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A method for covering sanitary landfill of domestic waste in loess area

A technology for domestic waste and loess areas, which is applied in landfill technology, chemical instruments and methods, and solid waste removal. and stability, enhanced microbial activity, and increased organic matter content

Active Publication Date: 2022-05-27
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, domestic garbage sanitary landfills mainly use HDPE film covering and earthwork covering for daily and intermediate covering. Although HDPE film covering can effectively prevent light garbage from scattering, reduce the breeding of mosquitoes and flies, and achieve rain and sewage diversion to a certain extent, HDPE film covering The capital investment is high, and the HDPE film is easy to age and damage under strong sunlight, and the problems of landfill gas and odor cannot be solved. In addition, in the northwestern region where earthwork is abundant, the use of HDPE film will also cause landfill construction. There is nowhere to place excess earth, resulting in waste of resources
Directly use the native loess in Northwest China to cover the domestic waste landfill. On the one hand, the native loess has low water content and fine sand particles, and its covering strength for landfill waste is low. It is easy to generate dust in sunny and windy weather. Weather can easily lead to soil erosion on slopes; on the other hand, the permeability coefficient of native loess is 6.0×10 -4 cm / s, the field water holding capacity is about 23%, its water holding capacity and anti-seepage effect are poor, and it is easy to increase the landfill leachate production in rainy weather; in addition, the biological activity of primary loess is extremely low, which is not suitable for landfill gas and odor. The degradation effect of gas is also not good

Method used

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  • A method for covering sanitary landfill of domestic waste in loess area
  • A method for covering sanitary landfill of domestic waste in loess area
  • A method for covering sanitary landfill of domestic waste in loess area

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Experimental Group 1:

[0025]Dump the loess in the landfill 6 surface, use a bulldozer to pave the loess flat and compact, form a layer of closed and uniform loess daily cover layer 5 with a thickness of 0.5m, and then plow out the shallow ditch 7 on the surface of the loess cover layer, the section of the shallow ditch 7 is inverted triangle, the bottom depth of the ditch is 0.1m, the spacing of the ditch is 0.3m, the leachate generated by the landfill garbage is laid in the anti-seepage layer 1 under the landfill, the leachate pipe 2 enters the reservoir 3, and the storage is stable to the B / of the leachate by the storage tank 3. C less than 1, the reuse of lifting pump 4 to raise the leachate in the reservoir 3 into the irrigation pipe and sprinkler irrigation to the surface of the loess cover 5.

[0026] The local minimum temperature in the area of the domestic garbage landfill in the present embodiment is about 25 ° C, so the surface load of leachate sprinkler irriga...

Embodiment 2

[0038] Experimental group 2:

[0039] Dump the loess into the surface of the landfill 6, use a bulldozer to pave the loess flat and compact, form a layer of closed and uniform loess daily cover layer 5 with a thickness of 0.4m, and then plow out the shallow ditch 7 on the surface of the loess cover layer, the section of the shallow ditch 7 is inverted triangle, the bottom depth of the ditch is 0.15m, the spacing of the ditch is 0.4m, the leachate generated by the landfill garbage is laid in the anti-seepage layer 1 under the landfill, and the leachate pipe 2 enters the reservoir 3, and is stabilized to the B / of the leachate by the storage tank 3. C less than 1, the reuse of lifting pump 4 to raise the leachate in the reservoir 3 into the irrigation pipe and sprinkler irrigation to the surface of the loess cover 5.

[0040] The local minimum temperature in the area of the domestic garbage landfill in the present embodiment is about 10 ° C, so the surface load of leachate sprinkler...

Embodiment 3

[0052] Experimental group 3:

[0053] Dump the loess into the surface of the landfill 6 in the domestic garbage landfill, pave the loess with a bulldozer to flatten and compact, form a layer of dense and uniform loess middle cover layer 5 with a thickness of 0 .8m, and then plow out the shallow ditch 7 on the surface of the overburden layer, the cross-section of the shallow ditch 7 is inverted triangle, the bottom depth of the ditch is 0.2m, the spacing between the ditches is 0.4m, and the leachate generated by the landfill garbage is laid in the anti-seepage layer 1 under the landfill, and the leachate pipe 2 enters the reservoir 3, and is stabilized to the B / of the leachate by the storage tank 3. C less than 1, the reuse of lifting pump 4 to raise the leachate in the reservoir 3 into the irrigation pipe and sprinkler irrigation to the surface of the loess cover 5.

[0054] The local minimum temperature in the loess area of the domestic waste landfill in the present embodiment i...

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Abstract

The invention discloses a sanitary landfill covering method for domestic garbage in loess areas, belonging to the technical field of garbage landfill. The steps of the method are as follows: covering the landfill garbage in the domestic waste landfill with loess to form a loess covering layer, then plowing shallow furrows on the surface of the loess covering layer, and when the lowest temperature in the area is not lower than 5°C, the landfill Landfill leachate is irrigated to the surface of the loess overburden by sprinkling water. The method of the invention is easy to operate, not only can effectively utilize local loess and landfill leachate with sufficient amount of earthwork, save land resources, reduce the treatment amount of leachate, but also can effectively improve the strength and organic matter content of the covering layer, and avoid dust caused by loess covering While solving the problem of water and soil loss, it can enhance the water holding capacity of the loess cover layer and improve its anti-seepage ability. In addition, it can also biodegrade the landfill gas generated by landfilling garbage, and the degradation effect is good.

Description

Technical field [0001] The present invention relates specifically to a sanitary landfill covering method for domestic garbage in loess areas, belonging to the field of landfill technology. Background [0002] Sanitary landfill is one of the mainstream technologies for the treatment of mixed collection of domestic waste because of its excellent economic benefits. With the continuous improvement of China's economic level and residents' living standards, the output of domestic waste has increased year by year, and at the same time, more and more attention has been paid to environmental protection, and then the requirements for the scale and quality of sanitary landfills have also increased accordingly. According to the requirements of the Ministry of Housing and Urban-Rural Development of the People's Republic of China, the Technical Specifications for the Sanitary Landfill Treatment of Domestic Waste (GB50869-2013) and the Technical Regulations for the Operation and Maintenance of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B1/00B09B3/60B09B101/25
CPCB09B1/004B09B3/00Y02W30/30
Inventor 何品晶邵立明陈俊岚吕凡章骅彭伟
Owner TONGJI UNIV
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