Water-saturated column experiments were conducted to study the effect of nonwoven geotextiles on bacteria transport and deposition through two sandy porous media with grain sizes 1.05 and 3.25 mm. The breakthrough curves (BTCs) of tracer for the all porous media exhibited an asymmetrical shape with a substantial tailing, indicating that non-equilibrium and dispersive flow patterns in these porous media. The mass recovery of the bacteria from the effluent (M_eff) increased with grain size. The retention profiles (RPs) exhibited hyper-exponential behavior, especially in the finer sand. The presence of the geotextiles increased bacteria retention rate. For a given geotextile, greater retention was observed in the surrounding region close to the geotextile. Moreover, the retention of bacteria became more significant in the geotextile with a lower porosity. Results demonstrated that model simulations of bacteria transport and fate need to accurately account for both observed BTC and RP behaviors and also the geotextile placement can impact mechanisms of retention.

进行水饱和柱实验以研究非织造土工布对细菌通过两种粒度为 1.05 和 3.25 毫米的砂质多孔介质传输和沉积的影响。所有多孔介质的示踪剂的穿透曲线 (BTC) 呈现出不对称的形状，并带有大量拖尾，表明这些多孔介质中存在非平衡和分散的流动模式。细菌从流出物中的质量回收率 (M _eff) 随晶粒尺寸增加。保留剖面 (RPs) 表现出超指数行为，尤其是在较细的沙子中。土工布的存在增加了细菌保留率。对于给定的土工布，在靠近土工布的周围区域观察到更大的保留。此外，在孔隙率较低的土工布中，细菌的保留变得更加显着。结果表明，细菌运输和命运的模型模拟需要准确考虑观察到的 BTC 和 RP 行为，而且土工布的放置会影响保留机制。