE WATER; CONTAMINANTS; RECYCLING
Availability Source: Other Sources
Availability Notes: Abstract Only
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