Sludge-based activated carbon and preparation method thereof

A technology of activated carbon and sludge, applied in the field of activated carbon, can solve the problem of high cost, achieve the effect of low cost, increase carbon content, and solve the problem of exit

Inactive Publication Date: 2012-07-04
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Activated carbon is an excellent adsorption material with rich internal pore structure and high specific surface area, but its raw materials are mainly carbonaceous materials such as coal and wood, and the cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 1) drying the sludge until the moisture content is below 10%, grinding and sieving, and retaining the sludge particles with a particle size ranging from 20 to 100 mesh;

[0017] 2) Dry the crop stalks until the water content is below 10%, weigh 25% of the dried crop stalks and add them to the sludge granules, and then mix the sludge granule samples with 4mol / l potassium hydroxide solution in a mass ratio of 1 : 2 after mixing, soak for 12h at normal temperature, then dry to constant weight to obtain activated sludge granules;

[0018] 3) After heating the activated sludge particles at a heating rate of 15°C / min to 550°C for 90 minutes, cooling in nitrogen, then washing with hydrochloric acid and distilled water at 70°C, and drying to obtain sludge activated carbon;

[0019] The specific surface area of ​​sludge activated carbon is 642m 2 / g.

Embodiment 2

[0021] 1) drying the sludge until the moisture content is below 10%, grinding and sieving, and retaining sludge particles with a particle size range below 100 mesh;

[0022] 2) Dry the crop stalks until the water content is below 10%, weigh 50% of the dried crop stalks and add them to the sludge granules, and then mix the sludge granule samples with 5mol / l zinc chloride solution in a mass ratio of 1 : 2 after mixing, soak for 24h at normal temperature, then dry to constant weight to obtain activated sludge granules;

[0023] 3) After heating the activated sludge particles at a heating rate of 15°C / min to 550°C for 90 minutes, cooling in nitrogen, then washing with hydrochloric acid and distilled water at 70°C, and drying to obtain sludge activated carbon;

[0024] The specific surface area of ​​sludge activated carbon is 733m 2 / g.

Embodiment 3

[0026] 1) drying the sludge until the moisture content is below 10%, grinding and sieving, and retaining sludge particles with a particle size range below 100 mesh;

[0027] 2) Dry the crop stalks until the water content is below 10%, weigh 10% of the dried crop stalks and add them to the sludge granules, and then mix the sludge granule samples with 4mol / l potassium carbonate solution in a mass ratio of 1: 3 After mixing, immerse at room temperature for 24 hours, and then dry to constant weight to obtain activated sludge particles;

[0028] 3) The activated sludge particles were heated to 600°C at a heating rate of 15°C / min and kept warm for 60 minutes, cooled in nitrogen, then washed with hydrochloric acid and distilled water at 70°C, and dried to obtain sludge activated carbon;

[0029] The specific surface area of ​​sludge activated carbon is 582m 2 / g.

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Abstract

The invention relates to a sludge-based activated carbon and a preparation method thereof. In the invention, according to composition of sludge, a certain amount of biomass material (such as corn straw, wheat straw, peanut shell and the like) is appropriately added, mixing to be uniform is carried out, and carbon content of agricultural waste such as crop straw, peanut shell and the like is relatively higher, thus adsorption capacity of the activated carbon is improved (can be improved) when the crop straw and the peanut shell are added into sludge. Activating agent with certain concentration (such as ZnCl2, KOH, KCO3 and the like) is added into the sludge which is mixed to be uniform, impregnating and activating treatment is carried out, and then high temperature activation is carried out, thus the sludge-based activated carbon can be obtained. The sludge-based activated carbon provided by the invention has the advantages of simple process, low cost, and high specific surface area; meanwhile, a way is provided for recycling sludge and treating the agricultural waste, and hazard-free treatment, reduction and reutilization on waste treatment are realized.

Description

technical field [0001] The invention relates to a sludge activated carbon with surplus sludge from urban sewage treatment plants as the main raw material and a preparation method thereof, which is suitable for the removal of various toxic gases and COD and colored substances in sewage, and belongs to the technical field of activated carbon. Background technique [0002] As the number of urban sewage treatment plants and the amount of treated water increase year by year, the amount of by-product sludge is also increasing sharply. Sewage treatment plant sludge contains a large amount of organic matter and toxic and harmful substances (including heavy metals, microorganisms and toxic and harmful substances). If not treated, it will cause serious secondary pollution. The final methods of sludge treatment at home and abroad mainly include sludge landfill, land treatment, incineration and heat treatment. Incineration is likely to cause secondary pollution, and the heavy metal smo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/12C01B32/324C01B32/348
Inventor 李依丽李利平梁文俊王姚尹晶
Owner BEIJING UNIV OF TECH
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