摘要：The results of the experiment in cultivating micro planktonic green algae (especially Chlorella) with polluted river waters in Nagoya City are showed in this report. 1) The micro algae Chlorella can be simply caltivated with hard polluted river waters. (3, 000 lux : in the sun light) 2) This cultivated algae suspension contains 105-6 cells of Chlorella per ml (this suspension is called as "algae water"by the author.) 3) The algae could live for more than a week in polluted water without dissolved oxygen, still retain activity, and increase. 4) As far as algae was cultivated under the anaerobic condition at the beginning, the growth, of algae-eating organisms were satisfactorily controlled and the algae species except Chlorella were very few. In this experiment, neither sterilization nor separation of algae species was carried out. Algae species Chlorella was obtained as the dominant species from the polluted river water.
