饱和多孔介质中离子强度对颗粒输运行为影响的实验室研究

Bennacer Lyacine, Kernou Nassim, Benmammar Djilali
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引用次数: 0

摘要

实验研究了饱和多孔介质中流速和离子强度对悬浮粒子(SP)迁移及其沉积的影响。SP注入采用实验室填充砂柱和脉冲注入法进行。离子强度在0 ~ 600 mM (NaCl)之间。测试了两种速度:0.15和0.30 cm/s。选择的多分散颗粒直径范围为0.27 ~ 5 μm,中位直径(dp50)为2.25 μm。采用一阶沉积动力学对流-色散方程的解析解来描述实验突破曲线和确定输运参数。结果表明,离子强度的增加促进了SP在多孔介质中的滞留。此外,在流速较低的情况下,滞留率更为重要。沉积动力学系数随离子强度和流速的增大而增大。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Laboratory Studies on the Influence of Ionic Strength on Particle Transport Behavior in a Saturated Porous Medium
An experimental study has been undertaken to investigate the effect of flow velocity and ionic strength on the transport of suspended particles (SP) and their deposition in a saturated porous medium. The SP injections were carried out using a laboratory column filled with sand and a pulse injection method. Ionic strengths varying between 0 and 600 mM (NaCl) have prospected. Two velocities were tested: 0.15 and 0.30 cm/s. Selected polydisperse particles diameters ranging from 0.27 to 5 μm and a median diameter (dp50) equal to 2.25 μm were used. An analytical solution of the convection–dispersion equation with first-order deposition kinetics was used to describe the experimental breakthrough curves and to identify the transport parameters. The results show that the increase of ionic strength promotes the retention of the SP in the porous medium. In addition, retention is more important when the flow velocity is low. The deposition kinetics coefficient increases with increasing ionic strength and flow velocity.
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