Covering layer of sanitary landfill

A covering layer and landfill technology, which is applied to the component fields of garbage sanitary landfills, can solve the problems that garbage incineration ash and sewage sludge have not been effectively disposed of, land resources are tight, and soil prices are high. Achieve the effect of high strength, reduced permeability and low anti-seepage coefficient

Inactive Publication Date: 2012-01-18
福建优建建筑科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, cohesive soil is used to cover garbage, that is, a single cohesive soil is used as a covering layer. The main problem is that it is difficult to have a large amount of cohesive soil as a covering layer in some areas, especially in developed areas where land resources are scarce. The price of soil is higher
In addition, the waste incineration ash and sewage sludge produced by waste incineration have not been effectively disposed of.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] First take a proper amount of garbage incineration ash, and use magnetic separation equipment to remove the metals in the garbage incineration ash. The removed metals can be recycled, and then use a crusher to crush and screen the garbage incineration ash after metal removal, so that The particle size of the screened ash particles is less than 0.5cm, and then the part of the ash is sprayed and sterilized with an aqueous solution of organic chloride to obtain the pretreated waste incineration ash; the raw sludge is passed through the dehydration equipment Simple dehydration is performed to obtain native dewatered sludge; in addition, the cohesive soil is pulverized, and then crushed cohesive soil with a particle size greater than 0.5 cm is removed to obtain pretreated cohesive soil.

[0020] According to the weight ratio, take 1 part of the pretreated waste incineration ash, 1 part of the pretreated cohesive soil, and 2 parts of the original dewatered sludge, mix and stir...

Embodiment 2

[0022] Carry out the pretreatment operation consistent with embodiment one to garbage incineration ash, sludge and cohesive soil equally, then according to weight ratio, get 1 part of pretreated garbage incineration ash, 1 part of pretreated cohesive soil, and 1 part of the original dewatered sludge were mixed and stirred evenly, and then it was laid as a covering layer on the corresponding position of the landfill and compacted, and the penetration test and unconfined compressive strength test were carried out on the covering layer, and the measured The permeability coefficient is 5.3×10 -8 cm / s, less than 1.0×10 stipulated in "Technical Specifications for Domestic Garbage Sanitary Landfill" (CJJ17-2004) -7 cm / s, and its unconfined compressive strength measured at 28 days is 9.3MPa, while the unconfined compressive strength of the common clay covering layer is generally located at 0.06-0.1MPa at present, that is, the covering layer strength of the present invention is much gr...

Embodiment 3

[0024] Carry out the pretreatment operation consistent with embodiment one to garbage incineration ash, sludge and cohesive soil equally, then according to weight ratio, get 3 parts of pretreated garbage incineration ash, 4 parts of pretreated cohesive soil, and 6 parts of original dewatered sludge were mixed and stirred evenly, and then it was laid as a covering layer at the corresponding position of the landfill and compacted, and the penetration test and unconfined compressive strength test were carried out on the covering layer, and the measured The permeability coefficient is 1.3×10 -8 cm / s, less than 1.0×10 stipulated in "Technical Specifications for Domestic Garbage Sanitary Landfill" (CJJ17-2004) -7 cm / s, and its unconfined compressive strength measured at 28 days is 3.5MPa, while the unconfined compressive strength of the common clay covering layer is generally located at 0.06-0.1MPa at present, that is, the covering layer strength of the present invention is much gre...

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PUM

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Abstract

The invention provides a covering layer of a sanitary landfill. The covering layer is formed by uniformly mixing and stirring three component materials consisting of 1-3 parts by weight of pre-treated garbage incinerated ash residues, 1-4 parts by weight of pre-treated sludge and 1-6 parts by weight of pre-treated cohesive soil. The covering layer of the sanitary landfill disclosed by the invention not only has lower anti-seepage coefficient but also provides a way for effectively disposing the garbage incinerated ash residues, sewage and the sludge while reducing the use amount of the cohesive soil.

Description

【Technical field】 [0001] The invention relates to a component part of a garbage sanitary landfill, in particular to a covering layer of a garbage sanitary landfill. 【Background technique】 [0002] With the increase of my country's urban population and the improvement of people's living standards, cities produce more and more domestic waste every year. It is reported that my country's urban domestic waste is increasing at a rate of 7%-10% per year. A large amount of domestic waste needs to be disposed of. Among various disposal methods, sanitary landfill has the 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. In the garbage sanitary landfill, the compacted garbage should be covered. On the one hand, it is to prevent rainwater from invading the garbage, so as not to increase the output of garbage leachate. On the other hand, it can prevent the breeding of mosquitoes and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00B09B1/00
Inventor 罗才松陈华艳蔡雪峰毕贤顺
Owner 福建优建建筑科技有限公司
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