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isolated steps which are only allowed to interact in restricted, controllable ways: -Liquefaction compartment -Photoheterotrophic compartment -Nitrifying compartment -Photoautotrophic compartment (separate algae … For instance, CO2 level can be optimized independently for O2 production in the algae compartment and for food production in the higher plants compartment. …

See How much algae would you need to fully support a person? … for details PS: Shepelev calculated 30 liters would be enough, but "The oxygen content initially produced by the algae plummeted rapidly by the close of the first day" https://kk.org/mt-files/outofcontrol …

Joel from "JoelCreates" tested this and has almost managed to reach equilibrium by using 4 x 50 gallon tanks full of algae, all of which needs a lot of light and airflow. …

Light is toxic to the photosynthetic enzymes in algae. … The algae themselves attenuate light so either algae density needs to be low (lots of medium) or LEDs must be close together (lots of LEDs). Algae are not very efficient at converting light to O2. …

Oxygen production output must be increased in anticipation of a period of reduced power availability for the algae tanks. How do you manipulate your tanks of goop? … Multiply this by the thousands of other reactions in the algae cell and you have a very large number of failure modes. …

For example, algae are size-efficient due to doubling time and photobioreactor size; however, the tank may be more susceptible to failure than a robust plant-based crop. …

The mass of the algae itself is trivial compared with the growth medium. Light is toxic to the photosynthetic enzymes in algae. Sunlight needs to either be attenuated or intermittent. … The algae themselves attenuate light so either algae density needs to be low (lots of medium) or LEDs must be close together (lots of LEDs). Algae are not very efficient at converting light to O2. …

Marine Bacteria, algae produce majority of Earth's freely available oxygen. Terrestrial plants produce barely fraction. … Would require you woukd need for one person from approximately 20 kilograms of water and algae. …

See Algae Bioreactor for O2 and CO2 (and food?) - Any data on required size and power requirements? … An algae bioreactor initially seems like a great idea for space travel. It is very elegant to turn waste CO2 and astronaut poop into oxygen and food. …

Algae Growth: For efficiency, the algae need to be constantly held at the optimum combination of temperature, nutrient concentration and algae density. … This means a continuous process of adding nutrients and removing algae, not a batch process. …

The mass of the algae itself is trivial compared with the growth medium. Light is toxic to the photosynthetic enzymes in algae. Sunlight needs to either be attenuated or intermittent. … The algae themselves attenuate light so either algae density needs to be low (lots of medium) or LEDs must be close together (lots of LEDs). Algae are not very efficient at converting light to O2. …

Recently, I saw a video on Cody'sLab, where an “algae panel” was constructed. This is set up like a solar panel and uses algae to convert light and air into food and oxygen. … You can use any algae species you want, however it must of course be edible. …

We should know that here on earth most of our breathable air comes from algae, tang, plankton and bacteria in the oceans. …

As for nitrogen, a similarly slow process of accumulation could be implemented using biological plants or algae and nitrogenous fertilizers. …

Although, there might be some algae or similar that would tolerate the intermittent light. …