Field experiments on remediation of organically-enriched sediments accumulated in the ship fairway：　Habitat formation for living organisms by transferring the sediments to shallow euphotic layer and mixing with iron slag

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  • 航路筋に堆積した有機泥の改善に関する試験：有光層への移動と鉄鋼スラグ添加による生物生息場形成
  • コウロキン ニ タイセキ シタ ユウキ デイ ノ カイゼン ニ カンスル シケン : ユウコウソウ エ ノ イドウ ト テッコウ スラグ テンカ ニ ヨル セイブツ セイソクジョウ ケイセイ

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Field experiments were carried out to remediate organically enriched sediments. The sediments were collected from the ship fairway to Amagasaki Port and mixed with ion slag and then placed into hydrated iron slag concrete boxes. The experimental setups were placed in shallow seashore in Amagasaki Port. Sediment pH was increased, and oxidation-reduction potential was also increased by mixing of the slag compared to those at the original site. The concentration of acid-volatile sulfide was significantly decreased by these treatments. Biomass of benthic animals was increased significantly, which was high compared to those in an artificial tidal flat constructed ca. 4 years before our experiments near the experimental site. An acceleration of phosphorus cycle in the sediments was suggested as a cause of remediation by the calculation using a benthic ecosystem model. However, which the transfer sediment to the shallow area and the addition of slag is effective on the remediation was not clear in the present experimental settings.

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