堆積泥を燃料とする微生物燃料電池における石炭灰造粒物の有効利用  [in Japanese] EFFECTIVE USE OF GRANULATED COAL ASH IN SEDIMENT MICROBIAL FUEL CELLS  [in Japanese]

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Abstract

堆積泥を燃料とする微生物燃料電池(Sediment microbial fuel cell: SMFC)は有機物分解を促進させるが,電極への電子伝達速度が低く,堆積泥の酸性化等の問題が残されている.本研究ではSMFCにおける電子伝達速度の向上,酸性化の緩和,および栄養塩類の固定に対する石炭灰造粒物(Granulated Coal Ash: GCA)の効果を室内実験により明らかにする.下水放流を受けた海域から堆積泥を採取し,GCAと混合した堆積泥からSMFCで電子回収を行った.実験終了後,各ケースの間隙水質,上層水,および堆積泥の性状を比較し,GCAの効果を検討した.この結果,GCAの混合により電極への電子伝達速度が向上されること,電子回収に伴うpHの低下を防ぐこと,および有機物分解に伴う栄養塩類,特にPO<sub>4</sub>を高い効率で固定できることがわかった.さらに,電子回収はGCAの効果を高めることが明らかになった.

 Sediment microbial fuel cell (SMFC) can improve decomposition of organic matter in sediments; however, there are some problems such as low rate of electron transfer and decrease in pH of sediments. In this study, we aim to understand effects of granulated coal ash (GCA) on increasing electron transfer rate, increasing pH, and fixing nutrient salts in SMFC through laboratory experiments. Sediment was collected from a coastal region that affected by wastewater discharge, and used as fuel in SMFC. At the end of experiment, we analyzed and compare pore water and overlaying water qualities, and sediment properties of each case. As a result, mixing GCA with sediment increased electron transfer rate, protecting the decrease of pH by electron recovery, and fixing the nutrient salts released during decomposition of organic matter, specifically fixing PO<sub>4</sub>. Furthermore, SMFC can make GCA to be more effective in fixing the nutrient salts, and decomposition of organic matter within SMFC is enhanced after mixing GCA.

Journal

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

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 72(2), I_1327-I_1332, 2016

    Japan Society of Civil Engineers

Codes

  • NII Article ID (NAID)
    130005282269
  • Text Lang
    JPN
  • ISSN
    1884-2399
  • NDL Article ID
    027812713
  • NDL Call No.
    YH267-236
  • Data Source
    NDL  J-STAGE 
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