Microwave electro-Fenton method for processing organic wastewater and device thereof

A technology of organic wastewater and Fenton's method, which is applied in water/sewage treatment, light water/sewage treatment, oxidized water/sewage treatment, etc. It can solve the problem of weak oxidation and degradation ability of pollutants, limited working life and easy pollution of electrodes and other problems, to achieve ideal degradation effect, wide potential window, and promote the effect of reaction rate

Inactive Publication Date: 2012-11-07
TONGJI UNIV
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional carbon electrodes and metal oxide electrodes are easily damaged under the action of microwaves, and their working life is limited; while metal electrodes are not strong in oxidative degradation of pollutants
Moreover, the surface of these electrodes is prone to contamination, so it is not an ideal electrode material for the combination of electrochemical oxidation and microwave technology.

Method used

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  • Microwave electro-Fenton method for processing organic wastewater and device thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A device for the microwave electro-Fenton method of treating waste water, its structure is shown in Figure 3, the device includes an air aeration device 1, a thermometer 2, a storage pool 3, a flow meter 4, a DC power supply 5, a cathode 6, an anode 7. Composed of a peristaltic pump 8, a microwave oven 9, a condenser tube 10 and a reactor 11. The anode 7 adopts a boron-doped diamond film electrode, and the cathode 6 adopts a titanium electrode, wherein: wherein the cathode 6 and the anode 7 are respectively inserted into the reactor 11, the anode 7 and the cathode 6 are connected through a DC power supply 5, and the reactor 11 is placed in a microwave oven 9. One end of the pipeline is inserted into the reactor 11, and the other end passes through the peristaltic pump 8, the flow meter 4, and the condenser tube 10 in sequence, and is inserted into the storage pool 3, so as to realize flow cycle sample introduction and degradation. The aeration device 1 and the thermomet...

Embodiment 2

[0027] Using methyl orange wastewater as the water sample to be treated

[0028] The TOC of the water sample is 300mg / L, the pH is 3.0, the Fe 2+ is 1.0mmol / L, the concentration of supporting electrolyte sodium sulfate is 0.05mol / L, and the volume is 100ml. The area of ​​boron-doped diamond film electrode and titanium electrode as anode and cathode respectively is 3.5cm 2 , the electrode spacing is 1cm, the current density is 10mA / cm 2 Carry out constant current degradation, the microwave frequency is 2450MHz, and the power is 120W. The effects were compared with the electro-Fenton degradation alone as a comparative test. The TOC removal rate was only 38.5% when electro-Fenton oxidation degradation was performed for 3 hours alone; the removal rate was greatly increased to 95.8% when microwave-enhanced boron-doped diamond film electrode electro-TOC oxidation technology was used for 3 hours, and the removal rate increased by 148.8%.

Embodiment 3

[0030] Use 2,4-dichlorophenoxyacetic acid wastewater as the water sample to be treated

[0031] COD of water samples Cr 200mg / L, pH 3.0, Fe 2+ is 1.0mmol / L, the concentration of supporting electrolyte sodium sulfate is 0.05mol / L, and the volume is 100ml. The area of ​​boron-doped diamond film electrode and titanium electrode as anode and cathode respectively is 5.5cm 2 , the electrode spacing is 1cm, the current density is 20mA / cm 2 Carry out constant current degradation, the microwave frequency is 2450MHz, and the power is 120W. Use electro-Fenton degradation alone as a comparative test to compare the effects. COD of electro-fenton oxidation degradation for 3 hours Cr The removal rate was only 65%; the removal rate was greatly increased to 98% when the microwave-enhanced boron-doped diamond film electrode electrochemical oxidation technology was used for 3 hours, and the removal rate increased by 50.8%.

[0032] In large-scale treatment equipment for practical applicati...

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Abstract

The invention relates to a microwave electro-Fenton method for processing organic wastewater and a device thereof. Under the action of microwave, a boron-doped diamond film electrode is used as an anode material for electrochemical degradation processing, and organic pollutant containing wastewater is processed efficiently by an electrochemical method. According to the invention, the boron-doped diamond film electrode is utilized to continuously generate hydroxyl radical with strong oxidation capacity in a wastewater system containing divalent iron ions, and in-situ activation of the boron-doped diamond film electrode is carried out by means of thermal effect and non-thermal effect of microwave so as to increase activity of the electrode and promote mass transfer process during the degradation process of organic pollutants. Therefore, the oxidation capacity of the electro-Fenton reaction is enhanced, and mineralization reaction rate is effectively accelerated. In comparison with traditional Fenton and electro-Fenton methods, the processing effect of the microwave electro-Fenton method provided by the invention is effectively enhanced. The method provided by the invention is simple to operate, has a good effect of processing organic wastewater, and has a wide application prospect as well as development potential.

Description

technical field [0001] The invention relates to the technical field of treating organic polluted wastewater with an electrochemical method, in particular to a microwave electro-Fenton method and a device for treating organic wastewater. Background technique [0002] With the continuous development of social industrialization, global environmental problems have become increasingly prominent, especially the discharge of a large amount of industrial and agricultural sewage and domestic wastewater has caused serious pollution of water bodies by organic matter; due to the variety of organic pollutants, complex material structure, toxic and harmful Therefore, in recent years, how to deal with refractory biodegradable organic pollutants in water bodies has become a key and difficult point in environmental protection research. [0003] In recent years, the emergence of advanced oxidation technologies represented by ozone oxidation, electrochemical oxidation, photocatalytic oxidation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/461C02F1/72C02F1/30C02F101/36C02F101/34
Inventor 赵国华王宇晶高俊侠
Owner TONGJI UNIV
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