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Novel rubbish landfill yard anti-seepage material

A landfill and anti-seepage material technology, which is applied in the field of new anti-seepage materials, can solve problems such as poor puncture resistance, geomembrane damage, and damage to the surrounding environment, and achieve construction quality assurance, simple construction, and reduced energy consumption. cost effect

Inactive Publication Date: 2009-06-17
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the waste left after nuclear power generation has relatively strong radioactivity, which seriously damages the surrounding environment
[0003] In the landfill anti-seepage system, the anti-seepage materials commonly used at home and abroad are geomembranes such as high-density polyethylene. Although the anti-seepage performance of this material is very good, due to its relatively thin thickness, it is generally 1.5-2.0mm. Therefore, the puncture resistance is poor
In addition, my country's garbage has not yet been classified and collected, and the composition of the garbage is quite complex. Whether it is domestic garbage or the residue after incineration, it contains sharp objects such as iron, glass, ceramics, etc. With the increase of landfill height, the impact on The load on the geomembrane increases, the geomembrane is punctured and damaged, and the leachate flows into the ground to pollute the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Bentonite is American super clay sodium bentonite; the particle density of semi-rigid material is 2.67g / cm 3 , the maximum dry density is 2.03g / cm 3 , the maximum particle size is 25mm, of which 33% are particles with a diameter less than 1mm; the water used is ordinary tap water.

[0021] (1) the optimal water content of the mixed soil recorded is 15.1%, and the expansion rate of bentonite is 5.3 times;

[0022] (2) According to the principle that the pores of the mixed soil are zero, the calculated bentonite dosage is 6.8% of the semi-rigid material;

[0023] (3) Add 15.1% water in sequence to the semi-rigid material, and stir for 2 minutes; add 6.8% bentonite after stirring evenly, and stir for 2 minutes;

[0024] (4) Shaping after stirring, the paving thickness is 50cm, rolled back and forth 5 times, and the compactness is 91%. The permeability coefficient measured by sampling is 2.3*10 -7 cm / s.

Embodiment 2

[0026] Bentonite is made in China; the particle density of the semi-rigid material is 2.66g / cm 3 , the maximum dry density is 1.83g / cm 3 , the maximum particle size is 20mm, of which 23% are particles with a diameter of less than 1mm; the water used is ordinary tap water.

[0027] (1) The optimal moisture content of the mixed soil recorded is 13.1%, and the expansion ratio of bentonite is 3.8 times;

[0028] (2) According to the principle that the void ratio is zero, the bentonite dosage is calculated to be 16.2% of the semi-rigid material;

[0029] (3) Add 13.1% water successively to the semi-rigid material, stir for 2 minutes; add 16.2% bentonite after stirring evenly, and stir for 3 minutes;

[0030] (4) Shaping after stirring, the paving thickness is 47.5cm, rolled back and forth 6 times, and the compactness is 92%. The permeability coefficient measured by sampling is 8.8*10 -8 cm / s.

Embodiment 3

[0032] Bentonite is made in the United States; the particle density of the semi-rigid material is 2.70g / cm 3 , maximum dry density 1.95g / cm 3 , the maximum particle size is 20mm, of which 28% are particles with a diameter less than 1mm; the water used is ordinary tap water.

[0033] (1) The optimum water content of the mixed soil recorded is 13.7%, and the expansion rate of bentonite is 6.1 times;

[0034] (2) According to the principle that the void ratio is zero, the bentonite dosage is calculated to be 7.9% of the semi-rigid material;

[0035] (3) Add 13.7% water successively to the semi-rigid material, and stir for 3 minutes; add 7.9% bentonite after stirring evenly, and stir for 2 minutes;

[0036] (4) Shaping after stirring, the paving thickness is 42.0cm, rolled back and forth 7 times, and the compactness is 91%. The permeability coefficient measured by sampling is 1.1*10 -7 cm / s.

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Abstract

The invention discloses an impermeable material for a refuse landfill, which is prepared by stirring, paving and rolling a raw material. The thickness of the impermeable material for the refuse landfill is 30 to 50 centimeters, the compactness of the impermeable material for the refuse landfill is more than 90 percent, and the raw material consists of the following components by mass percentage: 60 to 80 percent of semi-rigid material, 3 to 20 percent of bentonite, and 10 to 20 percent of water. Compared with the prior art, the impermeable material for the refuse landfill has the advantages of good impermeable effect, strong anti-puncturing capability, low preparation energy consumption and cost, and simple and convenient construction.

Description

(1) Technical field [0001] The invention relates to a novel anti-seepage material applied to landfills, and belongs to the technical field of civil engineering materials. (2) Background technology [0002] With the improvement of living standards, the amount of waste discharged by urban residents in my country has increased year by year, and the average discharge of domestic and office waste is about 1 kg per person per day. The waste collected through the urban sanitation system, except for a small amount, is recycled and used as fertilizer In addition, about 70% of the volume will be transported to landfill. Since the garbage contains harmful substances such as heavy metals, the leachate in the garbage must be isolated from the groundwater system, so as not to pollute the groundwater and cause pollution to the environment. In addition, the waste left after nuclear power generation has relatively strong radioactivity, which seriously damages the surrounding environment. ...

Claims

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Application Information

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IPC IPC(8): C04B14/12C04B14/04
Inventor 许四法杨杨
Owner ZHEJIANG UNIV OF TECH
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