NASA proposes algae-to-energy system utilizing ocean-based, semi-permeable bags utilizing sewage as a nutrient source

Officials at NASA have proposed an algae-based solution for the production of biofuels in closed plastic bags that would be filled with sewage that the algae would utilize as a feedstock, and produce algal oil. NASA said that the proposal addressed a major limitation of closed bioreactor systems on land, which is water-storage and temperature control in addition to land acquisition. The semi-permeable membranes “allow fresh water to flow out into the ocean, while retaining the algae and nutrients,” using a technology that NASA is testing for use in long-duration space flight.

“The algae will feed on the nutrients in the sewage, growing rich, fatty cells. Through osmosis, the bag will absorb carbon dioxide from the air, and release oxygen and fresh water. The temperature will be controlled by the heat capacity of the ocean, and the ocean’s waves will keep the system mixed and active,” said NASA researcher Jonathan Trent.

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