2023 Fiscal Year Final Research Report
Study on Remediation of Oil Contaminated Ground by Ultrasonic Vibration and Its Mechanical Properties
| Project/Area Number |
21K04257
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 22030:Geotechnical engineering-related
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| Research Institution | Kumamoto University |
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Principal Investigator |
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Keywords | 油汚染地盤 / 超音波 / 乳化 / 温度 / 粘性低下 / X線CT画像解析 |
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| Outline of Final Research Achievements |
In this study, experiments were conducted to measure the residual state of contaminated fluid and the spatial distribution of temperature increase due to ultrasonic irradiation in oil-contaminated soil using liquid paraffin as the oil. The aim was to elucidate the ultrasound-based remediation mechanism. The findings of this study are as follows: (1) The effect of ultrasonic vibration is stronger on the geomaterials closer to the transducer, allowing continuous injection of pore water to produce continuous emulsification. (2) The ultrasonic energy causes a higher temperature in the area of influence, with a temperature increase of nearly 70°C expected around the transducer, thus reducing the viscosity of the immobile oil. The results also suggest that continuous injection of pore water is essential in addition to ultrasonic irradiation.
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| Free Research Field |
環境地盤工学
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| Academic Significance and Societal Importance of the Research Achievements |
本研究は，油汚染地盤を対象に超音波を照射し，間隙水と汚染油の乳化を発生させて浄化する新しい浄化手法の提案を目指した．超音波を照射させ，いわゆる乳化を促進する環境を整えることで，既存の手法では回収しにくい不動化した残留油を回収できる可能性を示唆することができた．置換法ができようできないような汚染現場において，汚染流体の流動性を高め，回収することは今後さらに重要な課題になる．本研究は基礎研究であり，本事業期間内に社会実装できる成果は得られてはいないが，地盤材料内部で超音波がもたらす諸現象（乳化、温度上昇、地盤の密実化）による浄化機構を示すことができたことは，学術的にも意義があると考える．
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