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Biodegradation of gasoline constituents in a fractured aquitard: a field study

机译：裂化的a鱼中汽油成分的生物降解：一项现场研究

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Natural attenuation of groundwater contaminants in fractured media is difficult to demonstrate because it is difficult to ensure that a downgradient monitoring point is located in the flow path of the affected groundwater. At a field site in Wisconsin, a gasoline release from a leaky underground storage tank reached the water table and dissolved gasoline constituents were observed in groundwater in a fractured dolomite aquitard. Groundwater flow in the aquitard was dominated by migration through a diffuse fracture zone approximately 400 feet downgradient of the source area. The plume of dissolved gasoline constituents persisted in shallow groundwater at total concentrations of thousands of #mu#g/L until the fracture zone was reached. After groundwater entered the fracture zone, the aromatic hydrocarbons were attenuated by two or more orders of magnitude, to single #mu#g/L until the fracture zone was reached. After groundwater entered the fracture zone, the aromatic hydrocarbons were attenuated by two or more orders of magnitude, to single #mu#g/L concentrations, while the MTBE was attenuated by only 30
机译：难以证明裂缝性介质中地下水污染物的自然衰减，因为很难确保在受影响的地下水的流路中有一个下降梯度监测点。在威斯康星州的一个现场，泄漏的地下储油罐中的汽油释放到了地下水位，并且在破裂的白云石阿基塔德的地下水中观察到了溶解的汽油成分。通过在水源区下降约400英尺的弥散性裂缝带中迁移，阿奎塔德地区的地下水流占主导地位。溶解的汽油成分的羽流以总浓度为数千个＃mu＃g / L的浓度持续存在于浅层地下水中，直到达到断裂带为止。地下水进入压裂区后，芳香烃被衰减两个或两个以上数量级，直至达到压裂区＃mu＃g / L。地下水进入压裂带后，芳香烃被衰减两个或两个以上数量级，达到单一的＃mu＃g / L浓度，而MTBE则仅被衰减30个数量级。

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