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在多孔介质中形成微生物气泡
Daehyun Kim1,2, Hojeong Kang1, Leon A van Paassen3
1School of Civil and Environmental Engineering, Yonsei University, Seoul, Republic of Korea.
Heliyon
|July 8, 2024
概括
微生物产生的气泡可以通过减少和来改善土壤,但它们的形成机制需要进一步研究. 这项研究使用微流体学可视化了这些过程,为地质技术应用提供了洞察力.
科学领域:
- 地质技术工程 地质技术工程
- 环境微生物学 环境微生物学
- 流体动力学 流体动力学
背景情况:
- 来自微生物活动的地下气泡 (N2) 被探索用于改善土壤以减轻地震引起的土壤液化.
- 控制地下N2气泡形成的精确机制及其对土壤性质的影响仍然不完全理解.
研究的目的:
- 使用透明的微流体装置,对微生物诱导的N2气泡形成过程进行视觉描述.
- 将N2气体形成与非生物二氧化碳 (CO2) 气体形成进行比较,以了解对比的机制.
主要方法:
- 利用微流体装置模拟和可视化由酸盐减少细菌产生的生物N2气泡.
- 观察到气泡核形成,通过孔隙通道扩张和气囊形成.
- 在不同解压速率下,对CO2气泡形成进行了比较实验.
主要成果:
- 从有限的核化地点形成的N2气泡,扩展到相互连接的口袋中,并随着时间的推移减少了水和度.
- 观察到沸事件,气从装置中排出,其残留和率约为73%.
- 二氧化碳泡形成显示出不同的机制:快速解压导致均核和41%的残留和,而较慢的解压导致35%的残留和.
结论:
- 微流体设备是可视化地下气体形成机制的有效工具.
- 该研究提供了N2和CO2气泡动态的见解,有助于优化和土壤中的地质技术应用.
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