Capillary structures could provide lower risk water recycling

Rows of small structures

Capillary Evaporator prototype with transparent capillary structures filled with test fluids. Credits: IRPI LLC

Human use a lot of water for drinking and hygiene. Recycling is a key strategy to make the water that is launched into space last longer. Existing water recycling methods in space use harmful chemicals or considerable energy, and do not recycle 100% of the water. Reliability is crucial as well. So the search continues for new approaches to improve the water recycling process.

NASA is considering capillary structures for water recycling. Capillary action involves electrostatic forces literally pulling water through small tubes, similar to how drops of water will hang on objects despite the force of gravity pulling them away. NASA’s capillary structures investigation studies “a new method of water recycling and carbon dioxide removal using structures designed in specific shapes to manage fluid and gas mixtures in microgravity.” The capillary structures equipment is made up of small, 3-D printed geometric shapes and sizes sizes (see above image).

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Airbus ESA Advanced Closed Loop System (ACLS)

Two technicians point to large instrument box.

ACLS technology demonstrator generates oxygen and water in a closed system

The Advanced Closed Loop System (ACLS) is an advanced life support system that has been developed by Airbus for the European Space Agency (ESA) to be used as a technology demonstrator on the ISS, in the Destiny module, from summer 2018. The ACLS will be installed in the HTV-7 space transporter at the Tanegashima Space Center in Japan and is due to be transported to the ISS in August 2018. It is set to be operated for a period of one year.

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Clearing the Air with inXitu

Mars Science Laboratory rover

Mars Science Laboratory

inXitu develops clean-tech air purifiers and portable material analyzers. The technology used in inXitu’s portable rock and mineral analyzer was chosen to fly on the Mars Science Laboratory rover (upper left). inXitu has been developing a low-power, passively-cooled, grounded-anode miniature x-ray source to be deployed in miniaturized instruments for surface and subsurface exploration of the solar system. inXitu is also developing solutions targeted for identification and analysis in the areas of explosives, pharmaceuticals, forensics, art and archaeological materials.

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Clearing the Air with inXitu

Rover on Martian surface

NASA Innovation Partnership Program Director Doug Comstock mentioned inXitu Inc. as an example of an innovative partnership with NASA at the August 5th CoLAB presentation in San Francisco. inXitu develops clean-tech air purifiers and portable material analyzers. The technology used in inXitu’s portable rock and mineral analyzer was chosen to fly on the Mars Science Laboratory rover (upper left) scheduled for launch in 2009.

 

inXitu has been developing a low-power, passively-cooled, grounded-anode miniature x-ray source to be deployed in miniaturized instruments for surface and subsurface exploration of the solar system. inXitu is also developing solutions targeted for identification and analysis in the areas of explosives, pharmaceuticals, forensics, art and archaeological materials. inXitu‘s new line of instruments will offer performance comparable to laboratory-sized systems with the benefit of portability, significantly reduced sample preparation and reduced cost.

inXitu is also developing a line of low-cost, electronic, pollution prevention devices (PPDs) that will preemptively eliminate nearly all toxic and noxious pollutants from ever entering the atmosphere. Originally designed for NASA as an air purifier for space station use, inXitu has re-engineered the PPDs to provide a simple low-cost device for tackling a wide array of pollutants. inXitu will introduce production units that will be fitted to manufacturing lines, residential air-conditioning units and anywhere highly purified air is needed. Hospitals can use them to provide a safe pathogen free environment for operating rooms and gas stations can fit them on storage tank vents to eliminate a major source of hydrocarbon release.

inXitu’s pollution prevention devices utilize an advanced electron beam source that cleanses air with high-energy electrons. Electron bombardment has proven to be effective in removing a wide spectrum of chemical and biological pollutants. Electron beam systems have a significant advantage over conventional volatile organic compound (VOC) and odor control technologies. The process requires less energy than other purification methods, generates no additional CO2, requires no additional reagents and does not produce any solid or hazardous waste. The breakthrough to meet the restrictive cost, weight and reliability requirements of commercial passenger aircraft and manned space exploration was to replace the thermionic cathode electron emitter with a carbon nanotube (CNT) field emission cathode.

Mslchemin2_5NASA and inXitu each had technology the other party desired. This mutual interest formed the basis of a series of Small Business Innovative Research (SBIR) agreements. Such partnerships allow NASA to share the costs of creating new technology by helping to fund similar research by small businesses. SBIR agreements provide small businesses with critical early stage financing to research new technologies that may not be ripe enough to attract venture capital funding. Regarding the importance of SBIR agreements, inXitu “couldn’t have done it without them,” according to inXitu CEO Scott Snyder. inXitu has developed a series of innovations that has resulted in a corresponding series of new SBIR agreements. In one case, inXitu has even received a coveted SBIR Phase III award due the commercial and strategic importance of some of its technology.

Although the SBIR program is a good way to fund initial development of new technologies, a key barrier is the much greater financing often required for the technology to be developed for commercial use. NASA-initiated venture capital fund Red Planet Capital (aka Astrolabe Ventures) could help provide some of this funding, and other venture capital firms are beginning to be more accepting of environmental technologies.

Middle right: Mars Science Laboratory Chemistry & Mineralogy X-Ray Diffraction (CheMin). Images courtesy of the Jet Propulsion Laboratory.

(Originally published in 2008 in our Sustaianble Reentry blog).

ESA Closed Loop Life Support

 

Arc arrrows connecting resources in a circular arrangement

MELIiSSA Loop, courtesy of ESA.

Previous postings have discussed NASA’s Contained Environment Life Support Systems (CELSS), so it’s time to share some of the limelight with the European Space Agency’s MELIiSSA (Micro-Ecological Life Support System Alternative) research program. With MELIiSSA, we bloggers will never need to leave home again assuming there will be a household version someday. All we’ll need is a computer, an internet connection and MELIiSSA, and life will become a carefree, digital bliss.

MELIiSSA “aims to develop the technology required for a future biological life support system for long term manned space missions.” In fact, MELISSA claims to go “further than other recycling systems used on Mir or the International Space Station which purify water and recycle exhaled carbon dioxide”, by attempting to “recycle organic waste for food production.” Most of the pictures of MELISSA are not very pretty, but the MELISSA loop schematic (upper left) illustrates MELISSA’s approach. MELISSA utilizes five compartments that provide an entire ecosystem loop from human food production, to human consumption to recycling human wastes:

Compartment 1: The Liquefying Compartment
Compartment 2: The Photoheterotrophic Compartment
Compartment 3: The Nitrifying Compartment
Compartment 4: The Photoautotophic Compartment
Compartment 5: The Crew

What I like about MELISSA is that technology transfer is a built-in phase of the program (Phase 4). Presently, a great deal of biological waste produced by human is not only completely wasted, but becoming a severe landfill and human health problem. MELISSA techhnology can potentially be both scaled up and down to profitably utilize this waste. MELISSA offers some exciting opportunities.

The ESA claims that a Belgian company has already used MELISSA research to “devise methods to remove as much as 85% of the solid waste left over after waste-water treatment and to convert it into water and methane gas, which can be used to generate electricity.” (See ESA posting). The Phase 4 page lists several other examples. For more information on potential opportunities with MELISSA, see Technology Transfer Programme Office.

Notes:
Quotes are from the MELIiSSA website viewed today, unless otherwise noted.
Image: MELIiSSA Loop, courtesy of ESA.