Dear Manzi, why do you want to remove CO2 from microalgae culture? If you are cultivating autothrophically it could be an issue only in absence of light when microalgae perform only respiration (in that case the lack of oxigen is an issue). But usually you must add CO2 to keep pH at optimum levels and to give carborn for photosyntesis. If you are performing eterothrophic culture it is important to give oxigen to the culture and CO2 became useful only for pH stabilization. Please can you detail your question? Regards. L

Perhaps the algae could be fed CO2 from a carbon-based-fuel-powered (for example, wood-powered, coal-powered, petroleum-powered, or natural-gas-powered) facility. This would provide optimum CO2 levels for maximum photosynthetic efficiency of the algae. The CO2 would then be converted into carbon-based high-free-energy compounds by the algae, which could be used as food and/or fuel. Ambient atmospheric levels of CO2, even with the increase from pre-industrial levels of 280 ppm to current levels of 405 ppm to 410 ppm, are still well below the optimum for photosynthesis. But enhancing CO2 levels for the algae with CO2 from a carbon-based-fuel-powered facility could bring the CO2 levels for the algae up to optimum.

Dear A

Algae use carbon di-oxide for its photosynthesis which is helpful for its growth. So, if you put adequate algae in a closed vessel it will absorb carbon di-oxide. But this should take place during the presence of light. Algae emits carbon di-oxide during its respiration. In absence of light photosynthesis does not take place which results in abundance of carbon di oxide in a closed chamber.