石炭灰造粒物を用いた沿岸底質環境改善材開発のための基礎的研究: 栄養塩溶出試験およびSkeletonema costatumの増殖試験

摘要

The Characterization of cement-granulated coal ash was carried out for the purpose of remediation of organically rich sediment by controlling the nutrient balance of ecosystems. The granulated coal ash used in this study is composed of SiO_2, CO_3, Al_2O_3, CaO with quartz and aluminum silicate as the main phases. Moderate dissolutions of phosphate, silicate and calcium were observed. This may be useful for the neutralization of the acidified sediment and effective for controlling the balance of nutrients in coastal seas. Although the growth of the diatom S. costatum was inhibited under the batch culture condition owing to pH increase, such a pH increase would not occur under natural conditions because of magnesium precipitates and carbonate equilibrium.%富栄養化対策として，陸域からのCOD，リン，窒素負荷の削減により海域の赤潮発生抑制には一定の成果をもたらした。第6次総量規制において瀬戸内海の化学的酸素要求量，窒素含有量及びリン含有量に係る総量削減基本方針によると大阪湾を除く瀬戸内海において，CODについては海域水質の悪化を防ぐこと，これに対して，リンおよび窒素については海域水質の維持を図ることを目途として新たな総量削減基本方針が策定された。