堆積泥への灰分(ミネラル)の供給と消費機構  [in Japanese] SUPPLY AND CONSUMPTION MECHANSIM OF ASH (MINERAL) TO DEPOSITED MUD  [in Japanese]

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Abstract

広島市中心部を流れる京橋川河岸に堆積した有機泥に起因する環境汚濁を改善するため2013年に約1.5kmに渡って石炭灰造粒物(GCA)が散布された.造粒物層の上層には藻類が繁茂し生態系の改善が進んでいる.石炭灰を主原料とするGCAの主成分はSiO<sub>2</sub>,CaO等の酸化物である.石炭灰造粒物の特性として非晶質であるがガラス(SiO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub>系)を主体にSiO<sub>2</sub>が含有されており,ミネラルであるCa,Siイオンの溶出能力が高い.本研究の目的はGCAから溶出するミネラルと藻類繁茂の関係を明らかすることにある.藻類繁茂のメカニズムを明らかとするため,Siに注目し感潮域干潟でのSiの時間的変化や堆積泥中に含まれるSiやクロロフィル-aを分析し検討した.

 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 SiO<sub>2</sub> 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 SiO<sub>2</sub> 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.

Journal

  • Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 72(2), I_658-I_663, 2016

    Japan Society of Civil Engineers

Codes

  • NII Article ID (NAID)
    130005263322
  • Text Lang
    JPN
  • NDL Article ID
    027812754
  • NDL Call No.
    YH267-236
  • Data Source
    NDL  J-STAGE 
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