Device for simulating the migration of freeze-thaw water and soluble contaminants

Abstract

The utility model provides a simulation freeze -thaw moisture, soluble contaminant migration test device, and considers the soluble contaminant migration test device under the action of freeze -thaw and thawing, can truly reaction seasonal frozen soil area soluble contaminant migration rule of nature, simulation soluble contaminant migration mode in the soil, the utility model discloses a test soil column, displacement meter, temperature sensor and data collector, test soil column has reserved multiple groups of reserved holes on the side of cylinder wall for burying temperature sensor, displacement meter is fixed through the hoop on the cylinder wall of test soil column top, the dial gauge of displacement meter contacts the top of soil sample, test soil column includes multiple section cylindrical cylinder, multiple section cylindrical cylinder is connected through flange plate and bolt, the utility model discloses be used for simulating the contaminant migration test under the action of freeze -thaw and thawing.

Description

Technical Field

[0001] This utility model belongs to the field of soil pollution and relates to a test device for simulating freeze-thaw water and the migration of soluble pollutants. Background Technology

[0002] In recent years, amidst the accelerated industrialization process in my country, metallic minerals have been extensively mined and applied to daily life and production. Initially, due to a lack of environmental awareness, many industrial parks exhibited weak environmental safety consciousness and adopted relatively crude management methods. Large quantities of heavy metals were indiscriminately dumped, and industrial wastewater and exhaust gases containing heavy metal pollution were discharged arbitrarily. Mining, metal smelting, vehicle exhaust emissions, excessive application of fertilizers, and sewage irrigation all contributed to the accumulation of heavy metals in the soil through atmospheric deposition and surface runoff, threatening food security and hindering my country's agricultural development. As a major agricultural country, my country has vast farmlands, with the black soil of Northeast my country being a typical example and a crucial commodity grain production area. This black soil region is located in a seasonally frozen soil zone, where the soil undergoes a series of changes due to freeze-thaw cycles. The transport of soluble heavy metal pollutants in the soil, essentially like other solutes, involves redistribution within the soil along with water movement. Therefore, water movement plays a dominant role in the migration of heavy metal pollutants in the soil. Therefore, research considering the effects of freeze-thaw cycles and snowmelt on soluble pollutants is of great significance. Current research on soil pollution primarily focuses on the migration patterns of pollutants at specific locations or during certain processes, influenced by leaching and temperature changes. Studies considering freeze-thaw cycles and snowmelt are relatively few. An experimental device for the migration of soluble pollutants under freeze-thaw cycles and snowmelt can realistically reflect the migration patterns of soluble pollutants in seasonally frozen soil regions, simulating the migration pathways of soluble pollutants in soil. Utility Model Content

[0003] The purpose of this invention is to provide a test device for simulating freeze-thaw moisture and the migration of soluble pollutants.

[0004] The above objectives are achieved through the following scheme: A test apparatus for simulating freeze-thaw moisture and the migration of soluble pollutants comprises a test soil column, a displacement gauge, a temperature sensor, and a data acquisition unit. The test soil column has transverse and lateral holes pre-drilled on its side wall for embedding the temperature sensor and for subsequent sampling at the end of the test. The test soil column is composed of three sections of plexiglass cylinders connected by flanges and bolts. The flanges have sealing grooves, and sealing rings are installed in the sealing grooves during connection.

[0005] The displacement gauge is fixed above the soil column by a hoop and is used to detect soil settlement during the test. The temperature sensor and data acquisition device are used in a layered, compacted soil sample system, with a temperature sensor embedded in each layer. The data acquisition device uses the temperature sensors to reflect temperature changes in the soil layers.

[0006] A test method for a simulated freeze-thaw moisture and soluble pollutant migration test device, the method includes the following steps: (1) When considering freeze-thaw action, soil column 3 is not used at this time. Soil columns 1 and 2 are assembled and placed in a low temperature laboratory. Temperature sensors are installed at different reserved holes in the cylinder wall, and the temperature changes of different soil layers are monitored in real time by a data acquisition device. The amount of soil frost heave is determined by a displacement gauge. The internal temperature and displacement changes of soil under different ambient temperatures can be studied.

[0007] (2) When considering the snow melting effect, the displacement meter is not used. The soil sample is layered and loaded into the assembled soil columns 1 and 2. During the melting stage, the soil columns 3 and 2 are connected to simulate the movement of soluble pollutants in the soil-snow interface as the snow falls. The temperature change at different locations of the soil column is monitored by connecting a temperature acquisition device.

[0008] (3) After the test, soil samples were taken out from the pre-reserved holes in the cylinder wall for testing and analysis to obtain the migration of water and soluble pollutants in the longitudinal and lateral directions under different effects.

[0009] The beneficial effects of this utility model are: 1. The experimental device and implementation method of this utility model can better match the actual pollution environment on site through indoor simulation experiments, obtain more accurate experimental results, and then propose more reasonable prevention and control measures based on the experimental results.

[0010] 2. The experimental device for simulating the migration of moisture and soluble pollutants under freeze-thaw and snow-melting conditions of this utility model, when considering freeze-thaw effects, connects devices 1 and 2 into a whole via flanges for testing. When considering snow-melting, snow-covering operations can be carried out by connecting device 3 at the top via flanges, based on the freeze-thaw test.

[0011] 3. The experimental device for simulating the migration of moisture and soluble pollutants under freeze-thaw and snow melting conditions of this utility model analyzes the migration patterns of moisture and pollutants at different locations in the soil under freeze-thaw and snow melting conditions by taking samples through pre-drilled holes in different horizontal and vertical directions.

