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Multi-stage circulation catalytic ozonation reaction device and catalytic oxidation method

A technology of ozone catalytic oxidation and reaction device, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalyst, oxidized water/sewage treatment, etc., can solve the problem of large ozone dosage and gas-water contact area Small size, low ozone mass transfer efficiency and other problems, to achieve the effect of improving utilization efficiency, improving effluent water quality, good economic and environmental benefits

Active Publication Date: 2022-01-11
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are still some challenges in the current heterogeneous ozone catalytic oxidation technology, such as low catalyst activity, small gas-water contact area, large amount of ozone dosing, low ozone mass transfer efficiency, and high cost.

Method used

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  • Multi-stage circulation catalytic ozonation reaction device and catalytic oxidation method
  • Multi-stage circulation catalytic ozonation reaction device and catalytic oxidation method
  • Multi-stage circulation catalytic ozonation reaction device and catalytic oxidation method

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preparation example Construction

[0066] According to yet another specific embodiment of the present invention, the preparation method of the iron-based dual-support catalyst comprises:

[0067] (a) mixing a carbon source, an iron source, an optional nitrogen source, an optional nitrogen and sulfur source, and a solvent (such as deionized water) to form a mixed solution;

[0068] (b) γ-Al 2 o 3 Soaked in the mixed solution, dried;

[0069] (c) performing anaerobic pyrolysis on the dry product obtained in step (b) at 550-800° C. for 3-5 hours, so as to obtain an iron-based dual-carrier catalyst. This step is mainly the process of changing organic carbon into inorganic carbon. Specifically, glucose is used as a carbon source, pyrolytically carbonized at high temperature, and a stable carbon layer is formed on the surface of alumina. During the pyrolysis process, the iron source and heteroatoms (nitrogen or nitrogen-sulfur) will be simultaneously doped into the carbon layer to form active components for cataly...

Embodiment 1

[0083] Based on deionized water, the solvent used to form the immersion solution, glucose (as a carbon source, the mass ratio of glucose to water is 0.125:1), urea (as a nitrogen source, the mass ratio of urea to water is 0.06:1) or sulfur Urea (as a nitrogen and sulfur source, the mass ratio of thiourea to water is 0.06:1), ferric chloride (as an iron source, the mass ratio of ferric chloride to water is 0.035:1) is dissolved in solvent deionized water to form an impregnating solution, γ-Al with a particle size of 3-5mm 2 o 3 As a carrier, the γ-Al 2 o 3 Pellets (γ-Al 2 o 3 The mass ratio of pellets to water is 1.25:1) was immersed in the above solution for several minutes, and then dried in an oven at 80°C for 12 hours. Finally, three iron-based dual-support catalysts were obtained by anaerobic pyrolysis in a tube furnace at 600 °C for 4 h. The first iron-based dual-support catalyst uses gamma-alumina pellets as the core, glucose as the carbon source, and ferric chlori...

Embodiment 2

[0087] The ozone catalytic oxidation process based on the three dual-support catalysts of Fe-CAF, FeN-CAF and FeNS-CAF prepared in Example 1 was used to remove non-biodegradable organic matter in coal chemical industry wastewater, which was obtained from a chemical industry in Inner Mongolia Autonomous Region factory. See the results of COD degradation experiment Figure 9 and Figure 10 . For the adsorption test of three iron-based dual-support catalysts on coal chemical industry wastewater, after 60 minutes of reaction, the COD values ​​of the Fe-CAF, FeN-CAF and FeNS-CAF system effluents were 101, 98 and 91 mg / L, respectively. It can be seen that FeNS-CAF also exhibited the best adsorption capacity for refractory organic pollutants in coal chemical wastewater, which can be attributed to the higher specific surface area as mentioned above. According to the advanced treatment performance of coal chemical wastewater, the single ozonation and ozone catalytic oxidation proces...

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Abstract

The invention discloses a multi-stage circulation catalytic ozonation reaction device and a catalytic oxidation method. The reaction device comprises an oxygen source unit, an ozone generator, a pressure dissolved air tank, and a multi-stage circulation reactor. The multi-stage circulation reactor is internally provided with at least two stages of circulation units, and the outer circulation unit in the at least two stages of circulation units is filled with an ozone catalyst. The multi-stage circulation reactor further comprises a gas-water mixture inlet, a water outlet and a tail gas outlet, and the gas-water mixture inlet is connected with a gas-water mixture outlet. The multi-stage circulation unit is arranged in the multi-stage circulation reactor, so that sewage is subjected to multi-stage catalytic oxidation in the multi-stage circulation unit under the synergistic effect of ozone and an ozone catalyst to generate high-active oxygen substances, gas-liquid-solid three-phase mass transfer is enhanced, and the utilization efficiency of ozone is improved. The advanced sewage treatment performance is enhanced through multi-stage catalysis, the effluent quality of the reaction device is improved, and good economic and environmental benefits are achieved.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a multistage circulation ozone catalytic oxidation reaction device and a catalytic oxidation method. Background technique [0002] The accelerated process of industrialization has resulted in the production of a large amount of industrial wastewater with complex components and various types of pollutants. The effluent from the traditional biochemical stage still contains relatively high concentrations of refractory organic pollutants. Heterogeneous ozone catalytic oxidation technology can catalyze ozone to generate active oxygen species. It is an efficient sewage treatment technology, which can realize the deep reduction of refractory organic pollutants and the deep treatment of industrial wastewater, and promote the resource utilization of sewage. environmental benefits. However, there are still some challenges in the current heterogeneous ozone catalyt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J8/04B01J23/745B01J27/24C02F1/72C02F1/78C02F7/00C02F101/30
CPCB01J8/04C02F1/78C02F1/725C02F7/00B01J27/24B01J23/745C02F2101/30Y02W10/10
Inventor 张潇源任腾飞黄霞
Owner TSINGHUA UNIV
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