Aerating and electrochemical regenerating method for activated carbon fiber

An activated carbon fiber and electrochemical technology, which is applied in the field of three-phase electrochemical regeneration reactors, can solve the problems of large external diffusion and mass transfer resistance, and achieve the effects of simple equipment, mild electrochemical regeneration process, and convenient operation

Inactive Publication Date: 2014-09-17
扬州市形易得光电科技有限公司
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a regeneration method for adsorbing phenol-saturated activated carbon fibers to solve the problem of large external diffusion and mass transfer resistance generated in the electrochemical regeneration process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: Features: no aeration.

[0021] Weigh 0.3g of activated carbon fiber into a phenol solution with an initial concentration of 1500ppm and absorb it to saturation, then place it in a three-phase electrochemical regeneration reactor for regeneration in the anode area.

[0022] Regenerative reactor with β-PbO 2 is the anode, and the Cu plate is the cathode; 5g L -1 NaNO 3 The aqueous solution is the electrolyte, and the pH is adjusted to 3; the working current is 12 mA·cm -2 ; Regenerate for 2 hours at an electrolyte temperature of 20°C.

[0023] The adsorbent was taken out and washed with water and dried for subsequent adsorption experiments. After the initial regeneration, the regeneration rate was 48.3%, and the COD removal rate was 19.2%.

[0024] (The regeneration rate is calculated by the ratio of two consecutive adsorption amounts. The COD removal rate is obtained by calculating the difference between the theoretical COD and the measured COD after ...

Embodiment 2

[0025] Embodiment 2: Features: N 2 aeration.

[0026] Weigh 0.3g of activated carbon fiber into a phenol solution with an initial concentration of 1500ppm and absorb it to saturation, then place it in a three-phase electrochemical regeneration reactor for regeneration in the anode area.

[0027] Regenerative reactor with β-PbO 2 is the anode, and the Cu plate is the cathode; 5g L -1 NaNO 3 The aqueous solution is the electrolyte, and the pH is adjusted to 3; the working current is 12 mA·cm -2 ; use N 2 The atmosphere is aerated intensively, with a flow rate of 200 mL / min; the electrolyte is regenerated for 2 hours at a temperature of 20°C.

[0028] The adsorbent was taken out and washed with water and dried for subsequent adsorption experiments. After the initial regeneration, the regeneration rate was 62.3%, and the COD removal rate was 22.4%.

Embodiment 3

[0029] Embodiment 3: Features: O 2 aeration.

[0030] Weigh 0.3g of activated carbon fiber and put it into a phenol solution with an initial concentration of 1500ppm to absorb to saturation, and then evenly distribute it in the anode area of ​​the three-phase electrochemical regeneration reactor for regeneration.

[0031] Regenerative reactor with β-PbO 2 is the anode, and the Cu plate is the cathode; 5g L -1 NaNO 3 The aqueous solution is the electrolyte, and the pH is adjusted to 3; the working current is 12 mA·cm -2 ; using O 2 The atmosphere is aerated intensively, with a flow rate of 200 mL / min; the electrolyte is regenerated for 2 hours at a temperature of 20°C.

[0032] The adsorbent was taken out and washed with water and dried for subsequent adsorption experiments. After the initial regeneration, the regeneration rate was 66.6%, and the COD removal rate was 28.5%.

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Abstract

The invention discloses an aerating and electrochemical regenerating method for an activated carbon fiber and relates to an electrochemical regenerating technology for an activated carbon adsorption material. The gas film diffusion resistance caused by the fact that an adsorbing agent adsorbs a gas product is greatly reduced by virtue of an aerating pipe and a distributor, and the regenerating effect and the COD (chemical oxygen demand) removal rate are improved. In the regenerating process, the activated carbon fiber adsorbing phenol to be saturated is arranged in an anode area or is dispersed in an electrolyte, the adsorbing agent is taken out after the activated carbon fiber is treated, the activated carbon fiber is washed and dried, and the subsequent adsorbing-regenerating cyclic operation can be carried out. Compared with other regenerating processes, the aerating and electrochemical regenerating method has the advantages that equipment is simple; the conditions are mild; the operation is convenient; large loss caused by the activated carbon fiber in the regenerating process can be effectively avoided; by additionally arranging an aerating device, the problem of large diffusion medium transfer resistance can be solved in a targeted mode, and the regenerating efficiency is improved.

Description

technical field [0001] The invention relates to a regeneration device and method for a porous adsorbent, in particular to a three-phase electrochemical regeneration reactor for adsorbing phenol-saturated activated carbon fibers, which is characterized by intermittent operation and enhanced mass transfer by means of aeration. technical background [0002] Phenol-containing wastewater (phenol and its derivatives) has a wide range of sources, and its composition and concentration vary greatly depending on the source and process. Commonly used biological methods are difficult to treat such unstable wastewater. The adsorption method has the characteristics of a broad spectrum in wastewater treatment, and can be effectively used in the treatment of various types of phenol-containing wastewater, especially for the treatment of low-concentration phenol-containing wastewater, which is technically and economically feasible. [0003] Activated carbon is a widely available, reliable an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/34
Inventor 贾哲华王瑾赵有华
Owner 扬州市形易得光电科技有限公司
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