Microbial induced desaturation technique for ground applying denitrification

• Project/Area Number: 17H05038
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Single-year Grants
• Research Field: Rural environmental engineering/Planning
• Research Institution: Kyushu University
• Principal Investigator: nakano akiko 九州大学, 農学研究院, 助教 (10631286)
• Project Period (FY): 2017-04-01 – 2021-03-31
• Project Status: Completed (Fiscal Year 2020)
• Budget Amount: ¥25,480,000 (Direct Cost: ¥19,600,000、Indirect Cost: ¥5,880,000); Fiscal Year 2019: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000); Fiscal Year 2018: ¥8,060,000 (Direct Cost: ¥6,200,000、Indirect Cost: ¥1,860,000); Fiscal Year 2017: ¥14,950,000 (Direct Cost: ¥11,500,000、Indirect Cost: ¥3,450,000)
• Keywords: 地盤改良 / 微生物 / 脱窒 / バイオガス / 不飽和化 / 炭酸カルシウム / バイオミネラリゼーション / 固化 / バイオグラウト / 不飽和 / 砂地盤 / 微生物活性 / 液状化対策 / 砂 / 地盤工学 / 環境技術

Outline of Final Research Achievements

This study aimed to establish the desaturation process by microbial denitrification in sand sediment. The process is expected to control the water saturation of sand sediment and also improve the friction force between soil particles with a simple procedure by producing biogas and biomineral through denitrification. A trace amount of soil water can be reduced from 100% to 85-95% in the water saturation ratio by this method. The soil engineering properties of sand samples like pore diameter distribution and water retention ability were altered after the microbial reaction. The sand surface characteristics possibly give an effect on the microbial reaction and the following biomineral production.

Academic Significance and Societal Importance of the Research Achievements

本研究課題は，地盤環境工学分において，生物化学的要素を取り入れた新たな地盤改良技術の開発を目指した挑戦的な研究である．
本研究では，微生物の脱窒による砂の不飽和化プロセスを確立し，あらゆる地盤環境条件での適用が可能であることを確認した．従来の不飽和化を目的とした改良工法では，飽和度の微量なコントロールが困難であったが，本手法では飽和状態から90－85％程度へ飽和度を低下させることが可能であり，反応適用時の砂の最終飽和度も予測可能とした．本研究で確立した不飽和化手法は，特に地盤の液状化に対する抵抗性を向上させる有効な手段として期待できる．

Research Products

• [Int'l Joint Research] Arizona State University(米国)
• [Int'l Joint Research] Arizona State University(米国)
• [Int'l Joint Research] Thuyloi University(ベトナム)
• [Int'l Joint Research] Arizona State University(米国)
• [Int'l Joint Research] Thuyloi University(ベトナム)
• [Int'l Joint Research] アリゾナ州立大学(米国)
• [Journal Article] Microbe-induced desaturation of sand using pore pressure development by way of denitrification (2018)
  • Author(s): Nakano A.
  • Journal Title: Geotechnique Letters Volume: 8 Issue: 1 Pages: 1-16
  • DOI: 10.1680/jgele.17.00039
  • Peer Reviewed / Open Access
• [Presentation] バイオガス生成による砂の飽和度変化とその予測 (2019)
  • Author(s): 中野晶子,佐藤宏樹
  • Organizer: 第54回地盤工学研究発表会
• [Presentation] 各種液状化対策工における改良地盤と微生物固化処理土の液状化抵抗の比較 (2019)
  • Author(s): 中澤博志,鈴木亮彦,中野晶子,畠俊郎
  • Organizer: 第54回地盤工学研究発表会
• [Presentation] Pore structure alteration of sands by microbially induced carbonate precipitation via denitrification (2018)
  • Author(s): Akiko Nakano,Tomoya Kakita
  • Organizer: InterPore2018
  • Int'l Joint Research
• [Presentation] 脱窒反応を利用した砂粒子表面での炭酸カルシウム結晶析出と間隙径の変化 (2018)
  • Author(s): 中野晶子, 柿田智哉
  • Organizer: 第53回地盤工学研究発表会
• [Presentation] USING DENITRIFICATION TO MICROBIALLY REDUCE WATER SATURATION FOR SOIL IMPROVEMENT (2018)
  • Author(s): Vinh Pham, Akiko Nakano, L.A. van Paassen, W.R.L. van der Star
  • Organizer: INTERNATIONAL SYMPOSIUM ON LOWLAND TECHNOLOGY ISLT 2018
  • Int'l Joint Research
• [Presentation] Pore structure alteration of sands by microbially induced carbonate precipitation via denitrification (2018)
  • Author(s): Akiko Nakano, Tomoya Kakita
  • Organizer: InterPore2018
  • Int'l Joint Research
• [Presentation] 脱窒反応を利用した砂粒子表面での炭酸カルシウム結晶析出と間隙径の変化 (2018)
  • Author(s): 中野晶子，柿田智哉
  • Organizer: 第53回地盤工学研究発表会
• [Presentation] USING DENITRIFICATION TO MICROBIALLY REDUCE WATER SATURATION FOR SOIL IMPROVEMENT (2018)
  • Author(s): A. Nakano, Vinh P. Pham , L.A. van Paassen
  • Organizer: International Symposium on Lowland Technology
  • Int'l Joint Research
• [Presentation] 脱窒反応による土中のバイオガス生成を用いた不飽和化技術の研究開発 (2017)
  • Author(s): 中野 晶子
  • Organizer: 第52回地盤工学研究発表会
• [Presentation] 尿素分解菌と脱窒菌を組合せた微生物固化についての検討 (2017)
  • Author(s): 松林 達也, 畠 俊郎, 中野 晶子
  • Organizer: 第52回地盤工学研究発表会