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

机译:裂缝水上汽油成分的生物降解:田间研究

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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:裂隙介质地下水污染物的自然衰减是很难证明,因为很难保证一个下坡监测点位于受影响地下水的流动路径。在威斯康星州的一个田间现场,从泄漏的地下储罐释放汽油释放到达水位,在地下水中观察到裂缝的白云岩储水中的溶解汽油成分。水管中的地下水流动通过迁移到源区的漫反射区约400英尺的散射骨折区域来实现。溶解的汽油成分在浅层地下水中持续存在成千上万的#μm#g / L的总浓度,直到达到裂缝区。在地下水进入骨折区后,芳烃碳氢化合物衰减两种或更多个数量级,直到达到骨折区。地下水进入骨折区后,芳烃碳氢化合物被两种或更多个数量级,单次或更多数量级,单次#mu#g / l浓度,而MTBE仅衰减30

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