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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: 2008-05-07
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 curing agent used for curing and stabilizing dewatered sludge produced by a sewage plant. The invention is characterized in that curing material and assistant curing material bentonite are added by weight in the dewatered sludge, and each component is mixed evenly, and the weight percentage of each component is 30 to 80 percent of sludge, 15 to 30 percent of curing material, and 5 to 40 percent of bentonite. The curing material is formed by concrete, lime, fly ash and gypsum by weight. The invention has the advantages that the disposed sludge can be disposed by burying to be as fillings for the using of renewable recources. The curing agent can improve the high water content and the low intensity of the sewage, and has the advantages of increasing curing effect, reducing curing material use amount and reducing disposal cost. The compositions of the curing agent of concrete, fly ash, lime, gypsum and bentonite have wide distribution and low price with finished produces selling, thereby realizing the industrialization of sludge curing and stabilizing techniques.

Description

technical field [0001] The invention relates to a solidifying agent used in solidifying / stabilizing treatment of 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 i...

Claims

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Application Information

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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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