Leaching device used in vertical transfer of pollutants in soil

Abstract

The invention relates to a leaching device used in vertical transfer of pollutants in soil. The leaching device comprises a spray nozzle, a water flow meter, a leaching column for holding an experimental earth pillar and a percolate accommodating container, wherein, the leaching column is internally provided with at least two filter layers capable of filtering leaching liquid, a filter layer structure is respectively arranged on the upper and lower ends of the experimental earth pillar, and each filter layer is provided with a filter screen layer, a filter bulb layer and a filter paper layer; and in addition, the height of the leaching column body is 90cm-150cm, and the inner diameter of the cross section of the column body is 5cm-15cm. The leaching device has the advantages that on the basis of the large axial size of the leaching column, vertical transfer of the pollutants in the profile of the deeper soil can be simulated; by setting the water flow meter, the flow velocity and flow rate of injection water can be accurately controlled; by setting the upper filter layer, the injection water can be uniformly sprayed; and by setting the lower filter layer, the filter effect can be ensured and percolate can be timely and effectively discharged.

Description

technical field [0001] The invention relates to an experimental device for testing the migration of pollutants in soil, in particular to a leaching device for longitudinal migration of pollutants in soil. Background technique [0002] Soil is the material basis and environmental conditions for human survival and development. With the intensification of industrial pollution and the increasing application of agricultural chemicals, soil pollution is becoming more and more serious. Soil pollution not only leads to food safety problems of agricultural products, but also pollutes groundwater through leaching, and then endangers human health and life through the food chain. [0003] In order to control and treat soil pollution, there are more and more demands for simulation experiments on pollutant migration, leaching and transformation and utilization. As a routine experimental method, indoor soil column leaching simulation experiment has been relatively mature after years of t...

AI Technical Summary

Problems solved by technology

The existing soil column leaching simulation experiment equipment can be divided into three types: horizontal leaching, vertical leaching and bidirectional leaching. For vertical leaching equipment, most indoor soil columns are not long enough due to the axial dimension of the cylindrical structure ( Usually less than 70cm) and lack of representativeness, unable to simulate the longitudinal transport of pollutants in deeper soil profiles

Secondly, in the traditional soil column experiment, because few operators install high-precision flow meters at the water injection port of the leaching equipment, the accuracy of water injection flow rate and total volume control is not high

Furthermore, if the top of the leaching device is not equipped with a structure for dispersing and filtering water, the water injection will be uneven, and the physical properties of the soil such as soil density and hydraulic conductivity will be damaged.

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