Biological oxygen production by photosynthesis
The photosynthesis of a mature tree can produce sufficient oxygen to support 2 humans. While doing this, it also absorbs carbon dioxide. However, there are obviously a range of impracticalities related to maintaining trees on board a spacecraft. Algal biomass was therefore chosen as a more efficient mechanism for oxygen generation.
This algal biomass system has 3 main functions:
(1) Production of oxygen
(2) Absorption of carbon dioxide
(3) Production of food
The system is, however, limited in that it can only work while we remained sufficiently close to the sun.
Description of the algal biomass system:
Explanation of the science of photosynthesis used:
Technical specifications (e.g. size, mass of algae required, temperature, etc.)
Non-biological oxygen production
When distant from sunlight electrolysis of water will be used for oxygen production. This is a process that requires large amounts of electrical energy.
How much?
An adult human needs approximately 0.8kg of oxygen per day (depending on activity level).
How much electrical power / energy is required to support this level of oxygen production for the whole crew by electrolysis of water?
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