Measuring apparatus and measuring method for vertical effective diffusion coefficient of solutes in saturated soil layer

Abstract

The invention relates to a measuring apparatus and a measuring method for vertical effective diffusion coefficient of solutes in a saturated soil layer. The measuring apparatus includes a measuring apparatus main box, which includes, internally from bottom to top successively, a water tank, a soil test sample zone, and a solution zone. The water tank is filled with quartz sand and the soil test sample zone is filled with a soil test sample; a plurality of sampling tubes are disposed uniformly in the soil test sample zone and vertically pass through the measuring apparatus main box and are stretched into the soil test sample. The measuring method includes the steps of: firstly successively filling the measuring apparatus main box with the quartz sand and the soil test sample; sealing the sampling tubes and adding tap water to the solution zone until the soil test sample is saturated; and then replacing the tap water in the solution zone with a solution at the same liquid level height; finally, opening the sampling tubes to obtain a filtrate, and analyzing the filtrate to determine the vertical effective diffusion coefficient of the solutes in the saturated soil layer. Compared with the prior art, the measuring apparatus has simple structure and accurate and reliable measurement result.

Description

technical field [0001] The invention relates to a device and method for measuring vertical diffusion coefficient, in particular to a device and method for measuring vertical effective diffusion coefficient of solute in a saturated soil layer. Background technique [0002] At present, the disposal of solid waste in most countries is still dominated by landfill, and the simple landfill of waste is a source of pollution to groundwater resources. The pollution source is washed away by the rain, and the pollutants produced are vertically diffused in the saturated soil layer and migrate to the deep soil layer, thereby polluting the groundwater resources. Therefore, mastering the vertical diffusion law of pollutants in saturated soil layer is helpful for the isolation of pollutants. [0003] In addition, with the development of society, more and more underground buildings have been put into use, and the discharge of industrial, agricultural, and domestic waste will cause solutes t...

AI Technical Summary

Problems solved by technology

The traditional solute vertical diffusion device in the saturated soil layer is single, and the solute concentration is obtained through complex procedures such as extracting the test soil sample and acid extraction. The process of extracting the test soil sample is prone to errors, and the resulting error is relatively large; It is difficult to ensure that the soil sample is saturated before the test, which leads to the phenomenon of solution seepage during the test, which accelerates the migration of the solute and causes test errors; secondly, the water in the solution is volatile during the test, which leads to an increase in the concentration of the solution, which causes errors in the test; at the same time In the traditional saturated soil layer, the side wall of the solute vertical diffusion device and the pores of the soil sample are relatively large, the solute concentration at the side wall increases, and the solute diffuses from the side wall, resulting in test errors or even test failures

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