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Preparation method of sludge active carbon

A technology for sludge activated carbon and sludge, which is applied in the field of waste resource utilization, can solve the problems of low added value of products, complex preparation process, leaching of heavy metals, etc., and achieves the effects of reducing energy consumption, preparing energy consumption and good adsorption performance.

Inactive Publication Date: 2019-08-02
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This disposal method has problems such as high energy consumption, complicated preparation process, low added value of the obtained product, and heavy metal leaching.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Stir and mix the residual sludge of the sewage treatment plant with a water content of 82.5% and calcium oxide. The dry basis mass ratio of calcium oxide and sludge is 1:10, and send it into a closed reaction kettle, and the temperature rises to a final temperature of 200°C , after 1 hour of heat preservation, the reactor stopped heating and cooled to room temperature;

[0029] (2) The solid-liquid mixture in the reactor is sent to a centrifuge, and the solids obtained by separating and reducing the water content are obtained, and the water content is 55.2%;

[0030] (3) Put the solid obtained in step (2) into a tube furnace for heating. Nitrogen is introduced into the tube furnace as a protective gas. The heating rate is 10°C / min. At room temperature, a solid product was obtained;

[0031] (4) Immerse the solid product obtained in step (3) in a hydrochloric acid solution with pH=1, heat up to 50° C., filter and separate after cooling, wash the solid with distilled...

Embodiment 2

[0033] (1) Stir and mix the residual sludge of the sewage treatment plant with a moisture content of 82.5% and calcium oxide. The dry basis mass ratio of calcium oxide and sludge is 1:2, and send it into a closed reaction kettle, and the temperature rises to a final temperature of 200°C , after 1 hour of heat preservation, the reactor stopped heating and cooled to room temperature;

[0034] (2) The solid-liquid mixture in the reactor is sent to a centrifuge, and the solids obtained by separating and reducing the water content are obtained, and the water content is 49.5%;

[0035] (3) Put the solid obtained in step (2) into a tube furnace for heating. Nitrogen is introduced into the tube furnace as a protective gas. The heating rate is 10°C / min. At room temperature, a solid product was obtained;

[0036] (4) Immerse the solid product obtained in step (3) in a hydrochloric acid solution with pH=1, heat up to 50° C., filter and separate after cooling, wash the solid with distill...

Embodiment 3

[0038] (1) Stir and mix the residual sludge of the sewage treatment plant with a moisture content of 82.5% and calcium oxide. The dry basis mass ratio of calcium oxide and sludge is 1:20, and send it into a closed reaction kettle, and the temperature rises to a final temperature of 200°C , after 1 hour of heat preservation, the reactor stopped heating and cooled to room temperature;

[0039] (2) The solid-liquid mixture in the reactor is sent to a centrifuge, and the solids obtained by separating and reducing the water content are obtained, and the water content is 58.4%;

[0040] (3) Put the solid obtained in step (2) into a tube furnace for heating. Nitrogen is introduced into the tube furnace as a protective gas. The heating rate is 10°C / min. At room temperature, a solid product was obtained;

[0041] (4) Immerse the solid product obtained in step (3) in a hydrochloric acid solution with pH=1, heat up to 50° C., filter and separate after cooling, wash the solid with distil...

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PUM

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Abstract

The invention relates to a preparation method of sludge active carbon. The preparation method specifically comprises the following steps: (1) after mixing sludge with a calcium-based additive, heating, keeping warm, and cooling to a room temperature to obtain a solid-liquid mixture; (2) after centrifugal separation of the solid-liquid mixture prepared and obtained in the step (1), obtaining a water-containing solid; (3) heating the water-containing solid obtained in the step (2), keeping warm, and cooling to a room temperature to obtain a solid product; and (4) carrying out acid pickling and water washing on the solid product obtained in the step (3), and drying to obtain the sludge active carbon. Compared with the prior art, physical and chemical activation of sludge pyrolytic carbon is realized while harmless and energy sludge is realized, the sludge active carbon with large holes and low cost can be prepared, and the preparation method has the characteristics of simple technology, low preparation energy consumption, wide product adaptation and the like.

Description

technical field [0001] The invention relates to the utilization of waste resources, in particular to a preparation method of sludge activated carbon. Background technique [0002] With the acceleration of urbanization and the rapid development of social economy, the output of municipal sewage in my country has increased rapidly, resulting in an increase in the amount of municipal sewage sludge year by year. Sludge contains a variety of harmful substances. If effective measures are not taken to dispose of it, it will cause serious environmental pollution. At the same time, sludge is rich in organic matter and is considered a misplaced resource. The sludge has a high water content, and traditional disposal methods require high energy consumption. [0003] With the development of pyrolysis technology, researchers have applied pyrolysis technology to sludge disposal, which pyrolyzes sludge, and the pyrolysis products are used as soil improvers and soil remediation agents. Chin...

Claims

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Application Information

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IPC IPC(8): C01B32/324B01J20/20B01J20/30C02F1/28
CPCB01J20/20C01B32/324C02F1/281
Inventor 冯昱恒陈德珍
Owner TONGJI UNIV
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