One-dimensional simulator of solute migration and transformation in deep phreatic water

Abstract

The invention belongs to the technical field of hydrogeology, earth science, environmental science and engineering research and provides a one-dimensional simulator of solute migration and transformation in deep phreatic water, which is high in safety and simple. The one-dimensional simulator comprises a water tank, a booster pump, a one-way valve, a safety valve, an aquifer dielectric column with special flange structure, a needle valve and a sampling device that are connected sequentially in succession, the aquifer dielectric column with the special flange structure is placed in a thermostatic control unit working chamber for controlling temperature. The use of the one-dimensional simulator has the following advantages that the simulator is simple in design, easy to operate and convenient to maintain, temperature and hydraulic pressure controlling is accurate, adjusting is convenient, the simulator can simulate a hydraulic pressure up to 10 MPa, is suitable for an experimental environment at 4-65 DEG C under pH 6.5-9, can effectively simulate pressure of the deep phreatic water as well as a low-temperature geothermal environment, can be operated stably in a long time and is free of limitations from ambient temperature.

Description

technical field [0001] The invention belongs to the technical fields of hydrogeology, earth science, environmental science and engineering research, and particularly relates to a one-dimensional simulation device for solute migration and transformation in deep groundwater under the action of low-temperature geothermal heat and high water pressure. Background technique [0002] Groundwater is an important source of water for industry, agriculture, and domestic use in my country. The unreasonable development and utilization of the groundwater level caused by the continuous decline and the change of the groundwater storage environment have caused the problem of groundwater quality to shift from the shallow layer to the deep layer. The indoor soil column simulation experiment of solute is an important research method to study the migration and transformation mechanism of solute in groundwater. The existing one-dimensional soil column simulation experiment devices are mostly limit...

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Problems solved by technology

[0003] Previous studies have shown that the current one-dimensional simulation device for solutes in groundwater has the following defects: First, the soil column device used at this stage, such as the "temperature-controlled pressure-controlled groundwater flow pollution simulation" designed by Ma Chuanming et al. system", although the temperature can be adjusted by heating in a water bath, the soil column device and the sampling pipeline must be designed as double-layer pipelines, and the water tank must also be designed as a box with a jacket so that the constant temperature water can pass through the The outer tube of the soil column and the jacket of the water tank carry out circulating flow to conduct indirect heat exchange for the research material in the inner tube and the soil column to achieve the purpose of temperature control. Regular water replenishment, cumbersome operation process, difficult maintenance and easy damage of the device, limit the application in indoor pollution simulation

Second, although the soil column device currently used is equipped with a pressure control device for precise pressure control, it does not specify the maximum water pressure that can be simulated. For example, the "temperature control-pressure control groundwater flow pollution simulation system”, because the designed soil column material is plexiglass tube, the simulated environment is limited to normal pressure and low pressure hydraulic conditions, most of the simulated groundwater environment systems are vadose zone and the buried depth is less than 200m, and the simulation device cannot withstand high The water pressure is as high as 5MPa; thirdly, in the soil column device used at this stage, the column flanges are mostly flat design, and the lining gasket between the flanges is made of pure rubber, which cannot withstand high water pressure and is easy to Leakage and Damage

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