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首页> 外文期刊>Environmental Science & Technology >Remediation of Polycyclic Aromatic Hydrocarbon Compounds in Groundwater Using Poplar Trees
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Remediation of Polycyclic Aromatic Hydrocarbon Compounds in Groundwater Using Poplar Trees

机译：杨树修复地下水中的多环芳烃化合物

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A seven-year study was conducted to assess the effectiveness of hybrid poplar trees to remediate polycyclic aromatic hydrocarbon (PAH) compounds in soil and groundwater at a creosote-contaminated site. A reduction in the areal extent of the PAH plume was observed in the upper half of the 2-m-thick saturated zone, and PAH concentration levels in the groundwater declined throughout the plume. PAH concentrations began to decline during the period between the third and fourth growing seasons, which coincided with the propagation of the tree roots to the water table region. Remediation was limited to naphthalene and several three-ring PAHs (acenaphthylene and acenaphthene). PAH concentrations in soil and aquifer sediment samples also declined overtime; however, levels of four-ring PAHs persisted at the lower depths during the study period. The naphthalene to total PAH concentration ratio in the most contaminated groundwater decreased from >0.90 at the beginning of the second growing season to approximately 0.70 at the end the study. Remediation in the lower region of the saturated zone was limited by the presence of a 0.3-m-thick layer of creosote present as a dense nonaqueous phase liquid (DNAPL). The nearly steady-state condition of the PAH concentrations observed during the last three years of the study suggests that the effectiveness of the phytoremediation system is limited by the rate of PAH dissolution from the DNAPL source.
机译：进行了为期七年的研究，以评估杂种杨树在受杂酚油污染的土壤中修复土壤和地下水中多环芳烃（PAH）化合物的有效性。在2米厚的饱和区的上半部，PAH羽流的面积减小了，整个羽流中地下水中PAH的浓度都下降了。 PAH浓度在第三个生长季节和第四个生长季节之间开始下降，这与树根向地下水位区域的传播相吻合。修复仅限于萘和几种三环PAH（ac和and）。随着时间的推移，土壤和含水层沉积物中的PAH浓度也下降了。然而，在研究期间，四环PAHs的水平在较低的深度持续存在。在污染最严重的地下水中，萘与总PAH的浓度比从第二个生长季节开始时的> 0.90降至研究结束时的约0.70。饱和区下部的修复受到稠密非水相液体（DNAPL）中存在的0.3 m厚的杂酚油层的限制。在最近三年的研究中观察到的PAH浓度接近稳态，这表明植物修复系统的有效性受到DNAPL来源的PAH溶解速率的限制。

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