砂礫堆を利用した汚濁河川水浄化のための現地調査

概要

論文の詳細を見る
The ability of sand dunes in a natural river to improve the water quality of polluted river was assessed. Aioi River, one of the branches of Niyodo River, which has relatively high BOD concentration with suspended pulp sludge joins the main stream and the organic load and the turbidity increase are the serious matter of concern from the stand point of the river environment conservation. Some schemes involving waste water treatment plants within the river basin are now formed and at the same time, the natural purification functions of sand dunes become important which decrease the organic load just prior to inflowing the mains stream. Detailed observations were conducted in order to clarify the longitudinal change of indices relating to the organic pollution of the surface flow and the groundwater flow of the sand dunes. Settlement and aerobic degradation of suspended organic matter were observed in the surface flow on the sand dunes because of the relatively low velocity. On the other hand, the influxes of surface water into groundwater below the dunes were negligibly small and the little amount of dissolved matter flux was expected. This is due to the pulp sludge packing of the sand pore. If the suspended sludge is decreased and that on the sand surface removed, it is seemed to be possible to apply the sand dunes to improve the river water quality with the aid of other facility.
高知大学の論文
2003-12-25