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首页> 外文期刊>Environmental Science & Technology >Measurement of Mixing-Controlled Reactive Transport in Homogeneous Porous Media and Its Prediction from Conservative Tracer Test Data
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Measurement of Mixing-Controlled Reactive Transport in Homogeneous Porous Media and Its Prediction from Conservative Tracer Test Data

机译：均相多孔介质中混合控制反应输运的测量及其从保守示踪剂测试数据的预测

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摘要

Numerical and theoretical studies have indicated that pore-scale mixing can be the limiting process for reactions among dissolved compounds in porous media. It has been claimed that multicomponent reactions in porous media could be accurately estimated using mixing coefficients obtained from point-like measurements of conservative tracer concentrations. In this study, we verify these concepts experimentally by tracer tests in a homogeneously packed saturated sand column. Fiber-optic fluorometry was applied to detect point-related concentrations of fluorescein, which was used as both the conservative and the reactive tracer. In the reactive tracer experiment, an acidic solution containing the tracer was displaced by an alkaline solution without tracer. Since the fluorescence of fluorescein is quenched at low pH, the fluorescence intensity measured in the reactive breakthrough curve indicated the mixing of the two solutions. The measured reactive breakthrough curves were compared to predictions based on the conservative breakthrough curves. Predictions and measurements agreed well. Our results imply that incomplete mixing on the pore scale is of minor significance for field-scale applications. On this scale, however, even weak sorption might influence mixing significantly.
机译：数值和理论研究表明，孔垢混合可能是多孔介质中溶解的化合物之间反应的限制过程。据称，可以使用从保守示踪剂浓度的点状测量获得的混合系数，准确估算多孔介质中的多组分反应。在这项研究中，我们通过在均质填充的饱和砂柱中进行的示踪试验，通过实验验证了这些概念。光纤荧光法用于检测荧光素的点相关浓度，荧光素既用作保守示踪剂，又用作反应示踪剂。在反应示踪剂实验中，含有示踪剂的酸性溶液被不含示踪剂的碱性溶液置换。由于荧光素的荧光在低pH下淬灭，因此在反应性穿透曲线中测得的荧光强度表明两种溶液的混合。将测得的反应性突破曲线与基于保守性突破曲线的预测值进行比较。预测和测量结果一致。我们的结果表明，在孔隙规模上不完全混合对于现场规模应用而言意义不大。然而，在这个规模上，即使弱吸附也可能显着影响混合。

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