CELSS (Controlled Ecological Life Support System) is to be considered to construct the closed environment for sustaining the life including human beings without any material supply from outside. Therefore, not only the suitable living conditions such as temperature and humidity should be provided for each bio-species but also the required materials for metabolism of each bio-species are to be supplied and the expelled materials due to metabolism are to completely eliminated and to be recycled for producing the required materials such as oxygen, water and foods.
The suitable environmental conditions such as temperature and humidity can be sassily obtained through the state art of technologies already established, however the material recycling technologies for converting the expelled materials into the required materials to be needed for metabolism are considered not yet to be completely established. And the system configuration for balancing and stabilizing these material circulation is deeply concerned with the recycling technologies mentioned above. In this paper the method for constructing the system configuration is discussed based on the each recycling technology.

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The plant performs an important part in the Controlled Ecological Life Support System (CELSS). For example, plants supply O₂ and remove CO₂ during photosynthesis in addition to providing food. Air pollutants such as NO₂ and NH₃ produced by humans and machines are also growth. In this paper, metabolism by plants of these gases was described by estimating the gas exchange between plant and air. Also, several imaging methods for diagnosing changes in activity were given.

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