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Waste activated carbon regeneration method

An activated carbon and activation treatment technology, which is applied in separation methods, filter regeneration, chemical instruments and methods, etc., can solve the problems of environmental secondary pollution, scarcity of production resources, high price of activated carbon, etc., achieve enhanced regeneration efficiency, reduce production costs, The effect of high regeneration value

Active Publication Date: 2021-03-30
长沙工研院环保有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Activated carbon is a non-toxic and tasteless adsorption material with well-developed pore structure, large specific surface area, and is currently widely used in advanced treatment of urban sewage, industrial wastewater and purification of polluted water sources. However, due to the high price of activated carbon, the production resources are more expensive If the saturated activated carbon is discarded, it will inevitably cause a waste of resources and cause secondary pollution to the environment. Therefore, from the perspective of economy and environmental protection, the regeneration of activated carbon is of great significance

Method used

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  • Waste activated carbon regeneration method

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Embodiment 1

[0030] The method for regeneration of the waste activated carbon comprises the following steps:

[0031] Take out the saturated activated carbon and connect it to the vacuum thermal desorption device, start to raise the temperature and turn on the vacuum pump for desorption regeneration. During the desorption process, the vacuum degree is controlled at about 19kPa.

[0032] Starting from the initial desorption temperature (30°C), gradually increase the desorption temperature at intervals of 5°C, the interval time is 10 seconds, increase the desorption temperature to 90°C, and maintain the temperature at 90°C until the adsorption equilibrium state. At this time, the desorption rate of VOCs in activated carbon reaches 90%.

[0033] Wash the waste activated carbon with distilled water to ensure that visible impurities are cleaned, and dry at room temperature until the moisture content is 45%; this step is mainly to remove soluble substances;

[0034] Heat the cleaned wet charco...

Embodiment 2

[0042] The method for regeneration of the waste activated carbon comprises the following steps:

[0043] Take out the saturated activated carbon and connect it to the vacuum thermal desorption device, start to raise the temperature and turn on the vacuum pump for desorption regeneration. During the desorption process, the vacuum degree is controlled at about 19kPa.

[0044] Starting from the initial desorption temperature (30°C), gradually increase the desorption temperature at intervals of 5°C, the interval time is 10 seconds, raise the desorption temperature to 90°C, and maintain the temperature at 90°C to the adsorption equilibrium state , and the desorption rate of VOCs in activated carbon reaches 90%.

[0045] Wash the waste activated carbon with distilled water to ensure that visible impurities are cleaned, and dry at room temperature until the water content is 44%; this step is mainly to remove soluble substances;

[0046] Heat the cleaned wet charcoal at 110°C to evap...

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Abstract

The invention relates to the field of industrial tail gas treatment, and discloses a waste activated carbon regeneration method, which comprises the following steps: performing vacuum thermal desorption on waste activated carbon until the desorption rate of VOCs in the waste activated carbon reaches 90% or above; washing the waste activated carbon subjected to vacuum thermal desorption to obtain wet activated carbon, drying the wet activated carbon, roasting in a protective atmosphere, carbonizing in an atmosphere with the oxygen content of less than or equal to 1%, activating in a mixed atmosphere of water vapor and carbon dioxide, and cooling to obtain regenerated activated carbon. Before entering the activated carbon regeneration stage, the activated carbon is subjected to vacuum desorption by reducing the pressure. Compared with the traditional heating desorption, the addition of a vacuum desorption regeneration technology reduces the temperature required by desorption regeneration, generates less waste gas, and does not cause serious pollution to the atmosphere; the combination of the process enables the overall reaction temperature of the whole method to be lower, but the adsorption capacity and reuse frequency of the produced product are both improved.

Description

technical field [0001] The invention relates to a method for regenerating waste activated carbon, which belongs to the technical field of environmental protection. Background technique [0002] The regeneration of activated carbon is the reverse process of activated carbon adsorption, that is, the activated carbon saturated with various impurities undergoes special treatment to restore the adsorption capacity of activated carbon so that it can be reused in the adsorption process, improve its service life, reduce production costs, and reduce waste of resources. Activated carbon is a non-toxic and tasteless adsorption material with well-developed pore structure, large specific surface area, and is currently widely used in advanced treatment of urban sewage, industrial wastewater and purification of polluted water sources. However, due to the high price of activated carbon, the production resources are more expensive If the saturated activated carbon is discarded, it will inevi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/34B01J20/20
CPCB01J20/3416B01J20/3483B01J20/20
Inventor 宁健翔何曦
Owner 长沙工研院环保有限公司
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