The transport of pollutants inside the groundwater system is profoundly affected by absorption and transmission via colloid or soil particles. Therefore, it is essential to investigate the significant pollutants (Such as hexavalent chromium (Cr(VI))) transfer in the presence of colloid particles that can facilitate or retain this transfer. For this purpose, an experiment is carried out in a saturated porous media column to study the bentonite concentration, flow velocity and sand grain size effects on co-transport of Cr(VI) with bentonite. The results of this study demonstrated that the colloid particles facilitate the transfer of Cr(VI) by 30% in 200 mg/l bentonite colloids concentration. The amount of transmitted Cr(VI) is decreased by increasing the bentonite colloids concentration from 200 mg/l to 300 mg/l. As the flow velocity increased from 2 cm/min to 3.3 cm/min, the amount of transferred Cr(VI) increased by 7%. The results show that with reducing the sand grain size, the amount of transmitted bentonite and Cr(VI) is reduced that this effect is more sensible in bentonite transport. As a result, it can be noted that the bentonite colloidal particles according to its concentration and experimental conditions, may facilitate or retain the Cr(VI) transport and sand gradation has a significant impact on colloid and pollutant transmission.

污染物在地下水系统内部的传输受到胶体或土壤颗粒的吸收和传播的深刻影响。因此，在胶体颗粒的存在下研究能够促进或保持这种污染物转移的重要污染物（例如六价铬（Cr（VI）））的转移至关重要。为此，在饱和多孔介质塔中进行了一项实验，研究了膨润土的浓度，流速和砂粒尺寸对Cr（VI）与膨润土共运的影响。这项研究的结果表明，在200 mg / l的膨润土胶体浓度下，胶体颗粒可促进Cr（VI）的转移30％。通过将膨润土胶体浓度从200 mg / l增加到300 mg / l，可减少Cr（VI）的传输量。随着流速从2 cm / min增加到3.3 cm / min，Cr（VI）的转移量增加了7％。结果表明，随着砂粒尺寸的减小，膨润土和Cr（VI）的传输量减少，这种作用在膨润土的运输中更为明显。结果，可以注意到，膨润土胶体颗粒根据其浓度和实验条件可以促进或保持Cr（VI）的运输，而砂的级配对胶体和污染物的传播具有重大影响。