Study on Extracellular Polymeric Substances Secreted by Benthic Algae in Ariake Sea

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  • Harada Hiroyuki
    Chemistry and Applied Chemistry, Faculty of Science and Engineering, Saga University
  • Amano Yoshimasa
    Applied Chemistry and Biotechnology, Chiba University
  • Shiki Masahiko
    Chemistry and Applied Chemistry, Faculty of Science and Engineering, Saga University
  • Yoshino Kenji
    Chemistry and Applied Chemistry, Faculty of Science and Engineering, Saga University
  • Yamamoto Koichi
    Department of Civil and Environmental Engineering, Faculty of Engineering, Yamaguchi University
  • Yokoyama Katuhide
    Department of Civil & Environmental Engineering, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University
  • Kawakita Hidetaka
    Chemistry and Applied Chemistry, Faculty of Science and Engineering, Saga University
  • Ohto Keisuke
    Chemistry and Applied Chemistry, Faculty of Science and Engineering, Saga University

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Other Title
  • 有明海底泥から抽出した付着藻類起因多糖含有溶液の特性に関する研究
  • アリアケ カイテイデイ カラ チュウシュツ シタ フチャク ソウルイ キイン タトウ ガンユウ ヨウエキ ノ トクセイ ニ カンスル ケンキュウ

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Abstract

The influence of extracellular polymeric substances originated from benthic algae on particle aggregation and sedimentary stabilization in the Ariake Sea was investigated through laboratory experiment. Extracellar polymeric substances in the lyophilized sediment were isolated as a colloidal carbohydrate fraction. The influence of the polymeric substances on particle aggregation and sedimentary stabilization was experimentally examined through rheological measurement. The rheological properties of polymeric subustances solution and sediment slurry with polymeric subistances in the presence of calcium ions were evaluated using a shear rate changeable rehometer. The aqueous solution of polymeric substances solution behaved as Bingham fluids, and the shear stress increase with elapsed time, probably due to hydration. The sea sediment slurry with polymeric substances behaved as a non-Bingham fluid. The stress–strain hysteresis loop width predicts the interaction of sediment and polymeric substances. Polymeric substances enhance sediment stabilization, and the effect is greatly improve by calcium ions.

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