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首页> 外文期刊>Environmental Science & Technology >Estimation of Ethanol Mass Delivery to Groundwater from Silicone Polymer Mats
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Estimation of Ethanol Mass Delivery to Groundwater from Silicone Polymer Mats

机译：估算有机硅聚合物垫向地面输送的乙醇的乙醇量

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摘要

Hollow-fiber silicone tubing, coiled and shaped as mats, has been evaluated for its potential to provide predictable delivery of ethanol to aquifers to promote reducing conditions for enhanced bioremediation of a range of contaminants in groundwater. A model was developed to predict the steady-state mass flux of diffusional ethanol delivery to an external aqueous phase from an aqueous ethanol solution present inside the polymer tubing mat, and an effective diffusion coefficient of ethanol through the silicone tubing of 1.22 x 10~(-6) cm~2 s~(-1) was determined experimentally. The model was then validated in column-scale laboratory and field experiments where polymer mats configured as permeable reactive barriers maintained uniform diffusive delivery of ethanol. Steady-state mass flux delivery ratios of ethanol through the polymer tubing wall of 1.45 (±0.18) x 10~6 to 1.64 (±0.17) x 10~6 s cm~(-1) were determined under laboratory conditions, and 2.43 (± 1.47) x 10~6 s cm~(-1) under field conditions, which were found to be statistically similar to model-predicted ethanol mass flux delivery ratios.
机译：盘绕并成形为垫子的中空有机硅管材具有评估其向含水层提供可预测的乙醇输送潜力的潜力，从而促进了降低条件以增强生物修复地下水中各种污染物的能力。建立了一个模型来预测从存在于聚合物管垫内部的乙醇水溶液向外部水相扩散乙醇输送的稳态质量通量，以及乙醇通过有机硅管的有效扩散系数为1.22 x 10〜（实验确定了-6）cm〜2 s〜（-1）。然后在柱规模实验室和现场实验中验证了该模型，在该实验中，配置为可渗透反应性阻隔层的聚合物垫保持了乙醇的均匀扩散扩散。在实验室条件下测得的乙醇通过聚合物管壁的稳态质量通量输送比为1.45（±0.18）x 10〜6至1.64（±0.17）x 10〜6 s cm〜（-1），而2.43（± ±1.47）x 10〜6 s cm〜（-1）在野外条件下，发现在统计学上与模型预测的乙醇质量通量输送比相似。

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