還元有機泥が堆積した海域の底質改善に用いられる石炭灰造粒物の生物親和性評価  [in Japanese] Evaluation of biological affinity of granulated coal ash utilized to covering material in coastal sediments and tidal flats which sludge deposited  [in Japanese]

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Abstract

広島湾沿岸域では,還元有機泥が底質に堆積し生物生息環境の悪化を招いている干潟,浅場がある.この底質改善に石炭灰(FA)を造粒・固化した海砂代替材(石炭灰造粒物)が覆砂材として活用され底質改善効果が確認されているが,その材料特性による生物親和性(微生物および珪藻類の選好的付着性状,二枚貝等底生生物の選好性状)については十分に明らかにされていない.本研究は,石炭灰造粒物を還元有機泥が堆積した海域底質の覆砂材として活用する場合の生物親和性について,室内および現場実験により明らかにすることを目的とした.石炭灰造粒物と対照基質(在来底質,自然石,砂およびセメント固化体)の物理化学特性,溶存態イオン溶出特性,微生物の付着,珪藻類の付着および二枚貝の行動選好性に関する実験,調査により生物親和性を評価した.

 Hiroshima coastal area is an enclosed bay in the western Seto Sea Inland. There are organic matter enriched coastal sediments and tidal flats due to the outfall of the domestic wastewater in the coastal area. Recently, sludge purification of organic matter enriched sediments using granulated coal ash (GCA) have been used in Hiroshima coastal areas. It has been proved that GCA can absorb the compounds of phosphorus, nitrogen and sulfer. However, the material properties of GCA for biological affinity have not been fully clarified. The purpose of this study is to evaluate of the biological affinity of GCA utilized to covering material. Laboratory experiments were carried out to evaluate the physical and chemical properties (e.g. surface area, pore ratio, and elation characteristics of ion) of GCA (covering material) and control materials (e.g. cement solidification, and natural stone) for biological affinity. And, field experiments were also carried out to estimate the adhesion of micro-organism, the exuberance of diatoms, and the behavioral preference of bivalve in GCA and control materials (e.g. conventional sediments, natural stone, sand). From our findings, it can be concluded that GCA can be used as a covering material to improve biological environment in organic matter enriched coastal sediments.

Journal

  • Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 71(2), I_1459-I_1464, 2015

    Japan Society of Civil Engineers

Codes

  • NII Article ID (NAID)
    130005109376
  • Text Lang
    JPN
  • ISSN
    1884-2399
  • NDL Article ID
    027097418
  • NDL Call No.
    YH267-236
  • Data Source
    NDL  J-STAGE 
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