Simulation device and application method for the migration of groundwater pollutants under the condition of leakage

Abstract

The invention discloses an underground water contaminant movement simulation device on the transfluence condition and a using method, and belongs to the technical field of underground water contamination simulation instrument equipment. The underground water contaminant movement simulation device comprises a pressure supply unit, a water supply unit, an earth pillar unit and a sample receiving unit. The pressure supply unit comprises a pressure air cylinder, and a pressure reducing valve is arranged at an outlet of the pressure air cylinder. The water supply unit comprises a closed organic glass pillar I capable of bearing pressure. The earth pillar unit comprises an organic glass pillar II capable of bearing pressure. A simulated earth pillar is arranged inside the organic glass pillar II. The top and the bottom of the simulated earth pillar are water-bearing layer settlings, and the middle of the simulated earth pillar is weak water permeable layer settling media. The sample receiving unit comprises a water stabilizing tank and a sampler with scale marks. The pressure reducing valve, the organic glass pillar I and the organic glass pillar II are sequentially connected through guiding pipes. The organic glass pillar II, the water stabilizing tank and the sampler are sequentially communicated through guiding pipes. The high water head difference supplied by underground water transfluence and the reducing environment of the weak water permeable layer are provided, the transfluence water head difference is 0-15 cm, operation is easy, adjustment is convenient, and test data is more accurate and reliable.

Description

technical field [0001] The invention relates to the technical field of groundwater pollution simulation instruments and equipment. Background technique [0002] With the acceleration of industrialization and urbanization, the pollution of surface water and groundwater is increasing. The mining intensity of shallow groundwater decreases due to the deterioration of water quality, and the mining intensity of deep groundwater increases continuously due to better water quality; the head of shallow and deep groundwater continues to increase, which in turn makes the polluted shallow groundwater flow over to replenish deep water, resulting in deep groundwater Water quality deteriorated. [0003] The aquitard is the link between the shallow layer and the deep layer aquifer, and it functions to conduct water pressure and transport solute components. The aquitard medium has small particles and many micropores, and groundwater mainly exists in the form of bound water, often in a weakl...

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Problems solved by technology

[0004] Previous studies have shown that the current soil column model has the following defects: First, most of the soil column devices used at this stage are designed for unsaturated or low-pressure hydraulic conditions, which cannot simulate the discharge of pollutants under the condition of groundwater overflow. Second, the only few high-pressure soil columns did not consider the chemical environment. For example, the groundwater in the aquitard is mostly in a reducing environment. If a booster pump is used to increase the pressure, an oxidizing environment will be generated and lead to oxidation-reduction The migration and transformation of sensitive pollutants (such as NH4+, SO42-, etc.) in the aquitard is contrary to the actual situation underground

None of the current devices can realize the experimental simulation of chemical field-physical field coupling, but can only conduct experimental simulation for a single field (only considering pressure and water chemistry)

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