Composite curing agent for city sludge solidification/stabilization and application thereof

Abstract

The invention belongs to the field of municipal and environment engineering, and relates to a composite curing agent for city sludge solidification / stabilization and a method for solidifying and stabilizing dehydrated sludge of municipal wastewater treatment plants by using the curing agent. The composite curing agent for city sludge solidification / stabilization is characterized by comprising cement, fly ash, waterless gypsum, lime, active magnesium oxide, iron powder and powder active carbon by mixing, and mass percentage of each raw material is as follows: 10%-25% of cement, 45%-60% of fly ash, 5-10% of waterless gypsum, 10%-20% of lime CaO and active magnesium oxide, 1-2.5% of iron powder and 1-2.5% of powder active carbon. The composite curing agent can shorten sludge solidification time with a good solidification and stabilization effect.

Description

technical field [0001] The invention belongs to the field of municipal and environmental engineering, and specifically relates to a composite solidifying agent for solidifying and stabilizing urban sludge, and a method for solidifying and stabilizing the dewatered sludge of urban sewage plants with the solidifying agent. Background technique [0002] At present, a large amount of biochemical sludge (that is, urban dewatered sludge, or urban sludge) is produced during the biochemical treatment of urban sewage treatment plants. The harmful components in urban sludge are relatively high, such as pathogenic microorganisms, salt, and refractory organic matter. , heavy metals, etc. my country's sludge treatment and disposal is still in its infancy. Among the existing sewage treatment facilities in the country, less than 1 / 2 have sludge stabilization treatment facilities, less than 1 / 10 have relatively complete treatment processes and supporting equipment, and less than 1 / 10 of the...

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Problems solved by technology

But it also has some problems, such as the site is not suitable to find, the sludge transportation and landfill construction costs are high, the landfill capacity is limited, the leakage of harmful components may cause groundwater pollution, and the sanitation and odor of the landfill will cause pollution. Secondary pollution, the nutrients contained in the sludge will cause a large number of pathogenic bacteria to multiply, etc.

[0004] In recent years, safe landfill technology has developed rapidly. At present, the main components of various solidification / stabilization products on the market are: lime, cement, fly ash, etc., which have achieved a certain solidification and stabilization effect, but there are still certain problems. The curing agent hardens the soil, which is not effective in stabilizing heavy metals and toxic organic matter. Simply using lime will make the soil alkalized seriously.

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