Impermeable clay liner at bottom of refuse landfill and application thereof

A landfill and clay technology, applied in the field of clay cushion and impermeable clay cushion, can solve the problems of complex composition and underground environment pollution, and achieve the effect of blocking infiltration

Active Publication Date: 2015-10-07
HOHAI UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

[0003] As the garbage in the landfill continues to degrade over time, a large number of high-concentration and complex-composition pollutants wil

Method used

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  • Impermeable clay liner at bottom of refuse landfill and application thereof

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Embodiment 1

[0029] This embodiment provides an impermeable clay cushion at the bottom of a landfill site, which is formed by mixing kaolinite clay and illite clay with an appropriate amount of water, stirring evenly, and compacting. Kaolinite clay is mainly kaolinite clay. The specific mineral components are: 71wt% kaolinite, 7wt% illite, 6wt% montmorillonite and 16wt% quartz. The clay is dried, crushed and screened. Particles with a particle size of less than 1 mm were obtained (the optimal moisture content of the clay was measured to be 19.70 wt%). Illite clay is mainly illite clay. The specific mineral components are: 11wt% kaolinite, 58wt% illite, 12wt% montmorillonite and 19wt% quartz. Particles with a diameter of less than 1mm (the optimal moisture content of the clay is measured to be 18.80wt%). Mix kaolinite clay and illite clay according to different mass ratios (define the mass of illite clay as a percentage of the total amount of kaolinite clay and illite clay as Y), and the s...

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Abstract

The invention relates to an impermeable clay liner at the bottom of a refuse landfill and application thereof. The clay liner is formed by mixing kaolinite clay, illite clay and water and then crushing the mixture, and the porosity is smaller than or equal to 40 percent; the percentage of the mass of the kallinite clay accounting for the total mass of the kallinite clay and the illite clay is denoted as X, wherein 10%<=X<70%; the percentage of the mass of the illite clay accounting for the total mass of the kallinite clay and the illite clay is denoted as Y, wherein 30%<Y<=90%. By seriously controlling the porosity of the clay liner and the proportion of the kaolinite clay and the illite clay, the unexpected effect that a start hydraulic gradient (i0) starts to occur in the clay liner is generated, and therefore permeation of pollutant leachate can be stopped.

Description

technical field [0001] The invention belongs to the field of landfill anti-seepage, and relates to a clay cushion, in particular to an impermeable clay cushion at the bottom of a garbage landfill and an application thereof. Background technique [0002] my country is a country with a large population, but also a country with a large garbage output. At present, there are three commonly used waste disposal methods, incineration, landfill and composting. Among various disposal methods, sanitary landfill is widely used because of its advantages of safety and sanitation, large disposal capacity and high efficiency. More than 80% of domestic waste in my country is disposed of by landfill, and more and more waste is landfilled. field is built. [0003] As the waste in landfill degrades over time, a large number of pollutants with high concentration and complex composition will be produced. These pollutants can pass through the cushion layer through convection and diffusion, there...

Claims

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Application Information

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IPC IPC(8): E02D31/00
Inventor 朱伟王升位舒实徐浩青范惜辉邵燕华
Owner HOHAI UNIV
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