Abstract
In this study cultivated minute algae in high density, and it used the technique which fixed CO_2. Time series observation of CO_2 and pH,ORP was carried out in order to observe the photosynthetic reaction by minute algae. As the result, it was shown that rise and descent were repeated pH and CO_2 in order to utilize for the organic synthesis. 2.1 g per minute algae of 1 g was fixed the immobilization of CO_2 by minute algae. The treatment experiment of CO_2 was carried out by microorganism and minute algal biomass equipment. By the biological treatment, drainage middle organic substance formed 200mg/L CO_2. In the minute algae tank, CO_2 of about 30% was removed.
