土壤气相抽提(SVE)是一种原位物理修复技术,用于去除非饱和土壤(包气带)中的挥发性有机化合物(VOCs)和部分半挥发性有机化合物(SVOCs)。该工艺通过抽气井对土壤施加真空,从而产生…… 压力 梯度促使气相污染物穿过土壤并被收集起来进行处理。

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土壤气相抽提(SVE)是一种原位物理修复技术,用于去除非饱和土壤(包气带)中的挥发性有机化合物(VOCs)和部分半挥发性有机化合物(SVOCs)。该工艺通过抽气井对土壤施加真空,从而产生…… 压力 梯度促使气相污染物穿过土壤并被收集起来进行处理。
土壤气相抽提(SVE)的工作原理是利用挥发作用。通过施加真空,SVE降低土壤孔隙空间的压力,使吸附在土壤颗粒上或溶解在土壤水分中的挥发性污染物进入气相。然后,这些受污染的蒸汽被吸入抽提井。SVE的有效性高度依赖于污染物的挥发性,挥发性由亨利定律常数描述。 蒸汽压以及土壤的渗透性。它在透气性高的沙质或砾质土壤中效果最佳,而在致密、低渗透性的粘土中效果较差。
A typical SVE system consists of extraction wells, vacuum blowers, and an off-gas treatment system. The extracted vapor, laden with contaminants, cannot be directly released into the atmosphere. It must be treated, commonly using methods like granular activated carbon (GAC) adsorption, thermal oxidation, or catalytic oxidation to destroy the VOCs. SVE is often combined with other technologies. For instance, air sparging can be used concurrently to treat saturated zones below the water table. In this combined approach, air is injected into the groundwater, stripping volatile contaminants, which then travel up into the vadose zone where the SVE system captures them. This makes SVE a versatile and relatively low-cost solution for specific types of contamination.
土壤蒸汽提取(SVE)
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