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Remediation mechanism of contaminated ground by volatile organic compaunds using X-ray CT method

X射线CT法对挥发性有机物污染地面的修复机理

基本信息

批准号：
24760382
负责人：
MUKUNOKI Toshifumi
金额：
$ 2.41万
依托单位：
Kumamoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Young Scientists (B)
财政年份：
2012
资助国家：
日本
起止时间：
2012-04-01 至 2014-03-31
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-24760382/
关键词：
X線CT画像解析地盤浄化油汚染国際情報交換

项目摘要

The objective of this study is to understand the remediation mechanism of LNAPL contamination by heat fluids such as air and water. In this paper, developed a newly hot air injection device for micro fo-cused X-ray Computed Tomography(MXCT) scanner, and conducted the hot air injection experiment. And, it was evaluated and observed the remediation phenomenon by obtained by the Image analysis. Meanwhile, analyzed about heat transfer in the pore scale due to hot water injection by using the finite element method(FEM). From result of experiment and Image Analysis, Fluidity of LNAPL is increased by hot air injection, but it is trapped by capillary pressure, therefore flow phenomenon is prevented. How-ever, volatilization efficiency of LNAPL was increased by hot air injection, and then remediation was proceeded. Result of Analysis indicates that Heat was spread by transmitting the soil particles in pore scale.

本研究的目的是了解空气和水等热流体对LNAPL污染的修复机制。本文研制了一种用于微聚焦x射线计算机断层扫描（MXCT）的新型热空气喷射装置，并进行了热空气喷射实验。通过图像分析，对修复效果进行评价和观察。同时，采用有限元法分析了热水注入对孔隙尺度传热的影响。实验结果和图像分析表明，热空气注入增加了LNAPL的流动性，但被毛细压力截留，从而阻止了流动现象的发生。注入热空气可提高LNAPL的挥发效率，并对其进行修复。分析结果表明，热在孔隙尺度上是通过土壤颗粒的传递来传播的。