Sustainable Advanced Oxidation Method for Long Duration Missions Workshop Notes
"Explore a sustainable method using E-Beam for treating air, water, and wastewater in long-duration missions, addressing health concerns and maximizing crew health. Consideration of goals, concepts, and advantages of the advanced oxidation method are discussed. References from NASA and dissertation included."
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Sustainable Advanced Oxidation Method for Long Duration Missions Treatment of Air, Water, and Wastewater Workshop Notes To Jefferson Laboratory Technology Stewardship Event Accelerators: Driving Applications for Society December 17, 2018 Abstract Given the need for long term missions in microgravity, a sustainable method is identified for the radiolysis of air, water and wastewater using an E-Beam is considered. The method would provide disinfection for elimination of adverse microbial communities, and other contaminants potentially found in the drinking water system. A brief consideration of the goal and concepts along with advantages and disadvantages are presented.
Long Duration Missions Potential Health Concern Sources - Characteristics: Emergent or Opportunistic Microbial Communities Erosion / Corrosion / Leaching System products Flora used for long term food source Natural contaminants from off-world sources Contamination from unexpected toxic pollutants (fire) 2
Accepted Goal and Concepts Goal: Maximize Crew Health Essential Sterility (1) Safety System use in microgravity environment Multi-Barrier Approach Disinfectant Monitoring Byproduct management Sustainability Servicing / Maintenance / Reliability Minimal Resupply Reduced Operational Hazards Fate of chemicals and byproducts in the process 3
Advanced Oxidation Method Radiolysis (E-Beam) Ionization Event Reaction on a time scale 10-17 seconds Producing the following radicals: H2O [2.8] OH + [0.62] H + [2.8]e-aq + [0.47]H2 + [0.73]H2O2 + [2.8]H+ Where the [#] = [G] = number of free radicals, molecules / 100 eV (2) Given: A production of oxidants for use in destructing harmful contaminants in an aqueous, solid or air medium and for use as a disinfectant by the push of a button: Disadvantages Advantages Mass Power Shielding Reliable No need for tanks of chemicals Controlled Operation Reduced volume/area needed 4
References (1) Space Station Water Quality Report, Conference Report, NASA-TM-105075, March 1987. (2) Halonitromethane Treatment using Advanced Oxidation Process: Rates, Mechanisms, and Kinetic Modeling, Old Dominion University, Doctoral Dissertation by S. K. Cole, 2005. 5
