Electrooxidation degradation method for dyestuff waste water by using active carbon fibre

A technology of activated carbon fiber and activated carbon fiber felt, which is applied in the field of electro-oxidative degradation of dye wastewater, which can solve the problems of large amount of sludge production and difficult post-treatment, and achieve the effects of small footprint, convenient management, and no secondary pollution

Inactive Publication Date: 2008-04-23
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the activated carbon fiber composite iron is used as the anode and the activated carbon fiber is used as the cathode, the whole process is accompanied by an electro-flocculation process in addition to the electrochemical redox, and a large amount of sludge is generated, which brings difficulties to the post-treatment.

Method used

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  • Electrooxidation degradation method for dyestuff waste water by using active carbon fibre

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1. The influence of treatment time on dye removal effect

[0023] Get 50mL concentration and be 700mg / L alizarin red S simulation dye wastewater solution (containing Na 2 SO 4 Concentration 0.1mol / L) in the electrolytic cell, adjust the pH of the solution to be 7, with a mass of 0.251g and a specific surface area of ​​1256m 2 The viscose-based activated carbon fiber felt in / g is used as the anode, and the stainless steel sheet is used as the cathode. Under the agitation of the stirrer, the constant current density is 25mA / cm 2 Electrolysis was carried out, and samples were taken regularly during the experiment to measure the decolorization rate and COD removal rate of dye wastewater at different treatment times. The color removal rate at 20, 30, 40, and 60 minutes, and the COD removal rate at 60 minutes are shown in Table 1. The results show that under the treatment of the method of the present invention, the decolorization rate of the dye wastewater reac...

Embodiment 2

[0027] Embodiment 2. When using different activated carbon fiber felts with different specific surface areas as anodes, the treatment effect of dye wastewater

[0028] Get 50mL concentration and be 700mg / L alizarin red S simulation dye wastewater solution (containing Na 2 SO 4 Concentration of 0.1mol / L) in the electrolytic cell, adjust the pH of the solution to be 7, use various activated carbon fiber felts with a mass of 0.251g as the anode, and the stainless steel sheet as the cathode, under the agitation of the stirrer, the constant current density is 25mA / cm 2 Electrolysis was carried out, and the decolorization rate and COD removal rate after 60 minutes of treatment were shown in Table 2.

[0029] In addition, a comparative experiment of carbon fiber anode was also done in Example 2, that is, using carbon fiber felt with the same quality as the anode, dye wastewater was treated under the same experimental conditions, and the decolorization rate and COD removal rate is...

Embodiment 3

[0032] Embodiment 3. The influence of the initial pH value of dye wastewater on the treatment effect

[0033] Get 50mL concentration and be 700mg / L alizarin red S simulation dye wastewater solution (containing Na 2 SO 4 Concentration 0.1mol / L) in the electrolytic cell, adjust the pH of the solution to 3-11, with a mass of 0.251g and a specific surface area of ​​756m 2 / g of polyacrylonitrile-based activated carbon fiber felt is used as the anode, and the stainless steel sheet is used as the cathode. Under the agitation of the stirrer, the constant current density is 25mA / cm 2 Carry out electrolysis, the COD removal rate in the time of 60 minutes is as shown in table 3. The results show that under neutral (pH=7) conditions, the COD removal rate of dye wastewater can reach 73.1% after 60 minutes.

[0034] Table 3 Effect of initial pH value on COD removal rate of dye wastewater

[0035] pH value

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Abstract

This invention relates to a method for electrooxidation degradation of dye waste-water by utilizing activated carbon fiber, particularly by using the activated carbon felt as anode material. It comprises steps of: (1), feeding wastewater into the electrolytic cell, (2), the cell is equipped anode activated carbon fiber and stainless steel cathode, (3), power-in the DC power and starting the agitator, proceeding electrolysis with current density of 15-35mA/cm2, voltage of 5-12V. The absorption makes the enrichment of organic dye on the surface of the activated carbon, and oxidation and degradation of the absorbed dye occurs by electrocatalysis oxidation, after the treatment, the decolourisation is upto 99%, COD removal rate is 87.9%.

Description

technical field [0001] The invention belongs to the application field of water treatment, and in particular relates to a method for electrooxidatively degrading dye wastewater by using activated carbon fiber as an anode material. Background technique [0002] Printing and dyeing wastewater has the characteristics of large water volume, high concentration, complex composition, and high chroma, and is one of the most difficult industrial wastewater to treat. Traditional methods for dye wastewater treatment include chemical coagulation, biological and activated carbon adsorption. With the continuous improvement of people's requirements for environmental quality, it is difficult for traditional treatment methods to meet the wastewater discharge standards. In recent years, many advanced oxidation techniques have been proposed, such as O 3 Oxidation method, wet oxidation technology, supercritical water oxidation method, photocatalytic oxidation method, electrochemical oxidation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/46C02F103/30
Inventor 陈水挟易芬云
Owner SUN YAT SEN UNIV
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