Waste landfill evapotraspiration covering layer based on municipal dehydrated sludge

A landfill and dewatered sludge technology, which is applied in landfill technology, infrastructure engineering, solid waste removal, etc., can solve the problems of cumbersome construction of composite covering layers and inconvenient materials, and achieve economic benefits and environmental protection The effect of double harvest, material and structure optimization

Active Publication Date: 2018-07-13
INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a waste landfill covering layer based on municipal dewatered sludge, which solves or partially solves the engineering problems of cumbersome construction and inconvenient materials for the composite covering layer in the prior art and general waste covering laye

Method used

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  • Waste landfill evapotraspiration covering layer based on municipal dehydrated sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Municipal dewatered sludge with a moisture content of 80% is selected, and it is prepared for use after being screened for impurities and heavy metals.

[0045] 1. Preparation of foundation cushion layer 5

[0046] The construction waste is piled on the top of the waste pile first, and mechanically crushed in situ. After crushing, the largest particle size of the block is less than 5cm, and then leveled, and the final thickness is 12cm.

[0047] 2. Preparation of adjustment layer 4

[0048] Take 1000kg of municipal dewatered sludge, add 120kg of modified agent I, mix well, and use a sludge granulator to extrude into spherical particles with a particle size range of 0.75-2mm, and place the spherical particles in a cool and ventilated environment for natural maintenance Drying, curing for 7 days, the permeability coefficient of the test sludge heap is

[0049] 2.3×10 -3 m / s, and then stack the materials on the foundation cushion layer 5, lightly compact and level it, and...

Embodiment 2

[0058] Municipal dewatered sludge with a moisture content of 83% is selected, and is ready for use after screening for impurities and heavy metals.

[0059] 1. Preparation of foundation cushion layer 5

[0060] The construction waste is piled on top of the waste pile first, and mechanically crushed in situ. After crushing, the largest particle size of the block is less than 6cm, and then leveled, and the final thickness is 15cm.

[0061] 2. Preparation of adjustment layer 4

[0062] Take 1000kg of municipal dewatered sludge, add 150kg of modified agent I, mix well, and use a sludge granulator to extrude into spherical particles with a particle size range of 0.75-2mm, and place the spherical particles in a cool and ventilated environment for natural maintenance Drying, curing for 8 days, the permeability coefficient of the test sludge heap is

[0063] 3.5×10 -3 m / s, and then stack the materials on the foundation cushion layer 5, lightly compact and level it, and finally lay ...

Embodiment 3

[0072] Municipal dewatered sludge with a moisture content of 85% is selected, and is ready for use after screening for impurities and heavy metals.

[0073] 1. Preparation of foundation cushion layer 5

[0074] The construction waste is piled on the top of the waste pile first, and mechanically crushed in situ. After crushing, the largest particle size of the block is less than 6cm, and then leveled, and the final thickness is 18cm.

[0075] 2. Preparation of adjustment layer 4

[0076] Take 1000kg of municipal dewatered sludge, add 180kg of modified agent I, stir evenly, and use a sludge granulator to extrude into spherical particles with a particle size range of 0.75-2mm, and place the spherical particles in a cool and ventilated environment for natural maintenance Drying, curing for 10 days, the permeability coefficient of the test sludge heap is

[0077] 1.7×10 -3 m / s, and then stack the materials on the foundation cushion layer 5, lightly compact and level it, and fina...

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Abstract

The invention relates to a waste landfill evapotraspiration covering layer based on municipal dehydrated sludge. The waste landfill evapotraspiration covering layer comprises a foundation bed, an adjusting layer, a water storage layer and a vegetation layer. The foundation bed is obtained through the method that building waste is crushed mechanically in situ and flattened; the adjusting layer is obtained through the method that after first modified agents are added in the municipal dehydrated sludge after dehydrating, the municipal dehydrated sludge and the first modified agents are stirred evenly and then extruded into spherical particles, and the spherical particles are placed in a cool ventilating environment to be naturally cured and dried; the water storage layer is obtained through the method that after second modified agents and synthetic fibers are added in the municipal dehydrated sludge, the municipal dehydrated sludge, the second modified agents and the synthetic fibers arestirred evenly; and the vegetation layer is formed through the method that evergreen herbaceous plant seeds are sewed on the surface of the water storage layer, and shrubs or shrub woody plants are planted. According to the waste landfill evapotraspiration covering layer based on municipal dehydrated sludge, materials and the structure of the evapotraspiration covering layer are optimized, resource utilization of the sludge is achieved, and double harvesting of economic benefits and environment benefits is achieved.

Description

technical field [0001] The invention relates to the technical field of environmental geotechnical engineering, in particular to a waste landfill covering layer based on municipal dewatered sludge. Background technique [0002] In order to ensure landfill sanitation and reduce environmental hazards, landfills need to be closed and covered after the landfill is completed. Generally, the composite closure covering structure includes four layers, which are in order from bottom to top: air-conducting layer, anti-seepage layer, drainage layer, and vegetation nutrient soil layer. Although this kind of covering structure has a good anti-seepage effect, the structure is relatively complex, the construction is inconvenient, and the performance requirements of the covering materials are high. Not all landfill sites can easily meet the material requirements, and the cost is huge. In addition, the interlayer interfaces of multilayer structures are mostly weak surfaces, which are prone t...

Claims

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Application Information

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IPC IPC(8): B09B1/00E02D31/00
CPCB09B1/004E02D31/006Y02W30/30
Inventor 薛强何星星陈亿军万勇刘磊谭洵
Owner INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI
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