油で汚染された国頭マージ土壌のバイオレメディエーションに用いる浄化促進材の基礎的研究  [in Japanese] Basic Study on Purification Effect and Influence Factors of Bioremediation with Purification Promotion Materials for Petroleum-contaminated Kunigami-maji Soil  [in Japanese]

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Abstract

<p>沖縄本島北部に分布する国頭マージ土壌を用いて油汚染土壌の室内浄化試験を実施し, 島内で産出される琉球石灰岩砕・粒子を含めた浄化促進材の添加を通じて, バイオレメディエーションによる油分浄化特性と影響要因について考察した.軽油模擬汚染土壌に琉球石灰岩を5%以上添加することにより, 土壌含水比が5~20%の範囲で油分の浄化速度(Total Petroleum Hydrocarbons(TPH)浄化速度)を向上させるとともに, 貝殻片や花崗岩砕等を用いた浄化促進材との比較検証の結果, 琉球石灰岩砕が最もTPH浄化速度を高めることを明らかにした.琉球石灰岩砕・粒子は, 油分分解菌の代謝活動に必要となる通気性とその棲息域を確保する細孔を多く有しており, 国頭マージ土壌のpHを酸性域から中性域に中和する効果もあることから, 土壌中の油分分解菌の活性化によりTPH浄化速度が向上したものと推察される.</p>

<p>Biostimulation of a petroleum-contaminated soil is a remediation technique that stimulates indigenous microorganisms capable of degrading pollutants with adding of phosphorus, nitrogen compounds, and oxygen. This study is conducted to evaluate the purification effect and influence factors of bioremediation with purification promotion materials including Ryukyu limestone for petroleum-contaminated Kunigami-maji soil, in the northern part of Okinawa Island. Soil remediation tests in our laboratory were conducted to purification characteristics and influential factors for bioremediation. As for the Total Petroleum Hydrocarbons (TPH) removal action, it was confirmed to evaluate purification speed using a primary equation quantitatively. It was confirmed that oil purification speed (removal rate constants of THP) could be improved in the range of 5-20% of water-contents in the soil by adding Ryukyu limestone in contaminated soil more than 5%. It was also clarified that Ryukyu limestone powder (125µm or less) showed the highest TPH purification effect among addition materials of shell pieces and building stones. It was considered that the breathability to be necessary for the metabolism activities of the solution microbe for petroleum-contaminated Kunigami-maji soil, the porous nature of the Ryukyu limestone and the surface was maintained as habitation area of oil solution bacteria. It was suggested that TPH removal performance improved as a result that purification speed was promoted by the activation of the solution microbe, increase in slight biomass, neutralization of the soil.</p>

Journal

  • Transactions of The Japanese Society of Irrigation, Drainage and Rural Engineering

    Transactions of The Japanese Society of Irrigation, Drainage and Rural Engineering 87(1), I_9-I_15, 2019

    The Japanese Society of Irrigation, Drainage and Rural Engineering

Codes

  • NII Article ID (NAID)
    130007586664
  • Text Lang
    JPN
  • ISSN
    1882-2789
  • Data Source
    J-STAGE 
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