Algae Photobioreactor Life-Support: Balancing Light and Growth in Space

What is an Algae Photobioreactor?

An algae photobioreactor is a closed system designed to cultivate microalgae using light as the energy source. These reactors are crucial for producing biomass, oxygen, and removing carbon dioxide from enclosed environments such as spacecraft or underwater habitats.

The reactor's efficiency depends on several factors including light intensity, nutrient availability, and environmental conditions.

Key Factors Influencing Algae Growth

Light is the primary energy source for algae. The intensity of light affects photosynthesis rates and overall growth. Too little light can limit growth, while too much can cause photoinhibition.

Other factors like CO2 concentration, nutrient availability, and reactor design also play significant roles in determining the productivity and health of the algal culture.

The Monod Growth Model

The Monod model describes how microalgae growth is limited by the availability of light. This model assumes that as light intensity increases, so does photosynthesis until a saturation point is reached.

Beyond this point, additional light has no effect on growth due to self-shading within the reactor.

Beer-Lambert Law and Self-Shading

The Beer-Lambert law quantifies how light intensity decreases as it passes through a turbid medium. In photobioreactors, this means that light intensity diminishes with depth due to the presence of algae cells.

Self-shading occurs when algae cells block each other from receiving direct sunlight, further reducing available light for photosynthesis.

Frequently asked questions

Try it live

Everything above runs in your browser — open Algae Photobioreactor Life-Support Simulator and change the parameters while it is running. Nothing is installed, nothing is uploaded, the whole model lives in one tab.