Abstract
Granulated coal ash (GCA) has been scattered over 1.5 km in the Kyobashi River locates in the central part of Hiroshima City, for improving water and sediment environments. Flourish algae has grown on the upper part of GCA layer, suggesting the restoration of ecosystem. The main components of GCA are oxidants such as SiO2 and CaO. Thus, the dissolution of GCA can supply minerals such as Ca and Si with a high rate. Si can be supplied from the dissolution of SiO2 in noncrystalline glass existing in GCA. The purpose of this study is to reveal the relationship between growth conditions of flourish algae and the supply of minerals from GCA. For this purpose, we examine temporal variation of Si ion in the GCA layer. In addition, we also analyzed Si and chlorophyll-a in sediments.
