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Chlorinated Ethene Degradation Rate Coefficients Simulated with Intact Sandstone Core Microcosms
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2020-11-19 , DOI: 10.1021/acs.est.0c05083 Rong Yu 1 , Lawrence C. Murdoch 1 , Ronald W. Falta 1 , Richard G. Andrachek 2 , Amanda A. Pierce 3 , Beth L. Parker 3 , John A. Cherry 3 , David L. Freedman 1
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2020-11-19 , DOI: 10.1021/acs.est.0c05083 Rong Yu 1 , Lawrence C. Murdoch 1 , Ronald W. Falta 1 , Richard G. Andrachek 2 , Amanda A. Pierce 3 , Beth L. Parker 3 , John A. Cherry 3 , David L. Freedman 1
Affiliation
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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 13C 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.
中文翻译：
完整砂岩岩心微观模型模拟的氯化乙烯降解速率系数
三氯乙烯（TCE）在裂隙多孔岩石（例如砂岩）中的非生物转化对于表征和定量具有挑战性。这项研究的目的是估计扩散为主的完整核心微观世界中的拟一级生物反应速率系数。微观世界通过在注入TCE的砂岩岩心上方的腔室中交换未受污染的地下水（未经修正或经乳酸修正）来模拟干净的流过紧挨着受污染的岩石基质的裂缝。速率系数是使用针对监控数据校准的微观世界的数值模型评估的。TCE完全脱氯为乙炔，乙烯和乙烷的平均初始速率系数在未修正的微观世界中估计为0.019 y –1，而在0.024 y –1时估计为在乳酸修正的微观世界中。根据13 C富集数据获得了较高的值（未修正的值为0.026 y –1，乳酸修正的为0.035 y –1）。在约25天后，未经修正的微观世界中基于气体形成的非生物转化率系数降低至平均0.0008 y –1。推测这是由于还原能力的消耗（铁的平均值为0.12±0.10μeeq/ g，可提取铁的平均值为18±15μeeq/ g）。完整的核心微观世界的模型得出的速率系数和还原能力与先前使用同一地点的碎砂岩进行的微观世界研究的结果非常吻合。
更新日期：2020-12-15
中文翻译：
完整砂岩岩心微观模型模拟的氯化乙烯降解速率系数
三氯乙烯（TCE）在裂隙多孔岩石（例如砂岩）中的非生物转化对于表征和定量具有挑战性。这项研究的目的是估计扩散为主的完整核心微观世界中的拟一级生物反应速率系数。微观世界通过在注入TCE的砂岩岩心上方的腔室中交换未受污染的地下水（未经修正或经乳酸修正）来模拟干净的流过紧挨着受污染的岩石基质的裂缝。速率系数是使用针对监控数据校准的微观世界的数值模型评估的。TCE完全脱氯为乙炔，乙烯和乙烷的平均初始速率系数在未修正的微观世界中估计为0.019 y –1，而在0.024 y –1时估计为在乳酸修正的微观世界中。根据13 C富集数据获得了较高的值（未修正的值为0.026 y –1，乳酸修正的为0.035 y –1）。在约25天后，未经修正的微观世界中基于气体形成的非生物转化率系数降低至平均0.0008 y –1。推测这是由于还原能力的消耗（铁的平均值为0.12±0.10μeeq/ g，可提取铁的平均值为18±15μeeq/ g）。完整的核心微观世界的模型得出的速率系数和还原能力与先前使用同一地点的碎砂岩进行的微观世界研究的结果非常吻合。
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