Utilization of Hot-Spring-Water-Bound CO 2 for Horticulture Plants Using Incubation Method

Kyohei Yokota ()
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Kyohei Yokota: Department of Civil Engineering, National Institute of Technology, Wakayama College, Gobo 644-0023, Japan

Sustainability, 2023, vol. 15, issue 16, 1-24

Abstract: This study focused on free carbon dioxide (H 2 CO 3 ) contained in volcanic hot spring water. It was clarified whether free carbon dioxide can be emitted into the atmosphere and increase the CO 2 concentration in greenhouses by using the incubation method. Factors influencing the increase in CO 2 concentration were identified based on implementation time in a demonstration experiment, temperature and humidity in the incubator, the amount of hot spring water, and the contact area between the hot spring water and the air. An incubator with an inner volume of 2.17 × 10 7 mm 3 was used in this study. The results showed that unrelated factors were the implementation time in the demonstration experiment, temperature, and humidity. There was a relationship with the amount of hot spring water. The increment of CO 2 concentration in the air by free carbon dioxide increased proportionally by increasing the amount of water. Free carbon dioxide contained in hot spring water can be utilized by considering the volume of facility horticulture and plant factories. The ideal methods for utility are to replace the hot spring water every few minutes and to increase the contact area between the air and the hot spring water.

Keywords: hot spring water; free carbon dioxide; carbon dioxide; facility horticulture; plant factory (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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