Method for preparing activated carbon by utilizing sludge

A technology for preparing activated carbon and sludge, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve problems such as equipment corrosion and environmental pollution, and achieve the effects of improving performance, reducing pollution, and facilitating operation

Inactive Publication Date: 2018-01-12
HUAZHONG UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the activators used for sludge mainly include zinc chloride, phosphoric acid, potassium hydroxide, sulfuric acid, etc., but these activators are corrosive to the equipment, and some toxic gases will be produced during the activation process, which will cause environmental damage. Pollution

Method used

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  • Method for preparing activated carbon by utilizing sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A method for preparing activated carbon from sludge, specifically comprising the following steps:

[0028] S1 A certain amount of dewatered sludge and a certain amount of activator are transported to the screw mixing device through the feeder, and the activator is impregnated with dewatered sludge. The mass ratio of sludge to potassium-containing activator is 2:1, and the potassium-containing activator The active ingredient is potassium acetate, the potassium ion concentration is 2mol / L, and the immersion time is 8h.

[0029] S2 Transport the uniformly mixed sludge in step S1 to the screw drying device. The moisture content of the dried sludge is about 10%, and then the dried sludge is crushed and screened by a crusher, and the particles The particle size is 1.5mm.

[0030] S3 flows the screened particles into the spiral carbonization activation device for pyrolysis activation reaction. The pyrolysis temperature is about 800°C and the pyrolysis time is 1.5h. During the...

Embodiment 2

[0035] A method for preparing activated carbon from sludge, specifically comprising the following steps:

[0036] S1 A certain amount of dewatered sludge and a certain amount of activator are transported to the screw mixing device through the feeder, and the activator is impregnated with dewatered sludge. The mass ratio of sludge to potassium-containing activator is 0.5:1, and the potassium-containing activator The active ingredient is potassium acetate, the potassium ion concentration is 3mol / L, and the immersion time is 10h.

[0037] S2 Transport the uniformly mixed sludge in step S1 to the screw drying device. The moisture content of the dried sludge is about 10%, and then the dried sludge is crushed and screened by a crusher, and the particles The particle size is 0.5mm.

[0038] The particles screened by S3 flow into the spiral carbonization activation device for pyrolysis activation reaction. The pyrolysis temperature is about 750°C and the pyrolysis time is 2 hours. Du...

Embodiment 3

[0043] A method for preparing activated carbon from sludge, specifically comprising the following steps:

[0044] S1 A certain amount of dewatered sludge and a certain amount of activator are transported to the screw mixing device through the feeder, and the activator is impregnated with dewatered sludge. The mass ratio of sludge to potassium-containing activator is 3:1, and the potassium-containing activator The active ingredient is potassium acetate, the potassium ion concentration is 1mol / L, and the immersion time is 12h.

[0045] S2 Transport the uniformly mixed sludge in step S1 to the screw drying device. The moisture content of the dried sludge is within 10%. After the dried sludge is crushed and screened by a crusher, the particles The diameter is 1.5mm.

[0046] S3 flows the screened particles into the spiral carbonization activation device for pyrolysis activation reaction. The pyrolysis temperature is about 850°C, and the pyrolysis time is 1h. During the pyrolysis ...

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Abstract

The invention belongs to the technical field of sludge treatment, in particular to a method for preparing activated carbon by utilizing sludge. The method specifically comprises the following steps: S1, dipping after sludge and potassium-containing activating agent are mixed uniformly; S2, drying, crushing and screening the dipped mixture of the sludge and the potassium-containing activating agent; S3, performing a pyrolytic activation reaction on the screened mixture to obtain activated sludge coke, and cooling the activated sludge coke obtained after the reaction is ended to room temperature; S4, washing the cooled activated sludge coke by using wood vinegar liquid, and collecting the wood vinegar liquid after washing; S5, washing the activated sludge coke which is washed by using the wood vinegar liquid with water to obtain sludge activated carbon. According to the method, the sludge activated carbon which has good adsorption performance can be prepared; the corrosion of an activating agent to equipment can be reduced; the recycling of potassium acetate can be realized; the pollution to environment can be reduced; moreover, the overall process also has the advantages of high efficiency, high quality, low cost, no toxicity, convenience in operation and control and the like.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment, and more specifically relates to a method for preparing activated carbon from sludge. Background technique [0002] With the development of urban sewage treatment, a large amount of sludge is produced every year, and the treatment and disposal of sludge has become an urgent problem to be solved. Traditional treatment methods such as incineration, landfill, composting, etc. can no longer meet the requirements of environmental protection, and exploring new treatment methods has become an inevitable trend. In order to recycle sludge and make full use of the organic components contained in sludge, the preparation of activated carbon from sludge has been extensively studied. However, the current preparation process is not only costly, but also easily leads to secondary pollution. [0003] The sludge contains a large amount of ash, which hinders the formation of the pore structure of sludge ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/348C01B32/324
Inventor 邵敬爱黄河洵金前争安瑞杨海平王越兴陈应泉陈汉平张俊杰
Owner HUAZHONG UNIV OF SCI & TECH
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