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Design of an MTBE Remediation Technology Evaluation

机译：MTBE修复技术评估的设计

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This study examines the intrinsic variability of dissolved methyl tert-butyl ether (MTBE) concentrations in ground water during the course of a pilot-scale bioremedial technology trial in Port Hueneme, California. A pretrial natural gradient tracer experiment using bromide was conducted in an anaerobic test section of the aquifer to characterize hydrogeology. The results showed the presence of a complex velocity field in terms of-vertical stratification and preferential flowpaths. The hydraulic conductivity at the test area varied by > 2 orders of magnitude, and the effects of vertical stratification were made apparent by the tracers' detection pattern, which was predominately higher in the lower part of the aquifer. Since historically the lower portion of the aquifer significantly influenced MTBE transport, it was emphasized by increasing the sampling frequency for MTBE and tracers during the pilot test that involved the intermittent addition of oxygen and propane into the aquifer. A second tracer experiment using bromide and deuterated MTBE (~2H_(12)-MTBE) was conducted at the onset of the technology trial and after the aquifer was made aerobic. The continuous metering of the tracer solutions into the test area was maintained for 300 d. The results showed that ~2H_(12)-MTBE behaved as a conservative tracer since (1) its concentrations increased throughout the study approaching its designed injected level and (2) the pattern of its detection resembled that of bromide. On the other hand, ~2H_(12)-MTBE, which was purposefully introduced into the aquifer, behaved differently from that of the existing dissolved MTBE plume that emanated from a non-aqueous phase liquid (NAPL) source over a decade ago, thereby undergoing years of diffusion. The data imply that a detailed understanding of the complexity of the flow field was not possible by observing the intrinsic MTBE data alone.
机译：这项研究检查了加利福尼亚州韦尼姆港的中试规模的生物修复技术试验过程中，地下水中溶解的甲基叔丁基醚（MTBE）浓度的内在变异性。在含水层的厌氧试验区进行了使用溴化物的预审自然梯度示踪剂实验，以表征水文地质学。结果表明在垂直分层和优先流动路径方面存在复杂的速度场。测试区域的水力传导率变化大于2个数量级，并且通过示踪剂的检测模式可以明显看出垂直分层的影响，该模式在含水层的下部尤为明显。由于从历史上看，含水层的下部会显着影响MTBE的传输，因此在试点试验中增加了MTBE和示踪剂的采样频率，从而将氧气和丙烷间歇地添加到含水层中，从而强调了这一点。在技​​术试验开始时以及将含水层变成好氧层之后，进行了使用溴化物和氘代MTBE（〜2H_（12）-MTBE）的第二次示踪剂实验。将示踪剂溶液连续计量加入测试区域的时间为300 d。结果表明〜2H_（12）-MTBE表现为保守的示踪剂，因为（1）在整个研究过程中其浓度增加，接近其设计的注射水平；（2）其检测模式与溴化物相似。另一方面，故意引入含水层中的〜2H_（12）-MTBE的行为与十年前从非水相液体（NAPL）源发出的现有溶解MTBE羽的行为不同。经历了多年的扩散。数据表明，仅通过观察固有的MTBE数据就不可能详细了解流场的复杂性。

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