Department of Environmental Engineering, Helmholtz Centre for Environmental Research - UFZ, Permoserstrasse 15, 04318 Leipzig, Germany.
Environ Sci Technol. 2010 Dec 15;44(24):9502-8. doi: 10.1021/es1027772. Epub 2010 Nov 24.
Thermal desorption of a wide spectrum of organic contaminants, initiated by radio frequency (RF) heating, was studied at laboratory and pilot-plant scales for an artificially contaminated soil and for an originally contaminated soil from an industrial site. Up to 100 °C, moderate desorption rates were observed for light aromatics such as toluene, chlorobenzene, and ethylbenzene. Desorption of the less volatile contaminants was greatly enhanced above 100 °C, when fast evaporation of soil-water produced steam for hydrocarbon stripping (steam-distillation, desorption rates increased by more than 1 order of magnitude). For hydrocarbons with low water solubility (e.g., aliphatic hydrocarbons), the temperature increase above 100 °C after desiccation of soil again led to a significant increase of the removal rates, thus showing the impact of hydrocarbon partial pressure. RF heating was shown to be an appropriate option for thermally enhanced soil vapor extraction, leading to efficient cleaning of contaminated soils.
宽范围有机污染物的热解吸研究，由射频（RF）加热引发，在实验室和中试规模上对人工污染土壤和工业场地原始污染土壤进行了研究。在 100°C 以下，甲苯、氯苯和乙苯等轻芳烃的解吸速率适中。当土壤水分快速蒸发产生蒸汽进行烃类脱附（蒸汽蒸馏）时，在 100°C 以上，挥发性较低的污染物的解吸大大增强，解吸速率增加了一个数量级以上。对于低水溶性的烃类（如脂肪烃），在土壤干燥后温度升高到 100°C 以上，再次导致去除率显著增加，从而显示出烃分压的影响。RF 加热被证明是热增强土壤蒸气提取的一种合适选择，可有效清洁污染土壤。
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