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Modified sludge activated carbon used for low-concentration flue gas desulfurization and denitration and preparation method thereof

A technology of sludge activated carbon and low concentration, which is applied in the field of activated carbon and can solve the problems of poor adsorption and desulfurization performance

Inactive Publication Date: 2010-08-04
TIANJIN URBAN CONSTR COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the research on preparing desulfurization activated carbon from sludge is still in the experimental stage, and the adsorption and desulfurization performance is poor.
The inventor has also disclosed a method for preparing gamma-type aluminum oxide film and vanadium pentoxide modified sludge activated carbon for flue gas desulfurization and denitrification in China 200910068313.X2479.8 patent application, but only considering The performance of desulfurization and denitrification has been compromised, and the modified components should not meet the environmental protection standards.
There is no report on its use in desulfurization and denitrification

Method used

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  • Modified sludge activated carbon used for low-concentration flue gas desulfurization and denitration and preparation method thereof
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  • Modified sludge activated carbon used for low-concentration flue gas desulfurization and denitration and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] ① Preparation of chitosan solution

[0027] Dissolve 0.20g of chitosan in 15mL of acetic acid solution (1vol%), then add 10mL of distilled water, and then ultrasonically disperse for 3h to make a 2.5wt% uniform solution;

[0028] ②Preparation of sludge activated carbon

[0029] Put the dried sludge into a carbonization furnace, carbonize at 200°C, use nitrogen to isolate the air, the nitrogen flow rate is 50L / h, the heating rate is controlled at 5°C / min, and carbonized for 4h to obtain carbonized material. Then the prepared carbonized material was activated at 1000°C, using steam with a flow rate of 100L / h, the heating rate was controlled at 15°C / min, and activated for 0.5h to obtain sludge activated carbon.

[0030] ③ Preparation of chitosan-modified sludge activated carbon for simultaneous desulfurization and denitrification of flue gas

[0031] Immerse 10g of sludge activated carbon into the solution of the above step ①, stir for 1 hour, then take it out, filter it...

Embodiment 2

[0036] ① Preparation of chitosan solution

[0037] Dissolve 0.15g of chitosan in 10mL of acetic acid solution (1vol%), add 5mL of distilled water, and then ultrasonically disperse for 6h to make a 2.0wt% uniform solution;

[0038] ②Preparation of sludge activated carbon

[0039] Put the dry sludge into the carbonization furnace, carbonize at 400°C, use nitrogen to isolate the air, the nitrogen flow rate is 100L / h, the heating rate is controlled at 15°C / min, carbonize for 1h, and the carbonized material is obtained. Then, the prepared carbonized material was activated at 500°C, using steam with a flow rate of 50L / h, the heating rate was controlled at 35°C / min, and activated for 1h to obtain sludge activated carbon.

[0040] ③ Preparation of chitosan-modified sludge activated carbon for simultaneous desulfurization and denitrification of flue gas

[0041] Immerse 5g of sludge activated carbon into the solution of the above step ①, stir for 3 hours, then take it out, filter it ...

Embodiment 3

[0045] ① Preparation of chitosan solution

[0046]Dissolve 0.10g of chitosan in 5mL of acetic acid solution (1vol%), then add 3mL of distilled water, and then ultrasonically disperse for 12h to make a 0.5wt% uniform solution;

[0047] ②Preparation of sludge activated carbon

[0048] Put the dry sludge into the carbonization furnace, carbonize at 800°C, use nitrogen to isolate the air, the nitrogen flow rate is 10L / h, the heating rate is controlled at 35°C / min, and carbonization is carried out for 0.5h to obtain carbonized material. Then the prepared carbonized material was activated at 200°C, using steam with a flow rate of 10L / h, the heating rate was controlled at 5°C / min, and activated for 4h to obtain sludge activated carbon.

[0049] ③ Preparation of chitosan-modified sludge activated carbon for simultaneous desulfurization and denitrification of flue gas

[0050] Immerse 2g of sludge activated carbon into the solution of the above step ①, stir for 5 hours, then take it ...

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Abstract

The invention discloses modified sludge activated carbon used for low-concentration flue gas desulfurization and denitration, which comprises the following ingredients in percentage by weight: 0.41 to 6.46 percent of chitosan and 93.54 to 99.59 percent of sludge. A preparation method comprises the following preparation steps: 1, preparing a chitosan solution; 2, preparing sludge activated carbon; and 3, preparing chitosan modified sludge activated carbon. The invention uses the chitosan for the sludge activated carbon for the first time, so the modified ingredients reach the green environment protection standard on the premise that the invention effectively ensures that the desulfurization and denitration performance of the sludge activated carbon is not lower than the existing level.

Description

technical field [0001] The invention relates to flue gas desulfurization and denitrification activated carbon, in particular to low-concentration flue gas desulfurization and denitrification modified sludge activated carbon. Background technique [0002] With the increasing requirements of the international community for wastewater discharge and resource protection, new sewage treatment plants are constantly being built. A large amount of sludge is also produced during the treatment of sewage, which accounts for about 0.3% to 0.5% of the treated water (calculated with a water content of 97%). These sludges are unstable, corruptible, and have a foul smell. A large amount of sludge produced by urban sewage treatment plants, after conventional sludge treatment and disposal processes such as sedimentation, concentration, digestion, dehydration and final disposal, requires a large amount of infrastructure investment and high operating costs, and its operating costs account for ab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30
Inventor 范晓丹张襄楷
Owner TIANJIN URBAN CONSTR COLLEGE
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