System and method for testing migration and obstruction of non-aqueous phase liquid pollutants in underground water

Abstract

The invention provides a system for testing migration and obstruction of non-aqueous phase liquid pollutants in underground water. The system comprises a test soil sample chamber, a uniform variable speed sewage supply module, a water supply module and a solution collection module, wherein the test soil sample chamber at least comprises a first sand tank, a second sand tank and an engineering barrier isolation tank which are arranged in sequence and provided with a water permeable structure therebetween; and the uniform variable speed sewage supply module is communicated with the first sand tank, the water supply module is communicated with the bottom end of the first sand tank, and the solution collection module is arranged at the bottom ends of the engineering barrier isolation tank andthe second sand tank. According to the scheme, the migration and diffusion of non-aqueous phase liquid pollutants in the stratum can be simulated according to different geological conditions and different working conditions on site; the migration and distribution characteristics of the non-aqueous phase pollutants in porous media with different particle sizes are studied; and meanwhile, the isolation, resistance and control effects of an engineering barrier isolation wall on pollution plumes generated after migration and diffusion of the non-aqueous phase liquid pollutants in an underground environment can be systematically studied.

Description

technical field [0001] The invention relates to the technical fields of geological engineering and civil engineering (rock and soil), in particular to a system and method for testing the migration and barrier of non-aqueous liquid pollutants in groundwater. Background technique [0002] Due to leakage of landfill leachate, leakage of petroleum products in underground oil storage facilities and oil pipelines, the pollution of organic solvents and other petroleum products to soil and groundwater is becoming more and more serious. The soil contaminated by petroleum organic matter contains a variety of toxic substances, which will cause serious harm to organisms after entering the groundwater environment. Most organic pollutants are immiscible with water (may be partially soluble in water, at this time the dissolved phase and non-aqueous phase exist at the same time), such liquids are usually called non-aqueous phase liquids (Nonaqueous Phase Liquids, NAPLs), including Large he...

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Problems solved by technology

However, at present, the research on the mechanism of oil displacement and migration in the vadose zone is not deep enough, and there is a lack of systematic research on the migration and diffusion process of non-aqueous liquid pollutants under the multi-field coupling, so it is still difficult to establish a practical mathematical model to describe Migration and Transformation Laws of Petroleum Pollutants in Multiphase Flow System

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