[0012] 4. The experimental device for simulating the migration of moisture and soluble pollutants under freeze-thaw and snow melting conditions of this utility model has a reserved hole in the cylinder wall. After the test, samples can be taken directly at the reserved hole, which is convenient for sampling and testing and simple to operate.

[0013] 5. This utility model relates to a test device for simulating the migration of moisture and soluble pollutants under freeze-thaw and snow melting conditions. A displacement gauge contacts the top of the soil sample, and a dial gauge is used to obtain the frost heave of the soil. Temperature sensors buried at different locations are used, and a data acquisition device monitors the temperature changes of different soil layers in real time. Attached Figure Description

[0014] Appendix Figure 1 This is a schematic diagram of the structure of this utility model; Appendix Figure 2 This is a schematic diagram of the structure of this utility model before assembly; Appendix Figure 3 This is a top view of the present invention; Appendix Figure 4 This is a top view of the flange of this utility model.

[0015] In the diagram: 1, 2, and 3 are connected by flanges to form a test soil column; 4, flange; 5, displacement gauge; 6, temperature sensor; 7, data acquisition device; 8, pre-drilled hole in the cylinder wall; 9, flange bolt hole. Detailed Implementation

[0016] Example 1:

[0017] The test soil column has transverse and lateral holes pre-drilled on the side of the cylinder wall for embedding temperature sensors and for sampling after the test.

[0018] The test soil column is composed of three sections of plexiglass cylinders connected by flanges. The three sections of plexiglass cylinders are connected by flanges and bolts. The flanges are provided with sealing grooves, and sealing rings are installed in the sealing grooves during connection.

[0019] The displacement gauge is fixed above the soil column by a hoop and is used to detect soil settlement during the test.

[0020] The temperature sensor and data acquisition device are used to compact the soil sample in layers and embed temperature sensors in each layer. The data acquisition device uses the temperature sensors to reflect the temperature changes of the soil layers.

[0021] The test soil column is made of plexiglass; the test soil column is fitted with a scale; the dial gauge in the displacement meter is in contact with the top of the soil sample.

[0022] Example 2:

[0023] According to the simulated freeze-thaw moisture and soluble contaminant migration test apparatus described in Example 1, when considering the freeze-thaw effect, apparatus 1 and 2 are connected as a whole via flanges for testing. When considering snow melting, snow covering operations can be carried out by connecting apparatus 3 at the top via flanges, based on the freeze-thaw test.

[0024] Example 3:

[0025] According to the simulated freeze-thaw moisture and soluble pollutant migration test device described in Example 1, by taking samples at different horizontal and vertical reserved holes in the cylinder wall, the migration patterns of moisture and pollutants at different locations in the soil under freeze-thaw action are analyzed.

[0026] Example 4:

[0027] According to the simulated freeze-thaw moisture and soluble pollutant migration test device described in Example 1, a displacement gauge contacts the top of the soil sample, and the soil displacement is obtained through a dial gauge. Temperature sensors are installed at regular intervals, and the temperature changes of different soil layers are monitored in real time through a data acquisition device to record the freeze-thaw conditions.

[0028] Example 5:

[0029] According to the simulated freeze-thaw moisture and soluble pollutant migration test device described in Example 1, a reserved hole is set in the cylinder wall. After the test, the sample is directly taken at the reserved hole, which is convenient for sampling and testing and simple to operate.

[0030] Example 6:

[0031] A test method for a simulated freeze-thaw moisture and soluble pollutant migration test device, the method includes the following steps: (1) When considering freeze-thaw action, soil column 3 is not used at this time. Soil columns 1 and 2 are assembled and placed in a low temperature laboratory. Temperature sensors are installed at different reserved holes in the cylinder wall, and the temperature changes of different soil layers are monitored in real time by a data acquisition device. The amount of soil frost heave is determined by a displacement gauge. The internal temperature and displacement changes of soil under different ambient temperatures can be studied.

[0032] (2) When considering the snow melting effect, the displacement meter is not used. The soil sample is layered and loaded into the assembled soil columns 1 and 2. During the melting stage, the soil columns 3 and 2 are connected to simulate the movement of soluble pollutants in the soil-snow interface as the snow falls. The temperature change at different locations of the soil column is monitored by connecting a temperature acquisition device.

[0033] (3) After the test, soil samples were taken out from the pre-reserved holes in the cylinder wall for testing and analysis to obtain the migration of water and soluble pollutants in the longitudinal and lateral directions under different effects.

Claims

1. A device for simulating freeze-thaw moisture and the migration of soluble pollutants, characterized in that: Its components include a test soil column, a displacement gauge, a temperature sensor, and a data acquisition device. The test soil column has transverse and lateral holes pre-drilled on its side wall for embedding the temperature sensor and for subsequent sampling at the end of the test. The test soil column is composed of three sections of plexiglass cylinders connected by flanges and bolts. The flanges have sealing grooves, and sealing rings are installed in the sealing grooves during connection. The displacement gauge is fixed above the soil column by a hoop to detect soil frost heave during the test. The temperature sensor and data acquisition device are used to reflect temperature changes in the soil layers by compacting the soil sample in layers and embedding a temperature sensor in each layer.

2. The apparatus for simulating freeze-thaw moisture and soluble contaminant migration according to claim 1, characterized in that: The test soil column is made of plexiglass; the test soil column is fitted with a scale; the dial gauge in the displacement meter is in contact with the top of the soil sample.

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