| Citation: |
HUANG Jian, SHAN Huimei, PENG Sanxi, DU Hailing, CHEN Hui, ZENG Chunya. Influence of hydrodynamic factors on the migration of arsenic in river sand: Column experiment and models[J]. Hydrogeology & Engineering Geology, 2022, 49(2): 195-206. doi: 10.16030/j.cnki.issn.1000-3665.202105016
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Influence of hydrodynamic factors on the migration of arsenic in river sand: Column experiment and models
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Abstract
The riparian zone is a typical groundwater-surface water interaction zone, and there are few research reports on the behavior of arsenic in this interaction zone under different hydrodynamic conditions. In this study, the river sand samples from the riparian zone are collected to carry out indoor column experiments, the influence of different hydrodynamic factors (including flow velocity and particle size) on the migration of arsenic in the river sand are analyzed, and related models are established. The results show that (1) at a flow rate of 0.5 mL/min, the adsorption rate of the river sand on As(V) and the time required to reach an equilibrium state are both faster than those on As(III), and the smaller the particle size, the more obvious the phenomenon; at a flow rate of 1.0 mL/min, the adsorption rate of the river sand with different particle sizes on As(V) increases with the increasinng particle size, but there is no significant difference in the adsorption of As(III). (2) In a packed column filled with sand of the same particle size, the adsorption capacity of the river sand for As(III) and As(V) decreases with the increasing flow velocity. (3) Under the conditions of different flow rates and particle sizes, the migration processes of As(III) and As(V) in the sand column are more in line with the Thomas model, and the fitting R2 are higher than those of the Yoon-Nelson and Adams-Bohart models under the same conditions. Among them, at low flow rates, the Thomas model fitting R2 (≥0.94) to the migration processes of As(III) and As(V) in the particle size of 0.15−0.25 mm are significantly better than that of the larger particle size of 1.00−2.00 mm. At high flow rates, the model has little difference in fitting R2 to the migration process of arsenic in different particle sizes.
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Keywords:
- arsenic /
- river sand /
- different particle sizes /
- different flow rates /
- column experiment
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References
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HUANG Jian, SHAN Huimei, PENG Sanxi, DU Hailing, CHEN Hui, ZENG Chunya. Influence of hydrodynamic factors on the migration of arsenic in river sand: Column experiment and models[J]. Hydrogeology & Engineering Geology, 2022, 49(2): 195-206. doi: 10.16030/j.cnki.issn.1000-3665.202105016
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Figure 1.
Schematic diagram of device for up-welling (a) and down-welling (b) experiments
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Figure 2.
Flow rate = 0.5 mLmin, breakthrough curve of Br− on river sand with different particle
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Figure 3.
Flow rate = 0.5 mL/min, breakthrough curve of As on river sand with different particle size
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Figure 4.
Flow rate = 1.0 mL/min, breakthrough curve of As on river sand with different particle size
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Figure 5.
Breakthrough curve of As(III) on river sand
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Figure 6.
Breakthrough curve of As(V) on river sand