Evaluation of organic contaminants removal in contaminanted soils by surfactant flushing technique.
| Autor: | Heng Tien, 田恒 |
|---|---|
| Rok vydání: | 2001 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 89 Soil and groundwater contamination is an important task in dealing with 170 illegal dumping sites and many industrial zones in Taiwan. In-situ flushing has been approved a promising technique in terms of soil and groundwater remediation in the past decade. The objective of this study is to evaluate removal efficiency of organic contaminants in contaminated soil by surfactant flushing technique. Glass column packed with diesel contaminated soil was flushed with six to ten pore volume of surfactants (i.e., sodium dodecyl sulfate (SDS), polyoxyethylene(20)sorbitan monooleate (POE), Makon 10 ethoxylated nonyl phenol) by pumping system. The effluent was collected by the fraction collector, and then analyzed by GC/FID. Sixteen polynuclear aromatic hydrocarbons (PAHs) were selected as target compounds to evaluate removal efficiency by various surfactants. The removal efficiency was obtained by analyzing difference of PAH content of soil before and after flushing and by moment analysis. In evaluation of performance of three surfactants, two concentration levels of surfactant (2100 mg/L and 21000 mg/L) were applied. The result suggested that SDS and Makon 10 have better removal efficiency in six to ten pore volume flushing experiment. Higher concentration level of surfactant did not have significant difference in terms of removal of PAHs. Makon 10 was selected for the cosurfactant flushing experiment by mixing with either ethanol, methanol or acetone. No significant improvement of contaminant removal was observed comparing with single surfactant implication. Various concentration levels of Makon 10 were prepared to test the removal efficiency. The result suggested that when 4000 mg/L of Makon 10 was utilized, it has the best removal efficiency. Flow interruption technique was applied to enhance removal under nonequilibrium condition. This study will assist further understanding of in-situ flushing technique and decision making processes when field practice of soil and groundwater remediation is employed. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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