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首页> 外文期刊>Environmental Science & Technology >Chlorinated Ethene Degradation Rate Coefficients Simulated with Intact Sandstone Core Microcosms
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Chlorinated Ethene Degradation Rate Coefficients Simulated with Intact Sandstone Core Microcosms

机译：用完整的砂岩核心微观模拟氯化乙烯降解速率系数

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摘要

Abiotic transformation of trichloroethene (TCE) in fractured porous rock such as sandstone is challenging to characterize and quantify. The objective of this study was to estimate the pseudo first-order abiotic reaction rate coefficients in diffusion-dominated intact core microcosms. The microcosms imitated clean flow through a fracture next to a contaminated rock matrix by exchanging uncontaminated groundwater, unamended or lactate-amended, in a chamber above a TCE-infused sandstone core. Rate coefficients were assessed using a numerical model of the microcosms that were calibrated to monitoring data. Average initial rate coefficients for complete dechlorination of TCE to acetylene, ethene, and ethane were estimated as 0.019 y~(-1) in unamended microcosms and 0.024 y~(-1) in lactate-amended microcosms. Moderately higher values (0.026 y~(-1) for unamended and 0.035 y~(-1) for lactate-amended) were obtained based on ~(13)C enrichment data. Abiotic transformation rate coefficients based on gas formation were decreased in unamended microcosms after ～25 days, to an average of 0.0008 y~(-1). This was presumably due to depletion of reductive capacity (average values of 0.12 ± 0.10 μeeq/g iron and 18 ± 15 μeeq/g extractable iron). Model-derived rate coefficients and reductive capacities for the intact core microcosms aligned well with results from a previous microcosm study using crushed sandstone from the same site.
机译：砂岩如砂岩裂缝多孔岩石中三氯乙烯（TCE）的非乙烯转化是具有挑战性的，表征和量化。本研究的目的是估算扩散主导的完整核心微观芯片中的伪首级非生物反应速率系数。通过交换未污染的地下水，未加工或乳酸修正，在TCE注入的砂岩核心之上的腔室内，通过污染的地下水旁边的裂缝模仿清洁流动。使用校准数据的微观微观的数值模型来评估速率系数。用于完全脱氯至乙炔，乙烯和乙烷的平均初始速率系数估计为0.019y〜（-1）在乳酸乳酸乳酸乳酸乳酸乳液中的0.024 y〜（-1）。基于〜（13）C浓缩数据，获得了适度更高的值（0.026 y〜（-1），用于乳酸乳酸乳酸乳酸乳酸乳酸盐）。在〜25天后，基于气体形成的非生物转化率系数在未衰减的微观上降低，平均为0.0008 y〜（-1）。这可能是由于耗尽还原能力（平均值为0.12±0.10μEΩ/ g铁和18±15μeq/ g可提取的铁）。由于来自来自同一部位的碎砂岩，完整核心微观的模型衍生速率系数和未改变容量与先前微观研究的结果相处。

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