Method for curing sludge for roadbed filling

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 ,...

AI Technical Summary

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.

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