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Method for solidifying sludge of urban sewage treatment factory by using ardealite, coal ash and carbide slag

A technology of urban sewage and fly ash, applied in water/sludge/sewage treatment, sludge treatment, energy wastewater treatment, etc., can solve the problem of low utilization rate of carbide slag, achieve low cost, cost reduction, and increase strength Effect

Inactive Publication Date: 2012-09-12
CHONGQING UNIV
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AI Technical Summary

Problems solved by technology

At present, the utilization rate of calcium carbide slag in China is low, and the disposal methods are mainly landfill or stockpiling

Method used

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  • Method for solidifying sludge of urban sewage treatment factory by using ardealite, coal ash and carbide slag
  • Method for solidifying sludge of urban sewage treatment factory by using ardealite, coal ash and carbide slag

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Effect test

Embodiment Construction

[0026] (1) The sludge from the sewage treatment plant is directly pumped into the sludge silo 1 for temporary storage, and if the phosphogypsum 2, fly ash 3 and carbide slag 4 have been stacked for a long time, hardening and agglomeration will occur. To be crushed 5 first, and then put into the respective feed bins 7, 8, 9;

[0027] (2) Stir and mix the four materials according to the optimal ratio: sludge 70%, phosphogypsum 12%, fly ash 6%, carbide slag 12% (if necessary, it can also be adjusted within the range mentioned above) 10;

[0028] (3) Spread the mixed materials according to the thickness of 20~50cm to the special maintenance area 11 with a canopy for about seven days. The curing time varies greatly with the temperature and seasons in various places. The curing can be completed in about 2 days under the sun in summer in the south, while it may take 2 to 3 weeks in winter in the Central Plains. The solidified sludge after curing can be used as building foundation f...

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Abstract

The invention discloses a method for solidifying sludge of an urban sewage treatment factory by using ardealite, coal ash and carbide slag. The dehydrated sludge of the urban sewage treatment factory is solidified by a solidifying agent prepared from common industrial solid waste such as ardealite, coal ash and carbide slag; the solidified sludge meets the embedding indexes (the transverse shearing intensity of 25 kN / m<2> and water content of 45 percent) specified in the Urban Sewage Treatment Factory Sludge Handling-Mixing and Embedding Sludge Quality (GBT23485-2009); the pollutant concentration of solidified sludge leachate meets the requirement specified in the Living Refuse Embedding Field Pollution Control Standard and can be embedded in a living refuse embedding field and used as covering soil in the embedding field or can be used for other building basic filling constructions.

Description

technical field [0001] The invention relates to a method for solidifying sludge of urban sewage treatment plants by using phosphogypsum, fly ash and calcium carbide slag. Background technique [0002] With the progress of urbanization in our country, the amount of domestic sewage in cities and towns is increasing, and the sludge generated by sewage treatment is also increasing accordingly. According to statistics, as of 2010, the amount of dewatered sludge (with a moisture content of about 80%) produced by my country's urban sewage treatment plants reached 50 million tons. Dewatered sludge is the sediment produced in the sewage treatment process, which is composed of organic debris, bacterial cells, inorganic particles, colloids, etc., which contains a large number of microorganisms, pathogenic bacteria, heavy metals and other substances, which are harmful to the environment. [0003] The main characteristics of sludge from urban sewage treatment plants are high moisture co...

Claims

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Application Information

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IPC IPC(8): C02F11/00
CPCY02W10/37
Inventor 李东王力
Owner CHONGQING UNIV
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