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Curing agent for sludge solidification and stabilization and preparation and application thereof

A technology of sludge solidification and solidifying agent, applied in chemical instruments and methods, fixed/solidified sludge treatment, water/sludge/sewage treatment, etc., can solve problems such as unsuitable site search, limited landfill capacity, and unsafety. , to achieve the effect of simplifying the treatment process and difficulty, shortening the maintenance period, and reducing the treatment cost

Inactive Publication Date: 2015-04-15
BEIJING GEOENVIRON ENG & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are also many problems in urban sludge sanitary landfill, such as the filling pit contains various toxic and harmful substances, and the groundwater environment is polluted by rainwater erosion and leakage, which is unsafe for areas where groundwater is the source of domestic water. In addition, if the site is not suitable to find, the cost of sludge transportation and landfill construction is high, and the landfill capacity is limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] In this example, the solidification agent used for solidification and stabilization of the sludge in the sludge plant is mixed according to the following formula (percentage by weight):

[0044] Portland cement 20%,

[0045] Fly ash 30%,

[0046] Quicklime 30%,

[0047] Ferrous Sulfate 15%,

[0048] Aluminum and calcium salts 5%,

[0049] Wherein, the aluminum salt is aluminum sulfate, the calcium salt is calcium chloride, and the mass ratio of aluminum sulfate to calcium chloride is 3:1.

[0050] Application of the above-mentioned curing agent: Add 500 kg of the above-mentioned curing agent to the original sludge with a moisture content as high as 96.3% per ton, and the strength can reach 143 kPa after 4 days, which meets the strength requirements of landfill disposal and construction fill. . After testing, the leachate concentration of heavy metals meets the identification standard of leaching toxicity.

Embodiment 2

[0052] In this example, the solidification agent used for solidification and stabilization of the sludge in the sludge plant is mixed according to the following formula (percentage by weight):

[0053] Portland cement 40%,

[0054] Fly Ash 10%,

[0055] Quicklime 30%,

[0056] Ferrous Sulfate 15%,

[0057] Aluminum and calcium salts 5%,

[0058] Wherein, the aluminum salt is aluminum sulfate, the calcium salt is calcium chloride, and the mass ratio of aluminum sulfate to calcium chloride is 3:1.

[0059] Application of the above-mentioned curing agent: add 450kg of the above-mentioned curing agent to the raw sludge with a moisture content as high as 96.3% per ton, and the strength can reach 151kPa after 4 days, which meets the strength requirements of landfill disposal and construction fill. After testing, the leachate concentration of heavy metals meets the identification standard of leaching toxicity.

Embodiment 3

[0061]In this example, the solidification agent used for solidification and stabilization of the sludge in the sludge plant is mixed according to the following formula (percentage by weight):

[0062] Portland cement 40%,

[0063] Fly Ash 10%,

[0064] Quicklime: 10%,

[0065] Ferrous sulfate: 30%,

[0066] Aluminum and calcium salts: 10%,

[0067] Wherein, the aluminum salt is aluminum chloride, the calcium salt is calcium sulfate, and the mass ratio of aluminum chloride to calcium sulfate is 1:1.

[0068] Application of the above-mentioned curing agent: add 450 kg of the above-mentioned curing agent to the original sludge with a moisture content as high as 96.3% per ton, and the strength can reach 137kPa after 4 days, which meets the strength requirements of landfill disposal and construction fill. The concentration detection of the leach solution of heavy metals complied with the identification standard of leaching toxicity.

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Abstract

The invention discloses a curing agent for sludge solidification and stabilization. The curing agent contains the following ingredients by weight percentage: 20-40% of Portland cement, 10-30% of fly ash, 10-30% of lime, 10-30% of ferrous sulfate and 5-12% of inorganic salt, wherein the inorganic salt is one or a combination of more than two selected from aluminum salt, calcium salt, sodium salt and magnesium salt. The curing agent of the invention can treat raw sludge difficult for preliminary mechanical dewatering, simplify the treatment process and difficulty, shorten the construction period, lower the cost of treatment and realize good treatment effect.

Description

technical field [0001] The invention relates to the field of sludge treatment, in particular to a curing agent for solidifying and stabilizing sludge and its preparation and application. Background technique [0002] Due to the high water content, high organic matter content, low strength, and high content of harmful components such as pathogenic bacteria and heavy metals, the sludge in sludge landfills has a strong odor, so it is urgent to carry out appropriate treatment and disposal to make it The degree of harm to the ecological environment and human health can be minimized. my country's sludge treatment and disposal is still in its infancy. With the acceleration of my country's urbanization process and the increase in municipal sludge production, sludge treatment and disposal has become an increasingly urgent and severe problem in my country's environmental protection. [0003] Sludge sanitary landfill is a method commonly used in many large-scale sewage treatment plant...

Claims

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Application Information

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IPC IPC(8): C02F11/14
CPCC02F11/14C02F11/008C02F2303/06
Inventor 吕正勇魏丽冯国杰刘博韩宝禄朱湖地刘勇甄胜利李淑彩金晶孔祥斌
Owner BEIJING GEOENVIRON ENG & TECH
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