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Wet-type electrocatalytic oxidation method and device

A catalytic oxidation and wet electricity technology, applied in the field of oxidation, can solve the problems of high-concentration wastewater without considering the full use of heat, not considering the treatment of high-concentration wastewater, and not considering the corrosion of equipment, so as to reduce polarization, easy maintenance, The effect of mitigating corrosion

Active Publication Date: 2011-02-16
GUANGAN LIER CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Evaluation: The shortcoming of this scheme is intermittent operation, and it does not consider the corrosion of equipment, the polarization phenomenon of fixed anodes, and the treatment of high-concentration wastewater
The heat of high-concentration wastewater has not been fully utilized

Method used

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  • Wet-type electrocatalytic oxidation method and device

Examples

Experimental program
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Effect test

Embodiment 1

[0041] The wet electrocatalytic oxidation method includes the following steps:

[0042] a. Adjust the output current of the power supply 5 according to the content of organic matter in the wastewater (in this case, it is an ordinary DC power supply);

[0043] b. Turn on the power supply 5, so that the current flows through the electrode 4 and the waste water. The anode generates free radicals in the waste water, and the free radicals initiate the oxidation reaction of oxygen in the waste water and organic matter, which degrades the organic matter and effectively purifies the waste water;

[0044] c. Discharge the purified wastewater from the discharge port of the reaction vessel 1.

[0045] Reaction conditions: pulse frequency is 0 (that is, ordinary DC power supply), duty cycle is 100%, current density is 22.5±2.5A / m -2 , Total pressure 1.0±0.02Mpa, oxygen partial pressure 0.6±0.02Mpa, PH6.0±0.5, temperature 130±1℃, influent salt content 17.2% (calculated as NaCl), influent organic co...

Embodiment 2

[0048] The wet double pulse electrocatalytic oxidation method includes the following steps:

[0049] a. On the basis of the first embodiment, set the power supply 5 as a double pulse power supply;

[0050] b. The dual pulse power supply 5 is turned on, and the pulse current flows through the electrode 4 which is in the shape of a circular tube and is arranged coaxially. The electrode 4 is provided with a hole 11 to increase the free radical distribution space. In fact, this kind of electrode 4 has a smaller volume but a larger surface area, and the holes 11 increase the space, so that the generation of free radicals is more uniform and the diffusion is easier.

[0051] c. Discharge the purified wastewater from the discharge port of the reaction vessel 1.

[0052] Reaction conditions: pulse frequency is 1000Hz, duty ratio is 60%, current density is 22.5±2.5A / m -2 , Total pressure 1.0±0.02Mpa, oxygen partial pressure 0.6±0.02Mpa, PH6±0.5, temperature 130±1℃, influent salt content 17.2% ...

Embodiment 3

[0055] Based on the second embodiment, in step c, the reacted wastewater flows into the separator 6 along the tangentially arranged material-liquid inlet 7 of the inner wall of the separator 6, thereby generating a cyclone to separate the solid, liquid and gas three phases. The solid is discharged from the concentrated residual liquid outlet 10 at the bottom of the separator, the gas is discharged from the gas outlet 8 at the top of the separator 6, and the liquid is discharged from the clear liquid outlet 9 at the upper middle of the separator. In fact, solids include residual liquids with a larger specific gravity. The clear liquid outlet 9 can be connected to the feed inlet of the reaction vessel 1. If the clear liquid still contains toxic organic substances, it can be sent to the reaction vessel 1 for further treatment. The gas outlet can be followed by a condensing device. Because the emitted gas contains a large amount of free radical inhibitor CO 2 And a small amount of...

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Abstract

The invention discloses a wet-type electrocatalytic oxidation method, particularly a wet-type electrocatalytic oxidation method for treating waste water. The invention aims to provide a wet-type electrocatalytic oxidation method capable of relieving electrode polarization. The method comprises the following steps: the periodic commutation pulse current generated by the double-pulse power supply can flow across the electrodes and waste water; each pair of electrodes change the polarity according to the commutation cycle of the pulse current, and the corresponding anode generates free radicals in the waste water, and the free radicals initiates the oxidation reaction between oxygen in the waste water and organic substances; and finally, the waste water after reaction is discharged. The periodic commutation pulse current generated by the double-pulse power supply enables the electrodes to change the polarity periodically, thereby effectively relieving the polarization of electrodes and reducing the electrode corrosion. By utilizing the characteristic of intermittent energization of the pulse current, free radicals generated during energization can have time to diffuse into waste water, thereby enhancing the efficiency of oxidation reaction initiated by free-radicals.

Description

Technical field [0001] The invention relates to an oxidation method, in particular to a wet electrocatalytic oxidation method for treating wastewater. In addition, the present invention also relates to an oxidation device, especially a wet electrocatalytic oxidation device for treating wastewater. Background technique [0002] Due to its stable structure, poor biodegradability, and strong toxicity, high-concentration organic wastewater is difficult to achieve good results with conventional methods. It has been the focus and difficulty of long-term research in the field of water treatment. Currently, two technologies, electrocatalysis and wet oxidation, are commonly used. [0003] Electrocatalysis mainly uses free radicals generated by the electrode (anode) for electrochemical reactions. The energy consumption of electrocatalysis is relatively high, and its energy conversion path is electric energy-free radical-chemical energy, the energy utilization coefficient is small, and the ...

Claims

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Application Information

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IPC IPC(8): C02F1/72C02F1/461
Inventor 张成甫范谦杨维清任杰张飞
Owner GUANGAN LIER CHEM CO LTD
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