What is it about?
The capillary zone has a strong blocking effect on the infiltration process of LNAPL (Light Non-Aqueous Phase Liquid) pollutants into the groundwater. In the capillary zone of homogeneous media, the moisture content shows a decreasing trend as the height from the groundwater level increases. Therefore, through laboratory experiments and numerical simulation methods, we analyzed the influencing process of the moisture content in a single homogeneous medium on the dynamic blocking of LNAPL pollutant migration by the capillary zone. Based on the theory of multiphase flow kinematics in porous media, the influence mechanism of the moisture content on the dynamic migration of LNAPL pollutants was revealed.
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Why is it important?
These findings unequivocally indicate that an increase in the moisture content leads to a decrease in the relative permeability of the NAPL phase in unsaturated media, which is the fundamental reason for the retarded kinetic migration of LNAPL pollutants.
Perspectives
I hope this article can enable everyone to recognize the influence of the changes in moisture content in the capillary zone, which is the interface between the unsaturated zone and groundwater, on the infiltration process of LNAPL pollutants into the groundwater. The existence of the capillary zone with the characteristic of moisture content variation in a single homogeneous medium also has a blocking effect on the infiltration of LNAPL pollutants.
Kexue Han
Read the Original
This page is a summary of: Effect and mechanism of the moisture content on the kinetic retardation of LNAPL pollutant migration by the capillary zone, Journal of Hazardous Materials, April 2025, Elsevier,
DOI: 10.1016/j.jhazmat.2025.137266.
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