Preparation and application of municipal dewatering sludge based coating material for seal of landfill site

A landfill and dewatered sludge technology, which is applied in landfill technology, water/sludge/sewage treatment, sludge treatment, etc., can solve the problem of large amount of landfill construction, difficulty in project quality assurance, Difficulty in obtaining materials and other issues, to achieve the effect of preventing rainfall erosion, simple construction method, and strong operability

Active Publication Date: 2012-09-26
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

The amount of materials such as clay, sand and pebbles required to build a standard landfill is quite large. In many areas of the country, natural clay, pebbles, sand and other resources are not available, and these materials are difficult to obtain, and transportation costs High; resulting in a large amount of construction in the landfill, slow construction speed, and difficult to guarantee the quality of the project

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0025] ① Preparation of exhaust layer covering material,

[0026] Take municipal dewatered sludge with a moisture content of 80% to 85%, mix it with a curing agent of 3% to 5% by weight of municipal dewatered sludge, stir evenly, extrude into spherical particles with a particle diameter of 5 to 20mm, and put The spherical particles are placed in a cool and ventilated place to dry naturally, and the curing agent is one of Portland cement, slag Portland cement or composite Portland cement.

[0027] ②Preparation of impermeable layer covering material,

[0028] Take municipal dewatered sludge with a moisture content of 80% to 85%, mix it with 3% to 5% gelling solidification material according to the weight ratio of municipal dewatered sludge, and mix it with 0.5% to 1% according to the weight ratio of municipal dewatered sludge The flocculent fibers are stirred evenly. The gelling and solidifying material is one of rapid hardening Portland cement or low-heat slag Portland cement,...

specific Embodiment 1

[0037] ① Preparation of exhaust layer covering material,

[0038] Take 1000kg of municipal dewatered sludge with a moisture content of 83%, mix it with 30kg of Portland cement, stir it evenly in a mixer, and then use a sludge granulator to extrude it into spherical particles with a particle diameter of 5-20mm, and place the spherical particles Dry naturally in a cool and ventilated place.

[0039] ②Preparation of impermeable layer covering material,

[0040] Take 1500kg of municipal dewatered sludge with a water content of 83%, mix it with 45kg of rapid-hardening Portland cement, and mix it with 7.5kg of flocculent fibers with a fiber length of 1-2mm, and stir evenly in a mixer.

[0041] ③ preparation of vegetation vegetative layer covering material,

[0042] Take 1000kg of municipal dewatered sludge with a moisture content of 83%, mix it with 8kg of ordinary Portland cement, mix it with 10kg of sludge deodorant, and stir it evenly in a mixer.

[0043] The specific operatio...

specific Embodiment 2

[0050] ① Preparation of exhaust layer covering material,

[0051] Take 1000kg of municipal dewatered sludge with a moisture content of 83%, mix it with 50kg of slag Portland cement, stir it evenly in a mixer, and then use a sludge granulator to extrude it into spherical particles with a particle diameter of 5-20mm. Place in a cool and ventilated place to dry naturally.

[0052] ②Preparation of impermeable layer covering material,

[0053] Take 1500kg of municipal dewatered sludge with a water content of 83%, mix it with 75kg of low-heat slag portland cement, and mix it with 15kg of flocculent fibers with a fiber length of 1-2mm, stir it evenly in a mixer, and set it aside.

[0054] ③ preparation of vegetation vegetative layer covering material,

[0055] Take 1000kg of municipal dewatered sludge with a moisture content of 83%, mix it with 10kg of ordinary portland cement, and mix it with 30kg of sludge deodorant, stir it evenly in a mixer, and set it aside.

[0056] The spec...

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Abstract

The present invention relates to preparation of a municipal dewatering sludge based coating material for seal of landfill site, is mainly used for seal covering of the landfill site, and belongs to the field of environmental geotechnical engineering. The municipal dewatering sludge is employed as a basis material and modified to be used in seal covering of the landfill site. An air-out layer of the coating material for seal of landfill site has good gas guide performance; an impervious layer is not easily cracking and has low permeability; and a vegetation nutrient layer has rich nutrients and good hydrophobicity. The covering material of the present invention realizes resource utilization of municipal dewatering sludge and saves land resource; the covering material can be produced by industrialized production, has a simple construction for application to seal covering of the landfill site, and has advantages of simpleness, fastness, strong operability, high survival ratio of plants, so as to guarantee quality of seal covering of the landfill site, meet various technological indexes of seal of the landfill site, and greatly improve the landfill environment.

Description

technical field [0001] The invention relates to the preparation of a landfill closure covering material based on municipal dewatered sludge, which is mainly used for the closure coverage of waste landfills and belongs to the field of environmental geotechnical engineering. Background technique [0002] With the construction and development of cities, the disposal of municipal solid waste and municipal sludge has become the focus of attention. The annual output of municipal solid waste in my country continues to increase substantially at a rate of 8.98%, and the stockpiles of waste over the years have reached 6.6 billion tons. At present, most municipal waste is disposed of in landfill. In addition, with the gradual acceleration of the construction of urban sewage treatment facilities and the increasing rate of centralized sewage treatment, the amount of sludge produced by sewage treatment plants has increased sharply, and more than 70% of my country's urban domestic waste i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B28/08C02F11/00B09B1/00
CPCY02W30/30
Inventor 薛强陈亿军万勇刘勇熊辉刘磊赵颖
Owner INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI
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