ALGAE CULTIVATION METHOD AND PRODUCTION METHOD FOR OSMOTIC PRESSURE REGULATOR

摘要

An algae culture method capable of efficiently producing an osmotic pressure adjusting substance, a production method of the substance, and an algae culture method for recovering carbon dioxide from a mixed gas containing carbon dioxide and sulfurous acid gas. The methods involve preparing a plurality of enrichment cultures each containing betaine by culturing a culture of microalgae derived from an environmental specimen under a photoautotrophic condition and under a plurality of culture conditions; making a cultivation plan in which an optimum enrichment culture suitable for a main culture is selected from the plurality of enrichment cultures; producing a main culture that contains betaine under the photoautotrophic condition and a salt concentration of 10 wt. % or more; and separating betaine. In the main culture, the algae containing betaine are cultured while the mixed gas containing sulfurous acid gas and carbon dioxide is blown to a culture solution of the algae.

主权项

1. An algae culture method, comprising:
an enrichment culture preparation step for preparing a plurality of enrichment cultures each including microalgae that contain betaine or glucosyl glycerol in an amount of 1 wt. % or more on a dry weight basis and having a different dominant species in microalgae flora by culturing an environmental specimen or a culture of microalgae derived from the environmental specimen under a photoautotrophic condition under a plurality of different culture conditions that include at least one of a temperature condition, a pH condition, and a salt concentration condition in which a final salt concentration in a culture is adjusted to 10 wt. % or more and 30 wt. % or less; a step of making cultivation plan in which an optimum enrichment culture is selected from the plurality of enrichment cultures responding to an estimated temperature change and pH change caused in a medium during a main cultivation, and a series of culturing operations during the main cultivation are planned; and a main cultivation step for producing a main culture that contains the microalgae containing the betaine or the glucosyl glycerol in an amount of 1 wt. % or more on a dry weight basis by performing a main cultivation under the photoautotrophic condition and the salt concentration condition of 10 wt. % or more following the cultivation plan.