Abstract
In this study, in order to apply Multi-Soil-Layering (MSL) method to direct treatment of river, a demonstration experiment of the treatment of Kumazoe river and the ability of water treatment of MSL system was examined for 1 year from December 2000. The MSL method could treat BOD of 6 to 105mg/l (30mg/l in average) in river water up to 2mg/l in average stably throughout year under the condition with high hydraulic loading rate of 4m3/m2/day. Coefficients for removal of pollutants in river water by MSL system were also determined. Durable years of MSL system until the system cause clogging by the accumulation of mineral SS in river water into the system was estimated more than 20 years.
