Landfill dominant flow testing device and method based on tracer migration

Abstract

The invention discloses a landfill dominant flow testing device and method based on tracer migration. The device mainly comprises a pressurized water supply device, a landfill column convection-diffusion device, a sampling device and a loading device, wherein the pressurized water supply device comprises a pressurizer and is used for controlling injection pressure so as to simulate migration of a tracer agent in the landfill body under different water heads; the landfill column convection-diffusion device is used for simulating a dominant flow migration phenomenon of the tracer agent in a landfill; the loading device is used for controlling overburden pressure applied to the garbage; and the sampling device is used for sampling tracer solutions at different points in the landfill column convection-diffusion device. According to the dominant flow determination method, the characteristic of high heterogeneity of the saturated landfill body is mainly considered, a dual-medium non-uniform flow migration mathematical model of the tracer agent in the saturated landfill body is established, and parameters such as the fracture void ratio representing the dominant flow are obtained through the experimental result of reversely demonstrating the concentration distribution of the tracer agent.

Description

technical field [0001] The invention belongs to the field of fluid migration simulation experiment methods and devices in municipal solid waste landfills, and in particular relates to a landfill dominant flow test device and method based on tracer migration, which can simulate the actual situation of landfills under a certain water head And measured the relevant parameters of liquid phase tracer migration. [0002] technical background [0003] There are more than 1,600 urban solid waste sanitary landfills and more than 20,000 simple landfills in China, which generally have the risk of leachate leakage and polluting soil and groundwater, which seriously threatens urban environmental safety. The identified pollutants in landfill sites include organic matter, inorganic salts, and heavy metals. The meteorological, topographical, and hydrogeological conditions of landfill sites are different, resulting in huge challenges in the prevention and control of landfill pollution. [00...

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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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