Carbon Dioxide Separation and Recovery from the Closed Animal Breeding and Habitation Module of the CEEF during Closed Habitation Experiments

In the Closed Ecology Experiment Facilities (CEEF), an artificial ecosystem including crops, Shiba goats, and human inhabitants is to be constructed in order to conduct long-term habitation experiments. For carbon circulation in this artificial ecosystem, CO₂ needs to be recovered from the air of animal breeding and habitation rooms using a CO₂ separator and to be injected into growth chambers for consumption in crop photosynthesis. Moreover, daily crop yield from the growth chambers needs to be stabilized to drive carbon circulation in the artificial ecosystemwithout huge buffers. Because crops are cultivated in a staggered manner, controlling atmospheric CO₂ concentration in the growth chambers at a constant level during light periods throughout crop cultivation is necessary for stabilizing daily crop yield. Our results indicated that atmospheric CO₂ concentration in the growth chambers could be controlled at a constant level during light periods when CO₂ recovered from the animal breeding and habitation rooms using a CO₂ separatorwas injected into the growth chambers. Therefore, we concluded that CO₂ separation capacity was enough for driving carbon circulation in the artificial ecosystem constructed in the CEEF.