Abstract
The large-scale experimental channels were constructed in course of the Takaya-gawa river which a branch of the Ashida river, in Fukuyama-city. The purification effects of polluted river water were estimated by several kinds of materials in the field experiments. By bio-active characteristics of three contact oxidation channels which paved with coral stone, deoiling coal and charcoal, the experimental results were discussed. The water conduction period of each season was made about 3 weeks all through in autumn, winter, spring, summer during 11.1997-8.1998.For SS, BOD, the purifying effect of coral atone was most excellent, and the purifying effect of charcoal was higher than other materials for T-P. On the epiphytic algae, there was seldom a difference of three contact materials, and it has been almost composed of the same kind.
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