Device and method for simulating migration and transformation of pollutants in freeze-thawing process of soil

Abstract

The invention relates to a device for simulating the migration and transformation of pollutants in a freeze-thawing process of soil. The device comprises four parts: a freeze-thawing box, a heating device, a refrigerating device and a controller, wherein the freeze-thawing box consists of a box body and a cold-air plate; two side surfaces of the box body are provided with glass windows, a space used for mounting the cold-air plate is reserved on the top part of the box body, and the cold-air plate is uniformly provided with air holes; two diagonals of the box body are equidistantly provided with temperature sensors; a plurality of earth column barrels are arranged in the box body, thermistor thermometers are vertically arranged on an upper layer, a middle layer and a lower layer in each earth column barrel, and each earth column barrel is connected with the controller; displacement sensors are arranged on the top plates above the earth column barrels, and the heating device is arranged at the bottom part of the freeze-thawing box; the refrigerating device is connected with a cold room; and the controller is arranged on the outer part of the freeze-thawing box, and connected with the freeze-thawing box, the heating device, the refrigerating device, the thermistor thermometers and the temperature sensors respectively.

Description

technical field [0001] The invention relates to a soil freezing and thawing simulation device, in particular to a simulation experiment device and method for the migration and transformation of pollutants in the soil during the freezing and melting process of soil water when farmland soil pollutants migrate in middle and high latitude regions. It belongs to the field of environmental engineering and agricultural engineering. Background technique [0002] With the economic development of our country, the environmental problems are becoming more and more serious, especially the pollution of water environment is becoming more and more serious. With the large-scale development of agriculture, agricultural non-point source pollution has become one of the main causes of water environment problems in the basin. On the one hand, the large-scale application of chemical fertilizers and pesticides in the process of agricultural production, as well as irrational tillage, lead to the lo...

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Problems solved by technology

The device is made of stainless steel, heat-insulating and anti-freezing glass and transparent heat-insulating and anti-freezing plastic. The experiment tracks and observes the changes of soil temperature and freezing depth during the process of soil freezing and thawing, and solves the problem of moisture in the soil during seasonal freezing and thawing periods of farmland in mid-high latitudes. and the scientific problems of migration and transformation of non-point source pollutants; the simulation of soil freezing by this method is realized in a top-down manner from the soil surface, and the simulation of the soil melting process is realized through top-down and upward from the maximum freezing depth. ways to achieve

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