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Double-layer clay liner for preventing seepage and resisting compression at bottom of refuse landfill

A landfill and clay technology, applied in layered products, natural mineral layered products, infrastructure engineering, etc., can solve the problems of blocking heavy metal ions and volatile organic compounds, polluting groundwater, etc., to protect groundwater, reduce Settling and compressibility reduction effect

Inactive Publication Date: 2013-03-13
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The traditional single-layer clay liner can meet the relevant national requirements in terms of permeability coefficient, but many heavy metal ions and volatile organic compounds penetrate the clay liner to pollute groundwater through long-term diffusion, and the single-layer clay liner cannot effectively block heavy metals Transport of ions and VOCs

Method used

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  • Double-layer clay liner for preventing seepage and resisting compression at bottom of refuse landfill
  • Double-layer clay liner for preventing seepage and resisting compression at bottom of refuse landfill
  • Double-layer clay liner for preventing seepage and resisting compression at bottom of refuse landfill

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Experimental program
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Embodiment

[0015] The clay used in this experiment was taken from a landfill, and was dried, crushed, and screened to obtain particles with a particle size of less than 1 mm. The optimal water content of the clay was determined to be 18.8%. Take part of the clay and add water accounting for 22% of the dry ingredients, mix and stir evenly, and prepare a single-layer clay liner with a thickness of 8cm through ordinary compaction.

[0016] The preparation of the upper layer of clay liner is to mix 90% by mass of clay and 10% of lime evenly. The optimal water content of the measuring point is 25.2% by using the compaction test method. Add water accounting for 28.2% of the mass of dry ingredients and mix well. , formed by ordinary compaction, the thickness of the upper clay liner is 4cm. The preparation of the lower layer of clay liner is to mix 94% clay and 6% granular activated carbon powder evenly by mass percentage, and use the compaction test method to determine the optimal water content...

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Abstract

The invention discloses a double-layer clay liner for preventing seepage and resisting compression at the bottom of a refuse landfill. The double-layer clay liner comprises an upper clay liner and a lower clay liner which are arranged in sequence from top to bottom, wherein the upper clay liner is obtained by adding a proper amount of water to clays and limes, uniformly mixing and stirring an obtained mixture and compacting the mixture; and the lower clay liner is obtained by adding a proper amount of water to clays and active carbons, uniformly mixing and stirring an obtained mixture and compacting the mixture. The double-layer clay liner for preventing seepage and resisting compression at the bottom of the refuse landfill, disclosed by the invention, has the advantages as follows: higher compressive strength is obtained; the sedimentation of the refuse landfill is reduced; meanwhile, the double-layer clay liner obtains very strong adsorbing capacity to pollutants in a penetrating fluid of the refuse landfill; the seepage speed of the refuse leachate is reduced; the diffusion effects of the pollutants in the clay transferring process are reduced; and the underground water is more effectively protected.

Description

[0001] Technical field [0002] The present invention is the field of garbage landfill treatment technology, and especially involves double -layer clay pads used for the bottom of the landfill. Background technique [0003] my country is a large population country, and it is also a large country for garbage production.There are three commonly used garbage treatment methods, incineration, landfill and compost.In various disposal methods, hygiene landfills are widely adopted due to the advantages of its safety, hygiene, large disposal, and high efficiency. More than 80%of my country's domestic waste uses landfill disposal. The field was built.The key technology for building waste landfills is the anti -seepage treatment at the bottom to prevent a large number of toxic and harmful organic pollutants (heavy metals such as mercury, lead) and organic pollutants (COD, BOD, Phenol, etc.) polluting landfill around the filtration fluid.Environment and groundwater.There are two main types o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D31/00B32B19/00
Inventor 李轶陈云霄陈海蓉张文龙王晴
Owner HOHAI UNIV
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