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首页> 外文期刊>Journal of industrial and engineering chemistry >Remediation of PAHs contaminated soil by extraction using subcritical water
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Remediation of PAHs contaminated soil by extraction using subcritical water

机译：亚临界水萃取修复多环芳烃污染土壤

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摘要

The remediation of polycyclic aromatic hydrocarbons (PAHs) contaminated soil has been investigated by extraction using continuous flowing subcritical water. Water temperature ranging from 100 to 300 °C, extraction time ranging from 15 to 60 min, and flow rate ranging from 0.5 to 2.0 mL/min were investigated to determine their effect on the removal efficiencies of target PAHs. More than 95% extraction of the phenanthrene, fluoranthene, and pyrene from contaminated soil was observed at 300 °C for 30 min and 250 °C for 60 min at a constant pressure of 100 bar. However, naphthalene was almost completely extracted only at a comparatively low temperature of 150 °C and extraction time of up to 30 min and a pressure of 100 bar. The subcritical water flow rate of 0.5 mL/min was recommendable in this study. The extraction efficiency of PAHs was extremely dependent on water temperature, since the dielectric constant (polarity) of water could be dramatically lowered by raising the water temperature. These results suggest that soils contaminated by persistent organic chemicals such as PAHs can be easily remediated by extraction using pure water under a high temperature without any modification.
机译：通过使用连续流动的亚临界水进行萃取，研究了多环芳烃（PAHs）污染土壤的修复方法。研究了水温从100到300°C，提取时间从15到60分钟，流速从0.5到2.0 mL / min的过程，以确定它们对目标PAHs去除效率的影响。在100 bar的恒定压力下，在300°C下30分钟和250°C下60分钟观察到从污染土壤中菲，荧蒽和pyr的萃取率超过95％。但是，萘仅在相对较低的150°C和长达30分钟的提取时间以及100 bar的压力下才能完全提取出来。在这项研究中建议0.5 mL / min的亚临界水流速。多环芳烃的萃取效率非常依赖于水温，因为通过提高水温可以大大降低水的介电常数（极性）。这些结果表明，可以通过在高温下使用纯水进行萃取而无需进行任何修饰，而容易地修复被持久性有机化学物质（如PAHs）污染的土壤。

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