El-Gendy Ahmed S, Svingos Sotero, Brice Donald, Garretson Joel H, Schnoor Jerald
Institute of Environment Studies & Research, Ain Shams University, Abbassia, Cairo, Egypt.
Water Environ Res. 2009 May;81(5):486-98. doi: 10.2175/106143008x357011.
A poplar tree-phytoremediation system was installed at former refinery and tank farm sites in Cabin Creek, West Virginia, to cleanup petroleum-contaminated-soils and groundwater. Groundwater and soils in both sites were sampled and analyzed on a regular basis to monitor changes in contaminant concentration since 1999. The concentration of benzene, toluene, ethylbenzene, xylene, and gasoline range organics (GRO) decreased an average of 81%, 90%, 67%, 78%, and 82%, respectively, in the lower soil horizons and 34%, 84%, 12%, 19%, and 59%, respectively, in groundwater. In addition, concentrations of oxygen, methane, and carbon dioxide in soil gas demonstrated that tree roots dewatered soils and allowed penetration of oxygen deep into the soil profile, creating necessary conditions for rhizosphere bioremediation. Although required clean-up time can limit phytoremediation, it has proven to be a cost-effective strategy for site improvement if imminent pathways for human exposure and risk are not an issue.
在西弗吉尼亚州卡宾溪的前炼油厂和油罐场安装了杨树植物修复系统，用于清理受石油污染的土壤和地下水。自1999年以来，定期对两个场地的地下水和土壤进行采样和分析，以监测污染物浓度的变化。在较低的土壤层中，苯、甲苯、乙苯、二甲苯和汽油范围有机物（GRO）的浓度分别平均下降了81%、90%、67%、78%和82%，在地下水中分别下降了34%、84%、12%、19%和59%。此外，土壤气体中的氧气、甲烷和二氧化碳浓度表明，树木根系使土壤脱水，并使氧气深入土壤剖面，为根际生物修复创造了必要条件。尽管所需的清理时间可能会限制植物修复，但如果不存在迫在眉睫的人类接触途径和风险问题，它已被证明是一种具有成本效益的场地改善策略。
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