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Solidifying agent for solidifying and stabilizing treatment of generated dewatered sludge in sewage plant

A technology for stabilizing treatment and dewatering sludge, applied in the field of resources and environment, can solve the problems of high moisture content and high treatment costs, and achieve the effects of reducing harm, reducing treatment costs and reducing costs.

Inactive Publication Date: 2009-08-05
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high moisture content, high organic matter content and less inorganic solid particle components of sludge, the strength formed after solidification / stabilization treatment mainly depends on the hydration products formed by cement hydration reaction, so it needs to consume a large amount of cement to obtain a certain strength, so its processing cost is higher

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Each component of the present invention is mixed uniformly by following percentage by weight:

[0013] Sludge 65%

[0014] Cured material 15%

[0015] Bentonite 20%

[0016] The above-mentioned solidified material consists of cement, lime, fly ash and gypsum, and the weight ratio between them is cement:lime:fly ash:gypsum=14:3:2:1.

[0017] According to this ratio, 142.9kg of solidified material and 285.7kg of bentonite are added to each ton of sludge and mixed evenly. The unconfined compressive strength of the treated sludge can reach 50kPa in 7 days, and the water permeability coefficient is less than 10. -7 cm / s, which can meet the needs of landfill disposal or as landfill covering soil. Compared with the method of direct treatment without adding bentonite, it can save nearly 4 times the cost to achieve the same effect.

Embodiment 2

[0019] Each component of the present invention is mixed uniformly by following percentage by weight:

[0020] Sludge 60%

[0021] Cured material 20%

[0022] Bentonite 20%.

[0023] The above-mentioned solidified material consists of cement, lime, fly ash and gypsum, and the weight ratio among them is cement:lime:fly ash:gypsum=16:2:1:1.

[0024] Using this ratio, add 333.3kg of solidified material and 333.3kg of bentonite to each ton of sludge and mix evenly, and the unconfined compressive strength of the treated sludge can reach 100kPa within 7 days. It can meet the requirements of filling soil in general engineering, and can save nearly 5 times the cost to achieve the same effect compared with the method of direct treatment without adding bentonite.

Embodiment 3

[0026] Each component of the present invention is mixed uniformly by following percentage by weight:

[0027] Sludge 30%

[0028] Cured material 30%

[0029] Bentonite 40%

[0030] The above-mentioned solidified material consists of cement, lime, fly ash and gypsum, and the weight ratio among them is cement: lime: fly ash: gypsum=13:4:3:3.

[0031] According to this ratio, take 300kg of sludge, 300kg of solidified material, and 400kg of bentonite and mix them evenly. After 7 days, the unconfined compressive strength of the treated sludge can reach 50kPa, and the water permeability coefficient is less than 10-7cm / s. Landfill disposal or as landfill cover soil needs. Compared with the method of direct treatment without adding bentonite, it can save nearly 4 times the cost to achieve the same effect.

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Abstract

The invention relates to a solidification / stabilization treatment method for dewatered sludge produced in a sewage plant, which is characterized in that a solidification material and an auxiliary solidification material bentonite are added to the dewatered sludge in proportion by weight, and each component is mixed and stirred evenly. The weight percentage of the components is: 30-80% of sludge, 15-30% of solidified material, 5-40% of bentonite; the above-mentioned solidified material is composed of cement, lime, fly ash and gypsum in a certain weight ratio. Advantages: The treated sludge can be disposed of in landfill and used as a soil material for renewable resources. The curing agent can improve the high water content and low strength properties of the sludge, and has the advantages of improving the curing effect, reducing the amount of curing materials, and reducing the treatment cost. The components of the curing agent are cement, fly ash, lime, gypsum, and bentonite, which are widely distributed, and the price is low. There are finished products for sale, which can realize the industrialization of sludge solidification / stabilization treatment technology.

Description

technical field [0001] The invention relates to a method for solidifying / stabilizing the dewatered sludge produced in a sewage plant. The sludge solidified / stabilized by this solidifying agent can meet the requirements of landfill disposal, and can also be used as a general soil material, belonging to the field of resources and environment. Background technique [0002] At present, the disposal of sludge is mainly converted to agricultural use, incineration and landfill. The excessive heavy metals in sludge limit the agricultural use of sludge. The investment and operating costs of incineration treatment are relatively large. The sludge is sent to the sanitary landfill for landfill disposal. Due to the high moisture content and poor mechanical properties of the sludge, the direct entry of untreated sludge into the landfill often causes engineering disasters such as landslides. Due to the high moisture content, high organic matter content and less inorganic solid particle ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/14C04B28/00C04B18/08C04B22/14
CPCY02W30/91
Inventor 朱伟李磊张春雷林城
Owner HOHAI UNIV
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