Composite barrier against horizontal diffusion and migration of groundwater pollutants and its application

Abstract

The invention discloses a composite barrier for preventing horizontal diffusion and migration of underground water layer pollutants and application thereof. The composite barrier is formed by encapsulating expansion clay by a water-soluble polymer film. During the application, the composite barrier is placed into a vertical open groove with a watertight layer arranged at the groove bottom, the filling height of the composite barrier in the vertical open groove is not lower than the upper plane of the underground water layer, wall protecting slurry is removed, and then, soil is filled back into the vertical groove until the vertical groove is flatly filled. The composite barrier has the advantages that the construction is simple, the engineering manufacturing cost is low, the anti-seeping effect is good, and the like. The horizontal migration of pollutants in the underground water layer can be better prevented.

Description

Technical field [0001] The invention belongs to the technical field of pollutants control, and specifically relates to a composite barrier for blocking the horizontal diffusion and migration of pollutants in the groundwater layer. Background technique [0002] With the rapid development of industrialization and urbanization in our country, the groundwater environment is suffering more and more serious pollution. Around some chemical and mining parks, leakage and wastewater discharge have caused pollutants including heavy metals and organics to enter the soil and groundwater environment, causing harm to human health and the ecological environment. [0003] The environmental behavior of pollutants in soil and water is very complex, including adsorption, leaching, enrichment, vertical and horizontal migration, and so on. When pollutants migrate vertically in the soil to the groundwater layer, they will migrate horizontally along with the flow of the groundwater body; the horizontal m...

AI Technical Summary

Problems solved by technology

Commonly used grouting techniques include cement grouting and chemical grouting, but there are some problems that limit its application range

For cement grouting, due to the limitation of cement particle size, it is difficult to inject into the rock cracks of the impermeable layer, and at the same time, in the environment containing high sulfate or free carbonic acid, the cement often cannot set

Chemical grouting also has the disadvantages of expensive chemical materials and some of the grout is toxic, so it cannot be widely used, and it is not economical to use it in large quantities

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