Curing agent for solidification/stabilization of dewatered sludge of sewage plant and application of curing agent

A technology for stabilizing and dewatering sludge, applied in the direction of dewatering/drying/concentrating sludge treatment, etc., can solve the problems of low early strength of solidified sludge, uneven internal and external strength, and high dosage of curing agent, and achieve high strength Improve, reduce processing cost, reduce the effect of processing procedures

Active Publication Date: 2012-07-25
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Technical problem to be solved: the purpose of the present invention is to provide a curing agent for solidification / stabilization treatment of dewatered sludge in a sewage plant and its application to solve the problem of sludge solidification / stabilization In the stabilization treatment, problems such as low early strength of solidified sludge, uneven internal and external strength, and high amount of solidifying agent added

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Each component of the present invention is mixed uniformly by following percentage by weight:

[0016] Sludge 92%

[0017] Hardener 8%

[0018] The curing agent formula is: SiO 2 : 6.4 kg, Al 2 o 3 : 24 kg, CaO: 32.72 kg, SO 3 : 14.4 kg, Fe 2 o 3 : 2.4 kg, Li 2 O: 0.08 kg.

[0019] In this example, the moisture content of the sludge is 74%. According to this ratio, 80kg of solidified material is added to 920kg of sludge, mixed and stirred evenly, and the unconfined compressive strength of the sludge after treatment can reach 60kPa in 1 day , the permeability coefficient is less than 10 -7 cm / s, pH<9.5, which can meet the needs of landfill disposal or as landfill covering soil.

[0020]

Embodiment 2

[0022] Each component of the present invention is mixed uniformly by following percentage by weight:

[0023] Sludge 88%

[0024] Hardener 12%

[0025] The curing agent formula is: SiO 2 : 3.6kg, Al 2 o 3 : 42 kg, CaO: 51.24 kg, SO 3 : 19.2 kg, Fe 2 o 3 : 3.6 kg, Li 2 O: 0.36kg.

[0026] In this example, the moisture content of the sludge is 82%. According to this ratio, 120kg of solidified material is added to 880kg of sludge, mixed and stirred evenly, and the unconfined compressive strength of the sludge after treatment can reach 75kPa in 1 day , the permeability coefficient is less than 10 -7 cm / s, pH<10, which can meet the needs of landfill disposal or as landfill covering soil.

[0027]

Embodiment 3

[0029] Each component of the present invention is mixed uniformly by following percentage by weight:

[0030] Sludge 90%

[0031] Curing agent 10%

[0032] The curing agent formula is: SiO 2 : 5kg, Al 2 o 3 : 32 kg, CaO: 40.7 kg, SO 3 : 19 kg, Fe 2 o 3 : 3 kg, Li 2 O: 0.3 kg.

[0033] In this example, the moisture content of the sludge is 80%. According to this ratio, 100kg of solidified material is added to 900kg of sludge, mixed and stirred evenly, and the unconfined compressive strength of the sludge after treatment can reach 72kPa in 1 day , the permeability coefficient is less than 10 -7 cm / s, pH<10, which can meet the needs of landfill disposal or as landfill covering soil.

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Abstract

Disclosed are curing agent for solidification / stabilization of dewatered sludge of a sewage plant and application of the curing agent. Chemical components of the curing agent includes, by mass, from 3 to 8 parts of SiO2, from 25 to 35 parts of Al2O3, from 32 to 43 parts of CaO, from 15 to 23 parts of SO3, from 1 to 3 parts of Fe2O3 and from 0.1 to 0.3 part of Li2O. After the curing agent is addedinto the dewatered sludge, solidification materials quickly react with moisture in the dewatered sludge to form a needle-shaped framework, and accordingly the strength of solidified sludge is improved. Besides, the yield of products is increased along with reaction, the specific surface area of the products is large, the products have a high adsorption effect, and effects of stabilization and pollutant sealing are achieved along with increase of compactness of solidified bodies.

Description

technical field [0001] The invention relates to a curing agent for solidification / stabilization treatment of dewatered sludge in a sewage plant and an application thereof. Background technique [0002] At present, there are many technologies for sludge treatment and disposal in my country, such as landfill, incineration, composting, etc., but the most easily accepted by my country's national conditions is sludge pretreatment and landfill, which can not only ensure the harmless treatment of sludge, but also In line with the current economic level of our country. The common method of pretreatment landfill is sludge solidification / stabilization treatment technology, which has been applied on-site in Guangdong, Jiangsu, Zhejiang and other places. During the application process, it was found that due to the limitation of the curing age of the traditional curing agent (the general age is 3 days), the treatment site occupies a large area, and the treatment is easily affected by the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/14
Inventor 朱伟孙晓辉徐志荣龚淼李磊孙政张会文
Owner HOHAI UNIV
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