Abstract
In this study, basic cultivation experiments were performed on microalgae Desmodesmus sp, then, the experiment results were deductively expanded, and the use of paddy in the off-season for farmers is advocated. As a result of the continuous culture experiments using 100 mL test tubes, 101.3 mg dry biomass was harvested in the aeration culture using the BG-11 medium. In the aeration culture with mixing CO2, the maximum harvest was obtained under the 10%-CO2 concentration. Considering about CO2 concentration, the condition of 1%-CO2 was superior in CO2 use efficiency. Based on the changes in the pH of the medium, algae such as Desmodesmus sp exchanges ions between the inside of the cell and the surrounding environment, and changes the surrounding environment in order to adapt themselves. In the proforma calculation of second crops in paddy fields, 26.4 million tons dry biomass is harvested in 120 days long of culture a year. Considering that the harvested dry biomass amount, 187 × 106 GJ power energy is obtained by burning them. This amount of energy corresponds to about 5.2% of total electricity.
Highlights
Photosynthesis is the root of life on the earth
Microalgae like Desmodesmus sp. is thought to exchange ions between the inside of the cell and the surrounding environment and adapt itself to the optimum environment in order to adapt to the surrounding environment
Normalizing by the supplied CO2, the highest efficiency of CO2 (dry mass (g)/total CO2 (g) ×100%) was obtained under the natural air blowing in which CO2 concentration is 0.04%
Summary
Photosynthesis is the root of life on the earth. This paper presents the concept of converting carbon dioxide by solar energy into a flammable energy source, with emphasis on the biological properties of green algae. These properties, acquired through long geological ages, effectively result in a photosynthetic reaction by greener lives by consuming minimum amount of energy. In the earliest era of terrestrial life, plants were starting to live in the water and they are presumed to have developed a mechanism of photosynthesis that uses solar energy. It’s thought that the life had adopted the condition of that era’s water component, temperature, and acidity. Green algae are known for having the ability to live in a wide range of pH environments
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