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Sludge modifier, and method used for preparing subgrade soil from sludge via modification

A modifier and roadbed soil technology, applied in water/sludge/sewage treatment, sludge treatment, chemical instruments and methods, etc., can solve problems such as pollution risks, water pollution, odor, etc., and achieve resource utilization , Excellent mechanical properties, simple modification method

Active Publication Date: 2015-07-29
GUANGZHOU ZHENGYUAN ENVIRONMENTAL ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the physical and chemical properties of the sludge and the colloidal structure of the mud are not changed by the solidification treatment. The solidified sludge will be reduced after soaking in rainwater, resulting in secondary sludge
The solidified sludge is not strong enough to meet the requirements of roadbed soil
The chemical properties of the sludge have not changed, and the decomposition of organic matter will produce foul odors and cause air pollution
The heavy metals contained in the sludge do not form stable compounds, and migrate into the water body through erosion to cause water pollution
Bacteria, viruses, and eggs of diseased insects in the sludge have not been effectively controlled, and there is a risk of pollution

Method used

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  • Sludge modifier, and method used for preparing subgrade soil from sludge via modification
  • Sludge modifier, and method used for preparing subgrade soil from sludge via modification
  • Sludge modifier, and method used for preparing subgrade soil from sludge via modification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025]

[0026] The sludge modifier is formed by reacting the above-mentioned oxides at a high temperature of 1200°C.

[0027] The sludge modifier and sludge generated by the above reaction are mixed in a horizontal double-shaft mixer at a ratio of 1:5, and the mixed sludge is formed at the same time, and the mixed sludge is stacked for physical and chemical reaction. To transform into stable subgrade soil, and to meet the requirements of subgrade soil, that is, to meet the requirements of ordinary cohesive soil, the content of particles with a plasticity index>10 and a particle size larger than 0.075mm does not exceed 50% of the total mass.

[0028] After testing, other index parameters of the modified sludge in Example 1 are shown in Table 1.

[0029] Because within the range of adding the sludge modifier according to the present invention, with the increase of the added amount of the sludge modifier, the reaction is more complete, and the indicators of the converted subg...

Embodiment 2

[0043]

[0044] The sludge modifier is formed by reacting the above-mentioned oxides at a high temperature of 1200°C.

[0045] The sludge modifier and sludge generated by the above reaction are mixed in a horizontal double-shaft mixer at a ratio of 1:5, and the mixed sludge is formed at the same time, and the mixed sludge is stacked for physical and chemical reaction. It is transformed into a stable subgrade soil, which meets the requirements of ordinary cohesive soil, and the content of particles with a plasticity index>10 and a particle size larger than 0.075mm does not exceed 50% of the total mass.

Embodiment 3

[0047]

[0048] The sludge modifier is formed by reacting the above-mentioned oxides at a high temperature of 1200°C. The sludge modifier and sludge generated by the above reaction are mixed in a horizontal double-shaft mixer at a ratio of 1:5, and the mixed sludge is formed at the same time, and the mixed sludge is stacked for physical and chemical reaction. It is transformed into a stable subgrade soil, which meets the requirements of ordinary cohesive soil, and the content of particles with a plasticity index>10 and a particle size larger than 0.075mm does not exceed 50% of the total mass.

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Abstract

The invention discloses a sludge modifier. The sludge modifier is prepared from 30 to 35% of silicon dioxide, 10 to 15% of aluminium oxide, 10 to 15% of iron trioxide, 30 to 35% of calcium oxide, and 3 to 5% of magnesium oxide via reaction at 1200 DEG C. The invention also discloses a method used for preparing subgrade soil from sludge via modification. According to the method, sludge with a water content of 80% is mixed with the sludge modifier at a mass ratio of 4:1-5:1; mixed sludge is obtained via stirring using a stirring device; and the mixed sludge is subjected to piling and curing, so that sludge of colloidal states is changed into sludge with crystal structures, and sludge is changed into subgrade soil. According to the method, complete modification of sludge is realized via adding of the sludge modifier, sludge is changed into subgrade soil, and no secondary argillization is caused; the method is simple, and is convenient to realize; and large scale industrialization can be realized.

Description

technical field [0001] The invention relates to the field of sludge treatment, in particular to a sludge modifier and a method for converting the modified sludge into roadbed soil. Background technique [0002] Due to the sludge produced by the sewage treatment plant in the sewage treatment process, and the moisture content of the sludge is as high as 60-99%, it also contains a large number of microorganisms, pathogens and heavy metals and other harmful substances, if not handled properly, it will cause serious secondary pollution . [0003] At present, sludge disposal is mainly based on landfill and incineration. However, due to the high moisture content of sludge, poor mechanical properties, and high pollutant content, these treatment methods have large environmental pollution, high treatment costs, or easily lead to landfill engineering. disasters, and even prone to secondary pollution. Sludge stabilization is the most common method for industrial sludge treatment in re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/14
Inventor 江业庆朱雄芬
Owner GUANGZHOU ZHENGYUAN ENVIRONMENTAL ENG CO LTD
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