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Resource recycling method of calcium-adding drying sludge

A drying sludge and recycling technology, applied in the direction of sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problem of underutilization of sludge, secondary pollution of the environment, and a lot of manpower Material resources and other issues, to achieve the effect of easy loading and transportation

Inactive Publication Date: 2010-05-12
BEIJING AOLIAIDE S&T DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, the calcium-increased and dried sludge has not been fully utilized, which not only causes secondary pollution to the environment, but also pays a lot of manpower and material resources for subsequent treatment (such as transportation, landfill, etc.)

Method used

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  • Resource recycling method of calcium-adding drying sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Gravel (25-35mm in particle size): calcium-increasing sludge: cement=40-50: 10-40: 5-10 (parts by weight);

[0028] The road-mixing method is adopted for construction. After mixing evenly, it is compacted and formed under the optimum water content. The compaction degree is 97%, and the compressive strength at 7-day age is 1.248MPa. , the small test had fewer cracks than the control section of lime-cinder soil.

Embodiment 2

[0030] Cement: fly ash (as produced by coal-fired thermal power generation): calcium-increasing sludge slag=5-10: 10-20: 50-70 (parts by weight);

[0031] The road-mixing method is used for construction. After mixing evenly, it is compacted and formed under the optimum water content. The compaction degree is 97%, and the compressive strength at the age of 3 days is 1.6MPa.

Embodiment 3

[0033] Cement: calcium-increasing sludge: crushed stone=5-10: 10-20: 60-70 (parts by weight)

[0034] The road-mixing method is used for construction. After mixing evenly, it is compacted and formed under the optimum water content. The compaction degree is 97%, and the compressive strength at 7-day age is 1.223MP.

[0035] The above-mentioned three implementations are directed at the inorganic material configuration method required for the base in road construction, and the components of the plain soil (comprising ordinary soil and construction dregs, etc.) in the backfill soil at the bottom of the road can be replaced by sludge slag.

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Abstract

The invention relates to a resource recycling method of calcium-adding drying sludge. The calcium-adding drying sludge comprises the following components in percentage by weight: more than or equal to 80 percent of granules with grain diameter of 5mm, less than or equal to 10 percent of organic matters, 5-20 percent of water and over 30 percent of calcium hydroxide. The calcium-adding drying sludge is mixed with cement, gravel and water uniformly according to a certain proportion to form a mixture; and the mixture is used as a roadbed material of road, cushion soil of refuse landfill, covering soil, improved soil and environmental modification basic layer to be paved on the corresponding bases. The calcium-adding drying sludge replaces inorganic materials, thereby fulfilling the aims of saving energy and reducing discharge value in the waste resource recycling process, saving natural resources, and greatly reducing the cost of treatment of the waste.

Description

technical field [0001] The invention relates to a method for harmless and resourceful utilization of urban sludge, which is mainly used for advanced disposal and resourceful recycling of urban sludge residue after calcium-increasing and drying. Background technique [0002] In recent years, the sludge treatment methods that consume various energy include the use of part of the waste heat, the use of waste heat, and the chemical heat of the lime heating agent, etc., which have not left the use of disposable energy. Energy consumption is thermally decomposed in an oxygen-free environment. In the process of using the decomposed sludge as low calorific value fuel and other carbonized products, various carbonization treatment methods are adopted, which inevitably leads to the increase of carbon dioxide and the intensification of the greenhouse effect. [0003] In order to recycle the sludge into environmentally harmless inorganic materials, it is necessary to dehydrate and dry th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B18/30
CPCY02W30/91
Inventor 陈子庭霍健周军魏威
Owner BEIJING AOLIAIDE S&T DEV
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