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Method of regenerating activated charcoal for processing phenolic waste water

A technology for activated carbon and phenol wastewater, applied in separation methods, filter regeneration, chemical instruments and methods, etc., can solve the problems of high loss rate of activated carbon adsorption capacity, increased treatment costs, activated carbon loss, complex process, etc., and increase the recycling rate , Reduce the loss of activated carbon and simplify the process flow

Inactive Publication Date: 2004-11-17
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
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  • Application Information

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Problems solved by technology

In the thermal regeneration process, the activated carbon after adsorption saturation has to be treated at a high temperature of 800-850°C, which consumes a lot of energy; at the same time, the high-temperature operation makes the adsorption capacity loss rate of activated carbon large, and the adsorption capacity loss of activated carbon is 5-15% every time regeneration is performed.
In addition, the high-temperature operation makes the activated carbon unable to be regenerated in situ, requiring a specific regeneration device, which increases the treatment cost and causes a certain amount of activated carbon loss during transportation; finally, the pollutants desorbed during the heating process need to be post-treated. complex

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) the Cu5 / AC catalyst-adsorbent (the loading of Cu is 5wt%) after 0.50g adsorption phenol solution saturation is dried at normal temperature;

[0021] (2) Pack the dried Cu5 / AC catalyst-adsorbent in a fixed-bed reactor, and feed an oxidizing gas (5% O 2 ), and heating the fixed bed to raise its temperature to 260°C;

[0022] (3) Constant temperature oxidation at 260°C for 1 hr, mass spectrometry detected that the main product of oxidative degradation of phenol was CO 2 ;

[0023] (4) After the constant temperature oxidation is completed, the oxidizing gas is cut off, and the bed temperature is lowered to normal temperature under the protection of the inert gas (Ar), so that the activated carbon can be regenerated;

[0024] (5) Repeat (2)-(4), the adsorption capacity loss rate of Cu5 / AC catalytic adsorbent is between 1-10% in the multiple regeneration process, and the adsorption capacity loss rate tends to 1 with the increase of regeneration times %.

Embodiment 2

[0026] (1) The Cr5 / AC catalyst-adsorbent (the loading of Cr is 5wt%) after the saturated 0.50g adsorption phenol solution is dried at normal temperature;

[0027] (2) Pack the dried Cr5 / AC catalyzed-adsorbent in the fixed-bed reactor, and feed oxidizing gas (5% O 2 ), and heating the fixed bed to raise its temperature to 280°C;

[0028] (3) Constant temperature oxidation at 280°C for 1 hr, mass spectrometry detected that the main product of oxidative degradation of phenol was CO 2 ;

[0029] (4) After the constant temperature oxidation is completed, the oxidizing gas is cut off, and the bed temperature is lowered to normal temperature under the protection of the inert gas (Ar), so that the activated carbon can be regenerated;

[0030] (5) Repeat (2)-(4), the adsorption capacity loss rate of the Cr5 / AC catalytic adsorbent is between 3-11% in the multiple regeneration process.

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Abstract

The invention is a kind of regeneration method of active carbon for processing phenol waste water, which uses metal / active carbon sorption agent which carries some catalyst activity components, when it is absorbed and saturated, dries the sorption agent system under normal temperature, then carries on gas phase constant temperature oxidization, oxides and decomposes the organic contamination material, thus the active carbon can be regenerated, the merits of the invention is that it can be carried on under low temperature, reduces the energy consumption of regeneration process; it uses proper oxidization temperature and time, it can reduces the loss of the active carbon, increase the circular utilization of active carbon.

Description

technical field [0001] The invention belongs to the regeneration technology of activated carbon in the process of organic phenol-containing wastewater treatment, in particular to an in-situ low-temperature gas-phase catalytic oxidation regeneration method of activated carbon in the process of organic phenol-containing wastewater treatment. Background technique [0002] Phenolic compounds are present in the wastewater generated by many industrial processes and are highly toxic and difficult to biodegrade. At present, the adsorption technology based on the excellent adsorption performance of activated carbon has been widely used in the field of organic wastewater and waste gas treatment, such as Environ.Sci.Technol.1994, 28: 1403 and Chem.Eng.Progr. For the adsorbent to effectively treat the volatile organic pollutants (VOCs) in the exhaust gas, Wat.Res.2003, 37: 2347-2356 reported that the use of activated carbon adsorption properties to treat phenolic organic pollutants in w...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/34C02F1/28
Inventor 刘振宇赵江红
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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