Ref ID : 1063
Inamori Yuhei, Hayashi Norio, and Sudo Ryuichi; [Experimental studies on the role of smaller animals with regard to the degradation of AOKO]. Jap.J.Water Treat.Biol. 24(1):59-69, 1988
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Bio-film treatment process has been applied to the drinking water treatment plant used polluted lake water as source of water supply. It is said that this pocess have effect on removal and degradation of algae. But the role of smaller animals such as Rotatoria Philodina erythrophthalma and Oligochaeta Aeolosoma hemprichi inhabit in the bio-film has not been made clear yet sufficiently. Therefore, in this study, we spotlighted to these Rotatoria and Oligochaeta as smaller animals on the degradation of AOKO (blue-green algal blooms), and then some experiments using these smaller animals in aerobic conditions with and without illuminations were made. The results may be summarised as follows. (1) The degradation of AOKO was promoted efficiently in dark conditions without photosynthesis. (2) Existence of P. erythrophthalma and A. hemprichi promoted degradation of AOKO under both dark and light conditions. (3) Since detritus feeder A. hemprichi feeds flocculated AOKO, and filter feeder P. erythrophthalma feeds dispersed AOKO deflocculated by A. hemprichi ingestion, co-existence is much effective to promotly degradate the flocculated AOKO observed in the eutrophic lake. (4) The existence of smaller animals had direct and indirect functions to digradate AOKO. Direct one is degradation of AOKO, and indirect one is activation of total ecosystem through the food chain by increase of dissolved organic matter with degradation of AOKO.