Method for treating organic waste water by using electrochemistry under assistance of persulfate

A technology of organic wastewater and persulfate, applied in electrochemical water/sewage treatment, oxidized water/sewage treatment, etc., to achieve good practical application prospects, realize recycling, and reduce side reactions

Inactive Publication Date: 2011-11-23
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the efficiency of a single electrochemical method to treat dye wastewater is still limited, and it is necessary to prolong the reaction time or increase the current density to achieve a certain decolorization effect.

Method used

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  • Method for treating organic waste water by using electrochemistry under assistance of persulfate
  • Method for treating organic waste water by using electrochemistry under assistance of persulfate
  • Method for treating organic waste water by using electrochemistry under assistance of persulfate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: In this example, three systems of ferric ion-activated persulfate (1), separate electrolysis (2) and ferrous ion-activated persulfate (3) under electrochemical action are compared to orange yellow II The effect of decolorization efficiency. In the ferric ion-activated persulfate system, the decolorization rate of Orange II remained basically unchanged after 5 min of reaction, and the decolorization rate was limited. In the single electrolysis system, the decolorization rate of orange-yellow II increased with the progress of the reaction, and the decolorization rate of orange-yellow II reached 65.8% after the reaction for 60 min. In the system in which persulfate was activated by ferric ions under electric field conditions, the decolorization efficiency of Orange II was much greater than that of the former two systems. This example shows that the combined application of the first two systems has a synergistic effect, which can effectively improve the decolori...

Embodiment 2

[0056] Example 2: In this example, the effects of different valence iron ions on the decolorization efficiency of Orange II were compared. Ferric iron ions (1) and divalent iron ions (2) were put into the system as iron sources, respectively. This example shows that in the system adding ferric ions, the decolorization rate in the initial stage of the reaction is lower than the system adding ferrous ions. However, with the progress of the reaction, the ferric ions are reduced to ferrous iron at the cathode and the persulfate is activated. After 60 min of reaction, the system adding ferric ions as the iron source can also achieve better decolorization effect. Therefore, under electrochemical action, ferric ions can also act as iron sources to activate persulfate by reducing to ferrous ions. The detailed operating conditions and processing results are as follows:

[0057] 1. Operating conditions:

[0058] Anode: Titanium-based DSA flat electrode

[0059] Cathode: stainless st...

Embodiment 3

[0070] Example 3: In this example, the effects of different pH conditions on the decolorization efficiency of Orange II were compared. The decolorization efficiency of Orange II was investigated in acidic pH 3 (1) and alkaline pH 9 (2) systems, respectively. This example shows that the decolorization effect of Orange II under alkaline conditions is slightly lower than the decolorization effect of Orange II under acidic conditions, but it can also achieve a better treatment effect. The detailed operating conditions and processing results are as follows:

[0071] 1. Operating conditions:

[0072] Anode: Titanium-based DSA flat electrode

[0073] Cathode: stainless steel flat electrode

[0074] Electrode size: 5×11.9 cm

[0075] Orange II solution concentration: 44 mg / L

[0076] Dye waste water volume: 200 mL

[0077] Persulfate concentration: 4 mmol / L

[0078] Ferric ion dosage: 56 mg / L

[0079] Molar ratio of persulfate to ferrous ion: 4:1

[0080] Power supply: DC, 1 ...

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Abstract

The invention relates to a method for treating organic waste water by using electrochemistry under the assistance of persulfate. The method comprises the following steps of: putting sulfate, a divalent or tervalent ferric salt and organic waste water into an electrochemical reactor consisting of a DSA (Dimensional Stable Anode) and an anti-corrosive cathode; adjusting the pH value of a reaction liquid to 3-9; stirring; and switching on a power supply for reacting. The method is characterized in that: special requirement on the ferric salt is not made, the ferric salt can be divalent or tervalent, generated free sulfate radicals can be used for effectively treating organic pollutants in water; meanwhile, in the electrochemical reactor, reutilization of divalent ferric ions can be realized under the reducing action of the cathode, so that the adding amount of the ferric salt is reduced, side reactions between an excessive amount of ferric salt and free sulfate radicals are reduced, ineffective consumption of free sulfate radicals is avoided, and the generation of iron sludge is reduced simultaneously.

Description

technical field [0001] The invention belongs to the field of waste water treatment and relates to a method for treating organic waste water with electrochemical cooperation with persulfate. Background technique [0002] Water pollution control is a hot issue in today's society. Advanced oxidation technology can effectively mineralize or oxidize and degrade organic pollutants in wastewater, and has a good application prospect. Traditional advanced oxidation techniques (such as Fenton's reagent) mainly react with organic matter by generating highly oxidizing hydroxyl radicals. The wastewater treatment method based on the activation of persulfate to generate sulfate radicals is a new type of advanced oxidation technology. [0003] Compared with the traditional Fenton's reagent, persulfate is a powdery solid substance, which is more stable than liquid hydrogen peroxide, difficult to decompose and easy to transport. In addition, the standard redox potential of the sulfate rad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/46C02F1/72
Inventor 张晖吴捷张道斌
Owner WUHAN UNIV
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