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The Promotion/Inhibition of the Seepage Transport of Copper Ions by Suspension-Colloidal Particles with Wide Size Gradation
Geofluids ( IF 1.7 ) Pub Date : 2021-05-30 , DOI: 10.1155/2021/9920415
Qingke Nie 1, 2 , Huawei Li 1, 2 , Haipeng Yang 2 , Tengfei Ni 3 , Sichen Jiang 3
Affiliation  

Sand column tests were conducted to investigate the seepage transport of silicon powders (SPs) with two wide particle size ranges (30-2000 nm and 2-70 μm), including the cotransport of SPs and copper ions. The results show that the graded large-scale SP has an obvious inhibiting influence on the transport of copper ions. In contrast, in the presence of the graded small-scale SP, the concentration of copper ions in the effluent tends to increase; i.e., there appears to be a promoting effect. However, after a long transport distance, the presence of SPs, regardless of particle size, has an overall retarding effect on heavy metal pollutants (e.g., copper ions). The promoting effect of the increase in seepage velocity on the concentration of copper ions in the effluent is greater with the graded large-scale SPs than with the graded small-scale SPs. In terms of the microstructural characteristics by metallographic microscopy, the average particle size of the deposited graded small-scale SPs is almost constant at different transport distances, while that of the deposited graded large-scale SPs tend to decrease significantly with increasing transport distance; i.e., notable bed filtration is exhibited in the latter case. This physical mechanism also determines the sequence and rate of the retarding effect of SPs on heavy metal ions under seepage flow.

中文翻译:

宽尺寸级联的悬浮胶体颗粒对铜离子渗透输运的促进/抑制

进行沙柱测试以研究具有两种宽粒度范围(30-2000 nm 和 2-70  μm),包括 SP 和铜离子的共转运。结果表明,分级大尺度SP对铜离子的迁移有明显的抑制作用。相比之下,在分级小规模SP存在的情况下,出水铜离子浓度有增加的趋势;即似乎有促进作用。然而,经过长距离传输后,无论颗粒大小如何,SPs 的存在都会对重金属污染物(例如铜离子)产生整体阻滞作用。渗流速度的增加对出水铜离子浓度的促进作用对于分级的大型SPs比分级的小规模SPs更大。从金相显微镜观察的显微组织特征来看,沉积的分级小尺度SPs的平均粒径在不同输运距离下几乎保持不变,而沉积的分级大尺度SPs的平均粒径随着输运距离的增加而显着减小;即,在后一种情况下表现出显着的床过滤。这种物理机制也决定了 SPs 对渗流下重金属离子阻滞作用的顺序和速率。
更新日期:2021-05-30
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