The Teaching Model of Soil and Groundwater Contamination﹘Using Nonaqueous phase liquid as pollutant
碩士 === 國立高雄師範大學 === 生物科學研究所 === 93 === This soil and groundwater contamination issues have drawn much attention in recent years. The objective of this research is to establish a proper teaching model to demonstrate this type of pollution problem. It is anticipated the teaching model is proper for...
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| Language: | zh-TW |
| Online Access: | http://ndltd.ncl.edu.tw/handle/80810034835683711153 |
| Summary: | 碩士 === 國立高雄師範大學 === 生物科學研究所 === 93 === This soil and groundwater contamination issues have drawn much attention in recent years. The objective of this research is to establish a proper teaching model to demonstrate this type of pollution problem. It is anticipated the teaching model is proper for high school level science education.
A sand box (80 cm×70 cm×1 cm) is designed to represent the subsurface environment. Vegetable oil and honey are used to represent light and dense nonaqueous phase liquid respectively.
Three soils with various particle size (1.000~2.000 mm, 0.250~1.000 mm and less than 0.250 mm) were selected to conduct simulation of NAPL contamination in the sand box. Water represented another controlling factor of NAPL transport in this study.
The results indicated that NAPL transport is faster under lower water saturation. Subsurface environment with higher soil particle size will facilitate NAPL transport. Due to the higher viscosity of DNAPL, LNAPL is moving faster than DNAPL. However, DNAPL can move further down due to its higher density. Water can assist DNAPL transport in the early phase of contamination.
It is very clear to observe the two-dimensional transport of NAPL and if NAPL can pass the water table in this teaching model.
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