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Microwave electrochemical method for processing waste water and devices thereof

A technology for wastewater treatment and electrochemistry, applied in chemical instruments and methods, water/sewage treatment, water/sewage multi-stage treatment, etc. problems, to achieve the effect of not easily damaged by microwaves, stable surface state, and wide potential window

Inactive Publication Date: 2010-03-17
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These technologies have a good degradation effect on certain types of organic pollutants, and can achieve the purpose of complete degradation or conversion into biodegradable products for subsequent treatment, but there are often the following problems: when using a single oxidation technology, the degradation efficiency Low, unsatisfactory effect when the wastewater composition is complex, etc.
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 electrochemical method for processing waste water and devices thereof
  • Microwave electrochemical method for processing waste water and devices thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: as figure 2 As shown, the device is composed of a reactor 1, an anode 2, a cathode 3, a DC power supply 4, a peristaltic pump 5, a flow meter 6, a constant temperature tank 7 and a pipeline 8. The anode 2 is a boron-doped diamond film electrode, and the cathode 3 is a titanium electrode, wherein: the anode 2 and the cathode 3 are respectively placed in the reactor 1, and the anode 2 and the cathode 3 are energized by a DC power supply 4, and the reactor 1 is placed in a microwave oven. One end of 1 is inserted into the reactor 1, and the other end passes through the peristaltic pump 5, the flow meter 6, and the constant temperature tank 7 in sequence, and is inserted into the reactor 1, so as to realize flow cycle sample injection degradation.

Embodiment 2

[0024] Example 2, with 2,4-dichlorophenoxyacetic acid wastewater as the water sample to be treated

[0025] COD of water samples Cr It is 115mg / L, the pH is 6, 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. The effects were compared with the single electrochemical degradation as a comparative test. COD of electrochemical oxidation degradation alone for 3h Cr The removal rate was only 54%; the removal rate was greatly increased to 88% when the microwave-enhanced boron-doped diamond film electrode electrochemical oxidation technology was used for 3 hours, and the removal rate increased by 63%.

[0026] Depend on figure 1 Visible (the model of SEM ...

Embodiment 3

[0027] Embodiment 3 uses methyl orange wastewater as the water sample to be treated

[0028] The TOC (total organic carbon) of the water sample is 101.5mg / L, the pH is 5, the concentration of the 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 pole 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. The effects were compared with the single electrochemical degradation as a comparative test. COD of electrochemical oxidation degradation alone for 3h Cr The removal rate is only 49%; the removal rate is greatly increased to 96% when the microwave-enhanced boron-doped diamond film electrode electrochemical oxidation technology is used for 3 hours, and the removal rate is increased by 96%.

[0029] In the large-scale treatment equipmen...

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Abstract

The invention belongs to the technical field of using an electrochemical method for processing organic-polluted waste water, and in particular relates to a microwave electrochemical method for processing waste water and devices. A boron-mixed diamond membrane electrode which has stable work under microwave action is used as an anode material of electrochemical degradation processing of the invention. Devices comprise a thermostatic bath, a peristaltic pump, a flow meter, a reactor, a boron-mixed diamond membrane electrode (anode), a titanium electrode (cathode) and a microwave oven. The invention uses microwaves for promoting the mass transferring process of organic pollutants, activates the boron-mixed diamond membrane electrode, improves electrode activity and accelerates the velocity ofelectrochemical oxidizing reaction. Compared with that of the pure electrochemical oxidization, in the same time, the removal rate of 2,4-dichlorphenoxyacetic acid of the invention is increased by 152 percents. The method has simple operation, and has good processing effect on organic waste water, and wide application prospect and developing potential.

Description

technical field [0001] The invention belongs to the technical field of treating organic polluted wastewater by electrochemical methods, and in particular relates to a microwave electrochemical method and a device for treating 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] Advanced oxidation technology is a popular research technology that is considered to have good development prospects, mainly including wet catalytic...

Claims

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Application Information

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IPC IPC(8): C02F9/08C02F1/461C02F1/30
Inventor 赵国华高俊侠吕保樱
Owner TONGJI UNIV
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