Apparatus and method for simulating heavy metal migration and transformation in soil-water interface

Abstract

The invention discloses an apparatus and a method for simulating heavy metal migration and transformation in a soil-water interface. The apparatus includes a water supply apparatus, a rainfall apparatus, a rainfall support, an initial rainwater recycling apparatus, a soil stacking box and a soil stacking box angle-regulating and fixing mechanism. The water supply apparatus is connected to the rainfall apparatus so that the water supply can transport water to the rainfall apparatus under a stable pressure. The rainfall apparatus and the initial rainwater recycling apparatus are respectively mounted on the rainfall support. The initial rainwater recycling apparatus is arranged below the rainfall apparatus and is communicated with a water supply tank of the water supply apparatus through a water backflow pipe. The soil stacking box is installed under the initial rainwater recycling apparatus through the soil stacking box angle-regulating and fixing mechanism. The apparatus is simple in structure, is convenient to operate, can achieve effective simulation on a heavy metal migration and transformation process of soil and solid wastes under the rainfall effect in a mining area, and ensures reliability and effectiveness of the simulation on the rainfall process.

Description

technical field [0001] The invention belongs to the technical fields of geological resources and geological engineering, and in particular relates to a device and method for simulating the migration and transformation of heavy metals at the soil-water interface under the action of rainfall runoff. Background technique [0002] In recent years, the intensification of industrialization has forced the development and utilization of metal mineral resources to increase day by day. During the mining area development and smelting process, a large amount of waste rocks, tailings, waste residues and smelting wastewater containing heavy metal elements are produced. Under the long-term leaching of natural rainwater, the solid waste will release heavy metal pollutants and form soil-water pollution. Heavy metal pollution flows at the interface, thereby polluting the ecological soil, farmland soil and water environment in the mining area around the mining area, seriously threatening human...

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Problems solved by technology

[0003] At present, the method of cylindrical soil column leaching is mainly used to study the leaching release characteristics of soil or solid waste in mining areas under the action of rainwater through experimental simulation. This method mainly simulates the infiltration of pollutants in soil under the action of rainfall. process, less consideration is given to the lateral migration and transformation of pollutants and the impact of lateral migration on the infiltration process, and the pollutant migration and transformation process of different slope angles and different waste ore components under different rainfall pH values ​​is rarely carried out; at the same time, the present Some simulated rainfall systems are mainly based on shower nozzles, and it is difficult to ensure the uniformity of rainfall. The rainfall bracket is made of steel material for the whole section. In many rainfall experiments, the rainfall height is difficult to change, so the rainfall coverage area cannot be effectively obtained. Assure

In summary, based on the errors brought by the rainfall system and the limitations of the soil filling box, the prediction model for the horizontal and vertical migration and transformation of heavy metals at the soil-water interface in the mining area under the action of rainfall has not been established at this stage, so that it cannot effectively remediate the soil in the mining area. , Water environment governance provides reference

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