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Possibility of an industrial application of flagellate algae, particularly some strains of Euglana, which are found most frequently in the polluted sewage ditches where the level of dissolved oxygen in the water was determined no more than one part per million, was studied. Fourty-three strains of Euglena, including a strain of E. sanguinea and 9 strains of other algae, e. g., Chlamydomonas, Pyrobotrys, Gonium, Pandorina and Haematococcus, were isolated from the water as axenic cultures, by means of the washing technique. Most isolates could propagate under certain anaerobic conditions so far as appropriate amounts of organic nutrients and light were supplied. In the head space of the closed culture in a vacuum ampoule, small amounts of CO_2 and O_2 were detected. The growth responce to the kinds and concentrations of nutrients varied among the strains. It was striking that Pyrobotrys. sp. and Ochromonas danica propagated abundantly in organic media containing more than 8% glucose. Some flagellates, e. g., Euglena gracilis and Ochromonas danica, were more resistant to bacterial contaminations than the non-flagellated green algae in the closed system. Eugleana gracilis consumed up to 1.5% glucose photoheterotrophically within 10 days without aeration, giving a yield of 0.33% on the medium of dried cell materials, which contained about 52% crude protein and 26% crude fats. Under the same conditions, about 80% COD was eliminated from a sewage model. The advantages of seeding these flagellates were discussed for accomplishing a high degree of sewage purification together with the production of a single cell protein by the non-aerated treatment deviced from the results above mentioned.
社団法人日本生物工学会の論文
1970-07-25

鞭毛藻の工業的利用の可能性について

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