A device and method for testing landfill dominant flow based on tracer migration

Abstract

The invention discloses a device and method for testing the dominant flow of a landfill body based on tracer migration. The device mainly includes pressurized water supply, landfill column convection-diffusion, sampling and loading devices. The pressurized water supply device contains a pressurizer, which is used to control the injection pressure to simulate the migration of the tracer in the landfill under different water heads; the landfill column convection-diffusion device is used to simulate the tracer in the landfill. The dominant flow migration phenomenon in the field; the loading device is used to control the overlying pressure applied to the garbage; the sampling device is used to sample the tracer solution at different points in the landfill column convection-diffusion device; the method for determining the dominant flow is mainly Considering the characteristics of strong heterogeneity in saturated landfill waste, a mathematical model for the migration of tracer in a dual-medium non-uniform flow is established, and the cracks that characterize the dominant flow are obtained by reversing the experimental results of tracer concentration distribution Parameters such as void ratio.

Description

technical field [0001] The invention belongs to the field of fluid migration simulation experiment methods and devices in urban domestic waste landfills, and in particular relates to a landfill dominant flow testing device and method based on tracer migration, which can simulate the actual situation of landfills under a certain water head And the related parameters of the liquid phase tracer migration were measured. [0002] technical background [0003] More than 1,600 municipal solid waste sanitary landfills and more than 20,000 simple landfills in China generally have the risk of leachate leakage contaminating soil and groundwater, which seriously threatens the safety of the urban environment. The identified pollutants at the landfill site include five categories of organic matter, inorganic salts, and heavy metals. The meteorological, topographic and hydrogeological conditions of the landfill site are different, resulting in huge challenges in the prevention and control o...

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Problems solved by technology

However, a large number of in-situ experiments and engineering applications show that there is a large error between the simulation results of the single-pore model and the measured data.

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