<abstract xmlns="http://www.w3.org/1999/xhtml">The coupled transport of heavy metals with suspended particles has been a topic of growing interest. The main purpose of this study is to experimentally investigate the seepage transport of heavy metal Pb2+ in the presence of silicon powders (SPs) through a sand column under different seepage velocities (<italic>v</italic> = 0.087–0.260 cm/s), injection Pb2+ concentrations (<italic>C</italic>P = 0–800 μg/ml) and SP sizes (<italic>D</italic>50 = 2.8–25.5 μm), which were likely to be encountered in practical engineering. The sand column was installed in a cylindrical chamber of 300 mm in length and 80 mm in internal diameter. The results clearly show that the increase in acidity results in a reduction of the repulsive interactions between SPs and the matrix, and consequently a decrease in the peak values in breakthrough curves (BTCs), especially for larger-sized SPs. The peak values and recovery rate of Pb2+ are obviously increased and an earlier breakthrough can be observed, due to the higher capacity of SPs with negative charge to adsorb heavy metal pollutants such as Pb2+ with positive charge. The adsorption of Pb2+ on SPs can reduce the repulsive forces between SPs and the matrix, thus resulting in the increase of the deposition possibility of SPs and the decrease of peak value and recovery rate.</abstract>

The coupled transport of heavy metals with suspended particles has been a topic of growing interest. The main purpose of this study is to experimentally investigate the seepage transport of heavy metal Pb2+ in the presence of silicon powders (SPs) through a sand column under different seepage velocities (v = 0.087–0.260 cm/s), injection Pb2+ concentrations (CP = 0–800 μg/ml) and SP sizes (D50 = 2.8–25.5 μm), which were likely to be encountered in practical engineering. The sand column was installed in a cylindrical chamber of 300 mm in length and 80 mm in internal diameter. The results clearly show that the increase in acidity results in a reduction of the repulsive interactions between SPs and the matrix, and consequently a decrease in the peak values in breakthrough curves (BTCs), especially for larger-sized SPs. The peak values and recovery rate of Pb2+ are obviously increased and an earlier breakthrough can be observed, due to the higher capacity of SPs with negative charge to adsorb heavy metal pollutants such as Pb2+ with positive charge. The adsorption of Pb2+ on SPs can reduce the repulsive forces between SPs and the matrix, thus resulting in the increase of the deposition possibility of SPs and the decrease of peak value and recovery rate.

The seepage transport of heavy metal Pb2+ through sand column in the presence of silicon powders

Journal of Hydrology and Hydromechanics

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

The seepage transport of heavy metal Pb through sand column in the presence of silicon powders

The coupled transport of heavy metals with suspended particles has been a topic of growing interest. The main purpose of this study is to experimentally...

The seepage transport of heavy metal Pb²⁺ through sand column in the presence of silicon powders

Publié en ligne: 15 nov. 2019

Pages: 349 - 358

Reçu: 14 mars 2018

Accepté: 09 oct. 2018

DOI: https://doi.org/10.2478/johh-2019-0016

Mots clés
Seepage transport, Silicon powder, Heavy metal, Coupled effect, Sand column

© 2019 Bing Bai et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

The seepage transport of heavy metal Pb2+ through sand column in the presence of silicon powders

Publié en ligne: 15 nov. 2019

Pages: 349 - 358

Reçu: 14 mars 2018

Accepté: 09 oct. 2018

DOI: https://doi.org/10.2478/johh-2019-0016

Mots clésSeepage transport, Silicon powder, Heavy metal, Coupled effect, Sand column

© 2019 Bing Bai et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

The seepage transport of heavy metal Pb²⁺ through sand column in the presence of silicon powders

Mots clés
Seepage transport, Silicon powder, Heavy metal, Coupled effect, Sand column