| Summary: | 碩士 === 國立中興大學 === 環境工程學系 === 89 === Recently, many pollution incidents caused by leakage, spills and disposal of oils from underground storage tanks and pipelines have been found in Taiwan. When these so called “LNAPLs (Light Nonaqueous Phase Liquids)” contamination happens, locating these LNAPLs sources and estimating the volume of pollutants is the first step of the remediation works. Among the technologies of detecting the subsurface conditions of LNAPLs, partitioning interwell tracer test (PITT) is an attractive choice.
This project applies the PITT technique in a series of column tests to detect and estimate the residual saturation of diesel in the sand-packed columns. Due to the fact that the differences between the field conditions and laboratory environments may result in different conclusions, this research investigate the impacts of organic matters of soil and the pH value in groundwater to the PITT results. The results show that PITT can accurately estimate the diesel’s residual saturation under ideal conditions. However, when organic matters introduced in the soil, the adsorption and partition behaviors of the tracers are significantly affected, and higher impacts were observed when more organic matters exist. About the PITT results with pH ranges from 5 to 9 in water, no significant differences were observed.
|
|---|
