Transport behavior of persulfate in porous media
| Autor: | Yi-Rou Wu, 吳伊柔 |
|---|---|
| Rok vydání: | 2011 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 99 In situ chemical oxidation (ISCO) mainly by the injection of a chemical reagent into the subsurface environment to reduce contaminant mass by oxidation processes. Persulfate as an emerging oxidant for soil and groundwater contaminants, and it has several advantages. First, persulfate is more stable than hydrogen peroxide and thus able to transport greater distances in the sub-surface. Second, persulfate has less affinity and is thus more efficient in high organic soils. Few studies to date have investigated simulation for the transport of persulfate in porous media. Therefore, the objective of this study was to investigate the transport mechanism of persulfate in the aquifer through one-dimensional system. The results of this research demonstrate that the one-dimensional Convective-Dispersive-Degradative equation can appropriately describe the process of persulfate in silica sand and sandy soil, and in the same dimension, the dispersivity coefficient for these two soils packed column was the same; persulfate mass loss increases with a slower flow rate. In addition, different permeant water for testing at a constant head presents different flow rate. Mineral water used as a permeant can reduce clay minerals swelling more than distilled water. Furthermore, only little clay soils may cause expansion of the double layer and lead to the generation of preferential flow. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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