Method and device for ozone heterogeneous catalytic oxidation of COD in wastewater

A technology for heterogeneous catalysis and oxidation of wastewater, which is applied in chemical instruments and methods, oxidized water/sewage treatment, molecular sieve catalysts, etc. It can solve the problems of low ozone utilization rate and high operating costs, so as to reduce ozone usage and reduce operating costs , the effect of improving utilization efficiency

Active Publication Date: 2018-01-16
UNIV OF JINAN
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Problems solved by technology

[0005] The purpose of the present invention is: in order to solve the problems of low ozone utilization rate and high operating cost in the ozone catalytic oxidation of wastewater COD, a new solid catalyst is used to catalyze the ozone oxidation treatment of COD in wastewater, and can reduce the amount of ozone in a large amount method and implement

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  • Method and device for ozone heterogeneous catalytic oxidation of COD in wastewater

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Embodiment 1

[0041] A device for ozone heterogeneous catalytic oxidation of COD in wastewater (such as figure 1 As shown), it is specifically a waste water oxidation tower. The interior of the tower body consists of water distribution equipment 4, solid catalyst layer and gas distribution equipment 8 from top to bottom; the top of the tower is provided with a mixed liquid inlet 3, which is connected to the waste water inlet Water pipe 1 and hydrogen peroxide water inlet pipe 2; a mixed gas inlet 9 of ozone and oxygen is provided at the bottom of the tower; an oxygen outlet 10 is provided outside the tower wall of the water distribution device 4, and a water production outlet 11 is provided outside the tower wall of the solid catalyst layer.

[0042] The solid catalyst layer includes catalyst fixed layer 15, catalyst layer 6 and catalyst fixed layer 27 from top to bottom.

[0043] Catalyst fixed layer 1 and catalyst fixed layer 2 use pebbles with a particle size of 2 to 15 mm to fix the sol...

Embodiment 2

[0050] A method for ozone heterogeneous catalytic oxidation of COD in wastewater (using the device of Example 1), the steps are:

[0051](1) Wastewater with a COD concentration of 100 mg / L is sent from the waste water inlet pipe 1, and hydrogen peroxide with a mass concentration of hydrogen peroxide of 27.5% is sent from the water inlet pipe 2, and after mixing, enter the water distribution equipment 4 through the mixed solution inlet 3 and distribute them evenly; The mixed gas of ozone and oxygen enters the lower part of the oxidation tower from the inlet 9 of the mixed gas of ozone and oxygen at the bottom of the tower, and after being evenly distributed by the gas distribution device 8, it enters the solid catalyst layer (catalyst fixed layer 1 5, catalyst layer 6 and catalyst fixed layer 2 7) ; Wherein, the active component of the solid catalyst is aluminum with a mass fraction of 15% and iron with a mass fraction of 12%; the molar ratio of ozone to hydrogen peroxide is con...

Embodiment 3

[0055] A method for ozone heterogeneous catalytic oxidation of COD in wastewater (using the device of Example 1), the steps are:

[0056] (1) Wastewater with a COD concentration of 200 mg / L is passed through the waste water inlet pipe 1, and hydrogen peroxide with a mass concentration of hydrogen peroxide of 27.5% is passed through the water inlet pipe 2, and after mixing, enter the water distribution equipment 4 through the mixed solution inlet 3 and distribute them evenly; The mixed gas of ozone and oxygen enters the lower part of the oxidation tower from the inlet 9 of the mixed gas of ozone and oxygen at the bottom of the tower, and after being evenly distributed by the gas distribution device 8, it enters the solid catalyst layer (catalyst fixed layer 1 5, catalyst layer 6 and catalyst fixed layer 2 7) ; Wherein, the active component of the solid catalyst is aluminum with a mass fraction of 15% and manganese with a mass fraction of 12%; the molar ratio of ozone to hydrogen...

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Abstract

The invention relates to a method and device for ozone heterogeneous catalytic oxidation of COD in wastewater. According to the method, a solid catalyst is used for decomposing ozone into hydroxyl free radicals with stronger oxidability; then an oxidation reaction occurs between the hydroxyl free radicals and organic matters in the wastewater; and the organic matters are converted into carbon dioxide and water, so that the purpose of reducing the COD in the wastewater is achieved. In the method, the mass ratio of the ozone to the COD in the wastewater is (0.5-1):1, the usage amount of the solid catalyst is 0.2-2g/L, and the residence time is 0.1-2 hours. A catalytic oxidation tower for realizing the method is designed, the upper part of the tower is a mixed liquid distribution area of wastewater and hydrogen peroxide; the middle part is a catalyst area; and the lower part is a mixed gas distribution area of oxygen and ozone. The method and device provided by the invention have the advantage of solving the problems that the utilization rate of ozone in ozone catalytic oxidation is low, and the oxidation rate is low.

Description

technical field [0001] The invention belongs to the field of waste water treatment, and relates to a method and a device for heterogeneously catalyzing and oxidizing COD in waste water with ozone, in particular to a method and a device for treating COD in waste water by using a solid catalyst to catalyze the decomposition of ozone into hydroxyl radicals. Background technique [0002] A large amount of industrial wastewater and urban wastewater are produced in the process of human production and life, which contain a large amount of benzene series, organic nitriles and phenols. Such pollutants belong to the pollution indicators strictly controlled by the state. The commonly used removal methods include air flotation, precipitation, adsorption, filtration and biological methods. These methods have limited ability to remove COD and cannot perform advanced treatment. Later, people proposed the oxidation method. There are two types of oxidants in this method. One is ozone. Ozone...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/78B01J29/89
Inventor 张昭良蔡连国李倩辛颖
Owner UNIV OF JINAN
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