| Автор | She, Yuanyin |
| Автор | Sleep, Brent |
| Автор | Mackay, Donald |
| Дата выпуска | 1995 |
| dc.description | AbstractA relatively simple fugacity‐based model is developed for predicting the effectiveness of soil vapor extraction (SVE), an in situ soil remediation technique used for removing volatile organic chemicals from unsaturated soils. The model accounts for the natural processes of volatilization, degradation, and leaching, as well as gas‐phase advection due to SVE. Model predictions are compared with published data for a field‐scale SVE operation. An exponentially declining sweep efficiency for SVE is introduced to improve the fit between simulated and measured soil extraction gas concentrations. The model permits the magnitudes of the various processes affecting the fate and transport of 1,1,1‐trichloroethane (TCA) and perchloroethylene (PCE) in soils to be evaluated. Without SVE, the dominant removal process is biodegradation, but the rate of degradation is low, requiring more than 9 years for soil gas concentrations from a spill of about 13 kg of TCA to be reduced to a concentration of 0. 001 μg/l. The removal time may be reduced to only about 2 years if SVE is used. Moreover, substantially less chemical leaches into the underlying groundwater, greatly reducing the potential extent of ground water contamination. |
| Формат | application.pdf |
| Издатель | Taylor & Francis Group |
| Копирайт | Copyright Taylor and Francis Group, LLC |
| Тема | soil contamination |
| Тема | fate of organic chemicals |
| Тема | environmental pathways. |
| Название | A fugacity model for soil vapor extraction |
| Тип | research-article |
| DOI | 10.1080/15320389509383496 |
| Print ISSN | 1058-8337 |
| Журнал | Journal of Soil Contamination |
| Том | 4 |
| Первая страница | 227 |
| Последняя страница | 242 |
| Аффилиация | She, Yuanyin; Departments of Civil Engineering, University of Toronto |
| Аффилиация | Sleep, Brent; Departments of Civil Engineering, University of Toronto |
| Аффилиация | Mackay, Donald; Departments of Chemical Engineering and Applied Chemistry, University of Toronto |
| Выпуск | 3 |
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