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This study is one of the on-site experiments on purification of the polluted river-water. The experimental channels were constructed in the Takaya river course which is one of the downstream branch of the Ashida river. In this study, three channels which 60m long, 1m deep and 1m wide were used by reeds, coal-ash grains, and nothing paved. The river water is conducted into 3 channels by pumping during about 6 months, from May to October, 2004. The purification effects were estimated by several items of water quality and biological index, at three points so as upstream (1), midstream (3) and downstream (5) in each channel. In this paper, items such as characteristics of nitrogen and phosphorus were especially considered from both particle component and the dissolved component. Epiphytic algae were evaluated due to those population density, appearance genera, etc.

THE PURIFICATION EFFECTS AND EPIPHYTIC ALGAE INVESTIGATION BY ONSITE TWO CHANNELS WITH PLANTS AND CONTACT OXIDATION MATERIALS