Method for curing sludge for roadbed filling

A technology of roadbed and sludge, applied in the field of resources and environment, can solve the problems of environmental burden and waste of resources, reduce the stability of sludge solidified soil, and have no guarantee of long-term stability, achieve strong acid resistance and alkali resistance, inhibit Bacterial growth and long-term stability

Inactive Publication Date: 2016-07-06
SUN YAT SEN UNIV
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Problems solved by technology

However, the sludge solidification soil formed after solidification by traditional methods has high alkalinity, and the pH value often reaches about 12. Under the leaching of rainwater, the leaching lye will pollute the surrounding environment
Moreover, as the alkalinity of the sludge decreases, microorganisms begin to reproduce and decompose the organic matter in the sludge-solidified soil, which reduces the stability of the sludge-solidified soil and easily leads to the instability and destruction of the solidified pile.
Therefore, the sludge solidified by the traditional method has not completely eliminated the pollution characteristics, the long-term stability is not guaranteed, and it cannot meet the requirements of roadbed filling. It can only be used for landfill, causing a burden on the environment and a waste of resources.

Method used

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  • Method for curing sludge for roadbed filling
  • Method for curing sludge for roadbed filling

Examples

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Effect test

Embodiment 1

[0020] Take 100kg of dewatered sludge from urban sewage plants with a moisture content of 80%, first add 10kg of quicklime, stir evenly, then add 5kg of emulsified asphalt, and carry out the second stirring, then add 500kg of natural soil after stirring evenly, and carry out the second Stir three times. Finally, the sludge-solidified soil was placed in a curing field, and after 7 days of dry curing, the compressive strength of the sludge-solidified soil reached 1000kPa. The results of toxicity leaching tests show that the detected amounts of various heavy metals and organic matter do not exceed the standard, which can meet the requirements of roadbed filling.

Embodiment 2

[0022] Take 100kg of dewatered sludge from urban sewage plants with a water content of 80%, first add 15kg of quicklime, stir evenly, then add 8kg of emulsified asphalt, and carry out the second stirring, then add 400kg of natural soil after stirring evenly, and carry out the second Stir three times. Finally, the sludge-solidified soil is placed in the curing field. After 7 days of dry curing, the compressive strength of the sludge-solidified soil reaches 900kPa, which can meet the requirements of roadbed filling. The results of toxicity leaching tests show that the detected amounts of various heavy metals and organic matter do not exceed the standard, which can meet the requirements of roadbed filling.

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Abstract

The invention relates to a method for curing sludge for roadbed filling. The method is characterized in that quick lime, emulsified asphalt and natural soil are adopted as curing materials, and the method comprises the following steps that 1, 5% to 15% of quick lime is added to the sludge with the moisture content of 65% to 85% to be stirred; 2, after the quick lime is stirred to be uniform, 5% to 10% of emulsified asphalt is added for secondary stirring; 3, after the emulsified asphalt is stirred to be uniform, 400% to 500% of natural soil is added to be stirred for the third time; 4, after the stirred sludge is cured for dry maintenance for 7 days, the sludge is directly used for roadbed filling. The method has the advantages that the treated sludge cured soil is high in strength, free of pollution and high in long-term stability. The sludge cured soil can be directly used for roadbed filling, waste is turned into wealth, and high economic benefits are achieved.

Description

technical field [0001] The invention relates to a method for solidifying sludge for roadbed filling, which belongs to the field of resources and environment. The sludge solidified by the method has high compressive strength, eliminates pollution properties, has long-term stability, and can be directly used for roadbed filling. Background technique [0002] Sewage sludge is a waste product of urban sewage treatment plants after sewage treatment. It often contains a large number of microorganisms, organic pollutants, heavy metals, etc. It is a pollutant with complex components and highly concentrated harmful substances. With the acceleration of my country's urbanization process and the improvement of environmental protection awareness, the amount of urban sewage generated and treated is also increasing, and correspondingly, the amount of sludge generated has also increased significantly. By the end of 2010, the national urban sewage treatment volume exceeded 30 billion m 3 ,...

Claims

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Application Information

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IPC IPC(8): C02F11/00E01C3/00E02D17/18
CPCE01C3/003E02D17/18C02F11/008
Inventor 林署炯陈剑尚冉孟胶张澄博
Owner SUN YAT SEN UNIV
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