Visual microscopic channel model for simulating migration process of pollutants in porous medium containing preferential flow

Abstract

The invention relates to the field of soil and groundwater pollution remediation, and provides a visual microscopic channel model for studying the flowing of environmental pollutants in a porous medium containing a preferential flow. The model comprises an inlet, an inlet section, a microchannel, an outlet section and an outlet which are etched on a silicon wafer, wherein a plurality of micro-columns which are arranged in a staggered mode are arranged in the microchannel, a soil complex pore structure containing preferential flow in the underground environment can be truly simulated by arranging a micro-column array, the height of the micro-columns is the same as the depth of the microchannel, a glass slide is arranged on the top of the silicon wafer, and the glass slide is connected with the microchannel and the silicon wafer in a sealed mode. The model has the beneficial effects that the migration process of the pollutants in the porous medium containing the preferential flow under the pore scale is simulated, and the migration and retention characteristics of the pollutants in the porous medium containing the preferential flow are more truly reflected; the understanding of the removal mechanism of pollutants in the underground water-containing porous medium containing the preferential flow is improved; and the microscopic channel model is good in light transmission and visibility, so that data images can be conveniently acquired and processed.

Description

technical field [0001] The invention relates to the field of soil and groundwater pollution restoration, in particular to a visualized microscopic channel model for studying the migration process of environmental pollutants in porous media containing preferential flow. Background technique [0002] In recent years, with the rapid economic development, people's demand for water resources has been increasing, resulting in serious damage to groundwater resources. Once groundwater is polluted, there is no technology that can clean it completely. Carrying out the migration and removal behavior of pollutants (such as microorganisms, nanoparticles or nanoplastics, etc.) in the environment, especially in aqueous media, plays a key role in accurately predicting the exposure probability of pollutants and various organisms. Preferential flow refers to the rapid migration of water and solutes to the deep soil and groundwater along preferential paths bypassing the matrix. Soils that fo...

AI Technical Summary

Problems solved by technology

However, at present, most of the research on the migration process of pollutants in the environment is concentrated in laboratory column experiments, so laboratory column experiments cannot observe the microscopic migration process of pollutants in porous media with preferential flow, and cannot clarify the priority The effect of flow on the transport mechanism of pollutants

Chinese patent (CN107036951A) discloses a micro-channel model for simulating the internal flow of porous media. This model realizes the visual measurement of the flow details in the micro-channel by simulating the pore structure inside the core, but it cannot obtain the preferential flow inside the porous media. Fluid Flow Effects

Images